Job performance analysis

Certification method for manufacturing process

7003477

Abstract

An improved method for certifying that a manufacturing facility is capable of producing quality products of a particular type is disclosed. The improved method may comprise auditing the manufacturing facility against a process standard and issuing a certification to the process standard if the manufacturing facility passes the audit. This improved method is particularly suited to manufacturing facilities producing printed circuit assemblies and/or printed circuit boards.


Claims

What I claim is:

1. A method for certifying that a first manufacturing facility is capable of producing quality printed circuit boards or printed circuit board assemblies of a first particular type, said method comprising the steps of:

performing an inspection of at least one second manufacturing facility, wherein said at least one second manufacturing facility is known to produce quality printed circuit boards or printed circuit board assemblies of said first particular type;

preparing a first manufacturing process setup standard based on said inspection;

performing an audit of said first manufacturing facility against said first manufacturing process setup standard; and

issuing a process certification to said first manufacturing facility if said first manufacturing facility passes said audit; wherein said printed circuits or printed circuit assemblies are also of a second particular type and wherein said method further comprises the additional steps of:

performing a second inspection of at least one third manufacturing facility known to produce good printed circuits or printed circuit assemblies of said second particular type;

preparing a second manufacturing process setup standard based on said second inspection of said at least one third manufacturing facility;

performing a second audit on said first manufacturing facility against said second manufacturing process setup standard; and

issuing a second certification to said first manufacturing facility if said first manufacturing facility passes said second audit; and wherein;

said first particular type is through-hole printed circuit boards;

said second particular type is surface mount printed circuit boards; and

at least one of said inspections or audits is carried out at least in part using a temperature measuring device.

2. The method of claim 1 wherein said first manufacturing process setup standard comprises elements, said audit comprises items, each of said items corresponds to at least one of said elements, and wherein said method further comprises the steps of:

making type I recommendations if an item of said audit does not satisfy a corresponding element of said first manufacturing process setup standard;

performing a follow-up audit of said first manufacturing facility to determine if all of said type I recommendations have been implemented; and

issuing a process certification if said follow-up audit confirms that all of said type I recommendations have been implemented.

3. The method of claim 1 wherein said audit is performed within one year of said inspection of said second manufacturing facility known to produce good printed circuits or printed circuit assemblies.

4. The method of claim 1 wherein said printed circuits or printed circuit assemblies belong to a given class of printed circuits or printed circuit assemblies that have a corresponding performance specification and wherein said method comprises the additional steps of:

performing a performance audit of said printed circuits or printed circuit assemblies against said performance specification; and

issuing a product certification if said printed circuits or printed circuit assemblies pass said performance audit.

5. The method of claim 1 wherein said at least one second manufacturing facility known to produce said good printed circuits or printed circuit assemblies comprises three manufacturing facilities known to produce said good printed circuits or printed circuit assemblies.

6. The method of claim 1 wherein said first manufacturing process setup standard comprises the specification of one or more of:

acceptable equipment;

acceptable materials;

ambient temperature;

ambient humidity;

line speed parameters;

operator attitudes; or

plant layout.


Description

TECHNICAL FIELD

This invention relates to an improved method for certifying that a manufacturing facility is capable of producing a quality, manufactured product. It more particularly relates to a method for certifying that a printed circuit board and printed circuit assembly manufacturing facility is capable of producing a quality printed circuit board assembly.

BACKGROUND

There is a long felt need in the manufacturing arts to develop a method for certifying that a given manufacturing facility is capable of producing a quality manufactured part of a particular type. One known means for certifying comprises defining a quality management standard, auditing the manufacturing facility against the standard and then issuing a "certificate of compliance" if the manufacturing facility meets every element of the standard.

An example of a quality management standard is ISO 9000. This is a standard requiring that a quality management program with specific elements be in place. An example of an element of this standard is ISO 9000-2 4.9 This element is summarized by Praxiom Research Limited of Alberta Canada to read in part, "All products (and services) are created by means of processes". (source: "ISO 9000-2 Guidelines Translated into Plain English", http://www.connect.ab.ca/˜praxiom/9000-2.htm) In other words, in order to pass an ISO 9000 audit and receive a certificate of compliance, a manufacturing facility must at least produce all products and services by a predefined process. The standard does not say what the process is or how to determine if the process is suitable for the product being produced. Nor does it give an indication that a process has acceptable yields. It merely states that the process is defined. A certification to a quality management standard, therefore, does not give a third party any indication that the manufacturing facility in question is using appropriate processes for the product being produced.

An alternative method for certifying that a manufacturing facility is capable of producing a quality manufactured product comprises auditing the products produced by a manufacturing facility to a performance specification. The Defense Supply Center, Columbus (DSCC) performs such a certification. The method for attaining the certification is described in "Qualified Products List, Qualified Manufacturers List: General Qualification Information", published by DSCC, September 1998, pp 4-14. A generic test product and associated performance specification are defined for a given class of products, such as hybrid microcircuits. The performance specification for hybrid microcircuits is described in "Hybrid Microcircuits, General Specification for", MIL-PRF-38534E, 6 Jan. 2003. The manufacturing facility then produces a set of the test products. The set of test products are audited or tested against the performance specification. If the parts meet all of the requirements of the performance specification, then the manufacturing facility is issued a certification to produce parts of the general class. The DSCC also additionally requires the manufacturing facility to meet a quality management standard similar to ISO 9000.

A given class of products, however, cannot be audited against a performance specification if the diversity of the members of the class is too great, or the evolution of the members of the class is too rapid. It is not possible in this situation to define a generic test product. Printed circuit assemblies, for example, are a given class of products that are too diverse and are evolving too rapidly for there to be a generic test product. The size of printed circuit assemblies can range from less than 1 mm×1 mm to more than 500 mm×500 mm. Solder joints on printed circuit assemblies can be through-hole, surface mount, and/or area arrays such as BGA or flip-chip. There is a wide array of fluxes, solder pastes, and solder alloys used to produce printed circuit assemblies. The assemblies themselves can range from disposable electronic smart cards to multimillion-dollar mainframe motherboards. Furthermore printed circuit assemblies are evolving rapidly. Solder paste formulations, component lead configurations, component pitch, lead surface metallizations and other physical parameters of the components and assemblies themselves are changing on a yearly and sometimes monthly basis. For reasons of diversity and rapid evolution, therefore, neither the DSCC nor any other entity known to the inventor has been able to define a generic test product for printed circuit assemblies and hence have not been able to certify a manufacturing facility to produce quality printed circuit assemblies to a product standard.

SUMMARY OF INVENTION

This invention is an improved method for certifying that a first manufacturing facility is capable of producing quality products of a particular type. The method comprises the steps of inspecting at least one second manufacturing facility known to produce good parts of said particular type; preparing a manufacturing process standard based on said inspection; auditing said first manufacturing facility against said manufacturing process specification; and issuing a process certification to said first manufacturing facility if said first manufacturing facility passes the audit.

