Canon GP335 Service Manual page 503

26 E604 (The image memory has a fault.)
Cause
Contact
(expansion image
memory)
Expansion
memory
Image memory
Image processor
PCB
27 E605 (The image memory battery has a fault.)
Cause
Connector
Battery
Image processor
PCB
28 E674 (The fax unit has a fault.)
Cause
Connector
Fax PCB
System
motherboard
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Step Check
1 Turn off and then on the main
power. Is the problem corrected?
2 Disconnect and connect the image
memory, and turn on the main
memory. Is the problem corrected?
3 If only one image memory has been
expanded, is it in J724?
4 Disconnect the expanded image
memory, and turn on the power. Is
the problem corrected?
Step Check
1 Turn off the main power, and turn
it on in about 1 min. Is the problem
corrected?
2 Is the harness between the battery
PCB and the image processor PCB
connected correctly?
3 Replace the battery. Is the problem
corrected?
Step Check
1 Is the connection of the following
normal?
• between fax PCB and system
motherboard
• between system motherboard
and image processor PCB
(between fax unit and machine)
CHAPTER 14 TROUBLESHOOTING
Yes/No
YES End.
YES Correct the connection
of the image memory.
YES Relocate it to J723. (A
sole memory must be
installed to J723.)
YES Replace the image
memory.
NO Replace the image
processor PCB.
Yes/No
YES End.
NO Correct the connection.
YES Replace the battery.
NO Replace the image
processor PCB.
Yes/No
YES Correct the connection.
At this time, check the
pins for deformation.
NO Replace the fax PCB.
Replace the system
motherboard.
Action
Action
Action
14-85