LBP6020 LBP6030 LBP6200d LBP6230dw hardware test
The hardware test without using PC.
The test for printer engine works like this - it works with some other models as well, but I have no tried.
Open and close the delivery tray five
times continuously with the power switch
on. (The time of opening and closing the
delivery tray is approx. 2 sec or less.)