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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
No welding output. The 115 VAC is
present at the receptacle.
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. Make sure the polarity switch is
in the proper position and func-
tioning correctly.
2. One of the thermostats may be
tripped. Allow the machine to
cool. The thermal light will be
on.
3. Make sure the welding cables,
torch and connections are in
good operating condition.
1. Check for loose or faulty connec-
tions on the heavy current carry-
ing leads. ( Polarity switch, out-
put choke, output terminals, etc.)
2. Check for faulty connections or a
defective thermostat. Check
leads #213 and #214. See the
Wiring Diagram. The thermal
light will be on.
3. Perform the T1 Transformer
Test.
4. Perform the SCR Bridge Test.
5. Check the output controls R1, R4
and associated wiring. See
Wiring Diagram.
6. Check the J4 connection on the
control board.
7. The control board may be faulty.
CAUTION