Troubleshooting; Overview Of Troubleshooting; Definition; Precautions For Troubleshooting - Canon BJC-55 Service Manual

BJC-50

5. TROUBLESHOOTING

5.1 Overview of Troubleshooting

5.1.1 Definition

Troubleshooting consists of error condition diagnosis, which is required if the cause of
an error is unknown, and error recovery, which is performed if the cause of an error is
known. If the cause of an error is unknown, perform the error condition diagnosis,
and if it is known, perform error recovery.

5.1.2 Precautions for troubleshooting

1. Before starting error condition diagnosis, make sure all the connectors and ribbon
cables are plugged in.
2. If you repair the printer with its case removed and the Universal adapter or battery
pack installed, take utmost care to prevent electric shock from the power supply
unit and PCB shorting.
3. Troubleshooting procedures are given in flowcharts. The following symbols are
used in the flowcharts:
Start/End
4. After replacement or repair, do a test print to make sure the printer works properly.
If the printer does not work properly, perform troubleshooting again, skipping the
steps that were done before.
Example 1
Clean the spurs in the
paper delivery unit.
Do a test print.
Is there any
spur mark?
Yes
Replace the print unit.
Judgement
Operation
Do a Demo pattern print.
Hold down the POWER button until the beeper sounds once and
manual feed a sheet of paper.
Press the RESUME button to start Demo pattern print.
No
END
• Spur or the carriage is defective.
Action/Replace
5-5
Part 5: Maintenance
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