• Code: SC268
• Description: Optical unit sensor error
  At power on, one of the two temperature sensors in the optics unit detected a temperature lower than -10°C. -or- It detected a temperature higher than 80°C.
• Causes: • Thermistor disconnected (causes extremely low temperature reading) • Thermistor damaged and short circuited (causes extremely high temperature reading) • VBCU defective

• Code: SC270
• Description: Skew Control Upper Lower Limit: Y
  The pulse total for Yellow skew control is not within the prescribed range.
• Causes: • ITB not installed correctly. • ITB defective • Optical unit installed incorrectly • Optical unit defective

• Code: SC271
• Description: Skew Control Upper Lower Limit: M
  The pulse total for Magenta skew control is not within the prescribed range.
• Causes: • ITB not installed correctly. • ITB defective • Optical unit installed incorrectly • Optical unit defective

• Code: SC272
• Description: Skew Control Upper Lower Limit: C
  The pulse total for Cyan skew control is not within the prescribed range.
• Causes: • ITB not installed correctly. • ITB defective • Optical unit installed incorrectly • Optical unit defective

• Code: SC285
• Description: MUSIC Continuous Failure
  The MUSIC adjustment failed after four attempts.
• Causes: • Fusing belt installed incorrectly • Fusing belt surface scoured, scratched • MUSIC sensors dirty, defective

• Code: SC300
• Description: Drum charge corona wire error: K
  The output of the charge corona wire of the black PCU is abnormal.
• Causes: • CGB power pack connection loose, broken defective • Check CGB power pack connection to BCU • CGB power pack defective • BCU defective • Replace OPC drum

• Code: SC301
• Description: AC charge output error: M
  An interrupt checks the status of the power pack every 10 ms. This SC is issued if the VBCU detects a short in the AC charge for M, C, Y.
• Causes: • Disconnect the high voltage cable from Terminal C of the multiple high-voltage supply board. • Attach a voltmeter to the terminal. • If there is no output from the terminal, replace the high voltage power supply. -or- • If there is output from the terminal, test the resistance between the high voltage cable and the ground. If resistance is nearly "0", check the high-voltage harness for defects and replace it if necessary. • Test the conductivity between the OPC unit and the ground. If there is no conductivity between the OPC unit and ground, replace the OPC unit. • If there is no charge PWM signal, replace the harness and/or VBCU.

• Code: SC302
• Description: AC charge output error: C
  An interrupt checks the status of the power pack every 10 ms. This SC is issued if the VBCU detects a short in the AC charge for M, C, Y.
• Causes: • Disconnect the high voltage cable from Terminal C of the multiple high-voltage supply board. • Attach a voltmeter to the terminal. • If there is no output from the terminal, replace the high voltage power supply. -or- • If there is output from the terminal, test the resistance between the high voltage cable and the ground. If resistance is nearly "0", check the high-voltage harness for defects and replace it if necessary. • Test the conductivity between the OPC unit and the ground. If there is no conductivity between the OPC unit and ground, replace the OPC unit. • If there is no charge PWM signal, replace the harness and/or VBCU.