File:Ferranti Archives TV-FER-SCH-165 detail, ZN401 test box sequencer timing chain and reset relay.png
Summary
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Upper part of Ferranti's ink schematic "Sinclair TV Test Box, Sequencer Logic", dated 12 October 1983: the front-panel button latch (74L00 and 74L10), the chain of 74121 monostables giving pulse A (1.5 ms), B (about 200 ms) and the 1.5 ms STROBE C, with the waveform sketch and component values (C3 = C5 = 470 nF, R3 = R5 = 4K7, C4 = 22 µF, R4 = 15K, R6 = 4K7, C6 = 470 nF), and the "reset and sync" button with the 5 V relay, "on sep board", that joins pins 21 and 22 of the device under test. The 74163 counter, 74154 decoder and 7447 display driver are on the lower part of the sheet, not included here.
Detail rendered from File:Ferranti Archives TV-FER-SCH-165 Sinclair TV test box sequencer logic, 12 October 1983.pdf. Used on Ferranti ZN401 Test Box.
Licence
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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].
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:37, 18 October 2026 | | 2,191 × 1,013 (1.61 MB) | Josh (talk | contribs) | Detail rendered from a Ferranti Archives 2026 scan |
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