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-18-
13.0 USP Troubleshooting Algorithm
Breaker
& Fuse
Cable
insulation
Film cap.
Visual
check
SCR
check
1.
The transducer operation lamps are turned off then check the audible sound
from transducers and no sound is detected then switch off the USP & AC
supply -- Audible sound is detected then the LED lamps are failed - change
the LED lamps
2.
Open the USP cover and check the fuse and breaker
3.
The fuse is blown off then check the insulation between each terminals
(No A(31),B(32,33),C(35) and Ground( case) with Mega ohm tester(Insulation
tester)
4.
The insulation is OK(over 200Mohm), then check the C2/C3 capacitors with
visual check
5.
The C2/C3 capacitor are ok, then disconnect the socket from control board
and check the SCR short test
6.
SCR is replaced or OK then replace fuse and turn on USP
7.
Check the AC voltage and rectified DC voltage refer to the commissioning
procedure/report & turn off again & connect the control board socket & turn on
USP and check the TD operation lamp & close the cover.
Repair cables
Replace capacitor
Replace SCR
OK
OK
OK
OK
Fail
Fail
Fail
Fail
Replace Fuse
Turn ON
