Canon LBP1760P, Service Manual

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6. Defective paper feeder driver PCB
Action: Replace the paper feeder driver PCB.
7. Defective engine controller PCB
Action: Replace the engine controller PCB.
J-5. Transfer and feed block
<Possible causes>
1. Paper is curled downward
Action: When a paper 180mm or less in length is jammed before reaching the fixing roller,
examine whether the paper is curled downward. If it is, straighten the paper, and
then instruct the user.
2. If the paper does not reach the registration arm, perform step 10 and thereafter.
3. Dirty, worn, or deformed pre-transfer roller
Action: Clean the pre-transfer roller if dirty. Replace it if worn or deformed.
4. Dirty or worn registration arm
Action: Clean the registration arm if dirty. Replace it if worn.
5. Registration arm does not move smoothly, or the spring is out of place.
Action: Adjust the arm so that it move smoothly. If the spring is out of place, attach it or
replace it.
6. Top of page sensor lever does not move smoothly, or is damaged.
Action: Adjust the lever so that it moves smoothly. Replace it if damaged.
7. Transfer charging roller does not move smoothly.
Action: Replace the busing. Replace the gear if worn.
8. Damaged feed belt
Action: Replace the belt.
9. Damaged feed belt drive gear
Action: Replace the gear.
10. Dirty, worn, or deformed feed roller
Action: Clean the feed roller if dirty. Replace it if worn or deformed.
11. Damaged gears
Action: Remove the multi-purpose tray pick-up unit, and replace any damaged gears.
12. Defective feed roller clutch
Action: Disconnect the feed roller clutch connector J128. Measure the resistance between
cable side connector J128-1 and J128-2. If it is not about 145 , replace the feed
clutch.
13. Defective engine controller PCB
Action: Replace the engine controller PCB.
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CHAPTER 4