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Test Point R149, R150
-5 Volt Position
Sensor
Mexico
+5V
1
M e c h a n i c a l A d j u s t m e n t s
1.
Remove the back panel cover from the projector to access the tension sensor mechanism.
2.
Apply power and keep the projector in NOT READY mode. In the relaxed position, the arm activates a limit switch,
which will short the sensor output to the +15-volt supply. This switch should activate when the arm is relaxed to
within one inch of the rubber stop.
3.
Remove the disk sensor cover.
4.
Loosen the locking screws so that the sensor assembly can be moved with respect to the disk. (See Figure 6.2.)
5.
Loosen the set screw holding the disk to its shaft.
6.
Turn R2 to the maximum counter-clockwise position; then turn it back a quarter-turn.
7.
Hold the torque arm in its mid-travel position. The test point for the upper torque arm is at the top of R150 on the
2293 CPU/Main Logic card, and the test point for the lower torque arm is on the top of R149.
a.
Rotate the upper optical disk so that the widest part of the disk is pointed upwards, and secure the disk. Note
that the widest portion of the disk corresponds to one of the four tapped set screw holes in the disk.
b.
Rotate the lower optical disk so that the widest part of the disk is pointed downwards, and secure the disk.
c.
Move the sensor bracket until a reading of 0 volts is obtained and secure the bracket.
d.
Verify that the voltage at R149 and R150 varies by approximately ±5V as the torque arm is moved to extremes.
Minor adjustments to R2, the sensor bracket, and the sensor disk may be required to obtain the correct voltage
fluctuations.
e.
Secure all set screws and install light cover.
CHRISTIE
CHRISTIE
35/70 Service/PM Manual
March, 1997
Tension Adjust
Rotate Disk to Set Range
Lock set screw behind
Disk.
Cllector
EMITTER
-LED
+LED
R2
R1
1K
68
GND
+15V
3
5
8
13
21
Figure 6.2: Tension Sensor Adjustment for Reeling System.
Do not allow the voltage fluctuation to exceed ±8V, as this may activate the torque arm
limit circuit.
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
Test Point R149, R150
0 Volt Position
Use Fine Adjust to Position
Sensor with respect to Disk.
Locking Screws
Adjust for 0 volts in center position
Sensor
Test Point R149, R150
R2
Limit Switch
Test Point R149, R150
+5 Volt Position
Limit Switch
CONTRACT NO.
SIMI
, CALIF.
APPROVALS
DATE
Tension Sensor
DRAWN BY:
CHECKED BY:
SIZE
FSCM NO.
DWG. NO.
REV.
ISSUED BY:
SCALE
SHEET
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