SECTION 5
MEASUREMENTS & ADJUSTMENTS
42
Troubleshooting Tips:
1) If the sensor signal (Senor LEDs or voltage at I/O Board) is NOT switching check the following:
a) Check the sensor connection to the I/O board.
b) Check to be sure the sensor and reflector are clean.
c)
Check the angle of the reflector (could be bent).
d)
Check the intensity adjustment on the sensor.
e) Replace the sensor, reflector and bracket (cover) that the reflector attaches to.
2) If the sensor signal (Senor LEDs or voltage at I/O Board) is switching, but the Toolbox, Scan
Sensors condition does not change (with paper present/not present) check the following:
a)
Check/measure the Paper Feed Sensor output at S4 (J9) on Interface (I/O) board. This can be
done by connecting meter between GND and TP4. You should measure ~0 VDC when the
Paper Feed Sensor is uncovered (not interrupted, no paper present). You should measure ~ 7.5
VDC when the Paper Feed Sensor is covered (interrupted, paper present).
If readings are OK, then Paper Feed Sensor signal in and out of the I/O Board is good.
If readings are BAD, then Paper Feed Sensor wiring/connection to the I/O Board is bad or the
I/O Board is bad.
b)
Check/measure the Paper Feed Sensor output at J703 on the Main PC Board (Z3 and higher
print engines). This can be done by connecting meter between the two wires of J703.
You should measure ~0 VDC when the Paper Feed Sensor is uncovered (not interrupted, no
paper present). You should measure ~ 7.5 VDC when the Paper Feed Sensor is covered
(interrupted, paper present)
If readings are OK, then Paper Feed Sensor signal to the Main PC Board is good. This would
indicate a problem on the Main PCB. Replace Main PCB.
If readings are BAD, then there is a problem with connection or wiring between the I/O Board
and Main PC Board. Check wiring/connections.
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