Canon LBP1760P Service Manual page 179

J-1. Envelope feeder pick-up block
<Possible causes>
1. Warped or twisted envelope
Action: Straighten the warped or twisted envelope, and then instruct the user.
2. Defective video controller PCB
Action: Make a test print from the envelope feeder. If the envelope is picked up correctly,
replace the video controller PCB.
3. Dirty, worn or deformed envelope pick-up roller
Action: Clean the pick-up roller if dirty. Replace it if worn or deformed.
4. Damaged gears
Action: Check the gears of envelope feeder, and replace any damaged gears.
5. Defective envelope pick-up solenoid
Action: Disconnect the envelope pick-up solenoid connector J901 from the envelope feeder
driver PCB. Measure the resistance between cable side connector J902-1 and J902-
2. If it is not about 129 , replace the envelope pick-up solenoid.
6. Defective envelope feeder driver PCB
Action: Replace the envelope feeder driver PCB.
7. Defective engine controller PCB
Action: Replace the engine controller PCB.
J-2. Multi-purpose tray pick-up block
<Possible causes>
1. Curled paper
Action: Straighten the paper, and then instruct the user.
2. Defective video controller PCB
Action: Make a test print from the multi-purpose tray. If the paper is picked up correctly,
replace the video controller PCB.
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. Damaged gears
Action: Check the gears of multi-purpose tray pick-up unit, and replace any damaged
gears.
5. Defective multi-purpose tray pick-up solenoid
Action: Disconnect the mutil-purpose tray pick-up solenoid connector J126. Measure the
resistance between cable side connector J126-2 and J126-3. If it is not about 110 ,
replace the multi-purpose tray pick-up solenoid.
6. Defective engine controller PCB
Action: Replace the engine controller PCB.
CHAPTER 4
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