TM- 9-4910-663-34
Table 2-5. TROUBLESHOOTING (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Replace circuit breaker CB3 or CB4 if open indication is obtained.
Step 5. Reconnect leads disconnected in step 4. Set circuit breaker switch CB1 to ON position. Open
rectifier chamber door and visually examine wheel of blower B2 while pressing START switch S3.
Replace blower motor B2 if wheel fails to rotate.
2. REGULATOR FIXED RESISTANCE CIRCUIT a. REGULATOR TESTS INVOLVING USE OF FIXED RESISTANCES
PRODUCE ABNORMAL RESULTS, EVEN WITH REGULATOR KNOWN TO BE GOOD.
Step 1. Check to see that REGULATOR CHECK FIXED RESISTANCE METHOD switch S13 is set to ON
position.
Set switch S13 to ON position.
Step 2. Using ohmmeter, check for continuity across terminals of REGULATOR CHECK FIXED
RESISTANCE METHOD switch S13 with switch S13 set to ON position.
Replace switch S13 if open indication is obtained.
Step 3. Using ohmmeter, check for 7 ohm ±10% indication between REGULATOR B-binding post and
REGULATOR CHECK FIXED RESISTANCE METHOD 7 OHM binding post.
Replace resistor R13 if resistance indication is not as specified.
Step 4. Using ohmmeter, check for 2-1/4 ohm ±10% indication between REGULATOR B-binding post and
REGULATOR CHECK RIXED RESISTANCE METHOD 2 1/4 OHM binding post.
Replace resistor R12 if resistance indication is not as specified.
Step 5. Using ohmmeter, check for 1-1/2 ohm ±10% indication between REGULATOR B-binding post and
REGULATOR CHECK FIXED RESISTANCE METHOD 1 1/2 OHM binding post.
Replace resistor R11 if resistance is not as specified.
2-20
