Diagnostic information
CAUTION—SHOCK HAZARD: Remove the power cord from the electrical outlet before you connect or
disconnect any cable or electronic card or assembly for personal safety and to prevent damage to the printer.
Disconnect any connections between the printer and PCs/peripherals.
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.
Troubleshooting overview
Performing the initial troubleshooting check
Before you start the troubleshooting procedures, perform the following checks:
• With the power cord unplugged from the wall outlet, check that the cord is free from 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
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.
• 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.
4 The control panel indicator light switches from solid amber to solid green. The display resets, and then a line of
dots appear.
5 The cooling fan turns on.
6 The fuser heater turns on.
Note: The fuser takes longer to warm up from a cold start than a warm start.
7 The main drive motor turns on.
4514-420, -430
Diagnostic information
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