• Code: SC386
• 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<=Vk>=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: SC387
• 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<=Vk>=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: SC388
• 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<=Vk>=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: SC389
• 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<=Vk>=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: SC390
• 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.

• Code: SC391
• Description: Charge AC: output error 391-01: K 391-02: Y 391-03: M 391-04: C The high voltage supply board sends the feedback signal (CN228-2 to 5; MCYK). The BCU monitors these feedback signals every 8 ms. If the average of the sampled data is not within the control target 30 consecutive times, this SC code is generated.
• Causes: • Power pack disconnected • Charge receptacle or terminal • Defective PCU bias input terminal • Incorrect power pack B/C output • Damaged cable • Defective BCU
• Remedy: 1. Turn the main switch off and on. 2. Check the connector. 3. Check the PCU charge voltage input (the spring/conducting shaft) or replace the PCU. 4. Replace the power pack B/C. 5. Replace the cable. 6. Replace the BCU.

• Code: SC460-001
• Description: Thermistor 1 error (open circuit) When the temperature detected by thermistor 1, which is at the left (fusing unit) side of the laser optics unit, is less than -30°C for 10 seconds consecutively, the BCU determines that the circuit is opened and displays this SC code.
• Causes: • Thermistor 1 defective • Cable connection error • BCU defect
• Remedy: 1. Turn the main switch off and on. 2. Check the cable connections. 3. Replace the thermistor. 4. Replace the BCU.

• Code: SC460-002
• Description: Thermistor 1 error (short circuit) When the temperature detected by the thermistor 1, which is at the left (fusing unit) side of the laser optics unit, is higher than 70°C for 10 seconds consecutively, the BCU determines that the circuit is shorted and displays this SC code
• Causes: • Thermistor 1 defective • Cable connection error • BCU defect
• Remedy: 1. Turn the main switch off and on. 2. Check the cable connections. 3. Replace the thermistor. 4. Replace the BCU.