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14
TROUBLESHOOTING
14
SQUARE WAVE TIG 175
Observe all Safety Guidelines detailed throughout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local
Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
OUTPUT PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
Machine is Dead -
No Output - No Fan
Output is present
No Fan, High Frequency,
Lights, or Gas Solenoid
Fan runs - No output from machine
in either Stick or TIG (2/4 Step)
modes.
Fan runs - No output from machine
in either Stick or TIG (2/4 Step)
modes and the yellow light on the
control panel is on.
Machine does not respond (no gas
flow, no high frequency and no open
circuit voltage) when arc start switch
or Amptrol is activated - fan is work-
ing.
1. Make certain that the input
power switch is in the “ON”
position and machine is plugged in.
2. Check the input voltage at the
machine. Input voltage must
match the rating plate and voltage
connection. Refer to Reconnect
Procedure in the Installation sec-
tion of this manual.
3. Blown or missing fuses in
input line.
1. Check 5A fuse F1 located next
to the control PC board on the
left side of the machine.
1. Check for proper input voltages
per nameplate and voltage
reconnection.
2. Check to make sure polarity
switch is not in between two
positions.
1. Welding application may have
exceed the recommended duty
cycle. Allow the unit to run until
the fan cools the unit and the
yellow light goes out.
1. Machine MUST be in
the TIG Mode.
2. The Amptrol may be defective.
Check for continuity between
pins “D” and “E” on cable con-
nector when Amptrol is
depressed.
Contact your Local Lincoln Authorized
Field Service Facility for technical
troubleshooting assistance.