Ilt Modules; Ain Circuit Board - Martin MAC 500 Service Manual

5. Thread the focus belt over the back roller, under the motor, and over the front roller. Stretch the belt to the posi-
tion you marked earlier and secure under the angle bracket. With the focus mechanism all the way to the rear,
the belt should deflect about 3 mm (1/8") when pressed lightly between the roller and angle bracket. Adjust the
tension if focus movement is choppy.
2 . 9 T
I L T M O D U L E S
2 . 9 . 1 R
E M O V E T I L T B E L T
1. Remove the head from the yoke bearing on the side to be serviced. See procedure 2.3.1.
2. Remove the 6 screws holding the tilt assembly to the arm.
3. Slide the belt off the large gear.
2 . 9 . 2 R
E P L A C E T I L T B E L T
1. Put the belt on the small gear, then the large gear.
2. Replace the tilt assembly on the yoke.
3. Locate the mechanical stop bolt on the large gear. Turn the gear until the stop bolt is at the bottom.
4. Place the head in the yoke with the lens pointing up and the side with the ground connector (E in Figure 2-1) to
the right.
5. Make sure the holes in the yoke bearing spacer ring align with the holes in the tilt gear and reinstall the head on
the bearing.
2 . 9 . 3 R
E M O V E T I L T M O T O R
1. Remove tilt belt on side to be serviced. See section 2.9.1.
2. If removing the motor on the tilt sensor side, remove the sensor bracket.
3. Loosen the set screws.
4. Remove the gear from the motor shaft.
5. Remove the motor.
2 . 9 . 4 I
N S T A L L T I L T M O T O R
1. Install the tilt motor with the wires hanging down, towards the base.
2. Put the gear on the motor shaft. Do not tighten the set screws.
3. If installing the motor on the tilt sensor side, install the sensor bracket. Center the timing wheel in the sensor.
4. Tighten a set screw slightly to fix the gear along the shaft. The gear must be able to rotate on the motor shaft
when it is synchronized with the other motor.
5. Install the tilt belt.
6. Synchronize the tilt motors. See procedure 3.10.
2 . 10 M
A I N C I R C U I T B O A RD
2 . 1 0 . 1 R
E M O V E C I R C U I T B O A R D
1. Unplug the connectors from the top of the circuit board.
2. Lifting by the 2 black pins on the ends, pull the board partially out.
3. Unplug remaining connectors and remove the board.
10 MAC 500 1998-08-03