Editing Amstrad PC 2386 Service Manual

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The '''PC2386-65 Personal Computer Service Manual''' is Amstrad plc's service manual for the PC2386. The contents list runs to page 48. The hosted scan has 46 pages and no text layer, and it ends at printed page 46: the cabinet exploded view and parts list (p. 47) and the power supply chassis schematic (p. 48) are missing.

== Contents ==

Amstrad's contents list, with printed page numbers:

* Technical specification, notes to engineers, safety tests – 2
* Alignment instructions; memory and FDD expansion PCBs – 3
* Main PCB top view 4 and bottom view 5
* Expansion board/LED PCB top view 6 and bottom view 7
* Power/keyboard/bug PCBs – 8
* Interconnection diagrams 9–10, 16–17, 30–31
* Chassis schematic diagrams 11–15, 18–29, 32–41
* Keyboard chassis schematic diagram – 42, 43
* Electrical parts list – 44, 45
* Keyboard exploded view – 46
* Cabinet exploded view and parts list – 47 (not in the scan)
* Power supply chassis schematic diagram – 48 (not in the scan)

== What it covers ==

The specification on page 2 gives an 80386 at 20&nbsp;MHz with 0.05 wait states, 32-bit memory, an 80387 socket, 4&nbsp;MB of parity-checked RAM, a 64K 35&nbsp;ns cache, five 16-bit expansion slots, 1.4&nbsp;MB floppy drives, a 65&nbsp;MB hard disc option, Hercules/CGA/EGA/VGA-compatible video, built-in LIM 4.0, and MS-DOS 4.0 with Windows/386. The system unit measures 415 × 160 × 485&nbsp;mm.

The alignment instructions (p. 3) are for the power supply and the clocks:

{| class="wikitable styled-table" style="width:80%; text-align:left;"
|+'''PC2386 alignment (p. 3)'''
! Step !! Method
|-
| +5&nbsp;V || Voltmeter at test point A; set VR604 to 5.00&nbsp;V ±0.05&nbsp;V
|-
| +12&nbsp;V || Voltmeter at test point B; set VR603 to 12.00&nbsp;V ±0.05&nbsp;V
|-
| VCO control voltage || Voltmeter at pin 6 of IC316; set TC301 to 3.5&nbsp;V
|-
| Primary protection || Turn VR601 anticlockwise until the protection starts to cut in, then back a little
|-
| Real-time clock || Timing meter at pin 21 of IC115, 0.2&nbsp;s/day setting; set TC101 to read 0.00
|}

The notes to engineers (p. 2) forbid component-level repair of the main CPU PCB, which is to be replaced once a fault is confirmed, and of the floppy and hard disc drives; "PSU & Monitors are subject to component level repairs." The safety tests are a 1.5&nbsp;kV RMS flash test for 3&nbsp;s, an insulation test requiring more than 4&nbsp;MΩ and a mains-lead earth continuity of no more than 0.5&nbsp;Ω.

== What this manual does not contain ==

* The power supply schematic and the cabinet parts list, which are missing from this scan.
* Component-level data for repairing the CPU board or the drives, by Amstrad's policy.
* Any monitor sections.
* Fault-finding flow charts.
* A text layer.

== Related pages ==

* [[Amstrad PC 2086 Service Manual]]

<pdf> File:Amstrad PC 2386 Service Manual.pdf </pdf>

Download: [[:File:Amstrad PC 2386 Service Manual.pdf|Amstrad PC 2386 Service Manual.pdf]]

[[Category:Amstrad Service Manuals]]
[[Category:Service Manuals]]