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TROUBLESHOOTING & REPAIR
F-16 F-16
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
TIG MODE PROBLEMS
The machine output is intermit-
tently lost. Gas flow and high fre-
quency are also interrupted.
1. The problem may be caused
by high frequency inteference.
Make sure that the machine is
grounded properly according
to the installation instructions.
If there are other high frequen-
cy sources in the area, make
certain they are grounded
properly.
2. Check the Arc Start switch or
Amptrol for proper operation
and loose connections.
1. The machine internal ground
connections may be loose.
Check the mounting screws on
the protection board, the
bypass boards, and the feed-
thru board.
2. The protection or bypass
boards may be faulty. Check
or replace.
3. Perform the Arc Start Trigger
Circuit Test.
The arc “flutters” when TIG weld-
ing.
1. The tungsten electrode may be
too large in diameter.
2. The tungsten electrode may
needed sharpening.
3. If helium shielding gas is used,
reduce the percentaghe of heli-
um.
4. Adjust the gas flow rate to the
proper level for the process
being used.
5. Check gas hoses and connec-
tions for leaks.
1. Check for loose shunt connec-
tions, leads #222 and #221.
See Wiring Diagram.
2. Check polarity switch for loose
or faulty connections.
3. Perform the SCR Rectifier
Bridge Tests.
4. Check components R6 and C6
in the high voltage transformer
primary circuit. Replace if nec-
essary.
5. The control board may be
faulty. Replace.
6. The power board may be
faulty. Replace.