Error codes konica minolta

Code: C4501
Description:
Laser malfunction. • SOS signal is not detected even after the lapse of a given period of time after starting the laser output. • SOS signal is not detected for a given period of time during printing or IDC sensor adjustment.
Causes:
• PH unit • PH relay board (PHRYB) • MFP board (MFPB)
Remedy:
1. Check the connector between the PH unit-PHRYB CN10 for proper connection and correct as necessary. 2. Replace the PH unit. 3. PHRYB ICP2 conduction check. 4. Replace PHRYB. 5. Replace MFPB.