42 years for a dry joint from manufacturing to cause a problem!
Well, we all know that dry joints are caused by the joint not being heated enough when the joint is being formed. However, this one took 42 years to cause trouble! From the serial number, my FT-101ZD was manufactured in 1981. Last week, I noticed that it was low on receive on 10m, but seemed perfectly fine on the lower bands. I came here and had a read about causes for the rig being deaf. Checked the ATT switch and cleaned it with switch cleaner, checked the continuity of the fuse bulb and checked that I was getting S9+10db on 14.2MHz from the calibration oscillator. All checked out fine. I didn't think that it would be any of them anyway as the rig seemed to work perfectly OK on other bands. I was then looking for something specifically related to 10m, but in the end, that wasn't the case. I connected the antenna to the RX output and the sensitivity was fine, so I started looking for issues with the components near to SO239. Sure enough a dry joint was found where the inductor from the SO239 connected to the tx/rx relay nearby. A quick resoldering of this joint and my 42 year old rig was back to her former self in terms of sensitivity. I spent most of my working life in electronics, so I have seen plenty of crystaline "dry" joints in my time, but I've never known one to take such a long time before it actually caused an issue. When I looked under the sleeve (circled in the photo), the end of the inductor went through the relay terminal and was dangling loose in mid air with an obvious dry joint on the end of it. Why it only caused issues on 10m is a bit of a mystery, 12m was OK, 15m was fine too, although I guess that on lower bands the actual receive voltage from the antenna will be greater, so that may well be why. Seems a bit odd though. Anyone can beat this record time for a dry joint to cause issues? ;-) 73 de Gordon G8WWD 
|
I've been been adjusting and checking my old 101B and find I do not have correct voltage on clarifier terminal on VFO during receive. I'm only getting .850 volts, less than a 1 volt.
If I zero the clarifier and transmit I can match voltage with the zero adjustment pot. Roughly 3.70 voltage. I have a good supply voltage of 6 0 volts, and steady. Anyone see these conditions before, any help would be appreciated.
Todd
AL7PX?
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Re: Hard of hearing FT-101EX success!
Hello Richard - Just working backwords thru messages.? After much reading and thinking I think that the first RF Amp transistor is probably the culprit - although some have said another one can give trouble.? I have two concerns which are sort of associated: the only 3SK51 devices I have seen for sale over here are very expensive (and some advertised are not in fact that device.? Secondly my 101Z is in complete original condition (I bought it new 42 years ago) and I am reluctant to go unsoldering stuff unless I know it is the right device!? I have seen something that said a 40673 would replace the 3SK51 - and I have some of these from my 'construction period some 40 years ago!? No test gear so cannot go down that route.? Appreciate your interest and help. Alistair GM4ENF.
|
Re: Hard of hearing FT-101EX success!
Hello Richard - just catching up after a few days away from home.? email is alistairfyffe@...Alistair GM4ENF
|
Re: Hard of hearing FT-101EX success!
Thanks Kenoli,
Richard
On 2/15/2023 9:55 AM, Kenoli Oleari
KB6EMG wrote:
toggle quoted message
Show quoted text
A simple way to send big files for free is wetransfer.com. ? ?It
is free up to 2 GB and very easy to use. ?Just drag the image onto
the page put in the send and receive email address and push a
button. ?For security they often send a security code to your
email address.
It sends the addressee an email when it is ready to download.
—碍别苍辞濒颈
On Feb 14, 2023, at 8:25 PM, Richard kn7sfz
<kn7sfz@...> wrote:
Alistair, I see the schematic
attachment didn't make it intact, so if you'd like
to send me an email direct, I'll get it to you.? It
is 6 megs, so hope your email provider can handle
that.
Richard?
kn7sfz@...
On 2/13/2023 5:00 PM,
Richard kn7sfz via groups.io wrote:
Hi Alistair,
I tried to find a quality manual for your 101Z
online but they are all low resolution, however it
is obvious that your RF board is different from
the one in the FT-101EX. The good news is that
their RF MOSFET amplifiers are basically the same,
yours being the 3SK51 and mine the 3SK40, either
of which can be replaced by the $6 NET 454 off
Amazon, which I used to bring mine back to life.
I have attached a high res copy of the 101E
schematic and you can see the 3SK40 transistor in
the outlined PB-1181 RF board.? Sorry, I have no
way of highlighting it.? It is socketed, so that
made replacement quite easy.? I'm sure the
transistor is socketed in your board as well.?
Great care must be taken that you get each of the
four leads in their proper place when installing
the new transistor...very difficult for these old
eyes, even using a magnifying visor.
