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TM 9-4110-257-14
4-30. DEFROST TIMER TM1 TESTING AND REPLACEMENT.
This task covers: a. Testing b. Removal c. Installation
INITIAL SETUP
Materials/Parts:
Equipment Conditions:
Lock Washers (2)
Refrigeration unit shut down (para 2-7) and
1, Appendix G
battery disconnected (para 4-35).
Self Locking Nut (2)
Control panel cover door raised and latched.
8, Appendix G
Tie Down Strap
23, Appendix E
General Safety Instructions:
Marker tags (7)
7, Appendix E
WARNING
Exposed rotating parts are used in the
refrigeration unit. Personal injury can result if battery
is connected.
a.
Testing. (See Figure 1-4.)
(1) Be sure battery has been disconnected and remove two bolts (I) and lock washers (2). Open control panel
(3). Discard lock washers.
(2) Remove and discard tie down strap (4).
(3) Pull defrost timer (5) from relay mounting socket (6).
(4) Using multimeter set to measure continuity, check defrost timer (5) continuity between terminals 1 to 7.
Continuity should be indicated. If no continuity was indicated, replace defrost timer.
(5) Using multimeter set to measure continuity, check defrost timer (5) continuity between terminals 4 to 7 and 6
to 9. No continuity should be indicated. If continuity was indicated, replace defrost timer.
(6) If relay mounting socket (6) is damaged, replace it.
(7) If no failure was indicated, push defrost timer (5) into relay mount socket (6) and install new tie down strap
(4).
(8) Close control panel (3) and install two new lock washers (2) and bolts (1).
b.
Removal.
(1) Be sure battery has been disconnected and remove two bolts (1) and lock washers (2). Open control panel
(3). Discard lock washers.
(2) Remove and discard tie down strap (4).
(3) Pull defrost timer (5) from relay mounting socket (6).
4-76
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