Canon PIXMA MP800 Service Manual - Page 16

When enlarged in the carriage movement direction, Paper gets smeared. - print head incorrect

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Carriage movement problems (contact to - Confirm that the carriage timing slit strip film is free from other parts, strange noise) 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. Faulty scanning (no scanning, strange noise) - Confirm the connection between the scanner unit and the logic board. - Replace the - scanner unit, or - logic board ass'y. The FAU lamp does not light. - Confirm the connection between the scanner unit, FAU, and the logic board. - Replace the - document pressure plate unit (FAU), or - logic board ass'y. Unsatisfactory print quality No printing, or no color ejected. - Replace the - ink tank, - print head*1, or - logic board ass'y. - Remove foreign material from the purge unit caps, if any. - Replace the purge unit. Printing is faint, or white lines appear on - Remove and re-install the print head. printouts even after print head cleaning. - Replace the Line(s) not included in the print data appears on printouts. - ink tank, - print head*1, - purge unit, or - logic board ass'y. Paper gets smeared. A part of a line is missing on printouts. Color hue is incorrect. Printing is incorrect. - 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 - print head*1. - Replace the - ink tank, or - print head*1. - Perform print head alignment. Replace the logic board ass'y. No ejection of black ink. Graphic or text is enlarged on printouts. - Replace the - ink tank, or - print head*1. - 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. 1-11

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Carriage movement problems (contact to
other parts, strange noise)
- 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.
Faulty scanning (no scanning, strange
noise)
- Confirm the connection between the scanner unit and the
logic board.
- Replace the
- scanner unit, or
- logic board ass'y.
The FAU lamp does not light.
- Confirm the connection between the scanner unit, FAU,
and the logic board.
- Replace the
- document pressure plate unit (FAU), or
- logic board ass'y.
Unsatisfactory print quality
No printing, or no color ejected.
- Replace the
- ink tank,
- print head
*1
, or
- logic board ass'y.
- Remove foreign material from the purge unit caps, if any.
- Replace the purge unit.
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.
- Remove and re-install the print head.
- Replace the
- ink tank,
- print head
*1
,
- purge unit, or
- logic board ass'y.
Paper gets smeared.
- Feed several sheets of paper.
- Perform bottom plate cleaning.
- Clean the paper path with cotton swab or cloth.
- Clean the ASF sub-rollers.
A part of a line is missing on printouts.
- Replace the
- ink tank, or
- print head
*1
.
Color hue is incorrect.
- Replace the
- ink tank, or
- print head
*1
.
- Perform print head alignment.
Printing is incorrect.
Replace the logic board ass'y.
No ejection of black ink.
- Replace the
- ink tank, or
- print head
*1
.
- Remove foreign material from the purge unit caps, if any.
- Replace the purge unit.
Graphic or text is enlarged on printouts.
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.
1-11