3Scanning Problems; Scanning Problems - Canon MultiPASS MP390 Service Manual

Missing dots
Unstable printing Splashed dots
F-5-1
Blotched appear
Blank ink appear
(1) Remove and reinstall the printhead.
(2) Perform printhead cleaning, and visually check the test print for non-discharge of ink from nozzle.
(3) Perform head-refreshing, and visually check the test print for non-discharge of ink from nozzle.
(4) Replace the appropriate ink tank.
(5) Replace the printhead.
(6) Check the connection of the carriage ribbon cable and the SPCNT board (JHEAD1, JHEAD2).
(7) Replace the carriage unit.
(8) Replace the SPCNT board.
(9) Replace the purge unit.
Missing dots
Unstable printing Splashed dots
F-5-2

5.4.3 Scanning Problems

Scanning problems
CCD Motor does not work.
(1) Check the connection between the CCD motor and SPCNT board (JCCD2).
(2) Replace the scanner unit.
(3) Replace the SPCNT board.
The scanning image is abnormal. (Evaluation criteria: Check the copy image's faults).
Nothing is printed.
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Chapter 5
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