Unsatisfactory Print Quality - Canon PIXMA MG5220 Service Manual

Unsatisfactory print quality

Faulty scanning (no scanning,
strange noise).
Machine not recognized by a
USB-connected computer.
No printing, or no color ejected.
Faint printing, or white lines on
printouts.
Uneven printing.
Improper color hue.
2 / 62
(5) Replace the following item(s):
- ASF unit (for paper feeding error from the
rear tray)
- Pick-up arm unit (for paper feeding error
from the cassette)
- PE sensor board ass'y
- Pressure roller unit
- PE sensor cable
- Cassette unit
(1) Confirm cable connection:
- Scanner motor cable
- CIS FFC
=> No incomplete connection, cable
breakage, or cable 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 3-5. Special Notes on Servicing, (1) For
smeared printing, uneven printing, or non-
ejection of ink, for details.
(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.