The steps of inspecting at least one second manufacturing facility known to produce good parts at acceptable yields, preparing a manufacturing process standard based on said inspection and auditing a first manufacturing facility against said standard is referred to herein as benchmarking. The results of an inspection of at least one manufacturing facility known to produce good parts is referred to herein as a benchmark. Benchmarks are periodically published for different factories producing good parts of a particular type. The company CEERIS of Old Lyme CT, for example, publishes benchmarks for printed circuit assembly facilities on a periodic basis as evidenced by the press release "CEERIS Releases DPMO Benchmarks" dated Apr. 4, 2000 and incorporated herein by reference. Benchmarks are objective standards as to what good manufacturing processes for parts of a particular type are at a given time. Benchmark studies also establish what the state-of-the art, best-of-breed or best-in-class manufacturing processes are at a given time.

Two products are of the same particular type if they share at least one similar essential characteristic requiring a similar manufacturing process. For example, if two printed circuit assemblies comprise a ball grid array (BGA), then they share the similar essential characteristic of comprising a ball grid array. This essential characteristic requires a similar manufacturing process, such as a BGA rework station and/or BGA inspection system. The two printed circuit assemblies, therefore, are of the same particular type known as "BGA assembly". This is true even if they differ substantially in other characteristics, such as size.

This invention provides the surprising benefit of providing an objective process standard for the manufacturing process for a product of a particular type despite a wide diversity or rapid evolution of the members of a given class of products to which the product belongs or rapid evolution of the equipment and processes that produce the products. The method can be applied to any manufacturing process. It is particularly suited to the processes used to manufacture printed circuit boards or printed circuit board assemblies. These processes can include surface mount soldering, wave soldering, BGA rework and the like.

The invention may also comprise an improved method for certifying that a manufacturing facility is capable of producing quality products of a particular type, said method comprising the steps of performing an audit of the manufacturing processes of said first manufacturing facility against a manufacturing process standard and issuing a process certification to said manufacturing facility if said first manufacturing facility passes the audit.

The invention may also comprise an improved product of a particular type wherein the improved product is produced by a manufacturing facility that has been certified to a process standard for products of said particular type.

The invention may also comprise an improved means of indicating to a third party that a manufacturing facility is capable of producing quality parts of a particular type which comprises the step of publicly displaying a certification of the factory wherein the certification is to a manufacturing process standard for the products of a particular type.

DETAILED DESCRIPTION

The invention is a method of assuring that a contract electronics manufacturer (CEM), Original Equipment Manufacturer (OEM), printed circuit board (PCB) fabricator or printed circuit board assembly (PCBA) assembler can manufacture a quality product. The invention is assurance to a third party that an electronics assembler's assembly process has met objective standards.

The method may comprise a client making an application to a certification entity for a process certification of its manufacturing facility. The certification entity then begins its Process Audit of the manufacturing process to be certified.

Prior to the audit, the certification entity inspects at least one second manufacturing facility known to produce good parts of the same particular type as the client. The at least one second manufacturing facility is preferably state-of-the-art at the time of the inspection. A manufacturing facility may be considered state of the art if its yields are comparable to that of the best of similar facilities that have been evaluated in a benchmark study. Yields from two different facilities may be considered comparable if they are within 50% of each other. The benchmark study was preferably performed within a year of the inspection.

The certification entity prepares a manufacturing process standard based on the inspection of the at least one second manufacturing facility. The standard comprises acceptable values for parameters describing the second manufacturing facility. These values might comprise acceptable equipment, materials, ambient temperature and humidity, line speed parameters, operator attitudes, and plant layout. The standard is preferably written down. The inspection may occur prior to the client's application for certification. The inspection preferably occurs less than a year prior to the audit. Preferably two or more second facilities are inspected. More preferably three or more second facilities are inspected.

A given part may comprise multiple particular types. A single printed circuit assembly, for example, may comprise a BGA component and a through-hole component. The assembly would therefore be of the two particular types known as "BGA assembly" and "through-hole assembly". The manufacturing process standard, therefore, would be based on the inspection of at least one facility producing good BGA assemblies and at least one facility producing good through-hole assemblies. These two facilities may be the same facility. This is preferred when there are interactions between the processes for producing parts of multiple particular types.

Once the process standard is prepared, the client's manufacturing facility is audited. Areas of the assembly process are examined in detail. The examination should include: equipment, assembly processes, materials, documentation, configuration control, incoming inspection procedures, factory control, "design for manufacturing" guidelines, workmanship standards, process control practices, defect data and corrective actions taken, as well as general operations. Personnel, including management, engineering, technicians, operators, and other line personnel may be interviewed. The certification entity may take measurements and analyze various process centers. Process centers should include all equipment used to manufacture a PCB assembly which may include the stencil printer, pick and place machines, reflow ovens, inspection stations and repair systems. Compatibility of process parameters and materials may be evaluated.

Once the audit is complete, the certification entity will either certify that the client's manufacturing processes meets the manufacturing process standard or will suggest corrective action. If corrective action is required, then different levels of recommendations may be proposed. These levels include:

    • Level I—recommendations that will directly and immediately impact the manufacturing process in terms of yield, efficiency or quality of the product.
    • Level II—recommendations that will significantly improve the process but are not as urgent.
    • Level III—recommendations that are directions that the client may wish to eventually pursue.
    • Level IV—recommendations that will improve the safety of the client's personnel.


    • Implementation of Level I recommendations is a requirement for Process Certification. Implementation of Level IV recommendations may also be required if the manufacturing facility is audited against an additional safety standard. The safety standard may be governmental in origin, such as OSHA (Occupational Safety and Health Administration) standards in the US. The safety standard may also be based on a benchmark to similar facilities.

    Implementation of the required recommendations is preferably completed within 6 months after the initial Process Audit. They are more preferably completed within 1 month after the initial Process Audit. After a fixed period of time, the certification entity will return to the facility to re-examine the process and possibly interview people for compliance to the specified recommendations in a Follow-up Audit. The certification entity may also re-examine key areas of the process that were previously covered on the initial Process Audit to assure that they have not degraded. Key areas may include areas of the process that are known to degrade rapidly over the time interval from the initial Process Audit to the Follow-up Audit. In printed circuit board manufacture, key areas can include copper plate, photo engraving and safe practices. In printed circuit assembly, key areas can include pick-and-place machines, stencil printers and reflow ovens. If the process meets the process standard in the follow-up audit, the certification entity will grant a Process Certification.

    During the course of a Process Audit, expertise in critical areas of, for example, electronic assembly may be observed and examined by the certification entity. If the certification entity finds competence in these areas, the Process Certification will carry endorsements for these areas.

    The Process Certification is valid for a fixed period, such as two years, from the date of initial Certification. At that time, a new Process Audit will take place and if the manufacturing process meets the process standard then the certification will be renewed for an additional fixed period, such as two years. If the Process Audit results in Level I recommendations, these will have to be completed and approved prior to certification renewal. The Process Certification may also require that all Level IV recommendations be implemented.

    The process standard may be updated prior to the new Process Audit by performing a new inspection of a facility known to produce good parts.

    By attaining the certification entity's Process Certification, a manufacturer, such as a contract assembler or original equipment manufacturer (OEM), can assert that their manufacturing process has met objective standards. Having the areas of improvement pointed out by the certification entity and implementing them improves the manufacturing process.

