MX-PNX1C (serv.man12). Section 10 - Electrical Section . - Sharp Copying Equipment Service Manual (repair manual). Page 11

MX-FNX1/MX-PNX1  ELECTRICAL SECTION  10 – 11

c. Transmission type sensor circuit
1)

LED circuit

This circuit is composed of the paper rear edge sensor
(FPPEND) on the inner punch circuit and the light emitting
(LED) circuit of the paper horizontal resist sensors (FPPD1 –
6) circuit.
Turning ON/OFF of LED1 – 7 are controlled by the paper rear
edge sensor (FPPEND) and the paper horizontal resist sen-
sors (FPPD1 – 6) circuit.

2)

Photo transistor (PTR) circuit

This circuit is the light receiving (PTR) circuit of the paper rear
edge sensor (FPPEND) and the paper horizontal resist sensor
(FPPD1 – 6) circuit on the inner punch circuit. When light is
received from the LED, the collector signal flows through PT1
– 7.