3-76
V
ARI
*L
ITE®
-
VL2B
AND
VL2C
S
POT
L
UMINAIRE
S
ERVICE
M
ANUAL
CONFIDENTIAL
02.9631.0010
15 Jan 98
b. Disconnect four-pin MTA100 connector of stepper motor
from header crimped to pan-motherboard cable.
Step 4.
Remove pan mechanism from luminaire.
a. At pan mechanism, remove one 10-32x7/8"PPB screw and
black #10 flat washer from floating-nut plate.
b. Remove three 10-32x1-1/2"PPB screws, #10 flat washers,
and 10-32 KEPS nuts that secure legs of pan mechanism to
lid of upper enclosure (screws are threaded into chassis lid).
c. Free belt from pan mechanism and remove pan mechanism
from pan/fan housing.
Step 5.
Install replacement pan mechanism in luminaire.
a. Fit belt from driven pulley to drive pulley of pan mechanism.
b. Insert replacement pan mechanism into pan/fan housing.
c. Fit #10 black flat washer to 10-32x7/8"PPB screw and
thread screw into blue grommet on pan and pan/fan housing
(top side) and into floating nut of pan mechanism.
d. Apply Loctite 242 to three 10-32x1-1/2"PPB screws and
insert screws into top of chassis lid and through blue
grommets into legs of pan mechanism. Secure screws in
place with #10 flat washers and 10-32 KEPS nuts.
e. Connect four- and five-pin IDC connectors to pan-
motherboard cable assembly.
Step 6.
Adjust tension of pan mechanism belt.
a. Tighten belt adjustment screw and then check tension of
belt (Figure 3-21).
b. Rotate pulleys back and forth. At same time, slowly tighten
adjustment screw until both tension and feed sides of belt
are taut (1/8” deflection desired).
c. Using finger, check deflection of belt when not in motion.
Visual observation of belt may not detect over-tightened
belt.
Step 7.
Reassemble luminaire.
a. Secure pan cover to pan/fan housing using 14, 4-
40x5/16"PFZ screws.
b. Secure chassis lid to electronics chassis using six 10-
32x3/8"PPB screws.
