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I can’t read the polarity on my coby mid9742 The paint has worn off so its hard to read and I got a universal charger to charge it but I want to set polarity right. can anyone help me?

Hi, Your adapter needs to be set at 5V DC +ve centre pin of plug. Here is an image of the power port taken from your tablet’s user manual. You will see that it shows the +ve as being in the centre and the -ve as the outside of the DC plug. (Click on the image to enlarge it for better viewing).