Troubleshooting & repair, Static scr/diode rectifier bridge test (continued) – Lincoln Electric IDEALARC SVM136-A User Manual
Page 62
TROUBLESHOOTING & REPAIR
F-22
F-22
IDEALARC CV-400
STATIC SCR/DIODE RECTIFIER BRIDGE TEST (continued)
FIGURE F.9 – CONTROL BOARD AND SNUBBER BOARD PLUG LOCATIONS
FIGURE F.10 – CAPACITOR STRAP LEAD CONNECTIONS
SMALL LEAD
TERMINAL
POSITIVE
CAPACITOR
STRAP LEAD
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 plug 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. Locate and remove lead #204 from resistor
R2 (7.5 ohms, 100 watts). See Figure F.14.
7. Using the 9/16” wrench, remove the positive
capacitor strap lead and small lead terminal
from the rectifier plate and output shunt junc-
tion. See Figure F.10.
M15370-[
] SNUBBER
Plug P5
G2629-[
]
CV-400/CV-500-I CONTROL
Plug P1
#201
#202
#203
#204
Plug P3