PCB production process often encountered due to human operation errors, resulting in quality problems leaked to the customer caused by customer dissatisfaction and complaints, such as the appearance of defects, the wrong label, the number of shortages, leakage processing steps, wrong hair and other issues. For these questions, how to carry out analysis of rectification? Customers do not like us to write 'operational errors, personnel training, quality awareness to enhance' and other corrective measures, but how can write it? Can not always be on the wrong?

In fact, not only your customers do not like this rectification measures, your leadership must not like to move at every turn to write "operator awareness of quality is not strong, strengthen training", "punishment of 300 people" and so on these can not be converted into specific action program And the assessment criteria for the improvement of false and large air. The responsibility of the quality problems to the operator, or is irresponsible to deal with, or is not understand the quality of management. Because as long as the human operation to avoid mistakes, as the administrator should think about how to detect and fundamentally prevent these mistakes.

First talk about the appearance of defects.

In general, the appearance of defects are required to 100 percent visual inspection, and indeed likely to cause missed inspection situation. But still can be from the following aspects to find the reasons and to develop improvement measures.

- whether the specific inspection standards are clear, whether it is consistent with the customer. Some corporate appearance standards simply write "no burr, no rubbing". But in the field operation, the operator and production management and that PCB "no rubbing is impossible", and thus in accordance with their own understanding to master a vague standard. The standard practice is to use the PCB according to the functional surface, one by one according to the possible defects to determine the acceptable standards and unacceptable standards, such as the length and width of the wipe. And then described in the form of illustrations clearly. The standard should be clear, understandable, unambiguous, and practicable. Eliminate the fuzzy "appearance criteria see limit model". If there is a limited model, but also a text description, which limit which model which defective model, is a defective model or qualified model, defect and qualified to determine what conditions, must be clear.

- whether the standard has been clearly and clearly communicated to the staff. Put an end to the general training that is not in place, but only on the matter in the training of this defect, and the same thing next time in another station on another issue and may be repeated. If the staff training aspects of rectification, must from the training methods, training processes, training after the assessment methods, the new staff early post and the prosecutor in charge of the point of view, in the working methods and process system to find the reasons to be rectified to put an end to the next Similar things happen. For example, in view of the appearance of the defect training, in addition to the new staff to explain the appearance of standards or work instructions, but also should be combined with a large number of defective physical samples for training, so that new staff to do some defect judgment exercises. In the early days of the staff, in the standard boundaries near the PCB to the competent or quality department staff to help determine. To establish a critical job management and staff training system, to prevent temporary training of new employees hastily induction.

- whether the job planning is reasonable. For example, is it necessary to have the light intensity of the light source of the station where the inspection is required? Appearance check the height of the work desk is appropriate PCB flip and operation observation? Employee appearance test PCB order is planned and cured? In other words, employees check PCB appearance, the eyes to see which a few faces which points, according to what order check, such as to check the PCB line, ink, hole these aspects, then according to the first hole, then Look at the ink, and finally check the order of the line, so that there will be no staff because of the order of inspection and lead to missing a problem point of the situation there, there are PCB flip order and the eyes of the walking path is fixed? Does the appearance inspection and production operations be completed within the limited tempo?

- often appear appearance defects whether posted a quality warning card to remind employees to pay special attention?

- last, and most importantly, whether to find the cause at the source, committed to reducing and eliminating the appearance of defects? For example, for the problem of cleaning, storage and transport of PCB tools with or without the possibility of cleaning products? Is there a collision between PCBs? Is PCB turnover reasonable? Is there a board stack? Staff operation process, the product placed in the process of existence of the risk of rubbing? There is no standard in the operation of the staff handling movement.

The second question, the label is wrong.

Label paste in many OEM customers, but also a very serious problem. In some customers where the label if the wrong two times may directly lead to controlled shipment. Tag error can be considered from the following aspects of improvement.

- The product enters the workshop with the process card. In the circuit board mill, often the process card and the board is not synchronized with the phenomenon, when the board into the packaging process, the process card may not yet, employees remember the label with memory, so it is easy to confuse the board model, wrong The problem with the label appears.

The third question, the number of shortages.

The thickness of the PCB is generally 0.4-2.0mm, because the board is very thin, so when less than one or two tablets per board, it is difficult to detect.

- weighing method. PCB shape is extremely regular, the weight of each board is almost equal, so the same number of board weight are the same, so you can first determine the standard number of each package, the back of the board after the number of points, and then re-weighing again.

The fourth question, leak processing.

PCB production can not be done as other electronic products assembled as a continuous production line to prevent leakage processing, it can only rely on the way to control the way to prevent the wrong card:

- use ERP system or a number of process cards signed to confirm the way to prevent leakage processing. Useful PCBERP enterprises are through the system, the board in which process, the system will show the state of the board in which process, the next step in the process of receiving the board will confirm whether the process has completed the production and processing, if not completed, It will not receive, the board can not go to the next process, so the correct use of PCBERP enterprises will not leak processing problems.

PCBERP companies do not need to use the process card to control, the same process under the PCB from the process to check whether the completion of processing production, confirmed after the completion of the signature on the card to prevent leakage processing problems.

The fifth question, with the wrong material.

The most common is to use the wrong ink color, such as PCB commonly used ink color is green, and when some special board requires dark green, the staff may be based on thinking inertia or not carefully look at the operation requirements, still use the ordinary green.

- Special requirements are required to remind employees to pay attention to the areas where there are special requirements, process cards with a variety of ways to increase the font or eye-catching colors. At the same time require the process card to follow the board to go, if there is no process card, the staff can not accept the process of the board to prevent employees do not look at the process card and according to the inertia of thinking to do the board, resulting in production errors.