Apple 5.25 Drive and UniDisk Technical Procedures

The Apple 5.25 Drive / UniDisk Technical Procedures are the section for the Apple 5.25 Drive and the 5.25-inch UniDisk in Apple's Apple Service Technical Procedures: Apple II Family, Volume Two (part number 072-0229, November 1991 build). The section has 33 pages; its contents page is dated October 1989 and its sections were revised between October 1986 and May 1991.

Contents

• Section 1, Basics (p. 1.2): product description and model comparison, connecting the drives
• Section 2, Take-Apart (pp. 2.2-2.13): interchangeable parts, case top and shield, cable, analog board, mechanical assembly, door, spring and bezel
• Section 3, Adjustments (pp. 3.2-3.3): DSPEED
• Section 4, Troubleshooting (pp. 4.2-4.3): using the flowchart, the flowchart
• Section 5, Preventive Maintenance (pp. 5.2-5.4): read/write head, head load button, motor drive belt
• Section 6, Illustrated Parts List (p. 6.3, rev. Jan 91): finished goods assembly

What it settles

• The Apple 5.25 Drive has the same mechanism as the UniDisk plus a security lock connector, and all procedures for the two are the same (p. 1.2).
• The mechanical assembly is shared with the DuoDisk; the doors and sub-bezels differ by colour and model (p. 2.2).
• The DSPEED adjustment hole is next to the right-hand front rubber foot (p. 3.2).

What this document does not contain

Module-level service only: no schematic and no component values for the analog card. The DSPEED procedure refers to the separate Multi-Product Diagnostics section of the same volume, which is not in this extract.

Pages that cite this document

• Apple 5.25 Drive: basics, take-apart, DSPEED, troubleshooting, preventive maintenance and parts.
• Apple Disk IIc: the flowchart, as the nearest Apple chart for the Disk IIc.

Download: Apple 5.25 Drive and UniDisk Technical Procedures.pdf