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.
