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C101 and J64 checks out fine. Replaced C101 anyway. Changed the PLL and that was not the problem. Check all the diode matrix and checks out fine. TR30 checked out fine. There is no Tr31 or Tr33 in this radio. Checked Tr34 it is fine. Changed both Arrays just for the heck of it and they are fine...

Traced all grounds and all check out good. No I have not done any work on C101 or J64 but I will check them tomorrow when I get back in the shop. I have to head out to my 2nd job now so will report back tomorrow when I get back on this nightmare. Thanks again for your help and hope you have a...

Yes this selector is a EPT360022Z that is different from the one you posted.

Forgot to add I did ohm all the wires the selector to make sure there was no break or funny stuff going on and they tested fine. Now on to testing all these grounding spots. Will report back soon!

I just swapped the channel selector with the good one and left it inline as the old one has some digits out. Ok let me get busy running through all this grounding you spoke of and I will report back. Thanks again for taking the time to help me on this. I am about ready to pitch in it in the...

Checked voltages against a working radio and both match the same with each other.

Both Arrays are factory and never been touched. I have checked the voltages against a working radio and both check out the same voltage on both radios. Both radios are the same exact radio so I have something to go by.

Yes the channel display stays on the correct channel you put it on so that does not change. I will have to pick back up on this tomorrow as I have to go to my 2nd job now so it will be tomorrow before I can get back with on this problem with you. I want to thank you very much for all the help...

Andy, I have checked the band switch and everything looks good wire wise. The hi - low switch worked but done this. Lets stick with channel 20 on D/A band normal on hi. Turn radio on and key up 27.205 like it should be. Flip to low band and we have 25.855 like it should be. Flip back to hi and...

We can rule out IC7. Changed it out and still has the same problem. Moving on to the next step.

Yes Sir Mr. Andy the radio works fine until you change channels. Once you change the channel it will jump up into the E band frequency and stay there until you turn the power off and back on. Once powered off and back on it will be locked onto the channel you are on but once you change the...

Hey Sonoma, Long time no hear buddy. Hope all has been going well over your way? Done been through the circuit for cold solder joints. There is nothing you can do to make this radio come back to the correct frequency you know like pushing around on the board or moving parts around. Nothing...

As stated in the topic title it is a connex 3300 HP but did not add the board # EPT360014B Done ruled out the channel selector as I changed it out with a known good working one.

Hey guys, I have a connex on the bench that has a problem that I have never seen before. Lets say your on channel 20 = 27.205 when you change the channel to say 24 the frequency jumps to 27.415 and will not change to the correct frequency until you turn the power off and back on then everything...

Don't recall off the top of my head.

Sure did.

TR24 was the culprit

This one is off both TX & RX. I will check tr33 out to see if it helps. Thanks for the heads up!

Sure would have been nice to see the answer to this one as I have one doing the same exact same thing.

711, Your advice was great and put me in the right direction. After talking to a friend on the phone that had worked on these type of radio's before and swore off ever taking another one in his shop for repair told me what to look for and once I found the area giving me the problem from not...