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IBM ThinkPad A20m/p A21m/p A22m/p Hardware Maintenance Manual

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The IBM Mobile Systems ThinkPad Computer Hardware Maintenance Manual of October 2001 is IBM's service manual for the ThinkPad A20, A21 and A22, part number 23P0896, Second Edition (October 2001), 158 pages. The title page lists the ThinkPad A20m, A21m and A22m (MT 2628/2633), the A20p, A21p and A22p (MT 2629), and the ThinkPad Dock (MT 2631).

Contents

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Page numbers are the manual's own.

  • Introduction (pp. 1-18): strategy for replacing FRUs, error messages, diskette compatibility matrix, multilingual safety notices, safety information and the laser compliance statement.
  • General descriptions (pp. 23-38): read this first, related service information including the product recovery program, passwords (p. 27) and power management (p. 30); checkout guide (p. 33) with PC-Doctor and the power system checkout (p. 35).
  • ThinkPad A20m/p, A21m/p and A22m/p, from p. 39: product overview and specifications (p. 41), status indicators, FRU tests, Fn key combinations; symptom-to-FRU index (p. 49).
  • FRU replacement notices (p. 56): screw notices and retaining serial numbers.
  • Removing and replacing a FRU (pp. 59-111): numbered procedures from 1010 Battery pack (p. 60) to 3020 ThinkPad Dock top cover (p. 107).
  • Locations (p. 112) and parts list (p. 115, with the A series model matrix, LCD FRUs, keyboards and recovery CDs).
  • Notices (p. 150).

What this manual does not contain

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The manual works at FRU level. It has no schematics and no component values, and a system board is a single part number. The only capacitor it mentions is the "bulging capacitor" hazard in the safety inspection guide.

What it settles

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The power system checkout (pp. 35-38) gives these limits: AC adapter output +15.5 to +17.0 V dc at pin 1; battery pack +0 to +12.6 V dc between terminals 1 and 5, discharged if below +11.0 V dc, and 4 to 30 kΩ between terminals 4 and 5 if above it; backup battery +2.5 to +3.2 V dc on the red wire.

Download: IBM ThinkPad A20m A20p A21m A21p A22m A22p Hardware Maintenance Manual.pdf

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