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TROUBLESHOOTING & REPAIR
F-27 F-27
LINCOLN
®
ELECTRIC
IDEALARC DC-400
STATIC SCR/DIODE RECTIFIER BRIDGE TEST (continued)
FIGURE F.9 – CONTROL BOARD AND SNUBBER BOARD PLUG LOCATIONS
FIGURE F.10 – RESISTOR R2 LOCATION
TEST PROCEDURE
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.
DC-400 CONTROL
G2588-X
Plug P1
Plug P3
M15370-X SNUBBER
Plug P5