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TROUBLESHOOTING & REPAIR
ACTIVE SCR TEST (continued)
FIGURE F.12 – CONTROL BOARD PLUG | FIGURE F.13 – SNUBBER BOARD |
P1 AND P3 LOCATIONS | PLUG P5 LOCATION |
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Plug P1
Plug P5
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Plug P3
FIGURE F.14 – RESISTOR R2 LOCATION
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. Remove the screws holding the front panel and lower the panel.
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.12.
5.Locate and remove molex plug P5 from the snubber board. See Figure F.13.
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.14.
IDEALARC
LINCOLN ®
ELECTRIC
