Lincoln Electric VANTAGE SVM178-B Service Manual page 204

F-16
CHOPPER MODULE CAPACITOR DISCHARGE PROCEDURE (CONTINUED)
FIGURE F.2 – CHOPPER MODULE CAPACITOR TERMINAL DISCHARGE
INSULATED
GLOVE
RESISTOR
PROCEDURE
1. Turn engine off.
2. Perform the Case Cover Removal Procedure.
Note: It is necessary to remove the fuel cap in order to
take the case cover off the machine. Be sure
the fuel cap is ON when discharging the chop-
per module capacitors.
3. Locate the chopper module on the inner machine
baffle. See Figure F.2 and the Wiring Diagram.
TROUBLESHOOTING AND REPAIR
POWER
VANTAGE® 500
B8
B1
B2
B3
4. Discharge Capacitors.
If the Lincoln recommended resistor, or an equivalent
resistor is used, the capacitors can be discharged by
holding the resistor with insulated pliers and using the
resistor terminals to bridge chopper module terminals
B1 to B2, and B4 to B5. DO NOT TOUCH THE TER-
MINALS OR METAL PARTS OF THE PLIERS WITH
YOUR BARE HANDS. Hold the resistor in place for
about 10 seconds.
If another type of resistor is used, jumper leads may
need to be attached to the resistor. The leads can then
be used to connect terminals B1 to B2, and B4 to B5.
5. Using the volt/ohmmeter, check the voltage across
B1 and B2 then B4 and B5. It should be zero volts
in both cases. See Figure F.2.
F-16
B7
B4
B5
B6