    EXAMPLE 1

    The certification entity proposes to review Company A's surface mount technology (SMT) operation for the purpose of benchmarking and recommending improvements/enhancements to the operation that might result in higher yields and more efficient through-put. The certification entity shall perform a comprehensive Process Audit of Company A's surface mount technology (SMT) assembly process. Services performed shall include:
    • The certification entity will tour Company A's production facility.
    • The certification entity will meet with key personnel of Company A to determine perceived process strengths and weaknesses and related concerns.
    • The certification entity will review the process documentation and yield data of Company A including:
      • Design procedures, design, and design for manufacturing (DFM) guidelines
      • Defect analysis data
    • The certification entity will perform an assessment of the SMT assembly and soldering processes including procedures, equipment, production methods, production rates, configuration control and process controls.
    • The certification entity will work with responsible personnel of Company A to diagnose problems observed by Company A and/or the certification entity.
    • Coinciding with the above activities, the certification entity will perform a skill assessment through dialog with and observation of Company A's personnel.
    • The certification entity will meet with the management (and appropriate engineering personnel as designated by management) to discuss findings and recommendations for process improvement including process enhancement, controls, procedures and personnel training. Comparative analysis to state-of-the-art SMT operations of similar volume and PCBA mix shall ensue. The recommendations may include Level I recommendations.
    • An optional written report can be prepared and submitted summarizing the findings and recommendations resulting from the Process Audit. Specific recommendations will be made concurrent with the direction concluded by the certification entity and Company A.


    • The certification entity will supply most of the tools and equipment required for the process audit including temperature and humidity measurement equipment, oven profile data recorder, checklists, etc. Company A will, ideally, have its SMT line and secondary operations such as inspection, repair and thermal test running and available for assessment and documentation accessible.

    In addition to the initial (proposed) Process Audit, Company A can apply for Process Certification. The certification entity shall revisit Company A at a future agreed upon date (within 8 months of the initial audit) for a follow-up audit. If all Level I recommendations cited in the initial audit have been implemented and nothing else has degraded, the certification entity shall certify Company A's SMT assembly process.

    This certification states to present and prospective Company A clients that the processes, materials, equipment and personnel at Company A have been certified by the certification entity to be capable of producing quality printed circuit board (PCB) assemblies. The certification entity will be available to state and discuss this with Company A's clients. Certification is valid for 1.5 years and renewal can be applied for with a follow-on Process Audit.

    The initial Process Audit is estimated to take approximately 1 on-site day and one office day to prepare the report. The certification entity can also be available for an additional day to discuss prospective process and equipment endeavors of Company A as well as any other issues relating to Company A's SMT business.

    EXAMPLE 2

    The certification entity will review Company B's SMT assembly process and recommend specific direction for process performance improvement. The certification entity's comprehensive process review will result in improved SMT assembly techniques and methodologies.

    The certification entity will concentrate on improving company B's assembly process as well as troubleshooting specific problems Company B may be experiencing. The entire review can usually be accomplished within 2-4 days (depending upon the number of lines in the facility) and with minimal disruption to factory personnel and routines. The certification entity's specific knowledge of and experience with most major manufacturers of production equipment and solder pastes gained through its ongoing work in the field assures Company B of accurate and timely information and recommendations.

    Prior to the certification entity's scheduled process review, specific information about company B's assembly process, personnel and facility will be queried including information regarding current process flow, equipment and materials being used, composition and characteristics of the product being used, current defect levels and specific trouble areas currently recognized. This allows preparation that facilitates efficient and expeditious on-site work.

    The process review begins with a meeting with appropriate engineering and production staff including manufacturing, process, quality, design, and management. Each participant presents their specific areas of responsibilities as well as process concerns and problems they may have.

    The certification entity personnel then proceed to make the initial examination of the assembly line(s). Procedures, equipment and materials are observed. This procedure provides additional insight for the certification entity personnel for an interview phase. Quality documentation is also reviewed at this point.

    Participants involved in the initial meeting meet with the certification entity's personnel individually to further discuss their areas of responsibilities. At this juncture, initial observations and problems identified by the certification entity are mentioned and/or discussed in detail. Documentation and process control practices pertaining to the individual's area will also be reviewed.

    Specific areas of the assembly process are examined in detail. At this point, the certification entity may make measurements and analysis at the various process centers including the printer, pick-and-place, reflow, inspection and repair systems. Compatibility of process parameters and materials will be scrutinized. Interviews with line personnel, as deemed appropriate, will also commence.

    Upon completion of the process review, the certification entity will review its findings and compile a presentation for the Process Review Summation Meeting.

    On the morning following the completion of the process review, the certification entity will present its findings in the process review summation meeting with appropriate personnel. It is here that the recommendations for process improvement will be submitted. These will include specific actions to resolve specific problems as well as issues and directions for improvement of quality and cycle time reduction. They may include Level I recommendations.

    Within 1-2 weeks following the process review, the certification entity will submit a written report summarizing the findings and recommendations presented in the process review summation meeting. If desired, a follow-on meeting with corporate management to present the certification entity's findings can also be opted for.

    In addition to the initial process review, the client can apply for the certification entity's process certification. The certification entity shall revisit the client's facility at a future agreed upon date (within 8 months of the initial audit) for a follow-up audit. If all Level I recommendations cited in the initial process review have been implemented and nothing else has degraded, the certification entity shall certify the client's SMT assembly process. This certification states to present and prospective customers of the client that the processes, materials, equipment and personnel have been certified by the certification entity to be capable of producing quality PCB assemblies. The certification entity will be available to state and discuss this with said customers. Certification is valid for 1.5 years and renewal can be applied for with a follow-on process audit.

    EXAMPLE 3

    The certification entity proposes to perform an initial Process Audit at Company C's contract assembly operation for the purpose of benchmarking and recommending improvements/enhancements to the operation that might result in higher yields and more efficient through-put. The certification entity shall perform a comprehensive Process Audit of Company C's SMT and through-hole assembly process.

    In the course of the Process Audit, Company C shall also apply for the certification entity's Process Certification. The certification entity's Process Certification is assurance to present and prospective customers of Company C that the processes, materials, equipment and personnel have been certified by the certification entity to be capable of producing quality PCB assemblies. Upon attaining the certification entity's Process Certification, customers and potential customers can communicate with the certification entity to discuss and confirm Company C's capabilities. Company C will also be attempting to qualify for No-Clean and BGA Endorsements. No-Clean refers to Company C's processes, equipment and materials that are used to produce circuit board assemblies that do not require cleaning.

    Services performed shall include:
    • The certification entity will tour Company C's production facility.
    • The certification entity will meet with key personnel to review process strengths and weaknesses, defect and process related problems and other pertinent concerns.
    • The certification entity will review process documentation and yield data including:
      • Design procedures, design and DFM Guidelines
      • Defect analysis data
      • Workmanship standards
    • The certification entity will perform an assessment of the assembly and soldering processes including procedures, materials, equipment, materials qualification testing, production methods, production rates, and process controls.
    • The certification entity will work with responsible personnel of Company C to diagnose problems observed by Company C and/or the certification entity.
    • Coinciding with the above activities, skill assessment will be undertaken through dialog with and observation of Company C personnel.
    • The certification entity will meet with the Management (and appropriate engineering personnel as designated by Management) in a summary meeting to discuss findings and recommendations for process improvement including process enhancement, controls, procedures and personnel training.
    • A written report will be prepared and submitted summarizing the findings and recommendations resulting from the Process Audit. Specific recommendations will be made.
      • Level I—recommendations that will directly and immediately impact the manufacturing process in terms of yield, efficiency or quality of the product.
      • Level II—recommendations that will significantly improve the process but are not as urgent.
      • Level III—recommendations that are directions that the client may wish to eventually pursue.


