Troubleshooting and repair – Lincoln Electric POWER MIG SVM170-A User Manual
Page 60
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F-20
TROUBLESHOOTING AND REPAIR
F-20
POWER MIG 255C
4. Verify that the capacitors have
completely discharged with a volt-
ohmmeter.
5. Disconnect plugs J6 and J5 from the
control board . This electrically isolates
the SCR bridge assembly. See Figure
F.3.
TEST PROCEDURE
1. Disconnect main AC input power to the
machine.
2. Remove the case top and side panels
with a 3/8 in. nutdriver.
3. Remove the tool tray with a 5/16 in. nut-
driver.
STATIC SCR RECTIFIER ASSEMBLY TEST (continued)
FIGURE F.3 — REMOVE PLUGS J6 AND J5 TO PERFORM STATIC RECTIFIER ASSEMBLY TEST.
J6
J5
J3
J8
J1
J4
J2
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