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TROUBLESHOOTING & REPAIR
STATIC SCR/DIODE RECTIFIER BRIDGE TEST (continued)
FIGURE F.9 – CONTROL BOARD AND SNUBBER BOARD PLUG LOCATIONS
Plug P5
Plug P1
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Plug P3
TEST PROCEDURE
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1.Disconnect the main input supply power to the machine.
2.With the 5/16” nut driver, remove the case top and sides.
3.Disconnect the welding cables from the welding output terminals.
4.Locate and remove molex plugs P1 and P3 from the control board. See Figure F.9.
5.Locate and remove molex plug P5 from the snubber board. See Figure F.9.
6.Rotate the mode switch (S4) to the constant current (CC) position.
7.Locate and remove lead #204 from resistor R2 (40 ohms, 50 Watts). See Figure F.10.
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FIGURE F.10 – RESISTOR R2 LOCATION
IDEALARC DC-400
LINCOLN ®
ELECTRIC
