CONTENTS

Technical Specification
Important Notes to Service Engineers
FD-5 Maintenance and Alignment Information
Exploded View 1
Exploded View 2
Circuit Board Views
Alignment Instructions
FD-5 Control Board Schematic Diagram
Cabinet Drawing & Parts List
CPU/Switch/Battery P.C.B.'s
Memory/Fuse/Volume P.C.B.'s
Modem P.C.B. Component Layout
Keyboard Schematic Diagram
Chassis Schematic Diagrams
Power Supply Schematic Diagram
Modem Chassis Schematic Diagrams
Electrical Parts List

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TECHNICAL SPECIFICATION
PPC640
  • Parallel Centronics Printer Port
  • Compartment for 10 Alkaline C Cells to give up to 8 hours use.
  • 8086 16-bit processor, 8MHz clock.
  • 640k Ram, 64k Video Memory.
  • Integrated display adaptor fully compatible with MDA and CGA.
    Drive either the LCD panel or an external monitor.
  • 640 x 200 pixel supertwist LCD panel supports all CGA and
    MDA graphics and text modes. Display can be tilted to 6
    viewing angles and contrast is fully adjustable to allow for
    different lighting conditions.
  • Integral Modem which supports
    V21 (300 bps) Full Duplex
    V23(1200/75bps)
    V22 (1200 bps) Full Duplex
    V22bis (2400 bps) Full Duplex
  • Hayes Command compatible; auto-dialling, auto answer
  • Includes Serial Port.
  • AC Mains Adaptor.
  • Enhanced AT type keyboard with 102 keys.
  • Single or Twin 720K 3'/2 inch Disk Drives.
  • Microsoft MS-DOS 3.3 Operating System
  • Mirror II Communications Software.
  • Built-in Super Twist, 640 x 200 resolution, with grey scale
    emulation; hardware to drive any external CGA monitor.
  • Speaker with volume control.
  • Battery backed real time clock with scratchpad RAM.
  • Socket for 8087 maths co-processor.
  • Socket for PPC640 expansion box (to accept IBM compatible
    expansion cards and hard disk).
  • Carrying case with pockets for manual and disks.
  • Carrying size closed:
    Length: 450mm (17 3/4") excluding handle.
    Depth: 230mm (9")
    Height: 100mm (4")
    Weight: 5.4Kg (11 3/4lb) excluding batteries.

PPC512

  • PPC512 specification as PPC640 but with 512K Ram and
    without integral modem and Mirror II Communications Software.
  • Single or Twin 720K 3'/2 inch Disk Drives.


IMPORTANT NOTES TO SERVICE ENGINEERS


This Service Manual gives indepth technical information on all of the circuits and the P.C.B.'s which make up the PPC512/640. Much of this data Is for information purposes only as the procedure engineers will follow when servicing this equipment will often be to exchange Printed Circuit Boards. In some instances Amstrad will insist that subassemblies are returned for exchange and should not be serviced by Service Engineers.
Please take note of the following information before attempting to the service the equipment.

  1. Full diagnostics are not specified in this manual. A diagnostic tool, designated the R.P.5-2*, is available from CPC and gives certain diagnostic information on the Computer. To carry out any indepth fault-finding this diagnostic tool is necessary.

  2. The Disc Drive Mechanism and accompanying Printed Circuit Boards should not be serviced by Service Engineers. Exchange mechanisms complete with P.C.B.'s are available from Amstrad.

  3. LCD Supertwist is a complete unit, and no service should be attempted on this unit by the field engineers. Exchange Display Assembly should be obtained from Service Department.

  4. Complete Printed Circuit Boards are available on an exchange basis and unless the Service Engineer is particularly familiar with this product arrangements should be made to exchange the P.C.B.'s where a fault has developed. The R.P.5-2 diagnostic referred to above can be used to ensure correct diagnosis of the P.C.B. fault.

  5. In some instances a second Disc Drive will be fitted to the PPC512/640. This second Disc Drive is subject to seperate service information but under no circumstances should any service work be carried out on the mechanism or its Printed Circuit Board. In the event of a fault on the second Disc Drive arrangements should be made to exchange this.

  6. Service Engineers carrying out any repairs on this unit can contact the Customer Services Section of Amstrad for further information should they have any difficulty.

The PPC512/640 is a sophisticated piece of computer technology and service work should be undertaken on this equipment by
suitably qualified personnel and preferably by appointed Amstrad Agents.
*Upgrade kit is available to enable full diagnosis of the said machine.

 

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