Acorn BBC Master Series Manuale utente
BBC Master
128
SERVICE MANUAL
© 1985 Acorn
British Broadcasting Corporation
Master Series Microcomputer
Service Manual
British Broadcasting Corporation
Master Series Microcomputer
Service Manual
Part No 0443,004
Issue 1
April 1986
Master Series Service Manual
Within this publication the term 'BBC' is used as an abbreviation for
'
British Broadcasting Corporation'.
Copyright Acorn Computers Limited 1986
Neither the whole or any part of the information contained in, or the
product described in, this manual may be adapted or reproduced in any
material form except with the prior written approval of Acorn
Computers Limited (Acorn Computers).
The product described in this manual and products for use with it, are
subject to continuous development and improvement. All information of
a technical nature and particulars of the product and its use (
including the information and particulars in this manual) are given by
Acorn Computers in good faith. However, it is acknowledged that there
may be errors or omissions in this manual. A list of details of any
amendments or revisions to this manual can be obtained upon request
from Acorn Computers Technical Enquiries. Acorn Computers welcome
comments and suggestions relating to the product and this manual.
All correspondence should be addressed to:-
Technical Enquiries
Acorn Computers Limited
Newmarket Road
Cambridge
CB5 8PD
All maintenance and service on the product must be carried out by
Acorn Computers' authorised dealers. Acorn Computers can accept no
liability
whatsoever for any loss or damage caused by service or
maintenance by
unauthorised personnel. This manual is intended only to
assist the reader in the use of this product, and therefore Acorn
Computers shall not be liable for any loss or damage whatsoever
arising from the use of any information or particulars in, or any
error or omission in, this manual, or any incorrect use of the
product.
This manual is for the sole use of Acorn Computers' authorised dealers
and must only be used by them in connection with the product described
within.
First published 1986
Published by Acorn Computers Limited
1
Issue 1
Master Series Service Manual
WARNING: THE COMPUTER MUST BE EARTHED
IMPORTANT: The wires in the mains lead for the apparatus are coloured in
accordance with the following code:
Green & Yellow Earth
Blue Neutral
Brown Live
The moulded plug must be used with the fuse and fuse carrier firmly in place.
The fuse carrier is of the same basic colour (though not necessarily the same
shade of that colour) as the coloured insert in the base of the plug.
Different manufacturers' plugs and fuse carriers are not interchangeable. In
the event of loss of the fuse carrier, the moulded plug MUST NOT be used.
Either replace the moulded plug with another conventional plug wired as
detailed below, or obtain a replacement fuse carrier from an authorised Acorn
dealer. In the event of the fuse blowing it should be replaced, after
clearing any faults, with a 3 amp fuse that is ASTA approved to BS1362.
If the socket outlet available is not suitable for the plug supplied, the
plug should be cut off and the appropriate plug fitted and wired as
previously noted. The moulded plug which was cut off must be disposed of as
it would be a potential shock hazard if it were to be plugged in with the cut
off end of the mains cord exposed.
As the colours of the wires may not correspond with the coloured markings
identifying the terminals in your plug, proceed as follows:
The wire which is coloured green and yellow must be connected to the terminal
in the plug which is marked by the letter E, or by the safety earth symbol -
I-, or coloured either green or green and yellow.
The wire which is coloured blue must be connected to the terminal which is
marked with the letter N, or coloured black.
The wire which is coloured brown must be connected to the terminal which is
marked with the letter L, or coloured red.
2 Issue 1
Master Series Service Manual
BBC Master Series Microcomputer Service Manual
Contents
1 - Introduction
2 - Packaging and installation
3 - Disassembly and assembly
4 - Selection links
5 - Hardware description
5.1 Introduction
5.2 Core machine
5.3 Internal I/O
5.4 External I/O
6 - Test equipment
7 - Fault finding
7.1 Switch on
7.2 Sideways RAM
7.3 Video
7.4 Real time clock
7.5 Analogue port
7.6 RS423 port
7.7 Cassette interface
7.8 Disc drive interface
7.9 Parallel printer port
7.10 User port
7.11 1MHz bus
7.12 The Tube
7.13 Internal co-processor
7.14 Sound output
7.15 Modem connector
7.16 Cartridge port
7.17 Econet
Appendix
Connector pinouts
Parts list
Component locations
PCB circuit diagram
Final assembly
EPROM cartridge circuit diagram
Econet module circuit diagram
Keyboard circuit diagram
3 Issue 1
Master Series Service Manual
1 Introduction
This manual is intended to provide the information required to
diagnose and repair faults on the BBC Master Series Microcomputer
which was designed by Acorn Computers Ltd of Cambridge, England.
The information contained in this manual is aimed at service engineers
and Acorn dealers who will be servicing the BBC Master Series
Microcomputer on behalf of Acorn Computers Ltd.
4
Issue 1
Master Series Service Manual
2 Packaging and installation
The microcomputer is supplied with three-part moulded polystyrene
packing in a cardboard box. Supplied with the microcomputer is a
Welcome Guide, an aerial lead, a welcome tape, a welcome disc, two
reversible keyboard inserts, a VIEW reference card, a ViewSheet
reference card, and a guarantee card.
The mains supply for UK models is 240V AC 50Hz. The microcomputer is
supplied with a moulded 13 amp square pin plug. If this plug is
unsuitable then it must be cut off and thrown away. Instructions for
fitting a replacement plug are given right at the front of this
manual.
The microcomputer is turned on by a switch at the back of the
microcomputer
next to the mains lead.
Do not use the microcomputer in conditions of extreme heat, cold,
humidity or dust or in places subject to vibration. Do not block
ventilation under or behind the computer. Ensure that no foreign
objects are inserted through any openings in the microcomputer
.
5
Issue 1
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