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Soviet Oscilloscopes (Made in USSR)

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didyman:
Hi.

I have a C1-93 in a very good overall shape, but it needs a re-set on its compensation trimmer capacitor set. I need a real service manual (not the only available containing the schematic only) to how and in wich order it has to be set with what signal. Basically I know the goal and I can figure out at wich divider wich pairs should be trimmed, but an official solution would be more convenient.
Symptom is in Ch1, 1V range (and only that one, anything over and above it is OK) starts to roll off signal at around 5 kHz and goes to almost half value around 300 kHz and after it stays there. square wave is also very bad at 5 kHz. Trimming C6 cures this frequency dependent division, but of course at the expense of the squareness of more ranges.

serg-el:
ะก1-93
Operating instructions and service manual.
And schematic diagrams

didyman:
Thank You very much. :) Yandex can translate the pages quite good, so I can make required measurements and setting much easily. Thank You very much, serg-el.
I must tell this is a very good oscilloscope. I never met these old soviet era devices-I have a N313 but that is a very easy device. This one-I didn't expect such a well made design. Rockstable trigger, big and very good focussing screen and formidable amplifiers. I never believed such an old device can be as useable. I got it and tried it and wow. :) It is a very good instrument and I will make good use of it. However, some small errors have to be corrected, but it already well useable.

didyman:
Finally I had time for the compensation network and as I suspected, there was an error there: C18 has one of its leg without connection, so that made the weird frequency dependency and bad compensation. It wasn't hard to find, but was hard to reach-fold out all parts and remove shielding was a delicate work. Finally the compensation is fine, and all measurement range is perfect as it can be. Thank You again, Serg-el.

free_electron:
where are the digital scopes ?

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