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[Yaesu] Problem in FT-101E -100v Circuit

To: <yaesu@contesting.com>
Subject: [Yaesu] Problem in FT-101E -100v Circuit
From: "Jerry Pittman" <jerryp49@worldnet.att.net>
Reply-to: Jerry Pittman <jerryp49@worldnet.att.net>
Date: Fri, 13 Feb 2004 12:41:26 -0500
List-post: <mailto:yaesu@contesting.com>
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 

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.
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