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TROUBLESHOOTING & REPAIR
F-18 F-18
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
When using Crater Fill the arc
goes out before the final crater fill
current level is reached.
1. The Crater Fill % Peak Current
control may be set too low for
the tungsten being used.
Increase the Crater Fill % Peak
Current control until the final
crater fill current is within the
tungsten’s operating range.
2. If using the Pulser in conjunc-
tion with the Crater Fill, the
Background % Peak Current
may be too low for the tung-
sten as the current is
downsloping in crater fill. The
best solution is to increase the
Background % Peak Current
level.
3. If welding with AC, use
“Continuous” high frequency.
The high frequency will stabi-
lize the arc as the current goes
down.
1. Check the Crater Fill Fade Out
control potentiometer for cor-
rect resistance and proper
operation.
2. The control board may be
faulty. Replace.