How to deal with the flashing of CH light in sharp AR2048S copier?

Two states of common faults of CH lamp:

1.CH light is always on: the front or side door of the copier is not closed properly, or the sensor at the front or side door is damaged;

2.？ CH light flashes: the toner cartridge is unrecognizable or the developing cartridge is not installed. Open the door, take out the toner cartridge and reinstall it. If not, it is recommended to replace the toner cartridge and test it. If a new machine is installed, the carrier will be put in place and the developing magnetic roller will not rotate.