Canon imageRUNNER ADVANCE 4551i Service Manual page 354

■ Paper Reverse Side Stained with Toner
Occurrence area]
• Fixing assembly (circumference of the roller: approx.94 mm)
• Transfer roller (circumference: approx.50 mm)
Cause
Fixing Assembly: Toner came off the paper sticks to the pressure roller, and then the toner sticks to the reverse side of the paper.
Transfer Roller: Toner remained on the drum that had stopped at occurrence of a jam. During the recovery operation performed
later, the toner sticks to the transfer roller.
Occurrence condition
Fixing Assembly: When fixing ability is poor due to low temperature, a halftone image has been printed on a lot of sheets of paper,
or the time for replacement of the transfer unit is near.
Transfer Roller: When a paper jam has occurred or the time for replacement of the transfer roller is near.
Remedy
• Fixing Assembly: Service mode (Lv.2: FIX-CLN)
COPIER > FUNCTION > CLEANING > FIX-CLN
• Transfer Roller: Service mode (Lv.2: TR-CLN)
COPIER > FUNCTION > CLEANING > TR-CLN
■ Stained Leading/Trailing Edge of Paper
Occurrence area
• Transfer Front Guide
• Fixing Inlet Guide
Cause
• Transfer Front Guide: The leading or trailing edge of paper touches the toner stuck to the transfer front upper guide.
• Fixing Inlet Guide: The leading or trailing edge of paper touches the toner stuck to the fixing inlet guide.
Occurrence condition
When halftone or solid-black images are printed in succession
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6. Troubleshooting