Electrical Adjustments
SM3226-1 – 10FEB97
5–47
Emitter Pulse Duty Ratio for Sensors IL1, IL2, and IL3
Duty Cycle Ratio is defined as percent of time the SENSORS are on divided by the percent of time the SENSORS
are off.
Lower the Duty Cycle Ratio if film fogging has occurred. Adjusting the 3 SWITCHES changes the ratio of emitter
time per cycle. The Duty Ratio may need to be changed when non-Kodak films are used.
Note
The switches RSW1 and RSW2 on the DRIVER BOARD are factory-set to 8 for a Duty Ratio of 60%. RSW3 is
factory set to 3 for a Duty Ration of 28 percent.
PHT2, IL1 - RSW2: for the SLOW SCAN FILM SENSOR
PHT3, IL2 - RSW3: for the FILM PROCESSOR ADAPTER SENSOR
PHT1, IL3 - RSW1: for the TRANSPORT GUIDE PLATE FILM JAM SENSOR
Note
If changing the Duty Ratio, select one of the following switch settings to select the percent shown:
* Not recommended.
Important
If you are changing the Duty Ratio, the Output Voltage for Receivers will need to be checked. Adjust as ncessary.
DRIVER BOARD
[1] Change the switch settings for each sensor by trial and error until the film-fogging problem is cleared. Use the
Flat Field procedure on Page 4–21 to check the image after setting the duty ratio.
[2] Check the receiver output voltage for PT1, PT2, or PT3 after changing the switch setting. See the procedure
on Page 5-46.
Switch Setting
Duty Ratio
Switch Setting
Duty Ratio
*0
9.4%
8
60%
*1
16%
9
66%
2
22%
*A
72%
3
28%
*B
78%
4
34%
*C
84%
5
41%
*D
91%
6
47%
*E
97%
7
53%
*F
100%
