Lincoln Electric SQUARE WAVE TIG 355 Service Manual page 56

F-4
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
Major physical or electrical damage
is evident when the sheet metal
cover(s) are removed.
Machine is dead – no output – no
fans – no displays.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely,
contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed.
Call 1-888-935-3877.
TROUBLESHOOTING AND REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. Contact your local authorized
Lincoln Electric Field Service
Facility for technical assistance.
1. Check the input voltage at the
machine.
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
thermostat may be open. Allow
machine to cool.
CAUTION
SQUARE WAVE TIG 355
1. Contact the Lincoln Electric
Service Department, 1-888-935-
3877.
1. If when the "start" button is
Input voltage must pushed the pilot light is lit and the
input contactor (CR1) activates,
check the wiring at the reconnect
panel and also to the main trans-
former primary coils.
2. Perform the Input Contactor
Test.
3. Perform the Main Transformer
secondary
Test.
4. If when the "start" button is
pushed the pilot light does NOT
light and the input contactor does
NOT
start/stop button for proper oper-
ation.
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 acti-
vate,
Contactor Test.
RECOMMENDED
COURSE OF ACTION
activate, check the
perform the Input
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