Lincoln Electric POWER WAVE 355M - Manual (Page 74)

TEST PROCEDURE
1. Remove input power to the machine.
2. Using the 3/8” nut driver, remove the wrap-
around cover.
3. Locate the DC Bus Board. See Figure F.5.
4. Carefully apply input power to the Power
Wave 355M/405M.
ELECTRIC SHOCK can kill.
High voltage is present when
input power is applied to the
machine.
5. Turn on the Power Wave 355M/405M. The
LED on the DC Bus Power Supply PC Board
should light.
TROUBLESHOOTING AND REPAIR F-28 F-28
POWER WAVE 355M/405M
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DC BUS BOARD
W AR NIN G
RE M OT E
PO W ER
OF F
ON
ST AT US
TH ER M AL
LIN CO LN ELE CTR IC
FIGURE F.5 – DC BUS POWER SUPPLY POWER SUPPLY PC BOARD
FIGURE F.6 – DC BUS POWER SUPPLY POWER SUPPLY PC BOARD
DC BUS BOARD TEST (CONTINUED)
J46
J47
475
52
51
477
66 65
L
1 1
0
7
8
-1
J46
J47
Thermostat
Bus
Rectifier
WARNING