TROUBLESHOOTING (Continued)

TM- 9-4910-663-34 Table 2-5. TROUBLESHOOTING (Continued) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION through CR4. Connect positive lead of ohmmeter to + terminal of rectifier assembly CR1 through CR4, and connect negative ohmmeter lead to each AC input terminal in turn. Check for very high resistance in each case. If resistance of approximately 0 to 1000 ohms is measured, replaced rectifier assembly CR1 through CR4. Step 7. Repeat measurements of step 6, except with ohmmeter leads reversed. Check for very low resistance indication. If open circuit indication is obtained, replace rectifier assembly CR1 through CR4. Step 8. Disconnect lead from - terminal of rectifier assembly CR1 through CR4. Connect negative lead of ohmmeter to - terminal of rectifier assembly CR1 through CR4, and connect positive ohmmeter lead to each AC input terminal in turn. Check for very high resistance indication in each case. If resistance indication of 0 to 1000 ohms is obtained, replace rectifier assembly CR1 through CR4. Step 9. Repeat measurements of step 8, except with ohmmeter leads reversed. Check for very low resistance indication. If open circuit indication is obtained, replace rectifier assembly CR1 through CR4. Step 10. Reconnect leads disconnected in steps 6 and 8. Set circuit breaker switch CB1 to ON position. Using AC voltmeter, check for 30 volts ±10% between terminals X1 and X4 of transformer T2, and for 115 volts ±10% between terminals H1 and H4 of transformer T2. If voltage between terminals H1 and H4 is normal; but no voltage indication is obtained between terminals Xl and X4, replace transformer T2. 2-24