File:Ferranti Archives PRN-SIN-SCH-012 ZX Printer hand-drawn circuit diagram, 2 March 1982.pdf
Summary
[edit | edit source]A photograph of an A4 photocopy of a hand-lettered circuit diagram titled "ZX PRINTER ELECTRONICS (2 MAR 82)", showing the whole ZX Printer. The ribbon from the computer's edge connector is drawn with wire colours and contact numbers (for example WHITE 16A to RD, GREY 15A to IORQ, YELLOW 9B to A2, ORANGE 1B to +5V and TURQ 2B to the input of the "+10V nom" rail). IC1, the ULA (Ferranti type 1026), drives the motor through Tr6 ZTX451 from pin 17 and the stylus through Tr3 BC182 and Tr4 ZTX551 from pin 12, while Tr5, the other ZTX551, is the paper-detect stage feeding pin 4 (as Sinclair's ZX Printer servicing manual also describes); an LED D3 and phototransistor Tr9 feed pin 2 through C10 10n, the FEED button S1 is on pin 15, and pin 3 has an RC network (R13 100K, C8 4n7). A converter built round Tr1 BC214, Tr2 ZTX651 and a small transformer, with D1 and C4 100u 63V, makes the +50V stylus supply from the "+10V nom" rail. The pin numbers agree with the ULA logic diagram PRN-FER-SCH-106 and the pad-circuit drawing PRN-FER-SCH-010. The sheet carries no company name or drawing number; the catalogue's origin "Sinclair/Ferranti" is an attribution. Part of the Ferranti Archives 2026.
Archive record
[edit | edit source]| Catalogue ID | PRN-SIN-SCH-012 |
|---|---|
| Date | 2 March 1982 |
| Origin | Sinclair/Ferranti (catalogue attribution; the sheet carries no company name) |
| Document type | Schematic/Logic Diagram |
| Device or subject | ZX Printer |
| Catalogue description | Hand-drawn ZX Printer hardware schematic |
| Original file name | {{{filename|}}}
|
| Found in | ZX81-FER-FOL-013 |
| Pages | 1 |
Source
[edit | edit source]Ferranti Archives 2026, original scan on Google Drive.
Author
[edit | edit source]Unknown. The sheet carries no company name; it was kept in Ferranti's files.
Licence
[edit | edit source]Ferranti Archives 2026: source and terms of use
This scan is part of the Ferranti Archives 2026, a collection of Sinclair-related documents from Ferranti's files, catalogued in 2026 and released through the Happy Little Diodes YouTube channel (video, catalogue). The archive presents the documents for preserving and archiving material of historical interest, and for non-commercial, educational and archival research. Its terms state that consent is strictly limited to non-commercial use, and that any commercial exploitation of the documents or their contents, including use in connection with the manufacture, marketing or sale of goods, is strictly prohibited by Sky UK Limited.
Copyright remains with the rights holders. The file is not freely licensed and is hosted here for preservation and repair reference only, under the archive's terms. Personal information was redacted by the archive before release; if you find any that remains, please tell [email protected].
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| current | 23:12, 16 October 2026 | 0 × 0 (1.4 MB) | Josh (talk | contribs) | Ferranti Archives 2026: PRN-SIN-SCH-012 |
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