Troubleshooting & repair – Lincoln Electric POWER-ARC 4000 SVM103-A User Manual
Page 69
POWER-ARC 4000
F-28
PROCEDURE - DIODE BRIDGE
REMOVAL AND REPLACEMENT
1. To remove the diode bridge, first you will
have to remove the field capacitor. Follow
Steps 1 - 5 on capacitor removal and
replacement procedure.
2. Depress the retainer clip on the molded
plastic holder and slide the diode bridge
out.
3. With the needle nose pliers, gently remove
the 4 wires from the diode bridge.
4. Replace the wires to their appropriate loca-
tions on the new diode bridge:
Lead 200 (Red) attaches to the positive (+)
terminal. Depending on the bridge used, this
corner may be beveled and/or marked with a +
sign.
Lead 201 (Black) and 201B (Green) are pig-
gybacked on the negative (-) terminal, which will
always be located diagonally across from the
positive (+) terminal.
The 2 Blue leads are the AC side of the
bridge and attach to the other two corners.
Either lead can go on either terminal.
5. Slide the bridge back into the molded plas-
tic holder until the retainer clip snaps it
securely in place. Snap the capacitor back
into the holder and then slide the unit back
into position in the panel.
6. Check that the leads are not grounded and
for clearance and tightness.
7. Replace the top cover of the control box
and tighten the 4 sheet metal screws with
the 5/16” nut driver.
TROUBLESHOOTING & REPAIR
CAPACITOR AND/OR DIODE BRIDGE REMOVAL AND REPLACEMENT
(continued)