Troubleshooting & repair – Lincoln Electric POWER-ARC 4000 SVM103-A User Manual
Page 68
POWER-ARC 4000
F-27
TROUBLESHOOTING & REPAIR
CAPACITOR AND/OR DIODE BRIDGE REMOVAL AND REPLACEMENT
(continued)
FIGURE F.8 - DIODE BRIDGE LOCATION AND DISCHARGING THE FIELD CAPACITOR
JUMPER
DIODE
BRIDGE
CAPACITOR
PROCEDURE - CAPACITOR
REMOVAL AND REPLACEMENT
1. Remove the engine spark plug wire.
2. With the 5/16” nut driver, remove the 4
sheet metal screws that hold the top cover
to the control box. Remove the top cover.
3. Discharge the field capacitor by connect-
ing the jumper wire clips on the black and
the red wire terminals on the top of the
capacitor. See Figure F.8 for location.
Leave the clips on for at least 5 seconds,
then remove.
4. Both the capacitor and the diode bridge
are mounted in a molded plastic holder.
To remove it, pull out on the top of the
holder, then slide it upward.
5. Snap the capacitor out of the assembly.
6. Loosen the two screws on the top of the
capacitor. Lead 202A (Red) attaches to
the positive (+) terminal. Leads 201 and
201A (both Black) attach to the negative (-
) terminal.
7. To replace the capacitor, reattach the
leads to their respective terminals (202A
Red to positive (+); 201 and 201A Black to
negative (-) and tighten the screws secure-
ly. Snap the capacitor back into the mold-
ed plastic holder and slide the holder back
into position in the panel. Replace the top
cover of the control box and tighten down
the 4 sheet metal screws with the 5/16” nut
driver.