Diagnostic Information; Troubleshooting Overview; Performing The Initial Troubleshooting Check; Power-On Reset (Por) Sequence - Konica Minolta bizhub 4020 Service Manual

4. Diagnostic information

CAUTION—SHOCK HAZARD: Remove the 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.
CAUTION—POTENTIAL INJURY: The printer weight is greater than 18kg (40 lb) and requires
two or more trained personnel to lift it safely. Use the hand holds on the side of the printer. Make sure
your fingers are not under the printer when you lift or set the printer on the floor or another stable
surface.
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.

4.1 Troubleshooting overview

4.1.1

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.
4.1.2

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.
2. The control panel display turns on.
3. A splash screen appears on the display.
4. The cooling fan turns on.
5. The fuser heater turns on.
Note: The fuser takes longer to warm up from a cold start than a warm start.
bizhub 4020/3320 Service Manual
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