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f.
Issue a REVERSE TEST MODE (<G>,<8>) command to set upper and lower Torque arm pots (See Section
0).
8.
Use a spring scale to pull the torque arm to the center position. The scale should read 32 ounces for 70-mm film.
Disconnect the spring from the torque arm. Use the tension adjustment screw to achieve the correct reading.
9.
Reattach the spring to the torque arm.
10. Replace the back panel of the projector.
E l e c t r i c a l A d j u s t m e n t s
The initial settings of pots R136, R137, R183, and R196 on the 2293 CPU card are set for 11½ turns clockwise after
adjusting the pots completely counter-clockwise.
1.
With the projector powered up and in READY, enter the REVERSE TEST MODE (<G>,<8>) command.
2.
Enter a speed value of 10 on the keypad.
3.
Adjust R183 so that the upper torque arm sensor voltage (as measured from the top of R150) is 0 volts ± 1 volt. This
adjusts upper torque arm position.
4.
Adjust R136 so that the upper torque arm sensor voltage (as measured from the top of R149) is 0 volts ± 1 volt. This
adjusts lower torque arm position.
5.
Repeat steps 3 - 5 with speed values of 20, 30, 40, 50, 60, 70, and 80.
6.
Enter a speed value of 00 to stop the projector.
7.
Press the <STOP> button.
8.
Enter 00 to change the projector direction to forward.
9.
Press the <STOP> button.
10. Repeat steps 3 to 8, using R196 for the upper torque arm and R137 for the lower torque arm.
11. Enter the DISPLAY FRAME COUNTER (<G>,<1>) command to return the display to normal.
Shutter Timing Adjustment (2269 Encoder)
The shutter encoder outputs an index pulse each time the shutter blade completely blocks the light from the lamphouse.
The index pulse must be adjusted so that the film stops before the shutter opens. The projector must be running for this
adjustment.
1.
Open the back cover and locate the shutter encoder at the back of the shutter motor.
2.
Loosen the Phillips head screws holding the encoder mounting bracket to the back of the shutter motor.
3.
Enter a FORWARD command (the <FOR> key).
4.
Open the douser.
5.
Rotate the encoder by hand until the picture is ghost-free.
6.
Tighten the Phillips head screws.
This completes the shutter adjustment.
CHRISTIE
CHRISTIE
35/70 Service/PM Manual
March, 1997
Do not allow the limit switch to be activated while making this adjustment.
Do not touch belts or other moving parts in the projector while making this adjustment.
6 : M e c h a n i c a l a n d E l e c t r o n i c A d j u s t m e n t s
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