Might find this useful ? 
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From: [email protected] [mailto:[email protected]] On Behalf Of Suryono Adisoemarta via groups.io
Sent: 03 August 2022 09:44
To: [email protected]
Subject: Re: [YaesuFT847] No power on SSB? Andrew, thanks for the response. AM (and FM) works fine, only on SSB I got nothing. I just pried open the box and starting doing the audio tracing. On Wednesday, August 3, 2022 at 03:00:20 PM GMT+7, Andrew Lenton <a@...> wrote: I have had this I will get back to you, I presume AM is dead too? ? ? I need help as I have no power on SSB (all bands), whereas FM is fine, whenever I transmit on my FT-847. Receiving SSB signal is fine. I've confirmed this problem on a watt meter to a dummy load. Is there a relay to change modulation mode that might be stuck ? ?
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Audio tracing will not work as the pre amp uses current mirrors, so very little to see, as AM works, the 2nd TX mixer is locked, so check around the SSB filters with a scope for the SSB signal. ? It would not hurt to do the following ? 
? 73 ? Andrew ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Suryono Adisoemarta via groups.io
Sent: 03 August 2022 09:44
To: [email protected]
Subject: Re: [YaesuFT847] No power on SSB? Andrew, thanks for the response. AM (and FM) works fine, only on SSB I got nothing. I just pried open the box and starting doing the audio tracing. On Wednesday, August 3, 2022 at 03:00:20 PM GMT+7, Andrew Lenton <a@...> wrote: I have had this I will get back to you, I presume AM is dead too? ? ? I need help as I have no power on SSB (all bands), whereas FM is fine, whenever I transmit on my FT-847. Receiving SSB signal is fine. I've confirmed this problem on a watt meter to a dummy load. Is there a relay to change modulation mode that might be stuck ? ?
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Andrew, thanks for the response.
AM (and FM) works fine, only on SSB I got nothing. I just pried open the box and starting doing the audio tracing.
73 de Yono - YD0NXX
On Wednesday, August 3, 2022 at 03:00:20 PM GMT+7, Andrew Lenton <a@...> wrote:
I have had this I will get back to you, I presume AM is dead too? ?
From: [email protected] [mailto:[email protected]] On Behalf Of Suryono Adisoemarta via groups.io
Sent: 03 August 2022 02:28
To: [email protected]
Subject: [YaesuFT847] No power on SSB ? I need help as I have no power on SSB (all bands), whereas FM is fine, whenever I transmit on my FT-847. Receiving SSB signal is fine. I've confirmed this problem on a watt meter to a dummy load. Is there a relay to change modulation mode that might be stuck ? ?
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I have had this I will get back to you, I presume AM is dead too? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Suryono Adisoemarta via groups.io
Sent: 03 August 2022 02:28
To: [email protected]
Subject: [YaesuFT847] No power on SSB? I need help as I have no power on SSB (all bands), whereas FM is fine, whenever I transmit on my FT-847. Receiving SSB signal is fine. I've confirmed this problem on a watt meter to a dummy load. Is there a relay to change modulation mode that might be stuck ? ?
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I need help as I have no power on SSB (all bands), whereas FM is fine, whenever I transmit on my FT-847.
Receiving SSB signal is fine.
I've confirmed this problem on a watt meter to a dummy load.
Is there a relay to change modulation mode that might be stuck ?
73 de Yono - YD0NXX
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Looking for outer trim piece
If anyone has an FT847 they are parting out, I am looking for the outer trim piece?from the unit.? Mine?arrived cracked during shipping.
Thank you for looking
Kent K9EZ
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I see this connector in the back of the faceplace, it is not connected to anything. What it is function?
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If you have a working FT847
Hi As I no longer have an FT847 if anyone gets the chance, can they measure what they get on the following: ? MD2003 Pin3 MD2004 Pin 3, base of Q2014, collector of Q2014, ?Base of Q 2022, Collector Q2022 and Q2031 on UHF TX and RX ? Just need relative levels into a Spectrum Analyser, a small nano Spectrum Analyser. ? Next time you take your rig apart, or have nothing else better to do! ? 73 ? Andrew G8UUG ? ? 
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Does anyone have one of those rigs? I cant get it to works on 60m and 27Mhz. Have tried the options found searching and nothing. It was purchased in Japan.
