[Yaesu] FT one plug

[Dr. David Kirkby]

On 07/ 7/11 03:06 AM, zl3kr wrote:
> For your info the power supply in my FT-one I believe is the same as
> used in the FT107.  I have a circuit diagram of it and it is called FP107.
> It is not a switched mode supply, and I have repaired the first problem
> in which the Bridge Rectifier had blown, but then the regulator wasn't
> working. Unfortunately that is where the main problem is, in that it would
> seem that this PC Board(PB-2117) had been worked on before and the
> copper was literally
> falling off.

Alan,

Are you sure the board in the radio is the correct one for the rig? Has it ever 
worked for you?

I don't have time to go through the service manual now, but note that 
hifissb.com have a "Yaesu FT-ONE regulator unit PB-2258A"

http://www.hifissb.com/byaesu-ftone-regulator-unit-pb2258a-p-161.html

Is your "regulator unit" OK? I'm just wondering if someone has put the wrong 
board in following an unsuccessful attempt to get a working rig.

Note hifissb have a number of bits from an FT-ONE

http://www.hifissb.com/yaesu-bftone-c-108_81_92.html

They scrap rigs and sell them for parts. There's a reasonable chance they will 
have what you want. I'm sure it would help if you sent them a photograph of the 
bad  board and of the connector you want.

There's a local ham to me that sent me a big list of "shack clearence" items. I 
thought there was a non-working FT-ONE on there for £100, but just checked and 
noted the FT-ONE is working at £250, so its not going to be practical for you to 
buy that.

You might try asking if they have the board what you want. It is possible they 
have it, but someone has worked on it so they have decided not to sell the 
board. But if yours is in a very bad state, then perhaps they have something 
better than what you have.



> I have no experience in designing PC Boards but am trying
> to make up something
> to do the job, but it has to be exact size to mount in the power supply
> (mounting holes and
> component height are a couple of the restrictions.

I'd be very reluctant to use an PCB as a power supply where the tracks are 
falling off. You should ask around locally - there may be someone willing to 
make you a new PCB from the track layout. You have the poor board, but the track 
layout will be in the manual too.

If the board can be removed without desolding things (i.e. its one of the many 
plug-in boards of the FT-ONE), then if you want any photographs from an FT-ONE 
or the board, let me know. I have a good quality camera (Nikon D3) with a Nikon 
macro lens, so can produce decent quality close up pictures.

My experience is that if replacing components on a board from the era of the 
FT-ONE, then modern components will be smaller. I doubt you will have to worry 
too much about restrictions.

> So while I work on that I was hoping to be able to connect an external
> supply to get the
> rig going again in the mean time.

Of course the place to do that would normally be on that connector on the rear 
of the rig. If you can't connect internally to the write place, perhaps just a 
couple of wires out might be easiest.

> Alan ZL3KR



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