    • Fulfillment of Level I recommendations, as disclosed in a follow-up Process Audit (to be conducted within 6 months of the initial Process Audit) will result in Company C's qualifying and attaining the certification entity's Process Certification.

    The certification entity will supply most of the tools and equipment required for the process audit including temperature and humidity measurement equipment, checklists, etc. Company C should provide a profile data recorder and have its defect data and related statistical process control (SPC) data available for examination. Company C will have its PCB assembly and secondary operations running and available for assessment and documentation accessible.
    • The Process Audit is estimated to take approximately 2 (cumulative) on-site days.
    • The Process Audit report is estimated to take approximately 1 office (off-site) day to prepare.
    • The Follow-Up Process Audit, if required, is estimated to take approximately 1 on-site day.


    • EXAMPLE 4

    The certification entity Process Certification is assurance to present and prospective customers of the Certified Contract Electronics Manufacturer (CEM) that the processes, materials, equipment and personnel have been certified by the certification entity to be capable of producing quality PCB assemblies.

    The Process Certification procedure begins with a thorough Process Audit by the certification entity's team of experienced and qualified Process Examiners.

    All areas of the assembly process are examined in detail. The examination includes: all equipment, assembly processes, materials, documentation, configuration control, incoming inspection procedures, factory control, DFM guidelines, workmanship standards, process control practices, defect data and corrective actions taken, as well as general operations. Personnel at all levels—management, engineering, technicians, operators, and other line personnel are randomly interviewed. The certification entity will take measurements and analyze various process centers including the stencil printer, pick-and-place, reflow, inspection and repair systems. Compatibility of process parameters and materials will be scrutinized.

    Once the audit is complete, the certification entity will either certify that the CEM's assembly processes meet the certification criteria or will suggest corrective action. If corrective action is required, three levels of recommendations will be proposed.
    • Level I—recommendations that will directly and immediately impact the manufacturing process in terms of yield, efficiency or quality of the product.
    • Level II—recommendations that will significantly improve the process but are not as urgent.
    • Level III—recommendations that are directions that the client may wish to eventually pursue.


    • Implementation of Level I recommendations is a requirement for the certification entity's Process Certification. These must be completed within 6 months after the initial Process Audit. At that time, the certification entity will return to the facility to re-examine the process for compliance to the specified recommendations. The certification entity will also re-examine key areas of the process (that were previously covered on the initial Process Audit) to assure that nothing has degraded. If the process is up to standards, the certification entity will grant Process Certification.

    The certification entity Process Certification is valid for two years from the date of initial Certification. At that time, a new Process Audit will take place and, assuming all is up to the certification entity's level of standards, certification will be renewed for another two years. If the Process Audit results in Level I recommendations, these will have to be completed and approved prior to Certification renewal.

    During the course of the Process Audit, expertise in critical areas of electronic assembly may be observed and examined by the certification entity. If the certification entity finds competence in these areas, the Process Certification will carry endorsements for these areas. Such Process Endorsements include capability in No-Clean Soldering, Ball Grid Array (BGA), Chip Scale Packages (CSP) and Flip-Chip, Lead-free Soldering, and others.

    The certification entity Process Certification demonstrates to prospective and existing clients that the proper equipment, processes, training, materials and attitudes are in place to competently build their product. The certified company's clients can call the certification entity to discuss their findings and confidence in the certified company's capabilities. While the certification entity cannot guarantee perfect product assembly, they will stand by their findings that everything required to produce a quality product is in place from a capability and control standpoint.

    Many OEMs do not know how nor have the manpower to perform source inspection or certification of a CEM—particularly as it relates to their mix and volume. The certification entity has this expertise and can confidently recommend Certified clients to the OEM and qualify that recommendation. OEMs will be assured that a CEM with the certification entity Process Certification has been thoroughly examined and approved to very high objective standards.

    EXAMPLE 5

    Company E manufactures microwave PCB assemblies. The microwave PCB assemblies produced by Company E belong to both of the particular type called "microwave end-product circuit boards" and of the particular type "SMT assemblies". Microwave end-product circuit boards are a given class of products that have a specific performance specifications. The performance specification is IPC-6108, "Microwave End Product Board Inspection and Test", which is published by the IPC, Chicago Ill. and is incorporated herein by reference. SMT assemblies are a given class of products that do not have a performance specification to the best of the knowledge of the inventor. Company E was located in the state of NY in USA where it must meet the safety standards of NY OSHA (Occupational Safety and Health Administration).

    Company E hired a certification entity to provide certification that the manufacturing facility and products produced conformed to said IPC performance specification, a process standard for microwave end-product circuit boards, a process standard for SMT assemblies, the safety standards of NY OSHA and a benchmark safety standard for other manufacturers of circuit boards and printed circuit board assemblies. The process standards of each particular type were based on a benchmark to a state-of-the-art facility producing the same particular types. One state-of-the-art facility was inspected to produce the standard for microwave end product circuit board manufacturing. This standard is referred to herein as MEP. Three state-of-the-art facilities were inspected within one year prior to the audit to produce the process standard for SMT assemblies manufacturing. This standard is referred to herein as SMTP. The benchmark safety standard was based on said inspections as well. It is referred to herein as STYP.

    Company E's manufacturing facility was audited by the certification entity. The relevant portion of the results are presented in Table 1. The first column states the item of the manufacturing process that was audited. Bold items in the first column are general headings for subsequent items. The second column states what level a recommendation is. Level I, Level II, Level III and Level IV (i.e. safety) levels are noted. A blank cell in the second column means that an item met the particular element of the standards or specifications appropriate for that item. The third column states a recommendation if an item failed to meet an element of the standards or specifications. The third column also contains comments that the auditor felt would be of interest to Company E. A blank cell in the third column means that no observation was made that was worth bring to the attention of Company E. The fourth column states an element of either the specification or standards that the item was audited against. Cells in the fourth column that are blank refer to items for which there was no specification or standard worth noting. In order to pass the audit and receive certification, all Level I and Level IV recommendations had to be implemented.

