Power Transformer; Joysticks; Joystick Schematic - Tandy 26-3334 Service Manual

5.13 Power Transformer
The Color Computer
3
power
transformer accepts
120
VAC, 60 Hz
(240 VAC, 50Hz: PAL) input and
transforms
it to 16.2 VAC (18.52
VAC:
PAL) center-tapped
for use by the
power supply. The current rating of
the secondary
of the transformer
is
AC 2.2 amps (AC1.0
amps: PAL). The
transformer should only
be replaced
with genuine Tandy replacement
parts.
5.14 Joysticks
The optional joystick controllers are
two identical assemblies which can be
plugged into
JK1 and JK2. Figure 5-15
shows
a
schematic
of the
Joystick
Assembly,
It
simply consists
of a
push-button switch
for the fire
button and
the dual potentiometers
connected
by
a
mechanical assembly.
The mechanical assembly allows both
potentiometers
to be
changed
at the
same time. This gives the effect of
a
two-dimensional control.
The potentiometers
are connected
so
that
5
volts are applied
to one side
of the variable resistor, and ground
is
connected
to the other. This
allows
the
center wiper
to
vary from
to
5
volts
as the
handle
is
moved.
The push-button switch merely
provides
a
momentary ground contact
for an input signal.
WHITE
+5V
A
2
100K
A
2
1C
3
00K
m
GND
LUG
Figure 5-15. Joystick Schematic
-52-