Thanks Yves,
I checked the operation of frequency counter on external input signal. The frequency counter indeed shows the correct input frequency feed into the external clock input.
This points that either YIG or somewhere near YIG has problem. The frequency error is not minor, for an example, if I set internal clock to112.5MHz, I measure the clock 103.5Mhz and the output frequency stays same (103.5Mhz) even I set the clock to 124Mhz, It seems that in some bands the YIG frequency is both incorrect and not responding to the requested frequency changes.
But in some band (e,g, from 80.7Mhz to 112.4 Mhz), the output frequency is both correct and stable.
I ordered a used timing board from ebay, I hope i can harvest the YIG if it is still functional. wish me a luck.
My unit does not show any other error than E008 (frequency counter error) So I strongly suspect, frequency counter is working OK but output if frequency counter is not correct, throwing error, and because input of the frequency counter is not correct.
I looked into the Channel 1 RF relay, I think we can replace with equivalent part or may be I can open it and have a look, I plan to do it when I open the unit to debug the YIG issue. I will keep you posted.
And Indeed its very difficult to open the unit to have access to the timing board, Its tons of screws :)
Thanks!
