Lincoln Electric POWER WAVE SVM173-A - Manual (Page 70)

TROUBLESHOOTING & REPAIR
F-24 F-24
POWER WAVE 455M/MSTT Retur
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DC BUS
POWER
SUPPLY
PC BOARD
CAPACITOR
C3
CAUTION!
J47
J46
J46 J47
3 4 5 6 7 8
LED
1 2 3 4 1 2
POWER BOARD
FAN RELAY
FIGURE F.7 – DC BUS POWER SUPPLY POWER SUPPLY PC BOARD
DC BUS POWER SUPPLY PC BOARD TEST (CONTINUED)
TEST PROCEDURE
1. Remove input power to the machine.
2. Using the 3/8” nut driver, remove the case
top.
3. Locate the DC Bus Power Supply PC Board
and plugs P46 and P47. See Figure F.7.
4. Carefully apply input power to the Power
Wave 455M.
ELECTRIC SHOCK can kill.
High voltage is present when
input power is applied to the
machine.
5. Turn on the Power Wave 455M. The LED on
the DC Bus Power Supply PC Board should
light.
WARNING