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
CHRISTIE
CHRISTIE
35/70 Service/PM Manual
March, 1997
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.
Do not allow the limit switch to be activated while making this adjustment.
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.
Do not touch belts or other moving parts in the projector while making 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.
