Troubleshooting & repair – Lincoln Electric VANTAGE 400 User Manual
Page 136
OUTPUT RECTIFIER BRIDGE AND CHOKE REMOVAL AND REPLACEMENT
(CONTINUED)
REMOVAL PROCEDURE
1. Turn the engine off.
2. Remove negative battery cable.
3. Perform the Case Cover Removal proce-
4. Perform the Chopper Module Capacitor
5. Remove the four screws holding the case
front to the base of the machine.
6. Remove all plugs and leads from the weld
control and pull coil PC boards. Be sure to
mark the leads and plugs so they can be
properly re-connected. See wiring dia-
gram.
7. Remove the screws holding the D4 diode
bridge and the CR1 engine protection relay
to the center baffle assembly, and allow
these components to remain attached to
the case front wiring.
8. Remove any additional wring and cable ties
as needed. Carefully mark leads for accu-
rate re-connection.
9. Swing the case front to the side to permit
access to the Output Rectifier and Choke.
Removing the Output Rectifier
10. Remove the heavy leads from the output
rectifier. Carefully mark the leads for
accurate re-connection, and also note the
order and position of multiple lead con-
nections.
11. Remove the nuts and lock washers hold-
ing the Output Rectifier to the mounting
bracket. You will need to reach through
the large access holes on either side of the
rectifier to reach these nuts.
12. Remove the Output Rectifier from the
machine.
Removing the Output Choke
1. Remove the heavy leads from the choke.
Carefully mark the leads for accurate re-
connection, and also note the order and
position of the leads in multiple lead con-
nections.
2. Remove the three long bolts, lock washers
and nuts holding the choke the mounting
bracket in the machine base. Note that
there is no bolt in the lower right corner of
the choke.
3. Carefully remove the choke.
REPLACEMENT PROCEDURE
Replacing the Output Choke
1. Place the choke into the machine so that
the three mounting holes in the choke line
up with the holes in the mounting bracket.
2. Insert the three long bolts through the
choke and the mounting bracket. Place a
lock washer and nut on the end of each bolt
and tighten.
3. Reconnect the choke leads. Position the
leads, bolts, washers, and nuts exactly as
they had been originally connected.
Tighten the connection securely.
TROUBLESHOOTING & REPAIR
F-88
F-88
VANTAGE® 400