7-26-2024 Update RE: [YaesuFT847] FT-847 only transmitting on FM mode. de: W1SMS
Andrew, Good morning – I am finally getting back to my FT-847 troubleshooting. ? Yesterday, I performed the test of TP1003 and adjustment of T1009. ? I found that there is a maximum voltage of 0.572 which varies by adjusting T1009. Note that this voltage is present in RX or in TX (CW) – it just remains steady. ? So, what is the next step ? ? Thanks and 73, Steve ? W1SMS Steven M. Simons ? ?
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From: [email protected] <[email protected]> On Behalf Of Andrew Lenton
Sent: Wednesday, October 11, 2023 5:25 PM
To: [email protected]
Subject: Re: [YaesuFT847] FT-847 only transmitting on FM mode. de: W1SMS? On 10 Oct 2023, at 21:14, Steven Simons <ssimons@...> wrote: Andrew,
Nice to meet you and thanks for the repair tips.
I do have a copy of the service manual - which I plan on reviewing prior to performing any adjustments.
I'll probe the test points you refer to and see what I find.
"stay tuned"....
de: W1SMS
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Hi there are a number of simple alignment steps, where the test point are peaked even with out much test equipment you can do around 80% ? Q1024 is a VCO locked to X1001 the component drifts over the years. ? I have known hams that when doing an alignment, accidently, move the wrong coil so make sure you find T1009 as it has many neighbours. There are manuals on this forum you can down load ? 73 ? Andrew ? 
?
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From: [email protected] <[email protected]> On Behalf Of Wayne Carpenter KN2Z @minicowman via groups.io
Sent: 24 July 2024 14:23
To: [email protected]
Subject: Re: [YaesuFT847] No TX or RX? On Tue, Jul 23, 2024 at 03:34 PM, Andrew Lenton wrote: Failing that go through all the alignment.
Thanks Andrew!? I will give the voltage check a try. Sounds easy enough.?? I don't know about an alignment though. I have a user manual and schematics that I downloaded but I don't have anything like an advanced or service manual so no alignment instructions.? I have a recently calibrated HP signal generator, an Agilent spectrum analyzer and a couple of scopes that do well enough for HF band work (one's a 25MHz and the other is a 50) but doing an alignment on one of these vs an old National or Hallicrafters seems a bit daunting without proper instruction. But I will try what you've suggested. I really want to help the guy out. He's always doing stuff for others and volunteers in the community all the time. It would be nice to give back now and then.
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Wayne Carpenter KN2Z @minicowman
On Tue, Jul 23, 2024 at 03:34 PM, Andrew Lenton wrote:
Failing that go through all the alignment.
Thanks Andrew!? I will give the voltage check a try. Sounds easy enough.??
?
I don't know about an alignment though. I have a user manual and schematics that I downloaded but I don't have anything like an advanced or service manual so no alignment instructions.? I have a recently calibrated HP signal generator, an Agilent spectrum analyzer and a couple of scopes that do well enough for HF band work (one's a 25MHz and the other is a 50) but doing an alignment on one of these vs an old National or Hallicrafters seems a bit daunting without proper instruction.
?
But I will try what you've suggested. I really want to help the guy out. He's always doing stuff for others and volunteers in the community all the time. It would be nice to give back now and then.
|
Try this: ? 
? Failing that go through all the alignment. ? 73 ? Andrew ? 
?
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From: [email protected] <[email protected]> On Behalf Of Andy Bosworth
Sent: 23 July 2024 19:08
To: [email protected]
Subject: Re: [YaesuFT847] No TX or RX? Is there any RX on FM with a known signal? ? On Tue, 23 Jul 2024, 18:44 Wayne Carpenter KN2Z @minicowman via , <mwcarpe=[email protected]> wrote: Howdy.? First off, I'm a vintage radio tech.. tubes (valves?) are my favorite things to work on. However, I have a friend & neighbor that has an FT-847 that he asked me to take a look at. Here's what I found as far as symptoms: 1. No AM at all. No TX, no RX, no reaction to PTT. Dead silent.
2. Radio is deaf on all bands. Zero receive. There is static but broadcasting a +3db signal in my shack (via my HP 8656B generator on each of the modes the radio can do, zero signal detected. At +3db, neighbors a block away should pick it up.)
3. No TX on any band or mode except FM.
? 3.a. TX function is activated with PTT however, there is no modulation in any mode.
? ? ? ?(This was verified both via the supplied microphone as well as injecting an audio signal into the mic jack) ? 3.b. FM appears to have full power (I saw 40 watts on the meter.. I didn't check to see if this was a menu setting or just max for FM.)
