Apple Hard Disk 20 Service Source: Difference between revisions
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The '''Hard Disk 20''' volume of Apple's ''Service Source'' is a '''19-page''' take-apart document for the Apple Hard Disk 20, the 20 MB drive that connects to the Macintosh external floppy port over Apple's Directly Connected Disk protocol rather than SCSI. The PDF was distilled on 5 December 1995. | |||
== Contents == | |||
* '''Take Apart''' (pdf pp. 3-17) - Cover, Controller Board, Bottom Shield, Fan, Power Supply, Hard Drive. The order matters: each step assumes the one before it. | |||
* '''Exploded View''' (pdf pp. 18-19). | |||
Apple's cover procedure warns against using a screwdriver to separate the case halves; the plastic is brittle and the tabs break. | |||
== What this manual does not contain == | |||
There is '''no Basics, Specifications, Troubleshooting or Adjustments chapter'''. The manual prints no capacity or transfer figures, no supply voltages, no symptom chart, no parts list, no schematic and no component values. It also does not describe the DCD interface at all - for that, see the [[Apple Directly Connected Disks Specification]], which is hosted here and does give the DB-19 pinout, the 489.58 kbit/s line rate and the fact that the drive is self-powered. | |||
== Pages that cite this document == | |||
* [[Apple Hard Disk 20 Maintenance]] - the disassembly order and Apple's cautions. | |||
* [[Apple Directly Connected Disks Specification]] | |||
<pdf> File:Hard disk 20.pdf </pdf> | <pdf> File:Hard disk 20.pdf </pdf> | ||
Download | Download: [[:File:Hard disk 20.pdf|Hard disk 20.pdf]] | ||
[[Category:Service Manuals]] | [[Category:Service Manuals]] | ||
[[Category:Apple Vintage Computers]] | [[Category:Apple Vintage Computers]] | ||
[[Category:Apple Service Source]] | [[Category:Apple Service Source]] | ||
Revision as of 07:31, 25 September 2026
The Hard Disk 20 volume of Apple's Service Source is a 19-page take-apart document for the Apple Hard Disk 20, the 20 MB drive that connects to the Macintosh external floppy port over Apple's Directly Connected Disk protocol rather than SCSI. The PDF was distilled on 5 December 1995.
Contents
- Take Apart (pdf pp. 3-17) - Cover, Controller Board, Bottom Shield, Fan, Power Supply, Hard Drive. The order matters: each step assumes the one before it.
- Exploded View (pdf pp. 18-19).
Apple's cover procedure warns against using a screwdriver to separate the case halves; the plastic is brittle and the tabs break.
What this manual does not contain
There is no Basics, Specifications, Troubleshooting or Adjustments chapter. The manual prints no capacity or transfer figures, no supply voltages, no symptom chart, no parts list, no schematic and no component values. It also does not describe the DCD interface at all - for that, see the Apple Directly Connected Disks Specification, which is hosted here and does give the DB-19 pinout, the 489.58 kbit/s line rate and the fact that the drive is self-powered.
Pages that cite this document
- Apple Hard Disk 20 Maintenance - the disassembly order and Apple's cautions.
- Apple Directly Connected Disks Specification
Download: Hard disk 20.pdf