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(8) Remove all hardware from the nine momentary action toggle switches and discard the
flat washers. Finger tighten one of the nuts against each switch body and then temporarily
secure each toggle switch to the front panel. The lockwashers should be behind the panel,
and the front panel nuts should also be only finger-tight.
IMPORTANT: make certain the
bat handles are pointing upward on all the switches, so that the handles are pressed down
to actuate the switch.
(9) In the same way, temporarily mount the SPDT miniature snap-action toggle switch
S302 to the front panel. The switch mounts sideways, in either direction
.
(10) DO NOT attach the plastic DPDT AC power switch to the front panel. It will be
installed later.
(11) Temporarily attach the circuit board to the front panel, adjusting the switches as
necessary to make sure their pins fit into the mating holes on the circuit board, and that
the LCD fits into the square cutout on the front panel. Use the slight bit of wiggle room
on the LCD mounting screws to center the LCD into its cutout. When you are certain the
switch bodies are snug against the circuit board, and that the LCD is flush with the front
of the panel, and after you have double-checked that no switches are mounted upside
down, then solder all the switch pins to the circuit board. Now tighten the LCD mounting
screws on the rear side of the printed circuit board
(12) Detach the front panel from the circuit board, taking care not to lose the outer nut
and lockwasher from each switch.
Hint: note that the nuts on S302 are slightly smaller
than the nuts on the momentary action switches, so don’t get them mixed up.
Now tighten
the top screws on the LCD spacers and solder all the pins on both ends of J305 (32 solder
connections in total).
(13) Mount the plastic DPDT AC power switch S301 on the front panel (it goes either
way). The nut should be finger tight. Now set the front panel aside.
AC Power Switch S301
(14) Identify all the jacks that mount on the front panel: two microphone jacks, the 1/4 in.
key jack (J301), the 1/4 in. headphone jack (J302), and the 3.5mm headphone jack
(J303). As illustrated below, bend the solder lugs out flat on the key jack, so that they
won’t touch the printed circuit board when installed. Don’t mix up the two 1/4 in. jacks;
the J302 jack has a black plastic shell.
