I been having trouble posting to the group... trying again. I have 2 non-working 9010A units. On both they beep once, LEDs flash, then nothing. Hooked up a working 9010A that I borrowed (thanks David). Bus tests fine. RAM returns the following: R/W ERR @ C000 BTS 08 - LOOP? Manual states: If a RAM failure occurs, carefully examine the diagnostic message. The RAM Test is usually sufficient for deducing the failed component directly. It then does not explain how to read the message. :-) I am new to this, so be kind if its a stupid question. I deduced that there is a Read/Write error at C000. How do I "deduce" the failed component? Barry _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com http://seven.pairlist.net/mailman/listinfo/techtoolslist FTP site is: ftp://ftp.flippers.com/TTL/TestEquipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/