Lincoln Electric PRECISION TIG 185 SVM169-A Service Manual page 54

F-16
HIGH FREQUENCY CIRCUIT DISABLE PROCEDURE
PROCEDURE
1. Remove input power to the TIG185
machine.
2. Using the 3/8" nutdriver remove the
right side panel.
3. Locate the Spark Gap Assembly at
the right side of the machine. See
Figure F.1.
4. With the 5/64" Allen type wrench
loosen the set screw holding the
upper electrode in place.
LEFT SIDE OF MACHINE
TROUBLESHOOTING & REPAIR
FIGURE F.1 SPARK GAP ASSEMBLY
PRECISION TIG 185
5. Increase the distance between the
electrodes to at least 3/8" by sliding
one electrode away from the other
electrode. Secure the one electrode
in this position.
6. This should disable the high frequen-
cy circuit. Visually check to make
sure high frequency sparking is
NOT present before connecting
any test equipment to the TIG 185
machine.
7. When voltage testing and scope
measurements are complete reset
the spark gap electrodes to .020" air
gap. Tighten the set screw using the
5/64" Allen wrench.
.020
.015 Spark Gap
F-16