Canon PIXMA MP500 Service Manual page 18

Unsatisfactory print quality No printing, or no color ejected.
Paper feed problems (multi-
feeding, skewed feeding, no
feeding)
Carriage movement problems
(contact to other parts, strange
noise)
Faulty scanning (no scanning,
strange noise)
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.
- LCD, or
- logic board ass'y
- Examine the inside to confirm that no parts are
damaged, and the rollers are clean.
- Remove foreign material.
- Adjust the paper guide properly.
- Confirm the connection of each harness and the
logic board.
- Replace the
- sheet feeder unit,
- cassette, or
- logic board ass'y
- Confirm that the timing slit strip film is free from
damage or grease.
- Clean the timing slit strip film.
- Replace the
- timing slit strip film, or
- carriage unit.
- Remove foreign material.
- Confirm the connection between the scanner unit
and the logic board.
- Replace the
- scanner unit, or
- logic board ass'y
- Replace the
- ink tank,
*2
- print head
- 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,
*2
- 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
*2
- print head
- Perform print head alignment.
- Replace the
- ink tank, or
*2
- print head
- Perform print head alignment.
Replace the logic board ass'y
1-12
*1
.
*1
.
*1
.
, or
*1
.
,
*1
.
.
.
*1
.