• Code: SC320
• Description: Development power pack error 1: K An interrupt checks the status of the each power pack every 2 ms. This SC is issued if the BICU detects a short in the development DC charge for black, magenta, cyan, or yellow (or V = 0) for 500 ms (250 times).
• Remedy: • Development power pack defective • High voltage power supply defective • High voltage power supply harness defective • Development unit defective • IOB harness disconnected or defective • IOB defective 1. Disconnect the high voltage cable from Terminal B of the high-voltage supply board. 2. Attach a voltmeter to the terminal. 3. 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 "0" or nearly "0", check the high-voltage harness for defects and replace it if necessary. If replacing the harness does not solve the problem, 4. Test the resistance between the development unit terminal and the ground. If there is no resistance (0Ù) between the development unit and the ground, replace the development unit. 5. If there is no development PWM signal, replace the harness and/or IOB.

• Code: SC321
• Description: Development power pack error 2: M An interrupt checks the status of the each power pack every 2 ms. This SC is issued if the BICU detects a short in the development DC charge for black, magenta, cyan, or yellow (or V = 0) for 500 ms (250 times).
• Remedy: • Development power pack defective • High voltage power supply defective • High voltage power supply harness defective • Development unit defective • IOB harness disconnected or defective • IOB defective 1. Disconnect the high voltage cable from Terminal B of the high-voltage supply board. 2. Attach a voltmeter to the terminal. 3. 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 "0" or nearly "0", check the high-voltage harness for defects and replace it if necessary. If replacing the harness does not solve the problem, 4. Test the resistance between the development unit terminal and the ground. If there is no resistance (0Ù) between the development unit and the ground, replace the development unit. 5. If there is no development PWM signal, replace the harness and/or IOB.

• Code: SC322
• Description: Development power pack error 3: C An interrupt checks the status of the each power pack every 2 ms. This SC is issued if the BICU detects a short in the development DC charge for black, magenta, cyan, or yellow (or V = 0) for 500 ms (250 times).
• Remedy: • Development power pack defective • High voltage power supply defective • High voltage power supply harness defective • Development unit defective • IOB harness disconnected or defective • IOB defective 1. Disconnect the high voltage cable from Terminal B of the high-voltage supply board. 2. Attach a voltmeter to the terminal. 3. 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 "0" or nearly "0", check the high-voltage harness for defects and replace it if necessary. If replacing the harness does not solve the problem, 4. Test the resistance between the development unit terminal and the ground. If there is no resistance (0Ù) between the development unit and the ground, replace the development unit. 5. If there is no development PWM signal, replace the harness and/or IOB.

• Code: SC323
• Description: Development power pack error 4: Y An interrupt checks the status of the each power pack every 2 ms. This SC is issued if the BICU detects a short in the development DC charge for black, magenta, cyan, or yellow (or V = 0) for 500 ms (250 times).
• Remedy: • Development power pack defective • High voltage power supply defective • High voltage power supply harness defective • Development unit defective • IOB harness disconnected or defective • IOB defective 1. Disconnect the high voltage cable from Terminal B of the high-voltage supply board. 2. Attach a voltmeter to the terminal. 3. 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 "0" or nearly "0", check the high-voltage harness for defects and replace it if necessary. If replacing the harness does not solve the problem, 4. Test the resistance between the development unit terminal and the ground. If there is no resistance (0Ù) between the development unit and the ground, replace the development unit. 5. If there is no development PWM signal, replace the harness and/or IOB.

• Code: SC324
• Description: Development motor error 1: K The PLL lock signal remained HIGH or LOW for longer than the prescribed time for the development motor of the affected color.
• Remedy: • Development motor shaft locked, blocked by and obstruction • DRB (Drive Board) defective

• Code: SC325
• Description: Development motor error 2: M The PLL lock signal remained HIGH or LOW for longer than the prescribed time for the development motor of the affected color.
• Remedy: • Development motor shaft locked, blocked by and obstruction • DRB (Drive Board) defective

• Code: SC326
• Description: Development motor error 3: C The PLL lock signal remained HIGH or LOW for longer than the prescribed time for the development motor of the affected color.
• Remedy: • Development motor shaft locked, blocked by and obstruction • DRB (Drive Board) defective

• Code: SC327
• Description: Development motor error 4: Y The PLL lock signal remained HIGH or LOW for longer than the prescribed time for the development motor of the affected color.
• Remedy: • Development motor shaft locked, blocked by and obstruction • DRB (Drive Board) defective