Question about Sony CMT-CP100 CD Shelf System

2 Answers

Memory Loss I own a CMT-CP100 system which was working excellently until recently. The problem it developed is that once the mains power is disconnected, it looses all the pre-tuned station information. This was previously not so. I have resetted the system but that did not help. Your assistance is requested. Best Regards, Hugh.

Posted by Hugh Cross on

  • Anonymous Nov 02, 2007

    Our power was out for several hours and the Sony MHC-RG20 lost all the radio presets. I'm unable to find the manual and don't remember how to set the presets.



    Thanks for any help you can give.

    Alaskan.Fox

  • Anonymous May 24, 2009

    I have a nakamichi sound space 3 and when the power goes out I lose my presets and alarm settings?

    I know it is related to an internal battery but I can't seem to locate it? I have not removed the screws and opened the unit up yet. I figured I would ask if anyone had an idea on where the battery might be?

    Thanks,
    Frank


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Anonymous

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Many devices utilize a small battery for system memory purposes, such as radio station presets. It draws a small continuous current for that purpose. If your system used to keep the presets when disconnected, then I would guess that?s the case. Search for a small battery compartment in the back of the system, take out the battery and take it with you to be replaced with one just like it. If that doesn't fix it, then i hope you're still under warranty, otherwise either you'll have to live with it or take it to a repair shop. Good luck!

Posted on Jan 30, 2006

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Dan Nygren

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I have a Sony CMT-CP11 with the same issue (when power is removed, radio station presets are lost). I found a schematic on-line and searched for a battery or large capacitor in the bill of materials (BOM). I found a "supercapacitor" in the design. It had a very large capacitance 0.22F. That's 0.22 Farads, not microfarads. So I found a replacement at mouser.com. Mfr: Elna: Mfr Part Number: DX-5R5V224U 0.22F 5.5V Vertical Mount. I located and desoldered the existing part on the printed circuit board (Reference Designator C810) and replaced it with the new part (Make sure you install with the polarity correct!). Now if I remove the power, my station presets are not lost when power is restored.

Posted on Jul 09, 2021

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