- oscilloscope image partial collapse - 3 Updates
| Mike Hooker <mhooker32@gmail.com>: Nov 02 07:30PM -0700 have an old heathkit io-10 auto ignition oscilloscope. from the center to the right side, the image is collapsed to the center.. a trace will only go from the left to the center, then its gone. you can see the right side image is collapsed in a verticle line, as its more intense . the trace from left to center is fine. it has vacuum tubes. all the tubes have heater glow. there are 2 pair of the same tubes, i swapped the positions to see if the problem moved. it didnt. i have a schematic pdf, not sure how to attach it. id like to get it going, but if its the crt, its pointless. where to from here? thanks |
| Phil Allison <pallison49@gmail.com>: Nov 02 08:22PM -0700 mhoo...@gmail.com wrote: =========================== > the trace from left to center is fine. it has vacuum tubes. all the tubes have heater glow. > there are 2 pair of the same tubes, i swapped the positions to see if the problem moved. > it didnt. i have a schematic pdf, not sure how to attach it. ** Schem: https://elektrotanya.com/heathkit_io-10_oscilloscope_sch.pdf/download.html#dl Try checking all the resistors in the horizontal circuits - after the scope has been off for 15 mins. One might have gone high or open. ..... Phil |
| whit3rd <whit3rd@gmail.com>: Nov 02 10:30PM -0700 > have an old heathkit io-10 auto ignition oscilloscope. from the center to the right side, the image is collapsed to the center.. If I'm reading the schematic right, there's two tubes that do the horizontal drive, V5 (2BS8) and V6 (12BH7) as well as a pair of pullup resistors, R50 and R48, each 22k ohms, 2W. Start checking those. |
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