Basic HTML Version
White --
0-
Green
~~~~~--~--r-~2~~--~3---r---4~~~~5~~--~6---r~~7~-'--~---'
Green-
Red
J207-2
U20-17
Dedicated
Grounded
Switches
Flipper
Grounded
Switches
Orange-Brown (1)
J205-1
Nom •
•""""n
Vol Up
Lett Coin Chula D1
Left
Out
Lane
Slam
TIlt
11
Orange-Red
(2)
J205-2
Cenlar
Coin Chula
D2
Orange-Black
(3)
J205-3
Right Coin Chula D3
Orange-Yallow (4)
J205-4
4th Coin Chula D4
Orange-Green
J205-6
No"".
I
.""""n
Ser Cradlla
(5)
Orange-Blua
(6)
J205-7
Norm.
IT .. '
FlJ'1CtIon
Ftr!clon
VolDown Down D6
Orange-Vlolat
(7)
J205-8
Orang.Gray
(8)
J205-9
Nom.
I
Toot
FI.IlCIIorI
FUlctIon
BegIn Test Enter D8
J2XX
=
CPU Board; J9XX
=
Fliptronic II Board;
SWITCH MATRIX CIRCUIT
i----------------------------------------------------------;,-;v------------l
,
CPU BOARD
!
!
Column
Inactive
Active
Off
On
Playfield
Column (excrncle)
Green-XXX
White-XXX
Row
Row (example)
_______________________________________
J
Switch Open
Switch Closed
Off
On
L
_
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.
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