Lexmark MS312, Service Manual

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Diagnostics and troubleshooting
CAUTION—SHOCK HAZARD: For personal safety and to prevent damage to the printer, remove the
power cord from the electrical outlet before you connect or disconnect any cable, electronic board or
assembly.
CAUTION—HOT SURFACE: The inside of the printer might be hot. To reduce the risk of injury from a hot
component, allow the surface to cool before touching it.
Troubleshooting overview
Performing the initial troubleshooting check
Before you start the troubleshooting procedures, perform the following checks:
•
Use genuine Lexmark supplies and parts for the best results. Third-party supplies or parts may affect the
performance, reliability, or life of the printer and its imaging components.
•
With the power cord unplugged from the electrical outlet, check that the cord is free from the breakage,
short circuits, disconnected wires, or incorrect connections.
•
Make sure the printer is properly grounded. Check the power cord ground terminal.
•
Make sure the power supply line voltage is within 10% of the rated line voltage.
•
Make sure the machine is securely installed on a level surface in a well
‑
ventilated area.
•
Make sure the room temperature is between 16 and 32°C (60 and 90°F) and that the relative humidity is
between 8 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.
•
Make sure the paper is the recommended paper for this printer.
•
Make a trial print with paper from a newly opened package, and check the result.
Power
‑
on Reset (POR) sequence
When you turn the printer on, it performs a POR sequence.
Check for correct POR functioning of the base printer by observing the following:
1
The control panel indicator light turns on (solid red, then solid amber).
2
A line of dots appear on the display.
3
[x] MB [y] MHz
appears on the display.
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Diagnostics and troubleshooting
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