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ARMY TM 9-4120-381-14
NAVY EE-000- CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
4-47.
SUPPRESSION DIODES (CR2-CR11)
This task consists of:
Inspection
Testing
Removal
Installation
INITIAL SETUP:
Tools
Tool kit, service, refrigeration unit (Item 1, Appendix B)
Heat gun (Item 2, Appendix B)
Soldering iron (Item 16, Appendix B)
Goggles, industrial (Appendix C)
Personnel: 1
Materials:
Solder, lead-tin alloy (Item 18, Appendix E)
Flux, solder, liquid rosin base (Item 19, Appendix E)
Equipment Conditions:
WARNING
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.
2.
Open left electric plate (para 4-30):
3.
Open right electric plate (para 4-31).
INSPECTION
1.
Check diode for cracks, evidence of overheating, and other visible damage. Replace, if damaged (see Figure 4-
50).
2.
Check that diode is connected between terminals 3 and 10 for control relays K1- K5, and K20 (see Figure FO-3). 3.
Check that diode is connected between terminals 2 and 10 for control relays K6, K7, K18, and K19 (see Figure
FO-3).
TESTING
1.
Use multimeter to check forward-and-back resistance of diode.
··
Back resistance should be 900 to 1100 ohms.
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Forward resistance should be 0 to 5 ohms.
2. .
Replace diode, if defective.
REMOVAL
1.
Remove two screws (2) from relay.
2.
Remove diode (1).
INSTALLATION
1.
Assemble replacement diode with wire terminals and shrink tubing. Color band denotes cathode end.
2.
Place diode (1) in mounting position.
3.
Install two screws (2).
4-87
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