Sinclair QL Service Manual


The QL Service Manual was OCR'ed by Andy Dansby for the Sinclair world. Many thanks to Clive Sinclair for the concept of such a wonderful machine.

The QL Service Manual was HTML'ed by Juanjo Ruiz Leo. Resurrected for the QL World in summer 2013 by Urs König. QL forever!

Foreword by Urs König: This Service Manual relates a bit too closely to Issue 5 and Issue 6 QL PCBs and does not cover JS and later ROMs, nor chipset variations, nor the SAMSUNG made QLs. Follow the link to a web page with details about all machine build standards.


Prepared by THORN (EMI) DATATECH LTD for SINCLAIR RESEARCH LTD
OCTOBER 1985
© Sinclair Research Ltd.
SERVICE MANUAL X-1204

List of Contents

List of Illustrations

History Sheet

MANUAL ISSUETEXTCIRCUIT/LAYOUT DIAGRAMSREMARKS
1JANUARY 1985
2JUNE 1985
Minor changes made to pages 1.5, 3.6, 4.1, 4.3, 4.4, 4.15, 4.17 and 5.7.
3OCTOBER 1985
Appendices A, B, C and D added to Section 4.

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System Description