Question about Sony CMT-CP100 CD Shelf System
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
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
Tips for a great answer:
a spreadsheet developed by Microsoft but is by no means the first spreadsheet.
The very first spreadsheet was developed
(or invented) by Dan Bricklin and Bob Frankston called VisiCalc. VisiCalc was a
spreadsheet written to operate on the Apple II computer and was released
in 1979. The program was sold to Lotus who developed Lotus 123 from the
VisiCalc principle. Lotus 123 was released in 1983.
Excel, first released in 1987, is a
development of the early spreadsheets and therefore cannot strictly be
classified as an invention. Excel is far more powerful than VisiCalc but that
is also a result of development over the years that Microsoft have been working
on the product, and the increase in computing power.
Dan Bricklin and Bob Frankston never patented the product because software patents were almost unheard of in the 70s.
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