Main tray Up/Down motor malfunction
<When FS-526 is installed> • The main tray top surface sensor (PS4) is turned neither ON nor OFF even after the set period of time has elapsed while the main tray lift motor (M5) is energized. • The staple paper exit top surface sensor (PS7) is turned neither ON nor OFF even after the set period of time has elapsed while the main tray lift motor (M5) is energized.