The machine uses its DC controller to detect the presence/absence of a drum cartridge with reference to the primary charging AC bias detection signal (ANO_1).

The machine executes the detection when the power is turned on or when the front cover is closed, causing the DC controller to check the level of current of ANO_1

for individual drum unit.

If the result of detection indicates a level of the ANO_1 signal above a specific value, the DC controller will assume the absence of the unit in question, and at the

same time, notifies 'the absence of drum unit' on the touch panel.

[1] Primary charging roller

[2] Drum unit

7.5.1.3 Identifying a New/Old Drum Unit

/ / / / iR C3380i / iR C3380 / iR C2880i / iR C2880

This device does not have memory in the drum unit so, when a new drum is mounted, the drum life counter value stored in the printed needs to be reset.

The device detects old and new drum units, so that the counter can be reset.

The detection is performed by the DC controller CPU monitoring the fuse detection signal.

When the CPU detects that a new drum unit has been mounted, it outputs a fusing signal and blows the fuse on the drum unit. At the same time, the drum life

counter resets to 0.

The following shows the timing at which the machine executes the detection and the flow of detection:

1. Timing of Detection

at power-on, after the front cover is opened/closed

2. Flow of Operation

[2]

[1]

D-CON

CPU

EEPROM

HVT1

D-CON