Cause:

The machine issues the following SC codes when the machine ITB steering control mechanism cannot correct the position of the ITB to compensate for the belt shifting out of position during operation:

  • SC471-03 ITB position error 1
  • SC471-04: ITB position error 2
  • SC471-05: ITB position error 3
  • SC471-06: Belt centering sensor error

Solution:

The value of SP 2-920-002 (Steering Control Roller Stable Position of Steering Roller) displays the target setting (-20 ≤ SP Value ≤ +20) for the optimum position of the ITB that is used to reset the ITB to its optimum position with steering control after the lubricant application mode has been executed so that the ITB is positioned correctly for stable operation.

  • The current setting of SP2-920-002 and the setting of the steering plate during operation and before and after adjustment for any operation where lubricant was applied are recorded.
  • If the optimum position of the belt cannot be recovered, then that value of the setting should be passed to the product specialist in order to solve future problems.

  • SP2-920-002 (Steering Control Roller Stable Position of Steering Roller) displays the number of steps used in operation of the steering control motor that diagonally adjusts the position of the steering control roller to keep the belt at the initial position. The target setting for this SP code is "0". If the displayed setting is within range [-20 ≤ SP ≤ +20], the position can be controlled within ±2 mm.
  • This troubleshooting procedure is not required if the ITB has been replaced after the service life of the ITB has expired and no ITB-related SC code has been issued.