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TROUBLESHOOTING & REPAIR
F-5 F-5
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
The input contactor activates
when “start” button is pushed but
will NOT stay closed. Machine
shuts off when “start” button is
released.
1. Check the input voltage at the
machine. Input voltage must
match the rating plate and the
reconnect panel.
2. Blown or missing control cir-
cuit fuse (F1).
1. Perform the Input Contactor
Test.
2. Perform the Control
Transformer Test.
3. Perform the Feed – Thru PC
Board Test.
4. Perform the Control Board
Interlock Test.
5. The power board may be
faulty. Replace.
The machine shuts off and the
control fuse (F1) repeatedly fails.
1. Check the input voltage at the
machine. Input voltage must
match the rating plate and the
reconnect panel.
2. Make sure the fuse is the cor-
rect rating (1/2 amp).
3. The input voltage may be too
high (more than 10% over
rated).
1. Perform the Control
Transformer Test.
2. Perform the Power Board
Test.
3. The control board may be
faulty. Replace.