Ricoh CH-C1, Service Training

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492
Ch-C1 Training
Slide 492
Fusing Temperature Control - Diagram

This graph shows how temperature changes in the fusing
unit.

Target temperatures can be adjusted with SP mode for
various paper types.
1. Start-up, Restart-up: The machine detects that all covers (doors) are closed
and then starts the fusing warming-up. The machine controls the fusing
motor, the IH heater, and the pressure roller fusing lamp to increase the
fusing temperature up to the target temperature.
2. Rotation after Reload: After fusing warming-up finishes, the fusing motor
turns on for a certain time to keep the fusing temperature at a specified level
(adjusted with “SP1107-001: Heating R”, “SP1107-002: Pressure R”).
3. Before Paper Passing: The machine increases the temperature of the hot
roller and of the pressure roller to reach “Paper Passing-start Temperature”.
4. While Paper Passing: While paper is passing through the machine.
5. After Paper Passing: After the last sheet of a job passes the fusing exit
sensor, the machine controls the fusing motor, IH heater, and the pressure
roller fusing lamp to keep the target temperature (target temperature is
adjusted with “SP1108-001: Heating R”, “SP1108-002: Pressure R”).
6. Ready: When the “After Paper Passing” state finishes, the machine turns to
the “Ready” state. The machine controls the fusing motor, the IH heater, and
the pressure roller fusing lamp in order to maintain the fusing temperature
(can be adjusted with “SP1107-001: Heating R”, “SP1107-002: Pressure R”)
7. Low Power Mode: A specified time passes after fusing reload, and then the
IH heater and fusing motor turn off. At the same time, the pressure roller
fusing lamp turns on in order to keep the target temperature (can be adjusted
with “SP1107-006”) of the pressure roller.
8. Sleep Mode: A specified time (normal: 1 minute) passes after the machine
turns to the “ready” state, and then the machine cuts power supply for the IH
heater, the pressure roller fusing lamp, and the fusing motor.