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TROUBLESHOOTING & REPAIR
DC BUS BOARD REMOVAL AND REPLACEMENT (Continued)
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PROCEDURE
1.Remove input power to the POWER WAVE 355/405.
2.Using a 5/16” nut driver remove the case wrap- around cover.
3.Perform the Input Filter Capacitor Discharge Procedure detailed earlier in this section.
4.Locate the DC Bus Board. See Figure F.27.
5.Using a 5/16” nut driver remove the two screws from the bottom of the front of the machine. See
Figure F.28.
6.Using a phillips head screwdriver remove the two screws and their washers from above and below the input power switch. See Figure F.28.
7.Using a phillips head screwdriver remove the four screws mounting the two welder output terminals on the front of the machine. See Figure F.28.
8.The front of the machine may now gently be pulled forward to gain access to the DC Bus Board. Note: The front of the machine cannot be removed completely, only pulled forward a few inches.
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FIGURE F.27 DC BUS BOARD LOCATION
DC BUS BOARD
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STATUS
THERMAL
LINCOLN IC
ELECTR
WARNING
REMOTE
POWER
ON
OFF
