Re: Vcc buss rails being pulled down.

From: Alan McCormick <weirdal1968_at_yahoo.com>
Date: Sun Oct 16 2011 - 19:51:54 EDT

Randy Fromm had a unique method of finding bad TTL chips. Ground the positive lead of a DMM in diode check mode and probe every pin. A pin will usually measure between .5 and .9 so everything outside that range is suspect. He also suggested using a current limited PSU and injecting it into a problem node to find the bad IC (it gets bloody hot) but that's a little too radical for my liking.

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Received on Sun Oct 16 19:52:04 2011

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