Hacking the DSO2X1X

[morgan_flint]

Hi, I have made a new Power Supply PCB board for the oscilloscope...

Hi, jovan_quineas.

Are the schematic and components the same as those in the original power supply, or did you introduce other improvements (apart from the 12V output)?

AFAIK, there have been two versions of the power supply. I have the older one and some components, at least the main diodes, tend to run hot, so some people in this forum suggested changing them for better alternatives.

[jovan_kineas]

Hello, the truth is I don't know if there are more versions of the power supply pcb, at the moment in all the photos that I have seen of this oscilloscope I have seen that they are the same as mine, I don't have the diagram but I can do it and share it Since I dismantled mine and remade it to make this new one, I have photos and notes of the value of each component, I will get to the work of making the diagram.

I also took on the task of leaving each component in the same location and using the same screen printing.

[morgan_flint]

Appart from some differences in the schematic (I'll try to find the posts), the first version had +-8V for the analog part, while the newest one is +-7V

[Aldo22]

Yes, there are at least 2 Versions. 8V and 7V. 7V is newer.

[morgan_flint]

One of the differences is in the main rectifier; in the older version, D5 are two SMD diodes in parallel that tend to overheat (in fact, one of them in Aldo22's post is charred...), and in the newer version is a bigger through-hole device.

In the older version, there was additional filtering (L1-C7) in the +8V output (simplified schematic here), because the +5V output derived from there with a buck converter.

I remember somebody posted the schematic of the newer version, but I can't find the post. If I remember well, the +5V output comes from its own winding in the transformer (feedback to the primary from here), and +-7V has another center-tapered independent winding

The complete schematic for the older version is in the attached PDF I downloaded from another forum, but again I can't find the post (sorry for not giving credit to the author)

EDIT: I found the post where the PSU schematic was posted

[Aldo22]

One of the differences is in the main rectifier; in the older version, D5 are two SMD diodes in parallel that tend to overheat (in fact, one of them in Aldo22's post is charred...)

I don't think the diode is charred.
I just linked the first photo of the 8V PSU that I found. He doesn't say anything about anything being charred.
https://www.eevblog.com/forum/testgear/new-hantek-dso2x1x-models/msg3515614/#msg3515614

The second photo (7V) is from my device.

[jovan_kineas]

Hello again, I didn't know there was such a version of the power supply, in any case my modification is for the first 8v version. since it's what mine had inside. Thanks for the diagram, I no longer need to go to the trouble of doing it.

[morgan_flint]

...
I don't think the diode is charred.
I just linked the first photo of the 8V PSU that I found. He doesn't say anything about anything being charred.
...

Maybe it's just a bit overheated or just problem of light reflection in the photo...

Anyway, if you search D5 in the other thread, you'll find some posts reporting problems with these diodes (for example, this one or this one).

BTW, I found the posts with the PSU schematics; edited my previous post to include the link for the older version and here is the link to the post with the schematic of the newer one (better design, in my opinion).

[jovan_kineas]

At my work I disassembled the Hantek DSO5202P that I have been using for almost 3 years and when I saw that its power supply did incorporate an output for a 12-volt fan, I decided to make a modification to the pcb of my DSO2D10 that I have at home. The Power Supply of this DSO5202P is a little larger but it seems to have fewer components, or perhaps not because the SMDs are soldered underneath since it is a single-sided pcb. This oscilloscope remains on 9 hours a day from Monday to Saturday. Whether it's hot or cold days, for 3 years it has worked well. I mean it has generated profits, I work in a company that only repairs macbooks and imacs. It is true that it is a little less noisy than the DSO2D10 but I like mine better. Of course there are better ones, like the Rigol 1054Z for example.

Sorry my bad english, i used Google Translator.

[Eula]

Hello,

I am a new owner of a DSO2C10 which, thanks to the great effort of DavidAlfa and many other people have selflessly dedicated many hours of their time, has easily become a DSO2D15.

