Canon CLBP-460PS, Service Manual

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[ 6-30 ] “DOOR OPEN UPPER DRAWER” message appears when the drum cartridge draw-
er is closed
<Possible causes>
1) Damaged drum cartridge drawer sensor actuator
Action: Replace the drum cartridge drawer sensor actuator if damaged.
2) Poor contact in the drum cartridge drawer switch connector
Action: Reconnect the connectors between the ITB unit drawer switch and DC controller
PCB correctly.
3) Defective drum cartridge drawer switch
Action: Replace the drum cartridge drawer switch.
4) Defective DC controller PCB
Action: Replace the DC controller PCB.
[ 6-31 ] “DOOR OPEN TOP COVER” message appears when the toner cartridge door is
closed
<Possible causes>
1) Damaged toner cartridge door switch actuator
Action: Replace the toner cartridge door switch actuator if damaged.
2) Poor contact in the toner cartridge door switch connector
Action: Reconnect the connectors between the toner cartridge door switch and DC con-
troller PCB.
3) Defective toner cartridge door switch
Action: Replace the toner cartridge door.
4) Defective DC controller PCB
Action: Replace the DC controller PCB.
[ 6-32 ] “DOOR OPEN REAR COVER” message appears when the rear cover is closed
<Possible causes>
1) Damaged rear door switch actuator
Action: Replace the rear door switch actuator.
2) Damaged rear door switch push arm
Action: Replace the rear door switch push arm if damaged.
3) Damaged front door switch actuator
Action: Replace the front door switch actuator.
4) Damaged front door switch push arm
Action: Replace the front door switch push arm if damaged.
5) Defective rear door switch
Action: Remove the rear door switch (SW5). If there is no continuity between the rear door
switch connector J74-1 and J74-2 when the rear door switch is turned ON, replace
4 - 49
CHAPTER 4