Amstrad ALT-286 / ALT-386SX Service Manual
The ALT286 / ALT386SX Laptop Computer V.FTZ Service Manual is Amstrad plc's service manual for its two laptops, the Amstrad ALT-286 and Amstrad ALT-386SX. The hosted scan has 38 pages and no text layer; the printed pages run to 26, and the large schematics are split across several scan pages. No part number, price or issue date is printed.
Contents
[edit | edit source]Amstrad's contents list, with printed page numbers:
| Section | Page |
|---|---|
| Technical specifications; safety tests | 2 |
| ALT286/386SX LCD inverter PCB | 3 |
| ALT286/386SX keyboard PCB | 4 |
| ALT286/386SX expansion slot PCB | 5 |
| ALT286 co-processor PCB, top and bottom views | 6–7 |
| ALT286/386SX VGA PCB, top and bottom views | 8–9 |
| ALT286/386SX electrical parts list | 10–11 |
| Cabinet parts list | 12 |
| Cabinet exploded view | 13 |
| ALT286 main PCB, top and bottom views | 14–15 |
| ALT386SX main PCB, top and bottom views | 16–17 |
| ALT286 main PCB schematic diagrams (1) and (2) | 19–20 |
| ALT286 co-processor/memory schematic diagram | 21 |
| ALT286/386SX VGA schematic diagram | 22 |
| ALT286/386SX peripheral schematic diagram | 23 |
| ALT386SX main PCB schematic diagrams (1) and (2) | 24–25 |
| ALT386SX co-processor/memory schematic diagram | 26 |
What it covers
[edit | edit source]The specification on page 2 compares the two models side by side: an 80286 or 80386SX at 16 MHz switchable to 8 MHz; 1 wait state on the ALT286 and 0.6 on the ALT386SX, or none with 60 ns DRAM; 1 MB of RAM with 2 MB and 4 MB upgrades; one half-length 16-bit slot; a 20 MB (28 ms) or 40 MB (25 ms) voice-coil hard disk; a 1.44 MB 3.5-inch floppy drive; VGA, EGA, CGA, MDA and Hercules graphics on a backlit 640 × 480 LCD of 223 × 169 mm with 32 grey scales; an internal 110/220/240 V self-switching power supply; a removable NiCd battery pack giving two hours, with a two-hour quick charge; 318 × 380 × 95 mm; and 7.00 kg with the battery, 6.00 kg without. The same page gives the safety tests: a 1.5 kV RMS flash test for 3 seconds, an insulation test at the same voltage requiring more than 4 MΩ, and a mains-lead earth resistance of no more than 0.5 Ω.
The electrical parts list on page 10 gives the PCBs, ICs (including the VLSI VL82C-series chip set, the Cirrus Logic CL-GD610 and CL-GD620 VGA controllers, the MC146818AF real-time clock and the BIOS EPROMs), switches, diodes, transistors, coils, crystals and miscellaneous parts; page 11 lists the parts that differ on the ALT386SX. The cabinet parts list on page 12 gives the mechanical parts and the replaceable units: the NiCd battery pack, keyboard unit, LCD unit, hard disk, floppy disk unit, power supply unit and fan motor.
What this manual does not contain
[edit | edit source]- No capacitor or resistor values in the parts lists. They appear only on the schematics.
- No schematic or parts list for the power supply, which Amstrad lists only as a complete unit (UN-1, part 270492).
- No fault-finding charts, test points, adjustment procedures or disassembly instructions beyond the exploded view.
- No text layer.
Pages that cite this document
[edit | edit source]- Amstrad ALT-286 and Amstrad ALT-386SX – specifications, parts and board numbers
- Amstrad ALT-386SX Maintenance Guide, Amstrad ALT-386SX Troubleshooting Guide, Amstrad ALT-386SX Capacitor Replacement Guide
- Amstrad ALT-286 Maintenance Guide, Amstrad ALT-286 Troubleshooting Guide, Amstrad ALT-286 Capacitor Replacement Guide
Download: Amstrad ALT286 ALT386SX Service Manual.pdf