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F-64
DC BUS BOARD REMOVAL AND REPLACEMENT (continued)
PROCEDURE
1. Remove input power to the POWER WAVE
355M/405M.
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.28.
5. Using a 5/16" nut driver remove the two screws
from the bottom of the front of the machine. See
Figure F.29.
S T
W A
R N
IN
G
R E
M O
T E
TROUBLESHOOTING AND REPAIR
FIGURE F.28 – DC BUS BOARD LOCATION
DC BUS BOARD
A T
U S
T H
E R
M A
L
P O
W
E R
O N
O F
F
POWER WAVE
6. Using a phillips head screwdriver remove the two
®
screws and their washers from above and below
the input power switch. See Figure F.29.
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.29.
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 com-
pletely, only pulled forward a few inches.
®
355M/405M
F-64
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