1. PCB boards with BGA and 0402/0201/01005 must have a 5mm wide process edge and mark points. If there is no process edge, solder pads within 4mm from the board edge cannot be printed with solder paste and patches; If there are no mark points, as the equipment is located by machine vision recognition of mark points, the equipment cannot accurately locate, and the printing and mounting accuracy cannot be guaranteed.

1.1. Due to the lack of PCB edges this time, our company can only use adhesive tape to remove the solder pads within 4mm of the board edge, without printing or pasting parts, and finally use manual repair welding. Risk: Manual repair welding of 0201 components is definitely not as reliable as equipment installation welding.

1.2. Due to the lack of mark points on the PCB this time, our company can only replace the mark points with TP points or pads. Due to the differences between TP points and pads, there are risks: insufficient placement accuracy, BGA offset short circuit, and 0201 part offset. We can only rely on engineers to closely monitor online and maximize accuracy through manual means.

2. For all SMT boards, the SMT factory must organize the equipment processing program and first article inspection drawings based on the information provided by the customer. The more complete the information provided by the customer, the shorter the preparation time for the factory, the faster the delivery time, and the more guaranteed the quality. Please refer to the top SMT research institute article for the complete set of information:

http://www.qualitysmt.com/newsinfo/1946995.html

The tag number diagram provided by the customer this time only has tag numbers and no specifications, and cannot be directly used for first article inspection. Our company needs to manually fill in the specifications of each part on the tag number diagram, which is expected to take at least 24 working hours. Considering the customer's delivery time, this step is omitted and production is carried out by strengthening the verification of the tag number table.

(The left figure below is the work that our company needs to manually add based on the tag number map provided by your company; the right figure is the complete tag number map provided by other customers.)

3. SMT samples and resistance capacitance sensing components are strongly requested to be provided in reels. The remaining materials used after our company's production can be returned in reels or inventory data can be provided to your company. The issues and risks arising from the partial capacitance provided by your company this time include:

3.1. Due to the lack of disk packaging and clear identification labels, there are generally only brief handwritten specifications, which are prone to errors in counting and loading;

3.2. The loading time of the production line equipment for cut and cut materials is three times that of plate loading. It is expected that 3 people for 150 types of plate loading materials will need 4 hours to load, and 3 people for 150 types of cut and cut materials will need 12 hours to load.

3.3. When loading, a 5cm long material head is required, and all the material in the material head will be lost, resulting in a shortage of materials in the last few boards and inability to ship. Additionally, manual welding can only be carried out after the supplementary materials are returned. If the quality and delivery time are affected by missing a few cents of resistive materials, it is actually very uneconomical.