Canon LBP-1000 Service Manual page 137

Action: Replace the engine controller PCB
III-4. Transfer and feed block
<Possible causes>
1. Dirty, worn or deformed registration roller
Action: Clean the registration roller if dirty. Replace it if worn or deformed.
2. Dirty or worn registration shutter
Action: Clean the registration shutter if dirty. Replace it if worn.
3. Registration shutter does not move smoothly, or the spring is out of place.
Action: Adjust the shutter so that it moves smoothly. If the spring is out of place, set it in
the right position or replace it with new one.
4. 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.
5. Transfer charging roller does not rotate smoothly.
Action: Replace the bushing. Replace any worn gear(s).
6. Damaged feed belt
Action: Replace the feed belt.
7. Damaged registration roller drive gear
Action: Replace the gear.
8. Damaged feed belt drive gear
Action: Replace the gear.
9. Defective engine controller PCB
Action: Replace the engine controller PCB.
III-5. Fixing and delivery block
<Possible causes>
1. Pressure roller does not rotate smoothly.
Action: Check the gears, and replace any worn or fractured gear(s).
2. Fixing unit entrance guide has projections due to dirt, scars or toner.
Action: Clean the fixing unit entrance guide.
3. Fixing film unit or pressure roller has projections due to dirt or toner.
Action: Clean the dirty areas.
4. Fixing film unit or pressure roller is deformed or scarred.
Action: Replace the deformed or scarred part(s).
5. Nip width is not within the specification.
Action: Replace the fixing unit.
6. Delivery sensor lever does not move smoothly, or is damaged.
CHAPTER 4
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