Philips VARI*LITE VL1100 ERS Luminaire, Service Manual

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AINTENANCE
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Gobo Index Timing Belt Alignment
The index timing belt (54.9663.1220) must be aligned so that the mechanism "clocks"
properly. This belt is installed around the index gear and top gear of the gobo wheel
(refer to
Figure 2-11 ). The wheel position belt (54.2045.0002) is installed around the
wheel position gear and bottom gear of the gobo wheel, and does not require
alignment. Each belt is also routed around one pulley as shown in
Figure 2-11 .
Note: The alignment procedure is the same for both arc and incandescent versions.
Use the following procedure to re-align the index timing belt in the event it slips or the
gobo wheel is removed from the bulkhead. (This procedure assumes that the wheel has
been removed from the bulkhead assembly. If you are simply re-aligning the belt, Step
2 can be skipped.)
To align index timing belt:
Step 1. At large gear, align one of Index Timing Belt’s clock marks with small
groove at inside of Index Gear. The Index Timing Belt contains two clock
marks (two ridges) as seen in Figure 2-10 .
Figure 2-10: Aligning Index Gear Groove and Clock Mark
(Ridge)
Index Gear (Larger Gear)
Arc Gobo
Index Timing Belt
Belt Clock Mark
Bulkhead
Index Timing Belt
Ridge Ridge
(Groove)
Gear Clock Mark