Lincoln Electric Ranger 305D Service Manual page 121

F-67
CHOPPER MODULE RESISTANCE TEST ( ontinued)
5. Reconnect all leads.
6. The chopper module screw connection should be lightened to 50-60 inch-pounds.
7. Perform the Case Cover Replacement procedure.
TROUBLESHOOTING & REPAIR
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TABLE F.2 – DIODE TEST TABLE
OHMMETER
(+) Lead
B5
B6
B4
B5
B4
B6
B2
B3
B4
B2
B4
B3
RANGER 305D
OHMMETER
(-) Lead
and Expected
B6
B5
B5 200k or higher
B4 400k or higher
B6 200k or higher
B4 400k or higher
B3
B2
B2 200k or higher
B4 400k or higher
B3 200k or higher
B4 400k or higher
READING
Diode Bias
Test Result
6K to 9K
6K to 9K
6K to 9K
6K to 9K
F-67