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PRECISION TIG 185
TROUBLESHOOTING & REPAIR
F-12 F-12
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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
1-888-935-3877.
TIG WELDING PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
No high frequency. Machine is in
the TIG mode and has normal out-
put.
No gas flow when Amptrol is activat-
ed in the TIG mode. Machine has
normal output - fan runs.
A "click" can be heard indicating that
the gas solenoid valve is operating.
1. If the machine location is in a
highly dirty environment with con-
ductive contaminants, check and
clean the spark gap with a low
pressure air stream per the main-
tenance instructions.
2. Check spark gap operation and
setting. Normal is (0.020").
Refer to Maintenance section of
this manual.
1. The gas supply is either empty or
not turned on.
2. The flow regulator may be set
too low.
3. Check the gas hose for kinks or
blockages.
4. Check the filter screen inside gas
inlet fitting to solenoid valve.
1. Check the high voltage trans-
former (T3). The normal resis-
tance of the secondary winding
of the high voltage transformer is
12.5k ohms.
ELECTRIC SHOCK CAN
KILL. When 115VAC is
applied to the primary of
T3. A very high voltage is devel-
oped on the secondary winding.
For assistance call the Lincoln
Electric Service Department 1-888-
935-3877.
------------------------------------------------
2. Check the values of R3, and C4.
3. Perform the T1 Transformer Test.
4. The control board may be faulty.
Replace.
1. Possible gas supply problems.
Consult your local welder/gas dis-
tributor.
WARNING