TM 5-4520-241-14
b. Cleaning and Inspection.
WARNING
Clean parts in a well-ventilated area. Avoid inhalation of solvent fumes and
prolonged exposure of skin to cleaning solvent. Wash exposed skin thoroughly.
Dry cleaning solvent (fed. spec. P-D-680) used to clean parts is potentially
dangerous to personnel and property. Do not use near open flame or excessive
heat. Flash point of solvent is 100 F (38 C).
(1) Clean all electrical parts with a cloth dampened with dry 'leaning solvent (fed. spec. P-D-680).
(2) Inspect the harness for loose or broken terminals, frayed or damaged insulation, or burned wires. Replace
any defective parts or replace the complete harness of damage is evident in several components.
c. Reassembly.
Reassemble in reverse order of disassembly, using figures 6-1 and 6-2 as guides.
Note the
following:
(1) Solder all wires with rosin core electrical solder. When soldering wires to the male plug, hold the soldering
tool against the pin, insert the wire from the back, and apply solder to the center hole in the pin.
(2) Spray all soldered connections on the PC board with moisture repellant conforming to MIL-V-173 (Columbia
Technical Corporation Humi-Seal No. 1A27, Class A, or equivalent).
(3) Reconnect the power plug and test for normal operation.
6-3.
PC BOARD AND TIME DELAY ASSEMBLY.
The PC board and transistor assembly and the time delay assembly ate closely interconnected with soldered wires,
so that removal or disassembly of one may require removal and/or partial disassembly of the other.
WARNING
This space heater contains dangerous voltages which can cause severe electrical
shock. Be sure to disconnect the power plug before repairing the heater.
a. Testing. To facilitate testing, perform the following tests before removing the control box from the heater, or
otherwise disassembling the heater or case.
6-3
