Lincoln Electric PRECISION TIG SVM186-A Service Manual page 52

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Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
No high frequency. Machine is in
the TIG mode and has normal out-
put.
No gas flow when Amptrol is acti-
vated in the TIG mode. Machine
has normal output - fan runs.
A "click" can be heard indicating
that the gas solenoid valve is oper-
ating.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely,
contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed.
Call 1-888-935-3877.
TROUBLESHOOTING AND REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. If the machine location is in a
highly dirty environment with
conductive contaminant's, check
and clean the spark gap with a
low pressure air stream per the
maintenance 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.
CAUTION
PRECISION TIG® 225
RECOMMENDED
COURSE OF ACTION
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.
WARNING
ELECTRIC SHOCK CAN
KILL. When 115VAC is
applied to the primary of T3. A
very high voltage is developed 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.
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