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RS 420 Clock Radio user manual - Proton Audio Players & Recorders

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Posted on Jan 02, 2017

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SOURCE: Grundig sonoclock 420 radio/alarm

Hello Sally,
here is the solution :)


https://dex.grundig.de/GIM/internet/document/GKL0151D.PDF

maybe it doesn´t work try this site and choose

http://www.grundig.de/index.php?id=9

Greets
miieke

Posted on Aug 12, 2008

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SOURCE: Proton Model RS-420 clock radio lost power back-up

The battery is located on the display circuit board at the front of the unit. It's a bit of a pain to get to.

You'll need to open the case, unplugging the wiring harness plugs so you can take the two halves apart. Next, remove the strip of circuit board at the top where the snooze/alarm and other top button switches are. Then you will be able to get to all of the screws holding the display circuit board to the front of the case. The battery is soldered to the board. I'm not sure what type or voltage it is, but it's probably a single-cell NiCd at 1.2v. I think the best replacement would be a supercapacitor but I need to figure out exactly what the battery is first.

It's a great radio that's worth fixing. If anyone can tell us what the battery is, please post! Mine says "860" on it.

Cheers,

- Phil

Posted on May 31, 2009

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Proton Model RS-420 clock radio lost power back-up


The battery is located on the display circuit board at the front of the unit. It's a bit of a pain to get to.

You'll need to open the case, unplugging the wiring harness plugs so you can take the two halves apart. Next, remove the strip of circuit board at the top where the snooze/alarm and other top button switches are. Then you will be able to get to all of the screws holding the display circuit board to the front of the case. The battery is soldered to the board. I'm not sure what type or voltage it is, but it's probably a single-cell NiCd at 1.2v. I think the best replacement would be a supercapacitor but I need to figure out exactly what the battery is first.

It's a great radio that's worth fixing. If anyone can tell us what the battery is, please post! Mine says "860" on it.

Cheers,

- Phil

Apr 30, 2007 | Proton R5A Clock Radio

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