• Code: SC320
• Description: Polygon motor error - Condition - • The PMLOCK signal is not received by the LD main control board within a predetermined period of time.
• Causes: • Poor connection of connector • Defective polygon motor • Defective LD main control board • Defective scanner IPU board
• Remedy: 1. Check that the connector (CN602-4) on the LD control board is properly connected. 2. Check the continuity of cable. 3. Replace the polygon motor. 4. Replace the LD main control board. 5. Replace the scanner IPU board.

• Code: SC322
• Description: Laser synchronizing signal error - Timing & Condition - While the polygon motor is running and the laser diode is on, the LD main control board does not receive the laser synchronizing signal.
• Causes: • Poor connection of connectors • Defective laser synchronizing detector board • Improper laser beam axis • Defective LD control board • Defective main control board • Defective optic housing unit
• Remedy: 1. Check if the connectors (CN 604) are properly connected on the laser synchronizing detector board and LD main control board 2. Remove and clean the synchronizing detector board. 3. Check if anything such as the seal of the barrel toroidal lens in the optic housing unit interferes with the laser beam axis. 4. Replace the synchronizing detector board. 5. Check if the cable connectors (CN1 & CN605) on the LD drive board and LD main control board are properly connected or check the continuity of the cable. 6. Check if the cable connectors (CN601 & CN306) on the LD main control board and main control board are properly connected or check the continuity of the cable. 7. Replace the LD main control board. 8. Replace the main control board 9. Check the optical housing unit or replace it.

• Code: SC323
• Description: LD error - Timing - During LD writing - Condition - The LD main control board detects over-current or no feedback signal from the LD drive board.
• Causes: • Poor connection of connector • Defective LD drive board • Defective LD main control board • Defective main control board
• Remedy: 1. Check if the connectors (CN1 & CN605) on the LD drive board and LD main control board are properly connected. 2. Check the continuity of the cable. 3. Check that the cable connectors (CN601 & CN306) on the LD control board and main control board are properly connected. 4. Replace the LD drive board. 5. Replace the LD main control board 6. Replace the main control board.

• Code: SC325
• Description: Magnification correction error The length of a line measured during main scan auto magnification correction does not fall within -0.1% to 0.1% of the center value. Detection timing: When three main scan magnification corrections failed successively.
• Causes: Dirty or incorrectly installed synch. detector board, or defective polygon motor
• Remedy: This SC is only logged, and not displayed, so no particular action is required (no adverse influence is exerted on copier operation). Take the following actions if the customer complains about excessive magnification errors. Dirty synchronizing detector board: Clean it Incorrect synchronizing detector board installation: Reinstall Defective polygon motor: Replace

• Code: SC326
• Description: FGATE1 error - Timing & Condition - The main control board does not receive the FGATE signal from the LD control board during 3 revolutions of the transfer belt.
• Causes: • Belt mark detection error • Electrical noise • Poor connection of connectors
• Remedy: 1. Clean the belt mark located on the back side of the transfer belt or replace the belt if the belt mark is dirty or peeled off. 2. Clean the transfer belt home position sensor if it is dirty. 3. Clean the bias terminals of the development units if they are dirty. 4. Check if the cable connectors (CN606 & NC408) on the LD main control board and scanner IPU board are properly connected. 5. Check if the cable connectors (CN601 & CN306) on the LD main control board and main control board are properly connected. 6. Replace the LD main control board. 7. Replace the main control board. - Signals to Check - • FGATE: CN601-A2 or TP608 on LD main control board / CN306-A9 on main control board • Belt mark: CN218-B11, TP210, or CN233-A6 on I/O control board / CN303-B1, TP108, or CN306-B2 on main control board / CN601-B9 or TP606 on LD main control board If the machine is equipped with the controller, 1. Check if the connectors (CN609) on the LD control board and controller I/F board are properly set. 2. Check if the controller I/F board is properly connected. 3. Replace the interface board.

• Code: SC327
• Description: FGATE2 error - Timing & Condition - When two pages are to be written on the transfer belt at the same time, the main control board does not receive the 2nd FGATE signal from the LD main control board during 3 revolutions of the transfer belt.
• Causes: • Belt mark detection error • Electrical noise • Poor connection of connectors
• Remedy: 1. Clean the belt mark located on the back side of the transfer belt or replace the belt if the belt mark is dirty or peeled off. 2. Clean the transfer belt home position sensor if it is dirty. 3. Clean the bias terminals of the development units if they are dirty. 4. Check if the cable connectors (CN606 & NC408) on the LD main control board and scanner IPU board are properly connected. 5. Check if the cable connectors (CN601 & CN306) on the LD main control board and main control board are properly connected. 6. Replace the LD main control board. 7. Replace the main control board. - Signals to Check - • FGATE: CN601-A2 or TP608 on LD main control board / CN306-A9 on main control board • Belt mark: CN218-B11, TP210, or CN233-A6 on I/O control board / CN303-B1, TP108, or CN306-B2 on main control board / CN601-B9 or TP606 on LD main control board If the machine is equipped with the controller, 1. Check if the connectors (CN609) on the LD control board and controller I/F board are properly set. 2. Check if the controller I/F board is properly connected. 3. Replace the interface board.

• Code: SC360
• Description: Development bias error - Timing - When the development DC bias is on during printing or process control - Condition - The feedback voltage is 4.8V or higher, or the PWM value becomes 80% or higher for 500 ms continuously.
• Causes: • Poor connection of connectors • Dirty terminals • Defective high voltage supply (B) • Defective I/O control board • Defective main control board
• Remedy: 1. Clean the development roller shaft (terminal). 2. Clean the bias terminal if it is dirty. 3. Poor connection: Correct the leaf spring shape. 4. Replace the bias terminal if it does not move smoothly. 5. Check the connectors of high voltage supply cable and trigger lines are properly connected on the high voltage supply board (B), I/O control board, and main control board. 6. Replace the high voltage supply board (B) 7. Replace the I/O control board. 8. Replace the main control board. - Signals to Check - • Feedback signal: CN203-A12, TP228, or CN214-A5 on I/O control board / CN302-A5 or TP167 on main control board • PWM: CN203-A13 or TP234 on I/O control board

• Code: SC361
• Description: Revolver HP sensor error - Timing & Condition - The home position is not detected during 3 revolutions of the revolver unit after the revolver motor turns on.
• Causes: • Poor connection of connector • Dirty sensor • Defective sensor • Defective revolver motor • Defective revolver drive board • Defective I/O control board • Defective main control board
• Remedy: 1. Check if the sensor connector is properly connected. 2. Replace the revolver H.P. sensor if the voltage at CN203-A4 on the I/O control board does not change when covering the sensor with a piece of paper. NOTE: Make sure that the revolver unit is locked for this step. 3. If the revolver unit does not rotate; 1 Replace the revolver motor. 2 Replace the revolver motor drive board. 3 Replace the I/O control board. 4 Replace the main control board. - Signals to Check - • Revolver H.P.: CN203-A4 or TP211 on I/O control board