4. CW mode checked. (plugged in a straight key I use on other radios).. Internal keyer functions and moves radio into TX however, no power from finals. I did do the master CPU reset (held <FAST> and <LOCK> while powering up the unit. No change to listed symptoms. This is really about the extent of my testing ability with the equipment I have.? So here are two questions: 1. Do any or all of these symptoms sound familiar to anyone here? 2. Recommendations for someone qualified to dig into this radio?? I got ripped off on an Icom repair by an alleged radio tech some years ago and I'm pretty gun-shy when it comes to sending a radio to someone so solid recommendations are appreciated.
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Wayne Carpenter KN2Z @minicowman
No. Nothing heard.
?
My HP generator does a good job of either AM or FM modulation and I had tested both functions on my Kenwood TS-590sg a few days ago.
?
But in this case I couldn't hear a signal at all and the S meter didn't move on RX.
?
I even tuned around a bit up and down in case the reference frequency had gone south but never found any signal.
?
One other test I did.. on 2m, I keyed up my Yaesu FT-50r on one of the local repeater frequencies and listened for anything on the 847. Again, tuning up and down almost 1 mhz each way.. Nadda.
?
I also took the unit off of the dummy load and connected it to my 6BTV in the back yard.. Setting the radio to FT8 frequencies (both 40m and 20m).. nothing heard other than standard white noise.
?
I fear that his radio may be not worth repairing.. but, not my radio and I'm not able nor willing to make a call like that.
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Hi you have a TX VCO out of lock, I will look it up for you it is easy to get it going, if affect SSB and CW only ? 73 ? Andrew ?
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From: [email protected] <[email protected]> On Behalf Of Andy Bosworth
Sent: 23 July 2024 19:08
To: [email protected]
Subject: Re: [YaesuFT847] No TX or RX? Is there any RX on FM with a known signal? ? On Tue, 23 Jul 2024, 18:44 Wayne Carpenter KN2Z @minicowman via , <mwcarpe=[email protected]> wrote: Howdy.? First off, I'm a vintage radio tech.. tubes (valves?) are my favorite things to work on. However, I have a friend & neighbor that has an FT-847 that he asked me to take a look at. Here's what I found as far as symptoms: 1. No AM at all. No TX, no RX, no reaction to PTT. Dead silent.
2. Radio is deaf on all bands. Zero receive. There is static but broadcasting a +3db signal in my shack (via my HP 8656B generator on each of the modes the radio can do, zero signal detected. At +3db, neighbors a block away should pick it up.)
3. No TX on any band or mode except FM.
? 3.a. TX function is activated with PTT however, there is no modulation in any mode.
? ? ? ?(This was verified both via the supplied microphone as well as injecting an audio signal into the mic jack) ? 3.b. FM appears to have full power (I saw 40 watts on the meter.. I didn't check to see if this was a menu setting or just max for FM.)
4. CW mode checked. (plugged in a straight key I use on other radios).. Internal keyer functions and moves radio into TX however, no power from finals. I did do the master CPU reset (held <FAST> and <LOCK> while powering up the unit. No change to listed symptoms. This is really about the extent of my testing ability with the equipment I have.? So here are two questions: 1. Do any or all of these symptoms sound familiar to anyone here? 2. Recommendations for someone qualified to dig into this radio?? I got ripped off on an Icom repair by an alleged radio tech some years ago and I'm pretty gun-shy when it comes to sending a radio to someone so solid recommendations are appreciated.
|
Is there any RX on FM with a known signal?
On Tue, 23 Jul 2024, 18:44 Wayne Carpenter KN2Z @minicowman via , <mwcarpe= [email protected]> wrote:
Howdy.? First off, I'm a vintage radio tech.. tubes (valves?) are my favorite things to work on.
However, I have a friend & neighbor that has an FT-847 that he asked me to take a look at.
Here's what I found as far as symptoms:
?
1. No AM at all. No TX, no RX, no reaction to PTT. Dead silent.
2. Radio is deaf on all bands. Zero receive. There is static but broadcasting a +3db signal in my shack (via my HP 8656B generator on each of the modes the radio can do, zero signal detected. At +3db, neighbors a block away should pick it up.)
3. No TX on any band or mode except FM.
? 3.a. TX function is activated with PTT however, there is no modulation in any mode.
? ? ? ?(This was verified both via the supplied microphone as well as injecting an audio signal into the mic jack)
? 3.b. FM appears to have full power (I saw 40 watts on the meter.. I didn't check to see if this was a menu setting or just max for FM.)
4. CW mode checked. (plugged in a straight key I use on other radios).. Internal keyer functions and moves radio into TX however, no power from finals.
I did do the master CPU reset (held <FAST> and <LOCK> while powering up the unit. No change to listed symptoms.
?
