1. If the powder supply motor of the copier does not turn or is damaged, please replace it;

2. If the powder supply port of the copier is blocked or blocked, take out the powder box and check the powder supply port;

3. The toner cartridge of the copier is not installed correctly. Reinstall or replace it with a new toner cartridge for testing.

4. The printer itself has quality problems or design defects.

Note: This kind of electronic products is professional, and it needs professional maintenance personnel to disassemble the machine for testing, so as to avoid unnecessary losses.