Lincoln Electric PRECISION TIG 185 SVM169-A Service Manual page 46

F-8
TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
Machine output is intermittently lost.
Gas flow and high frequency are
also interrupted.
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.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
TIG MODE PROBLEMS
1. The problem may be caused by
high frequency interference.
Make sure that the machine is
grounded properly according to
the installation instructions. If
there are other high frequency
sources in the area, make certain
that they are grounded properly.
2. Make sure the Amptrol is operat-
ing properly.
3. Check to make sure that the
input voltage is correct for the
machine reconnect configuration.
Refer to Reconnect Procedure
in the Installation section of this
manual.
CAUTION
PRECISION TIG 185
Observe Safety Guidelines
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. Check for loose or faulty connec-
tion on the leads between the
remote receptacle and plug J5
on the control board. See wiring
diagram.
2. Check the plugs on the control
board for loose connections.
3. The control board may be faulty.
F-8