• Code: 6950
• Description: Fuser IH PWB communication error
  No response is received in 30 ms since a command is sent to IHCPU. A checksum error is detected 10 times in succession.
• Remedy: Power source PWB: 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Power source PWB (YC9) and Feed PWB 1(YC4) Power source PWB (YC3) and Fuser IH PWB (YC1) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. If the +24V output is not given by the power source PWB (YC9), replace the power source PWB.
  Feed PWB: 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Power source PWB (YC3) and Fuser IH PWB (YC1) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. If the +24V output is not given by the feed PWB1 (YC27), replace the feed PWB1.
  Fuser IH PWB: 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser IH PWB(YC4) and Engine PWB (YC26) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Fuser IH PWB.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 6960
• Description: Current PWB error
  The power current is greater than 1A for 5 seconds continuously despite that 500W was indicated as the fuser power during power-up. (45 ppm/ 55 ppm model only)
• Remedy: Current PWB: 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Current PWB(YC17) and Feed PWB2 (YC13) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Current PWB.

• Code: 6990
• Description: Fuser power supply incompatibility
  Information won’t match between the engine backup and the fuser IH PWB.
• Remedy: Differences in settings after initialization: When this has happened after initialization using U021, make settings identical with the voltages on the IH PWB using U169.
  Fuser IH PWB: Replace with a fuser IH PWB specifically designed with the standard voltage.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 7001
• Description: Toner motor K error
  A state that the pulse is not detected at the pulse sensor for 200 ms has occurred more than 15 times in a row during the toner motor K is driven. A state that the TMOT_LOCK signal becomes H (locked) is detected after 200 ms when the toner motor K is driven has occurred 15 sets in total.
• Remedy: Toner container K: 1. Check that the spiral screw of the toner container can be rotated by the hand. 2. Check for broken gears and replace if any.
  Toner motor K: 1. Draw out the toner container and execute U135 to check the toner motor operation . 2. Check the drive gear can rotate or they are not unusually loaded and, if necessary, replace. 3. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Toner motor K and Engine PWB (YC27) 4. If the wiring is disconnected, shorted or grounded, replace the wiring. 5. Replace the Toner motor K.
  Screw sensor K: 1. Check that the sensor is correctly positioned. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Screw sensor K and Engine PWB (YC27) 3. Replace the screw sensor K.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 7002
• Description: Toner motor C error
  A state that the pulse is not detected at the pulse sensor for 200 ms has occurred more than 15 times in a row during the toner motor C is driven. A state that the TMOT_LOCK signal becomes H (locked) is detected after 200 ms when the toner motor C is driven has occurred 15 sets in total.
• Remedy: Toner container C: 1. Check that the spiral screw of the toner container can be rotated by the hand. 2. Check for broken gears and replace if any.
  Toner motor C: 1. Draw out the toner container and execute U135 to check the toner motor operation . 2. Check the drive gear can rotate or they are not unusually loaded and, if necessary, replace. 3. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Toner motor C and Engine PWB (YC27) 4. If the wiring is disconnected, shorted or grounded, replace the wiring. 5. Replace the Toner motor C.
  Screw sensor C: 1. Check that the sensor is correctly positioned. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Screw sensor C and Engine PWB (YC27) 3. Replace the screw sensor C.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB

• Code: 7003
• Description: Toner motor M error
  A state that the pulse is not detected at the pulse sensor for 200 ms has occurred more than 15 times in a row during the toner motor M is driven. A state that the TMOT_LOCK signal becomes H (locked) is detected after 200 ms when the toner motor M is driven has occurred 15 sets in total.
• Remedy: Toner container M: 1. Check that the spiral screw of the toner container can be rotated by the hand. 2. Check for broken gears and replace if any.
  Toner motor M: 1. Draw out the toner container and execute U135 to check the toner motor operation . 2. Check the drive gear can rotate or they are not unusually loaded and, if necessary, replace. 3. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Toner motor M and Engine PWB (YC27) 4. If the wiring is disconnected, shorted or grounded, replace the wiring. 5. Replace the Toner motor M.
  Screw sensor M: 1. Check that the sensor is correctly positioned. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Screw sensorM and Engine PWB (YC27) 3. Replace the screw sensor M.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 7004
• Description: Toner motor Y error
  A state that the pulse is not detected at the pulse sensor for 200 ms has occurred more than 15 times in a row during the toner motor Y is driven. A state that the TMOT_LOCK signal becomes H (locked) is detected after 200 ms when the toner motor Y is driven has occurred 15 sets in total.
• Remedy: Toner container Y: 1. Check that the spiral screw of the toner container can be rotated by the hand. 1. Check for broken gears and replace if any.
  Toner motor Y: 1. Draw out the toner container and execute U135 to check the toner motor operation . 2. Check the drive gear can rotate or they are not unusually loaded and, if necessary, replace. 3. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Toner motor Y and Engine PWB (YC27) 4. If the wiring is disconnected, shorted or grounded, replace the wiring. 5. Replace the Toner motor Y.
  Screw sensor Y: 1. Check that the sensor is correctly positioned. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Screw sensor Y and Engine PWB (YC27) 3. Replace the screw sensor Y.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 7101
• Description: Toner sensor K error
  Sensor output value of 60 or less or 944 or more continued for 3 s.
• Remedy: Failure of locking the developer waste slot at setup:
  If an abnormal noise is heard, check that the developer ejection outlet is released and, if not, release the outlet.
  Toner sensor K: 1. Check the toner sensor output by U155. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Toner sensor K and Front PWB (YC9) Front PWB (YC2) and Engine PWB (YC10) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Check that the gears of the developer unit K are not damaged and the spiral can rotate. 5. Replace the Developer unit K.
  Toner motor K: 1. Draw out the toner container and execute U135 to check the toner motor operation. 2. Check the drive gear can rotate or they are not unusually loaded and, if necessary, replace. 3. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Toner motor K and Engine PWB (YC27) 4. If the wiring is disconnected, shorted or grounded, replace the wiring. 5. Replace the Toner motor K.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.