Lincoln Electric POWER WAVE C300 Service Manual page 35

F-16
CASE COVER REMOVAL AND DC LINK CAPACITOR
PROCEDURE
1. Disconnect the input power to the POWER
WAVE® C300 machine.
2. Using the 5/16 inch nut driver remove six of the
eight corner end caps as shown in Figure F.1.
Keep the screws and flat washers for reassem-
bly.
3. To gain access to the left side internal compo-
nents use the 5/16 inch nut driver to remove
the four remaining screws from the left side.
See Figure F.1.
4. Locate the DC Link Capacitor and carefully
check the voltage across it. See Figure F.2. If
any voltage is present discharge the capacitor
using the high wattage resistor (25-1000 ohms
@ 25 watts minimum), electrically insulated
gloves and pliers. Hold on the resistor termi-
nals on the capacitor terminals for 10 seconds.
TROUBLESHOOTING AND REPAIR
DISCHARGE PROCEDURE (continued)
FIGURE F.1 – CASE COVER SCREW LOCATION
POWER WAVE® C300
5. Recheck the voltage across the capacitor ter-
minals. The voltage should be zero. If any volt-
age remains repeat the procedure. Note. Any
voltage present after discharge has been per-
formed is an abnormal condition.
6. To gain access to the top portion of the unit
remove the ten remaining screws from the top
cover.
7. When replacing the case side and/or top be
sure to secure all screws.
8. When replacing the corner end caps be certain
to replace the flat washers previously
removed.
F-16