Good luck on your project and hope to hear of your
success,
Richard kn7sfz
On 2/13/2023 8:16 AM,
Alistair GM4ENF via groups.io wrote:
Hello Richard - good you got to the bottom of
problem.? I am interested in the subject; can you
post a copy of the circuit diagram highlighting
the semiconductor you replaced?? May help me to
cure my own hard of hearing 101Z
Alistair (Al) GM4ENF
|
Re: Hard of hearing FT-101EX success!
A simple way to send big files for free is wetransfer.com. ? ?It is free up to 2 GB and very easy to use. ?Just drag the image onto the page put in the send and receive email address and push a button. ?For security they often send a security code to your email address.
It sends the addressee an email when it is ready to download.
toggle quoted message
Show quoted text
On Feb 14, 2023, at 8:25 PM, Richard kn7sfz <kn7sfz@...> wrote:
Alistair, I see the schematic attachment didn't
make it intact, so if you'd like to send me an email direct, I'll
get it to you.? It is 6 megs, so hope your email provider can
handle that.
Richard?
kn7sfz@...
On 2/13/2023 5:00 PM, Richard kn7sfz
via groups.io wrote:
Hi Alistair,
I tried to find a quality manual for your 101Z online but they
are all low resolution, however it is obvious that your RF board
is different from the one in the FT-101EX. The good news is that
their RF MOSFET amplifiers are basically the same, yours being
the 3SK51 and mine the 3SK40, either of which can be replaced by
the $6 NET 454 off Amazon, which I used to bring mine back to
life.
I have attached a high res copy of the 101E schematic and you
can see the 3SK40 transistor in the outlined PB-1181 RF board.?
Sorry, I have no way of highlighting it.? It is socketed, so
that made replacement quite easy.? I'm sure the transistor is
socketed in your board as well.? Great care must be taken that
you get each of the four leads in their proper place when
installing the new transistor...very difficult for these old
eyes, even using a magnifying visor.
Good luck on your project and hope to hear of your success,
Richard kn7sfz
On 2/13/2023 8:16 AM, Alistair GM4ENF
via groups.io wrote:
Hello Richard - good you got to the bottom of problem.? I am
interested in the subject; can you post a copy of the circuit
diagram highlighting the semiconductor you replaced?? May help
me to cure my own hard of hearing 101Z
Alistair (Al) GM4ENF
|
Re: Hard of hearing FT-101EX success!
Alistair, I see the schematic attachment didn't
make it intact, so if you'd like to send me an email direct, I'll
get it to you.? It is 6 megs, so hope your email provider can
handle that.
Richard?
kn7sfz@...
On 2/13/2023 5:00 PM, Richard kn7sfz
via groups.io wrote:
toggle quoted message
Show quoted text
Hi Alistair,
I tried to find a quality manual for your 101Z online but they
are all low resolution, however it is obvious that your RF board
is different from the one in the FT-101EX. The good news is that
their RF MOSFET amplifiers are basically the same, yours being
the 3SK51 and mine the 3SK40, either of which can be replaced by
the $6 NET 454 off Amazon, which I used to bring mine back to
life.
I have attached a high res copy of the 101E schematic and you
can see the 3SK40 transistor in the outlined PB-1181 RF board.?
Sorry, I have no way of highlighting it.? It is socketed, so
that made replacement quite easy.? I'm sure the transistor is
socketed in your board as well.? Great care must be taken that
you get each of the four leads in their proper place when
installing the new transistor...very difficult for these old
eyes, even using a magnifying visor.
Good luck on your project and hope to hear of your success,
Richard kn7sfz
On 2/13/2023 8:16 AM, Alistair GM4ENF
via groups.io wrote:
Hello Richard - good you got to the bottom of problem.? I am
interested in the subject; can you post a copy of the circuit
diagram highlighting the semiconductor you replaced?? May help
me to cure my own hard of hearing 101Z
Alistair (Al) GM4ENF
|
Re: Hard of hearing FT-101EX success!
Hi Alistair,
I tried to find a quality manual for your 101Z online but they are
all low resolution, however it is obvious that your RF board is
different from the one in the FT-101EX. The good news is that
their RF MOSFET amplifiers are basically the same, yours being the
3SK51 and mine the 3SK40, either of which can be replaced by the
$6 NET 454 off Amazon, which I used to bring mine back to life.
I have attached a high res copy of the 101E schematic and you can
see the 3SK40 transistor in the outlined PB-1181 RF board.? Sorry,
I have no way of highlighting it.? It is socketed, so that made
replacement quite easy.? I'm sure the transistor is socketed in
your board as well.? Great care must be taken that you get each of
the four leads in their proper place when installing the new
transistor...very difficult for these old eyes, even using a
magnifying visor.
Good luck on your project and hope to hear of your success,
Richard kn7sfz
On 2/13/2023 8:16 AM, Alistair GM4ENF
via groups.io wrote:
toggle quoted message
Show quoted text
Hello Richard - good you got to the bottom of problem.? I am
interested in the subject; can you post a copy of the circuit
diagram highlighting the semiconductor you replaced?? May help me
to cure my own hard of hearing 101Z
Alistair (Al) GM4ENF
|
Re: Hard of hearing FT-101EX success!
Hello Richard - good you got to the bottom of problem.? I am interested in the subject; can you post a copy of the circuit diagram highlighting the semiconductor you replaced?? May help me to cure my own hard of hearing 101Z
Alistair (Al) GM4ENF
|
Hard of hearing FT-101EX success!
Success!!
Well boys and girls, I replaced the 3N211 mosfet on the HF board
with a $6 Amazon NTE454 and the little beast roared to life!
Next project is to clean the relay, as it's exhibiting a
slightly high resistance compared to rcvr RCA jack. This
continues to be a fun and learning experience and my thanks to
all of you who chimed in. The Facebook, Yootoob and email
reflector resources made this saga a mostly enjoyable one!
?Be well. de kn7sfz
On 2/3/2023 11:59 AM, Richard kn7sfz
via groups.io wrote:
toggle quoted message
Show quoted text
Thanks Roger, just grabbed it!
I have a 46 inch flat panel monitor, which makes it very easy
for me to zoom in and out and navigate the large jpeg image,
which I do indeed prefer to the pdf version (I have Adobe
reader).
I don't believe I'll need to print it out, as that is a little
more difficult with these old eyes.? It reminds me of a folded
schematic I have that goes with one of my old Galaxy V
transceivers.? It's about 2 1/2' tall and 4' wide, so I had to
hang it in front of me and it sure took up a lot of real estate!
??
The saga of my hard of hearing EX model continues.? I checked
out the bulb fuse and it was fine.? I then removed the HF board,
cleaned the edge connector and and RF mosfet? (3N211) socket and
still weak receive.? Then, following a well made YouTube video,
checked the? mosfet with a DMM and it seemed to respond well, so
I guess I won't need to replace it.? I suppose now it's time to
jump in with both feet and follow the signal path after I read
up a little more on how it's processed.
For anyone reading this who'd like to chime in, here's where I
am so far.? with a small length of wire in the antenna socket, I
can barely hear my signal generator on 7.100 with no S meter
movement.? When I connect the sig gen directly to the wire, it
gets much louder and the S meter moves up about halfway.? The
VFO seems to work fine and is accurate, as I can tune back and
forth.? However, turning the preselector has zero effect in the
volume or meter movement, so something is amiss there.? I'll
probably post this on the Facebook group as well.? I know I'm
not the first one to go down this road...haha!
Thanks Roger and everyone,
Richard kn7sfz
On 2/3/2023 9:56 AM, Roger VE7LB
wrote:
Hi Richard, I suppose that you don't have a good pdf reader as
the FT-101E_Late_Schematic.pdf in the files section is high res
11 x 30 inches. I just added a jpeg version of the same file in
the same folder. You could put the pdf version on a usb stick
and take it to one of the printers (Kinkos?) and get a full 11 x
30 inch printed.
73
Roger VE7LB group owner
|
carrier usb lsb modulation info
hello I would like to improve the audio response on my ft101zd , I would like to ask if these are the right adjustments to do I attach a photograph thanks
|
Re: FT-101 Main Tuning Dial Off Frequency
Sorry for the typos,... sausage fingers.? slop ring was supposed to be SLIP RING and VFO know?as supposed to be VFO KNOB.
You just hold the slip ring while rotating the VFO knob to get the 100KHz trim ring back on line, The 500KHz (black ink and red ink) disk behind the frequency window is the one you can reach in behind?and gently?turn/rotate to line back up on the vertical window? line but only after you have the VFO knob set to the frequency you "know" you are actually on. Transmit and receive frequency matching?is an entirely different?matter and I suggest you look at Buddy's YouTube site for that info
Search YouTube for, The Radio Shop .... and then look through his videos for FT-101?
