Williams Electronics WHIRLWIND - Special and Controlled Solenoids; Figure 4. Typical Solenoid A;C Select Relay Circuit

Williams Electronics WHIRLWIND

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TEST/DIAGNOSTIC

PROCEDURES

(Continued)

"On"

State

Logic

-

Special

Solenoid

"On"

State

Logic

-

Controlled

solenoid

S

I.

B

From

7407

+25v°

+

PIA

Spl

Sol.

Trigger1J18

Lo

_m

C

t

Id

W»

W‘

4401

n

r

_

ﬂippers

enabled

S

gglﬁfld

"Off"

State

-

Special

Solenoid:

The

Special

Switch

Trigger

input

goes

low.

Mean-

while,

the

PIA

line

remains

high.

The

remaining

sig-

nals

reverse

their

states.

"Off"

State

-

Controlled

Solenoid:

of

the

signals

reverse

their

states.

NOTE

As

directed

by

the

game

program,

the

Solenoid

A/C

Select

Relay

(solenoid

12)

switches

the

solenoid

B+

power

between

two

power

busses

to

permit

actuating

two

groups

of

solenoids

at

the

proper

times.

in

its

d_e_-_en_e1gjze_d

state,

the

Relay

connects

the

‘circuit

A

power‘

to

16

"controlled"

and

"switched"

solenoids

(identified

in

the

table

with

no

suffix

letter

or

the

letter

A,

after

the

solenoid

number).

individual

solenoid

operation

than

depends

on

the

game

program

enabling

the

ground

path

for

solenoid

actuation

via

the

driver

transistor

associated

with

each

solenoid

circuit.

For

example,

the

game

program

can

actuate

the

Outhole

Kicker

solenoid

(sol.

01

A),

via

the

driver

transistor

033.

When

the

game

program

determines

that

the

Solenoid

A/C

Select

Relay

(sol.

12)

must

be

energized,

the

relay

connects

‘circuit

C

power’

to

eight

group

C

solenoids

(010

through

08C).

Now,

driver

transistor

Q33

can

actuate

the

Bottom

Right

Flasher

circuit

(sol.

010),

which

has

two

lamp

circuits,

one

to

the

insert

Board

and

one

to

the

playfield.

Using

this

“multiplexing”

technique,

the

same

driver

transistor

can

control

actuation

of

two

separate

(A

side

and

C

side)

solenoid

circuits.

part

of

Aux

Pwr

Driver

Bd

D-1

2247

7

part

of

Master

interconnect

Bd

CPU

Board

D-12313-574

D-11883

1J11-1

System

1-1-B-‘"1

I

i

<7

#906

Buib(

>

Fl

F20

5.111-1_

5A,S-B

B

F2A

5.111-5

‘$5.14-9

2.5A,

S-B

,7

Vi

Brn

Sol.

01A

Outhole

Kicker

Orn

J‘)

D23

Figure

4.

Typical

Solenoid

A/C

Select

Relay

Circuit,

showing

the

The

Enable

input

(from

the

PIA)

goes

low.

Mean-

while,

the

BLANKING

signal

remains

high.

The

rest

Sol.

01C

ED

Bottom

Rig

ht

asher

function

of

Solenoid

12,

the

Solenoid

A/C

Select

Relay.

Wlfnlili‘[iWiilmC<il

S3

3

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