Only 1 channel working

Dual channel oscilloscope

Only 1 channel working

Postby jatheman » Tue Jun 18, 2019 11:24 am

Hi.
Only one of the channels on the Wave2 is working. The other one is only showing noise. Nothing happens when I connect the probe to it.
The other one is working just fine an d I have managed to calibrate it.

I have the DIY kit
jatheman
 
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Re: Only 1 channel working

Postby jye1 » Tue Jun 18, 2019 10:14 pm

Can you post more details? Did you check with or without probe? Try touching the center conductor of the BNC connector with a screw driver and check if you can see any activity on screen. Also make sure the voltages at analog board check points are correct.
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Re: Only 1 channel working

Postby jatheman » Wed Jun 19, 2019 10:03 pm

Hi.
Yes, i did check it with and without the probe. I even switch the probes but same result.
I have tried to touch the center of the BNC Connector but no respons on ch1.
Ihave checked all the voltages and they are within the limits.
I have attached some images of the screen showing the "noise" on ch1 and screen without the analog board and also front and back of the analog board.
For Informationen, I have double check all the components that I have soldered and they are correct.
Attachments
15609817422958981903365454475187.jpg
Without analog Board
20190619_234420.jpg
Analog Board back
20190619_234404.jpg
Analog Board front
20190619_224908.jpg
Screenshot
jatheman
 
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Re: Only 1 channel working

Postby jye1 » Sat Jun 22, 2019 1:54 am

Thank you for the details. It looks the connection from Ch1 analog channel output to the ADC input on the main board was open somewhere. The screen displayed CH1 waveform as if no analog board connected. It is suggested to check the connection from the point V14 at analog board to U1 pin10 on the main board. Please refer to the schematics.
jye1
 
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Re: Only 1 channel working

Postby jatheman » Sat Jun 22, 2019 10:05 am

Ok, thanks.
I will try that.
jatheman
 
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Re: Only 1 channel working

Postby jatheman » Sat Jun 22, 2019 11:50 pm

Hi.
Problem solved.
There was a bad soldering from the factory on the pin connector between analog and main board.
Everything works fine.
Attachments
CONNECTION.PNG
jatheman
 
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Re: Only 1 channel working

Postby jye1 » Sun Jun 23, 2019 12:59 pm

It's the problem was found. For not fully assembled boards solder joints like this that are easy to access are not included in the production tests. They relies on DIYers to fix if problem arises.
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