Re: [neonixie-l] Re: Looking for MG-17G for calculator restoration
On Monday, 12 March 2018 16:17:45 UTC+4, Paolo Cravero wrote: > > Hi. > > Hi - welcome to the group. >> > > Thanks, but I've been around this list for a couple of years or more :) We > might have never contributed to the same thread, thoug > My bad! Apologies for that - I should have checked in the member's list - I recently accepted another member with a similar name... BTW, getting close to 1,000 members now... > I have both NOS and ex-equipment MG-17Gs, but I am 3,500 miles from my >> storeroom! If you can wait until April, I can certainly help with spare >> tubes. >> > > Thanks! No hurry: the device is supposed to stay with me for many years! > And I need to locate a suitable DC socket before bringing it out to the > public (office). Just let me know if I should set a reminder in my calendar. > Probably a GOOD plan - I'm notoriously forgetful, but I have decent stocks of these, so please remind me in the first week of April! Cheers Nick -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/015f43cf-d5a1-4582-8d8f-a8bbaebc57be%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [neonixie-l] Re: Looking for MG-17G for calculator restoration
Hi. Hi - welcome to the group. > Thanks, but I've been around this list for a couple of years or more :) We might have never contributed to the same thread, though. > Are you sure this isn't a driver fault or an issue with contamination on > the PCB causing leakage? > Unfortunately it is not a driver fault (checked with oscilloscope segment-by-segment comparison). I would have preferred to replace a 3-pin device rather than align a long-legged 9-pin component! PCB looks clean as I inspected it with a magnifier. I think that the calculator was laying on a side when the leak occurred and it stayed mostly in the battery compartment. I found no traces of previous attempts to clean it. I began suspecting a problem in the tubes when I could cure the fault by gently tapping tubes or the PCB near the tubes area. Tapping/moving other components resulted in no changes instead. The final confirmation came when I was holding the powered-up device and I got a small shock from 160V, so I let it roll on the desk. After this unexpected movement tapping didn't restore normal operation, segments stayed shorted together. DVM confirmed a 0 ohm short between A and F segments. Then I did the maze game, the two rings emerged from the back of their tubes and 3 and 7 look normal again. This calculator was meant to be portable, and it came in a nice case with handle: back in the old days probably it hasn't been sitting on a desk all the time and the ring connection could have been stressed. > I have both NOS and ex-equipment MG-17Gs, but I am 3,500 miles from my > storeroom! If you can wait until April, I can certainly help with spare > tubes. > Thanks! No hurry: the device is supposed to stay with me for many years! And I need to locate a suitable DC socket before bringing it out to the public (office). Just let me know if I should set a reminder in my calendar. Paolo -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CABj2VaYS6TyKqA5Woc4YAxVYXEBQeK7z4f-gGL8XjL66Lfd2GA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
[neonixie-l] Re: Looking for MG-17G for calculator restoration
Hi - welcome to the group. Are you sure this isn't a driver fault or an issue with contamination on the PCB causing leakage? I have both NOS and ex-equipment MG-17Gs, but I am 3,500 miles from my storeroom! If you can wait until April, I can certainly help with spare tubes. Cheers Nick -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/d607cc63-5df3-43c2-8dce-3cba445e373f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
