Canon PIXMA MG6120 Service Manual page 6

Unsatisfactory print quality
Faulty scanning (no scanning,
strange noise).
No printing, or no color ejected.
Faint printing, or white lines on
printouts.
Uneven printing.
Improper color hue.
Paper gets smeared.
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- 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 relay harness ass'y
- CIS cable
=> No incomplete connection, cable
breakage, or cable caught in units
(2) Replace the following item(s):
- Scanner unit
- 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)
- Re-setting of an ink tank
- Whether the ink tank is Canon-genuine
one or not
- Whether the ink tank is refilled one or not
(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 , and ink tanks
- Logic board ass'y
- Purge drive system 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 unit (if smearing is heavy)
*1
- Print head (when smearing is caused by