Editing Amstrad CPC 464 Capacitor Replacement Guide (section)

== Cassette Sub-PCB Capacitors (CPC 464) ==

The cassette sub-PCB carries the audio amplifier IC301 (LA4140), the cassette read amplifier IC302 (LA6324), the cassette motor relay RY301, and the volume control VR301. Capacitors per the service manual:

{| class="wikitable styled-table" style="width:100%; text-align:center;"
|+'''CPC 464 cassette sub-PCB &mdash; electrolytic capacitors'''
! Designator !! Value !! Voltage !! Function
|-
| C301 || 100 µF || 10 V || Power supply bypass at LA4140 audio amp (IC301)
|-
| C303 || 47 µF || 10 V || LA4140 input coupling
|-
| C304 || 100 µF || 10 V || LA4140 output coupling to speaker
|-
| C306 || 47 µF || 10 V || LA6324 cassette read amp bypass
|}

These four sub-PCB electrolytics are aged 35+ years and are the most common capacitor faults in the CPC 464 audio chain. Symptoms include reduced speaker volume, distorted audio, intermittent cassette read, and noise on the AY-3-8912 output.