I have a PC122XL. Then problem I am having is, no transmit on AM or SSB. The radio recieves just fine. What should I check on it? I bought it for next to nothing, to see if I could get it fixed. There is also a small hole drilled in the case, in the front right corner. This makes me believe the radio was once modified.
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Uniden PC122XL no transmit
- Thread starter Seawolf18
- Start date
Here are some ideas and questions to help out....
In front of the finals there should be a shorting board, as long as it is in place then there should be voltage going to the finals. This is there to make the bias adjustment.
Keying up the radio near a second CB or receiver you should be able to detect some sort of signal. This would be so if the radio is transmitting but the final and/or driver is faulty, although the signal will be small and weak.
Do you have at least a volt meter handy and a jumper wire? The voltage should be 13.8 nominal at the PC jumper when it is place. Be careful not to short out the voltage to anything else.
Bypassing the final with the jumper wire you can energize the driver and then you can key up the radio but it will only be a weak signal out if the final is bad.
It is possible that the mic may be not switching the radio to transmit when you key the mic. Easiest way to check this is with a matching known good mic. Also check the PA function as this might indicate if the mic is doing it's thing.
You can manually key up the radio by jumping the mic connector on the radio to see if it keys the 122 up.
After all these simple tests you will narrow down the fault a bit more and you can begin to suspect the driver and/or final to be the fault. :headbang
Good luck on this..... mechanic
In front of the finals there should be a shorting board, as long as it is in place then there should be voltage going to the finals. This is there to make the bias adjustment.
Keying up the radio near a second CB or receiver you should be able to detect some sort of signal. This would be so if the radio is transmitting but the final and/or driver is faulty, although the signal will be small and weak.
Do you have at least a volt meter handy and a jumper wire? The voltage should be 13.8 nominal at the PC jumper when it is place. Be careful not to short out the voltage to anything else.
Bypassing the final with the jumper wire you can energize the driver and then you can key up the radio but it will only be a weak signal out if the final is bad.
It is possible that the mic may be not switching the radio to transmit when you key the mic. Easiest way to check this is with a matching known good mic. Also check the PA function as this might indicate if the mic is doing it's thing.
You can manually key up the radio by jumping the mic connector on the radio to see if it keys the 122 up.
After all these simple tests you will narrow down the fault a bit more and you can begin to suspect the driver and/or final to be the fault. :headbang
Good luck on this..... mechanic
radio parts side up , lid off , front of face upside down facing you . the back side right hand side tightly in the corner is a regulator on back of chassie , change it. 2.00 part (if that) if all else fails or before you do anything else.
here is a link to the pc122xl that will show you a lot on this radio and explains a lot. this was done up by a guy that lives in Michigan and knows this radio inside and out. hopefully this will help you see what may be wrong with your radio. the links at the top of the page will take you to more info on this radio. hopefully this will help you out.
Uniden PC-122 Miscellaneous Data Service Section How-To Manual
Uniden PC-122 Miscellaneous Data Service Section How-To Manual
there is a lot of repair info in all the reading . like I mentioned you can click on the links at the top for more info. I used that info to repair one I talk on now.
also these radios are prone to have bad solder joints also. I just received one I have not finished and hit all the joints that looked bad and got receive and transmit on the one I am working on.all it did was light up ther front when I 1st got it. on the bottom of the radio is a small metal shied which you can hit the solder joints in that area and may start coming back to life. that was the location I found most of them bad on mine.
also these radios are prone to have bad solder joints also. I just received one I have not finished and hit all the joints that looked bad and got receive and transmit on the one I am working on.all it did was light up ther front when I 1st got it. on the bottom of the radio is a small metal shied which you can hit the solder joints in that area and may start coming back to life. that was the location I found most of them bad on mine.
