TM 9-4910-663-34
Table 2-5. TROUBLESHOOTING (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
If resistance indication at any terminal is not as specified, replace load bank element.
Step 32. Using ohmmeter, check for continuity across each set of contacts of LOAD SELECTION 100
AMPS/50 AMPS switch S18 with switch S18 set to ON position.
If open indication is obtained for any set of switch contacts, replace switch S18.
Step 33. Set LOAD SELECTION 100 AMPS/50 AMPS switch S18 to OFF position. Set LOAD SELECTION
100 AMP/50 AMPS switch S17 to ON position. With circuit breaker switch CB1 set to ON position,
check for 0.285 ohm ±5% resistance indication between REGULATOR B+ and REGULATOR B-
binding posts, using ohmmeter.
If resistance indication is not as specified, proceed to step 34.
Step 34. Set LOAD SELECTION 100 AMPS/50 AMPS switch S17 to OFF position. Using ohmmeter, check
for 1.14 ohm ±5% resistance indication between REGULATOR B- binding post and each of load
bank terminals 1, 2, 3, and 4.
If resistance indication at any terminal is not as specified, replace load bank element.
Step 35. Using ohmmeter, check for continuity across each set of terminals of LOAD SELECTION 100
AMPS/50 AMPS switch S17 with switch S17 set to ON position.
If open indication is obtained for any set of switch contacts, replace switch S17.
7.
BATTERY VOLTAGE SELECTOR CIRCUIT
a.
BATTERY VOLTAGE SELECTOR INOPERATIVE OR OPERATES ERRATICALLY WHEN TESTING EXTERNAL
COMPONENTS.
Step 1.
Disconnect all batteries from battery compartment battery terminals. Check to see that circuit
breaker switch CB1, CIRCUIT BREAKERS CB2 DRIVE CONTROL circuit breaker, and CIRCUIT
2-32
