Replacing A Rotating Gobo - Martin Exterior Projection 500 User Manual

Replacing a rotating gobo

Gobos are user-replaceable, and you can replace them with custom gobos made to your own
design. Gobos are exposed to severe thermal stresses, so custom gobos must meet the
specifications and quality standards of the Martin gobos supplied with the fixture (see 'Gobos' on
page 54), or they can lead to damage that is not covered by the product warranty. Borosilicate
glass gobos are recommended for long-term use, but for shorter periods it is possible to use gobos
constructed in aluminum 1060.
The dark side of glass gobos and the painted side of aluminum gobos must face away from the
LEDs and face towards the front of the fixture.
To help with designing custom gobos when projection requirements are very specific, order the
Projection Setup Gobo (see below) from Martin and use it to map projection characteristics at the
installation site. You can then give precise data to the gobo designer to use as a guide.
Projection Setup Gobo for the Exterior Projection 500, P/N 91616068
Gobos 1 – 4 are printed/coated glass and share the same specifications, but gobos 5 and 6 are
structured glass and have different specifications to the others. See 'Gobos' on page 54.
Goboholders 5 and 6 are not interchangeable with any other goboholders and must always be
installed in the slot they came from. Textured glass gobos must be installed in goboholders 5 and
6, and you must reinstall the thrust washers supplied with gobos 5 and 6 between the gobo
retaining spring and the gobo.
See illustration below. The goboholder in slot 4 has a magnet (arrowed) that the fixture uses to
recognize the position of the gobo wheel and gobos. If you replace gobos, make sure that you
always install this goboholder in its original position in slot 4.
34 Exterior Projection 500 User Manual