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TROUBLESHOOTING & REPAIR
F-10 F-10
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
FUNCTION PROBLEMS
The machine welds at very high
outputs, regardless of the Peak
Current control setting.
1. Make sure the start controls
are set correctly for the
process being used.
2. If the machine is in Remote
control mode, change modes
to Local control. If the prob-
lem is resolved, the remote
control unit may be defective.
1. Perform the SCR Bridge Test.
2. The power board may be
faulty. Replace.
3. The control board may be
faulty. Replace.
The Arc Force control has no
effect on the arc.
1. The Arc Force control is active
only in the Stick mode.
2. The effect of the Arc Force
control will be less noticeable
at high welding currents. Weld
at low currents (less than 150
amps) and check the Arc Force
control function.
1. Check the Arc Force control
potentiometer for correct resis-
tance and proper operation.
2. Check the continuity of leads
#441 and #445. See Wiring
Diagram.
3. The control board may be
faulty. Replace.
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