Major Hardware Changes - Martin MAC 500 Service Manual

s e c t i o n 6
MAJ OR HA RDWA RE CHANG ES
S/N for
Implementation
Harder dimmer/shutter
980515-000
The dimmer/shutter blade with adaptor has P/N 817391. Note: 2 dimmer blades are needed for each
MAC 500.
New prism rotation belt
We are implementing a more reliable belt to drive prism rotation (not prism flag in/out). The original
980512-000
belt softens at high temperatures and can break over time.
The new belt has part number 372301.
Balance plates
The achromatic lenses now being used in the MAC 500 are heavier than the first lenses used. To
counterbalance the additional weight, two 3 mm thick steel plates are being fastened to the top and
bottom of the lamp housing, just in front of the quarter-turn fasteners.
980403-000
A few users have experienced step loss on pan and tilt with the achromatic lenses. The problem is not
universal, but if you do experience it, it can be solved by installing these plates (2 x P/N MVI01903) -
one on top and one on the bottom of the lamp housing. Step loss can also be caused by the pan or tilt
motors not being synchronized.
New gobo-holder spring
A new gobo-holder spring has been implemented that makes it easier to change rotating gobos. The
new spring has a bend on one end that allows the user to remove the spring with small pointed
980320-000
(needlenose) pliers.
For upgrading existing fixtures, the new spring may be ordered as P/N 373968; five springs are
required per fixture. Extra gobo holders may be ordered as P/N MUI058.
New lenses
The MAC 500 is now being produced with anti-reflection coated achromatic lenses. The new focus
980130-000
and front lenses provide sharper focus and less color distortion. The beam angle is still 17°.
An upgrade kit to replace the previous lenses is available as P/N 850094.
24
Changes
MAC 500 1998-08-03