TM 9-4110-254-14
4-37. 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)
High voltage and exposed rotating parts are
Sleeving Insulation (1 Each Push Switch)
used in the refrigeration unit. Personal injury
can result if power is connected
Marker tags (2 Each Push Switch)
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 push button switch out and pushed m. Continuity should only be indicated with the
switch pushed m. If continuity was not indicated when switch was pushed in or was indicated with
switch out, replace push switch.
NOTE
Smaller diameter sleeving insulation must go over wire lead connecting to
push switch terminal C
(4)
If no failure was indicated, 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 m place using heat gun.
4-83