Thread: Yaesu FT290
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Old 31st Jul 2021, 11:26 pm   #18
Terry_VK5TM's Avatar
Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 1,983
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, 37 views)
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