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TROUBLESHOOTING & REPAIR
F-25 F-25
IDEALARC CV-400
ACTIVE SCR TEST (continued)
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. 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 plug 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. Locate and remove lead #204 from resistor
R2 (7.5 ohms, 100 Watts). See Figure F.14.
7. Using 9/16” wrench, remove the positive
capacitor strap lead and small lead terminal
from the positive rectifier plate and output
shunt junction. See Figure F.10.
FIGURE F.12 – CONTROL BOARD PLUG
P1 AND P3 LOCATIONS
FIGURE F.13 – SNUBBER BOARD
PLUG P5 LOCATION
FIGURE F.14 – RESISTOR R2 LOCATION
M15370-[ ] SNUBBER
Plug P5
G2629-[ ] CV-400/CV-500-I CONTROL
Plug P1
#201
#202
#203
#204
Plug P3