Error codes konica minolta

Code: C2558
Description:
Abnormally high toner density detected black TCR sensor. The TC ratio of the toner determined by the toner replenishment control is detected to be the predetermined value or over for consecutive times.
Causes:
• Developing unit/K • Toner cartridge/K • Sub hopper unit • Toner empty sensor/K (PZS/K) • MFP board (MFPB)
Remedy:
1. Reinstall developing unit/K. 2. Reinstall toner cartridge/K. 3. Check the connector between PZS/K-relay CN248-relay CN265-MFPB CN4E for proper connection and correct as necessary. 4. PZS/K I/O check, sensor check • Control signal: MFPB CN4E-12 (ON) • Location of electrical component: 17-C 5. Replace the developing unit/K. 6. Replace MFPB. 7. Replace the sub hopper unit.