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I have tried 111010, nothing.
I have a japanese model, I'd like to use 11m band. Gives me error. Any help?
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Re: If low at O/P then trace back D2016 switching?
That does not make sense, unless the UHF is banded 410 to 439 and 440 to 470 ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Max Donoghue
Sent: 23 July 2022 14:55
To: Andrew Lenton
Cc: [email protected]
Subject: Re: [YaesuFT847] If low at O/P then trace back D2016 switching? ? On Sat, Jul 23, 2022 at 6:03 AM Andrew Lenton <a@...> wrote: Hi the SAT button on and off a few times!
? Hitting the SAT button lights up all the buttons for sat operation. Do hear anything click, but not sure if I am supposed to. ? Check Q2017 is switching as this will kill off the UHF RX and TX LO this should be working as RX is working can you confirm this, tx on a hand held or signal generator
RX is working, confirmed by handheld ? D2017 the anodes of the diodes are switched separately for TX and RX, confirm the LO is on cathode of D2016, then follow the LO through the circuit path to the TX LO O/P via Q2039 ?
?
? OK TP 4 to TP 7, is the supply to the VCO, pulled on by a PNP transistor in Q2015 to 18. ? OK we have VHF 1 + 2 and UHF 1 + 2, and 4 VCO, I suspect two are for TX and the other two for the RX VCO as they will probably be different frequencies! Or slit frequency operation (not sure here) or when TX and RX are used simultaneously in SAT mode? ?
73 ? Andrew ? From: Max Donoghue [mailto:ve3tmt@...]
Sent: 22 July 2022 19:34
To: Andrew
Subject: Re: If low at O/P then trace back D2016 switching? ? Went digging into the PLL board. I'm getting 3.66V at TP2003 in TX D2019 is switching as expected, one line high for HF, one for VHF and one for UHF. All three lines tested fine.On the underside of the PLL board, I am getting 7.9V on TP2006, but not TP2007 which leads to Q2018. On UHF I'm getting 7.9V on pin 2 of Q2017 but nothing on pin 2 of Q2018 check if there is something there on RX On VHF I'm getting 7.9V on pin 2 of Q2016 but nothing on pin 2 of Q2015 check if there is something there on RX ? On Fri, Jul 22, 2022 at 1:29 PM Max Donoghue <ve3tmt@...> wrote: Correction to my earlier results, TX IF signal is present on all bands.? TX LO signal is present on all bands except 440. No output there. ? On Fri, Jul 22, 2022 at 7:55 AM Max Donoghue <ve3tmt@...> wrote: No worries I appreciate all the help. ? On Fri, Jul 22, 2022, 7:51 AM Andrew <a@...> wrote: Interesting? ok I am away from home in Torquay, I have limited access to circuits? however? we are nearly there.
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Re: If low at O/P then trace back D2016 switching?
GO on pin 3 or the collector of Q2014, there should be a healthy signal there on RX as it is working! And on TX the seam level but a different frequency ? 73 ? Andrew ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Max Donoghue
Sent: 24 July 2022 01:25
To: [email protected]
Subject: Re: [YaesuFT847] If low at O/P then trace back D2016 switching? ? Am I making the correct measurements? ? On Sat, Jul 23, 2022, 6:48 PM Andrew Lenton <a@...> wrote: Seems odd the voltages are good on the VF0 control voltage pin! There is not much to go wrong on a VCO I will see if I can find one!
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Re: If low at O/P then trace back D2016 switching?
Dear Max, ? Take a look below: ? The UHF path to the LO output is slightly different to VHF so from D2018 it is the same, Q2022 is unique for UHF ? Bottom line: ? there is switched power on MD2003 or MD2004 Pin 4 ?there should be and o/p on Pin 3, I cannot believe both are dead! One may be. Recheck pin 3 go on the pins ? R2042 and R2047 33R check those resistors ? In our first comms, I thought you said you hand held could pick the UHF signal when on TX, is this correct, this implies all is well apart from the TX PA chain? So a bit confused here, has a plug pulled out somewhere ? VTB is the switching to D2017 ? ? 
? 
?
