Canon CLBP-460PS, Service Manual

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3) Damaged reversing unit drive gears
Action: Replace any drive gears of the reversing unit if damaged or worn.
4) Defective reversing unit paper sensor lever and reversing unit stationary paper sensor lever
Action: If the reversing unit paper sensor lever or reversing unit stationary paper sensor
lever does not move smoothly or the levers are out of positions, adjust them cor-
rectly. Or, replace them if damaged or deformed.
5) Poor contact in the reversing motor drive line connector
Action: Reconnect the connectors between the reversing motor and Duplexing driver PCB.
6) Poor contact with the printer
Action: Reconnect the connector that connects the duplexing unit to the printer. Replace
the connector if damaged.
7) Defective reversing motor
Action: Replace the reversing motor.
8) Defective duplexing driver PCB
Action: Replace the duplexing driver PCB.
9) Worn/deformed duplexing feed roller
Action: Replace the duplexing feed roller.
10) Damaged gears
Action: Replace any damaged or worn drive gears in the duplexing feed unit.
11) Defective duplexing feed unit paper sensor lever
Action: Adjust the lever correctly if it does not move smoothly or is out of position. Or,
replace it if damaged/deformed.
12) Poor contact in the duplexing feed motor drive line connector
Action: Reconnect connectors between the duplexing feed motor and the duplexing driver
PCB and between the duplexing unit and the printer connector.
13) Defective duplexing feed motor
Action: Replace the duplexing feed motor.
14) Defective duplexing driver PCB
Action: Replace the duplexing driver PCB.
[ 3-6 ] Paper feeder block
<Possible causes>
1) Make a test print from the cassette in the printer. If paper jam occurs, go to “3-2 Cassette
pick-up block.”
2) Worn/deformed paper feeder pick-up roller and paper feeder feed roller
Action: Replace the rollers if worn or damaged. The separation roller and the paper feeder
feed roller must be replace at the same time.
3) Damaged drive gears
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CHAPTER 4