If last rotation is under way in response to a rise in temperature at the film edge, the machine will hold cleaning until the end of the ongoing last rotation.

2. If a jam has been removed, the machine starts cleaning at time of recovery, at 220 deg C and for 10 sec.

9.3.4 Detecting the Passage of Paper

9.3.4.1 Detecting the Passage of Paper

iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /

The paper passage detection configuration in the fixing unit is shown below.

When a delay jam of the fixing delivery sensor (PS13) occurs, the fixing motor is stopped immediately so as to prevent paper from wrapping around the fixing roller.

The pressure of the fixing film and the pressure roller is released when a jam occurs so that jammed paper can be taken out easily.

9.4 Protective Functions

9.4.1 Protective Functions

iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /

As part of its protective mechanism, the machine has a thermo switch, triacs, and a relay. Protective measures according to location are described below:

1. When the thermistor is out of order

Software detects a failure, and the triac and the relay are turned off.

The thermo switch is turned off.

2. When the CPU goes out of control

The latch circuit detects the excessive temperature rise, and the relay is turned off.

The thermo switch is turned off.

3. When the triac short-circuits

Software detects failure, and the relay is turned off.

The latch circuit detects the excessive temperature rise, and the relay is turned off.

The thermo switch is turned off.

Protective Circuit Block Configuration Diagram

9-4