1.SC Codes 
43 
Error Name/Error Condition/Major Cause/Solution 
Potential sensor dirty (foreign object, such as toner, entering the probe window) 
  Check if the potential sensor probe is dirty. 
  Use a blower brush to clean the window of the potential sensor probe, then 
check the sensor again. 
  If this does not solve the problem, replace the potential sensor probe. 
 
Error Name/Error Condition/Major Cause/Solution 
Potential sensor output low error (K) 
Potential sensor output low error (C) 
Potential sensor output low error (M) 
Potential sensor output low error (Y) 
Potential sensor output low error (S) 
Vd(700) lesser than 500[-V] 
  Potential sensor probe connector disconnected 
  Potential sensor probe defective 
  Potential sensor board defective 
  Replace the potential sensor probe. 
 
Error Name/Error Condition/Major Cause/Solution 
The machine issues this SC if counter of SP7-987-001 is “3” 
  Error at motor startup/motor running normally 
When an error command from TDCU detected and if 1 is added to the SP7-
987-001 counter and the resulting value of SP7-987-001 is 3. 
Abnormal increase in PCU torque (overload due to the cleaning blade getting 
caught) 
Return to the normal torque by clearing the overload in the PCU. And then 
execute SP7-988-001 and reset counter SP7-987-001. 
 
Error Name/Error Condition/Major Cause/Solution 
  At motor startup/motor running normally 
When an error command from TDCU detected and if 1 is added to the SP7-
987-002 counter and the resulting value of SP7-987-002 is 3. 
Abnormal increase in PCU torque (overload due to the cleaning blade getting 
caught)