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Sony CFD-S05 CD Radio Cassette Player was released in 2010, and has the CD-R/RW playback function.

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Extremely low volume on all settings

When I start the CD player or radio the volume ist almost inaudibly low. It doesn't increase with setting for volume.
It's a Sony CFD-S05 model casette, cd and radio.

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So I found the solution. In my case the capacitor C303 by the side of IC301 on the mainboard was getting super hot and the chip didn't get the voltages it needs. After replacing it with another capacitor of the same voltage rating and capacity (100µ,10V (105°C)) but with higher temperature rating, the device works perfectly again.
If anybody has the same problem, this Sony CFD S05 SM document helped me to understand which chip is involved in determining the volume and where to look.

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Hi, I had the very same problem but with the CFD-S07CP model and this solution fix the volume issue. Thank you so much for the info.

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Pelle Tuulison será eternamente grato(a).
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