    TABLE 1
    Recommendation Recommendation/
    Audit Checklist Level Comments
    Process Standards
    MEP, Benchmark Microwave End
    Product Manufacturing Process
    SMTP, Benchmark, SMT
    Assembly Manufacturing Process.
    Product Specifications
    IPC-6018A, Microwave End-
    Product Board Inspection and Test
    Safety Standards
    NY OSHA
    STYP, Benchmark for Microwave
    End Product and SMT audited
    facilities
    Client employees
    interviewed
    Inspection and MEP, SMTP, personnel know and
    Manufacturing Personnel follow manufacturing processes.
    Quality Systems Engineer MEP, SMTP, personnel know and
    follow quality processes.
    Manufacturing Process MEP, SMTP, personnel know
    Engineer, Project manufacturing processes.
    Engineer
    Manufacturing and MEP, SMTP, personnel know
    Engineering Managers manufacturing processes.
    Special
    Problems/Challenges:
    Note: these items summarize
    the meeting with Company
    E's personnel
    Cross divisional MEP, SMTP, There is cross
    communication between divisional communication between
    personnel personnel.
    Level III Measuring Cu thickness per IPC-6018A, 3.6.3.1
    IPC-6018A, 3.6.3.1. How
    you do you verify 20% of
    1/4/ oz Cu?
    Level III Concern about the detail and IPC-6018A, Class 3 requires a
    conformance criteria for great deal of configuration control
    Class 3 (traceability), and an increase in
    inspection and testing. See
    paragraphs IPC-6018A-1.3, 3.4,
    3.5, 3.6, 3.7, 3.8, 3.10, 3.11, 3.12
    Level III Is equipment necessary for MEP, SMTP, No equipment
    Class 3 qualification requirements other than that for
    testing.
    Board Class:
    Class 2 and 3 product both
    processed on the production
    floor
    Procurement- IPC-6018A-1.3.3, 1.4
    Documentation
    Title, number, date of OK MEP, SMTP, Title, number, date
    spec listed on doc of spec listed on doc
    Exceptions noted (if any) OK MEP, SMTP, exceptions are
    noted
    Title, number, date of copy of master drawing is IPC-6018A-1.4
    master dwg listed forwarded to sub contractor,
    rev verified
    Part ID and marking listed OK MEP, SMTP Part ID and marking
    on doc listed on doc
    Delivery info (if OK
    necessary)
    Acceptance level OK MEP, SMTP, Acceptance level
    classifications listed classifications listed
    Inspection requirements inspection requirements are IPC-6018A-1.4
    listed listed on master drawing
    Document approved by OK MEP, SMTP, Document approved
    manager by manager
    General Observations: Well organized and MEP, SMTP, Procurement
    maintained procurement operations are well organized and
    operations. Procurement maintained. Procurement specialist
    specialist well trained and are trained and know job
    obviously knows the job requirements
    requirements
    Pre-production
    Engineering
    Documentation Review Spec sheet and drawing MEP, SMTP, All materials
    supplied by customer or reviewed by project engineer prior
    created by Company E's to release.
    design dept. All materials
    reviewed by project engineer
    prior to release
    Work Instructions Determined by engineering MEP, SMTP, Work instructions
    Available program software. Project determined by engineering
    engineer reviews job, program software. Project
    determines process path and engineer reviews job, determines
    schedules: process path and schedules.
    PDR (pre-design review) MEP, SMTP, Design reviewed
    with customer with customer before finalization
    Design review
    Critical design review
    Manufacturing readiness MEP, SMTP, Review
    review by customer manufacturing readiness with
    customer.
    Models (1st piece) built. This MEP, SMTP, First piece built and
    entire process is among the evaluated in detail.
    best I've seen. Other facilities
    audited in the past do not take
    the time and the attention to
    detail.
    Traveler Review
    contents Company designs and MEP, SMTP, Travelers checked
    travelers are created in-house. against project checklist.
    Each is checked against the
    project checklist and master
    drawing.
    method of configuration Level III Drawings and engineering Note: This is not a violation of
    information are kept in file 6018A, just a concern.
    cabinets (org. by part However, the process traveler
    number) in each inspection requires the operator/inspector to
    area. verify the configuration level of
    Concerned about the document at each process step.
    configuration control of the
    several copies of drawings
    kept on the floor.
    work instructions For pre-production, work MEP, SMTP, Engineering steps
    instructions are viewed are tracked and interfaced with
    through the engineering customer.
    program software. This is an
    excellent method of tracking
    the engineering steps and to
    interface with the customer.
    special notations Made per customer or MEP, SMTP, Notations are
    engineering request. All recorded for future reference.
    notations are kept in the
    engineering software
    program for future reference.
    class noted Yes, in a special field created MEP, SMTP, Class is noted.
    on the traveler. Easy
    recognition by the operator is
    possible due to the color
    coded bags used for each
    traveler - i.e., Red for Class 3.
    spec noted OK MEP, SMTP, Spec is noted.
    std listed OK MEP, SMTP, Standard is listed
    sign-off N/A
    Process IPC-6018A
    Documentation
    document review Once the project has been MEP, SMTP, Process
    reviewed by the project documentation is reviewed by
    engineer, the document is project engineer and participating
    forwarded for an additional departments.
    review by all participating
    departments.
    dimensional check 1st piece is released, built and MEP, SMTP, First piece is
    measurements made released, built and tested.
    noted on traveler OK MEP, SMTP, notation of
    dimensional check made on
    traveler.
    materials review NA at this point
    how listed noted per spec, per order
    noted on traveler OK
    CoC (Certificate of OK MEP, SMTP, CoC is available.
    conformance) Available
    tools noted Yes - drill bits, etc. called out MEP, SMTP, Tools are noted on
    and noted on drawing drawing
    problems noted? OK MEP, SMTP, Problems are noted
    method of feedback Weekly meetings with MEP, SMTP, Customer feedback
    customer. provided for.
    segregation of Job placed in MRB area after MEP, SMTP, parts segregated
    class/rejected products - NCMR is written. Engineer according to class. Rejected parts
    how? notified. are segregated.
    Configuration IPC-6018A
    Control Method
    Test coupon Programmed and located per
    job. Class 3 coupons have
    been designed and are
    included on artwork and drill
    programs.
    Housekeeping OK MEP, SMTP all items are in
    proper storage or in use. No trash
    or discarded items on floor.
    Film and tool review At the time of pre-traveler
    release.
    tooling process (film) Multiline tooling punch
    dimensional inspection At Copper Plate (CP) MEP, SMTP, dimensions are
    checked by calibrated instruments.
    visual inspection for
    defects
    where At CP
    how marked/controlled Defects (scratches, pinholes, MEP, SMTP, defects are marked.
    etc). are marked with tape
    arrow by inspection
    personnel. Engineering
    decides if tool is usable.
    usage noted Level I No. Film should have date of MEP, SMTP, Film must have date
    plot, and usage should be of plot. Usage must be tracked
    tracked similar to tracking similar to tracking system used on
    system used on # of drill hits. # of drill hits.
    Part of configuration control.
    Film ages and is sensitive to
    temperature, humidity and
    handling. Polyester-type
    materials do not exhibit
    historisis (material memory -
    allowing material to return to
    pre-exposure condition) and
    therefore must stored and
    used in controlled conditions.
    how stored In photo department
    temp & humidity 69 F./40% MEP, SMTP, As part of
    configuration control, temp/RH
