Lincoln Electric POWER WAVE SVM156-A Service Manual page 51

F-5
TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
The machine is dead—no lights—
no output—the machine appears to
be off.
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely,
contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-800-833-9353.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. Make certain the input power
switch SW1 is in the ON posi-
tion.
2. Check the main input fuses (or
breakers). If open, replace or
reset.
3. Check the 6 amp CB4 breaker
located in the reconnect area.
Reset if tripped.
4. Make certain the reconnect
panel is configured correctly for
the applied input voltage.
CAUTION
POWER WAVE 455/R
Observe Safety Guidelines
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. Check the input power switch
SW1 for proper operation. Also
check the associated leads for
loose or faulty connections.
See the Wiring Diagram.
2. Check circuit breaker CB4 for
proper operation.
3. Perform the
Transformer Test.
4. The power board rectifier may
be faulty. Check rectifier and
associated wiring.
Wiring Diagram.
5. Perform the DC Bus Board
Test.
6. Perform the Power Board Test.
7. The Control Board may be
faulty.
F-5
T1 Auxiliary
See the