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Troubleshooting By Symptom - Canon MX860 Service Manual

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2-4. Troubleshooting by Symptom

Faulty operation
Unsatisfactory print quality
Symptom
The power does not turn on.
The power turns off immediately
after power-on.
A strange noise occurs.
The LCD does not display properly.
A portion of the LCD is not
displayed.
The display flickers.
Paper feed problems (multi-feeding,
skewed feeding, no feeding).
Faulty scanning (no scanning,
strange noise).
No printing, or no color ejected.
Faint printing, or white lines on
printouts.
Uneven printing.
Improper color hue.
(1) Confirm connection of the power supply unit:
- Harness and connector conditions
(2) Replace the following item(s):
- Logic board
- Power supply unit
- Panel board
(1) Examine and remove any foreign material or paper
debris.
(2) Replace the following item(s):
- The part generating the strange noise
- Logic board
(1) Confirm cable connection (LCD FFC and panel
harness):
- Harness and connector conditions
- No cable breakage, etc.
(2) Replace the following item(s):
- LCD FFC
- LCD viewer unit
- Panel board
- Logic board
(1) Examine and remove any foreign material or paper
debris.
(2) Confirm the PF rear cover and the cassette
conditions.
(3) Confirm cable connection.
(4) Replace the following item(s):
- ASF unit (for paper feeding error from the rear
tray)
- PF pick-up unit (for paper feeding error from the
cassette)
- DF unit (for document scanning error)
- PE sensor board
- Pressure roller unit
- Cassette unit
(1) Confirm cable connection (scanner motor cable and
CIS FFC):
- Harness and connector conditions
- No cable breakage, etc.
(2) Replace the following item(s):
- Scanner unit
- Logic board
(1) Confirm the ink tank conditions:
- Confirmation of the air-through of an ink tank
- Re-setting of an ink tank
(2) Remove foreign material from the purge unit caps, if
any.
(3) Perform cleaning or deep cleaning of the print head.
(4) Perform print head alignment.
(5) Replace the following item(s):
*1
- Print head
- Logic board
- Purge drive system unit
18 / 64
Solution
, and ink tanks

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