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 TM 5-1940-277-20
TM 1940-20/2
Look at meter and note reading.
5.
6.
Reverse the meter probes and note meter reading.
7.
Compare meter reading obtained in steps 5 and 6.
If one meter reading was approximately 20 OHMS and the other reading was infinity ( ) the zero diode is good.
Go to step 8.
If both meter readings were the same, the zener diode is bad. Replace control box (refer to paragraph 3-110).
The trouble is not in the surge protection unit. Fasten unit in place and go back to troubleshooting procedure for next
8.
instruction.
Replace voltage regulator cover with two screws (1) using flat tip screwdriver.
9.
3-244
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