Xerox OLYMPIA ELECTRONIC COMPACT - 3.05 Control circuit board

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r

L

3

.os·

Contra

l

circuit

board

(Circuit

Diagram

F)

I

The

IC

components

of the control

circuit

board

are:

IC

1 -

Keyboard

buffer

IC

2 -

EPROM

(programme

memory)

2716

D

IC

3 -

Address

latch (octale 3-state D-latch)

IC

4 -

CPU

IC

5 - 4 to

10

decoder

IC

6 -

1/0

expander

IC

7 -

NOR

Gate

4001

BC

for

CPU

reset

and

delay-1

NOR

Gates

for

shift

control

(flip

flop)-2

IC

8 -

NANO

Gate

for buzzer

IC

9

IC

10

- Inverter for driver

circuit

activation

IC

11

TRA1

- Transistor

Array

L004C

The

control

circuit

board

includes the drivers for the

motors

and

the

hammer

solenoid beside the control

components

(See

G).

8

The

plug

arrangement is:

Cone

1

Keyboard

output

Ze

2

Keyboard

input

Sp

3 Horizontal

motor

(printer)

4 Vertical

motor

(index)

5 Printer

PCB

6

Power

pack

7

Paper

injector switch

2

l

4-+-0

Fig-3

D

t--6

Dr-3

..-----,

0-t-

7

5

_I