• Code: SC 380
• Description: Black development motor error When the motor speed is within the target level, the motor sends a lock signal (High to Low at CN214-5) to the BCU. SC380 is detected under the following conditions: • The Lock signal stays High 2 seconds after the motor turns on. • The Lock signal stays Low 2 seconds after the motor turns off. • The Lock signal stays High for more than 2 seconds while the motor is on.
• Causes: • Defective motor • Defective BCU
• Remedy: 1. Turn the main switch off and on. 2. Replace the motor. 3. Replace the BCU.

• Code: SC 381
• Description: Color development motor error When the motor speed is within the target level, the motor sends a lock signal (High to Low at CN214-5) to the BCU. SC380 is detected under the following conditions: • The Lock signal stays High 2 seconds after the motor turns on. • The Lock signal stays Low 2 seconds after the motor turns off. • The Lock signal stays High for more than 2 seconds while the motor is on.
• Causes: • Defective motor • Defective BCU
• Remedy: 1. Turn the main switch off and on. 2. Replace the motor. 3. Replace the BCU.

• Code: SC 385
• Description: ID sensor VSG adjustment error Vsg is the out of adjustment range during a process control self-check. Adjustment range: 4.0 ± 0.5V
• Causes: • Defective ID sensor • Dirty ID sensor • ID sensor disconnected • Dirty drum (cleaning incomplete)
• Remedy: 1. Turn the main switch off and on. 2. Clean the ID sensor and adjacent parts. 3. Check the drum cleaning condition. 4. Check the ID sensor connector. 5. Replace the ID sensor.

• Code: SC 386
• Description: Development gamma error K Any of the following conditions happens three consecutive times: . When the development gamma is out of the following range: 0.3 <Y> 6.0 . When Vk is out of the following range: -150V <Y>150V . Development gamma calculation error
• Causes: • Unsuitable toner density • Toner supply mechanism problem • Laser exposure problem • Image transfer problem
• Remedy: 1. Turn the main switch off and on . 2. Check the process control self-check result (SP3-975). If the result is not .1., fix the problem according to the table in section 4.1.2. 3. Print a full color image by disabling SC detection (SP5-809-001) and check if the image quality is OK. If the image quality is not OK, fix the problem. Then, enable the SC detection again.

• Code: SC 387
• Description: Development gamma error Y Any of the following conditions happens three consecutive times: . When the development gamma is out of the following range: 0.3 <Y> 6.0 . When Vk is out of the following range: -150V <Y>150V . Development gamma calculation error
• Causes: • Unsuitable toner density • Toner supply mechanism problem • Laser exposure problem • Image transfer problem
• Remedy: 1. Turn the main switch off and on . 2. Check the process control self-check result (SP3-975). If the result is not .1., fix the problem according to the table in section 4.1.2. 3. Print a full color image by disabling SC detection (SP5-809-001) and check if the image quality is OK. If the image quality is not OK, fix the problem. Then, enable the SC detection again.

• Code: SC 388
• Description: Development gamma error C Any of the following conditions happens three consecutive times: . When the development gamma is out of the following range: 0.3 <Y> 6.0 . When Vk is out of the following range: -150V <Y>150V . Development gamma calculation error
• Causes: • Unsuitable toner density • Toner supply mechanism problem • Laser exposure problem • Image transfer problem
• Remedy: 1. Turn the main switch off and on . 2. Check the process control self-check result (SP3-975). If the result is not .1., fix the problem according to the table in section 4.1.2. 3. Print a full color image by disabling SC detection (SP5-809-001) and check if the image quality is OK. If the image quality is not OK, fix the problem. Then, enable the SC detection again.

• Code: SC 389
• Description: Development gamma error M Any of the following conditions happens three consecutive times: . When the development gamma is out of the following range: 0.3 <Y> 6.0 . When Vk is out of the following range: -150V <Y>150V . Development gamma calculation error
• Causes: • Unsuitable toner density • Toner supply mechanism problem • Laser exposure problem • Image transfer problem
• Remedy: 1. Turn the main switch off and on . 2. Check the process control self-check result (SP3-975). If the result is not .1., fix the problem according to the table in section 4.1.2. 3. Print a full color image by disabling SC detection (SP5-809-001) and check if the image quality is OK. If the image quality is not OK, fix the problem. Then, enable the SC detection again.

• Code: SC 390
• Description: Development Bias output error The high voltage supply board (C/B) monitors the circuit and detects abnormal conditions such as a voltage leak or no output condition. If this happens, the high voltage supply board sends an error signal (High to Low at CN204- A18) to the BCU. The BCU monitors this signal every 2 ms and generates this SC code when the error condition occurs 250 consecutive times.
• Causes: • Loose connection • Defective power pack C/B output • Damaged cable • Defective development unit • Defective BCU
• Remedy: 1. Turn the main switch off and on. 2. Check if the harness and cables are properly connected. 3. Disconnect the high voltage supply cables from the bias terminals on the high voltage supply board C/B. Measure the DC voltage using a multi-meter. • Replace the high voltage supply board if no voltage is supplied. 4. If the result is OK at step 2, check if the high voltage supply cable or development unit is grounded. • Replace the high voltage supply cable if it damages. • Replace the development unit if it damages. 5. Check the PWM signals are sent to the high voltage supplied board from the BCU. Replace the BCU or harness between the BCU and high voltage supply board if the voltage is 0.