ARMY TM 9-4120-380-14
NAVY EE-000-BA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-21
4.31 RESISTOR BOARD This task covers inspection, repair/replace, removal and installation
INITIAL SETUP
Tools
Tool kit, service, refrigeration unit (Item 1, Appendix B)
Solder gun (Item 7, Appendix B)
Goggles, industrial (Appendix C)
Personnel. 1
Materials
Solder, lead-tin alloy (Item 16, Appendix E)
Flux, solder, liquid rosin base (Item 17, Appendix E)
Equipment Conditions.
Disconnect input power to the air conditioner before performing any internal
maintenance. Voltages used can KILL. Shutting the unit off at the control panel does not
disconnect unit power.
(1) Disconnect air conditioner input power at source; and
(2) Remove control box assembly (paragraph 4.27).
INSPECTION
a
Check board for signs of overheating or other visible damage. Replace if damaged (see fig. 4-22)
b. Check resistors for signs of overheating and other visible damage. (Refer to paragraph 4 32 If resistor is defective.)
REPAIR/REPLACE
NOTE
Repair consists of replacing resistor board.
If resistor R1-R7 is damaged refer to paragraph 4.32 for replacement.
REMOVAL
a. Tag and unsolder wrong harness leads from resistor board (3).
b. Remove four screws (5), four flat washers (2), and four locknuts (1)
c.
Remove resistor board (3) and standoff spacers or fiber board (4)
4-63
