MartinLogan MAC 500/E - Manual (Page 25)

25 Maintenance and Basic Service
O p t i m i z i n g l a m p a l i g n m e n t
The lamp alignment is set at the factory. If, the light distribution is uneven, lamp alignment may be adjusted as follows.
A 3 mm Allen wrench is required.
1. Disconnect the fixture from AC power supply and allow the lamp to cool for 15 minutes.
2. Make a preliminary adjustment: remove the lamp assembly and turn the 3 lamp adjustment
screws to position the lamp-socket plate a distance of 38 mm (1.5”) from the access plate (out-
side measurement) as shown. Replace the lamp assembly.
3. Switch on the MAC 500/E and allow it to reset. Using either a controller or the control panel,
strike the lamp and focus the light on a flat surface.
4. Center the hot-spot (the brightest part of the beam) by turning the 3 adjustment screws. Turn
one screw at a time to drag the hot-spot diagonally across the projected image. If there is no
hot-spot, adjust the lamp until the light is even.
5. To reduce a hot-spot, pull the lamp in by turning all three screws clockwise 1/4-turn at a time
until the light is evenly distributed.
6. If the light is brighter around the edge than it is in the center, or if light output is low, the lamp is
too far back in the reflector. “Push” the lamp out by turning the screws counterclockwise 1/4-turn
at a time until the light is bright and evenly distributed.
I n s t a l l i n g t h e o p t i o n a l h e a d s h e l l s a f e t y w i r e
An optional wire (P/N 50300502) for secondary attachment of the
plastic shells is available. Two wires are required per fixture. The
wire has a closed loop at one end and a hook at the other end. To
secure the shell:
1. Remove the head shells as described above.
2. Place the closed loop under a washer and screw in the
lamp housing counterweight as shown. Replace the
washer and screw and tighten well.
3. Loop the wire around a cross rib between the shell
ventilation slots and hook the wire to itself. Do not
attach the hook directly to the plastic rib.
M a i n t e n a n c e s c h e d u l e
The maintenance schedule will depend heavily on the application and should be discussed with your Martin techni-
cian. Cleaning, lubricating and servicing the fixture is best left to a qualified technician. He has the knowledge, experi-
ence, tools, lubricants and other materials required to keep the MAC 500/E performing at its best.
lamp adjustment screws (3 mm Allen)