Canon GP405 Service Manual page 498

CHAPTER 14 TROUBLESHOOTING
19 E240 (The communication between DC CPU and IP-CPU has a fault.)
Cause
DIMM
Image processor
PCB
E243 (The communication between the control panel and the image
20
processor PCB has a fault.)
Cause
Connector
Harness
Control panel
Image processor
PCB
14-80
Step Check
1 Turn off and then on the main
power. Is the problem corrected?
2 Disconnect and then connect
DIMM (J721, J722) on the image
processor PCB; then, turn on the
main power. Is the problem
corrected?
Step Check
1 Turn off and then on the main
power. Is the problem corrected?
2 Is the connection between the
connector J710 on the image
processor PCB and the J901 on the
CPU PCB good?
3 Is there continuity on the harness
between the control panel PCU
PCB and the image processor PCB?
• J901-B12 and J710-B4
• J901-B14 and J710-B
4 Replace the control panel. Is the
problem corrected?
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Yes/No Action
YES End.
YES End.
NO If the problem still
occurs after replacement
of the DIMM, replace
the image processor
PCB.
Yes/No Action
YES End.
NO Correct the connection.
NO Replace the harness.
YES End.
NO Replace the image
processor PCB.