• Code: 337
• Description: Polygon motor error 3: XSCRDY signal error
  The XSCRDY signal did not go HIGH (Inactive) after the polygon motor had been rotating normally for 200 ms.
• Causes: • Polygon motor drive board I/F harness loose, disconnected, or damaged • Polygon motor drive board defective • Polygon motor defective

• Code: 338
• Description: Polygonal Mirror Motor Error 4: Unstable Timeout
  The XSCRDY signal is detected LOW) (Active) after the polygonal mirror motor switches on, but the signal is not detected LOW after 1 s has elapsed, and not detected after another 500 ms has elapsed.
• Causes: • I/F harness of the polygonal mirror motor disconnected or defective. • Polygonal mirror motor or polygonal mirror motor driver defective. • Polygonal mirror motor drive pulse is not output incorrectly.

• Code: 350
• Description: ID sensor pattern test error
  One of the following readings occurred 10 times in the ID sensor output when the ID sensor pattern was checked: 1) Vsp ≥ 2.5V 2) Vsg ≤ 2.5V 3) Vsp = 0V 4) Vsg = 0V
• Causes: • ID sensor defective • ID sensor connector defective • Poor ID sensor connector connection • I/O board (IOB) defective • Poor writing of ID sensor pattern on the drum • High voltage supply board defective • ID sensor dirty

• Code: 351
• Description: ID sensor Vsg test error
  When the ID sensor was checked, the ID sensor output voltage was 5.0V while the PWM signal input to the ID sensor was 0.
• Causes: • ID sensor defective • ID sensor connector defective • Poor ID sensor connection • I/O board (IOB) defective • Scanning system defective • High voltage supply board defective • ID sensor dirty • Defect at the ID sensor pattern writing area of the drum

• Code: 352
• Description: ID sensor, pattern edge detect error
  The ID sensor pattern edge voltage is detected to be not 2.5V twice consecutively during an 800 ms interval.
• Causes: • ID sensor defective • ID sensor connector defective • Poor ID sensor connector connection • I/O board (IOB) defective • High voltage supply board defective • Dirty ID sensor • Defect at the ID sensor pattern writing area of the drum

• Code: 353
• Description: ID sensor, LED current abnormal at initialization
  One of the following ID sensor output voltages is detected at ID sensor initialization. 1) Vsg < 4.0V when the maximum PWM input (255) is applied to the ID sensor. 2) Vsg ≥ 4.0V when the minimum PWM input (0) is applied to the ID sensor.
• Causes: • ID sensor defective • ID sensor harness defective • ID sensor connector defective • Poor ID sensor connection • I/O board (IOB) defective • Exposure system defective • High voltage supply board defective • Dirty ID sensor

• Code: 354
• Description: ID sensor timeout abnormal at adjustment
  Vsg falls out of the adjustment target (4.0 ± 0.2V) at the start of Vsg checking after 20 seconds
• Causes: • ID sensor defective • ID sensor harness defective • ID sensor connector defective • I/O board (IOB) defective • Exposure system defective • Poor ID sensor connector connection • High voltage supply board defective • Dirty ID sensor

• Code: 390
• Description: TD sensor error: Test value abnormal
  The TD sensor output voltage is less than 0.5V or more than 5.0V after 10 consecutive times during copying.
• Causes: • TD sensor defective • TD sensor not connected or connector damaged • Poor connection between the TD sensor and the I/O board (IOB) • I/O board (IOB) defective • Toner supply defective