ACT apricot - Disk Drives; General; Power Supply Details

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SYSTEM

UNIT

A description of

the

System

Board

and

all

the

major

circuit

elements

on

the

board

listed

above are detailed

in

I

subsequent

chapters.

DISK DRIVES

One

or

two

disk

drives

can

be fitted inside

the

System

Unit.

In

a single drive system,

the

disk

drive is fitted

on

the

left

hand

side

(as

viewed from tile front). Single drive

systems

can

be upgraded

into

a

dual

drive

system

by adding

a second disk drive

without

any

modification to

the

hardware.

The

disk

drives are

mounted

on

a

metal

chassis assembly

above

the

System

Board,

and

secured

in

place by

two

pairs of

screws

in

each

of

the

chassis side plates.

The

disk eject

button

and

the

activity

indicator

of

the

disk drive fit

through

the

front facia of

the

System

Unit.

The

function

of

the

disk

eject

button

is self-explanatory.

The

activity

indicator

is

illuminated

when

disk

read

and

write

operations are

in

progress,

and

also

momentarily

when

the

disk is first

inserted

into

the

drive.

A ribbon cable assembly

connects

the

disk drive to

the

disk interface

on

the

System

Board. Regulated power

supplies are supplied to

the

drive

from

the

System

Board, via

a 4-way cable assembly.

The

standard

disk drives

use

70-track single sided

MicroFloppy disks

with

a

total

storage capacity of 315

kbytes of

formatted

data. A detailed description of these

disks

and

further

details of

the

disk

drives

can

be found

in

the

Disk

Drive

section.

POWER SUPPLY DETAILS

General

The

mains

input

into

the

System

Unit

is filtered

(by

a

line

filter

mounted

on

the

rear panel),

and

then

routed

via

the

input

fuse

and

the

mains

switch.

Switching

the

System

Unit

on

supplies

the

mains

voltage

to

the

power supply

unit

(PSU)

and

operates

the

mains

powered cooling fan.

Table of Contents

Other manuals for ACT apricot

Service Manual305 pages