Looking forward to your notes Todd. A bit more info on the repair. DCV1 is OK except for the 10 V range. A test voltage input of 100 mV appears on the input side of Q665 fine, but not on the output side in the 10 V range, however a DMM measurement is solid in the other applicable ranges. So this issue does seem to be completely isolated to the 10 V range.
DCV2 input is fine through the path to the ADC (TP652) in all ranges, but the unit is not making a stable measurement. For example, a 9 V input reads between 8.8 V and 9.2 V on the 10 V scale. The same 9 V input to DCV1 also looks good up to TP652, on the 100 V range since 10 v is out it, and it reads a stable 9.002 V at that TP. Without a schematic, it will take some time to determine what is different after the TP652 point - maybe there are in fact 2 ADCs, but it's not obvious either way. Russ On Sun, Jun 26, 2016 at 11:16 AM, Todd Micallef <[email protected]> wrote: > I have to review my notes, but I know of the two bad parts that were > found, one was the TF-245. I happened to have a spare on hand. I will look > through any notes to get the other part number. > > Todd > > Sent from my iPad > > > On Jun 26, 2016, at 10:09, Russ Ramirez <[email protected]> wrote: > > > > Thanks Illya - very nice piece of work! > > > > Russ > > > >> On Sun, Jun 26, 2016 at 5:27 AM, Illya Tsemenko <[email protected]> > wrote: > >> > >> If you looking into repair or internals detail of 2182, this draft > article > >> may help: https://xdevs.com/fix/kei2182/ > >> Keithley stopped releasing schematics and detailed information since > >> xxxx-series instruments due to IP issues. > >> > >> 26/06/16 18:08, Brian Smith пишет: > >> > >> Hello Russ > >>> > >>> It appears that there are neither a service manual nor a schematic > >>> available anywhere. > >>> > >>> My educated guess is that this is because the 2182A is a current model > >>> instrument. The newest production model keithley gear does not have > >>> associated service manuals nor schematics published. These appear to be > >>> treated as trade secrets. > >>> > >>> You can have your 2182A serviced by Keithley if it is in need of > repair. > >>> > >>> I had my model 2000 DMM that I bought from eBay serviced by Keihtley > for > >>> $560. They replaced the motherboard bringing the DMM up to brand new > >>> condition. I asked for and received the calibration data with the > returned > >>> instrument. > >>> > >>> best regards, > >>> > >>> Brian > >>> > >>> > >>> > >>> On Fri, Jun 24, 2016 at 10:38 PM, Russ Ramirez <[email protected] > > > >>> wrote: > >>> > >>> The service manual, or a schematic. I asked just in case someone had > one > >>>> from an original purchase. I also asked a friend who worked for > Keithley, > >>>> but apparently no one he knew had one either. Hard to find. > >>>> > >>>> Russ > >>>> On Jun 24, 2016 6:26 PM, "Brian Smith" <[email protected]> > >>>> wrote: > >>>> > >>>> What document do you need? Keithley publishes most needed docs. > >>>>> On Jun 24, 2016 12:59 PM, "Russ Ramirez" <[email protected]> > >>>>> wrote: > >>>>> > >>>>> Just wondering if any of you might have a PDF of the subject > >>>>>> > >>>>> Nanovoltmeter? > >>>>> > >>>>>> TIA > >>>>>> > >>>>>> Russ > >>>>>> _______________________________________________ > >>>>>> volt-nuts mailing list -- [email protected] > >>>>>> To unsubscribe, go to > >>>>>> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > >>>>>> and follow the instructions there. > >>>>>> > >>>>>> _______________________________________________ > >>>>> volt-nuts mailing list -- [email protected] > >>>>> To unsubscribe, go to > >>>>> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > >>>>> and follow the instructions there. > >>>>> > >>>>> _______________________________________________ > >>>> volt-nuts mailing list -- [email protected] > >>>> To unsubscribe, go to > >>>> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > >>>> and follow the instructions there. > >>>> > >>>> _______________________________________________ > >>> volt-nuts mailing list -- [email protected] > >>> To unsubscribe, go to > >>> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > >>> and follow the instructions there. > >>> > >> > >> > >> > >> _______________________________________________ > >> volt-nuts mailing list -- [email protected] > >> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > >> and follow the instructions there. > >> > > _______________________________________________ > > volt-nuts mailing list -- [email protected] > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > and follow the instructions there. > _______________________________________________ > volt-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
