TROUBLESHOOTING (Continued)

TM- 9-4910-663-34 Table 2-5. TROUBLESHOOTING (Continued) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Step 6. Using ohmmeter, check for 1/4 ohm ±10% indication between REGULATOR B± binding post anU REGULATOR CHECK FIXED RESISTANCE METHOD 1/4 OHM binding post. Replace resistor R10 if resistance is not as specified. 3. DC VARIABLE POWER SUPPLY CIRCUITS a. DC VOLTAGE AT DC VARIABLE VOLTS OUTPUT BINDING POSTS CANNOT BE ADJUSTED OVER 0 TO 32 VOLT RANGE. Step 1. If DC voltage at DC VARIABLE VOLTS OUTPUT binding posts is zero, check to make sure that circuit breaker switch CB1, CIRCUIT BREAKERS CB2 DRIVE CONTROL circuit breaker, CIRCUIT BREAKERS CB7 DC VAR. VOLTS circuit breaker, CIRCUIT BREAKERS CB9 DC VAR. VOLTS circuit breaker, and DC VARIABLE VOLTS switch S10 are all set to ON position. Set switches and circuit breakers to ON position. Step 2. Set circuit breaker switch CB1 to OFF position. Using ohmmeter, check for continuity across terminals of DC VARIABLE VOLTS switch S10 with switch set to ON position. Replace switch S10 if open indication is obtained. Step 3. Using ohmmeter, check for continuity across terminals of CIRCUIT BREAKERS CB9 DC VAR. VOLTS circuit breaker with circuit breaker set to ON position. Replace CIRCUIT BREAKER CB9 if open indication is obtained. Step 4. Disconnect lead from one terminal of CIRCUIT BREAKERS CB7 DC VAR. VOLTS circuit breaker. Using ohmmeter, check for continuity across terminals of CIRCUIT BREAKER CB7 with circuit breaker set to ON position. Replace CIRCUIT BREAKER CB7 if open indication is obtained. Step 5. Replace lead disconnected in step 4. Disconnect lead from ± terminal of rectifier assembly CR9 through 2-21