OKI MB790MFP Error Codes list and solutions – Compatible Printer model: OKI MB790MFP – OKI MB790MFP Error Code description: Code: 30.01 … 30.05 Description: Defective print cartridge or smart chip. Possible mechanical problem or modified cartridge for toner refilling. Troubleshooting Guides: Replace the print cartridge. Code: 31.01 Description: Defective print cartridge or smart chip. Possible […]