REPAIR INSTRUCTIONS
Section I. CONTROL PANEL, RANGE AND POLARITY SELECTOR
SWITCHES, RHEOSTATS, AND RELAY PANEL ASSEMBLY
(m) Remove the relay panel assembly
6-1. General
All of the welding machine controls, instru-
(n) Refer to figure 6-1 and remove the
ments, receptacles, and connection devices except
control panel.
for the power and ground connections are
(2) Cleaning and Inspection
mounted to the control panel. The range selector
switch is used to select desired welding current
(a) Clean the control panel with an ap-
range and the polarity selector switch is used to
proved cleaning solvent and dry thoroughly.
select ac, dc, or dc reverse polarity. The output
(b) Inspect the control panel for dents,
control rheostat controls welding current within
breaks, cracks, scratches, or other damage. In-
the selected range. The phase shift and intensity
spect identification and instruction plates for ob-
rheostats are adjusted for best high frequency op-
literation of data.
erating conditions. The relay panel mounts the
(c) Replace a defective identification or in-
control relays, control and relay rectifiers, and a
struction plate or the control panel as necessary,
terminal board.
(3) Installation.
(a) Refer to figure 6-1 and install the con-
trol panel.
a. Model DAR300HFSG.
(b) Install the relay panel assembly (para
(1) Removal.
6-7) .
(a) Remove the side shrouds (para 3-13).
(c) Install the fuse and fuseholder (para
(b) Remove the output control rheostat.
3-18).
(d) Install the ground and electrode termi-
(c) Remove the post-purge and timed weld
nal board (para 3-25).
timers ( para 316).
(e) Install the terminal board door by in-
(d) Remove the electrical receptacles volt-
serting it in the control panel and bending the
meters ( para 3-17 ).
hinge tabs outwards 30 degrees.
(e) Remove the electrical receptacles (para
(f) Install the gas and water solenoid
3-18).
valves (para 3-27).
(f) Remove the toggle switches (para
(g) Install the range selector switch and
3-15).
polarity selector switch ( para 6-3).
(g) Remove the phase shift and intensity
(h) Install the phase shift and -intensity
rheostats (paras 65 and 6-6).
rheostats (paras 65 and 6-6).
(h) Remove the range selector switch and
(i) Install the toggle switches (para 3-15).
polarity selector switch (para 6-3).
(j) Install the electrical receptacles (para
(i) Remove the gas and water solenoid
318).
valves (para 3-27).
(k) Install the ac and de ammeters and
(j) Remove the terminal board door by
voltmeters (para 3-17).
straightening hinge tabs and removing from
(l) Install the post-purge and timed weld
panel.
timers (para 3-16).
(k) Remove the ground and electrode ter-
(m) Install the output control rheostat
minal board ( para 3-25).
(l) Remove the fuse and fuseholder (para
(n) Install the side shrouds (para 3-13).
3-18).
