Re: WANTED : in-circuit IC tester

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@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@comcast.net>
>> To: "Technical Tools Mail List" <techtoolslist@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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Received on Wed Jul 31 21:07:08 2013