[1000mp] RS 232 Problem

[J. C. Mc Laughlin]

Dear George WA4GT:  The sensitivity to damage of the 232 chip in the FT1000 
rigs is one of the well known "features" of the family.

1.  An extensive search was made of plug-in chips on the reasonable basis 
that something that is going to need replacement should be easy to replace. 
Unfortunately, I was not able to find a reasonable way to mount a socket. 
If it had been my design, more room would have been allocated on the board 
and replacement of this vulnerable chip facilitated.  Alternatively, 
isolators should have been part of the design.

2.  External isolator boxes do exist, but have a cost and may not be 
completely effective.

3.  A pin-for-pin replacement chip does exist that has been designed to be 
more rugged.  202E is what I remember about its part number.  I do have a 
copy of its data sheet, if you are interested.

4.  Heavy use of common mode chokes is recommended around the cable between 
rig and computer.  A "green" wire from computer case to earthing buss and a 
second "green" wire from the rig to the earthing buss is recommended.

Let us all know what you ended up doing.  73,  Mac  N8TT
J. McLaughlin;  Michigan, USA
Home:  JCM at power-net.net
----- Original Message ----- 
From: "WD8ARZ" <wd8arz at comcast.net>
To: "George" <gtowerfl at comcast.net>; "All about Yaesu 1000mp" 
<1000mp at mailman.qth.net>
Sent: Sunday, September 19, 2010 9:05 AM
Subject: Re: [1000mp] RS 232 Problem


> You may have a blown rs232 chip. It has been known to happen from time to
> time due to RFI getting in on the data cable. Last time I dug into this 
> for
> someone, I suggested that when installing a replacement, use a IC socket 
> to
> make the next change out easier ... hi hi  Have not had that happen here,
> yet, but many have reported it.
>
> 73 from Bill - WD8ARZ
> http://www.hflink.net/
>
> ----- Original Message ----- 
> From: "George" <gtowerfl at comcast.net>
> To: <1000mp at mailman.qth.net>
> Sent: Sunday, September 19, 2010 8:26 AM
> Subject: [1000mp] RS 232 Problem
>
>
>>  My RS 232C port stopped working.
>>   I have reset CPU and menus to factor-default. And tried two computers.
>>  Thank You,
>>  George WA4GT
>>  I I
>
>