Ricoh Aficio MP C5503 A3 Color Laser Multifunction Printer. How to fix error code sc312-01 please?

Question edited for clarity.

Error Codes > Ricoh > MPC4503SP > Code SC312-01

PrintCopy .info
https://printcopy.info > brand=Ricoh > code=SC312-01
Description: Charge Roller HVP_CB Output Error (K) Charging AC is set to ON at the standard speed, and the FB voltage of the charging AC of each color is ...

Error Codes > Ricoh > MPC306 > Code 312-01

PrintCopy .info
https://printcopy.info > brand=Ricoh > code=312-01
Code: 312-01; Description: Charge roller feed back voltage error: Bk. The feedback voltage of the charge AC for each color is 0.3V or less for consecutive ...

Ricoh C4503 C5503 C6003 series Error Codes

San Diego Copier Repair
https://www.sandiegocopierrepair.com > ricoh-c4503-c5...
Ricoh MP C3003 C3503 C4503 MP C5503 MP C6003 Error Codes ... SC 312-01 Code - Charge roller HVP_CB output error K.

..