Oce 3121 Technical & Service Manual page 333

LED Display
LED1 Use it to check the output of the original tray paper sensor.
LED2 Use it to check the output of the registration sensor.
LED on the RDF Control PBA
Display
TP1-1
TP1 -2
TP1 -3
TP1 -4
TP1 -5 +5V
Earth
TP1 -6
Test Pins on the RDF Control PBA
Checking the output of the paper sensor in the document tray and the out-
put of the registration Sensor
The output from the various sensors requires checking, in the following cases:
- if the RDF control PBA has been replaced
- if the paper sensor in the document tray has been replaced
- the registration sensor has been replaced.
Check that the output of each sensor is correct, as the light source and the light
destination are on separate components.
Procedure:
Switch OFF.
1
Shift bit 4 to ON: DIP switch (DSW1) on the RDF control PBA.
2
Switch ON.
3
With no paper on the document tray, press once on the switch (SW3) on the
4
RDF.
Check that LED1 and LED2 have switched on, on the RDF control PBA.
5
Check that voltage of TP2-1 and TP2-2 is 1.1 ±0.1 V. If the voltage is incorrect,
check the position of the sensor. The alignment of the light source and the light
destination of the sensor may be wrong.
ed.1 10 RDF 331