Canon LASER CLASS 730i Service Manual page 92

4. TROUBLESHOOTING
4.1 Troubleshooting Index
Using the troubleshooting index below to investigate the cause of a problem and refer to the
specified page for countermeasures.
Problem
• Errors shown on the display (Evaluation criteria: Look at the unit in
question.)
• The error message can be checked.
• The printer error message can be checked.
• The error code can be checked.
• General errors
• The unit does not pawer on.
• The display looks abnormal.
• The buttons do not work.
• No sound from the speaker.
• Printing problems (Evaluation criteria: Test printing is faulty.)
• The paper is not fed correctly.
The main motor does not run.
The Reverse motor does not run.
The paper is not picked up from the multi-purpose tray.
The paper is not picked up from the cassette.
The paper is not picked up from the duplex feed unit.
The paper skews.
• The printing operation is abnormal.
The recording paper is not fed between transfer and feed section.
The recording paper is not fed between fixing and delivery section.
Multiple feed.
Wrinkles/folded leading edge.
• Poor printing quality.
Light
Dark
Completely blank
All black
Dots
Marks on back of papers
Black vertical lines
Irregular and smudged black vertical lines
Irregular and smudged black horizontal lines
Marks
Blank spots
White vertical lines
LASER CLASS 730i/720i/710 Chapter 4: Maintenance and Service
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