NVRAMs are Dallas parts with date codes of 2009 and 2010, which explains the 1934 CALRAM BATTERY sticker on the back of the instrument and may be the reason it was discarded. The next cal was going to be expensive. Not socketed.
There are 4 empty sockets next to the NVRAMs, is that for optional firmware? Are you saying only the 2kB part contains cal data? On Sat, Oct 26, 2019 at 5:35 PM Didier Juges <[email protected]> wrote: > Thanks Frank, it seems like it's time to take the covers off and figure > out what I've got. > > On Sat, Oct 26, 2019 at 3:38 PM Frank Stellmach < > [email protected]> wrote: > >> Didier, >> >> if you have the old board with DALLAS RAMs: >> >> - make a dump of the CALRAM into a file, as Poul-Henning explained >> - buy the 2kB and 2x 32kB DALLAS RAMs, available from several distributors >> - DS1220AD-120+ for about 11$/€ and DS1230Y-150+ for about 22$/€ will >> do the job >> - unsolder the old RAMs, and solder precision DIL sockets instead >> - use a programmer like the TL866 to first make an additional download >> from the RAM directly >> - program the content of the old CAL RAM to the new 2kB one, and insert >> all three new RAMs, maybe add these four 32kB RAMs for additional data >> buffer >> >> Alternatively, you can replace the nvSRAMs by FRAMs, description >> somewhere in eevblog, or at TiN >> >> if you have the new board with the SnapHat batteries, you can't upload >> the RAM content again, but: >> >> - buy 2 SnapHat battery replacements >> - switch on the instrument >> - remove the old batteries >> - insert the new batteries, I would support the PCB with something like >> isolated plastics, due to heavy bending forces >> >> video and description at M. J. Lorton (not competent at all, but >> instructive) >> >> Frank >> >> >> _______________________________________________ >> volt-nuts mailing list -- [email protected] >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com >> and follow the instructions there. >> > _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com and follow the instructions there.
