Lincoln Electric SQUARE WAVE TIG 355 Service Manual page 61

F-9
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
In Stick mode the machine welds at
a very low output, regardless of the
peak current control setting.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely,
contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed.
Call 1-888-935-3877.
TROUBLESHOOTING AND REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
FUNCTION PROBLEMS
1. If the machine is in the Remote
control mode, make sure a
Lincoln remote control device is
connected to the amphenol.
2. The Start Current may be set too
low for the electrode size being
used.
3. If the machine works properly in
Local control mode, check or
replace the
device.
4. If the machine works properly in
TIG mode, contact your local
authorized Lincoln Electric Field
Service Facility.
CAUTION
SQUARE WAVE TIG 355
COURSE OF ACTION
1. If the machine works properly in
Local control mode but not in
Remote mode, perform the
Protection Board Test.
2. If the machine operates proper-
ly in TIG mode but not in Stick
mode, the control board may be
faulty. Replace.
3. If the output is low in all modes,
remote control perform the Static & Active
SCR Bridge Tests.
4. The power board may be faulty.
Replace.
5. The control board may be faulty.
Replace.
F-9
RECOMMENDED