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6-32X5/16"PPB SCREW
MOTHERBOARD
MB-P8
YOKE B MB-P5
YOKE A MB-P4
Figure 3-41. Yoke Bearing Frame Removal and Replacement
02.9628.0010
7-Oct-97
Step 15.
Remove voltage selector PCB (Figure 3-29).
Step 16.
Remove yoke bearing frame (Figure 3-41).
a. At yoke bearing frame, remove four 6-32x5/16"PPB screws
that secure frame to flanges on top of chassis.
b. At bottom of chassis, remove five or six 6-32x5/16"PPB
screws that secure yoke bearing frame to chassis bottom
(depending on year of manufacture, luminaire was
constructed with either five or six bottom retaining screws).
c. Pivot end of yoke bearing frame closest to transformer away
from transformer and disconnect 8-pin MTA connector
from motherboard header marked MB-P7.
d. While holding up luminaire head with one hand, reach under
yoke bearing and disconnect black, 26-pin connector from
motherboard marked YOKE A MB-P4. Connector is
located next to connector marked YOKE B.
e. At rear of chassis, behind power supply, disconnect 26-pin
black connector from motherboard header marked YOKE B
MB-P5.
f. Remove yoke bearing frame from chassis.
PAN MB-P7
C
3. M
HAPTER
AINTENANCE
6-32X5/16"PPB SCREW
(FIVE OR SIX SCREWS
MAY BE USED)
3-105
P
ROCEDURES
YOKE BEARING
FRAME
ELECTRONICS
CHASSIS
YBFTB
CONFIDENTIAL
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