Canon MultiPASS C50 Service Manual page 132

Part 1: Facsimile
4. TROUBLESHOOTING
4.1 Troubleshooting Index
For troubleshooting, use the troubleshooting index below to investigate the cause of the problem and refer
to the specified page for countermeasures.
Problem
• General errors
• The unit does not power on. (Evaluation criteria: Look at the unit in question.)
• The display looks abnormal. (Evaluation criteria: Check it with the operation panel test.)
• The keys do not work. (Evaluation criteria: Check it with the operation panel test.)
• No sound from the speaker
• Errors shown on the display (Evaluation criteria: Look at the unit in question.)
• The error message can be checked.
• The error code can be checked.
• Printing problem (Evaluation criteria: Test printing is no good.)
• The paper is not fed properly.
The paper feed motor does not run.
The paper is not picked up from the auto sheet feeder.
• The printing operation is abnormal.
Nothing is printed.
The carriage motor does not run.
• Printing quality error
(Evaluation criteria: Look at the printing result.)
Print is not clear.
Blurred or smudged characters.
Smudges appear on back of printed page.
Irregular print quality.
Print head needs cleaning.
Horizontal white stripes appear on some entirely black parts of the print.
• Scanning problem (Evaluation criteria: Test printing is good, but the copied image is no
good.)
• The document is not fed.
The document feed motor does not run.
The document slips against the rollers.
The document does not separate.
Faulty scanner unit's sensors
• The scanning image is abnormal.
Nothing is printed.
The image has vertical stripes.
The image has thick vertical stripes.
The half-tone image contains black dots.
The color or brightness of the scanned image is not normal.
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