Check the coupling capacitor, C13, between the 12BY7A and the finals.
Rick, WD8JJA.
----- Original Message -----
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To: <yaesu@contesting.com>
Sent: Saturday, February 14, 2004 12:00 PM
Subject: Yaesu Digest, Vol 14, Issue 9
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> Today's Topics:
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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@worldnet.att.net>
> To: <yaesu@contesting.com>
> Subject: [Yaesu] Problem in FT-101E -100v Circuit
> Message-ID: <006e01c3f258$9b485ac0$6101a8c0@JerryPittman>
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> Reply-To: Jerry Pittman <jerryp49@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@att.net------------------------------
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> End of Yaesu Digest, Vol 14, Issue 9
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