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TROUBLESHOOTING & REPAIR | |||
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| OUTPUT RECTIFIER BRIDGE TEST (continued) |
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7.Check for grounds by placing one of the ohm meter probes on a clean, unpainted metal surface of the machine. Touch the other probe to each of the five rectifier terminals. The resistance to chassis ground from each terminal should be very high, 500,000 (500K) ohms minimum. If the resistance reading is less than specified, the rectifier is grounded and should be replaced.
8.If using diode checker or a multimeter with diode check functionality, read and under- stand the instructions that accompany your test equipment.
9.If using an analog ohmmeter, the forward bias test will indicate low resistance and the reverse bias test will indicate high resistance. Precise ohm values for this test will vary depending on a test equipment used.
NOTE: A digital Ohmmeter is not recommended for this test. A typical digital Ohmmeter does not provide enough voltage or cur- rent flow to reliably test the diodes used in this rectifier.
10. Test all of the diode groups per the Table F.1.
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FIGURE F.16 – SHUNT/RECTIFIER LEADS
| POS. | NEG. | W2 | TOP | BRIDGE |
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| OUTPUT | ||
W3 |
| W1 | CENTER | RECTIFIER | |
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| W3 | BOTTOM |
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W2 |
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| OR |
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W1W4,W5 | W6,W11 |
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W10 |
| FROM SHUNT |
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| CHOKE |
