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cobra 29 audio IC
- Thread starter Number15
- Start date
lords
Active Member
The new 29's use a different chip than the 7222 (I'm not sure the exact date this changed, sometime late last year I believe). IIRC it's something like YD1022 (not sure of the number, I can check Monday when I get to the shop). It is an altogether different chip, and currently there is little info on the net about it. Only source I have found for them is Cobra.
Thanks guys, Lords the radio has no recieve and the PA works fine with a external speaker so i got TX no RX ? and needle does not move ?
15 ? Your audio will work fine through your PA speaker as long as your audio chip is working (it's working), no needle movement (RX as you put it) sounds more like you have a power problem 
Where did this radio come from ? it could have been hooked up backwards without a fuse inline and the pertect diode could be blown ? Could also be the final and driver are gonzo as well ? , check the diode right below the power connector in the radio on the board , good chance you would see one fried up if that were the case (not always , but most of the time) you would need to change that if it is . If you take the burnt diode out of line and the radio now TX's that was your problem (it will work out of line but not the best of ideas to leave it that way , best to replace the diode) if that's not your problem I would now look at the final and driver , most of the time it's just the final went bad (bad SWR's will cause this on many a radio) but it's best to change both final and driver if you can ,
Where did this radio come from ? it could have been hooked up backwards without a fuse inline and the pertect diode could be blown ? Could also be the final and driver are gonzo as well ? , check the diode right below the power connector in the radio on the board , good chance you would see one fried up if that were the case (not always , but most of the time) you would need to change that if it is . If you take the burnt diode out of line and the radio now TX's that was your problem (it will work out of line but not the best of ideas to leave it that way , best to replace the diode) if that's not your problem I would now look at the final and driver , most of the time it's just the final went bad (bad SWR's will cause this on many a radio) but it's best to change both final and driver if you can ,RF PARTS had the hard to find one I needed www.rfparts.com but as said like my radio if your PA and transmit works its not your audio chip as I learned after replacing mine.
yea i think the IC is good and i replaced the final, just need to replace the driver anyone know were to buy one ????
lords
Active Member
if that is a LTD check TR6 TR7 <for receive and no it wouldn't be that diode if it was it be popping fuses if it was hooked up wrong.....till you cut the diode to bypass it to see if it was the cause of a blown fuse
See the problem with radios is the transmit section is way easier to detect something wrong quicker,compared to the receive section
so check all resisters,transistors,diodes within TR6 and TR7 as you have as you said no meter movement is there any sound besides the no meter movement...did you check pin 4 from the mic input for receive?
good luck.
See the problem with radios is the transmit section is way easier to detect something wrong quicker,compared to the receive section
so check all resisters,transistors,diodes within TR6 and TR7 as you have as you said no meter movement is there any sound besides the no meter movement...did you check pin 4 from the mic input for receive?
good luck.
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