CONTRACT MANUFACTURI NG board tested are kept on file. 4. C 4. CONVENTIONAL ASSEMBLY
SMT assembled boards and a PTH kit of parts come together at this stage. The SMT boards are visually inspected by the quality assurance team before any PTH assembly commences. Operators refer to the ‘Manufacturing Job Pack’ for instructions on which component to fit where on the board. Each job pack is specific to a product type and will accompany the job throughout the entire manufacturing and test process. Boards are soldered using CSL’s two stage selective solder system. The quality of the solder joints are far superior to the older wave solder equipment or hand solder process and allow soldering on all double sided assembly boards with ease.
In general, the PTH component count is far less than the SMT component count and so can be inspected
adequately by visual methods using high magnification equipment. Each individual board is manually inspected after soldering.
5. TEST
Many of Circuit Solutions customers require the assembled PCBs to be tested
and t hen assembled into the final product . Test is normally carried out using a functional test program that includes a dummyincludes a dummy unit or t est fixture supplied by the cust omer or built to their specification. This is an important part of t he manufacturing cycle as it allows Circuit Solutions t o verify that t he assembly performs elect ronically to the customer’s specification and is the ultimate verification t hat all our processes are correct.
Photo 2: AOI inspection 6. BOX BUILD
This is the final part of the manufacture process and includes assembling the PCB t o any mechanical parts. Final product inspect ion will include checking t he assembly is to t he customers drawings, any labels are fitt ed, serial numbers recorded, scratches or damage, etc and that all the manufacturing inspect ion sign off’s have been completed.
SUMMARY
Circuit Solutions qualit y objectives includes improving manufacturing quality. Inspection at all stages has had a proven posit ive impact on t hese objectives. Improving manufacturing quality is monit ored in the production inspection KP I 1st time pass rate. This
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FEAT
ATURE
KPI includes inspection at the following stages – AOI, Post AOI, PT H and Test. The objective is to achieve t he 1st time average pass rate of >98 per cent. As an example for SMT assembly, Circuit Solutions identify all the fault ty pes, analy se and continuously incorporate ongoing preventative actions.
Circuit Solutions
www.circuitsolutions.co.uk sales@sknelectronics.co.uk
/ ELECTRONICS
ELECTRONICS
| MAY 2020
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