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From: [email protected] [mailto:[email protected]] On Behalf Of Max Donoghue
Sent: 23 July 2022 14:55
To: Andrew Lenton
Cc: [email protected]
Subject: Re: [YaesuFT847] If low at O/P then trace back D2016 switching? ? On Sat, Jul 23, 2022 at 6:03 AM Andrew Lenton <a@...> wrote: Hi the SAT button on and off a few times!
? Hitting the SAT button lights up all the buttons for sat operation. Do hear anything click, but not sure if I am supposed to. ? Check Q2017 is switching as this will kill off the UHF RX and TX LO this should be working as RX is working can you confirm this, tx on a hand held or signal generator
RX is working, confirmed by handheld ? D2017 the anodes of the diodes are switched separately for TX and RX, confirm the LO is on cathode of D2016, then follow the LO through the circuit path to the TX LO O/P via Q2039 ?
?
? OK TP 4 to TP 7, is the supply to the VCO, pulled on by a PNP transistor in Q2015 to 18. ? OK we have VHF 1 + 2 and UHF 1 + 2, and 4 VCO, I suspect two are for TX and the other two for the RX VCO as they will probably be different frequencies! Or slit frequency operation (not sure here) or when TX and RX are used simultaneously in SAT mode? ?
73 ? Andrew ? From: Max Donoghue [mailto:ve3tmt@...]
Sent: 22 July 2022 19:34
To: Andrew
Subject: Re: If low at O/P then trace back D2016 switching? ? Went digging into the PLL board. I'm getting 3.66V at TP2003 in TX D2019 is switching as expected, one line high for HF, one for VHF and one for UHF. All three lines tested fine.On the underside of the PLL board, I am getting 7.9V on TP2006, but not TP2007 which leads to Q2018. On UHF I'm getting 7.9V on pin 2 of Q2017 but nothing on pin 2 of Q2018 check if there is something there on RX On VHF I'm getting 7.9V on pin 2 of Q2016 but nothing on pin 2 of Q2015 check if there is something there on RX ? On Fri, Jul 22, 2022 at 1:29 PM Max Donoghue <ve3tmt@...> wrote: Correction to my earlier results, TX IF signal is present on all bands.? TX LO signal is present on all bands except 440. No output there. ? On Fri, Jul 22, 2022 at 7:55 AM Max Donoghue <ve3tmt@...> wrote: No worries I appreciate all the help. ? On Fri, Jul 22, 2022, 7:51 AM Andrew <a@...> wrote: Interesting? ok I am away from home in Torquay, I have limited access to circuits? however? we are nearly there.
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Re: If low at O/P then trace back D2016 switching?
I do not believe in two faults, the VCO assuming it is a VCO, might me fixed frequency and the if moves to change frequency.
Check 8 V on both VCO, tx rx, the check the o/p, tx and rx share a path, this is the likely area for a fault, however, the two UHF VCO also share a reference, and if this is missing or out of lock, an inhibit will come into play. Let me study further
73
Andrew
Get
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Re: If low at O/P then trace back D2016 switching?
Am I making the correct measurements?
On Sat, Jul 23, 2022, 6:48 PM Andrew Lenton < a@...> wrote: Seems odd the voltages are good on the VF0 control voltage pin!
There is not much to go wrong on a VCO I will see if I can find one!
Get
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Re: If low at O/P then trace back D2016 switching?
Seems odd the voltages are good on the VF0 control voltage pin!
There is not much to go wrong on a VCO I will see if I can find one!
Get
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Re: If low at O/P then trace back D2016 switching?
I'll button it up for now so I can get back to using it and look for a PLL board to replace. Would probably be the easiest remedy.
On Sat, Jul 23, 2022, 6:13 PM Andrew Lenton < a@...> wrote:
Sorry did not spot the attachments check directly on the the UHF TX VCO
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Does UHF RX work, judging by your measurements, I would say no.
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VHF frequency of 190 Mhz was unsepected, so the LO is high
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Looks like the UHF VCO has died!
?
Get
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Re: If low at O/P then trace back D2016 switching?
Sorry did not spot the attachments check directly on the the UHF TX VCO
Does UHF RX work, judging by your measurements, I would say no.
VHF frequency of 190 Mhz was unsepected, so the LO is high
Looks like the UHF VCO has died!
Get
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Re: If low at O/P then trace back D2016 switching?
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Andrew Lenton
