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Old 3rd June 2013, 07:51 PM   #1
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Default Why does my booxbox not save my radio presets?

I have a JVC boombox and it seems to work fine except for the fact that it does not save the radio presets when it is turned off. I think it used to save the presets just fine, but now when I turn the radio off and on, the presets are no longer there. The radio does stay plugged into the electrical outlet in the wall while it is off though. I would appreciate some advice on how to fix this problem.

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Old 3rd June 2013, 08:04 PM   #2
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It might be worth seeing if there's a little watch battery in there that's died - such things are often used in computers to keep the time, so I'd expect similar usage here.
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Old 3rd June 2013, 08:22 PM   #3
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But that's for when the unit is unplugged. I am guessing something has gone wrong.
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Old 3rd June 2013, 08:27 PM   #4
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Some of them use a SuperCap. Try looking for a 1F 5V or similarly huge value cap.
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Old 3rd June 2013, 10:11 PM   #5
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may be a bad cap as katieandDad posted, also look at the resistors and diodes. The resistor is for the charging of the cap, and the diode allows current flow in 1 direction.
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Old 3rd June 2013, 11:01 PM   #6
Enzo is offline Enzo  United States
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But that's for when the unit is unplugged.
But isn't that his problem? When power is removed it forgets everything. Certainly that is the first place to look: dead memory battery. We see that in pro audio all the time. SYnthesizers usually have patches in memory that can be edited by the user. Lose the battery and the memory resets to factory or turns to gibberish.

The unit either has a battery backed memory, or some sort of flash memory. And yes, a super cap could be used in place of a battery in many places.
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Old 4th June 2013, 10:01 AM   #7
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I have come across a tuner that lost its settings due to a small serial EEPROM failing
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Old 4th June 2013, 10:25 AM   #8
FoMoCo is offline FoMoCo  United States
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Originally Posted by davidsrsb View Post
I have come across a tuner that lost its settings due to a small serial EEPROM failing
I'd put my money on this. Either that or the EEPROM is built into the micro and has failed from too many writes.
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Old 4th June 2013, 12:53 PM   #9
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But isn't that his problem?
Not according to the OP. This is while it is plugged in.
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Old 4th June 2013, 01:37 PM   #10
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If the SuperCap has failed it might just drag down the EEPROM memory.
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