Editing Amstrad PC 2386 Service Manual (section)

== What it settles ==

'''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.

'''Amstrad's notes to engineers set the repair policy, and they are unusually blunt:'''

* "'''no component level repairs are to be carried out on Main CPU PCB'''. After diagnosis test if the fault is confirmed replace CPU PCB."
* The same applies to '''the floppy and hard disc drives''', and any attempt to repair or replace parts within them invalidates the warranty.
* '''"PSU &amp; Monitors are subject to component level repairs."'''

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.

'''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;'''.