First, check whether the power line and signal line are in good contact. If there is no problem, try adjusting the screen brightness or definition settings.If it still doesn't work, maybe[Detailed]
When the fax machine I just bought was used for the first time, I found that the handwriting of receiving fax and copying was very unclear. The seller said that this was the effect. He refused to return or replace the goods, and was speechless. The fax machine is still sleeping up to now.