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DEDICATED SWITCHES
.------,
1
CPU Board
1
J205
1 -
-C~i~ ~r
Int~rfa~e B~ard - - ~
Coin Acceptor
1
1
or
1
J1
J3
1
Control Switches
o
B (U 5)
'1
1
ran~e- rown 17-
01
1
r-r-
4r-~"-
4
1
1
1
1
1
1
1
Orange-Red (U17-7) 02
1
~3
5
1
2
1
1
1
1
1
Orange-Black (U17-11) 03
1
1
3
2
6 r--o'
1
1
1
1
1
1
4
1
Orange-Yellow (U17-9) 04
1
1
7
1
1
1
1
1
1
1
Orange-Green (U16-9) 05
1
7
-;-0
6
1
1
1
1
1
1
Orange-Blue (U16-11) D6
1
~,
7
0
8
1
1
1
1
Orange-Violet (U16-7)
1
1
8
07
1
9
9
r-----o'
1
1
1
1
1
1
9 IOra!!Sl!l-Grall
(16-5)
Oil
1
8
1r-'-o'
1
1
1
1
1
1
1
Black
1
h5
3
1
__L~
1
'-
-
DEDICATED SWITCH CIRCUIT
r - - - - - -
-
- 1
1
CPU Board
Coin Acceptor Switches
01 Left Coin Chute
02 Center Coin Chute
03 Right Coin Chute
04 Forth Coin Chute
Control Switches
05 Normal Function: Service Credits
Test Function: Escape
06 Normal Function: Volume Down
Test Function: Down
07 Normal Function: Volume Up
Test Function: Up
08 Normal Function: Begin Test
Test Function: Enter
+5V
Coin Door
+12V
Interface
1
Board
1
1.2K
1
Coin Acceptor
J205
1
1
Jl
J3
1
or
A lN4148
1
Control Switch
X
1
Orange-XXX
1
X
Xi]
lK
Oedicated Input
1470 P
f
1
Black
15
I'
Switch
~ 0"
On
A
B C
H
L
H
L
Open
Closed
The dedicated switches operate similar to switches in the matrix except that instead of a column circuit there is a direct tie to
ground. Therefore, the column side is constantly active (low).
When a switch closes the row side (dedicated input) of the circuit activates. The "+" input to the LM339 drops below +5V
causing its output to go low. Since the row circuit (dedicated input) is tied directly to ground through the switch, the switch is
considered closed by the microprocessor. When the switch opens, the "+" input to the LM339 is above +5V, its output is high
I
and the row is inactive.
DOCTOR WHO 3-4