[Yaesu] FT-757GX with issues

[Rob Gallagher]

I sent this earlier to your email address and it got bounced.  Hopefully
this will get to you.....

**********************************************************************

Thanks and I will not spread the email address.

The serial number is: 3M 030223.

The load was a resistive 50 ohm load.

I used CW mode for the output power measurements.  I did also tried FM and
got the same results.

I tried several bands.  Decided there was a problem when 29.0MHz also had no
audio out.

I should have mentioned that there is a very low level hiss out of the
speaker in FM mode.  Similar to that when in USB mode the squelch is set to
a high level. (audio cut off)  I believe that audio circuit is working.
Either the discriminator output is bad or the squelch circuit is not working
correctly in this mode.  It does work correctly in the other modes.

Thanks again,

Rob

----- Original Message ----- 
From: "Rob Gallagher" <rob at gallagher.net>
To: <yaesu at mailman.qth.net>
Sent: Wednesday, May 19, 2004 8:11 PM
Subject: Re: [Yaesu] FT-757GX with issues


> Andreas,
>
> I did not see any additional text.  Did I miss it?  Also can you tell me
> what diodes are used for switching on the RF board?
>
> Tnx,
>
> Rob
>
>
> ----- Original Message ----- 
> From: "IK2WQI" <smtp01 at gmx.net>
> To: <yaesu at mailman.qth.net>
> Sent: Wednesday, May 19, 2004 10:21 AM
> Subject: Re: [Yaesu] FT-757GX with issues
>
>
> >
> > Rob,
> > what's the Ser# of the TRX?
> > Knowing this I can select the right service manual and, eventually, scan
> it to
> > a pdf file for you.
> > What did you use as load while measuring the output power?
> > What modulation mode did you select for the measures?
> > On what freq did you test the FM reception?
> > Maybe I can help you but I don't know if this will be of interest for
the
> > list. So please, direct e-mail contact for the following steps will be
> preferred.
> >
> > vy 73s de IK2WQI - Andreas Troschka - JN45OL
> >
> >
> >
> > Rob Gallagher wrote:
> > > I have acquired a FT-757GX and it has a couple of problems.  First
off,
> I do
> > > not have the service manual so if anyone has a copy please let me
know.
> > >
> > > The output is not consistance from band to band.  Ranges from about
40W
> on
> > > 160m to 100+W on 15m and 17m.  10m is also low.
> > > So it appears the PA is working.  There does not appear to be a band
to
> band
> > > adjustment so this is where the service manual is needed.
> > >
> > > The other issue is that there is no audio out on FM mode.  The
reciever
> is
> > > in fact working as shown by the s-meter but no audio.  Audio is good
on
> all
> > > other modes.
> > >
> > > Any insight to where to look is greatly appreciated.
> > >
> > > TIA,
> > >
> > > Rob - W3RG
> > >
> > > _______________________________________________
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> > > Yaesu at mailman.qth.net
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> > >
> > >
> >
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> >
>