Basic HTML Version
SWITCH MATRIX
White
0-
Green
1
2
4
5
6
7
6
D8d~
G_
o-
0-
0-
G_ GI'MfIo G_
FUPI*'
Groundlcl
Brown
Red
Yellow Bleck
Blue
Violet
OnlY
Groundlcl
Switch ••
J207-1
J207-2
J207-4
J207-5
J207-6
J207-7
J207-9
Switch ••
U20-18
U20-17
U20-15
U20-14
U20-13
U20-12
U20-11
oranga-Brown (1)
NOT
SLAt.!
LOCK
J205-1
LEFT
LOOP
USED
TILT
1
SliNG
RIGHT
Left Coin Chute
01
Orange-Red
(2)
J2Q5.2
Center
CoIn Chute
D2
Orange-Black
(3)
J205-3
Right Coin Chute D3
Ol$nge-Yellow (4)
J206-4
4th Coin Chute D4
Orange-Blue (6)
J2C5-7
=n
I:;:""
VolDown Down OS
Orange-Violet
(7)
J205-8
",,,,,Ii
F..-n
Vol Up
Orange-Gray
(8)
J205-9
No",,"
1
T.,
Ftr<IOn
Ftrdon
BegIn Test Ent",
08
SWITCH MATRIX CIRCUIT
Inactive
Plcytield Active
Column
Off
On
Column (example)
LS37~SC
+5V
+12V
,
,
,
:.. __ w
.
J
White-XXX
Row
Row (example)
Switch Open
Switch Closed
The microprocessor is constantly strobing the column side of the switch. When point "A" on the column circuit toggles low, the
column side is active.
When a switch closes, the row side of the circuit activates. The "+' input to the LM339 drops below +5V causing its output to go
low. Corresponding row and column switches must be low at the same time for the switch to be considered closed by the
microprocessor. When the switch opens, the "+" input to the LM339 is above +5V, its output is high and the row is inactive.
3-2