Canon GP405 Service Manual page 490

CHAPTER 14 TROUBLESHOOTING
14 E110 (The laser scanner motor fails to rotate normally.)
Cause
Contact
Laser scanner
motor driver PCB,
Laser scanner unit
Low-voltage
power supply
PCB
DC controller
PCB
Laser scanner
motor PCB
DC controller
PCB
Image processor
PCB
14-72
Step
1 Check the wiring. Is the problem
corrected?
2 Operate any keys while in standby.
Is the rotation sound of the scanner
motor heard?
3 Is the laser scanner motor driver
PCB supplied with power?
• J445-1 (38 VDC)
4
5 Does the voltage of J104-A2
(M4D) on the DC controller PCB
change from 0 to about 4 or 5
VDC while the scanner motor is
rotating? (Enter '1' to the silent
mode setting; does it change from
about 4 or 5 to 0 V 8 sec after the
end of copying?)
6 Is '1' indicated as the reading of I/
O>DC-CON>P003-bit2?
7 Replace the DC controller PCB. 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 End.
YES Go to step 5.
YES Replace the laser
scanner driver PCB and
the laser scanner unit.
NO Replace the low-voltage
power supply PCB.
NO Check to make sure that
the harness between the
DC controller PCB and
the image processor
PCB has continuity;
then, replace the DC
controller PCB.
YES Replace the laser
scanner PCB.
YES End.
NO Replace the image
processor PCB.