Editing Amstrad CPC 664 (section)

=== The drive belt ===

'''The perished belt is the characteristic 664 fault.''' The motor runs, the disc does not, and the machine reports a read failure on a known-good disc.

Amstrad publishes no belt dimensions. The community specification for the CPC 664 / 6128 / FD-1 3-inch drive belt is '''3 mm wide, 0.6 mm thick, 230 mm outer circumference''' — often advertised as "115 mm", which is the flat length.<ref name="cpcbelt">[https://www.cpcwiki.eu/index.php/Changing_the_drive_belt "Changing the drive belt"], CPCWiki — gives the replacement belt as 3 mm wide, 0.6 mm thick and 230 mm outer circumference (commonly advertised as 115 mm), with the removal procedure. Secondary source; Amstrad published no belt dimensions.</ref> Measure your own pulleys before ordering.

'''The spindle speed is adjustable at VR201''' on the drive's own control PCB, to an index period of 200 ms — one revolution at 300 rpm.<ref name="sm664" /> Full procedure on [[Amstrad CPC 664 Maintenance Guide]].