[Techtoolslist] WANTED : in-circuit IC tester

[JJ]

Thank you for your post on the 10529a.  I've only played with them a couple times.  I was hoping they would be helpful but I was loosing hope before your post.  I will spend more time using them and learning the quirks.

Thanks

Justin

Sent from my Verizon Wireless 4G LTE DROID

Andrew Welburn <andy at andysarcade.net> wrote:


>  As i've mentioned before, i think that you believe there is equipment 

>  out there that can give you a 100% accurate pass/go test on IC's. It 

>doesn't exist.

>

>Regarding the 10529A:

>

>  If an input node is tied to ground/5v because of an internal short, 

>then the comparison with a known-good IC will not show up any fault in 

>the 10529. Its rare to find, but does happen.

>

>  The comparator is just that, it presents the same inputs to a 

>known-good ic that the ic under test has. The outputs are compared, any 

>differences show up. Failure modes of IC's can be varied, and a 

>comparison method cannot find every single failure type in the same way 

>that node stimulation can't either.

>

>  The 10529A is by far, the best all-round tool you can own, laborious 

>though it is to use the ZIF socket to swap IC's and change pin 

>assignments. You have to remember to power-cycle the unit-under-test for 

>counters and flip-flops so that you get the same power-on states, 

>otherwise your comparisons will be wrong.

>

>  I'm talking from 13 years experience of arcade pcb repairing here, i 

>also own an ABI Boardmaster 4000, amongst other equipment for in-circuit 

>testing.

>

>  If you have written off the 10529A as no good then you stand no chance 

>using any of the other pieces of equipment to good effect. You need to 

>understand failures and how they can manifest themselves first.

>

>  The holy grail of a pass/go system you seek is not within reach.

>

>

>Andrew Welburn

>http://www.andys-arcade.com

>

>On 30/07/2013 21:07, Fabrizio Vasile wrote:

>> Yes, using the HP 10529A I had several times good IC showed as bad

>> (especially counters, flip-flop) but, most terrible thing,  a couple of

>> times I had also bad IC showed as good!

>> ----- Original Message ----- From: "JJ" <rugd2go at comcast.net>

>> To: "Technical Tools Mail List" <techtoolslist at flippers.com>

>> Sent: Tuesday, July 30, 2013 9:59 PM

>> Subject: Re: [Techtoolslist] WANTED : in-circuit IC tester

>>

>>

>>> Has anyone had good luck with the HP10529 ?  I seem to get a lot of

>>> false ic failures during tests.  Have you seen the HP ever show a

>>> failed IC test good?

>>>

>>> Justin

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