Lincoln Electric Precision TIG 375, Service Manual, Page: 63 / 143

F-17 F-17
PRECISION TIG 375
PROBLEMS
(SYMPTOMS) POSSIBLE AREAS OF
MISADJUSTMENT(S) RECOMMENDED
COURSE OF ACTION
FUNCTION PROBLEMS
The AC wave balance control does
not function properly.
1. The AC wave balance control is
operational only in the TIG mode.
1. Check the AC balance control
(R2) and associated leads for
loose or faulty connections. See
the Wiring Diagram.
2. The control board may be faulty.
Gas pre-flow and post-flow time is
too long.
1. If an advanced control board is
installed, check dip switch set-
ting on the board. See
Installation Manual.
1. Check plug J3 on the control
board. Either the jumper plug or
the advanced control board must
be plugged into J3.
TROUBLESHOOTING & REPAIR
TROUBLESHOOTING GUIDE
Observe Safety Guidelines
detailed in the beginning of this manual.
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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.