Lincoln Electric Cross Country 300 Service Manual page 78

LINCOLN ELECTRIC
10. Using a volt/ohmmeter, check for grounds by placing one of the ohmmeter probes on a clean,
unpainted metal surface of the machine. Place the probe on each of the five terminals of the
rectifier bridge. See Figure F.35. See Wiring Diagram. The resistance should be very high, 500,00
(500K) ohms minimum. If the resistance reading is less than specified, the rectifier is grounded and
should be replaced.
11. If using a diode checker or a multi-meter with diode check functionality, read and understand the
instructions that accompany your test equipment.
12. 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 the test
equipment used.
13. Using a volt/ohmmeter, perform the diode tests outlined in Table F.9. See Figure F.35. See Wiring
Diagram.
14. If any of the tests fail, the rectifier bridge may be faulty.
15. If faulty, perform the Output Rectifier Bridge Removal And Replacement Procedure.
16. Using two 1/2" open-end wrenches, attach the bolt, nut, lock washer and two flat washers securing
the two heavy leads to the negative terminal of the rectifier bridge. See Wiring Diagram.
17. Using a 1/2" nutdriver and 1/2" open-end wrench, attach the bolt, nut, lock washer and two flat
washers securing the two heavy leads to the positive terminal of the rectifier bridge. See Wiring
Diagram.
18. Using a 7/16" nutdriver and 7/16" open-end wrench, attach the bolt, nut, lock washer and two flat
washers securing leads W4 and W5 to the bottom terminal of the rectifier bridge. See Wiring
Diagram.
19. Using a 7/16" nutdriver and 7/16" open-end wrench, attach the bolt, nut, lock washer and two flat
washers securing leads W2 and W3 to the middle terminal of the rectifier bridge. See Wiring
Diagram.
20. Using a 7/16" nutdriver and 7/16" open-end wrench, attach the bolt, nut, lock washer and two flat
washers securing leads W1 and W6 to the top terminal of the rectifier bridge. See Wiring Diagram.
21. Perform the Case Cover Replacement Procedure.
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