Lincoln Electric SQUARE WAVE TIG 355 Service Manual page 58

F-6
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
Fans and display are functional. No
output from machine in either Stick
or TIG modes.
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)
OUTPUT PROBLEMS
1. The primary thermostat may be
open. Allow machine to cool.
2. If the machine is in Remote con-
trol mode, make sure a Lincoln
remote control device is connect-
ed to the amphenol.
3. If the machine works properly in
the Local control mode, check or
replace the
device.
CAUTION
SQUARE WAVE TIG 355
COURSE OF ACTION
1. If the machine works properly in
Local control mode but not in
Remote control, then perform
the Protection Board Test.
2. If the machine does NOT have
output in either mode, Local or
Remote, check the primary
thermostat for proper operation.
It is normally closed.
remote control
3. Perform the Arc Start Trigger
Circuit Test.
4. Perform the Static & Active
SCR Bridge Tests.
5. Perform
Transformer Test.
6. Perform the Power Board Test.
7. The control board may be faulty.
Replace.
F-6
RECOMMENDED
the Control