Canon GP405 Service Manual page 486

CHAPTER 14 TROUBLESHOOTING
12 E064 (The high-voltage output has a fault.)
Cause
Contact
Service mode
DIMM (for DC-
PC)
High-voltage
cable
Harness
Composite power
supply PCB, DC
controller PCB,
Image processor
PCB
14-68
Step
1 Are the contacts of the primary
charging roller, developing
assembly, and transfer charging
roller in contact with their
respective contacts of the copier?
2 Is the reading of
COPIER>ADJUST>HV-PRI
outside the indicated range?
3 Disconnect and then connect the
DIMM for the DC-CPU. Is the
problem corrected?
4 Is the resistance of the high-voltage
cable as indicated?
• Primary/transfer: about 10 KΩ
(The resistance of the
development cable is about 10
KW when the resistance in the
middle is included.)
5 Is the continuity of the following
harnesses between the DC
controller PCB and the composite
power supply PCB normal?
• J103-A1 to J209-A12
• J103-A3 to J209-A10
• J103-A6 to J209-A7
• J103-A7 to J209-A6
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Check Yes/No Action
NO Clean and correct the
contacts; if the problem
cannot be corrected, go
to step 0.
YES Enter the value indicated
on the service label.
Turn off and then on the
power; if the problem
still occurs, go to step 3.
YES End.
NO Replace the high-voltage
cable.
NO Replace the harness.
YES Replace the composite
power supply PCB, DC
controller PCB, and
image processor PCB.