An Electronic Scale That Does Not Power Up Repaired
A customer working in a company that sells medical supplies brought this dead scale to my shop for repair. It is a very sensitive scale because it is used for measure very tiny and light things.
This is the model number and when the customer brought it for repair, it was already open.
The customer explained that the technician at the company tried to repair it but without any success.
When I took the top cover off I saw what the other technician has done. All these capacitors have been changed but that did not bring this device back to life.
As I powered up the device I could read the entire voltages fine and there was nothing wrong with that except it was not turning on. What could be the problem?
The only thing that came to mind is the power switch gone bad. So I started figuring out the connections of the on/off switch.
If you look at the photo you can see the configuration of that. All these lines tested fine except the on/off switch. It was faulty.
I was thinking about peeling off the buttons pad but there was a risk of damaging the other buttons in the process so instead I decided to add an external pulsed on/off switch.
The pulsed on/off switch was added and tested and seems like I forgot again to take a photo of the repair results. Any way, it was working fine.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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Note: You can check his previous repair articles in the link below: