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Re: New to me FT-101B

 

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Hey – that’s pretty cool!? I have a colleague that had the original FT-101E manual, the schematics, the sheet with the authorized service centers AND- - - da da ta!? A manual for the freq counter.? Not that I have that acceory, but I will go to FedEx office and get a high-rez scan.?? Whether or not the group wants me to share that or not.

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From: [email protected] <[email protected]> on behalf of Butchie_T - KA?WWT via groups.io <ka0wwt@...>
Date: Monday, February 24, 2025 at 3:33?PM
To: [email protected] <[email protected]>
Subject: Re: [Yaesu-FT-101] New to me FT-101B

Today was a nice day.

?

I was able to find an original FT-101B/E/EE/EX Service and Maintenance Manual. ?I never figured I'd ever find one but I did!?

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Complete with schematics, page of authorized dealers (circa Jan 77), and order blanks. Haha, wonder if that would still work. I kid, I kid.?

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Cheers,?

?

WOOT

--

Butch - KA?WWT
File /03 - FT-101 Original Series Operators and Maintenance Manuals/FT-101 Service Manual Document Regarding USA Brand Tubes.pdf uploaded #file-notice

Group Notification
 

The following items have been added to the Files area of the [email protected] group.

By: Butchie_T - KA?WWT <ka0wwt@...>

Description:
Schematic insert found in an FT-101 Service Manual. Circa 1977. I lay no claim of ownership to this file. It is posted here for all to use. B.T.

Re: New to me FT-101B

 

I actually came across an original FT-101B/E/EE/EX Service Manual. ?Which was an unexpected find for me.?
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Here is a document to add to the library of FT-101 items for all. I have never seen this until I found it in the manual.?
?
Cheers,
?
--
Butch - KA?WWT

FT-101 Service Manual Document Regarding USA Brand Tubes.pdf
FT-101 Service Manual Document Regarding USA Brand Tubes.pdf

Re: Diagrams

 

Hi,
????? ? Attached is a pdf of some of circuit details of the early model FT-101 Serial No. < 25,000 (I have that model).?

a) The main circuit diagram attached, is for the early model FT-101, note the internal details of the plug in modules identified as 'MJ(1), (2), ...' are not provided on that circuit 'assembly' drawing, but the interface pins of the plug-in circuits (MJs & PB numbers) are provided.?

b) The numbers of the plug in modules for the early model to look for (early model) are PB-1077B for the main receiver RF plug-in PCB, High Frequency IF Unit (PB-1084C) and the low frequency IF unit PB-1080A, for example. If the circuit diagram does not reference the PB-1xxx numbers listed, it is a circuit diagram for a later model.

c) The Fox Tango site does have a readable pdfs of early model circuit diagrams with circuits of the early model plug in modules included.

????? ? I hope this is of help.

Regards.

On Sunday 23 February 2025 at 06:40:41 pm AEDT, dreynolds273 via groups.io <dreynolds273@...> wrote:


Thank you! I'm well aware of Fox Tango.

Early-101-Hi_Res-Schematics.pdf
Early-101-Hi_Res-Schematics.pdf

Re: Early FT-101 problems

 

I will check the lamps. They do come on for a few seconds before the diodes blow. Thank you!
Re: Early FT-101 problems

 

Thank you! Sounds like a solid plan. I will let you know how it goes.?
Re: Diagrams

 

Thank you but I already have those manuals. As far as I can tell the schematics are all for B models and newer. Am I missing something??
Re: Diagrams

 

Thank you! I'm well aware of Fox Tango.
Re: Diagrams

 

de PP6EW
Emerson

Em sex., 21 de fev. de 2025 às 17:08, STEPHEN WIDDETT via <stevewiddett=[email protected]> escreveu:



On 21 Feb 2025, at 14:39, dreynolds273 via <dreynolds273=[email protected]> wrote:

?
Is anyone aware of where I can find schematics for early (below 25000 sn) FT-101's? I have a copy of the Yaesu service manual but as far as I can tell all the schematics are for B models and up.?

FT101_user.pdf
FT101_user.pdf
FT-101_man.pdf
FT-101_man.pdf
FT-101_Manual.pdf
FT-101_Manual.pdf

Re: Early FT-101 problems

 

One or more of the lamps (meter, VFO, triangle) might be shorted.? That will blow the two diodes.
Nestor
VE7RSN

Re: Diagrams

 

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On 21 Feb 2025, at 14:39, dreynolds273 via groups.io <dreynolds273@...> wrote:

?
Is anyone aware of where I can find schematics for early (below 25000 sn) FT-101's? I have a copy of the Yaesu service manual but as far as I can tell all the schematics are for B models and up.?

Re: Early FT-101 problems

 

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No expert here, but can suggest a few things.

Remove all the boards.

