Boombox Sony CFD S350 - No Audio Volume Repair. Step by Step Troubleshooting.

Sony convex speakers demonstrated • SONY convex speaker (C...
These are great sounding players but they are plagued with bad electrolytic capacitors.
I also found the following comment on the same Sony CFD S350 player: "If you have no power when you press the power button then replace C822 , 220 µF 10V on the main board. If this capacitor is faulty, Vcc for the main CPU IC801 is not present so nothing works at all."
A 64-page Service Manual for CFD S350 is available for download for free from elektrotanya.
elektrotanya.com
Add the following part to the address above:
/sony_cfd-s350_cfd-s350l_sm.pdf/download.html

[@THOMMGB]

Hi, I've got the same Sony boombox. It works fine, but the cassette speed is off - it plays noticeably too fast. Do you know if the cassette motor has a speed adjustment? I'm guessing there's something somewhere. I suppose I need to stay alert for bad capacitors in the future as well?
I enjoyed watching you troubleshoot and repair this boombox. I really like mine. I picked it up at my local Goodwill store for $20.00 a few months ago. All is well with this boombox except for the cassette speed being too fast. Regards, Thomas

[@tektech1065]

On page 14 of the 62-page version of the Service Manual for CFD S350, you will find the procedures for mechanical and electrical adjustments. This Service Manual is available for download for free from elektrotanya - see the page address included in the video description. The bottom right corner of page #14 shows picture with the location of that adjustment: it's a tiny hole in the back of the motor. A small flat screwdriver will adjust the speed.
It might not be possible to make the speed adjustment and listen to tape at the same time because you may have to disconnect the cables in order to gain access to the back of the motor. If that is the case, then make one tiny turn at a time (3-5 deg.) with screwdriver and reconnect all to listen to the tape. Turning the adj. counter-clock wise will most likely slow it down. Volcals make it easiest to detect the wrong pitch. Good luck!

[@THOMMGB]

@@tektech1065Thank you so much for this information. I tried to send you a message yesterday, but there was some kind of problem that wouldn’t allow me to post a big THANK YOU for all your help and advice. It finally dawned on me to go straight to the video and respond this way.😊