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TROUBLESHOOTING & REPAIR
F-6 F-6
SQUARE WAVE TIG 355
TROUBLESHOOTING GUIDE Observe Safety Guidelines
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
Fans and display are functional.
No output from machine in either
Stick or TIG modes.
1. The primary thermostat may be
open. Allow machine to cool.
2. If the machine is in Remote
control mode, make sure a
Lincoln remote control device
is connected to the amphenol.
3. If the machine works properly
in the Local control mode,
check or replace the remote
control device.
1. If the machine works properly
in Local control mode but not
in Remote control, then per-
form the Protection Board
Test.
2. If the machine does NOT have
output in either mode, Local or
Remote, check the primary
thermostat for proper opera-
tion. It is normally closed.
3. Perform the Arc Start Trigger
Circuit Test.
4. Perform the SCR Bridge Test.
5. Perform the Control
Transformer Test.
6. Perform the Power Board
Test.
7. The control board may be
faulty. Replace.