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Cobra 139 LXR Capacitor question?

L

long night

Active Member
Jan 8, 2020
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Hi to all. Can someone tell me which way the C-304 capacitor faces so I can install it with correct polarity. My radio has this capacitor missing so I have no guide.

Thanks to all Long Night
 

Hopefully this might give you some help.
If you look right between C304 and R305 there is a tiny little white '+' symbol.

That would suggest to me that the C304 pads are "side to side" (where R305's pads are vertical in this image, I am thinking that C304's pads would be there horizontally) and the one closest TO the resistor would be positive terminal of C304 and the other would be negative.

It would be prudent though to do a little pad/trace exploration.....
139XLR_C304.png

In this next snippet..... the POSITIVE side of C304.....connects RIGHT OVER to one of the ends of R305. You should be able to see that on the back side of the Power Supply PCB. If that pad with the + runs over to the resistor R305....Bingo! That is the positive pad for C304.

Schemo.png

Good luck.... let me know!
 
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guitar_199 said:
Hopefully this might give you some help.
If you look right between C304 and R305 there is a tiny little white '+' symbol.

That would suggest to me that the C304 pads are "side to side" (where R305's pads are vertical in this image, I am thinking that C304's pads would be there horizontally) and the one closest TO the resistor would be positive terminal of C304 and the other would be negative.

It would be prudent though to do a little pad/trace exploration.....
View attachment 45636

In this next snippet..... the POSITIVE side of C304.....connects RIGHT OVER to one of the ends of R305. You should be able to see that on the back side of the Power Supply PCB. If that pad with the + runs over to the resistor R305....Bingo! That is the positive pad for C304.

View attachment 45637

Good luck.... let me know!
Click to expand...
Got
guitar_199 said:
Hopefully this might give you some help.
If you look right between C304 and R305 there is a tiny little white '+' symbol.

That would suggest to me that the C304 pads are "side to side" (where R305's pads are vertical in this image, I am thinking that C304's pads would be there horizontally) and the one closest TO the resistor would be positive terminal of C304 and the other would be negative.

It would be prudent though to do a little pad/trace exploration.....
View attachment 45636

In this next snippet..... the POSITIVE side of C304.....connects RIGHT OVER to one of the ends of R305. You should be able to see that on the back side of the Power Supply PCB. If that pad with the + runs over to the resistor R305....Bingo! That is the positive pad for C304.

View attachment 45637

Good luck.... let me know!
Click to expand...
guitar_199 said:
Hopefully this might give you some help.
If you look right between C304 and R305 there is a tiny little white '+' symbol.

That would suggest to me that the C304 pads are "side to side" (where R305's pads are vertical in this image, I am thinking that C304's pads would be there horizontally) and the one closest TO the resistor would be positive terminal of C304 and the other would be negative.

It would be prudent though to do a little pad/trace exploration.....
View attachment 45636

In this next snippet..... the POSITIVE side of C304.....connects RIGHT OVER to one of the ends of R305. You should be able to see that on the back side of the Power Supply PCB. If that pad with the + runs over to the resistor R305....Bingo! That is the positive pad for C304.

View attachment 45637

Good luck.... let me know!
Click to expand...
guitar_199 said:
Hopefully this might give you some help.
If you look right between C304 and R305 there is a tiny little white '+' symbol.

That would suggest to me that the C304 pads are "side to side" (where R305's pads are vertical in this image, I am thinking that C304's pads would be there horizontally) and the one closest TO the resistor would be positive terminal of C304 and the other would be negative.

It would be prudent though to do a little pad/trace exploration.....
View attachment 45636

In this next snippet..... the POSITIVE side of C304.....connects RIGHT OVER to one of the ends of R305. You should be able to see that on the back side of the Power Supply PCB. If that pad with the + runs over to the resistor R305....Bingo! That is the positive pad for C304.

View attachment 45637

Good luck.... let me know!
Click to expand...
Got it. Thanks for your help!!
 
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