TROUBLESHOOTING (Continued)

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 2-52