3-132
V
ARI
*L
ITE®
-
VL2B
AND
VL2C
S
POT
L
UMINAIRE
S
ERVICE
M
ANUAL
CONFIDENTIAL
02.9631.0010
15 Jan 98
Step 13.
Using oscilloscope, measure output of pan servo driver
amplifier. Screw head securing TO-220 output driver transistor
(Q3, Q4) to heatsink serves as testpoint. This is common
collector output of servo drive amplifier.
Step 14.
Change setting on oscilloscope to 0.1 volt per division for final
adjustment.
Step 15.
Adjust pan trimpot for stable reading of 0.0 ± 0.1 VDC at servo
driver amplifier output. Make adjustment until oscilloscope
trace is flat at 0.0 volts.
Step 16.
Set thumbwheel to 001 and run pan test for 3 minutes. Then
set thumbwheel back to 000 and recheck pan null adjustment.
Step 17.
Repeat Steps 10 through 15 for tilt servo driver amplifier.
Screw head securing TO-220 output driver transistor (Q7, Q8)
to heatsink serves as testpoint. This is common collector
output of servo drive amplifier.
Step 18.
Set thumbwheel to 002 and run tilt test for 3 minutes. Then set
thumbwheel back to 000 and recheck tilt null adjustment.
Step 19.
When calibration is complete, disassemble oscilloscope and
return luminaire to operation by doing Steps 2 through 9 in
reverse.
