Page 38 - WilliamsMidway WPC 91 Schematics 16-9289

Power Driver Board
The Power Driver Board provides+5V for al l of the cir cuitboards and +12Vfor the switches , The
Lamp , Solenoid ,and Ge neral Illumination ci rcu its are driv en from this board . The con trol for
these circu its is provided by the CPU Board.
Lamp Circuit
For all the lamps, the number on the left indicated the column, the numb er on the right ind icates
the row. Example -Lamp23 means 2nd column, 3rd row.
The lamps operate on +18V rectified and filtered DC and are operat ed in a ma trix configuration.
The processor controls both the co lumnand row circu its .
Lamp Matrix Yellow (B+) 1h .. Red
~
1 2 3 4 5 6 7 8
Vellow - Vellow- Vellow - Vellow · Vellow- Vellow . Veil ow- Vel low-
. Brown Red Oranae Black GrMn Blue ViolBt Gray
1 Red -
Brown
1 21 31 41 11 S1 71 '1
2 Red-Black
1 22 32 42 52 82 72 12
3 Red-
Orangtt
1 23 33 43 63 13 73 83.
4 Red-
V.rlow
1 24 :M 44 54 64 74 14
5 Red-
Gr.en
IJ 25 35 .s 55 &5 7S lIS
6 RMI-
Blue
" 2!i AA 411 .511 A 71 16
7 Red -Violet
1 27 37 47 57 17 n 87
8 Red -Gray ,1 211 :lR 1lI SJ 611 78 RR
3-8