162 Theory of operation ENWW
Transfer (ITB) unit detection
The printer detects the presence of the transfer unit.
The DC controller monitors the waste toner full sensor (PS13) and color misregistration sensor
(PS12) during initial rotation for detection of the ITB unit.
At the start of a print operation, the DC controller lets the PS12 and PS13 emit light. If the transfer
unit is present, the LED light is received at the light receivers on the sensors, and vice versa.
If neither the PS12 or the PS13 receives light, the DC controller judges that the “transfer unit is not
present, OUT” and sends an error message to the formatter.
Figure 5-46 Transfer unit detection
Note If light is received only at one of the light receivers on the PS12 or P13, it will not be judged as ITB
unit OUT, but will be judged as the following errors.
Error in the PS12 only: Color misregistration sensor abnormality or,
Error in the PS13 only: Waste toner full warning
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