Enter the twenty-first century, with foreign PCB apocalyptic, our country enterprise having the PCB industry has a vigorous development. The introduction of advanced technology, the emergence of the high-end product, make our country of PCB both quantity and quality, all have the unprecedented development. At present, our country mainly concentrated in the PCB detection safety certification testing and product quality appraisal two aspects. Safe authentication with mandatory, market access is necessary condition; Quality appraisal is the customer in the performance of recognition. Just IEC standard (GB) is concerned, quality appraisal of project is commonly: visual inspection, size inspection, electrical test, mechanical test, coating inspection, solderability, solvent resistance and flux sex, conductor resistance to current and voltage, frequency drift, etc.
Actually PCB repair and inspection flow is like the following:
Step 1: Ask customer about the appearance when the PCB is broken down.
Step 2: Analyze the reason of breakdown according to customer description;
Step 3: Dissemble device and clean it thoroughly; confirm the components being damaged and then assess the feasibility of can-be REPAIR;
Step 4: Analyze the circuit schematic diagram according to the location of damaged components, find out the root cause of components being damaged and prevent similar situations happen again;
Step 5: ask for customer’s permission to replace the components, get collect comment from customer, starts to repair after receipt of customer confirmation on quote;
Step 6: Repair service include eliminate the existing problems and faults, replace damaged components, clean the entire device thoroughly and required maintenance;
Step 7: Instruct SIMULATIVE LOAD TEST after repairing process finish, once pass the test will send to customer for further on-site testing.
In these requirements,
PCB manufacturer and its inside customer special concern is visual inspection, the structural integrity, cleanness and environmental testing, special requirements, etc, among which the structural integrity, cleanness and electrical test is double, multilayer PCB manufacturer and high density interconnection, its customers the focus of attention. Because the structural integrity is in hot after test, check the gravity of the PCB coating integrity, integrity, laminated coating empty, laminated crack, concave erosion, to drill corrupt, erosion, Kong Huan lining negative concave, connecting dish become warped, coating thickness, minimum/inner copper foil thickness, minimum surface layer thickness, metal core wire, medium thickness, blind holes or buried via resin plug hole, crucify top project, make the PCB”s internal situation be clear at a glance, also be the quality control of the key.
The examination ability, PCB abroad in the United States and Japan is the highest. The United States has led to MICROTEK three professional inspection agencies, not only with a complete testing method, and the analysis of the technology of powerful capability, and like the MOTOROLA such large companies have the complete examination method.
In contrast, China PCB testing technology to weak some. So, how to change this situation? First should improve our country the PCB”s technical content, forced detection technology keep up with the product development. Second, speed up the revision of the standard, increase the PCB project detection technology, raise the threshold. Again, to increase the investment of PCB detection industry, the introduction of advanced equipment, perfect testing means, improve the level of testing. Fourth, increase the detection technology exchange, found and perfect the new testing technology.