On Mon, Feb 6, 2023 at 1:03 PM Bruce Collins < kb0tj1@...> wrote: If you are not an experienced?radio tech, you are asking for serious trouble?if you mess with either of those trimmer caps in the VFO compartment
I am a bit confused?as to what you are trying to do but:
The flat disk behind the VFO dial is not mounted very hard and you?can rotate it with a little pressure to line it back up. It will slip. There?is even a slop ring behind?the VFO know that can?be used to accomplish a similar thing, I had one once where the previous owner turned the 500KHz disk thing almost 100KHz out of whack and sold the radio to me for $100? because?it was "so far off" as to be unusable,' It took me 15mins to fix it.?
Bruce,
I can't find anything listed anywhere but it looks like TC1 adjustment trimmer cap in the VFO should do it. I would note the position of the cap before moving it so if you need to return it back you can. I would tune the main dial to a known freq of a net for instance, and try the adjustment to bring the receiver to it. It shouldn't take much adjustment to do this if it has just aged and shifted over time. You can access TC1 by lifting the processor board that is on top of the VFO box. TC2 is the drift cancellation adjustment. TC1 should be the one you want.?
73 Don ve3ids?
On Mon., Feb. 6, 2023, 1:02 p.m. mikemm58, < mmcauley@...> wrote: Bruce,?
One thing you might check is to make sure the lubberline, or the indica line is square with the center of the dial.?
Sometimes the escutcheon of the front of the radio gets put back on a little askew.?
I know it's a longshot, but might be worth looking at. Just a thought...
Mike
-------- Original message -------- Date: 2/5/23 10:17 PM (GMT-07:00) Subject: Re: [Yaesu-FT-101] FT-101 Main Tuning Dial Off Frequency
Hi everyone. I'm still looking for guidance on how to adjust the main analog dial on my 101-E to match the received USB frequency.? I recall seeing something about making an adjustment on the VFO unit but I'd appreciate confirmation and what exactly to adjust.? If there is a special method to use to make this adjustment I'd appreciate that info also. Thanks! Bruce
|
Re: FT-101 Main Tuning Dial Off Frequency
If you are not an experienced?radio tech, you are asking for serious trouble?if you mess with either of those trimmer caps in the VFO compartment
I am a bit confused?as to what you are trying to do but:
The flat disk behind the VFO dial is not mounted very hard and you?can rotate it with a little pressure to line it back up. It will slip. There?is even a slop ring behind?the VFO know that can?be used to accomplish a similar thing, I had one once where the previous owner turned the 500KHz disk thing almost 100KHz out of whack and sold the radio to me for $100? because?it was "so far off" as to be unusable,' It took me 15mins to fix it.?
Bruce,
I can't find anything listed anywhere but it looks like TC1 adjustment trimmer cap in the VFO should do it. I would note the position of the cap before moving it so if you need to return it back you can. I would tune the main dial to a known freq of a net for instance, and try the adjustment to bring the receiver to it. It shouldn't take much adjustment to do this if it has just aged and shifted over time. You can access TC1 by lifting the processor board that is on top of the VFO box. TC2 is the drift cancellation adjustment. TC1 should be the one you want.?
73 Don ve3ids?
On Mon., Feb. 6, 2023, 1:02 p.m. mikemm58, < mmcauley@...> wrote: Bruce,?
One thing you might check is to make sure the lubberline, or the indica line is square with the center of the dial.?
Sometimes the escutcheon of the front of the radio gets put back on a little askew.?
I know it's a longshot, but might be worth looking at. Just a thought...
Mike
-------- Original message -------- Date: 2/5/23 10:17 PM (GMT-07:00) Subject: Re: [Yaesu-FT-101] FT-101 Main Tuning Dial Off Frequency
Hi everyone. I'm still looking for guidance on how to adjust the main analog dial on my 101-E to match the received USB frequency.? I recall seeing something about making an adjustment on the VFO unit but I'd appreciate confirmation and what exactly to adjust.? If there is a special method to use to make this adjustment I'd appreciate that info also. Thanks! Bruce
|
Re: FT-101 Main Tuning Dial Off Frequency
Bruce,
I can't find anything listed anywhere but it looks like TC1 adjustment trimmer cap in the VFO should do it. I would note the position of the cap before moving it so if you need to return it back you can. I would tune the main dial to a known freq of a net for instance, and try the adjustment to bring the receiver to it. It shouldn't take much adjustment to do this if it has just aged and shifted over time. You can access TC1 by lifting the processor board that is on top of the VFO box. TC2 is the drift cancellation adjustment. TC1 should be the one you want.?
73 Don ve3ids?
On Mon., Feb. 6, 2023, 1:02 p.m. mikemm58, < mmcauley@...> wrote: Bruce,?
One thing you might check is to make sure the lubberline, or the indica line is square with the center of the dial.?
Sometimes the escutcheon of the front of the radio gets put back on a little askew.?