The next thing I tried to do, but without any success, was to connect it to the PC.
There has been no way to get the USB recognized on any of the three computers I have tried it on. Neither with Win10 nor with Win7.
I have written to Hantek, but I have no confidence that they will respond.
So I'm trying all the solutions I can find on the forum and on the Hantek site, but so far no luck.

I changed the software version but that hasn't helped either. I followed the steps with Zadig 2.8 and it seems to recognize the device, even if it is as "unknown", but when I go on, it fails again, as if it was uninstalled.

I followed the steps with Zadig 2.8 and it seems to recognize the device, albeit as "unknown", but when I move on, it crashes again, as if uninstalling. 
Has anyone else had this happen, any ideas on where to tackle the problem.

For reference, the software version is 1.03.00(230831.00); firmware 3205 and hardware 003.002.001.000.000.000.000.001 (000 before the "conversion").

Thank you all very much.

[Aldo22]

@Eula
Have you removed the USB stick on the front?
Have you tried PyVisa and/or Linux? https://pyvisa.readthedocs.io/en/latest/

[DavidAlfa]

Zadig can take a while to install on slow computers!

[jovan_kineas]

One of the differences is in the main rectifier; in the older version, D5 are two SMD diodes in parallel that tend to overheat (in fact, one of them in Aldo22's post is charred...), and in the newer version is a bigger through-hole device.

In the older version, there was additional filtering (L1-C7) in the +8V output (simplified schematic here), because the +5V output derived from there with a buck converter.

I remember somebody posted the schematic of the newer version, but I can't find the post. If I remember well, the +5V output comes from its own winding in the transformer (feedback to the primary from here), and +-7V has another center-tapered independent winding

The complete schematic for the older version is in the attached PDF I downloaded from another forum, but again I can't find the post (sorry for not giving credit to the author)

EDIT: I found the post where the PSU schematic was posted

In the diagram that you put C8, C10, C5, C4 and C2 do not have their values ​​specified, which makes me think and doubt that the rest is correct, fortunately I still have my notes from when I dismantled my power source so I better do I myself the diagram based on it. Probably the person who made that diagram made the measurements with the components still soldered on the PCB, which is obviously not reliable, while I dismantled component by component to modify a new PCB.

[Eula]

@Eula
Have you removed the USB stick on the front?
Have you tried PyVisa and/or Linux? https://pyvisa.readthedocs.io/en/latest/

Thanks for the quick responses, but I comment:

@Aldo22: Thanks for the suggestions. Yes, there is nothing connected on the front USB, I have also tried on Linux Mint, without success. I'm going to try PyVisa, see if there is more luck.

I will continue to investigate and if I succeed, I will leave the results here.

Regards

[Eula]

Zadig can take a while to install on slow computers!

Thanks for the quick responses, but I comment:

@DavidAlfa: Same to you, thanks a lot for your great work. And yes, Zadig is installed correctly on the computer (both versions, 2.7 and 2.. In fact, it seems that the DSO USB is recognized, but when trying to follow the steps it stops recognizing it again.
It is very frustrating.... because I have tried it on every computer I can get my hands on.....

I will continue to investigate and if I succeed, I will leave the results here.

Regards

[DavidAlfa]

What are you trying to do?
Zadig and fastboot drivers are only for FEL/recovery modes!
Read the FAQ Quick Glance section, there's a working driver for Win11 from R&S.

[Eula]

Thanks for the reply David.

The only thing I want is to be able to connect the DSO to the computer to manage it from there, without further pretensions, but the problem is that no computer recognizes it.
Nor does it work with any controller (Zebra, IO, etc).
As a curious thing, I have connected it through an old USB hub and then it identifies it as a measuring instrument, but it does not install or configure it, the error is the same. It is not "usable".

I will take a look at what you propose.

Thank you very much!!!

Edit:
Sorry David,

I didn't remember doing it, but my first step, after a lot of searching and reading the thread, to try to solve the problem was to go through that section and apply the patch that was supposed to fix it (I guess you mean this entry: ""If USB is not working properly (Drive not being recognized until pressing update), apply Hantek's USB fix."), but I was unsuccessful.

