Canon MP800 - PIXMA Color Inkjet Service Manual page 16

Unsatisfactory print quality No printing, or no color ejected.
Carriage movement problems (contact to
other parts, strange noise)
Faulty scanning (no scanning, strange
noise)
The FAU lamp does not light.
Printing is faint, or white lines appear on
printouts even after print head cleaning.
Line(s) not included in the print data
appears on printouts.
Paper gets smeared.
A part of a line is missing on printouts.
Color hue is incorrect.
Printing is incorrect.
No ejection of black ink.
Graphic or text is enlarged on printouts.
- Confirm that the carriage timing slit strip film is free from
damage or grease.
- Clean the carriage timing slit strip film (with ethanol and
lint-free paper).
- Replace the
- carriage timing slit strip film, or
- carriage unit.
- Confirm the connection between the scanner unit and the
logic board.
- Replace the
- scanner unit, or
- logic board ass'y.
- Confirm the connection between the scanner unit, FAU,
and the logic board.
- Replace the
- document pressure plate unit (FAU), or
- logic board ass'y.
- Replace the
- ink tank,
*1
- print head , or
- logic board ass'y.
- Remove foreign material from the purge unit caps, if any.
- Replace the purge unit.
- Remove and re-install the print head.
- Replace the
- ink tank,
*1
- print head ,
- purge unit, or
- logic board ass'y.
- Feed several sheets of paper.
- Perform bottom plate cleaning.
- Clean the paper path with cotton swab or cloth.
- Clean the ASF sub-rollers.
- Replace the
- ink tank, or
*1
- print head .
- Replace the
- ink tank, or
*1
- print head .
- Perform print head alignment.
Replace the logic board ass'y.
- Replace the
- ink tank, or
*1
- print head .
- Remove foreign material from the purge unit caps, if any.
- Replace the purge unit.
When enlarged in the carriage movement direction:
- Clean grease or oil off the timing slit strip film
- Replace the
- timing slit strip film,
- carriage unit, or
- logic board ass'y.
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