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TROUBLESHOOTING & REPAIR
F-9 F-9
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
FUNCTION PROBLEMS
1. In Stick mode the machine
welds at a very low output,
regardless of the peak current
control setting.
1. If the machine is in the Remote
control mode, make sure a
Lincoln remote control device
is connected to the amphenol.
2. The Start Current may be set
too low for the electrode size
being used.
3. If the machine works properly
in Local control mode, check
or replace the remote control
device.
4. If the machine works properly
in TIG mode, contact your
local authorized Lincoln
Electric Field Service Facility.
1. If the machine works properly
in Local control mode but not
in Remote mode, perform the
Protection Board Test.
2. If the machine operates prop-
erly in TIG mode but not in
Stick mode, the control board
may be faulty. Replace.
3. If the output is low in all
modes, perform the SCR
Bridge Test.
4. The power board may be
faulty. Replace.
5. The control board may be
faulty. Replace.