Before I chuck these in the bin I wanted to have a go at dismantling and cleaning to see if it helped. They are about 5 years old and over the last few months they have begun to drift downwards while weighing. e.g. Weigh something at 100g and watch, and gradually the displayed weight decreases. Switch them on and zero them, and after a few seconds the display changes to 'negative load'.
There are 6 screws on the base of the unit. When they are all removed it is possible to wiggle and dislodged the base. However it cannot be removed because the weighing platform itself seems to be firmly attached to the base, and therefore is prevented from detaching because of the upper part of the unit. Logic would suggest that the weighing plate dislodges in some way (in the same way as slide-on control knobs on a cooker) but this does not appear to be the case. I have exerted a lot of pressure and it feels like any more pressure would just break something.
Does anyone recognise this type of fault? Is it fixable? Or is it time for the bin?
Thanks
Dougie