it was a manner of time to make my first fault and trying to fix it now.
Please im asking for your help, because generators are little complicated for my knowledge. Where to focus to find50khz my fault, here are the results, i have recapped the 50khz oscillator, reference board, frequency converter and phase control, didnt touch the other modules. Have checked the tantalum capacitors for polarity, and the only fault known that i cant find, in the phase control board, there are four 1mf capacitors under the board, on the tracks side, one of them maybe cold solder, fall off and i cant find where it was was.
Now the generator power on, everything on the front panel works, output and attenuator works, modulation works, i can change frequency from the buttons and see it on the screen BUT the frequency is unchanged on the output. There is a standar frequency around 66-66Mhz and is unchanged. it is locked there. I can add modulation to this frequency and adjust the output but not the frequency!!
In the photo is the output on the oscilloscope
PLEASE give me some help where to start and search, as i sayed the only fault that i can found now is a 1uf tantalum capacitor that is under the phase control, on the track side and i cant find its position, but can made all this mess??
Thank you
George