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The machine has welding output in
the Stick mode but no output in the
TIG mode. ( no gas flow or high fre-
quency).
SEE NOTE BELOW
1. Make sure the Stick/TIG switch
is in the proper position and
operating correctly.
2. The remote control device may
be faulty.
1. Check the remote control recep-
tacle and associated wiring. See
the Wiring Diagram.
2. Perform the Protection Board
Test.
3. Check the J11 plug on the con-
trol board. See the Wiring
Diagram.
4. The control board may be faulty.
The machine welds at a very low
output regardless of the current
control setting.
NOTE: BEFORE REPLACING A
CONTROL BOARD
If an Advanced Control Panel is
installed, remove it and replace
the Jumper in connector J-3. If
the machine functions normally,
the Advanced Process panel or
harness is defective.
1. If welding in the TIG mode, the
remote control device may be
defective.
2. Make certain the input line volt-
age is correct for the machineʼs
reconnect configuration.
3. Check the welding cables and/
or torch for loose or faulty con-
nections.
1. Check the polarity switch and
associated leads.
2. Check the interior connections of
the heavy current carrying leads.
3. Perform the SCR Bridge Test.
4. Perform the T1 Transformer
Test.
5. Check the output current con-
trols for proper operation.
Normal resistance is 10,000
ohms. See the Wiring Diagram.
6. The control board may be faulty.
F-7F-7
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 does not have welding
output in the Stick mode. The
machine operates correctly in the
TIG mode.
SEE NOTE BELOW
1. Check the electrode cable and
holder for loose or faulty connec-
tions.
2. Make sure the Stick/TIG switch is
in the proper position and operat-
ing correctly.
1. Check the Stick/TIG switch and
associated leads. See the Wiring
Diagram.
2. The control board may be faulty.
CAUTION