Service manual

!
BE SURE TO use fuse with same spec as original ones to replace failure ones, otherwise,
unpredictable danger could happen.
If all components listed above are in normal condition and UPS still can’t be DC started, try
to change DCDC module.
6.3.5 DC/AC Inverter Analysis
Item Checked components Instrument function Reference Value Failed Condition
1 F3, F2, F1
Ω
Short Open
2 2k/3k:Q14, Q13, Q16, Q15 (EC)
1k:Q14, Q13, Q16, Q15 (EC)
Diode Voltage Droop 0.4 Short or open
3 2k/3k:Q14, Q13, Q16, Q15 (CE)
1k:Q14, Q13, Q16, Q15 (CE)
Diode Voltage Droop Infinite Short
4 2k/3k: R110, R106, R117, R119
2k/3kR53,R37
Ω
2K/3K: 47K
1K: 20K
Open
5 2k/3k:R107, R109, R116, R120
R114, R103, R111, R122
1k: R40, R54
Ω
10.0
10.0
36.0
Open
If fail condition stated in item 3 occurs, it is very possible that the corresponding IGBT driver
module is damaged, so please try to change the IGBT driver module.
36