    must be maintained as consistent
    between process operations -
    photo-plot, image processing,
    lamination, laminate storage
    Housekeeping Level I Walk off mat not changed MEP, SMTP, Walk off mat needs
    and not sticky. to be checked regularly and
    Dust will affect the quality of replaced when no longer "sticky."
    photo tools, lamination and
    performance of microwave
    assemblies.
    Level I Temp/Humidity recorder MEP, SMTP, As part of
    chart held record paper that configuration control, temp/RH
    hadn't been changed in must be maintained as consistent
    several weeks. between process operations -
    (Undetermined length of photo-plot, image processing,
    time) Temp/humidity lamination, laminate storage
    requirements specified in
    materials and operations
    specifications.
    Materials Storage
    Work Instructions Level I Instructions were located MEP, SMTP, Instructions should
    Available high on wall above the be located within easy reach and
    windows. They were out of line of sight of the operator.
    reach, out of eyeshot and
    difficult to reach (no step
    stool or ladder present).
    Std/Spec Available OK MEP, SMTP, standard and spec
    available.
    Housekeeping Level II In general - OK. However, MEP, SMTP all items are in
    care must be taken when proper storage or in use. No trash
    storing laminate to assure that or discarded items on floor.
    edges and corners do not
    overhang the edge of the
    shelving. Current conditions
    constitute a safety hazard.
    Incoming Materials
    Control - Lam.
    CoC On file MEP, SMTP, CoC is on file.
    Receiving Laminate verified for vendor, MEP, SMTP, Received items
    lot number and qty received, verified for vendor, number and
    CoC forwarded to incoming qty received.
    inspection for filing
    Lot verification Match lot number on CoC to MEP, SMTP, Lot number
    Packing Slip matched to packing slip.
    Testing/Verification Level II None, no referee
    measurements made. Suggest
    periodic verification on
    materials received - copper
    thickness, laminate thickness
    and occasional glass
    verification to spec. Referee
    measurements keep vendors
    honest. It's a simple test used
    to verify quality of incoming
    materials.
    Incoming Materials
    Control - preg
    CoC On file MEP, SMTP, CoC is on file.
    Receiving Preg verified for vendor, lot MEP, SMTP, Received items
    number and qty received, verified for vendor, number and
    CoC forwarded to incoming qty received.
    inspection for filing
    Lot verification Match lot number on CoC to MEP SMTP, match lot number on
    Packing Slip Packing slip.
    Testing/Verification Level II None, no referee
    measurements made. Suggest
    periodic verification on
    materials received - copper
    thickness, laminate thickness
    and occasional glass
    verification to spec.
    Storage and control
    Laminate See Housekeeping remarks
    Temp/Humidity Level I None present MEP, SMTP, As part of
    configuration control, temp/RH
    must be maintained as consistent
    between process operations -
    photo-plot, image processing,
    lamination, laminate storage
    Pre-preg
    Temp/Humidity No calibration of refrigerated
    storage
    Shelf Life noted OK
    Housekeeping Level I Walkoff mat needs MEP, SMTP, Walk off mat needs
    regular/daily change. Suggest to be checked regularly and
    adding a W/O rug in addition replaced when no longer "sticky."
    to sticky mat.
    RMR Area See Inspection Audit
    Locked
    Segregated by Lot
    Matl
    Production
    CoC copy available On File MEP, SMTP, CoC is on file.
    Who controls Print Crib
    Housekeeping Good MEP, SMTP all items are in
    proper storage or in use. No trash
    or discarded items on floor.
    Incoming Matls
    Control-chem
    CoC None available
    Receiving Verification of received
    materials against Packing
    List
    Lot verification See above
    Testing/Verification None.
    per
    Storage and Control
    Segregated per OSHA Level IV No segregation of materials NY OSHA
    (NY-OSHA) per OSHA (NY-OSHA)
    regulations. Acids and
    Caustics were randomly
    placed in CP (plating area),
    not organized According to
    safe practices as specified by
    OSHA (NY-OSHA) regs.
    Marked
    container OK NY OSHA
    storage area Yes. All containers were NY OSHA
    placed in hazard liners (a
    good practice especially
    when containers are not
    segregated by acid/base)
    Testing/Verification None
    per
    Housekeeping See CP
    LiFo/FiFo FiFo
    Instruments OK
    Calibration
    method N/A
    verified N/A
    Equipment
    Maint Log On file STYP, maintenance log is kept on
    file.
    PM (Preventative
    Maintenace)
    Safety Practices
    MSDS (Material Safety Level IV All safety data sheets are STYP, MSDS need to be located
    Data Sheets) Available located in print crib and not in each section, especially where
    in the area where they are chemicals are stored and used.
    needed. Strongly suggest that MSDS gives instructions on
    MSDS' be located in the exposure treatment, spill
    production areas where they containment, etc.
    are needed.
    Handling With gloves STYP, MEP, materials to be
    handled with appropriate personal
    protective equipment.
    Misc matls Control N/A
    Order Release
    Traveler Updated OK MEP, SMTP, travelers are
    updated.
    Materials Prep
    Work Instructions Yes, see notes under Work MEP, SMTP, work instructions
    Available Instructions, Materials Store are available.
    Equipment Shear
    Maint Log Filed in maint. Dept. MEP, SMTP, maintenance log is
    on file.
    Safety Practices
    MSDS (Material Safety Level IV No, see above STYP, MSDS need to be located
    Data Sheet) Available in each section
    Handling OK
    Matl Pull
    CoC verified OK
    noted Level III Yes. Company's system of
    control is solid. However,
    you may be gigged on the
    lack of referee testing
    Matl. Prep
    per Traveler
    Housekeeping See notes under
    Housekeeping, Materials Store
    Order Release
    Traveler updated OK MEP, SMTP, travelers are
    updated.
    Drill
    Work Instructions Yes. Location, attached to MEP, SMTP, work instructions
    Available shelving between the drills are available for all equipment.
    and router easily accessible to
    operators.
    Equipment
    Maint Log Filed in Maint. Dept MEP, SMTP, maintenance log is
    on file.
    PM
    Safety Practices
    MSDS Available Level IV In Print Crib STYP, MSDS need to be located
    in each section
    Handling OK
    Configuration control Good crosscheck of N/C tape
    or program to drill callout
    and inspection
    Matl. Prep Good
    per Dwg/traveler
    Tooling check Per operator sheet located at MEP, SMTP, tooling is checked
    each drill station - GOOD per checklist
    checklist
    Set up Checked against instructions MEP, SMTP, tooling set up is
    checked against instructions.
    Operation
    Test pnl OK
    Offset method Use of Multiline or normal
    jobs, checked by x-ray on
    more difficult multilayers.
    Post drill check
    Hole size Not observed
    Location check Level III Good use of drill inspection
    aid. Aids have part number
    and rev noted. Suggest that
    each inspection aid be
    marked with part no. and rev
    in a consistent place
    (markings are randomly
    placed on aid).
    Tools
    Bit Storage Good MEP, bits are stored properly
    Use control By # of hits MEP, use of bits is controlled.
    Re-point No
    Housekeeping Good MEP, SMTP all items are in
    proper storage or in use. No trash
    or discarded items on floor.
    Level I Temperature and humidity MEP, SMTP, As part of
    recorded chart not updated. configuration control, temp/RH
    Chart needs to be changed must be maintained as consistent
    weekly. Temperature & RH = between process operations-
    73.3 F./47.4 RH (referee check, photo-plot, image processing,
    in spec) lamination, laminate storage
    Order Release
    Traveler updated Yes - miscellaneous rework MEP, SMTP, traveler is updated.
