ST3 6-10kVA Service Manual Rev.1Allis Electric Page 4 of total 12 September 20063. Troubleshooting3.2 PFC Analysis:In this section, some components you could check to see if failure occurs on PFC Correction circuit as shown below. Beaware of F301, F302 fuse open indicates failure of this block. Please replace all faulty components before re-start the UPS.6/10kVA-PFC-Right side6/10kVA-PFC-Left sideStep Checked components InstrumentfunctionReferenceValueFailure Mode1 F301, F302 Ω 0 Ω Open(A, K) Ω 2.6 MΩ Short or open2 Q301Q302 (G, K) Ω 10 Ω Short or openAction ltem: If all above-stated components are replaced well and UPS still can’t work, change the PFCIGBT driver module.