TROUBLESHOOTING (Continued)

TM 9-4910-663-34 Table 2-5. TROUBLESHOOTING (Continued) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Replace timer TD1 if open indication is obtained. Step 7. Reconnect lead disconnected in step 6. Disconnect lead from + terminal of rectifier assembly CR5 through CR8. Using high range of ohmmeter, check for very high resistance with ohmmeter positive lead connected to + terminal of rectifier assembly CR5 through CR8, and negative lead of ohmmeter connected to each AC input terminal of rectifier assembly in turn. If resistance of 0 to 1000 ohms is indicated, replace rectifier assembly CR5 through CR8. Step 8. Repeat procedure of step 7, except reverse ohmmeter leads and check for very low resistance. If open circuit is indicated, replace rectifier assembly CR5 through CR8. Step 9. Reconnect lead disconnected in step 7. Disconnect lead from negative terminal of rectifier assembly CR5 through CR8. Using high range of ohmmeter, check for very high resistance with ohmmeter negative lead connected to negative terminal of rectifier assembly CR5 through CR8 and positive lead of ohmmeter connected to each AC input terminal of rectifier assembly in turn. If resistance of 0 to 1000 ohms is indicated, replace rectifier assembly CR5 through CR8. Step 10. Repeat procedure of step 9, except reverse ohmmeter leads and check for very low resistance. If open circuit is indicated for either check, replace rectifier assembly CR5 through CR8. Step 11. Reconnect lead disconnected in step 9. Set circuit breaker switch CB1 to ON position, and adjust CHARGE TIMER (MINUTES) control to 10 minute setting. Using AC voltmeter, check that AC voltage between terminals H1 and H4 of transformer T4 is adjustable over range of 0 to 130 volts using BATTERY CHARGE CIRCUIT control T3, and AC voltage between terminals X1 and X4 of transformer T4 is adjustable over range of 0 to 32 volts using BATTERY CHARGE CIRCUIT control T3. 2-41