Canon GP405 Service Manual page 488

CHAPTER 14 TROUBLESHOOTING
13 E100 (The beam detection mechanism has an error.)
Cause
Contact
BD harness, BD
harness wiring
Flat cable
CCD PCB
Image processor
PCB
BD PCB
14-70
Step
1 Is any connector between the BD
PCB, image processor PCB, CCD
PCB, or the laser diver PCB
disconnected? (particularly,
between BD and IP)
2 Is the continuity of the harness
between the BD PCB and the
image processor PCB normal? In
addition, check to make sure that
the BD harness is not connected to
the light-receiving face of the BD
PCB.
3 Check the flat cable between the
CCD PCB and the image processor
PCB for continuity. Is there
continuity?
• J301-2 and J706-39 (SYNC
signal)
• J301-4 and J706-37 (SYNC
signal)
4 Replace the CCD PCB. Is the
problem corrected?
5 Replace the image processor. Is the
problem corrected?
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Check Yes/No Action
YES Correct the connection.
NO Replace the harness. If
the BD harness is
connected to the BD
harness, correct the
wiring.
NO Replace the flat cable.
During replacement, be
sure to lock the
connectors.
YES End.
YES End.
NO Replace the BD PCB.