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  TM 55-4920-431-13
Refer to wiring diagram, figure FO-2. Disconnect P4 from analog converter.
c.
Connect 28 vdc to unused terminal of LOCAL/REMOTE switch S6. Connect
ground lead to ground buss indicator lights. Check continuity as follows:
P4-A
to
-
P4-E
to
J2-H
post
M2
P4-K
to
+
post
M2
P4-F
to
J2-G
P4-G
to
+
post
M1
P4-C
to
J3-G
P4-H
to
-
post
M1
P4-D
to
J3-H
d. Replace relay if defective (para 4-19).
Reconnect P4 to analog convertor.
harness - P5. Refer to schematic diagram, figure FO-1, and check each wire.
4-15. Replacement.
The following paragraphs describe procedures for replacement
of components.
Lampholder Replacement.
a.
Gain access to inside of case per paragraph 4-7.
b.
Unscrew electrical connector to lamp holder (21, figure 5-2) and remove.
c.
Loosen retaining nut on lamp holder and remove nut.
d.
Remove lampholder from panel.
e.
Install replacement lampholder into panel.
Install retaining nut on lampholder and tighten.
f.
Remove top of lampholder and install lamp. Reinstall onto base.
g.
h.
Reinstall front panel and case lid.
Binding Post Replacement.
a.
Gain access to inside of case per paragraph 4-7.
b.
Unsolder wires from binding post (10 or 11, figure 5-2).
c.
Remove retaining nut mounting binding post to panel. Remove binding
post and insulator from panel.
d.
Install replacement binding post with insulator onto panel. Install retain-
ing nut and tighten.
e.
Solder wire leads to binding post.
f.
Reinstall panel and case lid.
4-15
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