Harman Martin MAC Ultra Performance, Safety And Installation Manual

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Service and maintenance
25
Replacing a gobo in a goboholder
The rotating gobos in the MAC Ultra Performance are held in their holders by springs and can be removed
from their holders as described in this section.
Gobo orientation: general
Make sure that you install gobos facing in the correct direction, or they may suffer heat damage. The
orientations shown in Figure 18 are correct in most cases, but consult your Martin dealer or gobo supplier if
you are in any doubt about the orientation of a specific gobo type.
Coated Glass Gobos
The heavy matted aluminum coated borosilicate gobos in the MAC Ultra Performance are
factory-installed with the more reflective sides facing towards the LED light source.
Replacement gobos must also be installed with more reflective sides facing the LEDs in
order to avoid heat damage.
More reflective side towards LEDs
To minimize the risk of gobo overheating
and damage, turn the more reflective side of
a coated gobo towards the lamp.
Less reflective side away from LEDs
The less reflective side of a coated gobo will
absorb less heat if it faces away from the
lamp.
Textured Glass Gobos
Flat side towards goboholder
If you install a textured glass gobo in the fixture, note that a textured glass gobo sits most
squarely in a goboholder with the flat side placed down into the recess in the goboholder. If
in doubt, consult your Martin dealer or gobo supplier. We recommend that textured glass
gobos are glued into the goboholder.
Image / text Gobos
True image towards LEDs Reversed image away from LEDs
Gobos that have a specific left/right orientation (such as text gobos) will appear correctly in
the projection if they appear correctly when viewed from the side that faces towards the
LED light source.
Figure 18. Correct gobo orientation
abc abc
abc abc