Canon mp628 Service Manual page 14

Unsatisfactory print quality
Faulty scanning
Network connection problem No printing.
*1: Replace the print head only after the print head deep cleaning is performed 2 times, and when the problem persists.
No printing, or no color ejected.
Faint printing, or white lines on
printouts.
Uneven printing.
Improper color hue.
Paper gets smeared.
The back side of paper gets smeared.
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. (1) Clean the platen glass and the document pressure sheet.
<2. LIST OF ERROR DISPLAY / INDICATION>
(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
(proper removal of the orange tape)
- 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):
- Print head
- Logic board
- Purge drive system unit
(1) Clean the inside of the machine.
(2) Perform bottom plate cleaning.
(3) Perform paper feed roller cleaning.
(1) Clean the inside of the machine.
(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
(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)
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*1
, and ink tanks