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Sony ST-JX220 AM/FM Tuner

 
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mitten58



Joined: 23 Nov 2008
Posts: 31

PostPosted: Wed Jan 01, 2020 4:56 pm    Post subject: Sony ST-JX220 AM/FM Tuner Reply with quote

I'm posting this because the one "fix" for this component does not appear to be available elsewhere.

The Sony ST-JX220 AM/FM tuner is a digital AM/FM tuner, intended to feed into a separate amplifier.

The memory "keep alive" battery is hardwired to the circuit board. After the battery dies, unplugging the component from the wall plug results in the AM-band tuner reverting to frequencies (like 576 kHz) and frequency steps ( 9 kHz steps) that are used outside of North America.

To reset the AM tuner for North American use:
1) Plug the component in, and turn it on.
2) Set the band switch to the AM band
3) Push and hold the "Tuning +" button down.
4) Turn the component off, then back on again.
5) Now you can release the "Tuning +" button.

This should reset the component.
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The Robman
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Joined: 01 Aug 2003
Posts: 19458
Location: Chicago, IL

PostPosted: Wed Jan 01, 2020 6:26 pm    Post subject: Reply with quote

Thanks for that. Did you also replace the "keep alive" battery?

I found the instructions on how to replace it here:

sky_tech wrote:
I just replaced the same battery on my ST-JX520. There are a few approaches. First off, yes, it's soldered in, so first you will want to unsolder the old one. If you work carefully you don't have to remove the PCB. Just remove the front panel unit (3 screws) and fold it over the top of the tuner. Do be careful, though, that the sharp heatsinks don't scratch the top of the front bezel as you lay it back over the unit.
Use a good soldering iron with a moderate sized tip (the pad on the bottom of the board are big and the battery tabs also draw away a lot of heat). Heat the edge tab (the one that starts on the top of the battery and wraps around) while lifting that edge of the battery until the tab is free from the PCB. They heat the other tab and remove the battery. Now use solderwick or a vacuum-plunger solder-removal tool to remove the solder that's blocking the hole (you can use the vacuum-plunger removal tool from the top while heating the bottom. Then, to install a new battery your options are:
1) Buy an exact replacement with tabs (available from various suppliers - search for CR-2025 tabs or see below).
2) Add a battery holder along with a standard 2025 or 2032 battery (either will do). I went this route, but mounting the battery holder took a little bit of creativity for the holder I had. You can get ones with wires and just tape it up and set it somewhere.

CR2025 with tabs:
Renata 614-CR2025FH-LF from Mouser Electronics:
https://www.mouser.com/ProductDetail/?qs=%252bJ68kkgkfTrYGMMNh4BxJg%3D%3D
or other suppliers
http://www.weisd.com/test/WEISD_TBL_view.php?editid1=DANCOMP-31-1

CR2032 with tabs for vertical mount. This actually looks like it will fit the mounting holes better and vertical mount is fine:
https://www.mouser.com/ProductDetail/?qs=5D6tm72Z2%252bnF72f6fy0RlQ%3D%3D


There's also a repair video here:
https://www.youtube.com/watch?v=QsX2e1kLb98
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Rob
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Please don't PM me with remote questions, post them in the forums so all the experts can help!
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mitten58



Joined: 23 Nov 2008
Posts: 31

PostPosted: Mon Jan 06, 2020 1:07 pm    Post subject: Reply with quote

Thanks for the links. At least my panel lights are still OK (knock on wood).

I haven't replaced the battery, the battery mounting is a bit different on my model. Maybe I'll scrounge a battery holder off of an old PC motherboard and give it a try.

(I loved my local Radio Shack. Now everything comes with "minimum shipping cost", sigh. And don't get me started on the price of "N" cell batteries -- used to be 39 cents each at Radio Shack.)
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The Robman
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Joined: 01 Aug 2003
Posts: 19458
Location: Chicago, IL

PostPosted: Mon Jan 06, 2020 1:22 pm    Post subject: Reply with quote

Don't forget that eBay is a great resource for stuff like that too, especially if you don't mind waiting for it to arrive from China.

For example, here's 20 for $11:
https://www.ebay.com/itm/262616022099

or just 2 for $6:
https://www.ebay.com/itm/283530766246

or 1 for $3.28:
https://www.ebay.com/itm/131851740925

Of course, you could always just grab a regular CR2025 battery from Walgreens and solder on leads in order to mount it.

And just FYI, searching for info for this lead me to discover the 12voltvids YouTube channel, which has some great videos on how to fix old electronics.
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