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SQUARE WAVE TIG 255
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F-3
TROUBLESHOOTING & REPAIR
TROUBLESHOOTING GUIDE
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
Major Physical or Electrical
Damage is Evident.
Machine is Dead -
No Output - No Fan
No Displays.
Fan runs - Display and control
panel dark. No output from
machine in either Stick or TIG
modes.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
1. Contact The Lincoln Electric
Service Dept. (216) 383-2531
or 1-800-833-9353 (WELD).
1. Make certain that the input
power switch is in the “ON”
position.
2. Check the input voltage at the
machine. Input voltage must
match the rating plate and
reconnect the panel.
3. Blown or missing fuses in
input line.
1. Check for proper input
voltages. As per nameplate
and reconnect panel.
RECOMMENDED
COURSE OF ACTION
1. Check input power switch (S1).
It may be faulty.
2. Check for open or broken pri-
mary leads to main transformer
(T1).
3. Check auxiliary (115vac) power
winding in the main transformer
(T1).
1. Secondary thermostat may be
open. Check for glowing yel-
low light on front panel
2. Control transformer (T2) may
be faulty. See Control
Transformer Voltage Test.
3. Protection/Snubber board may
be faulty. See
Protection/Snubber Board
Continuity Test.
4. Control Board may be faulty.
Replace.
OUTPUT PROBLEMS
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 216-383-2531 or 1-800-833-9353.
CAUTION
12/95