This is really about the extent of my testing ability with the equipment I have.? So here are two questions:
?
1. Do any or all of these symptoms sound familiar to anyone here?
2. Recommendations for someone qualified to dig into this radio?? I got ripped off on an Icom repair by an alleged radio tech some years ago and I'm pretty gun-shy when it comes to sending a radio to someone so solid recommendations are appreciated.
?
Thanks all!
?
73
?
WC/KN2Z
|
Wayne Carpenter KN2Z @minicowman
Howdy.? First off, I'm a vintage radio tech.. tubes (valves?) are my favorite things to work on.
However, I have a friend & neighbor that has an FT-847 that he asked me to take a look at.
Here's what I found as far as symptoms:
?
1. No AM at all. No TX, no RX, no reaction to PTT. Dead silent.
2. Radio is deaf on all bands. Zero receive. There is static but broadcasting a +3db signal in my shack (via my HP 8656B generator on each of the modes the radio can do, zero signal detected. At +3db, neighbors a block away should pick it up.)
3. No TX on any band or mode except FM.
? 3.a. TX function is activated with PTT however, there is no modulation in any mode.
? ? ? ?(This was verified both via the supplied microphone as well as injecting an audio signal into the mic jack)
? 3.b. FM appears to have full power (I saw 40 watts on the meter.. I didn't check to see if this was a menu setting or just max for FM.)
4. CW mode checked. (plugged in a straight key I use on other radios).. Internal keyer functions and moves radio into TX however, no power from finals.
I did do the master CPU reset (held <FAST> and <LOCK> while powering up the unit. No change to listed symptoms.
?
This is really about the extent of my testing ability with the equipment I have.? So here are two questions:
?
1. Do any or all of these symptoms sound familiar to anyone here?
2. Recommendations for someone qualified to dig into this radio?? I got ripped off on an Icom repair by an alleged radio tech some years ago and I'm pretty gun-shy when it comes to sending a radio to someone so solid recommendations are appreciated.
?
Thanks all!
?
73
?
WC/KN2Z
|
Re: No receive full scale
Thank you Andrew.
That’ll give me time to get the radio back from a local friend.
|
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|
Re: No receive full scale
Ok I can hepl6you here, when I get home next week, I will guide you through the repair.
Check the circuits and find the AGC line, it will close to the IF output, follow it back to the RF amp.
There maybe a negative rail generator, if so check this is working.
73
For now
Andrew
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On 13 Jul 2024, 13:04, at 13:04, Noel W2MSA <noelw2msa@...> wrote: I would like to fix it myself, if not, I would like to send it to get
fixed in the states.
thank you
|
Re: No receive full scale
I would like to fix it myself, if not, I would like to send it to get fixed in the states.
thank you
|
Re: No receive full scale
Adjusting rf gain makes no difference.
|
Re: No receive full scale
Where to look and fix this issue?
----- Mensagem de Andrew Lenton < a@...> --------- Data: Sat, 13 Jul 2024 08:43:41 +0100
De: Andrew Lenton < a@...> Assunto: Re: [YaesuFT847] No receive full scale
AGC fault, fairly simple
I live in the UK so logistics are expensive
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On 13 Jul 2024, 01:55, at 01:55, Andy Bosworth < sidthepop@...> wrote:
RF Gain up?
On Sat, 13 Jul 2024, 00:22 Noel W2MSA via groups.io, <noelw2msa=
My FT-847 that is used on a weekly basis now has no receive yet meter
is
displaying full scale on any band and any mode except for FM.
Looking for a repair tech.
73, de W2MSA
----- Fim da mensagem de Andrew Lenton < a@...> -----
|
Re: No receive full scale
AGC fault, fairly simple
I live in the UK so logistics are expensive
?Get BlueMail for Android ?
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On 13 Jul 2024, 01:55, at 01:55, Andy Bosworth <sidthepop@...> wrote: RF Gain up?
On Sat, 13 Jul 2024, 00:22 Noel W2MSA via groups.io, <noelw2msa=
[email protected]> wrote:
My FT-847 that is used on a weekly basis now has no receive yet meter is
displaying full scale on any band and any mode except for FM.
Looking for a repair tech.
73, de W2MSA
|
Re: No receive full scale
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My FT-847 that is used on a weekly basis now has no receive yet meter is displaying full scale on any band and any mode except for FM.
Looking for a repair tech.
73, de W2MSA
|
My FT-847 that is used on a weekly basis now has no receive yet meter is displaying full scale on any band and any mode except for FM.
Looking for a repair tech.
73, de W2MSA
|
Re: FT-847 IN TX ALL TIMES
I never use this plug into the extension speaker socket.?
