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TROUBLESHOOTING & REPAIR
F-7 F-7
SQUARE WAVE TIG 355
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
216-383-2531 or 1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
The machine shuts off (pilot light
goes out and the fans stop) when
the Arc Start Switch or Amptrol is
activated.
1. The input voltage may be too
high (more than 10% over
rated).
2. The Arc Start switch may be
faulty. Check or replace.
1. Perform the SCR Bridge Test.
2. Perform the Power Board
Test.
3. Perform the Control Board
Test.
4. Shunt may be faulty or over-
heated. Check for loose con-
nections and replace shunt if
necessary.
The 115VAC receptacle does not
work. The machine operates nor-
mally.
1. The circuit breaker CB1 may
have opened. Reset if neces-
sary.
2. Check for the presence of
115VAC at the receptacle.
1. The circuit breaker may be
faulty. Test or replace.
2. If the fans are running, check
the receptacle and the associ-
ated wiring.
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