Re: Question on Corvus controller card repair

[Charlie Springer <RAM@regnirps.com>]

On Fri, 26 Aug 2005 21:41:41 -0700, Kellion wrote
(in article <1125117701.824497.171480@g14g2000cwa.googlegroups.com>):

> 
> Ok, now I was searching Jameco for the parts needed to repair this card
> and I did a search for one of the chips I need..  In this case:
> 
> hd74ls20p
> 
> The search results I received from Jameco are:
> 
>  -  IC,74LS20
> 
>   -    	  IC,SN74LS02N,DIP-14,
> QUAD 2- INPUT NOR GATE
> 
>  -    	  IC,SN74LS20N,DIP-14,
> DUAL 4-INPUT NAND GATE
> 
> I am assuming the first on this list (IC, 74LS20) is the correct item
> but I wanted to be sure.  Others searchs for chips have similar
> results.
> 
> Any help would be appreciated,
> 
> Kellion...
> 

All three are good. You want a DIP (Dual Inline Package) and it is a 14 pin 
DIP, and the 7402 does indeed have two NAND gates with 4 inputs each.

You don't want packages like SOP, QFP, PQFP, PLCC, etc. Clipping the pins and 
desoldering one at a time is a good suggestion. Also, order quality machine 
pin sockets with gold plate, not tab pin sockets.

-- Charlie Springer