Service manual

6.3.2 P.F.C Converter Analysis:
In this section, some components you could check to see if failure occurs to P.F.C Converter.
General speaking, OPEN of fuse F3 indicates failure of this block. Please replace all fail to
check components then utility can be connected to your UPS.
Item Checked components Instrument function Reference Value Failed condition
1 F3
Ω
Short Open
2 2K/3K:Q09, 1K:Q14 (CE) Diode Voltage Droop Infinite Short or open
3 2K/3K:D16, D17
1K: D10, D11
Diode Voltage Droop 0.44 Short or open
4 2K/3K:R66, R208 1K:R68
Ω
47.0/36.0/36.0 Open or value
change
5 2K/3K:REC02/ 1K:REC1
(+,～),(～,-)
Diode Voltage Droop 0.46 Short or open
If all components listed above are in normal condition and UPS still can’t work, try to
change PFC control module and IGBT driver module
6.3.4 Push-Pull DC-DC Converter Analysis
General speaking, the most obvious phenomenon of failure on the section is open of F1 and F2.
Knowing this will be very helpful to repair them.
Item Checked components Instrument function Reference Value Failed Condition
1 F1, F2
Ω 0Ω
Open
2 2K/3K:Q04~Q07 (SD)
1K:Q4, Q6, Q10, Q11 (SD)
Diode Voltage Droop 0.42V Short or open
3 2K/3K:Q04~Q07 (DS)
1K:Q4, Q6, Q10, Q11 (DS)
Diode Voltage Droop Infinite Short or open
4 2K/3K:R31, R33, R34, R36
1K:R7, R73, R76, R77
Ω 10Ω
Open
5 2K/3K:D05, D06, D07, D08
1K:D12, D13, D14, D15
Diode Voltage Droop 0.41V Short or open
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