Canon LBP1760P, Service Manual

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IV. PAPER TRANSPORT TROUBLESHOOTING
If the factor of the malfunction is identified as "paper transport troubleshooting" by the mal-
function diagnosis flowchart (Figure 4-1-1), execute the followings and mend the defect.
T-1. Multiple feed
<Possible causes>
1. If jams occur in the multi-purpose tray, perform step 7 and thereafter.
2. Incorrectly set paper
Action: Set the paper caught by the claw of the cassette.
3. Deformed cassette claw
Action: Replace the cassette claw if deformed.
4. Worn or deformed cassette separation roller
Action: Replace the separation roller. The cassette feed roller is to be replaced together with
the separation roller.
5. Spring pushing the separation roller is defective.
Action: Replace the spring which is pushing the separation roller.
6. Defective torque limiter
Action: Replace the torque limiter.
7. Worn separation pad surface
Action: Replace the separation pad.
8. Spring pushing the separation pad is defective.
Action: Replace the spring which is pushing the separation pad.
T-2. Wrinkles/folded leading edge
<Possible causes>
1. Paper is curled
Action: Straighten the paper, and then instruct the user.
2. Open the top cover after the paper is picked up before it enters the fixing unit. If the paper
is wrinkled or folded at its leading edge at this point, perform step 5 and thereafter.
3. Dirty fixing unit entrance guide
Action: Clean the fixing unit entrance guide.
4. Dirty pressure roller
Action: Clean the pressure roller.
5. Fixing film unit is scarred or deformed.
Action: Replace the unit if scarred or deformed.
6. Dirty or worn registration arm
Action: Clean the registration arm if dirty. Replace it if worn.
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CHAPTER 4