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Canon MX860 Service Manual page 22

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Faulty scanning
Network connection problem No printing.
FAX problem
*1: Replace the print head only after the print head deep cleaning is performed 2 times, and when the problem persists.
Paper gets smeared.
The back side of paper gets smeared. (1) Clean the inside of the machine.
Graphic or text is enlarged on
printouts in the carriage movement
direction.
Graphic or text is enlarged on
printouts in the paper feed direction.
No scanning.
Streaks or smears on the scanned
image.
No FAX sending or reception.
<2. LIST OF ERROR DISPLAY / INDICATION>
(1) Clean the inside of the machine.
(2) Perform bottom plate cleaning.
(3) Perform paper feed roller cleaning.
(2) Perform bottom plate cleaning.
(3) Examine the platen ink absorber.
(4) Examine the paper eject roller.
(5) Replace the following item(s):
- The part in the paper path causing the smearing
(1) Confirm that the carriage slit film is free from
smearing or scratches:
- Cleaning of the timing slit film.
(2) Replace the following item(s):
- Timing slit film
- Carriage unit
- Logic board
- Scanner unit (for copying)
(1) Confirm that the LF / EJ slit film is free from
smearing or scratches:
- Cleaning of the LF / EJ slit film..
(2) Replace the following item(s):
- LF / EJ slit film
- LF / EJ timing sensor unit
- Platen unit
- Logic board
- Scanner unit (for copying)
(1) Replace the following item(s):
- Scanner unit
- Logic board
(1) Clean the platen glass and the document pressure
sheet.
(2) Confirm the position of the document pressure
sheet.
(3) Replace the following item(s):
- Scanner unit
- Document pressure sheet
- Logic board
(1) Examine if printing is performed properly via USB
connection.
(2) Confirm the network settings.
(3) Replace the following item(s):
- Logic board (for wired / wireless LAN)
- WLAN board (for wireless LAN)
(1) Confirm the FAX settings.
(2) Replace the following item(s):
- Modular board
- Logic board
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