A Simple Fix To A Heavy Duty Scale With A Flickering Display
A restaurant owner brought this scale for repair. He said that the display is flickering and the weighing is not accurate.
These are the specs of the scale and it weight up to 150KG and this is being used in the restaurant to weight meat.
I have worked on such scales before but usually had to do with power issue only but when it comes to not giving the accurate weight that is something new to me but I was willing to give it a try.
That is a big size scale and hardly fit on my repair table so that was not an easy situation but I managed.
I powered on the scale and sure enough it came on but as the customer said, the display was flicking and of course it is hard to show that with a photo.
The AC charging light was on but it was also flicking which gave me the indication that is has a power or charging issue.
I tested the power coming through the charging port and it was down to 5DC and that is not OK. I disconnected the power charger and tested, this time it gave me 12 DC volts and that is what I was expecting but it seems like something was putting the voltage reading down causing the display to flicker since it was not getting the right voltage to operate.
The only suspect in mind was the battery so I disconnected that and powered the scale through the 12 power supply and guess what? There was no flicking this time, the scale was accurate and the display was fully there so the main problem was the battery.
As seen in the photo, I was getting the right voltage and now it is time to replace the battery and call the customer for pick up.
When testing the battery with a voltmeter, there was no reading whatsoever. I usually shake the battery and hear the sound coming out of it. If I hear any noise coming out, that is an indication of a dry up battery and that is what I got.
I installed a new battery and charged it for while then tested the scale and it was working as it should. I called the customer for pick up and he was glad with the outcome because this was an expensive to replace and to him it was worth the fix.
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 article on A Faulty Controller Checked But Was Not Repaired