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

[Jim Dawson]

That would be nice, if you find them please post your source.

73 de,
Jim - K9DD

----- Original Message ----- 
From: "Cecil Acuff" <chacuff at cableone.net>
To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
Sent: Monday, August 28, 2006 8:09 AM
Subject: Re: [1000mp] MAX232 replacement.... not a big deal.


> 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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