Rei Hashimoto Posted October 3, 2021 Share Posted October 3, 2021 Hello, My name is Rei. I am using Analog Discovery (Black one). Recently, I noticed Scope feature couldn’t work. The calibration was failure also. It showed following error message; “Check the connection!!” However, the connection is correct. AWG is failure too. Negative is saturated on the waveform. I think the hardware is broken. Please see the picture. Here is supply voltage; AVCC5V0 : 4.401V AVCC-5V5 :1.289V AVCC5V5 : 5.502V AVCC3V3 : 3.308V AVCC-3V3 :-3.278V AVCC-5V5 and AVCC5V5 are strange. For checking failure device, the power rail should be separated from analog block. After that, external tracking +/-5V will provide to analog. Could you please let me know where is jumper. And if you have any advice, please send it also. Link to comment Share on other sites More sharing options...
attila Posted October 4, 2021 Share Posted October 4, 2021 Hi @Rei Hashimoto The +5V5 looks good but not the -5V5 See figure 30https://digilent.com/reference/test-and-measurement/analog-discovery/reference-manual#user_voltage_supplies1https://digilent.com/reference/_detail/analog_discovery/int7.png?id=test-and-measurement%3Aanalog-discovery%3Areference-manual Here you have top and bottom layout with marker parts/pads. Link to comment Share on other sites More sharing options...
Rei Hashimoto Posted October 5, 2021 Author Share Posted October 5, 2021 Hi, Attila, Thank you for your advice. Here is good news. I removed FB6, 7 and 16. SC and AWG are well with External -5V regulator. It means that the issue is only negative supply. By the way, The positive supply,5V5 is no problem. On the other hands, AVCC-5V5 is still 0V. The negative supply is generated by ADP1612. Inverted pulse provide from ADP1612 SW pin. And it is only chopping for getting -5V5. D7 and C217 are good. I don't know what's happen on simple circuit. Do you have any advice? Link to comment Share on other sites More sharing options...
attila Posted October 5, 2021 Share Posted October 5, 2021 Hi @Rei Hashimoto I don't know where have you measured earlier... Is the -5V5 on C217 ok? Are the ferrites good? D7? L5? Link to comment Share on other sites More sharing options...
Rei Hashimoto Posted October 5, 2021 Author Share Posted October 5, 2021 I just found out the cause of failure. Please see the picture. Yello : C217, Blue : D7, Anode. The anode waveform seems to be ok. It comes switching. However, AVCCC-5V is wrong. And I checked L5. L5 is completely opened. L5 might be damaged. It should be replacement. I would like to say "Thank you for your help." Link to comment Share on other sites More sharing options...
attila Posted October 5, 2021 Share Posted October 5, 2021 Hi @Rei Hashimoto I'm glad to hear the problem is isolated. I hope it will work after replacing the diode. Link to comment Share on other sites More sharing options...
Question
Rei Hashimoto
Hello,
My name is Rei.
I am using Analog Discovery (Black one).
Recently, I noticed Scope feature couldn’t work.
The calibration was failure also. It showed following error message; “Check the connection!!”
However, the connection is correct.
AWG is failure too. Negative is saturated on the waveform.
I think the hardware is broken.
Please see the picture.
Here is supply voltage;
AVCC5V0 : 4.401V
AVCC-5V5 :1.289V
AVCC5V5 : 5.502V
AVCC3V3 : 3.308V
AVCC-3V3 :-3.278V
AVCC-5V5 and AVCC5V5 are strange.
For checking failure device, the power rail should be separated from analog block. After that, external tracking +/-5V will provide to analog.
Could you please let me know where is jumper.
And if you have any advice, please send it also.
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