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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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I got to Q4497, it is not being triggered by wither the normal trigger or the auto.
I found (IIRC) Q4498 to be bad I think. With it in the end of the sweep switch is pretty much grounded all the time, I changed it and now it has voltage. Regular trig and auto, seems like two problems but as we all know it is likely just one. The only thing I can see dong it to both is the lack of detection of the end of the ramp out the switch. But where is that then ? I understand the Miller type ramp generator and I understand the switch changing the rate of charge, or I think in this case discharge. But somewhere the circle is not complete. Anyone familiar with this circuit or similar ? I am not completely stumped (yet) but I do not want this to take a year. |
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On Thu, 8 Apr 2021 21:28:59 -0700 (PDT), "
wrote: I got to Q4497, it is not being triggered by wither the normal trigger or the auto. I found (IIRC) Q4498 to be bad I think. With it in the end of the sweep switch is pretty much grounded all the time, I changed it and now it has voltage. Regular trig and auto, seems like two problems but as we all know it is likely just one. The only thing I can see dong it to both is the lack of detection of the end of the ramp out the switch. But where is that then ? I understand the Miller type ramp generator and I understand the switch changing the rate of charge, or I think in this case discharge. But somewhere the circle is not complete. Anyone familiar with this circuit or similar ? I am not completely stumped (yet) but I do not want this to take a year. https://groups.io/g/TekScopes/messages RL |
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