It not needed if you use the mic input on the PC or laptop and use the amp on the soundcard to boost the signal get the desired input level.?
I think was designed for soundcard interfaces that have low level input line-in only. ?
73 de Ian G8ZHC
Ah, that's much better.
So, a question:? With that bottom right connector going to the
external speaker jack, the audio input to the computer's sound card
becomes dependent on the volume setting on the front panel which is
annoying and prone to error.? I presume it also interrupts the
internal speaker, so can't simply be left in.?
Is it needed?
Greg? KO6TH
Ian M via wrote:
Hopefully this version is uncropped as I did the previous
version from my phone.
Nice circuit, but it's slightly
cropped.? The two plugs on the right...? The top one goes to
the TRS Data I/O port; where does the lower one go, and what
is the rest of the "USE THIS F..." text?? Seems to be
important...
Greg? KO6TH
Ian M via wrote:
This is what have been using for the last
25 years with the FT-847 with various data modes in
both SSB & FM including FT-8
Credit goes to ( I think) Jim Barber
N7CXI who co-wrote W95SSTV which it was initially
designed for.
Hope it helps
I've used my FT-847 on both 6 and 2M,
no problem.? Just used the sample interface circuit
in the manual.??
73,
Tom K6EU
MAN, you
guys are good !!!!..? Very obvious thing
overlooked. HI.? All good now.? I had schematics
out last night trying to figure out what
components could be bad.? You made my day.? Any
of you using something for FT8?? I had it
receiving FT8 through the DATA IN/OUT plug but
was trying to get transmit working.? I notice
there was a claim that the DATA IN/OUT only
worked on HF and I wanted it for 6 M. Probably
have to go into mic jack for that and PTT.? Any
units on the market that do that?? Have not
looked.? 73 Mike K4PI
|
Re: FT-847 IN TX ALL TIMES
Ah, that's much better.
So, a question:? With that bottom right connector going to the
external speaker jack, the audio input to the computer's sound card
becomes dependent on the volume setting on the front panel which is
annoying and prone to error.? I presume it also interrupts the
internal speaker, so can't simply be left in.?
Is it needed?
Greg? KO6TH
Ian M via groups.io wrote:
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Show quoted text
Hopefully this version is uncropped as I did the previous
version from my phone.
Nice circuit, but it's slightly
cropped.? The two plugs on the right...? The top one goes to
the TRS Data I/O port; where does the lower one go, and what
is the rest of the "USE THIS F..." text?? Seems to be
important...
Greg? KO6TH
Ian M via wrote:
This is what have been using for the last
25 years with the FT-847 with various data modes in
both SSB & FM including FT-8
Credit goes to ( I think) Jim Barber
N7CXI who co-wrote W95SSTV which it was initially
designed for.
Hope it helps
I've used my FT-847 on both 6 and 2M,
no problem.? Just used the sample interface circuit
in the manual.??
73,
Tom K6EU
MAN, you
guys are good !!!!..? Very obvious thing
overlooked. HI.? All good now.? I had schematics
out last night trying to figure out what
components could be bad.? You made my day.? Any
of you using something for FT8?? I had it
receiving FT8 through the DATA IN/OUT plug but
was trying to get transmit working.? I notice
there was a claim that the DATA IN/OUT only
worked on HF and I wanted it for 6 M. Probably
have to go into mic jack for that and PTT.? Any
units on the market that do that?? Have not
looked.? 73 Mike K4PI
|
Re: FT-847 IN TX ALL TIMES
Hopefully this version is uncropped as I did the previous version from my phone.
Nice circuit, but it's slightly cropped.? The two plugs on the
right...? The top one goes to the TRS Data I/O port; where does the
lower one go, and what is the rest of the "USE THIS F..." text??
Seems to be important...
Greg? KO6TH
Ian M via wrote:
This is what have been using for the last 25
years with the FT-847 with various data modes in both SSB
& FM including FT-8
Credit goes to ( I think) Jim Barber N7CXI who
co-wrote W95SSTV which it was initially designed for.
Hope it helps
I've used my FT-847 on both 6 and 2M, no
problem.? Just used the sample interface circuit in the
manual.??
73,
Tom K6EU
MAN, you guys are good
!!!!..? Very obvious thing overlooked. HI.? All good
now.? I had schematics out last night trying to figure
out what components could be bad.? You made my day.? Any
of you using something for FT8?? I had it receiving FT8
through the DATA IN/OUT plug but was trying to get
transmit working.? I notice there was a claim that the
DATA IN/OUT only worked on HF and I wanted it for 6 M.
Probably have to go into mic jack for that and PTT.? Any
units on the market that do that?? Have not looked.? 73
Mike K4PI
|
Andrew Lenton
Andy Bosworth
Ian M
