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Where do I Solder the battery wires?

Hey everyone,

I love old tech, and I found this old portable cassette recorder at the thrift store and had to get it. Well it was, for a lack of better words, a little gummy/sluggish/jammy. It wasn't preforming at its best, so I opened it to clean it and replace its worn and stretched belts.

After I opened it, about half way through the repair I noticed the battery wires disconnected from the board. Well I can solder no prob, but I haven't a clue as to where they solders though.

So I was hoping you guys could maybe offer some help?

The model is General Electric portable cassette recorder 3-5003A

Thanks

-Liz

Pictures:

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Update:

Battery wires

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Back of Board

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(the furthest on the right is the 6v/DC port)

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Front of Board

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I hope that's better. :) Thanks

The board still needs some cleaning. ._. With how much substance was dried inside, I'm surprised there wasn't more problems.

-Liz

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There is also an AC. Adapter port, if that helps answer my question.

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Sorry, it's super hard to tell what is going on. Could you get more photos with better lighting?

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I tried. I dunno if it's better. If not, I'll try to get pictures using a camera and not my phone. Thank you!

-Liz

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@wheeljack , Liz, Just a thought, if wires have not been stretched out and still have sort of the original bends, try seeing which solder contact points they reach and then with magnifying glass, see if you can see traces of copper strands sticking out of solder points(something like doing forensics). Just do not plug into 110v while wires are hooked up until certain working off battery power. Good luck.

I hope this helped you out, if so let me know by pressing the helpful button.

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Hello L Pfaff,

Yeah, I've tried that. ._.But, I didn't try with a magnifying glass though, and will try in a bit.

I just kicking myself for not taking a picture before working on it.

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The magnifying glass did the trick! Thank you. :)

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Liz, that's great glad to have helped and thanks for replying back.

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Hi @wheeljack

Have you tried working back from the power switch (if it has one) to see where it goes to?

Also if there is no power switch then sometimes on cassette players the control buttons had the power going through them e.g. Play, FFWD, REW, etc. Chase the wiring back from them.

If that does no good and as I cannot find a schematic online you might wish to try contacting the people in this link to see if they have the service manual for your player. They say if they have it them it would only cost between $3-$20 for a copy. Worth it if they have and you are keen to fix it.

http://www.stereomanuals.com/man/pdf/ind...

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Thanks Jayeff, I can't find schematics or a manual online, and your site you provided PDFs are down. I could contact them, but I only paid $4 on the device. So, Im really not sure if I want to pay for a schematic. Plus I would only use it for this one solder job. I was just hoping to find someone who knew where to solder it.

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Hi @wheeljack ,

OK the only other thing that I can suggest is to chase back the circuit board tracks to see if there are two common connection points close to each other for the +ve and -ve supply rails.

The electrolytic capacitors are a good place to start. Start with the biggest as these are usually filter caps for the power supply. They are useful as the caps are marked with a -ve line on them , so that means that that leg of the cap will be tied to Earth (ground). Usually to make circuit boards easier to configure there is an earth plane around the board (big area of metal not thin tracks) and it should go to the -ve supply rail. (Black is -ve). The other leg of the cap is the +ve leg and should eventually go back to the +ve supply rail. (Red is +ve)

Do not just follow from one cap. When you find where the +ve and -ve go from one , chase it from another and see if you get back to the same points eventually.

Hopefully this makes a bit of sense to you.

"Welcome to the wonderful world of fault finding at component level without the aid of a circuit diagram"

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Very interesting, thank you for the information.

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