TM 5-3431-203-15
b. Installation.
(1) Refer to figure 3-13 and install the
thermostatic switch.
(2) Install the welder top and housing
3-43. Dummy Plug
a. Removal.
(1) Unlock and lower the high frequency
panel door.
(2) Refer to figure 3-9 and remove the
dummy plug.
b. Installation.
(1) Refer to figure 3-9 and install the
dummy plug.
(2) Close and lock the high frequency
Figure 3-13. Thermostatic switch, removal and
panel door.
installation.
Section IX. SPARK GAP ADJUSTER, VOLTAGE CHANGE BARS,
AND GROUND AND ELECTRODE TERMINAL BOARD
b. Installation.
3-44. General
(1) Refer to figure 3-14 and install the
The primary purpose of the spark gap ad-
spark gap adjuster.
juster is to control the stability of the high
(2) Install the high frequency panel as-
frequency arc. The purpose of the voltage
sembly (para 3-27).
change bars is to allow the welding ma-
Refer to figure 3-14 and
c. Adjustment.
chine to operate from either 230 or 460 volts
adjust the spark gap.
by the correct changing of the bars. The
ground, and electrode cable terminal lugs are
3-46. Voltage Change Bars
connected by brass nuts to the studs on the
a. Removal.
ground and electrode terminal board.
(1) Remove the two securing screws and
raise the voltage change bar access
3-45. Spark Gap Adjuster
door on the rear of the welding ma-
chine.
a. Removal.
(2) Refer to figure 3-15 and remove the
(1) Remove the high frequency panel
voltage change bars.
assembly ( para 3-27).
b. Installation.
(1) Refer to figure 3-15 and install the
(2) Refer to figure 3-14 and remove the
voltage change bars.
spark gap adjuster.
3-14