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Amstrad PPC 512 / PPC 640 Service Manual

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Revision as of 23:18, 24 September 2026 by Josh (talk | contribs) (Real documentation page: contents with page numbers, the full technical specification (10 alkaline C cells for up to 8 hours, 640x200 supertwist LCD, integral V21/V22/V22bis/V23 modem), and the three things that matter for repair - a PSU schematic, a separately documented fuse PCB, and a battery PCB drawn apart from the CPU board. Recorded that the 'Compendium' page holds the same document)
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The PPC 512S / 512D, PPC 640S / 640D Personal Portable Computer Service Manual is Amstrad's own service manual for the PPC portables. 31 printed pages, scanned as 42, with a text layer and searchable.

Contents

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Amstrad's own contents list, with printed page numbers:

  • Technical specification — 2; important notes to service engineers — 2
  • FD-5 maintenance and alignment information — 3–11
  • Exploded view 1 — 12; exploded view 2 — 13
  • Circuit board views — 14; alignment instructions — 14
  • FD-5 control board schematic diagram — 15
  • Cabinet drawing and parts list — 16
  • CPU / switch / battery PCBs; memory / fuse / volume PCBs — 18, 19
  • Modem PCB component layout — 20
  • Keyboard schematic diagram — 21
  • Chassis schematic diagrams — 22–25
  • Power supply schematic diagram — 26
  • Modem chassis schematic diagrams — 27, 28
  • Electrical parts list — 29–31

What it settles

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Technical specification for the PPC640:

  • 8086 16-bit processor at 8 MHz; 640K RAM and 64K video memory
  • A compartment for 10 alkaline C cells giving up to 8 hours use, plus an AC mains adaptor
  • Integrated display adaptor fully MDA- and CGA-compatible, driving either the internal LCD panel or an external monitor
  • 640 × 200 pixel supertwist LCD, supporting all CGA and MDA graphics and text modes, tiltable to six viewing angles with adjustable contrast; grey-scale emulation
  • Integral modem supporting V21 (300 bps full duplex), V23 (1200/75 bps), V22 (1200 bps full duplex) and V22bis (2400 bps full duplex), Hayes-command compatible with auto-dialling and auto-answer; serial port included
  • Enhanced AT-type keyboard with 102 keys; single or twin 720K 3.5-inch drives; MS-DOS 3.3; Mirror II communications software
  • Speaker with volume control; battery-backed real-time clock with scratchpad RAM; 8087 socket; socket for the PPC640 expansion box, which accepts IBM-compatible expansion cards and a hard disc; carrying case with pockets for manual and disks

Three things here matter for repair. The machine has its own power supply schematic (page 26) and a separate fuse PCB documented at page 18–19 — so a dead PPC has a documented fuse to check before anything else. The battery PCB is drawn separately from the CPU board, which is where corrosion from ten leaked C cells does its damage. And the modem is a separate subsystem with its own component layout and its own chassis schematics, so a modem fault need not implicate the mainboard.

The FD-5 maintenance and alignment section at pages 3–11 is a full drive procedure in the same style as the FD-3 sections of the PC1512 and PC1640 manuals.

What this manual does not contain

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  • No LCD panel repair data — the display is treated as an assembly.
  • No expansion box coverage.
  • No fault-symptom table for the computer itself; the flowcharts cover the drive.

Another copy of this document

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Amstrad PC and PPC Service Manual (Compendium) holds the same manual in a 32-page scan, under a title that wrongly implies it also covers the PC1512 and PC1640. It does not.

Download here: Amstrad PPC 512 PPC 640 Service Manual.pdf

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