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4447-20x
2. Diagnostic information
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CAUTION
Unplug power cord from the electrical outlet before you connect or disconnect any cable or
electronic board or assembly for personal safety and to prevent damage to the printer.
Disconnect any connections between the printer and PCs/peripherals.
The diagnostic information in this chapter leads you to the failing part. Before you replace an entire assembly,
determine if just the defective part is available in the parts catalog. Use the error code tables, symptom table,
service checks, and the Diagnostic aids chapter to determine the symptom and repair the failure. The removal
procedures in the Repair information chapter may help you identify parts. After you complete the repair, perform
the appropriate tests to verify the repair.
Initial check
Before you start troubleshooting, check the following:
Installation environment
•
The power supply line voltage is plus or minus 10% of the rated line voltage.
•
The machine is securely installed on a level surface in a well-ventilated place.
•
The room temperature is between 10 and 32°C (50 and 90°F) and the relative humidity between 20 and
80%.
•
Avoid sites generating ammonia gas, high temperature, high humidity (near water faucets, kettles,
humidifiers), cold spaces, near open flames, and dusty areas.
•
Avoid sites exposed to direct sunlight.
Print paper checks
•
Use the recommended paper for this printer.
•
Check for paper dampness. Make a trial print with paper from a newly opened package, and check the
result.
2-1
Service Manual
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