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TROUBLESHOOTING & REPAIR
F-4 F-4
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
Major physical or electrical dam-
age is evident when the sheet
metal cover(s) are removed.
1. Contact your local authorized
Lincoln Electric Field Service
Facility for technical assis-
tance.
1. Contact the Lincoln Electric
Service Department, 216-383-
2531 or 1-800-833-9353
(WELD).
Machine is dead – no output – no
fans – no displays.
1. Check the input voltage at the
machine. Input voltage must
match the rating plate and the
reconnect panel.
2. Check for blown or missing
fuses in the input lines.
3. Check for a blown or missing
control circuit fuse F1.
4. The machine secondary
thermostat may be open.
Allow machine to cool.
1. If when the “start” button is
pushed the pilot light is lit and
the input contactor (CR1) acti-
vates, check the wiring at the
reconnect panel and also to
the main transformer primary
coils.
2. Perform the Input Contactor
Test.
3. Perform the Main Transformer
Test.
4. If when the “start” button is
pushed the pilot light does
NOT light and the input con-
tactor does NOT activate,
check the start/stop button for
proper operation.
5. Perform the Pilot Transformer
Test.
6. If when the “start” button is
pushed the pilot light is lit and
the input contactor does NOT
activate, perform the Input
Contactor Test.