    is noted on the traveler.
    Level I One job was passed to the MEP, SMTP, traveler is updated.
    next operation without
    signoff of a process not
    performed. Upon
    questioning, was told that the
    step was not necessary for
    this job. Suggest signoff or
    lining through and initialing
    unnecessary operations.
    Deburr
    Work Instructions OK MEP, SMTP, World instructions
    Available are available.
    Equipment
    Maint Log In Maint. Dept MEP, SMTP, maintenance log is
    on file
    PM
    Safety Practices
    MSDS Available Level IV See above STYP, MSDS need to be located
    in each section, especially where
    chemicals are stored and used.
    MSDS gives instructions on
    exposure treatment, spill
    containment, etc.
    Wet Process - CP
    Work Instructions OK MEP, SMTP, Work instructions
    Available are available.
    Equipment
    Maint Log See above MEP, SMTP, maintenance log is
    on file
    PM
    Safety Practices Level IV Drum storage blocks NY OSHA
    eyewash and shower in etch
    and debur. Violation of
    OSHA (NY-OSHA) req. No
    evidence of regular testing of
    eyewash or shower - OSHA
    (NY-OSHA) Req.
    MSDS Available Level IV See above STYP, MSDS need to be located
    in each section, especially where
    chemicals are stored and used.
    MSDS gives instructions on
    exposure treatment, spill
    containment, etc.
    Chem testing
    Frequency Level II On required items. Chem
    titration setup in exhibited
    dried crystalline (2 tubes)
    structures on titration tube. If
    these crystals fall into beaker
    during test - results will be
    compromised. Suggest
    regular cleaning with D.I.
    water to assure good results.
    Cleanliness - wet
    operations
    Housekeeping Level I Very Poor - see notes on MEP, SMTP all items are in
    housekeeping proper storage or in use. No trash
    or discarded items on floor.
    Racks OK
    Anode/cathode Level I All cathodes showed regular MEP, SMTP Anodes and cathodes
    cleaning. However, there re cleaned and checked regularly.
    does not appear to regular
    checks or replacement of
    anodes as evidenced by the
    poor condition of recently
    removed lead anodes.
    Evidence of this should be
    apparent through
    microsection (IPC-6018A-
    3.7) evaluation.
    Level II There must be a regular MEP,SMTP Anodes and cathodes
    schedule initiated with re cleaned and checked regularly.
    verification of checks and
    replacement logged.
    Tanks Level II Acceptable. Suggest regular MEP, SMTP Tanks are cleaned
    wiping (daily) of tank faces and checked regularly.
    and tops.
    Thickness check
    Cu By operator MEP, SMTP, all required
    thickness checks are performed.
    PbSn CoC available from outside MEP, SMTP, all required
    testing lab. thickness checks are performed.
    Sn CoC available from outside MEP, SMTP, all required
    testing lab. thickness checks are performed.
    Other Ni/Au thickness noted by the MEP, SMTP, all required
    operator on all jobs requiring. thickness checks are performed.
    Calibration MEP, SMTP, All measuring
    equipment is within calibration
    Rectification Within Calibration
    Other
    Housekeeping Level I 1. Poor in etch. OK in plate. MEP, SMTP all items are in
    proper storage or in use. No trash
    or discarded items on floor.
    Level I 2. Drums randomly placed in MEP, SMTP all items are in
    area. No segregation by type. proper storage or in use. No trash
    or discarded items on floor.
    Level I 3. Drums block access to MEP, SMTP all items are in
    equipment and work tables proper storage or in use. No trash
    or discarded items on floor.
    Level I 4. Old Somaca deburrer MEP, SMTP all items are in
    stored in area. proper storage or in use. No trash
    or discarded items on floor.
    Traveler Updated OK MEP, SMTP, all travelers are
    updated.
    Micro Etch - CP
    Work Instructions OK MEP, SMTP, all work
    Available instructions are visible
    Equipment
    Maintenance Log See above MEP, SMTP, all maintenance
    logs are available
    PM MEP, SMTP, PM is done
    according to plan
    Safety Practices Level IV Electrical panels blocked, DI NY OSHA
    cylinder not strapped to wall
    per OSHA (NY-OSHA) req.
    MSDS Available Level IV See above STYP, all MSDSs are available
    Chem testing
    Frequency Level II On required items. Chem
    titration setup in microetch
    exhibited dried crystalline
    structures on titration tube. If
    these crystals fall into beaker
    during test - results will be
    compromised. Suggest
    regular cleaning with D.I.
    water to assure good results.
    Level II No analysis log. Results not
    noted or tracked.
    Cleanliness Level I Poor. Etcher was covered MEP, SMTP all items are in
    with died etchant, floor proper storage or in use. No trash
    needed cleaning or discarded items on floor.
    Etch setup OK
    Etch control OK. See note concerning
    chem testing.
    Housekeeping Level I 1. In general - very poor. MEP, SMTP all items are in
    proper storage or in use. No trash
    or discarded items on floor.
    Level I 2. All electrical panels MEP, SMTP all items are in
    blocked by tables, equipment proper storage or in use. No trash
    or carts or discarded items on floor.
    Level I 3. Misc. waste materials MEP, SMTP all items are in
    stored In MRB area. proper storage or in use. No trash
    or discarded items on floor.
    Level 1 4. DI cylinder (tank) stored at MEP, SMTP all items are in
    end of etcher, not strapped proper storage or in use. No trash
    per OSHA (NY-OSHA) req. or discarded items on floor.
    Level I 5. Jobs stacked on chem MEP, SMTP all items are in
    drums stored in area (not in proper storage or in use. No trash
    rack) or discarded items on floor.
    Traveler Update OK MEP, SMTP, travelers are
    updated
    Photo
    Work Instructions OK MEP, SMTP, all work
    Available instructions are available
    Equipment See above
    Maint Log MEP, SMTP, maintenance log is
    available
    PM MEP, SMTP, PM is done
    according to plan
    MSDS Available Level I See above STYP, MSDS need to be located
    in each section, especially where
    chemicals are stored and used.
    MSDS gives instructions on
    exposure treatment, spill
    containment, etc.
    Photo Tool
    Control Controlled by operator
    Use control Print operator responsible for
    artwork quality
    Setup Multiline tooling used
    Test Sample 1st article inspection on each
    new order
    Develop
    Chem control Level I no calibration on auto MEP, SMTP, All measurements
    analyzer are made by calibrated
    instruments.
    Temp/Humidity 72.3 F./51% RH MEP, SMTP, temperature and
    humidity are controlled within
    limits and recorded.
    Housekeeping Level I 1. Walkoff mat needs MEP, SMTP, Walk off mat needs
    frequent changing. Mat in use to be checked regularly and
    was so dirty that no dust was replaced when no longer "sticky."
    removed from shoes.
    Level II 2. Dust and resist flakes were MEP, SMTP all items are in
    noticed on shelf under proper storage or in use. No trash
    printing table or discarded items on floor.
    Level I 3. No calibration on thermal MEP, SMTP all measurements
    roller controls on resist are made by calibrated
    laminator instruments.
    Traveler Update MEP, SMTP, travelers are
    updated.
    Lamination
    Work Instructions OK MEP, SMTP, work instructions
    Available are available
    Equipment
    Maint Log See above MEP, SMTP, maintenance log is
    available.
    PM MEP, SMTP, PM is done
    according to plan.
    Calibrate Level I No calibration of refrigerated MEP, SMTP, temperature of all
    storage storage units is controlled and
    calibrated.
    All Presses within calibration MEP, SMTP, all presses are
    calibrated.
    Safety Practices
    MSDS Available Level IV See above STYP, MSDS need to be located
    in each section, especially where
    chemicals are stored and used.
    MSDS gives instructions on
    exposure treatment, spill
    containment, etc.
    Tool
    Control Excellent
    Use control Excellent
