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TROUBLESHOOTING & REPAIR
F-8 F-8
SQUARE WAVE TIG 275
Observe Safety Guidelines TROUBLESHOOTING GUIDE
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
216-383-2531 or 1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
The machine welds at a very high
output regardless of the current
control setting.
1. If welding in the TIG mode, the
remote control device may be
defective.
1. Perform the
SCR Bridge Test.
2. Perform the
T1 Transformer
Test.
3. Check the current control for
proper operation. Normal resis-
tance is 10,000 ohms. See the
Wiring Diagram.
4. Check leads #221 and #222
between the output shunt and
the control board. See the
Wiring Diagram.
5. The control board may be faulty.
Accessories plugged into the 115
volt receptacle do not work. (220
VAC receptacle on European mod-
els only).
1. Make sure the accessory, plug
and associated leads are in
good working condition.
2. Make certain the correct input
voltage is being applied to the
machine. (The reconnect lead
must be in the correct position.)
3. The circuit breaker may be
tripped. Reset if necessary.
1. The circuit breaker (CB) may be
faulty.
2. Check the receptacle and asso-
ciated leads for loose or faulty
connections.
3. Perform the
T1 Transformer
Test.