Samsung OFFICESERV 7100 Service Manual page 115

3.4.2.2 -54 V Power is not Supplied to Module
Start
-54 V power is not supplied to
the entire module?
Yes
The R61 power supply is normal?
Yes
The power output in D1 CATHOD
is abnormal?
Yes
CTRL_PWR signal is normal?
Yes
Replace and check Q3.
End
© SAMSUNG Electronics Co., Ltd.
Check the mattern up to the module
No
connector of -54 V.
No
Check the PSU output voltage and
the UNI card input power(M54 pin).
No
Check the -54 V pattern.
No
Check the signals in U1 and replace
U1.
OfficeServ 7100 Service Manual
3-21