These are countermeasures for solving other mechanical problems with the recurrence of SC741 series codes that may occur during these troubleshooting procedures.

SC471-01

Belt Position Ready Timeout

 

The machine issues this error during normal operation when ITB steering control fails to move the belt within the 400 sec. prescribed by SP2-920-013 (SP 2-920-013: Steering Control Roller Timeout of Belt Ready). If the machine issues this SC during the troubleshooting procedures described above, this means the steering control failed to position the belt within 105 sec. after the SP code was changed from "400" to "105".

 

The ITB was not re-installed correctly.

 

Remove the ITB, re-install it correctly, and then do the lubricant application SP 2-310-00 (Force Apply Lubricant Belt Cleaning)

SC471-02

Belt Centering Roller HP Error

 

There is a problem in the steering control mechanism.

 
  • The wire that controls steering is kinked, has slipped off the pulley, or is not set correctly.
  • The belt centering HP sensor harness is loose, broken, defective, or the sensor is defective.
  • The belt centering motor harness is loose, broken, defective, or the motor is defective.
 
  • Cycle the machine off/on.
  • If the problem persists, remove the ITB unit, remove the belt, and then check the steering control mechanism wire, pulley, sensor and motor harness connections.

SC471-03

ITB Position Error 1

 

The belt centering sensor detected that the belt has slipped out of position ±2mm.

Note: This SC is logged, not displayed.

 

The belt has slipped out of position after shipping from the factory, or the main machine has not been leveled correctly.

 

No procedure is required. The purpose of this SC code is used for analysis of SC471-04 and SC471-05 described below. It indicates whether the belt is frequently slipping out of position during daily use or if there has been a sudden development of the belt slipping out of position easily.

SC471-04

ITB Position Error 2

 

The front edge of the belt is slipping out of position.

SC471-05

ITB Position Error 3

 

The rear edge of the belt is slipping out of position.

 
  • SC471-04 can occur if the belt positioning lever is not completely up and locked in place.
  • These errors may indicate that the belt has slipped out of position after shipping from the factory, or the main machine has not been leveled correctly.
  • The belt centering sensor harness may be loose, broken, defective, or the sensor may be defective.
 
  • Remove the ITB unit, remove the belt, and then check the belt centering sensor.
  • Carefully, re-install the ITB
  • Be sure to do SP2-310-001 (Force Apply Lubricant Belt Cleaning) after re-installing the ITB.

SC471-06

Belt Centering Sensor Error

 

There is a problem with the belt centering sensor readings.

 
  • The belt centering sensor harness is loose, broken, defective, the sensor could be defective, or something (a scrap of paper) could be interfering with operation of the sensor.
  • The ITB is slipping too far to the front or too far to the rear.
  • The lever of the belt centering sensor is riding up out of position.
 
  • Replace belt centering sensor
  • Check the belt centering unit sensor and make sure that it is installed correctly. Make sure that the leading edge of the lever is not riding up onto the surface of the ITB as shown in the illustration below.
  • After re-installing the ITB, be sure to do SP2-310-001 (Force Apply Lubricant Belt Cleaning) after re-installing the ITB.