Lubrication; Replacing Fuses - Martin MAC 250 ENTOUR User Manual

2. Wash dirty lenses and filters with isopropyl alcohol 99.9%. A generous amount of regular glass cleaner
may also be used, but no residues may remain.
3. Rinse with distilled water. Mixing the water with a small amount of wetting agent such as Kodak Photoflo
will help prevent streaking and spotting.
4. Dry with a clean, soft and lint-free cloth or blow dry with compressed air.
F A N
To maintain adequate cooling it is important that the fan be cleaned regularly. It can be cleaned with a soft
brush, vacuum, or compressed air.

Lubrication

The MAC 250 Krypton/Entour does not require lubrication under normal circumstances. The slides and
spindle for the focus lens car are lubricated with a long-lasting Teflon-based lubricant that can be reapplied
by a Martin service partner in the unlikely event that this should be necessary.

Replacing fuses

M A I N F U S E
The main fuse holder is built into the mains input socket. Never replace the fuse with one of a different
rating!
To replace the main fuse:
1. Unplug the mains cable from the input socket.
2. Pry open the fuse holder and remove the fuse.
3. Replace the fuse with one of the same type and rating. The fuse rating is listed on serial number label.
4. Close the fuse holder and replace the mains cable.
P O W E R S U P P L Y F U S E S
There are two fuses for the low-voltage power supplies located on the printed circuit board. If one or more of
the green LEDs on the PCB does not light, one of these fuses may be blown. If all three LEDs are lit, the
low-voltage power supplies are functioning correctly.
To replace the low-voltage fuses:
1. Disconnect the fixture from AC power.
2. Remove the left-side yoke cover (when looking at the head in the text in the upright position from the
back as indicated in the illustration) to access the PCB.
3. Carefully remove and check the two fuses located in the bottom of the PCB (see "Circuit board
connections" on page 47). Replace as necessary with fuses of the same size and rating (see page 48).
Service 31