Canon LBP-1000 Service Manual page 135

III-1. Multi-purpose tray pick-up block
<Possible causes>
1. Defective video controller PCB
Action: Make an engine test print from the Multi-purpose tray. If the printer feeds the
paper normally, replace the video controller PCB.
2. Curled paper
Action: Straighten the paper, and then instruct the user.
3. Dirty, worn, or deformed multi-purpose tray pick-up roller
Action: Clean the pick-up roller if dirty. Replace it if worn or deformed.
4. Spring of the tray is out of place or defective
Action: Set the spring in the right position. Replace it if defective.
5. Worn or damaged tray cam
Action: Replace the cam.
6. Damaged gear
Action: Replace the gear.
7. Defective multi-purpose tray pick-up solenoid
Action: Disconnect the multi-purpose tray pick-up solenoid connector J404 from the engine
controller PCB. Measure the resistance between the cable side connector J404-1
and J404-2. If it is not about 95 , replace the multi-purpose tray pick-up solenoid.
8. Poor contact in the main motor drive signal line connector
Action: Reconnect the main motor connector J1702 and the intermediate PCB connector
J1007 correctly.
9. Defective main motor
Action: Replace the main motor.
10. Poor contact in the engine controller PCB connector.
Action: Reconnect the engine controller PCB connector J401 correctly.
11. Defective engine controller PCB
Action: Replace the engine controller PCB.
III-2. Cassette pick-up block
<Possible causes>
1. Defective video controller PCB
Action: Make an engine test print from the paper feeder. If the printer feeds the paper nor-
mally, replace the video controller PCB.
2. Dirty, worn, or deformed cassette pick-up roller
Action: Clean the roller if dirty. Replace it if worn or deformed.
3. Damaged gear
Action: Check the gears of the cassette pick-up unit and feed roller. Replace any damaged
CHAPTER 4
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