How to solve the problem---“cover is open”?

When you use SUPVAN tube printer, it shows “cover is open”, how to solve this problem?most likely because the white label is missing in this position.when the cover is not tight, you can’t print normally.

You can use one black electrical tape ,cut a piece about 2mm,stick a circle above the position ,so easy!

　　Please note:

　　* Don’t stick too much, one circle is enough.

　　*This method is applicable to SUPVAN tube printer TP70E, TP76E, TP80E.