File:Macintosh analog board crowbar circuit (Macintosh Repair and Upgrade Secrets Fig 6-7).png
Summary
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Partial schematic of the +12 V output and crowbar circuit of the 128K to Macintosh Plus analog board: transformer T3, rectifier CR21, L8, C31, C25, zener CR18, R32, R33, the crowbar SCR Q8 and connector J4. Figure 6-7 of the book.
Source
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Larry Pina, Macintosh Repair & Upgrade Secrets (Hayden Books, 1990), chapter 6, p. 120, Figure 6-7. Cropped from the scan hosted on this wiki as File:Macintosh Repair & Upgrade Secrets.pdf (see Macintosh Repair & Upgrade Secrets).
Author
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Larry Pina
Licence
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Copyright © 1990 Larry Pina; published by Hayden Books (Howard W. Sams & Company). Not freely licensed. Reproduced from the copy of the book hosted on this wiki for repair reference, with the source cited.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 09:13, 25 October 2026 | | 1,154 × 460 (135 KB) | Josh (talk | contribs) | Upload figure for repair guide |
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