The first unit was working correctly, but after I saved a waveform to checkout how that part of the unit worked, the ADJ rotary encoder started to play up.
Clicking ADJ to enter/exit fast adjustment mode still works correctly and holding it down brings up the test signal amplitude display correctly.
When used on the Trigger menu, ADJ rotation works correctly, selecting between AUTO, NORM and SING. It also rotates correctly between the rising and falling trigger menu options.
However, if I try to use the rotary encoder to adjust V/Div or Sec/Div, it no longer responds correctly as it used to.
Sometimes it will show a change by jumping to a value such as 20V if I rotate it quickly, but then you can only go down. Also, adjusting the vertical position indicators will only adjust up. As such, the unit has now been rendered useless.
I have checked the boards and all the soldering looks good.
Testing the voltages as shown in the user manual shows correct values everywhere.
Doing a factory default does not clear the issue.
I even unsoldered the rotary encoder board, checked it and resoldered it, but nothing fixes the issue. Everything else works as it always did.
Checking the forum posts, the issues I am suffering seem to indicate an activation code issue, even though the unit has never asked me for a code.
Could you please advise how I can obtain an activation code for the unit and how I would apply it, as I don’t think I actually have a hardware issue at all.
I have now built the second unit and it is currently working correctly, but I worry that it will also stop working soon.
Please let me know what I need to do next to try to get the DSO150 to work again.