I'm still trying to solve the problem, because as expected, Hantek has not responded and the seller just asked me for a video and says he will deal with it with his technical support.

This is my first DSO and I would like to be able to see it on the PC monitor .... my old oscilloscope is a Hameg 203 which I am particularly fond of, but it falls short, but it has never given me any problems, something that can not be said of this one....

[Aldo22]

I have also tried on Linux Mint, without success.

But what exactly did you try?
If you simply connect the Hantek to the Linux-PC via USB and enter "lsusb -v" in the Linux shell, don't you get something like this (among other things)?

Code: [Select]

Bus 001 Device 005: ID 049f:505e Compaq Computer Corp. DSO2D15
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0        64
  idVendor           0x049f Compaq Computer Corp.
  idProduct          0x505e
  bcdDevice            5.02
  iManufacturer           1 undefined
  iProduct                2 DSO2D15
  iSerial                 3 CN2328029051205
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0027
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          4
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              500mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       254 Application Specific Interface
      bInterfaceSubClass      3 Test and Measurement
      bInterfaceProtocol      0
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               2

(I don't know exactly why it identifies as Vendor "Compaq")

[Eula]

Good morning.

Thank you all very much for the help. Finally the problem was in the USB cable I was testing with. It works fine with my printer, but for some reason, it doesn't work with the DSO.
Using the original Hantek cable I was able to connect correctly.   

I apologize for any inconvenience this may have caused.

By the way, Aliexpress seller support and Hantek support have contacted me and suggested to try the original cable.   

Let's say that this is an "X-file".... 

Now what I have to try to solve is the response of channel 2 on square wave signals....

No matter which probe I try, it always shows the same.

Here are some screenshots at 1kHz and 20kHz.


Regards

[Aldo22]

No idea.
Did you compensate the probe?
What if you change the coupling from AC to DC?
What happens if you change the probe attenuation (1x -> 10x)?

[Eula]

No idea.
Did you compensate the probe?
Yes, it was the first thing I did. This channel does the same thing with any probe, even connecting the crocodile cable that Hantek delivers with the device. That's why I think it's a channel 2 problem.

What happens if you change the coupling from AC to DC?
Nothing changes, the signal shows the same

What happens if you change the probe attenuation (1x -> 10x)?
I have to adjust it again so that the signal shape is correct which is corrected, but when you go back to x1, you have to adjust again. It happens with any probe, with the cable, not needing calibration you can see the error perfectly, while on channel 1 it looks fine.
It is unquestionable that the problem is in channel 2 and has nothing to do with the probe.

Thanks for your help!

[DavidAlfa]

Did you compensate the probe?

Doesn't make sense when any probe works nice in CH1. Something seems wrong in CH2.
Try in different ranges, around 20mV/div (x1) or 200mV/div (x10) you'll hear the relay clicking.

Something might be wrong in the analog frontend, a component missing, or CX1 badly adjusted.
https://github.com/pecostm32/Hantek_DSO2000/blob/main/Schematics/Mainboard/Analog_Input_2.png

[Aldo22]

Doesn't make sense when any probe works nice in CH1. Something seems wrong in CH2.

All my questions don't really make sense. That's why I said I have no idea. 
I just thought he should check again before the diagnosis is that something is really broken on Ch2 of his new scope.
I mean after the experience with the USB cable...

[OLderDan]

After reading the FAQ I am still unsure exactly what I will need to do to change my dso2d10 to a dso2d15 when it arrives next week. Other than the ASCII readout change , do I simply type in the command from the PC software or follow the instructions where I make a file and manually type it's contents, or am I missing something?
edit: @davealpha, I watch David on eevblog YouTube so much I read your posts in a high pitched Australian accent!

[Aldo22]

After reading the FAQ I am still unsure exactly what I will need to do to change my dso2d10 to a dso2d15 when it arrives next week.

This is the easiest way to do it (by DavidAlfa):
https://drive.google.com/drive/folders/1AbaHXFGgBeKaUuzLmC5P5jtotScjxTgf

Simply copy the .upk file to a USB stick and select it in "Utility -> Update" on the scope.
Make a backup beforehand.