• Code: SC 461-001
• Description: Thermistor 2 error (open circuit) When the temperature detected by the thermistor 2, which is at the right (paper feed section) 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 2 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: SC 461-002
• Description: Thermistor 2 error (short circuit) When the temperature detected by the thermistor 2, which is at the right (paper feed section) 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 2 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: SC 502
• Description: Paper Tray 2 error When the tray lift motor is turned on, if the upper limit is not detected within 10 seconds, the machine asks the user to reset the tray. If this condition occurs three consecutive times, the SC is generated.
• Causes: • Defective paper lift sensor • Defective tray lift motor • Defective bottom plate lift mechanism
• Remedy: 1. Turn the main switch off and on. 2. Check if the bottom plate smoothly moves up and down manually. 3. Check and/or replace the paper lift sensor. 4. Check and/or replace the tray lift motor.

• Code: SC195
• Description: Serial Number Mismatch • Serial number stored in the memory does not consist of the correct code.
• Causes: • EEPROM defective • BCU replaced without original EEPROM
• Remedy: Open the front cover and turn on the main switch. Check the serial number with SP5-811-002. If the stored serial number is incorrect, contact your product specialist for details of how to solve the problem.

• Code: SC201
• Description: Polygon motor error • The polygon mirror motor does not reach the targeted operating speed within 15 seconds after turning on. • The lock signal does not become low within 15 seconds after turning off the polygon motor.
• Causes: • Polygon mirror motor error • Abnormal GAVD behavior • Cable disconnection
• Remedy: 1. Turn the main switch off and on. 2. Check the cables. 3. Replace the polygon motor.

• Code: SC220
• Description: Synch. detection signal error 1 220-001: Y 220-002: M 220-003: C 220-004: K0 220-005: K1 The front (for K&Y) or rear (for C&M) laser synchronizing detector board, which is used to determine the start timing of laser writing, does not send a signal while the polygon motor is operating normally and the LD is on.
• Causes: • Disconnection of the cable between front (K&Y) or rear (C&M) synchronizing detector board and the LD unit • Incorrect installation of front (K&Y) or rear (C&M) synchronizing detector board (the beam does not target the photo detector.) • Defective LD unit • Defective BCU
• Remedy: 1. Turn the main switch off and on. 2. Check the cable connection between front (for K&Y) or rear (for C&M) synchronizing detector board and the LD unit. 3. Check or reinstall the front (for K&Y) or rear (for C&M) synchronizing detector board. 4. Replace the front (for K&Y) or rear (for C&M) synchronizing detector board. 5. Replace the LD unit. 6. Replace the BCU.

• Code: SC221
• Description: Synch. detection signal error 2 221-001: Y 221-002: M 221-003: C 221-004: K Main scan length detection is not properly completed ten consecutive times. The front (for C&M) or rear (for K&Y) laser synchronizing detector boards are used for the main scan length detection, which automatically corrects the main-scan magnification.
• Causes: • Damaged or disconnected cable between front (C&M) or rear (K&Y) laser synchronizing detector board and the LD unit • Incorrect installation of front (C&M) or rear (K&Y) synchronizing detector board (the beam does not target the photo detector.) • Defective front (C&M) or rear (K&Y) synchronizing detector board • Defective LD unit
• Remedy: After doing any of the following, print ten jobs or more to see if the same SC code is displayed: 1. Turn the main switch off and on. 2. Check or replace the cable connecting front (for C&M) or rear (for K&Y) synchronizing detector board and the LD unit. 3. Check or reinstall the front (for C&M) or rear (for K&Y) synchronizing detector board. 4. Replace the front (for C&M) or rear (for K&Y) synchronizing detector board. 5. Replace the LD unit. 6. Replace the BCU. If a synch. detector board cannot be replaced, do the following as a temporary measure: • Disable main scan length detection (SP 2-919-001)

• Code: SC230
• Description: FGATE error 230-001: Y 230-002: M 230-003: C 230-004: K The BCU generates the FGATE signal based on the registration sensor ON timing. Then, it sends the signal to the LD units. The LD units send a feedback signal to the BCU. When the LD units start emitting laser beams, the feedback signal changes from High to Low. The SC code is generated when the BCU receives no feedback signal (stays High) from the LD unit 1 second after paper reaches the position where the laser should start writing.
• Causes: • Poor connection between BCU and LD units • Defective BCU • Defective LD unit
• Remedy: 1. Turn the main switch off and on. 2. Check the cables between the LD units and the BCU. 3. Replace the LD unit. 4. Replace the BCU.