[Coco] 6809 Removal Process

[Mark D. Overholser]

On 1/26/22 15:10, Don Barber wrote:
> Hi folks, wanted to share something that's worked well for me. In 
> upgrading from 6809 to 6309, most everything I read talks about cutting 
> out the old chip, removing pin by pin, and soldering in a socket. This 
> destroys the old chip.
> 
> Instead, I used a heat gun and warmed up the chip/solder, and was able 
> to remove the old chip without destroying it. Its really pretty easy - 
> honestly easier than cutting pin by pin. One just has to be a bit 
> careful to not melt the capacitor right next to the chip. Then use a 
> soldering iron and solder sucker to clear the pads enough to plug in the 
> new socket.
> 
> I've done this twice, and both times the old processor worked just fine 
> when plugging it into the socket afterwards.
> 
> I used a cheapo heat gun from harbor freight - its $8.97. Its low 
> setting is 750 degrees which is more than enough to get solder above its 
> melting point (usually around 465 degrees).
> 
> Thanks,
> 
> Don
> 
> 


Don:

You can almost always, add "new" solder to the Pins, to provide more 
Mass and help "dilute" the old Solder before removing the solder...


MarkO