Diagnostic Information; Start; Initial Check - Lexmark C920 Service Manual

2. Diagnostic information

Start

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.
If an error is displayed, locate it in the
messages" on page
If an error message appears while you are working on the printer, go to the error message table and take the
indicated action.
Warning: Do not use a RIP board or operator panel from another C920 for diagnosing problems or errors on
the printer being serviced. This can damage the machine.
CAUTION: Unplug power cord from the printer or 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 printer
requires at least two people to lift it safely. Make sure your fingers are not under the printer when
you lift or set the printer down.
CAUTION: If the printer is kept on, never touch the conductive parts while it is not specifically
required. Do not touch the LVPS cards and the motor driver board unless they are properly
discharged. Never touch the live parts.
Warning: When operating the driving units using the diagnostics or other tools, be sure to keep them covered
unless otherwise specified.
Warning: When operating the driving units using the diagnostics or other tools, never touch the driving units.
When operating the driving units using diagnostics or other tools, be sure to follow the procedures
in this manual.
CAUTION: Be careful to avoid burns by safely handing hot parts.
Warning: Servicers should wear a wrist band or the like to remove static electricity from their body, grounding
their body while working. Go to

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.
"Service error message tables" on page
2-30, or the "Symptom table" on page 2-3,
"Handling ESD-sensitive parts" on page 4-1
2-5, the "Attendance
and take the appropriate action.
Diagnostic information
5056-XXX
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