Canon BJC 50 Service Manual - Page 145

Canon BJC 50 - Color Inkjet Printer Manual

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BJC-50 Part 5: Maintenance 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 Operation Judgement Action/Replace Jump Stop 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. 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. Is there any spur mark? Yes No END Replace the print unit. • Spur or the carriage is defective. 5-5

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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:
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
5-5
BJC-50
Part 5: Maintenance
Start/End
Operation
Judgement
Jump
Stop
Action/Replace
Clean the spurs in the
paper delivery unit.
Is there any
spur mark?
Replace the print unit.
No
Yes
Do a test print.
END
•
Spur or the carriage is defective.
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.