[1000mp] MAX232 replacement.... not a big deal.

[K2NV]

Blake,

I had FT1000MP/V plugged into a USB->Serial converter and the CAT was  
still damaged by a fairly close lightning strike.
It was strong enough to flip some circuit breakers.  I lost CAT in an  
FT847 and FT1K plugged into the same 4 port USB->Serial converter.

These threads are helpful, I will change em myself in the future!

73
Tony - K2NV


On Aug 28, 2006, at 11:11 AM, n4gi at tampabay.rr.com wrote:

Use a USB-serial converter.  I took a lightning hit last week (TV
cable).  The MP which was plugged directly into the PC serial port had
its CAT damaged.  My other MP which is controlled with a Microkeyer
(USB) was unharmed.  Perhaps it's coincidental, but every other
parameter was the same between the two rigs (same AC circuit, ground,
etc.)

73,
Blake N4GI

----- Original Message -----
From: Cecil Acuff <chacuff at cableone.net>
Date: Monday, August 28, 2006 9:09 am
Subject: Re: [1000mp] MAX232 replacement.... not a big deal.
To: All about Yaesu 1000mp <1000mp at mailman.qth.net>

> I'm sure there are external opto isolators available in a DB9-DB9
> package
> that can be plugged right into the rear of the receiver between
> your cable
> and the CAT interface to protect the interface from future
> failures due to
> lightning and other overload situations...
>
> Cecil...
> ----- Original Message -----
> From: "PA5CA Frans" <pa5ca at chello.nl>
> To: <1000mp at mailman.qth.net>
> Sent: Sunday, August 27, 2006 3:48 PM
> Subject: [1000mp] MAX232 replacement.... not a big deal.
>
>
> As I wrote previously I have fried my MAX232 CAT interface chip in
> my brand
> new FT1000MP.
>
>
>
> We replaced the chip last Friday and have to admit that is was not
> a
> nightmare scenario.
>
> We gently removed the covers of the FT1000mp Mark V field, be
> aware that the
> carry handle need to be removed as well!
>
> After removing the two covers the FT1000mp has to be turned upside
> down and
> the MAX Q5006 can be found (rear facing toward you) at the right
> hand site.
>
> It is close to the 9 pin SUB D connector.
>
>
>
> There are several ways the remove the old IC, we did it by
> dropping some
> extra solder and melted all solder at one site and gently lift the
> IC, did
> the same with the other side.
>
>
>
> We removed the extensive solder, than placed the new MAX232,
> solder the
> whole lot.
>
>
>
> Few things to note:
>
> Do not try to put too much force while lifting one side of the IC.
>
> Annoying, a whole bunch of electrolyte capacitors sitting in the
> way. pay
> some attention do not overheat them while un or soldering! I do
> not
> understand why Yaesu designs the control board in such way that a
> part which
> easily fries at such place. the is plenty space to do it more
> sufficient.
> I think removing the old IC using hot air is not wise. due to
> nearby parts!
>
>
>
> Hint. if you can find the time to do ( I 'll certainly do so in
> the near
> future ) design a little board with a DIL size MAX232 in a socket,
> use
> OPTO's in order to achieve the galvanic separation.
>
> Remove the original MAX232 and use thin wires to connect your
> extension-board to the terminals of the removed MAX232. We are
> only speaking
> of six wires, ground and  5V for the MAX232, 12V needed for the
> OPTO' s.
>
> There is however enough space around the control-board.
>
>
>
> So folks this is my contribution for solving CAT problems..
>
>
>
> TNX for the support sofar.
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