Uniden PC122XL

[Chosenbc]

So I bought a PC122XL and it turns on, changes channels, and with the volume up I hear static, but that's about all it does. I connected my brand new Galaxy DX959 mic to the unit, and it does not transmit or receive. It is not keying up, and when put next to my DX959 and I transmit on that unit, it does not receive anything on the pc122xl. I have done the opposite, but again no transmit. I have pulled it apart, and fixed some bad solder joints, but I totally at a loss as where to start. I checked all the diodes, resistors, and caps on the small pcb board that has the volume, squelch, rf gain, and clarifier pots on it and they are all fine. But I am new to the CB world and am willing to take the time and challenge of trying to repair this mini-beast to its former glory. Please help if you may.

Thanks!

 

[wd586]

pc-122xl

Check for voltage on driver and final, make sure vco is locking......link is for pc-122 might help you...Uniden PC122

 

[Robb]

I agree with the last post.
But I would start with the voltage regulator first and work outwards from there.
Then the audio chip next.

 

[ExitThirteen]

Check L13, that is the VCO. If you adjust it a touch and she comes in, you're good. You may also have to adjust L38 also, which "triples" the 5.12 mhz signal off the PLL. If L38 is out of adjustment, that can also cause it to not TX or RX. Provided the radio hasn't been hacked into, it could be either one (or both) of those cans. Good luck!


~Cheers~

(edit) L13 will have a blob of wax over the hole. Be careful when you pull the wax out of the hole so you don't crack the slug inside.
L13 will be left center of the radio. L38 will be just left of the PLL chip labelled D2824C.