To know the compatible goods

Why some compatible parts, you think their quality is very well, And You have used them in a long time , haven’t any problem.
One day , you replace a another part. You find these parts make many troubles suddenly ,even use the new one can't solve the problem also.
Why like this .
First , let me to know what is compatible goods.
Compatible goods is the substitute for the new original goods.
People want the cheap parts than original goods .So the compatible product appear in Market.
But here many compatible goods in Market . Different with Genuine goods , The compatible goods have different quality , Because them from many many compatible manufacture.If some manufacture haven’t a good product condition to manufacture, the product quality may be poor. On the contrary, some manufacture can made some good quality goods .
But if you think the good quality product is good goods , I think you are wrong .
Because The machine have many parts , They cooperate with each other , so that the Print and copy duty can finish. If the good quality product have a compatible problem with another parts , I don’t think it is the best .
The good goods , which need a long life and a good effect , haven’t a compatible problem with other parts.
But most of compatible product have compatible problem. The question of the article top also a compatible problem , Because you have change another parts , the compatible problem follow .
So, how to solve the problem ? I just can said that haven’t a good way to deal, you just can change different manufacture parts to solve .
As you know , before a machine appear in Market , need many test.So that it can work in your office well. The parts compatible test,ect.
Many manufacture haven't a good test condition , so many compatible parts have some compatible problem.