TM 9-4120-402-14
4-42. RECTIFIER (CR4). - continued
b. Test.
(1) Remove nut (2) and lock washer (3). Pull rectifier (1) out of unit as far as wire leads will allow.
(2) Tag and disconnect wire leads from rectifier (1) terminals.
(3) Using a multimeter on high ohms setting connect negative (-) lead to terminal 2 and positive (+) lead to terminal
1 or 3. A low resistance reading should be indicated.
(4) Connect positive lead to terminal 2 and negative lead to terminal 1 or 3. An open circuit should be indicated.
(5) Connect positive lead to terminal 4 and negative lead to terminal 1 or 3. A short circuit should be indicated.
(6) Connect negative lead to terminal 4 and positive lead to terminal 1 or 3. An open circuit should be indicated.
(7) Replace defective rectifier.
(8) Connect wire leads to rectifier (1) using tags and wiring diagram figure 4-10. Remove tags.
(9) Install rectifier (1) to unit using lock washer (3) and nut (2).
c. Replace.
(1) Remove nut (2) and lock washer (3). Pull rectifier (1) out of unit as far as wire leads will allow.
(2) Tag and disconnect wire leads from rectifier (1) terminals.
(3) Connect wire leads to new rectifier (1) using tags and wiring diagram figure 4-10. Remove tags.
(4) Install new rectifier (1) to unit using lock washer (3) and nut (2).
NOTE
FOLLOW-ON MAINTENANCE:
Install control assembly (para 4-34).
Connect power at power source.
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