RetroTechCollection

Amstrad PC 2386 Service Manual: Difference between revisions

← Older edit

Josh (talk | contribs)

8 user groups
19,115 edits
undo
VisualWikitext
Real documentation page: cover title PC2386-65, contents, the full technical specification (20 MHz 80386, 64K/35 ns cache, five 16-bit slots, 65 MB 1:1 hard disc), the safety-test figures, and - most useful - Amstrad's own notes to engineers, which forbid component-level repair of the CPU PCB and the drives while explicitly permitting it on the PSU and monitors, which is why a PSU schematic is included
Link the separately hosted pages 47-48; list citing pages
 
(One intermediate revision by the same user not shown)
Line 1: Line 1:
The '''PC2386-65 Personal Computer Service Manual''' is Amstrad's own service manual for the PC2386. 46 pages. '''No text layer''', so values must be read from the page images.
<templatestyles src="Template:StyledTable/styles.css" />
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 two missing pages, the cabinet exploded view and parts list (p. 47) and the power supply chassis schematic (p. 48), are hosted separately as [[:File:Amstrad PC 2386 Service Manual pages 47-48.pdf]], taken from another scan of the manual.


== Contents ==
== Contents ==


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


* Technical specification; notes to engineers; safety tests; '''alignment instructions'''
* Technical specification, notes to engineers, safety tests – 2
* Memory and FDD expansion PCBs
* Alignment instructions; memory and FDD expansion PCBs – 3
* Main PCB top and bottom views; expansion board / LED PCB top and bottom views; power / keyboard / bug PCBs
* Main PCB top view 4 and bottom view 5
* Interconnection diagrams; '''chassis schematic diagrams'''
* Expansion board/LED PCB top view 6 and bottom view 7
* Keyboard chassis schematic diagram
* Power/keyboard/bug PCBs – 8
* '''Electrical parts list'''
* Interconnection diagrams 9–10, 16–17, 30–31
* Keyboard exploded view; cabinet exploded view and parts list
* Chassis schematic diagrams 11–15, 18–29, 32–41
* '''Power supply chassis schematic diagram'''
* Keyboard chassis schematic diagram – 42, 43
* Electrical parts list – 44, 45
* Keyboard exploded view – 46
* Cabinet exploded view and parts list – 47 (in the separate file)
* Power supply chassis schematic diagram – 48 (in the separate file)


== What it settles ==
== What it covers ==


'''Technical specification''': '''80386 at 20&nbsp;MHz''', zero wait states, '''32-bit full-width main memory''', 80387 socket, '''4&nbsp;MB of parity-checked RAM''', a '''64K / 35&nbsp;ns RAM cache''', '''five 16-bit expansion slots''', asynchronous bus operation, a 65&nbsp;MB hard disc option at 1:1 interleave, 1.4&nbsp;MB floppy drives, connectors for an external 5.25-inch or 3.5-inch drive and a tape streamer, Hercules/CGA/EGA/VGA compatible video, a bi-directional parallel printer port, an RS232 serial port, battery-backed clock and configuration RAM, a Microsoft-compatible mouse, a 101/102-key AT keyboard with a security lock, a speaker volume control, built-in LIM 4.0 with a RAM division option between conventional, extended and LIM, and Novell NetWare server compatibility. System unit 415 × 160 × 485&nbsp;mm; keyboard 475 × 35 × 200&nbsp;mm.
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.


'''Amstrad's notes to engineers set the repair policy, and they are unusually blunt:'''
The alignment instructions (p. 3) are for the power supply and the clocks:


* "'''no component level repairs are to be carried out on Main CPU PCB'''. After diagnosis test if the fault is confirmed replace CPU PCB."
{| class="wikitable styled-table" style="width:80%; text-align:left;"
* The same applies to '''the floppy and hard disc drives''', and any attempt to repair or replace parts within them invalidates the warranty.
|+'''PC2386 alignment (p. 3)'''
* '''"PSU &amp; Monitors are subject to component level repairs."'''
! 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
|}


That last sentence is why this manual includes a '''power supply chassis schematic diagram''' but treats the mainboard as an exchange unit. It is also a caution for anyone reading the electrical parts list: Amstrad expected it to be used for the supply and the peripherals, not for board-level repair of the CPU PCB.
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.


'''Safety test figures''': flash test at '''1.5&nbsp;kV RMS for 3&nbsp;s''' between mains live/neutral and all accessible exterior metal; insulation resistance at the same voltage showing '''greater than 4&nbsp;M&#937;'''; and '''earth continuity of the mains lead not exceeding 0.5&nbsp;&#937;'''.
== What this manual does not contain ==
 
* The power supply schematic and the cabinet parts list, which are missing from this scan and hosted separately; see below.
* 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.
 
== Pages that cite this document ==


== What this manual does not contain ==
* [[Amstrad PC2386]] · [[Amstrad PC2386 Maintenance Guide]] · [[Amstrad PC2386 Troubleshooting Guide]] · [[Amstrad PC2386 Capacitor Replacement Guide]]
* [[Amstrad PC2286]] and its guides, for the supply parts that match the PC2286's
 
== Related pages ==


* '''No CPU board component-level repair information''', by Amstrad's explicit instruction.
* [[Amstrad PC 2086 Service Manual]]
* '''No drive service data.'''
* '''No monitor sections''' — unlike the PC2086 manual, no display is covered here.
* '''No fault-symptom table or diagnostic flowchart.'''
* '''No text layer''', so nothing can be searched.


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


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


== Related pages ==
Pages 47–48: [[:File:Amstrad PC 2386 Service Manual pages 47-48.pdf|Amstrad PC 2386 Service Manual pages 47-48.pdf]]


* [[Amstrad PC 2086 Service Manual]] · [[Amstrad PC 2640 Service Manual]]
<pdf> File:Amstrad PC 2386 Service Manual pages 47-48.pdf </pdf>


[[Category:Amstrad Service Manuals]]
[[Category:Amstrad Service Manuals]]
[[Category:Service Manuals]]
[[Category:Service Manuals]]
Retrieved from "https://wiki.retrotechcollection.com/Amstrad_PC_2386_Service_Manual"