This 4th-edition service manual for the BBC Micro was published in July 1984, building on the 1982 first edition.

From the introduction:

'The purpose of this manual is to provide technical and diagnostic information about the BBC Microcomputer. 

After giving general information about the technical specification and the mechanical assembly of the BBC Microcomputer, it gives a detailed description of the operation of the whole of the circuit.  Information is also given about how to upgrade the various models of microcomputer and the purpose of the various links on the circuit board.  Some details are also given of the ways in which the circuit has changed in its evolution from issue 1 up to issue 7.  There is some guidance about servicing and fault-finding, further information about interfacing and a few suggestions about possible applications.  Finally there is a section of hardware hints and tips which is a compilation of ideas from various sources.'

Reference Number : 0403,002

Date Published : July 1984

Manufacturer : Acorn Computer

Platform : BBC Micro

Format : A4 Spiral Bound: 86 Pages