Martin MAC 500 Service Manual page 7

6. Remove the tilt-sensor circuit board.
7. Remove the bottom row of 5 screws from both sides of the yoke base and lift off the yoke.
2 . 3 . 3 I
N S T A L L Y O K E O N B A S E
1. Set the base on a work table with the circuit-board side facing you.
2. Turn the yoke base fully clockwise to the mechanical stop; then turn it back 270° counter-clockwise.
3. Arrange the wires. Lay the bundle with the sensor, fan, rotating-gobo, gobo wheel 1, color wheel 2, dimmer, and
tilt motor and reset switch wires to the left (as the fixture faces you). Lay the bundle with the focus, iris, prism,
rotating prism, color wheel 1, and gobo wheel 2 along with the bundle of 3 lamp wires (black, blue, and yellow/
green) to the right.
4. Tie the wire bundles to the base using the pair of holes on each end. The wires can be damaged by the shaft
collar if they are tied too tightly. They are too tight if, with power off, there is increased resistance or a slight
spring action at the extremes of the pan range.
5. Find the side of the yoke with the plastic lamp wire connection block. Place the yoke on the base with the con-
nection block on the right side. Install the 10 screws that hold the yoke to the base.
6. Connect all wires on both sides of the yoke. When connecting the tilt reset switch wires, it makes no difference
which wire is on top. Replace the tilt-sensor circuit board under the tilt motor.
7. Tie the wire bundles together where they pass the tilt motors. Do not tie them to the arm. Replace the plastic
arm covers.
1998-08-03
Figure 2-1
Parts Removal and Installation 5