Jensen Model Awm960

[outlawz]

I am trying to trouble shoot this radio. When it is hooked up, the display comes on but the power and any of the other buttons will not work. Broke it down and found the ribbon cable looks like it might have gotten hot. Can anyone verify these two resisters are bad before I pull them? They look like they are toasted to me.

[outlawz]

Re: Jensen Model Awm960

OK, I did not get a response on that one. So I pulled the resistors and on the big one I am getting 7.9 ohms and on the little one I get 3.2 ohms. Now I am trying to check the color codes to see if that is within tolerance. But it is hard to tell the colors. Can any one else please give me a input!

[Khron]

Re: Jensen Model Awm960

I'm reasonably sure they're actually inductors

If you look carefully between the fatter one and that shielding "wall", you'll notice "L2 1mH" silkscreened in white, on the board, and i can barely make out something like "L3 10uH" between the fat one and the smaller one.

And they don't really look toasted to me, anyway. Looks more like they've had some epoxy or laquer applied on / between them, to keep them fixed (they're inductors, so their magnetic fields WILL interact, if they're in such close proximity).

That ribbon looks like it was MADE that way. If it got hot, all the traces wouldn't have and couldn't have warped quite like that. Plus there would be some darkening. That circular spot looks like it has some exposed copper - was it supposed to make contact with something, "on the way"?

[outlawz]

Re: Jensen Model Awm960

OK, thanks for your reply.

[kc8adu]

Re: Jensen Model Awm960

as already stated the ribbon is ok and the 2 chokes are too.thats a tuner module and not the problem on this dead set case.post pics of the rest of the board.

[ben7]

Re: Jensen Model Awm960

as already stated the ribbon is ok and the 2 chokes are too.thats a tuner module and not the problem on this dead set case.post pics of the rest of the board.

I second all of what kc8adu said.

[outlawz]

Re: Jensen Model Awm960

Here are some more pics. When I turn the radio on it will light up and shows clock and AM frequency but none of the buttons will work. It will not turn off or nothing. So maybe somebody can help me figure it out. I am going to put the chokes back in and do some more checking...Thanks.

[outlawz]

Re: Jensen Model Awm960

Here is all it does when powered up.

[outlawz]

Re: Jensen Model Awm960

Here is all it does when powered up.

Correction, that is the clock showing am. So the radio part is dead completely. But still cannot change the time with the buttons. No buttons at all work on it.

[outlawz]

Re: Jensen Model Awm960

Can anyone give me some advice as to why no power to buttons or no power to the radio. I have tried to get the schematics for it but they won't release them.In the first pic., top right. I have 12 volts up to that point. Maybe someone can tell me what to check next...Thanks

[budm]

Re: Jensen Model Awm960

Ae you getting 12V on both of these wires? Did it work before and it just quit?

[redwire]

Re: Jensen Model Awm960

Is that a melted PCB trace (GND?) on the left bottom (going to blk wire) ?

[outlawz]

Re: Jensen Model Awm960

Ae you getting 12V on both of these wires? Did it work before and it just quit?

I have went back and checked and yes I do have 12 Volts on those wires. It quit working when my brother had the radio in his camper. He sold the camper to my son. My son gave the radio to his sister-in-law to see what she could do with it. She cleaned the board and gave it back to him and it worked one day and then it quit again. It done the same thing.

[outlawz]

Re: Jensen Model Awm960

Is that a melted PCB trace (GND?) on the left bottom (going to blk wire) ?

I went and checked that trace. It is good. I even put solder over it to join the trace back together.

[outlawz]

Re: Jensen Model Awm960

Found the problem. Cold joint on diode...D8

[jloza]

Re: Jensen Model Awm960

iam sorta having the same problem . mine lites up but no numbers and nothing works just blue screen any suggestions ?
thanks

[ben7]

Re: Jensen Model Awm960

iam sorta having the same problem . mine lites up but no numbers and nothing works just blue screen any suggestions ?
thanks

Might be a bad solder joint somewhere else... check voltage regulators, and stuff like that... you might find, say, a 5V rail that is too low.

[Lawson5]

Re: Jensen Model Awm960

Can you tell me what you did to fix yours? Mine is doing the same thing.