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Hi when I need help, a thread like this would have been useful. There has also been endless Emails with regards RS232 interfaces! Ok I will not reply to the group in the future 73 Andrew Get Outlook

Andrew, Is it possible D3036 is open? If I am getting output on the VHF side, then the TX IF signal must be present at the anode side of D3035 and D3036. I've verified Q3014 is switching correctly,

Next up I'll be checking for 8V on TX at the following points: J3015 pin 7 (UT8) J3016 pin 3 (UT8) J3011 pin 1 (UHF T8)

The opening line to the opening page is " This site exists for the exchange of ideas, advice, technical and general information for the Yaesu Transceiver known as the FT-847." I would suggest if you

Also checked these voltages and all were good

Hi All, Fantastic thread, have been following every exchange, looking forward to the result. Have a non Modded FT847 good luck guys ‘73 Paul

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I see no reason why it should be off line. A worthwhile exercise in

That's great Max, I hope it reaches a resolution.

Not a problem Ian. I thought others would benefit from the exercise. Sorry to have bothered the group. I'll continue the repair through private messaging. If any other members might be interested in

This is a bit like a "death by a thousand cuts". Any chance you could go off-line?

In that case Q3007 is fine, you need to trace back and find your signal from the RF board, it will be an UHF osc out of luck! Is my guess or a LO to mix up to UHF let me study further 73

On Q3011 (VHF) I get 313mV on pin 1, 1.4V on pin 5 On Q3007 (UHF) nothing on either pin 1 or 5

Phew, have you checked the I/P pin 1, and compared it with Pin 1 on the VHF side, I am guessing they should be similar! 73 Andrew Sent: 19 July 2022 11:48 To: [email protected] Subject:

Hi Andy, Sorry meant Q3011.

Hi do you mean: Q3007? What is pin 1 of the UPC1677Cs’ I have not found Q3006! 73 Andrew Sent: 19 July 2022 11:04 To: [email protected] Subject: Re: [YaesuFT847]

Based on the comparison reasons against its VHF counterpart, I still think Q3007 is bad. I have a couple on the way but won't be here for a week or so.

That is good news Get Outlook for Android

Q3007 temporarily hits about 1.1V out on pin 5 but then drops down to the 20mV range

Andy, TP3009 is 5V on RX goes low <0.5V on TX UHF TP3010 does the same on VHF Q3007 pin 8 (KEY)? 0V on RX 4.05V on TX