APW8 Power Supply Maintenance Guide
1
Instructions for Power Supply Maintenance
Version date:
2010.7.23
File Category:
Maintenance
Guide
Content of this Volume:
It mainly describes the troubleshooting of various faults of the power
supply APW8, and how to use the test tool for accurate positioning.
※
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reprinted, extracted or used in
any other ways with the permission of the copyright owner. Please contact Bitmain official customer service if
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I.
Requirements on the Maintenance Platform
1.
The constant temperature soldering iron above 80W (soldering temperature: 300-350°C). The tip
soldering iron head is used for soldering chip resistors and capacitors. The blade type soldering iron
head is used for soldering and replacement of plug-in components (soldering temperature: 380-
420°C)
2.
The thermal chimney is used for chip disassembly and soldering, be careful not to heat for a long
time to avoid PCB foaming (soldering temperature: 260°C ±2 °C).
3.
The AC controllable power supply voltage regulator (output 200-250V, can limit 0-20A current)
is used for APW8 power-on inspection. If there is no such condition, a 100W ordinary light bulb
can also be strung on the AC fire line with mains. Be careful.
4.
For electronic load (power 2KW, meet the voltage 0-50V), if there is no such condition, a
resistive load that matches the APW8 can also be made.
5.
The multimeter, suction gun, tweezers, V9-1.2 test jig and special power test card firmware (if
there is condition, an oscilloscope can be configured).
6.
Flux, lead-free tin wire, water for cleaning panel with anhydrous alcohol; water for cleaning
panel is used to clean flux residue and appearance after maintenance.
7.
Thermally conductive silicone grease (2500) is used to repair the thermal conduction between the
MOS and the cooling fin, thermal conductive silicone (704 silica gel) is used for fixing and
covering the glue damage at the original after the repair of the PCBA components
II.
Requirements on Maintenance Operations
1. The maintenance personnel must have certain electronic knowledge, more than one year of
maintenance experience, and a certain understanding of the working principle of switching power
supply, and well master the soldering technology.
