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  TM 55-4920-431-13
With switch toggle in down position, the VOM should read infinite ohms.
2.
With switch toggle in up position, the VOM should read zero ohms.
Move VOM - lead to switch (S1) upper terminal. The VOM should read
3.
infinite ohms.
The VOM should read zero ohms.
Move switch toggle to down position.
4.
Disconnect VOM.
5.
d.
Test LOCAL/REMOTE Switch (S6).
1.
Unsolder wire no. 52 at switch.
Connect VOM + lead to switch (S6) center terminal and - lead to switch
2.
(S6) lower terminal.
With switch toggle in down position, the VOM should read infinite ohms.
3.
With switch toggle in up position, the VOM should read zero ohms.
4.
Disconnect VOM and resolder wire no. 52 to lower terminal of switch
(S6).
test in accordance with the troubleshooting procedures in Section III.
(DS1 and DS2) should light. Isolate trouble to wiring or lamp holder. Repair wir-
ing (para 4-27) or replace lamp holder (para 4-16), as required.
blown. If blown, replace fuses (para 4-20).
Test Relay.
Perform continuity test of relay (K1) as follows:
a.
Gain access to inside of case per paragraph 4-7.
Set VOM to OHM scale X1. Zero VOM.
Refer to wiring diagram, figure FO-2.
b.
Check continuity as follows:
J2-X
to
J2-H
-post
M2
to
J2-c
J2-Y
to
J2-G
to
+post
M2
J2-d
J2-T
to
J3-G
to
+post
M1
J2-e
J2-U
to
J3-H
to
J2-t
-post
M1
NOTE
Remove power between checks. Only (K1)
is energized for following test.
4-14
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