Lincoln Electric VANTAGE 400 Service Manual page 106

F-58
OUTPUT RECTIFIER BRIDGE TEST (CONTINUED)
AC1
AC2
AC3
TEST PROCEDURE
1. Turn the engine off.
2. Perform the Case Cover Removal procedure.
3. Perform the Chopper Module Capacitor
Discharge procedure.
Electrically isolate the three-phase input
terminals of the output bridge rectifier as
follows:
4. Mark leads W1, W2, and W3 so they can be
properly reconnected after the test is complete.
Remove these leads and position them so they
do not come in contact with any part of the rec-
tifier. See Figure F.15. See wiring diagram.
Electrically isolate the DC output terminals
of the rectifier:
5. Mark the leads connected to the positive and
negative terminals of the output bridge rectifier
to assure that they can be reconnected prop-
erly. See Figure F.15.
TROUBLESHOOTING & REPAIR
FIGURE F.14
D1
D2
VANTAGE® 400
D3 D5
D4 D6
6. Remove leads W4, W5, and W10 from the
positive terminal of the Rectifier, and remove
leads W6 and W11 from the negative terminal.
Position these leads so they do not come to
contact with any part of the rectifier.
Figure F.15. See the wiring diagram..
F-58
DC+
X1
DC-
See