Fuser Control; Fuser Temperature Control; Fuser Warm-Up; Fuser Trouble (U4 Error Code) - Oki B6100 Technical Manual

Fuser Control

Fuser Temperature Control

The Thermistor monitors the temperature on the surface of the Heat Roll and compares that temperature
with the rated temperature that was set in NVRAM. The Controller switches the Heat Rod on or off depend-
ing on how the actual temperature differs from the rated temperature.
The printer switches on the Heat Rod when the Fuser temperature lowers below the current control tem-
perature (approximately 178
Rod when the Fuser temperature rises above the current control temperature (approximately 180
the standard control temperature).

Fuser Warm-up

Power to the Heat Rod is applied at the start of printer warm-up. Warm-up is complete when the Heat Roll
reaches the current control Temperature. If the Fuser Temperature is below 100
then warm-up finishes when the Fuser temperature reaches "standby temperature", minus 10

Fuser Trouble (U4 Error Code)

There are five major causes of a U4 error.
•
Warm-up failure
Fuser warm-up does not complete within specified seconds after starting.
•
Low Trouble temperature
The Fuser temperature drops to the Low Trouble temperature (approximately current control temper-
ature, minus approximately 25
•
High Trouble temperature
The Fuser temperature rises to the High Trouble temperature (approximately current control tempera-
ture, plus approximately 35
•
The Thermistor circuit opened.
•
STS failure
The Heat Rod remains on for at least ten seconds after warm-up has completed.

Power Shutoff to the Fuser

There are eight major reasons that the printer shuts off power to the Fuser .
•
Fuser trouble (U4)
•
Paper jam
•
Open Cover Assy Front
•
ROS failure (U2)
•
CPU or NVRAM problem (U6)
•
Motor Assy Main problem (U1)
•
Fan problem (U5)
•
FUSER PAUSE command issued
OKI B6100 Laser Printer - Base Engine Technical Manual
Version 1.0
°C for the standard control temperature). The printer switches off the Heat
°C
).
°C
).
Principles of Operation
°C for
°C
at start of warm-up,
°C
.
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