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2420 FIELD HOSPITAL SURGICAL LIGHT
6. Repair
REMOVING LIGHTHEAD/YOKE ASSEMBLY
Disconnect or turn OFF power to the light
or intensity control to avoid hazardous
electrical contact.
CAUTION)
1 .
Remove the lighthead switch cover.
Secure
wires from lighthead and from
Support arm to avoid wire ends slipping
into castings.
2.
Disconnect ground line wire nut.
3.
Disconnect hot and neutral wires from ON/OFF
switch.
4.
Break loctite and loosen lighthead setscrew.
The support arm will spring upward when
lighthead is removed. Secure arm to pre-
CAUTION
vent pivot movement.
10.
11.
12.
Refer to Adjustment
B in Section 2 to correct
any lighthead rotational drift.
Crimp on new flat terminals to support arm
wires (Part No. 65199). Connect line (black) and
neutral (white) wires to ON/OFF Switch. Refer
to Figure 16.
Connect hot and neutral wires (blue and brown)
to ON/OFF switch. Refer to Figure 16.
Connect ground
wires. Wrap wire nut with tape.
Check
lighthead
for correct
operation
and
rotation.
REPLACING LAMP CONTACT
Disconnect or turn OFF power to the light
or intensity control to avoid hazardous
electrical contact.
Use Repair Package 67501
for this Procedure.
Package consists of the contact with wiring, retain-
ing ring, two flag terminals and sleeving.
de
Remove lens, heat filter, back cover and switch
plate.
=
Su
2.
Disconnect ground wire from heat dissipation
en
N
plate.
Se
3.
Remove cable clamp from heat dissipation
SWITCH
plate.
4.
Disconnect lighthead wires from ON/OFF tog-
gle switch. Cut flag terminals from wires.
5.
Lift gasket from yoke to expose contact wires.
Lift wires from yoke.
SEGMENT
6.
Remove three plate mounting screws and guide
heat plate along the sleeve. Do not move
or
adjust focus screws at this time.
CONTACT
PLATE MOUNTING
WIRES
SCREW
Figure 17. REMOVING LIGHTHEAD/YOKE
SE
5.
Remove yoke pin and stop segment. Separate
yoxe
GROUND
lighthead from support arm.
'SCREW
6.
Cut flag terminals from yoke wires.
g9
KW
GASTON
Stop segment must be in place to prevent
i
i
FOCUS
over rotation of yoke and lighthead.
W
Pilot
CLEARANCE HOLE
E
7.
Replace lighthead in reverse order ot removal.
DESA
Refer
to
Figure
17
for
placement
of spring
PLATE
washer. Apply Loctite #222 and tighten yoke pin
until rotational drift is eliminated.
Figure 18. LAMP CONTACT WIRING
14
DATE: 9/87
30840
REPLACES: 2/85
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