TM 5-4520-241-14
(12) If stud turnlock fastener (41) is worn, loose, or damaged, pry off lock washer (42) and remove the stud
turnlock fastener.
(13) If hinge (44) is damaged, drill out rivets (43) to remove hinge from cover (45).
c. 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 cleaning solvent (fed. spec. P-D-680), and dry
thoroughly.
(2) Clean all other parts with cleaning solvent and dry thoroughly.
(3) Tests for functioning parts of the time delay were described in paragraph a. No functional tests of the PC
board are available for bench testing.
(4) Inspect all wires for cracked, burned, or abraded insulation. Replace defective wires.
(5) Inspect all hardware parts for stripped or damaged threads or other damage. Replace defective parts.
(6) The operating instructions embossed on the cover cannot be repaired. Replace the cover if the markings on
it are illegible. Be sure to transfer the heater serial number to the new cover.
d. Reassembly. Reassembly of the control box is essentially the reverse of disassembly. Note the following:
NOTE
Items 7 through 15 are also available as a complete assembly. It is recommended
that these parts be replaced as an assembly, rather than replacing the transistor
separately. If this is done, skip steps (1) and (2).
(1) If only the transistor has been replaced, connect the transistor to the PC board as follows. New transistors
are supplied with attaching hardware (7 through 11, and 13, fig. 6-3), plus insulator (13). Apply heat sink compound (Dow
6-8
