1990-1991 Apple Desktop Bus Mouse

Applies to Apple Desktop Bus Mouse that shipped with the following Macs:

  • Macintosh Classic
  • Macintosh LC
  • Macintosh IIsi

Between September 1990 and January 1991

Component affected:

  • Apple Desktop Bus Low Power Mouse that meet the following criteria:
    – Reads “made in the USA”
    – An 11-digit serial number ranging from AP038xxxxxx through AP103xxxxxx (inclusive)

Symptoms:

  • Complete loss of horizontal and/or vertical cursor movement.

Apple Repair program:
Apple released a document as part of it’s Service Source in 1991 detailing the issue and steps to replace the mouse. Free mouse replacements were offered through June 15, 1993.

The Issue:
A certain design of this mouse was susceptible to electrostatic discharge (ESD) damage and failure. This mouse did not have adequate shielding for safely discharging static electricity, which causes the charge to hit the control board and disable the Application Specific Integrated Circuit (ASIC) controller. While there was no electrical shock hazard to customers and no potential damage to the system the mouse was connected to, it could destroy the mouse itself.

The Fix:
At the time, returning the damaged mouse to Apple or service providers would get you a new one.

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