ST3 6-10kVA Service Manual Rev.1
Allis Electric Page 7 of total 12 September 2006
3. Troubleshooting
3.4 Inverter Analysis
6/10kVA-Inverter-Right side
6/10kVA-Inverter-Middle side
6/10kVA-Inverter-Left side
Step Checked components Instrument
function
Reference
Value
Failure Mode
(E,C) Ω 100kΩ Short 1 Q201,Q202,
Q203,Q204
(G,E) Ω 23.5kΩ Short or Open
2 D201,D202,D203,D204,D205 Diode 0.36V 0V
3 D210,D211,D212,D213 Diode 46Ω Open
4 R201,R202,R208,R209 Ω 10Ω Open
5 R203,R204,R210,R211 Ω 36Ω Open
Action ltem:Make sure the DC fuses with same rating as original ones for replacement. Otherwise,
unpredictable danger might happen.
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