Question about RCA RP5420 Clock Radio

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Small black device within RCA RP5420

For several weeks, I had been hearing crackling noises coming from my RCA RP5420 alarm clock. I assumed it was coming from the speaker for the radio, but I listened closely and realized it was coming from the bottom of the clock, not the speaker. So I opened up the clock and looked inside and I saw that is a small circular plastic device on the bottom of the clock with a red and black wire coming out of it. I listened again and realized that the crackling noise was coming from this black device. I decided to cut the thin wires that connected the black device to the circuit board. When I did so, the crackling noise went away and the clock seems to be working fine. The radio works, it keeps time, and the alarm works. My question, what was that black device? What was its purpose? What did cutting the wires do and did it ruin the clock?

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Re: Small black device within RCA RP5420

That black disc is the "backup" alarm if you lose power.... The battery then takes over and "buzzs" throught that little speaker too wake you... even tho there is no power... Mine buzzes too... cut that little speaker outta there.!


Posted on Jul 23, 2008

Re: Small black device within RCA RP5420

Thanks Hikitomete, your solution fixed my clock cracking noise. In case you are still wondering, that black disk is a piezo disk. They are commonly used to make noise for buzzers in electronic devices, though on this clock radio it doesn't seem to do anything other than make an annoying cracking nose. Cutting the wires won't do anything bad to your clock other than perhaps stopping a click or buzz at some time.

Posted on Jan 08, 2008

Re: Small black device within RCA RP5420

Thanks Hikitomete, my clock was pissing me off by crackling so much. I popped it open and cut the wires, and the problem stopped

Posted on Dec 23, 2007

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moz-screenshot.jpgRCA RP5420


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