Canon MX882 Service Manual page 7

Faulty scanning (no
scanning, strange noise).
Machine not recognized by a
USB-connected computer.
Unsatisfactory No printing, or no color
print quality ejected.
Faint printing, or white lines
on printouts.
Uneven printing.
Improper color hue.
Paper gets smeared.
The back side of paper gets
smeared.
- Document feed unit
- Cassette unit
(1) Confirm cable connection:
- Scanner motor cable
- CIS FFC
=> No incomplete connection, cable breakage, or cable
caught in units
(2) Confirm the internal conditions under the platen glass (no
damper displaced or caught in units).
(3) Replace the following item(s):
- Scanner unit
- Logic board ass'y
(1) Confirm the USB cable connection.
(2) Connect the machine to another computer via the USB
cable, and check if the machine is recognized.
(3) Replace the following item(s):
- USB cable
- Logic board ass'y
See 3-6. Special Notes on Servicing, (1) For smeared printing,
uneven printing, or non-ejection of
(1) Confirm the ink tank conditions:
- No remainder of the outer film (the air-through must be
opened)
- Whether the ink tank is Canon-genuine one or not
- Whether the ink tank is refilled one or not
- Re-setting of an ink tank
(2) Remove foreign material from the purge unit caps, if any.
(3) Confirm the conditions of the carriage head contact pins.
(4) Perform cleaning or deep cleaning of the print head.
(5) Perform print head alignment.
(6) Replace the following item(s):
*1
- Print head , and ink tanks
- Logic board ass'y
- Purge drive system unit
- Carriage unit
(1) Clean the inside of the machine.
(2) Perform bottom plate cleaning.
(3) Perform paper feed roller cleaning.
(4) Replace the following item(s):
- Pressure roller ass'y (if smearing is heavy)
*1
- Print head (when smearing is caused by the print head)
(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):
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ink, for details.