Thread: Yaesu FT290
View Single Post
Old 31st Jul 2021, 11:26 pm   #18
Terry_VK5TM
Octode
 
Terry_VK5TM's Avatar
 
Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 1,745
Default Re: Yaesu FT290

Can you reach pin 10 of connector J02 on the CPU board?

Is the voltage varying somewhere between 0 & 5V when you tune?

The 131.19 frequency should vary as you tune - this does not come from the PLL chip but from the CPU.

Attached pdf is block diagram with the PLL and frequencies you are seeing lower left - sounds like Q3004 is not mixing.

You'll need to zoom to about 400% to see it clearly.
Attached Files
File Type: pdf FT290 PLL.pdf (39.3 KB, 27 views)
__________________
Terry VK5TM
https://www.vk5tm.com/
Terry_VK5TM is offline   Reply With Quote