Editing Amstrad CPC 664 (section)

== The monitor is the power supply ==

Like the 464, '''the CPC 664 has no mains connection and no internal power supply''' — but it needs '''two''' DC feeds, not one. Amstrad's specification lists a socket for the 5 V supply from the monitor, and a plug and lead that goes '''out''' to the 12 V disc power socket on the monitor.<ref name="sm664" /> The CTM644 colour monitor and the GT65 green monitor provide both.

In the parts list these are '''J301''' (DC jack, Amstrad part 170024 — the same part as the 464's J104) and '''CD301''' (DC cord, part 170822).<ref name="sm664" />

'''There is no five-pin DIN power connector on this machine.''' The 5-pin DIN on the back is '''J302''' (part 170819), the '''external cassette recorder''' socket; the 3.5 mm socket is '''J103''', stereo audio out.<ref name="sm664" />

'''A drive that will not spin is very often a 12 V problem, not a drive problem.''' That rail comes down a separate lead from the monitor and that lead is a single point of failure. Check it before opening the drive.