Lincoln Electric POWER WAVE 355/405 SVM159-A Service Manual page 66

F-24
6
3
TEST PROCEDURE
1. Remove input power to the Power Wave
355/405.
2. Using the 3/8" nut driver, remove the case
top.
3. Perform the
Procedure.
4. Locate the Power Board and plugs J42 and
J43. Do not remove plugs or leads from
the Power Board. Refer to Figure F.8.
5. Carefully apply input power to the Power
Wave 355/405.
WARNING
ELECTRIC SHOCK can kill.
High voltage is present when
input power is applied to the
machine.
TROUBLESHOOTING & REPAIR
POWER BOARD TEST (CONTINUED)
FIGURE F.4 – POWER BOARD TEST
J42 J41
4 3
5 4
2 1
2 1
J42
Capacitor Discharge
POWER WAVE 355/405
J43
12 11 10 9
6 5 4 3
J43
J41
6. Turn on the Power Wave 355/405. Carefully
test for the correct voltages at the Power
Board according to Table F.4.
7. If either of the 40 VDC voltages is low or not
present at plug J41, perform the DC Bus PC
Board Test. See the Wiring Diagram. Also
perform the T1 Auxiliary
Test.
8. If any of the DC voltages are low or not pre-
sent at plugs J42 and/or 43, the Power
Board may be faulty.
9. Install the case top using the 3/8" nut driver.
F-24
8 7
2 1
Transformer