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TROUBLESHOOTING & REPAIR
F-4 F-4
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.
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
OUTPUT PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
Machine is dead. No output - No
fan
The fan runs normally. No output
from the machine in either Stick or
TIG modes.
1. Make sure that the input power
switch is in the "ON" position and
the machine is plugged in.
2. Check the input voltage at the
machine. Input voltage must
match the rating plate and volt-
age connection. Refer to
Reconnect Procedure in the
Installation section of this manu-
al.
3. Blown or missing fuses in the
input line.
1. Check for proper input voltages
per nameplate and voltage
reconnect configuration.
2. Check to make sure the polarity
switch is in the proper position
and functioning correctly.
1. Check the input power switch
and associated wires for loose or
faulty connections.
2. Perform the T1 Transformer
Test.
1. Check for loose or faulty connec-
tions on the heavy current carry-
ing leads. (polarity switch, output
choke output terminals etc.)
2. Perform the T1 Transformer
Test.
3. Perform the SCR Bridge Test.
4. Check current control R1 for
proper operation. Normal resis-
tance is 10,000 ohms. Also
check associated leads for loose
or faulty connections.
5. The control board may be faulty.
Replace.