Error codes konica minolta

Code: C4002
Description:
PH communication error. When the PH relay board (PHRYB) is receiving data, a communication error is detected.
Causes:
• PH relay board (PHRYB) • MFP board (MFPB)
Remedy:
1. Turn OFF the main power switch, disconnect and then connect the power cord. Wait for 10 sec. or more after connect the power cord, and turn ON the main power switch. 2. Check the connector between MFPB CN6E-PHRYB CN8 for proper connection and correct as necessary. 3. Check the connector between MFPB CN5E-PHRYB CN9 for proper connection and correct as necessary. 4. Rewrite the firmware. 5. PHRYB ICP1 conduction check. 6. Replace PHRYB. 7. MFPB F2E conduction check 8. Replace MFPB.