Filter
Top Products
F-8F-8
PRECISION TIG 275
TROUBLESHOOTING & REPAIR
Observe Safety Guidelines TROUBLESHOOTING GUIDE
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 welds at a very high
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.
1. Perform the SCR Bridge Test.
2. Perform the T1 Transformer
Test.
3. Check the output current con-
trols for proper operation.
Normal resistance 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 volt
receptacle do not work.
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 CB1 may be
tripped. Reset if necessary.
4. Only the top part of the recepta-
cle is electronically “Hot” all of
the time.
1. The circuit breaker (CB1) may be
faulty.
2. Check the receptacle and asso-
ciated leads for loose or faulty
connections.
3. Perform the T1 Transformer
Test.
Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC
Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC
CAUTION