• Code: SC322
• Description: Laser Synchronization Error
  The laser synchronization signal (DETP) cannot be detected by the synchronization detector even if the laser diodes are activated and the polygon mirror motor is rotating normally.
• Causes: • Laser synchronization detector harness disconnected or defective • Laser synchronization detector is installed incorrectly out of position • LDB board, Polygonal mirror motor control PCB defective. After the CPU issues the LD ON command, the LD OFF signal remains HIGH and the laser diodes do not fire • LDB board, Polygonal mirror motor control PCB defective. After the CPU issues the LD ON command, the LD OFF signal goes low, but the laser diodes still do not fire

• Code: SC323
• Description: Excessive LD Drive Current
  The value of the LD driver offset current is over the allowed current (about 90 mA).
• Causes: • Poor LDB board harness connection • LDB defective • LD unit defective

• Code: SC335
• Description: Polygonal Mirror Motor Error 1
  The polygonal mirror motor does not reach its operating speed within 20 s after the polygonal mirror motor turns on, or the polygonal mirror motor speed is changed. (The XSCRDY signal does not go LOW for active.)
• Causes: • Poor connection between polygonal mirror motor and I/F harness • Polygonal mirror motor, LDB, or polygon mirror motor control PCB defective • IPU defective

• Code: SC336
• Description: Polygonal Mirror Motor Error 2
  The XSCRDY signal (polygon mirror motor ready signal) does not go HIGH (inactive) within 20 s after the polygonal mirror motor switches off.
• Causes: • Poor connection between the polygon mirror motor control PCB and I/F harness • Polygonal mirror motor, polygon mirror motor control PCB, or LDB board defective • IPU defective

• Code: SC337
• Description: Polygonal Mirror Motor Error 3 (SCRDY Signal Error)
  While the polygonal mirror motor is rotating normally, the lock signal (XSCRDY or polygon mirror motor ready signal) is detected HIGH (inactive) even though the motor has not been switched off nor has the motor rotation been changed.
• Causes: • Electrical noise interfering with the lock signal (XSCRDY) • Poor connection between polygonal mirror motor control PCB and I/F harness • Polygonal mirror motor or LDB defective

• Code: SC338
• Description: Polygonal Mirror Motor Error 4
  The XSCRDY signal (polygon mirror motor ready signal) does not stabilize within 20 s when: • The motor is switched ON or OFF • After the rotation of the motor has been changed
• Causes: • Poor connection between the polygonal mirror motor control PCB and the I/F harness • Polygonal mirror motor or LDB defective

• Code: SC340
• Description: TD Sensor Error 1 (Vt Measurement Error)
  The TD sensor output voltage is detected less than 0.5 V or more than 4.0 V for 10 continuous copies.
• Causes: • TD sensor defective • TD sensor harness defective • TD sensor connector defective • IOB defective • Toner supply defective; check the toner supply path from the toner bank through to the hopper • BCU defective

• Code: SC341
• Description: TD Sensor Error 2 (TD Sensor Control Voltage Abnormal)
  One of the following TD sensor output voltages is detected during TD sensor initial setting. • Less than 2.5 V when the maximum PWM (255) is applied to the TD sensor. • 2.5 V or more when minimum PWM (0) is applied to the TD sensor. NOTE: When an abnormal condition is detected, .0. is displayed for SP2906 (Vcont Manual Setting).
• Causes: • TD sensor defective • TD sensor harness defective • TD sensor connector defective • IOB defective • Toner supply defective; check the toner supply path from the toner bank through to the hopper • BCU defective