Basic HTML Version
SWITCH MATRIX
WHITE~
o-GREEN
D1
7 8
Org-Bm
J205-1
Left Coin
Chute
White-Brown
J2D9-1
U18-11
1
LOWER
LEFT
10
POINT11
Green-
Violet
J207-7
U20-12
Green-
Gray
J207-S
U20-11
Flipper
Dedicoted
Grounded
Switches
White-Orange
J20S-3
U18-5
3
NOT
USED
71
Org-Red
J205-2
Center Coin
Chute D2
Org-Blk
J205-3
Right Coin
Chute D3
Org-Yel
J205-4
4th Coin
Chute
White-Red
J20S-2
U18-9
2
UPPER
LEFT
10
POINT12
D5
White-Yellow
J20S-4
U18-7
4
PLUMB
BOB
TILT
White-Green
J20S-5
U1S-11
5
RIGHT
SLINGSHOT
64
NOT
USED
74
Org-Blu
J205-7
Normal T.st
Volume Down
Down
06
Org-Vio
J205-8
Normal T_t
VoIUrl'lll
Up
Up
D7
White-Blue
J20S-7
U1S-S
6
White-Violet
J20S-8
U1S-5
7
Org-Gry
J205-S
•.....•
,
BltcJin
Tnt
Tnt
En ••••
D8
J2XX
=
CPU BOARD; J9XX = F"LIPTRONICII BOARD
W@m;q
=
OPTO. TYPICALLY CLOSED
SWITCH MATRIX CIRCUIT
ROW
OFF
ON
OFF
ON
White-XXX
SWITCH OPEN
SWITCH CLOSED
The microprocessor is constantly strobing the column side of the switch. When point
"Aft
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,
therefore, its output is 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