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New Hantek DSO2X1X models?

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Cántabro:
Hello, greetings, with the latest updates, has the trigger problem been solved?, which did not stop the image, it was said that the trigger worked by software, not by hardware. Does it work with the latest updates correctly? It is something that stops me from purchasing

morgan_flint:

--- Quote from: Joemega on September 12, 2023, 11:23:47 am ---...sorry for my bad english...

Maybe, your problem is the same like mine DSO2D10 after a few month: suddenly shortcut in one of rotary encoder case (GND) to the inner encoder PCB.
It's blocking the data lines.
Mine repair was simple: teardown the encoder case, a little tape to isolate.
Search this video in YouTube: "Hantek DSO5202P: Knobs/Encoders Not Working Repair"
Maybe helping you...

--- End quote ---
Hello and thank you! Sorry for the late response! I didn't get or maybe I didn't see the email announcing your post. I'll see the viden and try if it's the same problem.

In the meantime, I've ordered the HC4051 to replace U2, waiting for it to arrive. With a bit of luck, the problem will be solved by the time it arrives!

serafis:
In the manual, P51 Auto Scale, it says "Trigger Coupling is adjusted to DC, Noise Reject or HF Reject". Implies it has this capability - is there a way of setting Trigger Coupling manually (e.g. to Noise Reject)? I can't find it under the Trigger menu or Auto Set menu!

morgan_flint:

--- Quote from: morgan_flint on September 18, 2023, 09:06:58 am ---
--- Quote from: Joemega on September 12, 2023, 11:23:47 am ---...sorry for my bad english...

Maybe, your problem is the same like mine DSO2D10 after a few month: suddenly shortcut in one of rotary encoder case (GND) to the inner encoder PCB.
It's blocking the data lines.
Mine repair was simple: teardown the encoder case, a little tape to isolate.
Search this video in YouTube: "Hantek DSO5202P: Knobs/Encoders Not Working Repair"
Maybe helping you...

--- End quote ---
Hello and thank you! Sorry for the late response! I didn't get or maybe I didn't see the email announcing your post. I'll see the video and try if it's the same problem.

In the meantime, I've ordered the HC4051 to replace U2, waiting for it to arrive. With a bit of luck, the problem will be solved by the time it arrives!

--- End quote ---

EDIT: Indeed, that was the problem!!!!

One of the encoders had one of the sides derived to the case, which in turn is connected to the ground. As the video that @Joemega suggested to view explains, this is equivalent to having Scan_Data_4 or Scan_Data_6 (the latter in my case) connected to ground via the corresponding diode, so no change for any of the encoders is detected when Scan_Line_X selects them (see first attachment).

So I did the same as @Joemega: opened the offending encoder by straightening the 4 tabs that hold the plastic part to the case and insulating the plastic part from the metallic part with some tape.

As you can see in the 2nd and 3rd photos, the failure was caused by a bad encoder's design (I don't think it can be fully blamed on Hantek, but mostly on their supplier...). The plastic part has conductive circular tracks embedded and these tracks have four little spikes (two at each side) protruding from the plastic matrix exactly where the aforementioned tabs lay when the encoder is closed. Depending on how the tabs are pressed during manufacturing, maybe there will be contact or not, but the distance would be very short, so just with normal use or with a light blow on the buttons this contact may happen, as was in my case.

Now the scope is back to normal and the panel self test goes OK. From what I've seen in the eediscuss forum, this failure is not that uncommon (not only for DSO2000 series, as the video is for another model), so maybe this can help if your oscilloscope develops this failure over time.

Many thanks to @Joemega for spotting the solution and to @DavidAlfa for his help analyzing the failure.

serafis:
After applying all the mods I wanted and overclocking to CPU 720MHz, memory 408MHz, to my DSO2D10, I'm very happy with the performance and stability of my upgraded DSO2D15. No freezes or glitches after several hours of use. Thanks to DavidAlfa and others for the tips and tricks.

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