APW12 Power Supply Maintenance Guide
Version date: 2020.4.16
Contents: Mainly describes how to troubleshoot various faults of the power supply APW12 and how to use test
tools for accurate troubleshooting.
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I. Requirements for Maintenance Platform
1. Constant temperature soldering iron, above 80W (soldering temperature is 300-350°C), pointed soldering iron tip
is used to solder small patches such as resistors and capacitors, etc., knife-type soldering iron tip is used for
replacing plug-in component by welding (welding temperature is 380-420 °C).
2. The heat gun is used for chip disassembly and soldering. Be careful not to heat it for a long time to avoid PCB
blistering (welding temperature is 260 °C±2 °C).
3. AC controllable power supply voltage regulator (output 200-250V, limit current 0-20A) is used for APW12
power-on inspection. If it's not available, operator can also connect a 100W ordinary light bulb to the utility AC
live wire, but shall pay attention to safety.
4. Electronic load (power 3.6KW, suitable voltage 0-50V); if it's not available, operator can make a power
resistance load matching APW12.
5. Multimeter, suction pistol, tweezers, zj0001000001 or V9 1.2 hashboard testers and special power supply test
card firmware (configure an oscilloscope if available).
6. Flux, lead-free solder wire, water for cleaning panel with anhydrous alcohol; water for cleaning panel is used to
clean up the residue and appearance of the flux after maintenance
7. Thermally conductive silicone grease (2500) is used to repair the heat conduction between the MOS and the heat
sinks. The thermally conductive silicone (704 silicone) is used to fix the cover after the original glue of the PCBA
component is damaged after repair.
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