Hi Andrew. Yes, I have an HP 10529A as well as a BK Precison 550 (TTL9 and a 552 (CMOS) but as, I said, I don't find them 100% reliable. I'm thinking about a B&K Precision 560 like this: http://www.electronicrepairegypt.com/bk-precision-model-560-progammable-ic-t... Do you say that it behaviours more or less like a comparator? ----- Original Message ----- From: "Andrew Welburn" <andy@andysarcade.net> To: "Technical Tools Mail List" <techtoolslist@flippers.com> Sent: Wednesday, July 10, 2013 10:26 AM Subject: Re: [Techtoolslist] Alpha Electronics Dynamic Integrated Digital ICTester on eBay
On 09/07/2013 22:01, Fabrizio Vasile wrote:
OK, John, tomorrow I will do the scans (there are also schematics) ad I will e-mail to you. Regarding TTL in-circuit testing, since I repair arcade PCBs for job , I'm looking for a good and reliable tester which can point me in right direction at least (logic comparators are not very reliable IMHO).
You must be doing something wrong then, the HP 10529A is your best friend. Don't think that a good in-circuit tester is going to tell you anything different to a comparator. In fact, in-circuit IC testing is less comprehensive than comparison, because a comparator actually takes account of the circuit hook-up, where an in-circuit tester has problems with tied/forced lines, conflicts and busses.
In-circuit testing cannot help you find faults that are to do with dry joints/cut tracks/speed issues, good though they are.
Yes, obviously best thing would be to test TTL manually with the truth tables and a logic probe, but , let's say, you have no schematics of the PCB and dozens of other board that are waiting you..:)
Like everything, an in-circuit ic tester is another tool in your arsenal against faulty pcbs, but there is no one tool that does the lot.
Andrew Welburn http://www.andys-arcade.com _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com http://seven.pairlist.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/
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