Apple DuoDisk Technical Procedures
The DuoDisk Technical Procedures are the Apple DuoDisk section of Apple's Apple Service Technical Procedures: Apple II/Apple III Archived Products, Volume One (part number 072-0231). The section has 38 pages; its contents page is dated March 1988 and its sections were revised between February 1987 and June 1989. Apple numbers pages by section (4.5 is the fifth page of section 4).[1]
Contents
[edit | edit source]- Section 1, Basics (p. 1.2): product description, model comparison, connecting the drives
- Section 2, Take-Apart (pp. 2.2-2.9): interchangeable parts and sub-bezels, cover and shields, analog board, mechanical assembly, sub-bezel and door
- Section 3, Adjustments (pp. 3.2-3.3): DSPEED
- Section 4, Troubleshooting (pp. 4.2-4.6): flowchart, analog card version identification, the DuoDisk capacitor fix, analog card chip-swapping chart
- Section 5, Preventive Maintenance (pp. 5.2-5.4): read/write head, head load button, motor drive belt
- Section 6, Additional Procedures (p. 6.2): special repair procedure for loose analog boards
- Illustrated Parts List (IPL.3-IPL.7): external parts, internal parts, analog card
What it settles
[edit | edit source]- The three analog card versions (676-[ ]101, 102 and 107), and the removal of C29 and C30 from 101 and 102 cards to stop data damage on Open Apple-Control-Reset and with some copy-protected software (pp. 4.4-4.6).
- Fuzz on an analog card usually means C21 exploded because the computer was on while the card was installed (p. 4.5).
- DuoDisks with serial numbers below 325000 can have loose analog boards; the shield is bent in about 1 mm to hold them (p. 6.2).
- The mechanical assembly 661-72128 is shared with the Apple 5.25 Drive and UniDisk, with a different sub-bezel (p. 2.2, IPL.5).
What this document does not contain
[edit | edit source]Module-level service only: no schematic of the analog card or the controller card, and no component values. The 1985 edition of the troubleshooting section, with a longer chip chart, is bound in the binder described at Service Support Training Programs LaserWriter Technical Procedures Jan 1985 and summarised on the Disk II page.
Pages that cite this document
[edit | edit source]- Apple DuoDisk: basics, take-apart, DSPEED, troubleshooting, capacitor fix, chip chart, loose boards and parts.
Download: Apple DuoDisk Technical Procedures.pdf
References
[edit | edit source]- ↑ Apple Computer, DuoDisk Technical Procedures, hosted as File:Apple DuoDisk Technical Procedures.pdf, extracted from PDF pages 303 to 340 of the archive.org scan https://archive.org/details/astpv1.