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

[n4gi at tampabay.rr.com]

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.
> ______________________________________________________________
> 1000mp mailing list
> Home: http://mailman.qth.net/mailman/listinfo/1000mp
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:1000mp at mailman.qth.net 
> 
> 
> ______________________________________________________________
> 1000mp mailing list
> Home: http://mailman.qth.net/mailman/listinfo/1000mp
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:1000mp at mailman.qth.net
>