Stock radio questions

[Letters909]

Got a stock radio from a jy car and I was wondering if anyone knew what the round connection on the back is, I'll put up a picture when I'm home.

I also ordered new antenna wire but I don't know how I should solder it to the board. I already de-soldered the wire that was on there but I can't remember if it was the inner wire or the braided wire that was that was actually connected. I want to say that the braided wire is what was making the connection but from my understanding it's the inner wire that makes the connection and the braided wire acts as insulation to keep interference from coming through the speakers.

As always any help is appreciated.

[MR_Loyale]

You shouldn't have to solder the antenna to the radio. It should plug in. The braided wire is the ground shield and the inner wire is the signal.

[Letters909]

I'll post pics when I'm at home but it was soldered in, there's no where for an antenna wire to plug in but there is a spot on the board for one, where I heated up the solder and removed it since I had to cut it out of the jy car

[ducunee]

Round plug is for optional cassette player

[Letters909]

Awesome thanks, that's what I figured but wasn't sure

[Numbchux]

Yep, optional cassette player. I've never compared them directly, but I bet it's the same one used in the '90s for the optional CD player, which I used to add a cheap AUX input.

 

http://www.ultimatesubaru.org/forum/topic/158107-i-added-an-aux-input-to-my-stock-97-radio/

[Letters909]

That's awesome thanks, I'll probably do this and forget about the antenna all together. Any tips on doing this?

[Letters909]

Well this is what the connector looks like on my radio, back to an antenna for me I suppose

edited to add second picture

The hole for an antenna

Edited November 14, 2016 by Letters909

[TomRhere]

Solid line = inner antenna wire.

Dashed line = shield (braided) wire.

[Letters909]

Thanks Tom, didn't notice that when I removed it

 

I noticed some corrosion on the bottom of the board, what's a safe way to clean it off? Or should I just leave it? It doesn't seem to be affecting anything at the moment

[DaveT]

90% rubbing alcohol is usually safe for circuit boards. The other answers you have sound correct.

[Letters909]

Thanks for all the help guys, anyone have any info on the connector in the picture I put up? I figure the same trick would work if I knew what pins were L, R, + - and ground. Is there a way for me to figure that out on my own?

[DaveT]

Ohm meter from ground to each pin will find you gnd.

 

To find the L R inputs, set the radio to aux or whatever it has. Use a music player / phone headset output for a signal. To be safe, put something like a 2000 ohm resistor and a 1uf capacitor in series with the signal from the player to the pin you are testing.

[Letters909]

the radio its self doesnt have any way to switch to another input, it can only switch between am and fm

[skishop69]

It automatically switches when a tape is played in the optional tape deck. There's a write up here for how to convert the plug to an aux input.

[Letters909]

Do you have a link? I found one for turning the 7 pin din into aux, but nothing mentions the 8 pin connector thats on my radio