Hi.
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> Can you open the case and try to reseat the LCD cable ? Maybe that will solve the problem.
Erik, did you design the printed circuit board ?
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Before I started to disassemble the device, I decided to check if the signal generator was working. A picture of this menu is attached to the letter, the problem also affected this part of the control circuit. When I selected LOW OUTPUT - ON from the menu, a signal appeared at the RF tinySAoutput, but the frequency barely ran 50MHz. From that frequency onwards, the device could no longer hold the signal carrier. I have not tested the signal generator of this device before, so I have no comparison of how it should work.
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I opened the tinySA ULTRA at Erik's suggestion and a visual test did not detect any poor connections.
Since I have had problems with similar cable connections in other devices before, I cleaned the cable terminals just in case (even though there was no visible problem).
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After reconnecting the ribbon cable, almost all problems disappeared. Self Test was successful.
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Even after a successful Self Test, the signal generator is unable to transmit a signal in normal mode, I have to activate LOW OUTPUT - ON in the menu. Is this a normal approach or is there another problem here? I also took a picture of the last measurement.
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Erik, based on the information you provided, could you tell me which terminal in the ribbon cable had a poor connection? I'll look at it later with a powerful microscope. (It seems that some types of connectors are not worth the money.)
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Sincerely,
g
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Gerd