Brooke wrote: At power up the HP 3458A briefly says TESTING RAM and all the panel pixels are on then displays ISOLAOR DTACK. The repair manual says: 201 Outguard Controller A5. --------clip--------
Hi Brooke, The component-level packet is Agilent p/n 03458-90033. https://onlinestore.tm.agilent.com/Agilent/en/US/partnerMkt/onlinestore?cmd=eFAPCatProductDetail What's the p/n and Rev of the A5 outguard controller board in your particular box, and, if it has DS1220Y & DS1235Y Dallas Semiconductor Nonvolatile Rams, what are the date codes on those I.C.s? After the ISOLATOR DTACK error, did you hit "key shift blue" + "Error" keys to see if there are additional errors hidden behind the first? You have to keep hitting that key sequence until you've read all errors (if there are more than one). After you've read the last error, can you hit "key shift blue" + "Clear" to get the DMM to actually function? Or is it locked-up at that point? 73, Greg _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.