Galaxy Melaka TX problems

[Radio Tech]

OK,
Had this radio come in a few weeks ago. It had a recieve problem. Signals would fade down but the hash (static) levels and s-meter would stay the same. Got that fixed. It has now came back with a TX problem.

Set radio to channel 20.
If you switch so ssb mode and key mic, I have a 10 watt carrier. If you modulate that it will swing to 11 watts.shows a frequency of 26.937mhz.
Switch to am.
Dead key is 2 watts and modulates to 10 watts.
Frequency 27.205 mhz.

So on ssb it is oscillating.

Voltage checks on driver and final in AM mode

--------B-----------C------------E
TR44
RX-----0.0--------5.56---------0.0
TX----1.16--------5.15---------0.03

TR43
RX-----0.00-------5.56---------0.00
TX-----0.53-------5.7----------0.03

Voltage checks on driver and final in SSB mode

--------B-----------C------------E

TR44
RX----0.0---------13.8----------0.0
TX----0.32--------11.71--------0.05

TR43
RX-----0.00------13.81----------0.00
TX-----0.59-------0.0-----------0.05

I have been using the DX-11 and DX 77 schematic to go through this radio.
In ssb you will notice that there is 0 volts in TX mode TR43 ? Dont think that is right.
According to voltage charts it should be 0.00 in RX and 13.0 in TX on collector.

I am about to pull my hair out with this beast.

Any ideas?

 

[Bionic Chicken]

Did you check the alignment of the PLL? Offsets and such? Key on SSB sounds like it is out of kilter.

BC

 

[Radio Tech]

Oh yea, Did a complete alignment check on it.

Guess you asked that because of ssb frequency being off? If so I think that is because of the final is going into oscillating.

 

[Bionic Chicken]

But the osc and ref freqs are stable when this is going on?

 

[Radio Tech]

Solid as a rock.
Trying to hunt down where my 13 volts is at on TX.

 

[Radio Tech]

Heres a thought for ya.
I replaced IC4 when I was working on the RX section a while back. I just replaced it again and the radio worked fine. No carrier on ssb. Tried 3 times and was fine. The fourth time I keyed the mic, there was a carrier.
So I am off now to find voltage checkes for IC 4. Maybe there is something there that is taking out part of it.