M.15.6.1 Maintenance - Check Pattern
M.15.6.2 Maintenance Menu - Check Font Display
M.15.6.3 Maintenance Menu - Check Touch Panel
M.15.6.4 Maintenance Menu - Calibrate Touch Panel
M.15.6.5 Maintenance Menu - Check COM1/COM2/LAN
M.15.6.6 Maintenance Menu - Memory Info
M.15.6.7 Maintenance Menu - Color Tone