Euronics Automatic Soap Dispenser Repair -2
The second unit of the Euronics automatic soap dispenser has now been repaired. Detailed photos were already shared in the previous article, so here, details regarding the further investigation of the fault are being shared.
This 2nd unit is checked, getting 6v on PCB Power connector. on Leaf switch I am getting Input 6v but there is no O/p.
In the image above, I have marked the track running from the power source to the Leaf switch and from the switch to the LDO. This LDO supplies voltage to the entire circuit, with an input of 6V and an output of 3.3V.
Now it is time to inspect the leaf switch unit. The wire might be broken.
To investigate further, the silicone glue was removed from the unit, and it was found that the PCB was completely damaged.
Now, I need to remove the entire switch unit for further inspection. I carefully removed the three screws and took out the PCB.
I Cleaned the PCB using IPA & this is the condition of the PCB
The solder points on this PCB aren’t melting, likely due to some kind of coating.
I gently abraded the top layer with my micro-grinder and removed the leaf switch from the PCB for the testing. I found Outside of the PCB switch doing his job.
So I repaired the PCB tracks using thin copper wire. & tested for working, now it is working fine.
After the job I put the PCB back to his location.
The unit was assembled for testing, and it is now working properly. Hot glue was applied to the PCB, and the unit is now this 2nd unit is ready for pickup.
Now A question for my fellow members: Could someone explain why one terminal of this switch is connected to ground? Why won’t it short-circuit when the switch is pressed?
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
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Note: You can check his previous repair articles on USB WIFI DONGLE REPAIRED
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