Transport Troubleshooting - Canon LBP-1120 Service Manual

CHAPTER 4
IV. TRANSPORT TROUBLESHOOTING
Perform troubleshooting according to the malfunction diagnosis flowchart (Figure 4-1-1). If a "transport defect" is
found, the defective part must be located and rectified by the following procedures.
IV-1. Multiple Feed
<Possible Causes>
1. Worn or dirty separation pad surface.
Action: Clean the separation pad surface if dirty. Replace the separation pad if worn.
2. Defective separation pad spring.
Action: If the spring is out of position, set it in the right position. Replace the spring if deformed.
3. Worn or dirty sub pad surface.
Action: Clean the sub pad surface if dirty. Replace the sub pad if worn.
IV-2. Wrinkles/Folded Leading Edge
<Possible Causes>
1. Paper dust or dirt accumulates on the pickup roller, feed roller, and paper guide.
Action: Clean the dirty areas.
2. Dirty fixing unit entrance guide and pressure roller.
Action: Clean the fixing unit entrance guide and pressure roller.
3. Scarred or deformed fixing film unit.
Action: Replace the unit if scarred or deformed.
4. Scarred or deformed paper guide.
Action: Check the paper path. Replace any scarred or deformed guide(s).
IV-3. Skew
<Possible Causes>
1. Paper dust or dirt accumulates on the pickup roller, feed roller, and paper guide.
Action: Clean the dirty areas.
2. Scarred or deformed feed roller.
Action: Replace the roller if scarred or deformed.
3. Scarred or deformed paper guide.
Action: Check the paper path. Replace any scarred or deformed guide(s).
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