Canon multipass c3000 Service Manual (en)

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• Printing quality error (Evaluation criteria: Check the test print image's faults.)
• Print is not clear
(1) Paper has a correct side for printing.  If the print quality is not as clear as you
would like it to be, try turning the paper over and printing on the other side.
• Blurred or smudged characters
(1) If the printed characters are blurred or smudged, make sure you are using the
recommended paper.
• Smudges appear on back of printed page
(1) If ink happens to get on the printer's platen, the back side of the printed page will
have smudge marks.  If this occurs, clean the platen by feeding a few sheets of
paper through the printer.
• Irregular print quality
(1) If white streaks appear on the printed page or dots are missing in the printed
output, clean the BJ head.  The printer automatically cleans the BJ head when
you follow these steps:
Press the 
FUNCTION
button and select 
CLEANING
menu.
• Print head needs cleaning
(1) Paper dust or ink may get clogged in an ink nozzle in the BJ cartridge.  Performing
the BJ head cleaning procedure should clear up this problem.
The printer automatically cleans the BJ head when you follow these steps:
Press the 
FUNCTION
button and select 
CLEANING
menu.
• Horizontal white stripes appear on some entirely black parts of the print
(1) Carry out nozzle cleaning on the BJ cartridge five times with the cleaning operation, 
then visually check the test print for non-discharge of ink from nozzles. (
Fig. 3-15
)
(2) Remove and reinstall the BJ cartridge.
(3) Replace the BJ cartridge.
(4) Check the connection of the carriage ribbon cable and the PCNT board (J1).
(5) Replace the carriage ribbon cable.
(6) Replace the PCNT board.
Part 1: Facsimile
3-28
Missing dots
Unstable printing
Splashed dots
Figure 3-15 Defective Pattern (Sample)