[Yaesu] Problem in FT-101E -100v Circuit (Jerry Pittman)

[Jerry Pittman]

Correction!!!  Sorry Rick,  I spoke to soon.  I pulled the C13 cap from the
circuit and found that it had shorted.  You were dead on for the diagnosis.
Now to go to the electronics shop tomorrow.

Thanks a Million!!
73 Jerry
WD4OIX

----- Original Message ----- 
From: "Jerry Pittman" <jerryp49 at worldnet.att.net>
To: "R_Davis" <WD8JJA at arrl.net>; <yaesu at contesting.com>
Sent: Sunday, February 15, 2004 5:59 PM
Subject: Re: [Yaesu] Problem in FT-101E -100v Circuit (Jerry Pittman)


> Thanks for the tip Rick.  I checked that cap and it appears okay, so the
> search goes on.
> Jerry
>
>
> ----- Original Message ----- 
> From: "R_Davis" <WD8JJA at arrl.net>
> To: <yaesu at contesting.com>
> Sent: Saturday, February 14, 2004 12:41 PM
> Subject: [Yaesu] Problem in FT-101E -100v Circuit (Jerry Pittman)
>
>
> > Check the coupling capacitor, C13, between the 12BY7A and the finals.
> > Rick, WD8JJA.
> >
> > ----- Original Message -----
> > From: <yaesu-request at contesting.com>
> > To: <yaesu at contesting.com>
> > Sent: Saturday, February 14, 2004 12:00 PM
> > Subject: Yaesu Digest, Vol 14, Issue 9
> >
> >
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> > >    1. Problem in FT-101E -100v Circuit (Jerry Pittman)
> > >
> > >
> > > ----------------------------------------------------------------------
> > >
> > > Date: Fri, 13 Feb 2004 12:41:26 -0500
> > > From: "Jerry Pittman" <jerryp49 at worldnet.att.net>
> > > To: <yaesu at contesting.com>
> > > Subject: [Yaesu] Problem in FT-101E -100v Circuit
> > > Message-ID: <006e01c3f258$9b485ac0$6101a8c0 at JerryPittman>
> > > Content-Type: text/plain;
> > > charset="iso-8859-1"
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> > > Precedence: list
> > > Reply-To: Jerry Pittman <jerryp49 at worldnet.att.net>
> > > Message: 1
> > >
> > > Hello to all,
> > > HELP!  I wonder if anyone has run into this problem:
> > >
> > > My 101E was just idling along while I was working on the computer the
=
> > > other evening, when I started smelling something hot.  I shot the rig
=
> > > off immediately and found that the bias control (VR1) on the voltage =
> > > control board (PB1547B) had over heated, as well as the (2) 10K =
> > > resistors on either side of the control.
> > >
> > > When I check the voltage at pin 5 of the 1547 board, I found that it
was
> =
> > > getting -160v instead of -100v.  I went to the Rectifier board
(PB1076B)
> =
> > > and made tests there.  When I disconnected the lead from the -100v =
> > > terminal, the voltage shows -60v but with it is connected it shows =
> > > -160v.  With the lead disconnected I also tested it for AC voltage and
=
> > > it shows 125vac as well as -60vdc.
> > >
> > > I checked all the components on the 1076B board and found all okay,
but
> =
> > > just to be sure I hadn't missed something, I put in a used PB1076B
board
> =
> > > and found all of the same readings.  I had already checked all of the
=
> > > other voltages coming and going from the 1076B and all are correct =
> > > except the -100v.  The voltages from all of the transformer taps
appear
> =
> > > to be within range as well.
> > >
> > > Does anyone have an Idea or run into this before?
> > >
> > > Thanks in advance for any responses.
> > > Jerry
> > > WD4OIX
> > > jerryp49 at att.net------------------------------
> > >
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> > > End of Yaesu Digest, Vol 14, Issue 9
> > > ************************************
> > >
> >
>