TM 9-4910-663-34
Table 2-5. TROUBLESHOOTING (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
0-32 VDC control T5 is set fully counterclockwise. Set circuit breaker switch CB1 and DC VARIABLE
VOLTS switch S10 to ON position. Adjust DC VARIABLE POWER SUPPLY 0-32 VDC control T5 to
provide 5 volt indication on DC VOLTMETER OUTPUT VOLTAGE meter M2. Check to see that
external DC voltmeter and AC VOLTMETER OUTPUT VOLTAGE meter M6 both indicate
approximately 5 volts.
If meter indications are zero, replace AC VOLTMETER OUTPUT VOLTAGE SELECT switch
S28.
Step 6. Set all controls to preliminary positions listed in table 2-2. Set AC VOLTMETER OUTPUT
VOLTAGE RANGE switch S27 to X1 position. Set DC VOLTMETER OUTPUT VOLTAGE SELECT
switch to VAR position, and DC VOLTMETER OUTPUT VOLTAGE RANGE switch to X1 position.
Leave external DC voltmeter connected as in step 1. Set AC VOLTMETER OUTPUT VOLTAGE
SELECT switch S28 to CIRCUIT T2-T3 position. Connect test lead from positive DC VARIABLE
VOLTS OUTPUT binding post to ALTERNATOR T2 binding post, and connect another test lead from
negative DC VARIABLE VOLTS OUTPUT binding posts to ALTERNATOR T3 binding post. Make
certain that DC VARIABLE POWER SUPPLY 0-32 VDC control T5 is set fully counterclockwise. Set
circuit breaker switch CB1 and D.C. VARIABLE VOLTS switch-S10 to ON position. Adjust DC
VARIABLE POWER SUPPLY 0-32 VDC control T5 to provide 5 volt indication on DC VOLTMETER
OUTPUT VOLTAGE meter M2. Check to see that external DC voltmeter and AC VOLTMETER
OUTPUT VOLTAGE meter M6 both indicate approximately 5 volts.
If meter indications are zero, replace AC VOLTMETER OUTPUT VOLTAGE SELECT switch
S28.
15.
AC AMMETER OUTPUT CURRENT METER CIRCUIT
a.
AC AMMETER OUTPUT CURRENT METER INOPERATIVE OR OPERATES INCORRECTLY DURING TEST OF
EXTERNAL COMPONENTS.
Step 1. Set all controls to preliminary settings listed in table 2-2. Set DC VOLTMETER OUTPUT VOLTAGE
SELECT switch S11 to VAR position, and DC VOLTMETER OUTPUT VOLTAGE RANGE switch
S12 to X5 position. Set DC AMMETER LOAD & STARTER OUTPUT CURRENT BATTERY
CHARGE
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