Editing Amstrad CPC 664 Maintenance Guide (section)

== Capacitor Health ==

The 664 main PCB inherits all the [[Amstrad CPC 464 Capacitor Replacement Guide|CPC 464 capacitors]] in the non-cassette area, with the following changes:

* '''Cassette sub-PCB caps (C301, C303, C304, C306, C322, C315) are absent''' on the 664 because there is no cassette deck.
* The disc-controller area adds bypass capacitors near the NEC uPD765A FDC, near the AMSDOS ROM socket, and on the drive power input. Specific designators vary by board run; the most-failing positions in field service are the '''470 µF/16 V''' on the drive +12 V input and the '''10 µF / 22 µF''' caps near the FDC chip.

Full list with values and recap procedure: [[Amstrad CPC 664 Capacitor Replacement Guide]].