Question about Proton R5A Clock Radio
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
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.
Posted on May 31, 2009
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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
is interrupted, or AC line cord
is unplugged, the batteries will
power the clock radio to keep
track of time and alarm settings
programmed into memory.
* When the battery backup functions,
the digital display will not light,
however, the function of alarm
still occurs during the power
interruption if remaining battery
power is adequate.
* Normal operation will resume after
AC power is restored so you will not
have to reset the time or the alarm
To install batteries:
1* Remove battery compartment door
(located at the bottom of the radio)
by applying thumb pressure to the
tab on battery door and then lift
the door out and off the cabinet
2* Insert 2 AA batteries (included).
3* Replace the compartment door
Replace batteries every year.
Power is fed to the unit even
when it is not functioning. To
cut the power supply off, the
power cable must be unplugged
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