Several attempts later, the toner test page has been detected & OK.
Printer turned off, after a few hours:
Printer: "No toner installed"
sch ....
Toner removed and reinstalled: "No toner installed"
sch ....
Toner removed and reinstalled: After the toner has been detected - Test Page OK.
Now I was taken aback.
Printer is turned off, switched on again:
Printer: "No toner installed"
sch ....
The games I have repeated several times have / get.
=> Toner runs today as "defective" back
