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TM 5-4120-287-15
(n) Remove 28 vdc power supply from K103 terminals 4 and 8; then replace jumper J (fig. 1-9).
(4) Line contactor relays (K104, K105, K106 and K107).
NOTE
The operation of the four line contactor relays are identical; therefore one set of instructions are given to
cover all line contactor relays.
(a) Remove 28 vdc power supply leads from rectifier (CR1) terminal C and transformer (T1) terminal 6.
(b) Check for an open condition across relay terminals Al and A2, B1 and B2, and C1 and C2.
(c) If continuity is exhibited across any one of the three terminal sets, the relay is defective and must be replaced.
(d) Apply 28 vdc across relay terminals 1 and 2.
(e) Check for continuity across relay terminals Al and A2, B1 and B2, and C1 and
C2.
(f)
If continuity is not exhibited across any one of the three terminal sets the relay is defective and must be
replaced.
6-10.
Electrical Tray Assembly Repair
a.
Disassembly. Disassemble electrical tray assembly in numerical sequence as illustrated in figure 6-3.
Remove hardware only as required to replace defective part.
b.
Repair and Inspection.
(1) Using a light stream of clean, dry compressed air remove all dirt and dust from electrical tray assembly.
(2) Replace defective parts with new parts.
(3) Check replaced electrical tray assembly component in accordance with paragraph 6-9.
c.
Reassembly. Reassemble electrical tray assembly in reverse of numerical sequence as illustrated in figure 6-
3.
Section IV. MOTORS AND HEATER ASSEMBLY
6-11.
General
The motors and heater assembly operate at line voltage. Remove and test only the suspected faulty component.
6-12.
Removal
a.
Remove evaporator motor (para 5-23 a).
b.
Remove condenser fan motor assembly (para 5-21 a).
c.
Remove motor compressor assembly (para 5-20 a).
d.
Remove heater assembly (para 5-25 a).
6-13.
Testing
NOTE
The Testing of the three motors and the heater assembly is identical, therefore only one set of instructions
are given.
a.
Place the motor, or heater assembly to be tested on a workbench.
b.
Apply working voltage directly to motor or heater assembly.
c.
If the motor, or heater assembly does not function, it must be replaced with a new unit.
6-14.
Replacement
a.
Replace evaporator motor (para 5-23 b).
b.
Replace condenser fan motor assembly (para 5-21 b).
c.
Replace motor compressor assembly (para 5-20 b).
d.
Replace heater assembly (para 5-25 b).
6-12
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