I know it's a longshot, but might be worth looking at. Just a thought...
Mike
-------- Original message -------- Date: 2/5/23 10:17 PM (GMT-07:00) Subject: Re: [Yaesu-FT-101] FT-101 Main Tuning Dial Off Frequency
Hi everyone. I'm still looking for guidance on how to adjust the main analog dial on my 101-E to match the received USB frequency.? I recall seeing something about making an adjustment on the VFO unit but I'd appreciate confirmation and what exactly to adjust.? If there is a special method to use to make this adjustment I'd appreciate that info also. Thanks! Bruce
|
Re: FT-101 Main Tuning Dial Off Frequency
Bruce,?
One thing you might check is to make sure the lubberline, or the indica line is square with the center of the dial.?
Sometimes the escutcheon of the front of the radio gets put back on a little askew.?
I know it's a longshot, but might be worth looking at. Just a thought...
Mike
toggle quoted message
Show quoted text
-------- Original message -------- From: sunrisegto@... Date: 2/5/23 10:17 PM (GMT-07:00) Subject: Re: [Yaesu-FT-101] FT-101 Main Tuning Dial Off Frequency
Hi everyone. I'm still looking for guidance on how to adjust the main analog dial on my 101-E to match the received USB frequency.? I recall seeing something about making an adjustment on the VFO unit but I'd appreciate confirmation and what exactly to adjust.? If there is a special method to use to make this adjustment I'd appreciate that info also. Thanks! Bruce
|
Re: FT-101 Main Tuning Dial Off Frequency
Hi everyone.
I'm still looking for guidance on how to adjust the main analog dial on my 101-E to match the received USB frequency.? I recall seeing something about making an adjustment on the VFO unit but I'd appreciate confirmation and what exactly to adjust.? If there is a special method to use to make this adjustment I'd appreciate that info also.
Thanks!
Bruce
|
Many thanks Richard. Great!
Peter G0LQU
Richard kn7sfz wrote:
toggle quoted message
Show quoted text
Sure Peter..her you go:
With that group and the great folks on this reflector, I feel very confident that I will have my 101EX hearing well in no time!
Richard kn7sfz
On 2/3/2023 2:31 AM, Peter Fardell G0LQU via groups.io wrote:
Richard - do you have a link to those facebook files please? I'll actually have to join facebook now after resisting for many years!
Kind regards
Peter G0LQU
Richard kn7sfz wrote:
I was able to download what I needed from the Facebook files...thanks all!
Richard kn7sfz
On 2/1/2023 5:08 PM, Richard kn7sfz via groups.io wrote:
Question from a newbie to the group. Has anyone scanned the long fold-out schematic for the FT-101E to a single high res jpeg file? If so, I would appreciate a link to download same. Being able to zoom in and out and scroll right and left would be great.
The chopped up schematics in the downloadable PDF manuals are difficult for these old eyes. I'm anxious to get started on my EX model that has weak receive and been reading about the bulb fuse and RF amp mosfet. Tnx for any help. Richard kn7sfz
|
Thanks Richard... ? Sent from for Windows ?
toggle quoted message
Show quoted text
From: Richard kn7sfzSent: 04 February 2023 17:09 To: [email protected]Cc: alistairfyffe@...Subject: Re: [Yaesu-FT-101] Schematic jpeg? ? Sure Al, here you go,
Richard kn7sfz
On 2/4/2023 12:56 AM, Alistair GM4ENF via groups.io wrote: [Edited Message Follows] Hello Richard.? Do you have a link for the Youtube video you referred to?? I have still not fixed my 'deaf; FT101Z which I asked about on here some 15 or so months ago.? I realise my equipment is different in lots of ways - but every little helps!
Alistair (Al)
GM4?NF
That should read GM4ENF...!
?
|
Sure Al, here you go,
Richard kn7sfz
On 2/4/2023 12:56 AM, Alistair GM4ENF
via groups.io wrote:
toggle quoted message
Show quoted text
[Edited Message Follows]
Hello Richard.? Do you have a link for the Youtube video you
referred to?? I have still not fixed my 'deaf; FT101Z which I
asked about on here some 15 or so months ago.? I realise my
equipment is different in lots of ways - but every little helps!
Alistair (Al)
GM4?NF
That should read GM4ENF...!
|
Hello Richard.? Do you have a link for the Youtube video you referred to?? I have still not fixed my 'deaf; FT101Z which I asked about on here some 15 or so months ago.? I realise my equipment is different in lots of ways - but every little helps!
Alistair (Al)
GM4?NF
That should read GM4ENF...!
|
Alistair GM4ENF
Bruce Collins
Don VE3IDS
