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 and follow the instructions there.