I have a Hantek2D72 and was having a problem with it. After turning the device on there is no displayed measurement value on the screen, the only thing that is displayed is the connection diagram and the measurement type. i have updated the firmware on it and this did not fix the problem. any help is would be appreciated.
@Jing replaced the crystal with a 4MHz 18pF one and am still experiencing the issue. I borrowed another multimeter and measured the two outer terminals of position 1 on the transformer in your earlier image and there was 0V across them. Why would a transformer be fed 3.5V DC voltage?
I'm at a loss here. Not sure what components to replace. It definitely seems like some components that manage these oscillations have failed and need to be replaced. Without making a detailed schematic breakdown and modelling, I'm not sure which ones.
Satur9 replied at 2023-7-6 23:57
I checked the crystal and it is definitely not operating correctly. Attached is an image of measurin ...
Dear Sir，You can replace a 4M crystal oscillator.
Test again for 1,2 in the figure below. 1 is DC voltage, 2 is AC voltage, see if this transformer has 3.5V.
This post contains more resources
You have to Login for download or view attachment(s). No Account? Register
I checked the crystal and it is definitely not operating correctly. Attached is an image of measuring it with another scope. I also couldn't detect any voltage across C46.
This post contains more resources
You have to Login for download or view attachment(s). No Account? Register
Post time 2023-2-1 09:01:33
Favorites
Shares
Collection
Post time 2024-3-17 05:14:43
Author