PTX2-A3 Service Manual Rev.2
Page 3 of total 19 August 2007
3. Troubleshooting
3.1 Quick Start
Before any check of UPS, please check the components as listed in the following table. This action could help you find
problem quickly and make sure these components good or not first.
Possible Circuit Block
Coded Components
Description
Failure Mode
BAT FUSE
F303/F304
Fuse
Open
I/P FUSE (on PSDR)
F301/F302
Fuse
Open
PFC Correction
Q301, Q302
MOSFET
A-K Short or open
Q306, Q307,Q308, Q309,
Q310, Q311
IGBT
D-S short or open
D302, D304, D306, D303,
D305, D307
Push-Pull Boost
D309, D311, D308, D310
Power Diode
Short or open
Q201, Q202, Q203, Q204
IGBT
C-E short or open
D201, D202, D203, D204,
D205
Inverter
D210, D211, D212, D213
Power Diode
Short or open
Charger module(standard)
Q907, Q908
IGBT
D-S short or open
D901,D902,D903
Power Diode
Short or open
Q909
MOSFET
A-K Short or open
IP SCR module
Q3, Q4, Q5, Q6
MOSFET
A-K short or open
For the 6 and 10kVA, both of the boards are the same size, only the some power components of
10kVA should be more than 6kVA.
If the fuse is open, replacing fuse only,
DO NOT
mean you have solved the problem. General
speaking, fuse open was caused by other failure of components; therefore, you must find the
real defective components and replace them, before restart the UPS.
