Production model: 4K1601B0
Product use: smart watch
Pcb sheet information: 132.3*130.5MM/9PCS four-layer FR4, sheet thickness 1.0MM, copper thickness 10Z, immersion gold, black oil white, three-level standard;
Smt points: 156
Dip points: 3
Process flow: smt+burning+test+assembly
Smt welding precautions: 1 gold finger to paste high temperature glue protection
2.U5 number is easy to be biased, it is best to fix it with red glue.
3 If it is repaired, it must be thoroughly cleaned (because the final product is bare board)
4 pay attention to monitor the OFN bit number as shown in the figure, it is easier to short circuit
Solder paste requirements: Sn99/Ag0.3/Cu0.7/20 -38
Reflow soldering setting: Pay attention to whether there is a hard feeling and inflexibility after the button is over the furnace.
1 test voltage
3 functional test
4 download software (refer to the accompanying SOP)
Product packaging: universal carton.
1 Our company has another order for color box packaging, and the finished product inventory can be.
Be careful when 2 points, the edge of the product is more fragile. At the same time, the burrs of the sub-board should be scraped off.