Re: WANTED : in-circuit IC tester

Hi Andrew.No, I know very well there is no equipment which can test TTL
in-circuit absolutely .
But , I meant, something that can point you in the right direction testing
in-circuit logic functions and not comparing like the HP 10529A
I think I'll get a B&K Precision 560 IC tester after trying to find an ABI
Boardmaster 4000 at a reasonable price with no success.
Then, if these in-circuit tester existe then they mean they are useful in
some way, don't you think?I presume you didn't spend a lot of money into
the ABI Boardmaster 4000 to keep it as an ornament..:)

2013/7/31 Andrew Welburn <andy@andysarcade.net>

> 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 18:11:00 2013