    Setup
    Book method Very well organized and
    layed out
    Material Pull Excellent
    Matl Storage Neatly stored
    Release sheet
    re-use good work habit
    CoC verified OK - all preg stored in MEP, SMTP, CoC is verified.
    refrigerator was marked with
    expiration date and lot
    number.
    Temp/Humidity Level I Temp and humidity chart MEP, SMTP, temp and humidity
    recorder present but not in controlled to within limits and
    use. recorded.
    Handling Good
    Housekeeping Level I 1. Walkoff mat needs MEP, SMTP, Walk off mat needs
    frequent changing. Mat in use to be checked regularly and
    was so dirty that no dust was replaced when no longer "sticky."
    removed from shoes. Suggest
    the addition of a walkoff rug.
    Traveler Update OK MEP, SMTP, travelers are
    updated.
    Inspection
    Work Instructions Level I No, Class 3 will necessitate MEP, SMTP, work instructions
    Available work instruction update to are available.
    reflect additional process
    inspections and tests.
    Tools Available
    Pins Level II In Final/Incoming - pins are MEP, SMTP, pins are properly
    stored safely in a file drawer stored according to size.
    and pin organizer. However,
    pin gauges are not checked
    prior to use. Recommend
    using a micrometer to check
    each pin before use.
    Mics In Calibration MEP, SMTP, Mics are within
    calibration
    Calip In Calibration MEP, SMTP, calipers are within
    calibration.
    Loupe N/A
    Scale OK MEP, SMTP, scale is within
    calibration
    Magnification Level I 3-4 Diopter ring lamps in use. Spec 6018A requires 7 to 30X
    Other N/A
    Thickness
    Measurements
    Method XRF
    Equipment
    Calibrated XRF sources are used for MEP, SMTP, XRF sources are
    calibration and were within within calibration
    calibration.
    Level I Must remove expired MEP, SMTP, equipment
    calibration sticker from XRF calibration is current.
    machine.
    Used for PbSn thickness
    measurements
    Verification
    Dimensional
    hole size pinned MEP, SMTP, dimensions
    measured with calibrated
    instruments.
    overall micrometers, calipers MEP, SMTP, dimensions
    measured with calibrated
    instruments
    thickness XRF MEP, SMTP, dimensions
    measured with calibrated
    instruments
    circuit line coordinate measuring MEP, SMTP, dimensions
    machine measured with calibrated
    instruments
    circuit space same MEP, SMTP, dimensions
    measured with calibrated
    instruments
    edge visual
    all critical dim verified Level II inspection observed in Final IPC-6018A-3.5,
    did not check all critical
    dimensions noted on the
    dwg. Operator said
    engineering did not require
    the dimension to be
    measured - dwg was not
    updated (magnet)
    warp & twist Level III No warp and twist IPC-6018A-3.5.4
    measurements made
    final features visual
    Cu thickness Level I CoC from Outside Vendor MEP, SMTP, Referee
    used, no referee measurements are used to confirm
    measurements made certificates of compliance.
    front-to-back coordinate measuring MEP, SMTP, dimensions
    machine measured with calibrated
    instruments
    other
    Surface Finish
    thickness verification Level I At final only. Should be MEP Thickness checked in CP.
    checked in CP, referee
    measurements should be
    made on all OV parts
    surface OK
    hole Level I No Cu thickness IPC-6018A- 3.5, 3.5.1-3.5.3
    measurements made at
    microsection - req by 6018A
    visual Colored tape notes defects on MEP, SMTP, defects on dwg
    dwg and starts an NCMR noted. NCMR initiated.
    (non conforming material
    review). Some defects are
    passed on to the next
    operation and then reviewed
    on return. NCMR is voided if
    parts comply. This is a good
    systems with adequate checks
    and balances
    plating adhesion test OK MEP, SMTP, dimensions
    measured with calibrated
    instruments
    method Std. tape test
    Physical Tests of
    Final Products
    Microsection - note: all Level I To conform to 6018A these IPC-6018A-3.5.2, 3.7, 3.7.2
    requirements can be tests must be performed in IPC-TM-650-2.0, et al.
    waived by customer. Must accordance with the
    have documentation on appropriate specification
    file. unless otherwise specified by
    your customer. If customer
    waives testing, ITM suggests
    occasional referee testing.
    coupon taken
    solderability Level I J-Std-003 - this is an Ref. IPC-TM-650
    important test. The results
    can indicate a problem in CP,
    with cleanliness and with
    your Outside Vendor
    solder float Level I Thermal shock required IPC-TM-650, 2.6.7.2
    (6018A-3.12)
    thermal stress per Level I Thermal stress required IPC-TM-650, 2.6.8
    (6018A-3.12)
    lap shear Level I Required (6018A-3.7.2.17) IPC 6018A-3.7.2.17
    cleanliness One of the cleanest and best MEP, SMTP, all items in proper
    organized departments storage or in use. No discarded
    audited items on floor.
    Handling OK
    Housekeeping Excellent MEP, SMTP, all items in proper
    storage or in use. No discarded
    items on floor.
    Traveler Update N/A
    Test
    Work Instructions All electrical testing is
    Available subcontracted
    Test Method Level I These and other test are IPC 6018A
    required by 6018A, unless
    otherwise specified by the
    customer.
    Surface Insulation Level I Required IPC-TM-650, 2.6.3 (ref Table 3-
    Resistance 16 in 6018A)
    Coupon
    Board
    Moisture Insulation Level I Required IPC-TM-650, 2.6.3 (ref Table 3-
    Resistance 16 in 6018A)
    Coupon
    Board
    TDR Level I Required IPC-TM-650, 2.5.5.7
    Coupon
    Board
    Open/short Level I Required IPC-6018, 3.10.3
    Handling N/A
    Housekeeping N/A
    Traveler Update N/A
    Shipping
    CoC included With all jobs, plus a copy of MEP, SMTP, CoC included in all
    the purchase order jobs.
    Desiccant if required MEP, SMTP, desiccant included
    in package if required by product.
    Single/stacked OK
    Clean/dry OK
    Handling OK
    Housekeeping Level IV Head hazard under stairs. S/B OSHA (NY-OSHA) (NY-OSHA
    marked with black/yellow (NY-OSHA))
    striped tape foam.
    Traveler Update OK MEP, SMTP, all travelers are
    updated.


    The results of the process audit were presented to the personnel of Company E. The manufacturing facility of Company E was re-audited within one month of the initial audit. All Level I and Level IV recommendations were implemented by the second audit and no other items had deteriorated. The certification entity issued a certification to the product specifications, process standards and safety standards for the manufacturing facility.

    The certification is valid for 1.5 years and could be renewed with a follow-up process audit. The certification entity has made itself available to Company E's current and future clients to discuss and verify the certification. The certification entity also transmitted an electronic copy of the certification to Company E. Company E posted said certification on their web site. The certification entity granted the right to use its logo to Company E for the purpose of authenticating the certification to third parties. The paper copy of the certification was personally signed by the managing member of the certification entity and sent to Company E. The paper copy also contained identification of Company E, their location, identification of the certification entity, their logo, an issue date, and expiration date and a statement of the standards and specifications to which the certification pertained. The electronic copy of the certification contained the same elements.

    Having thus described the invention with particular reference to the embodiments thereof, it will be obvious that various changes and modifications can be made therein without departing from the spirit and scope of the present invention as defined in the appended claims.

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    Electronic shipment planner System for determining the health of process control feedback loops according to performance assessment criteria