释放双眼，带上耳机，听听看~！
04501 Print head test tool error
Description
Fault condition: Printhead test tool sequence did not finish properly.
Possible cause: Printhead not correctly adjusted in printhead tool (M&L).
Operator actions: Switch the printer Off and On for restart.
Tests / Checks
1 Switch the printer Off and On.
2 Check the grey printhead data cable.
Check if it makes contact with the printer frame (cable locally stripped)
3 Check the printhead.
