ST3 6-10kVA Service Manual Rev.1
Allis Electric Page 6 of total 12 September 2006
4 R325, R331, R334, R342,
R337, R328
Ω 10Ω open
5 R390, R388, R389, R393,
R392, R391
Ω 2.2Ω open
6 F303, F304 Ω 0Ω open
(A,K) Ω 2.5MΩ short 7 Q305
(G,K) Ω 10Ω short
Action ltem: If all above-stated components are replaced well and UPS still can’t be DC start, change Boost
IGBT Driver Module.
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