SERVICE MANUAL
5–28
10FEB97 – SM3226-1
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 pulses are present, do the Pulse
Cycle Adjustment procedures beginning on Page 5-34.
[11] De-energize the LASER PRINTER.
[12] Remove the OSCILLOSCOPE PROBE.
8-10 ms
Channel A
Channel B
PH1 (-2,-3)
3.5 - 4.0 Vp-p
0 Vdc
PHT1 (-2,-3)
NO FILM PRESENT
0V
H129_2714BC
Analog output of
Film Jam Sensors
with no Film Present
TTL Logic level Low (0 Volts)
Channel A
Channel B
PH1 (-2,-3)
< 1.5 Vp-p
~ 5 Vdc
PHT1 (-2,-3)
FILM PRESENT
Analog output of
Film Jam Sensors
with Film Present
TTH Logic Level High (5 Volts)
0V
8-10 ms
5V
H129_2715BC
