Canon BJC-55 Service Manual page 187

BJC-50
5. Print Defect <2>
White Streakes
Appear.
<Measure>
Check the conditions for
using the printer and
printing paper
specifications.
Do they
meet the
specifications?
Yes
Remove and reinstall
the BJ cartridge.
Do a test print.
Is the test
result bad?
Yes
1. Replace the ink
cartridge.
2. Replace the BJ
cartridge.
Does the
print defect
persist after
BJ cartridge
replacement?
Yes
Check conductivity of the
carriage ribbon cable.
Is it broken?
Yes
Replace the print unit.
<Symptom>
• The print is blurred.
• White streaks appear.
<Cause>
The BJ cartridge, carriage ribbon cable, purge unit, or
paper feed unit is defective (missing gear teeth).
No
Use printing paper that
meet the specifications.
Do a Demonstration pattern print.
Hold down the POWER button until the beeper sounds once and
manual feed a sheet of paper. Press the RESUME button to print
out the Demonstration pattern.
No
END
No
END
29
1
No
1. Replace the printer
base unit.
2. Replace the print unit.
• The carriage unit or carriage ribbon cable is defective.
5-27
Part 5: Maintenance
White Line Sample
Troubleshooting consists of error
diagnosis, which is required if the
is unknown, and error recovery, wh
if the cause of an error is known.
an error is unknown, perform the
diagnosis, and if it is known, perfo
recovery.
• The purge unit is defective.
• The purge drive unit is defective.
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