TROUBLESHOOTING (Continued)

TM 9-4910-663-34 Table 2-5. TROUBLESHOOTING (Continued) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Step 1. Set all controls to initial positions listed in table 2-2. Set FIELD CIRCUIT switch S32 to MANUAL position. Set EXTERNAL FIELD EXCITER AC SYSTEM switch S31 to ON position. Set DC AMMETER FIELD CURRENT RANGE switch S30 to X6 position. Set FINE CONTROL 0-5 AMPS (MAX) switch S29 to OFF position. Set FIELD CURRENT 0-30 AMPS (MAX) control R26 fully clockwise. Set DC VOLTMETER OUTPUT VOLTAGE SELECT switch S11 to VAR position, and DC VOLTMETER OUTPUT VOLTAGE RANGE switch S12 to X2 position. Set DC AMMETER LOAD & STARTER OUTPUT CURRENT BATTERY CHARGE CURRENT RANGE switch S14 to X1 position. Connect jumper lead between GENERATOR F and REGULATOR B+ binding posts. Connect 0-50 DC millivolt meter to calibration jacks below DC AMMETER LOAD & STARTER OUTPUT CURRENT BATTERY CHARGE CURRENT meter M3, observing polarity. Set circuit breaker switch CB1 to ON position. Check to see that DC VARIABLE POWER SUPPLY 0-32 VDC control T5 and VARIABLE LOAD control R32 are set fully counterclockwise. Set DC VARIABLE VOLTS switch S10 to ON position. Set MASTER LOAD DISCONNECT switch S8 and LOAD SELECTION 0-25 AMPS/0-12.5 AMPS switch S24 to ON position. Adjust DC VARIABLE POWER SUPPLY 0-32 VDC control to provide 10 volt indication on DC VOLTMETER OUTPUT VOLTAGE meter M2. Adjust VARIABLE LOAD control R32 clockwise to obtain 6 to 8 ampere indication on DC AMMETER FIELD CURRENT meter M7. Check to see that DC AMMETER LOAD & STARTER OUTPUT CURRENT BATTERY CHARGE CURRENT meter M3 indicates 6 to 8 amperes, and external DC millivolt meter indicates 10 to 13 millivolts. If external DC millivolt meter indication is normal but DC AMMETER LOAD & STARTER CURRENT BATTERY CHIARGE CURRENT meter M3 fails to indicate, replace meter M3. If both meters indicate zero, proceed to step 2. If both meter indications are normal, proceed to step 3. Step 2. Set circuit breaker switch CB1 to OFF position. Using ohmmeter, perform continuity check of circuits associated with DC AMMETER LOAD & STARTER OUTPUT CURRENT BATTERY CHARGE CURRENT RANGE switch S14 and DC AMMETER LOAD & STARTER OUTPUT CURRENT BATTERY CHARGE CURRENT PRESS FOR BATTERY CHARGE RATE switch S15. (See FO-1.) 2-49