PRG Best Boy Field Service Manual - Manual (Page 66)

58 BEST BOY 4000 ® SPOT LUMINAIRE FIELD SERVICE MANUAL
Replacing a Zoom Sensor
The Zoom Assembly contains three Zoom Sensor PCBs (one for each Zoom Lens Group). This procedure provides
instructions for changing any one of the three sensors.
Note that one (1) Zoom Sensor PCB is located on the top side of the Head Assembly (under the R1 cover) and two (2)
Zoom Sensor PCBs are located on the bottom side of the Head Assembly (under the R2 cover).
Parts:
24.9812.0510 / 2.3749A-P40 3 EA PCB ASSY, ZOOM SENSOR
Tools & Supplies:
#2 Philips screwdriver
#1 Right-angle Philips screwdriver or #1 Philips screwdriver, as required
WARNING: Remove power from luminaire before performing any maintenance procedures.
CAUTION: Always use anti-static precautions when working with PCBs.
To replace a zoom sensor:
Step 1. Remove power from luminaire.
Step 2. Remove Head Covers. (Refer to "Removing Head Covers" on page 24.)
CAUTION: NEVER touch or adjust the brass spring-loaded standoff. It is set at the factory.
Step 3. To remove Zoom Sensor 1:
a. Remove R2 Head Cover. (Refer to "Removing Head Covers" on page 24.)
b. At Zoom Sensor, disconnect cable from header (Figure 3-32).
c. Remove Zoom Sensor by removing two 2-56 x 3/16" PPSS screws.
Step 4. To remove Zoom Sensor 3:
a. Remove R2 Head Cover. (Refer to "Removing Head Covers" on page 24.)
b. At Zoom Sensor, disconnect cable from header (Figure 3-32).
c. Remove Zoom Sensor by removing two 2-56 x 3/16" PPSS screws.
d. Remove two 3/16" Hex Standoffs from Zoom Sensor PCB and install on new Zoom Sensor PCB.
Step 5. To remove Zoom Sensor 1:
a. Remove R1 Head Cover. (Refer to "Removing Head Covers" on page 24.)
b. At Zoom Sensor, disconnect cable from header (Figure 3-33).
c. Remove Zoom Sensor by removing two 2-56 x 3/16" PPSS screws.
Step 6. Replace a Zoom Sensor by doing steps in reverse. Apply Loctite 222 to all screws.