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TROUBLESHOOTING & REPAIR
F-28 F-28
POWER MIG 350MP
WIRE DRIVE MOTOR AND TACHOMETER FEEDBACK TEST (continued)
FIGURE F. 8 – PLUG J83 AND J84 LOCATIONS ON FEEDER BOARD
TEST PROCEDURE
NOTE: POLARITY MUST BE OBSERVED FOR
THESE TESTS.
TEST FOR CORRECT WIRE DRIVE MOTOR ARMA-
TURE VOLTAGE
1. Disconnect main input power to the machine.
2. Open the side panels and remove the tool tray
using a 5/16” nut Driver.
3. Locate the following leads on plug J83:
4. Locate leads 831(black) and 832(white) on plug
J83.
5. Connect the main power to the machine.
7. Make the following voltage tests. From the table
below.
8. Carefully insert the meter probes into the back of
each Molex plug pin cavity to perform the test.
9. Turn the machine ON and pull the gun trigger to
conduct this voltage test.
FROM LEAD TO LEAD EXPECTED VOLTAGE
831 + 832 - 2.5-27 VDC
(1J83) (2J83) (varies depending
on wire feed speed)
