Lincoln Electric POWER WAVE SVM135-B Service Manual page 108

F-44
2
1 3
J32
4 6
5
TEST PROCEDURE
1. Remove input power to the Power
Wave 455.
2. Using the 3/8 in. nutdriver, remove the
case sides and top.
3. Perform the Capacitor Discharge
Procedure.
4. Locate the power board and plugs J31
and J32. Also locate leads #51 (black)
and #50 (white). Do not remove plugs
or leads from the power board. Refer
to Figure F.10.
5. Carefully apply the correct input voltage
to the Power Wave 455.
TROUBLESHOOTING AND REPAIR
POWER BOARD TEST (continued)
FIGURE F.10 — POWER BOARD TEST.
1 2 3 4 5
6
J31
91011
7 8 12
POWER WAVE 455/POWER FEED 10
51 50
BK WT
B2 B1
6. Carefully test for the correct voltages at
the power board as per Table F.4.
NOTE: Capacitor C3 (25000 mfd/100 V)
may hold a charge. Do not come in con-
tact with the capacitor terminals.
7. If the 65 VDC is low or not present at
plug J32, check the rectifier bridge and
C3 filter capacitor. See wiring diagram.
Also perform the T1 Auxiliary
Transformer Test.
8. If any of the DC voltages are low, or not
present, at plug J31, the power board
may be faulty.
9. Install the case sides and top using the
3/8 in. nutdriver.
F-44