Canon GP405 Service Manual page 515

49 The Add Paper message fails to turn off.
Cause
Pick-up PCB
Paper sensor
DC controller
PCB
50 The jam message fails to turn off.
Cause
Jam paper
Paper sensor
DC controller
PCB
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Step Check
1 Does the lifter move up?
2 Is the pick-up PCB mounted to the
pick-up unit correctly?
3 Put paper in the cassette, and set
the cassette in the machine. Is the
reading of I/O>DC-CON>P008-
bit10 (upper) and -bit11 (lower) '0'
when there is paper? (upon
detection, '0')
upper: J108-A10
lower: J108-A11
Step Check
1 Find out the location of the jam in
service mode (DISPLAY>JAM). Is
the jam paper near the sensor which
has detected a jam?
2 Is the sensor in question normal?
• I/O check
• Meter check
CHAPTER 14 TROUBLESHOOTING
Yes/No
NO See "The lifter fails to
move up."
NO Correct the mounting.
NO Check the sensor lever;
if normal, replace the
problem sensor.
YES Replace the DC
controller PCB.
Yes/No
NO See "The lifter fails to
move up."
NO Replace the sensor.
YES Replace the DC
controller PCB.
Action
Action
14-97