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02.9628.0010
7-Oct-97
Step 3.
Rock truss hook back and forth in direction parallel to corner of
chassis. This allows cross pins in truss hook to bend tabs in
fastener back to allow removal of hook. Push hard on truss
hook to make this happen. Tabs in fastener are bent over and
must be bent back into position to allow removal of hook.
Step 4.
When tabs are bent back into position, truss hook will come
out.
Step 5.
Replace truss hook fastener.
a. For power supply side fastener, remove power supply
(Figure 3-27).
b. For low voltage supply and universal control PCB side
fastener, remove PCBs (Figure 3-31).
c. For other fasteners, remove yoke bearing frame by doing
the following:
1. At each electronics chassis air filter, while pressing
down on filter, pop out top of filter from chassis and
remove filters.
2. Remove eight 6-32x5/16"PPB screws that secure two
top covers to chassis and remove covers.
3. At card retainer, press down on spring release and open
retainer.
4. Pull out low voltage power supply PCB and universal
control PCB.
5. At bottom of chassis, in countersink, remove
6-32x5/16"PPB screw securing power supply.
6. Pull out power supply.
7. Remove voltage selector PCB (Figure 3-29).
8. At yoke bearing frame, remove four 6-32x5/16"PPB
screws that secure frame to flanges on top of chassis.
9. 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).
10. Pivot end of yoke bearing frame closest to transformer
away from transformer and disconnect eight-pin MTA
connector from motherboard header marked MB-P7.
11. While holding up luminaire head with one hand, reach
under yoke bearing and disconnect both black, 26-pin
connectors from motherboard marked YOKE A MB-P4
and YOKE B MB-P5.
12. Remove yoke bearing frame from chassis.
Step 6.
At bottom of chassis, carefully peel off chassis foot cover
covering damaged fastener and save chassis foot cover.
C
3. M
HAPTER
AINTENANCE
3-101
P
ROCEDURES
CONFIDENTIAL
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