• Code: SC385
• Description: ID sensor VSG adjustment error - Timing - During process control self check, the main control board detects that the Vsg signal fed back from the ID sensor is out of range.
• Causes: • Dirty ID sensor • Poor connection of connector • Defective ID sensor • Poor cleaning
• Remedy: 1. Clean the ID sensor. 2. Check if the sensor connector is properly connected. 3. Replace the ID sensor. 4. Check the drum cleaning unit. - Signals to Check - • ID sensor LED: CN203-B9 or TP252 on I/O control board • ID sensor 1 (K ): CN203-B10 or TP227 on I/O control board / TP174 on main control board. • ID sensor 2 (CMY): CN203-B11 or TP229 on I/O control board / TP173 on main control board.

• Code: SC386
• Description: Amount of toner on sensor pattern too low during ID pattern measurement The amount of toner obtained during YCM ID pattern measurement was less than (target value for the amount of toner) minus (threshold value for detecting insufficient toner density) 5 consecutive times, even though there was no toner end condition - If ID sensor error (SC385) is detected before this SC, no detection is attempted unless Vsg is adjusted and the ID sensor error condition is reset. - This SC does not apply to black toner since the toner end sensor is not used for Bk.
• Causes: Defective toner end sensor, dirt in toner cartridge end sensor window
• Remedy: This SC is only logged in the memory (not displayed), so no particular action is required (no adverse influence is exerted on copier operation). Defective toner end sensor: SP5-803-010 (Input check: toner end sensor), replace if necessary. Dirty toner end sensor window: Clean. Toner supply seal peeled off: Remove the cartridge and check the seal in the hopper.

• Code: SC387
• Description: Drum potential error - Timing - During initial process control check or interval (number of copies) process control self check - Condition - While the revolver unit returns to the home position, the following condition is detected. VD < VG – 200V VD > VG + 200V
• Causes: • Uneven charge • Worn drum • Defective potential sensor
• Remedy: 1. Clean the charge corona unit or replace the charge corona wire and grid plate. 2. Reinstall the drum. 3. Replace the drum if necessary. 4. Replace the potential sensor.

• Code: SC400
• Description: Image transfer belt bias error - Timing - When the image transfer belt bias is on during printing or a process control self check - Condition - The feedback voltage is 4.8V or higher, or the PWM value is 50% or higher (indicating a leak) for 500 ms continuously.
• Causes: • Poor connection of connectors • Defective high voltage supply board (T1,PCC) • Defective I/O control board • Defective main control board
• Remedy: 1. Check if the connectors of high voltage cables and trigger lines are properly connected on the high voltage supply board, I/O control board, and main control board. 2. Clean the bias terminals. 3. Replace the high voltage supply board (T1,PCC). 4. Replace the I/O control board. 5. Replace the main control board. - Signals to Check - • Feedback signal: CN277-B3, TP221, or CN214-A4 on I/O control board / CN302-A6 or TP158 on main control board. • PWM: CN227-B4 or TP209 on I/O control board.

• Code: SC422
• Description: PCC leak - Timing & Condition - When the current leak is detected for 2 seconds, leak detection starts 1 second after the PCC turns on. The leak signal is monitored twice at 1 second intervals. When the leak condition is detected twice continuously, this SC is displayed.
• Causes: • PCC unit not properly set • Corona wire broken • Defective high voltage supply board (T1,PCC) • Defective I/O control board • Defective main control board
• Remedy: 1. Check if the PCC unit is properly instaled. 2. Replace the corona wire if it is broken. 3. Check if the connectors on the terminal and high voltage supply board (T1,PCC) are properly connected and if the cables are damaged. 4. Clean the receptacle. 5. Replace the high voltage supply board (T1,PCC). 6. Replace the I/O control board. 7. Replace the main control board. - Signals to Check - • Leak detection: CN227-B1 or TP294 on I/O control board.

• Code: SC440
• Description: Drum motor error - Timing & Condition - • The feedback signal from the motor is still out of range 1 second after the trigger signal is sent. • The feedback signal becomes out of range for 2 seconds while the trigger signal is on.
• Causes: • Poor connection of connector • Defective drum motor • Defective I/O control board • Defective main control board
• Remedy: 1. Check if the drum is locked by the cleaning blade. If it is, replace the cleaning blade. 2. Check if the connector (CN223) on the I/O control board is properly connected. 3. Check if the drum motor works properly using SP 5- 804-001 to 004. If not, replace the drum motor. 4. Replace the I/O control board. 5. Replace the main control board. - Signals to Check - • Motor OK: CN223-B5 or TP295 on the I/O control board

• Code: SC450
• Description: Paper transfer bias current error - Timing - When the paper transfer bias is on during printing - Condition - The feedback voltage is 4.8V or higher (indicating a leak), or PWM value is 50% or higher for 500 ms continuously.
• Causes: • Defective high voltage supply (T2,D) • Defective I/O control board • Defective main control board
• Remedy: 1. Check if the connectors of high voltage cables and trigger lines are properly connected on the high voltage supply board (T2,D), I/O control board, and main control board. 2. Replace the high voltage supply board (T2,D). 3. Replace the I/O control board. 4. Replace the main control board. - Signals to Check - • Feedback signal: CN227-A3, TP220, or CN214-A3 on I/O control board / CN302-A7 or TP105 on the main control board • PWM: CN227-A4 or TP208 on I/O control board

• Code: SC452
• Description: Transfer belt mark detection error - Timing & Condition- The main control board does not receive the belt mark detection signal from the transfer belt home position sensor for a certain period.
• Causes: • Dirty or damaged belt mark • Belt mark out of position • Defective sensor • Defective I/O control board • Defective main control board
• Remedy: 1. Check if the transfer belt release lever is properly set. 2. Clean the belt mark if it is dirty. 3. Replace the transfer belt if a belt mark has peeled off or is damaged. 4. Clean the transfer belt home position sensor if it is dirty. 5. Replace the transfer belt home position sensor. 6. Replace the I/O control board. 7. Replace the main control board. - Signals to Check - • Sensor: CN223-A6, TP210, or CN218-B11 on I/O control board / CN303-B1 or TP137 on the main control board.