Question about Proton R5A Clock Radio

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

Radio works fine except the power back-up function has ceased to operate - was OK for about 12 years. Now, whenever there is a power glitch (even for a millisecond) it looses the time and all presets. A real chore to reset ever time and if the glitch occurs during the night I don't get my wake-up music. What component has gone bad? Can you specify it and its location so I can get a new one and replace it? I have never opened up the case since I purchased it. Proton Radio Model RS-420 and S#RS420008283

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  • mrpauls Mar 31, 2008

    Same problem. No battery backup but original box says built in rechargeable battery. Also, I need to recall how to set what radio station comes on when you use the alarm. email me at if you have the answer. Thanks

  • asureyes Jan 12, 2009

    Yes the back up battery has lost its ability to holds a charge, I need to find the circuit boad power supply and replace the batter. Anyone with a schematic on the curcuit ?

    Note, the alarms (both) default to the last station tuned to from the normal operatoin tuning, not the pre set keys.

  • adamsusa Feb 15, 2009

    Same problem - loses settings after power outage (and boss is getting pissed about me showing up to work late ;)).

    I just opened up my unit, don't see anything that looks like a battery. Any help here available?



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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.


- Phil

Posted on May 31, 2009

  • wapco46
    wapco46 Nov 02, 2012

    My battery is a Varia 11DK, and you could read that other number as 098 or 860. Have you come up with a replacement yet? It's too good a radio not to fix. Thanks



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Battery back-up operation

* This clock radio is equipped with

a memory holding system that can

be powered with 2 "AA" batteries

(included). The power failure

protection circuit will not operate

unless battery is installed.

* When normal household power

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