Lincoln Electric POWER WAVE SVM156-A Service Manual page 93

F-47
AUXILIARY TRANSFORMER NO. 2 TEST (CONTINUED)
TEST PROCEDURE
1. Remove the main input power to the Power
Wave 455/R machine.
2. Remove any load that may be connected to
the 115 VAC receptacle.
3. Using the 3/8" nut driver, remove the case
top.
4. Locate plugs P52 and P50 at the Auxiliary
Transformer No. 2. Refer to Figure F.17.
5. Carefully apply the correct input power.
TROUBLESHOOTING & REPAIR
FIGURE F.17 – AUXILIARY TRANSFORMER NO. 2 TEST
WARNING
ELECTRIC SHOCK can kill.
High voltage is present at both
plugs.
POWER WAVE 455/R
H4 H3 H1
1 2 3
VIEWED FROM
TRANSFORMER
LEAD SIDE
4 5 6
H5 H6 H2
P50
350 352
1 2
VIEWED FROM
TRANSFORMER
LEAD END
3 4
33A
P52
6. Check for 115 VAC at plug P52 pins 1 and
4 (leads 350 to 33A). Check for 230 VAC
at plug P52 pins 1 and 2 (leads 350 to
352).
7. If 115 VAC and 230 VAC are present,
Auxiliary Transformer No. 2 is good.
8. If 115 is not present between pins 1 and 4,
and 230 VAC is not present between pins 1
and 2, check the associated leads and
plugs for loose or faulty connections.
9. Carefully test for the correct AC input volt-
age applied to the primary windings at plug
P50. See the Wiring Diagram.
10. If the correct AC input voltage is applied to
the primary of the Auxiliary Transformer
No. 2 and the secondary voltage is NOT
correct, the transformer may be faulty.
Replace.
11. Replace any cables ties and insulation
removed earlier.
12. Install the case top using the 3/8" nut dri-
F-47