TM 9-4120-370-14
TO 35E9-229-1
5-20. COMPRESSOR (B1) - Continued.
(b) Check that jumper between heater halves is secure. Check jumper for continuity. If continuity is not
indicated, repair or replace jumper.
(c) Check continuity between P21 contact D and heater terminal A and contact E and terminal B. If
continuity is not indicated, repair or replace wire leads.
(d) Check continuity between heater half terminals. If continuity is not indicated, replace heater.
(e) Check heater (HR8) for visible damage, missing terminals or terminal covers, and secure attachment
of clamping hardware.
Continuity check thermostat (S10) at connector P21 in accordance with following chart.
(f)
CONTINUITY SHOULD BE INDICATED
TEMPERATURE
Contact
Contact
Contact
AT S10 THERMOSTAT
A to C
B to C
A to B
NO
NO
YES
Above 70 8F
(21.1 4.4C)
YES
NO
NO
Below 50 5F
(10 2.8C)
Thermostat actuates at 70 8F (21.1 4.4C) and reset at
50 5F (10 2.8C)
If the thermostat fails any of the above tests check that splices are properly installed. Repeat above test. Replace thermo-
stat (S10) if bad.
(4) Check compressor (B1), motor protector (S4), heater (HR7), and thermostat (S8) as follows:
(a) Disconnect P11 connector and harness from J11 connector located on compressor junction box.
(b) Remove wing nut from compressor junction box cover and pull junction box cover from compressor.
(c) Check that all wire connections are secure and in good condition.
(d) Using multimeter, check continuity between connector (J11 ) contacts D to E, D to F, and E to F. Conti-
nuity should be indicated. If continuity is not indicated, check that wires are properly connected. If
wires are properly connected and continuity is still not indicated, replace compressor.
5-35
