Service manual

FrameMaker Ver.5.5E(PC) Di350 TROUBLESHOOTING
98.12.09
T- 4 2
(7) The Copier Does not Turn ON.
Relevant Electrical Parts
Power Switch S1
Side Cover Interlock Switch 1 S2
Power Supply Unit 1 PU1
Power Supply Unit 2 PU2
Master Board PWB-A
Control Panel UN1
MFB Board UN2
Symptom Step Check Item Result Action
Power
does not
turn ON.
1 Is there an AC power supply
voltage across PJ1PU1-1 and 3
on PU1 when S1 is turned ON?
NO Check S1, PU1 fuse, and
power supply voltage.
2 Is the voltage across PJ5PU1-
10 and GND DC5V when S1 is
turned ON?
YES Check the fuse on PWB-A.
NO Change PU1.
3 Is the voltage across PJ5PU1-4
and GND DC24V when S1 is
turned ON?
NO Change PU1.
4 Is the voltage across PJ5PU1-3
and GND DC24V when S1 is
turned ON?
NO Change PU1.
5 Does the voltage across the S2
connector (yellow) and GND
change from DC0V to DC24V
when S2 is turned ON?
NO Check S2.
6 Is the voltage across PJ7PU1-9
on PU1 and GND DC3.3V?
NO Change PU1.
7 Is the voltage across CN1PU2-1
on PU2 and GND DC24V?
NO Change PU1.
8 Is the voltage across CN28UN2-
8 on UN2 and GND DC-12V?
NO Change PU2.
9 Is the voltage across CN28UN2-
7 on UN2 and GND DC12V?
YES Change PWB-A.
NO Change PU2.
The con-
trol panel
indicates
nothing.
1 Is DC24V being output from
UN2 to UN1?
Disconnect CN1UN1 of UN1
and check to see if the voltage
across CN1UN1-1 on the har-
ness side and GND is DC24V.
NO Change UN2.
2 Is DC5V being output from UN2
to UN1?
Disconnect CN1UN1 of UN1
and check to see if the voltage
across CN1UN1-28 on the har-
ness side and GND, and across
CN1UN1-29 and GND, is DC5V.
YES Change UN1.
NO Change UN2.