[Techtoolslist] Alpha Electronics Dynamic Integrated Digital ICTester on eBay

[Andrew Welburn]

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