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PRECISION TIG 275
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TROUBLESHOOTING & REPAIR
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
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 1-888-935-3877.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
The machine makes a very loud
buzzing noise in DC Stick or in DC
TIG modes. There is no current
draw from the machineʼs output ter-
minals. (The machine is not exter-
nally loaded).
1. Inspect the output terminal insu-
lators for cracks or signs of over-
heating.
1. Diode D1 may be shorted.
Check and replace if necessary.
2. Check the polarity switch (S2) for
proper function and correct con-
nections.
3. Perform the SCR Bridge Tests.
CAUTION