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ARMY TM 9-4120-381-14
NAVY EE-000- CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
4-46.
RECTIFIER ( CR1 ).
This task consists of: Inspection / Testing
Removal
Installation
INITIAL SETUP:
Tools
Tool kit, service, refrigeration unit (Item 1, Appendix B)
Personnel: 1
Materials:
Varnish, moisture and fungus resistant (Item 16, 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 / TESTING
1.
Check that wire leads are properly connected to rectifier and are not damaged (see Figure 4-49 and Figure FO-3).
2.
If rectifier is suspected bad, tag and remove rectifier leads.
NOTE
A diode bridge will sometimes act differently under a power test than resistance test.
3.
Apply 28 volts ac across terminals 1 and 4 and use a dc voltmeter with negative probe on terminal 2 and positive
probe on terminal 3 to test output voltage. The meter should read 24 ± 5 V dc. If output voltage is not within
limits, replace rectifier.
4.
Use multimeter to test for continuity between each of four rectifier terminals and mounting plate. If continuity is
found between any rectifier terminal and mounting plate, replace rectifier.
5.
Use multimeter to test forward and reverse resistance across rectifier bridge terminals 1 and 4, and 2 and 3. If
resistance is less than 1000 ohms, replace rectifier.
REMOVAL
1.
Tag and disconnect leads.
2.
Remove screw (1), two flat washers (3), and nut (4).
3.
Remove rectifier (2).
INSTALLATION
1.
Fungus proof replacement rectifier per MIL-V-173.
2.
Place rectifier (2) in mounting position.
3.
Reconnect leads and remove tags.
4.
Install screw (1), two flat washers (3), and nut (4).
4-85
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