Two comments the manuals available on agilent What on earth is a crossguard?
On Tue, Dec 11, 2012 at 3:16 PM, Bruce Griffiths <bruce.griffi...@xtra.co.nz > wrote: > Ulrich Bangert wrote: > >> Gentlemen, >> >> I own a dead HP34401. On switching it on the display stays dark. It will >> however react on pressing the SHIFT key. >> >> By changing pcbs against a working one the display board has shown to be >> ok. >> There must be a problem with the main board. Without knowing whats inside >> the ASICs make trapping the problem difficult. One strange thing that I >> see >> is that there is a 7 kHz repeating reset signal on the reset line that >> does >> NOT come from the voltage regulator's reset output but must be generated >> by >> the processor or an ASIC. Anyone having an idea to that? >> >> Best regards and TIA for your answers >> >> Ulrich Bangert >> www.ulrich-bangert.de >> Ortholzer Weg 1 >> 27243 Gross Ippener >> >> >> ______________________________**_________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/** >> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >> and follow the instructions there. >> >> >> > Which reset? > Assuming the circuit is the same as mine (Setember 1991 -October 1991) > The Floating logic reset, the Earth referenced resets: 8051 reset > (generated by absence of crossguard comms) or the 9914 reset? > The only ASICS are U101(analog switch array), U102(resistor array) and > U501 (gate array), none of which generate a reset. > > Bruce > > Bruce > > ______________________________**_________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> > and follow the instructions there. > _______________________________________________ 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.