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TROUBLESHOOTING & REPAIR
F-5 F-5
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
PRECISION TIG 185
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
1-888-935-3877.
OUTPUT PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
Fan runs - No output from machine
in either Stick or TIG modes and the
yellow light on the control panel is
on.
The machine does not respond (no
gas flow, no high frequency and no
open circuit voltage) when the arc
start switch or Amptrol is activated -
fan is working normally.
1. The welding application may
have exceeded the recommend-
ed duty cycle. Allow the unit to
run until the fan cools the unit
and the yellow light goes out.
2. The air louvers may be blocked.
Remove air obstruction and allow
unit to cool.
1. Make certain the machine is in
the TIG mode.
2. The Amptrol may be defective.
Check for continuity(zero ohms)
between pins "D" and "E" on
cable connector when the
Amptrol is depressed.
1. One of the thermostats may be
faulty. Check or replace. See
wiring diagram.
2. Check for loose or faulty wires on
the thermostats and associated
circuitry. See wiring diagram.
1. Check the continuity (zero ohms)
of the leads between the remote
receptacle and plug J5 on the
control board. See wiring dia-
gram.
2. Perform the T1 Transformer
Test.
3. The control board may be faulty.
Replace.