TM 9-4110-258-13
4.30 PUSH SWITCHES S6 AND S7 TESTING AND REPLACEMENT.
This task covers:
a. Testing
b. Removal
c. Installation
INITIAL SETUP
Tools:
Equipment Conditions:
Heat Gun
3, Section III, Appendix B
disconnected.
Both side doors open
Materials/Parts:
General Safety Instructions:
Self Locking Nuts (2 Each Push Switch)
WARNING
Sleeving Insulation (1 Each Push Switch)
Sleeving Insulation (1 Each Push Switch)
High voltage and exposed rotating parts are
used in the refrigeration unit. Personal injury
Marker Tags (4)
can result if power is connected.
a.
Testing.
(1) Remove sleeving insulation (1).
(2) Tag and disconnect wire leads (2).
(3) Using multimeter set to measure continuity, check push switch (3) contact continuity across terminals C
and NO with the button out and pushed in. Continuity should only be indicated with the button pushed in.
If continuity was not indicated when button was pushed in or was indicated with button out, replace push
switch.
NOTE
Smaller diameter sleeving insulation must go over wire lead connecting to push switch terminal C.
(4) If no test indicated a failure, install insulation sleeving (1) over wire leads (2).
(5) Using tags and wiring diagram (fig. 1-4), connect wire leads (2). Remove tags.
NOTE
Sleeving insulation covers only terminal C on one side of push switch, but must cover both
terminals NO and NC on the other side.
(6) Slip sleeving insulation (1) over exposed terminals and shrink in place using heat gun.
b.
Removal.
(1) Remove sleeving insulation (1).
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