Panasonic KX-MB771GR Service Manual page 43

6.12.1. DRUM DETECTION
DRUM SENSOR is not arranged.
DRUM unit is detected when HVERR SENSOR arranged in H.V.P.S becomes effective.
6.12.2. PICKUP SENSOR
Paper SENSOR is not arranged.
Paper is detected when PICKUP SENSOR described as follows becomes effective.
This Switch detects whether a recording paper is picked up or not, and whether Rear Cover is opened or closed.
When there is a recording paper at the position of the switch, the input signal of IC300-AE20pin becomes low level.
When there is no recording paper at the position of the switch, the input signal of IC300-AE20pin becomes high level.
High Voltage ERROR Status
Abnormal
Normal
Pickup status
A paper exists
No papers
Drum sensor
DRUM can not be detected Low level
DRUM can be detected
Idling status Signal (IC300-AE20pin)
Rear Cover opened Low level
Rear Cover closed High level
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Signal (IC300-P26)
High level
KX-MB771GR