• Code: SC322
• Description: Laser synchronizing signal error - Timing & Condition - While the polygon motor keeps running and LD is ON, the LD control board does not receive the laser synchronizing signal.
• Causes: • Poor connection • Defective laser synchronizing detector board • Improper laser beam axis • Defective LD control board • Defective main control board • Defective optic housing unit
• Remedy: 1. Make sure the connectors (CN3 & CN 602) are properly connected on the laser synchronizing detector board and LD control board 2. Remove and clean the synchronizing detector board. 3. Check if anything (such as the Barrel Toroidal lens label in the optic housing unit) interferes with the laser axis. 4. Replace the synchronizing detector board. 5. Make sure the harness connectors (CN1 & CN603) on the LD unit and LD control board are properly connected or check a current through the harness. 6. Make sure the connectors (CN604 & CN306) on the LD control board and main control board are properly connected or check the current through the harness. 7. Replace the LD 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 - LD control boards detects the over-current, or there is no feedback signal from LD unit.
• Causes: • Poor connection • Defective LD unit • Defective LD control board • Defective main control board
• Remedy: 1. Make sure the connectors (CN1 & CN603) on the LD unit and LD control board are properly connected. 2. Check the continuity of the harness. 3. Make sure the harness connectors (CN604 & CN306)on the LD control board and main control board are properly connected. 4. Replace the LD unit. 5. Replace the LD control board 6. Replace the main control board.

• Code: SC326
• Description: FGATE1 error - Timing & Condition - The main control board does not receive the FGATE signal from the LD control board. This can occur after the Start key is pressed (the image transfer belt makes 3 revolutions) or at certain timing points during the copy cycle. - FAGTE signal - This signal is generated at the LD control board after the board receives the belt mark signal from the main control board. This signal is used to synchronize laser writes for the different colors.
• Causes: • Belt mark detection error • Electrical noise • Poor connection of connectors • Defective LD control board • Defective Main control board
• Remedy: 1. Clean the belt mark (located back side of the image transfer belt) or replace the belt if the belt mark is dirty or has peeled off. 2. Clean the belt mark detection sensor. 3. Clean the development units’ bias terminals. 4. Make sure the harness connectors (CN605 & NC406) on the LD control board and main scanner IPU board are properly connected. 5. Make sure the harness connectors (CN604 & CN306) on the LD control board and main control board are properly connected. 6. Replace the LD control board. 7. Replace the main control board. [Signal Check] • FGATE: CN604-A2 or TP22 on LD control board / CN306-A9 on main control board • Belt mark: CN220-A12, TP106, or CN212- B11 on I/O control board / CN303-B1, TP108, or CN306-B2 on main control board /CN604-B9 or TP31 on LD control board If the machine is equipped with the controller, 1. Make sure the connectors (CN606 & CN101) on the LD control board and controller I/F board are properly installed. 2. Make sure the controller I/F board is properly connected. 3. Replace the interface board.

• Code: SC327
• Description: FGATE2 error - Timing & Condition - In the double image mode, the main control board does not receive the FGATE signal from the LD control board. This can occur after the Start key is pressed (the image transfer belt makes 3 revolutions) or at certain timing points during the copy cycle.
• Causes: • Belt mark detection error • Electrical noise • Poor connection of connectors • Defective LD control board • Defective Main control board
• Remedy: 1. Clean the belt mark (located back side of the image transfer belt) or replace the belt if the belt mark is dirty or has peeled off. 2. Clean the belt mark detection sensor. 3. Clean the development units’ bias terminals. 4. Make sure the harness connectors (CN605 & NC406) on the LD control board and main scanner IPU board are properly connected. 5. Make sure the harness connectors (CN604 & CN306) on the LD control board and main control board are properly connected. 6. Replace the LD control board. 7. Replace the main control board. [Signal Check] • FGATE: CN604-A2 or TP22 on LD control board / CN306-A9 on main control board • Belt mark: CN220-A12, TP106, or CN212- B11 on I/O control board / CN303-B1, TP108, or CN306-B2 on main control board /CN604-B9 or TP31 on LD control board If the machine is equipped with the controller, 1. Make sure the connectors (CN606 & CN101) on the LD control board and controller I/F board are properly installed. 2. Make sure the controller I/F board is properly connected. 3. Replace the interface board.

• Code: SC350
• Description: TD sensor communication error - Timing - When the main switch is turned on, during printing process, or process control self-check - Condition - The main control board cannot communicate with the TD sensors
• Causes: • Poor connection • Defective TD sensor interface boards 1 and/or 2 • Defective I/O control board • Defective main control board
• Remedy: 1. Check if the connectors on the TD sensor interface board 1 (copier) and the main control board (CN353) are properly connected. 2. Make sure 5V and 12V are provided to the TD sensor interface board 1 from the main control board (CN353). 3. Check if the harnesses are damaged. 4. Make sure TD sensor interface boards 1 and 2 are properly installed. 5. Replace TD sensor interface board s1, 2, main control board, and/or the I/O control board.

• Code: SC351
• Description: TD Sensor Failure - Timing - During the printing process or the process control selfcheck - Condition - The main control board does not receive the TD sensor output or receive wrong data 4 times continuously.
• Causes: • Poor connection • Defective TD sensor • Defective TD sensor interface board 2 • Defective main control board
• Remedy: 1. Make sure the connectors on the TD sensor interface board 2 (revolver) and the TD sensor and slip ring are properly connected. 2. Check if the harnesses is damaged. 3. Replace the TD sensor. 4. Replace the TD sensor interface board 2. 5. Replace the TD sensor interface board 1. 6. Replace the main control board.

• Code: SC360
• Description: Development bias error - Timing - When the development DC bias turns ON during printing process or process control - Condition - The feedback voltage is 4.8V or higher, or PWM value becomes 80% or higher for 500 ms continuously.
• Causes: • Poor connections • Dirty terminals • Defective high voltage supply (C/G/B) • Defective I/O control board • Defective main control board
• Remedy: 1. Clean the development roller shaft (terminal). 2. Clean the bias terminal. 3. Replace the bias terminal if it does not move smoothly. 4. Make sure the connectors of high voltage supply cable and trigger lines are properly connected on the high voltage supply board (C/G/B), I/O control board, and main control board. 5. Replace the high voltage supply board (C/G/B) 6. Replace the I/O control board. 7. Replace the main control board. [Signal Check] • Feedback signal: CN217-2, TP171, or CN211-A5 on the I/O control board / CN302-A5 or TP111 on the main control board • PWM: CN217-3 or TP141 on the I/O control board

• Code: SC361
• Description: Revolver HP sensor error - Timing & Condition - The home position is not detected during 3 revolution 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. Make sure the sensors are properly connected. 2. Replace the revolver H.P. sensor if the voltage at CN216-B5 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 in this step. 3. If the revolver unit does not rotate; 1) Replace the revolver motor. 2) Replace revolver motor drive board. 3) Replace the I/O control board. 4) Replace the main control board. [Signal Check] • Revolver H.P.: CN216-B5 or TP107 on the I/O control board