E202 (The Keys On The Control Panel Are Locked.); E203; E204 (The Keys On The Control Panel Are Locked.) - Canon NP6251 Service Manual

17. E202 (The keys on the control panel are locked.)

Cause Step
1
Scanner home 2
position sensor
(PS1)
DC controller
PCB

18. E203

Cause Step
1
Scanner home 2
position sensor
DC controller
PCB

19. E204 (The keys on the control panel are locked.)

Cause Step
1
Scanner 2
original leading
edge sensor
1/2 (PS3/4)
DC controller
PCB
COPYRIGHT © 1997 CANON INC.
Download service manual and resetter printer at http://printer1.blogspot.com
Checks
Is the scanner at home position
when E202 turns on?
Is the scanner home position
sensor (PS1) normal? (See the
instructions on how to check
photointerrupters.)
Checks
Is the scanner at home position
when 'E202' is indicated?
Is the scanner home position
sensor (PS1) normal?
Checks
Does the scanner move forward
when the Copy Start key is
pressed?
Is the scanner original leading
edge sensor 1/2 (PS3/4) normal?
(See the instructions on how to
check the photointerrupters.)
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 11 TROUBLESHOOTING
YES/NO Action
NO See "The scanner fails
to rotate."
YES Check the wiring from
the DC controller to PS1;
if normal, replace the
sensor PS1.
NO Replace the DC
controller PCB.
YES/NO Action
NO See "The scanner fails
to move forward."
NO Replace the scanner
home position sensor.
YES Replace the DC
controller PCB.
YES/NO Action
NO See "The scanner fails
to move forward."
NO Check the wiring from
the DC controller PCB to
PS3/4; if normal, replace
PS3/4.
YES Replace the DC
controller PCB.
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