Electrical Adjustments
SM3226-1 – 10FEB97
5–27
Output Voltage for Receivers PT1, PT2, and PT3
This procedure is done to ensure the necessary output voltages are correct for the DRIVER BOARD to convert to a
TTL level used at the SEQUENCE BOARD. It will be necessary to check this output when changing film
manufacturers, replacing sensors and/or DRIVER BOARD.
To Check:
[1] Connect the Channel A and the Channel B GROUND CLIPS to CPG5.
[2] Connect the Channel A OSCILLOSCOPE PROBE to the correct TEST POINT:
Note
This gives the analog output of each FILM JAM SENSOR.
• PH2 for the SLOW SCAN FILM SENSOR
• PH3 for the FILM PROCESSOR ADAPTER FILM SENSOR
• PH1 for the TRANSPORT GUIDE PLATE FILM SENSOR
[3] Set the Time Base to 2 ms/division.
[4] Set the voltage to 1 volt/division.
[5] Connect the Channel B OSCILLOSCOPE PROBE to the correct TEST POINT:
Note
This shows the TTL levels for each FILM JAM SENSOR as converted by the DRIVER BOARD.
• PHT2 for the SLOW SCAN FILM SENSOR
• PHT3 for the FILM PROCESSOR ADAPTER FILM SENSOR
• PHT1 for the TRANSPORT GUIDE PLATE FILM SENSOR
[6] Set the Time Base to 2 ms/division.
[7] Set the voltage to 1 volt/division.
Note
Use unprocessed film supplied by the customer.
[8] Observe the height of the waveforms on the OSCILLOSCOPE first without FILM and then with FILM inserted
between the EMITTER and RECEIVER of the SENSOR. If necessary, see the Component Locator for each
SENSOR location.
• Channel A
– With no film: More than +3.5 V p-p
– With film: Less than +1.5 V p-p
• Channel B
– With no film: 0 Vdc
– With film: 5 Vdc
