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F-27 F-27
POWER MIG 300
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TROUBLESHOOTING & REPAIR
ENCODER PC BOARD TEST (continued)
G3884
J82
3243
J85
858
857
855
8511
8510
859
FIGURE F. 9 - FEEDHEAD P.C. BOARD
TEST PROCEDURE
1. Disconnect the main AC input power to the
machine.
2. Locate the following leads on Plug J85 and J86
located on the feedhead P.C. Board. See Figure
F.9.
3. Connect main input power to the machine.
4. Make the following voltage tests. From the tables
on following page.
5. Turn the machine OFF between each test.
6. Carefully insert the meter probes into the back of
each Molex plug pin cavity.
7. As you turn the encoder slowly
the voltage will
change from zero to15 volts to zero, to 15 volts etc.
as you continue to turn the encoder.