h. Carefully position the wires so that they do not
3-47. Toggle Switch Cable Assembly
contact any components.
i. Remount the switch (with the yellow wire up)
Replace the signal data converter noise suppression
and tighten the retaining nut.
switch (S301) cable assembly as follows (fig. FO-3
3-48. Replace Relay in Power Supply
a. Remove the nut holding the switch and remove
the switch from its bracket to provide access to its
To replace relay K401, snap back the retainer clip and
remove the relay. Install the new relay in the socket
b. Mark the position of the yellow wire on the
after insuring that the key on the relay aligns with
switch and remove all three leads to the switch.
the key on the relay socket. Reinstall the retainer
c. Unsolder the yellow wire and two green wires
from the terminal board.
d. Connect one end of the new yellow wire to the
3-49. Fan Motor and Blade Replacement
(previously marked yellow wire terminal) switch.
(fig. 3-5 and FO-9)
Connect the other end of the yellow wire to the termi-
Replace the fan motor and blade assembly by first
nal to which resistor R303 and a yellow wire are
tagging, then electrically disconnecting the fan leads
from terminal strip E 1, then removing the three nuts
e. Attach one end of one green wire to the center of
holding the motor to the bracket. The fan may be
the switch. Attach the other end of this green wire to
detached from the motor by loosening the setscrew
the terminal to which resistor R307 and a green wire
and removing the blade. To install, slide the fan blade
on the new motor shaft and tighten the setscrew.
f. Attach one end of the other green wire to the
Mount the motor to the panel and install the three
remaining terminal on the switch. Attach the other
mounting nuts. Electrically connect the motor leads
end of this green wire to the terminal to which capaci-
terminal block E 1. (Refer to fig. FO-9 for connection
tor C302 and a green wire are attached.
connections just made.