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Would like to know if anyone would have the answer to this.
I just purchased a FT-736R however after a few minutes to an hour if I am on 432.144 the frequency will drop down to 432.109 and stay there. When I change the frequency with the VFO it will not move until I cycle the VFO and when it does move it moves in 29khz increments. The VFO indicates that it is changing frequency normally (the readout moves) but is in fact not.
The 2 meter side is good,output,on frequency etc. , the other noted fact is that when initiated the 440 module is 1.5khz low, now could this be a catastrophic failure occurring in the PLL board or is there something else I should be looking for.Or maybe it would make a good paper weight? Tapping on various components on the boards does not reveal any mechanical faults.
Any ideas from the Yaesu experts out there???
Hi Glenn
I'm no expert on FT 736 but it almost sounds like a Cap breakdown is causing your 35 KC freq drop or a cold solder joint,as it only occurs in UHF modeIt might be worth a call to Yaesu tech support in LA and pick theit brains.
Good Luck & 73 4 Now
Paul KB3LMV
Hi Paul, thanks for the advice.
Upon further checking it is not the RF unit, what is causing the problem is the PLL is unlocking. I had the board out and it appears that one section is bad, or the components in that area are weak.
I have changed out the RF unit for a ¨New¨one and the problem still persists. It is however NOT the same problem as you would encounter in the 2 meter side when the cap is bad.
I have a PLL board on the way and will change that out.
Found that it was the PLL board that was bad. Replaced it with another and the radio is perfect.
The symptoms were the same as on the 2 meter side posted in another site, however after changing caps,and such it turns out to be the PLL. What part exactly I don´t know,perhaps a chip??
Found that it was the PLL board that was bad. Replaced it with another and the radio is perfect.