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Edited by TDave007 at 2017-2-7 22:58
Hi again. I have got a schematics about this oscilloscope and I have focuses the study about this error.
I think the component I have marked in the last message is a 330pF 50V SMD capacitor, but I think perhaps other component can be do this channel works bad.
In the TP201 I can get a perfect squarewave 1Khz from the calibration point, but when the signal passes to the "red circle" in the image, this is the zone where the signal is disturb.
Analizing the schematics, there are three ways to the signal arrives this zone: through the SMD capacitor, the OP AD8510 or the BAV99 switch diode.
I have to test the TP202 to be sure the photomos relay AQY280S woks well, but yesterday I hadn't more time to do it.
According to your experience, could you tell me which component might be failing?
Thank you very very much.
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