Dc Power Supply Is Absent - Canon NP7160 Service Manual

21. DC power supply is absent.

Cause
Step
AC power supply
Fuse (power supply
PCB)
Wiring, DC load
Power supply PCB
COPYRIGHT © 1998 CANON INC.
Checks
1 Is the rated voltage present between J204-1
and J204-3 on the DC power supply PCB?
2 Is the fuse (FU1, FU2, FU3, FU4, FU5) on
the power supply blown?
Turn off the power switch, and disconnect
3 the power plug. Disconnect J208, J209, J210
on the power supply PCB. Connect the
power plug, and turn on the power switch. At
this time, is the voltage between the
following terminals normal?
+
J208-1 J208-2
J208-3 J208-5
J208-4 J208-5
J209-4 J209-3
J210-1 J210-2
J210-8 J210-2
J211-7 J211-1
J211-5 J211-1
CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
– Output voltage
+24V
+5VU
+5VR
+24V
+24V
+5VU
+24V
+5VU
Yes/No
Actions
NO See "AC power is absent."
YES Remove the cause, and replace
the fuse.
YES Check the wiring and the
connectors of the DC power
supply line.
NO Replace the power supply
PCB.
10–53