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SERVICE MANUAL
PHT1 (-2,-3)
Channel B
~ 5 Vdc
PH1 (-2,-3)
Channel A
< 1.5 Vp-p
To Adjust:
[9] Rotate the correct POTENTIOMETER for each sensor until the value is within specification.
PHT2: VR1 for the SLOW SCAN FILM SENSOR
PHT3: VR2 for the FILM PROCESSOR ADAPTER FILM SENSOR
PHT1: VR14 for the TRANSPORT GUIDE PLATE JAM SENSOR
[10] Check that Channel B SENSORS show a steady DC level with no pulses. If the Channel B SENSORS show a
steady DC level, the film SENSORS are adjusted correctly.If pulses are present, do the Pulse Cycle Adjustment
procedures beginning on Page 5-16.
[11] De-energize the LASER PRINTER.
[12] Remove the OSCILLOSCOPE PROBE.
5–12
FILM PRESENT
5V
0V
8-10 ms
Oscilloscope Connection to Driver Board
Channel B
Channel A Ground Point
PHT2
PHT3
PHT1
PH2
CPG5
PH3
CPG5
PH1
CPG5
TTH Logic Level High (5 Volts)
Analog output of
Film Jam Sensors
with Film Present
H129_2715BC
Adjustment
Potentiometer
VR1
VR2
VR14
10FEB97 – SM3226-1
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