Measure the resistance to ground of the 13.5 vdc line.

If grounded, suspect the Dial Lamps housing shorting.

If all ok then, insert one board at time and check the 13.5 to ground.

Pay attention to the mixer board is installed correctly. One mounting tab to the rear and two?

mounting tabs to the front of the radio.

At this point, let us know. ?

Fernando N2FQ

On Feb 21, 2025, at 09:21, dreynolds273 via groups.io <dreynolds273@...> wrote:

I have an early FT-101 SN below 25000. Problem is it has no 13.5 volts. It keeps blowing D7 and shorting D8. I have replaced them with IN4004's which seems to be what most people use. I have also replaced C6 with a same value ceramic cap. Both 10.5vac lines on the xfrmr are good. The diagram I have shows the 13.5v going to the power jack but does not show where it comes out to the rest of the system. All other voltages at the xfrmr are normal. I suspect there is a short somewhere but I have no idea where to start tracing the 13.5 through the rest of the system. Any help is appreciated.?

Diagrams

 

Is anyone aware of where I can find schematics for early (below 25000 sn) FT-101's? I have a copy of the Yaesu service manual but as far as I can tell all the schematics are for B models and up.?

Early FT-101 problems

 

I have an early FT-101 SN below 25000. Problem is it has no 13.5 volts. It keeps blowing D7 and shorting D8. I have replaced them with IN4004's which seems to be what most people use. I have also replaced C6 with a same value ceramic cap. Both 10.5vac lines on the xfrmr are good. The diagram I have shows the 13.5v going to the power jack but does not show where it comes out to the rest of the system. All other voltages at the xfrmr are normal. I suspect there is a short somewhere but I have no idea where to start tracing the 13.5 through the rest of the system. Any help is appreciated.?

Re: New to me FT-101B

 

My turn for questions to the greater group as to what to do first.?
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I am pretty much at the last phase of my refurbishment of the FT-101B
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I have one issue to where the frequency on the rig and the actual frequency are off by a bit. I figure this will get remedied with the overall tuning up and alignment of the radio.?
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Thing is, what to do first, second, next, last.?
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Should I neutralize the tubes first or get the voltages right first then do the neutralization? (I have done it once with new tubes already, should I do it again?)
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Are there preliminary steps (ref section 7 of the Service Manual) to do prior to the TX Mixer / Driver and RX Front end stages??
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I'm happy to hear inputs from the community as to your approaches here.?
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I am in the home stretch and am ready to get this sweet lady back on the air.?
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Regards,?
?
--
Butch - KA?WWT

Re: New to me FT-101B

 

On Fri, Feb 7, 2025 at 10:58 AM, Alistair GM4ENF wrote:
No need to apologise - I have found your posts of use.? I expect to go down same kind of route with my 101Z at some point and your information has both encouraged me and given some degree of confidence!
?
Al
GM4ENF
Any questions you may have, I will certainly reply.
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Best of luck....It has been fun. Slow and Steady has been my mantra. And lots of pictures.... ; - ) ?
--
Butch - KA?WWT

Re: New to me FT-101B

 

No need to apologise - I have found your posts of use.? I expect to go down same kind of route with my 101Z at some point and your information has both encouraged me and given some degree of confidence!
?
Al
GM4ENF

Re: New to me FT-101B

 

Congrats!

Re: New to me FT-101B

 

I performed the rx and tx alignment by watching The Radio Shop video #142 on YouTube.?
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I am now .5 KHz off, down from 2.5K off. !!!!?
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Man, this is fun.?
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Sorry if I am bugging anyone with my posts. But I want to capture as much as I have done.....somewhere in case someone else new starts down this road.?
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Regards,?
--
Butch - KA?WWT

Re: New to me FT-101B

 

Dave,
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Everything that I have posted in this thread is how I finally got to this point. I believe the biggest thing was that I had some bad cap components that were changed out.?
During my initial inspection of each card and several components within the rig, I found some additional capacitors that had split. Those were identified and replaced along with all the electrolytic capacitors.?
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Capacitors on PB-1314A that control the Bias adjust were changed. Very good chance the originals were bad. All the capacitors in this radio were born before January 1975. So, replacing them was the best way to go for me.?
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If you look at the schematic on 1314A pin 4. That is the -20 VDC control voltage for the driver tube bias and the adjustment circuitry associated with it. There are a couple of electrolytic caps as well as a number of mylar caps that I ended up replacing as they were split. Reasonably sure that was where the driver bias adjust. problem I had ended up getting fixed.
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Now as I listen to the rig, I am ~2.5 k off (down) in frequency. So, an alignment is most definitely the next thing on my list to accomplish.?
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And that is gonna happen after I do the tube neutralization steps.?
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Regards,?
?
--
Butch - KA?WWT

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