Ok, that Takes us a little further.
Got a Main PCB board number?
You said DX, it narrows it down - and now people who read this for future reference - it may help those that are trying to help the poster, if and what - they are up against - any identification that narrows down the type of radio not just a "2950" or 99VHP - but board number - as you go thru this you'll see why.
Ok, the DX comes in several flavors - with MOSFET's served insides; so you know...
One board uses the TA7222P chip which has it's own Mute pin...
Another board uses the TA7003 5 pin chip with it's own pinout issues...
Another board also uses MOSFET...
So, on we go...
Look for D63, its' the TX trimmer from the main PCB...that goes to the CPU board.
Does your radios' front panel look like this?
They again, use this setup - main PCB communicates to the CPU - the CPU then updates display and tells PLL to SHIFT in the direction you rotate the VFO knob..but main determination for frequency is still thru V8 TX adj, and FINE Clarifier trim on front panel for RX - all branched thru J28 and two steering diodes, D63 and D41 - with VR 8 "adjusting" for TX tracking side.
Again, back to the main PCB - locate the Fine control header J28 - that is the RX side of the VCO fine tune adjust trimmer branch that goes to VCO and Varactor diode.
IF they did any mods they may have damaged the Clarifier Pot, TX Trim VR 8 Pot or J28 - look for and correct the mods, any work really including up at the Clarifier board behind the front panel - back to stock to regain center and proper Clarifier control.
IF they did what I think they did, then this section right next to it - is damaged or potential failure in it somewhere..if you cannote restore the Clarifier after getting J28 working right...again - it acts like you "lost your RX control" because the VCO is running off the VFO display - which isn't right, but it functions because the CPU seems to be still working - the VCO from the main PCB to balance it, may be out - your side, is not working.
From Rick Jackson and Euro Radio Co...CB Tricks...
Remember too, that if a mod was done and they APPLIED more than 8 volts - to this section - you may have a cascaded failure of the VCO and Varactor area by VC2 - right next to this section. Meaning they killed the ENTIRE thing and you're running straight off the VFO front knob. It may explain your "Offset".
The above "schematic snippet" is from CB Tricks and Euro Radio - and note the PLL is similar to the 145106 but now...its SERIAL DATA programmed - so it no longer has parallel pin programming like BCD - it's CPU controlled programming now - so again, the main PCB communicates to the CPU and CPU controls the PLL and you handle the OFFSET VCO - as shown above.
:+> Andy <+:
EDIT: Revised SMD