• Code: 0800
• Description: Image formation problems The printing sequence JAM (J010X) is detected for 2 consecutive times.
• Remedy: Main/Engine PWB 1. Check if the problem is a printing operation error detection in a particular file, and if it is possible to obtain the reproduction of the phenomena by the identification of the job that detected the error, and take the job log. 2. If the problem occurs in an unspecified job, check the connectors on the main/engine PWB, and reattach it. 3. Replace the main/engine PWB.

• Code: 0840
• Description: Faults of RTC [Check at powerup] The RTC setting has reverted to a previous state. Or, the machine has not been turned on for 5 years (regularly compared with a set value stored in the EEPROM). The RTC setting is older than 00:01 on January 1, 2000. [Checked periodically (at every 5 minutes) after powerup.] The RTC setting has reverted to a state older than the last time it was checked. 10 minutes have been passed since the previous check.
• Remedy: Settings of RTC Execute Date Setting using the system menu.
  Backup battery (Main/Engine PWB) 1. Check if the backup battery on the main/engine PWB is not short-circuited. 2. Unplug the power cord from the wall outlet, and wait five seconds. Then plug in the power cord and then turn on the power switch. Then plug in the power cord and then turn on the power switch. If the same service call error is displayed, replace the backup battery.
  Main/Engine PWB 1. If the communication error (due to a noise, etc.) is present with the RTC on the main/engine PWB, check that the PWB is properly grounded or secured by screws. 2. Replace the main/engine PWB.

• Code: 0970
• Description: 24V power down detect
• Remedy: Low voltage power supply PWB 1. Check that the interlock switch (ILSW) is turned on properly by the rear cover closing. 2. Check if there is a defective connection in the connector of the low voltage power supply PWB, and then check the 24V output from the main/ engine PWB (YC1-7,8). 3. Replace the low voltage power supply PWB.
  Main/Engine PWB 1. Unplug the power cord from the wall outlet, and wait five seconds. Then plug in the power cord and then turn on the power switch. 2. Check that the connectors on the main/engine PWB are properly connected, and if not, re-connect them. 3. Replace the main/engine PWB.

• Code: 1810
• Description: Paper feeder Communication error No PF connection is detected after PF connection is detected at powerup PF detection.
• Remedy: Paper feeder Check the wiring connection status with the main unit, and if necessary, reconnect it.
  PF main PWB 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. DP main PWB - Main/Engine PWB (YC47) 2. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 3. Replace the PF main PWB.
  Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the main/engine PWB.

• Code: 2200
• Description: Main motor steady-state error After the motor is stabilized, the ready signal is turned OFF for continuous 1 s.
• Remedy: Drum unit BK Check that the drum can be rotated by hand, and if it is locked, replace the drum unit BK.
  Defective connector cable or poor contact in the connector 1. Reconnect the connector if its connection is loose. 2. Check the continuity within the connector wire. If none, replace the wire. Main motor - Main/Engine PWB (YC11)
  Main motor drive transmission system 1. Check if the couplings and gears rotate smoothly, and if not, clean or grease the gears. 2. Check for broken couplings and gears, and replace if any are found.
  Main motor Replace the main motor.
  Main/Engine PWB Replace the main/engine PWB.

• Code: 2500
• Description: Paper feed motor error After the motor starting, the ready signal is not turned ON for continuous 2 s. In case the Ready signal does not turn ON 1s in succession after the motor is in the steady-state.
• Remedy: Defective connector cable or poor contact in the connector 1. Reconnect the connector if its connection is loose. 2. Check the continuity within the connector wire. If none, replace the wire. Paper feed motor - container relay PWB (YC11)
  Drive transmission system for the paper feed motor 1. Check if the rollers and gears rotate smoothly. If not, clean or grease the bushes and gears. 2. Check for broken gears and replace if any are found.
  Paper feed motor Replace the paper feed motor.
  Main/Engine PWB Replace the main/engine PWB.

• Code: 4000
• Description: Polygon motor startup error After the polygon motor starts, the motor stable signal is not turned ON after 30 s.
• Remedy: Polygon motor 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Polygon motor - Main/Engine PWB(YC20) 2. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 3. Replace the LSU.
  Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the main/engine PWB.

• Code: 4010
• Description: Polygon motor steady-state error After the polygon motor stabilization, the motor stable signal is turned OFF for consecutive 1 s or more.
• Remedy: Polygon motor 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Polygon motor - Main/Engine PWB (YC20) 2. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 3. Replace the LSU.
  Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the main/engine PWB.