SC8xx: Overall System 
 
492 
No.  Type  Details (Symptom, Possible Cause, Troubleshooting Procedures) 
SC878-20  D  Random number test error 
An error was detected when a random number table was generated during a self-test. 
TPM is defective 
•  Turn the main power OFF/ON. 
•  Replace the controller board if the SC occurs again. 
 
No.  Type  Details (Symptom, Possible Cause, Troubleshooting Procedures) 
SC878-21  D  DESS self-test error 
The power-on self-
test for TPM failed at startup when the controller encryption software was 
tested. 
TPM firmware or CPU is defective 
•  Turn the main power OFF/ON. 
•  Replace the controller board. 
 
No.  Type  Details (Symptom, Possible Cause, Troubleshooting Procedures) 
SC880-00  D  MLB error 
Reply to MLB access was not returned within a specified time. 
MLB defective 
•  Replace the MLB. 
•  Remove the MLB. 
 
No.  Type  Details (Symptom, Possible Cause, Troubleshooting Procedures) 
SC881-01  D  Management area error 
•  A problem was detected in the software 
•  This error may even occur is an IC card option is not installed. 
•  This is caused by accumulation of abnormal authentication information in the software. 
(User operation will not directly cause it.) 
•  At login 
Example: When a job is sent to the printer/when logged on from the operation 
panel/when logged on from a Web browser 
Cycle the main power off and on. 
 
No.  Type  Details (Symptom, Possible Cause, Troubleshooting Procedures) 
SC899-00  D  Software performance error (signal reception end) 
  Unknown software error occurred. 
Occurs when an internal program behaves abnormally. 
In the case of a hardware defect