PRG Bad Boy Field Service Manual - Manual (Page 91)

BAD BOY ® SPOT LUMINAIRE FIELD SERVICE MANUAL 83
Step 4. Remove Pan Shield by removing two 6-32 x 3/8" PFSS black screws and four 6-32 x 1/4" PPZ SEMS
screws (Figure 3-39).
Step 5. At Pan/Tilt Controller PCB, disconnect Tilt Drive Assembly cable harness.
Step 6. At Tilt Drive Assembly, loosen (but do not completely remove) four 10-32 nylon insert nuts (Figure 3-42).
This will begin to loosen the belt.
Step 7. Release belt tension by loosening two belt adjustment screws and slip belt off of tilt pulley.
Step 8. Remove four 10-32 nylon insert nuts and four #10 flat washers from Tilt Drive Assembly.
Step 9. Remove Tilt Drive Assembly from yoke.
Step 10. Replace Tilt Drive Assembly by doing steps in reverse.
Step 11. Set proper belt tension. Refer to "Setting Pan/Tilt Belt Tension" on page 83.
Setting Pan/Tilt Belt Tension
Loose pan/tilt drive belts can create calibration problems. When the luminaire reaches the end of travel, excess belt
slack can produce a vibration causing the encoder to continue producing a movement output signal to the processor
(even though the luminaire is at its stop).
When properly set, the belt should not show bilateral deflection. Bilateral deflection may be observed by loosening the
tension adjustment bolt(s) and rotating the head assembly. As the head is rotated back and forth, tension is created
on one side and deflections are created on the other.
There are two ways to set proper belt tension:
1) Using a Sonic Tension Meter (recommended).
2) By manually tightening until no bilateral deflection is present.
When using the Sonic Tension Meter, it will be necessary to program separate presets for the Pan and Tilt Drive belts
as follows:
Tools:
7/16" open-ended wrench, or
Sonic Tension Meter, Model 507C (07.3082.1052.0)
CAUTION: Do not overtighten belt, pulley will break and/or bearings will fail.
To set belt tension using a meter:
Step 1. Set Pan and Tilt presets on the Tension Meter as given above.
Step 2. Orient head as shown in Figure 3-43 on next page.
Step 3. Slowly tighten belt adjustment bolt(s). Use Tension Meter to verify correct tension.
Preset Belt Mass
Width
(mm)
Span
(mm)
Tension
(lbs.)
1 Pan Drive 4.1 15 109 80-100
2 Tilt Drive 4.1 15 326 80-100