Yaesu ft 900 ham radio pll unlocks from 14.499 mhz to21.499 mhz i tried adjusting trimmer 3 no affect.

SOURCE: Yaesu FT 11R

figured out how to solve this, with the radio off, push and hold both up and down scan buttons, while powering the radio on. This will fix the problem.

SOURCE: YAESU HAM RADIO FT270R DIAGRAM

http://www.radioamateur.eu/schemi/FT270_sch.pdf

google is your friend

SOURCE: INTERCHANGE MODULE

I'm gonna go out on a limb here and assume you are talking about the band modules, right? If so it will accept some in the 6m,2m,and a couple of the 70cm bands. The model numbers I know it will accept are as follows: FEX-767-2,-6,-70A and -70B. If your module is one of these they are interchangeable. BTW, all of these modules are presently discontinued I'm sorry to say. Hope this helps!

SOURCE: yaesu ft 1500 m

Hi,

Here you can see the schematics http://www.repeater-builder.com/yaesu-vertex-standard/ft-1500/ft-1500m-sch.pdf

The manual can be found on the Yaesu website, http://www.yaesu.com/indexVS.cfm?cmd=DisplayProducts&ProdCatID=106&encProdID=92FB2363C1E0B9EBC9D3479054E0120B&DivisionID=65&isArchived=1

Good luck,
Gerard

SOURCE: My Yaesu ft-100 has a problem on the UHF band.

You have probably a faulty VHF/UHF relay. It is RL5016 in LPF unit.
73 JOSE EB5AGV