• Code: 6030
• Description: Broken fuser thermistor 1 wire
  The detected temperature of fuser thermistor 1 is 60 °C/140°F or more and input from fuser thermistor 2 is 3 or less (A/D value) continuously for 1 second (5.5 ms Ч 182 times).
• Causes: Defective harness between fuser thermistor 2 and paper exit PWB (YC5), or improper connector insertion. Defective harness between paper exit PWB (YC1) and engine PWB (YC602), or improper connector insertion. Broken fuser thermistor 2 wire. Fuser thermistor 2 installed incorrectly. Fuser thermal cutout triggered. Fuser heater lamp 1 installed incorrectly. Broken fuser heater lamp 1 wire. Defective engine PWB.
• Remedy: Defective harness between fuser thermistor 2 and paper exit PWB (YC5), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective harness between paper exit PWB (YC1) and engine PWB (YC602), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Broken fuser thermistor 2 wire. Replace the fuser unit.
  Fuser thermistor 2 installed incorrectly. Replace the fuser unit.
  Fuser thermal cutout triggered. Replace the fuser unit.
  Fuser heater lamp 1 installed incorrectly. Replace the fuser unit.
  Broken fuser heater lamp 1 wire. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB.

• Code: 6100
• Description: Broken fuser heater lamp 2 wire
  The detected fuser thermistor 2 temperature does not rise 1°C/1.8°F after the fuser heater lamp 2 has been turned on continuously for 5 seconds in warming up. The detected temperature of fuser thermistor 1 does not reach 80°C/176°F after fuser heater lamp 2 has been turned on continuously for 40 seconds in warming up. The detected temperature of fuser thermistor 1 does not rise 1°C/1.8°F after fuser heater lamp 2 has been turned on continuously for 5 seconds during printing. The detected temperature of fuser thermistor 1 is 100°C/180°F lower than the detected temperature of fuser thermistor 2 continuously for 3 seconds.
• Causes: Defective harness between fuser thermistor 1 and paper exit PWB (YC4), or improper connector insertion. Defective harness between paper exit PWB (YC1) and engine PWB (YC602), or improper connector insertion. Fuser thermistor 1 installed incorrectly. Fuser thermal cutout triggered. Fuser heater lamp 2 installed incorrectly. Broken fuser heater lamp 2 wire. Defective engine PWB.
• Remedy: Defective harness between fuser thermistor 1 and paper exit PWB (YC4), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective harness between paper exit PWB (YC1) and engine PWB (YC602), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Fuser thermistor 1 installed incorrectly. Replace the fuser unit.
  Fuser thermal cutout triggered. Replace the fuser unit.
  Fuser heater lamp 2 installed incorrectly. Replace the fuser unit.
  Broken fuser heater lamp 2 wire. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB.

• Code: 6120
• Description: Abnormally high temperature fuser heater lamp 2
  The fuser thermistor 1 detects a temperature higher than 240°C/464°F. By the activation of the high temperature error detection circuit (230°C/446°F or more) of fuser thermistor 2, the illumination of fuser heater lamp 2 was forcibly turned off and 10 seconds has elapsed.
• Causes: Shorted fuser thermistor 1. Defective engine PWB.
• Remedy: Shorted fuser thermistor 1. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB.

• Code: 6130
• Description: Broken fuser thermistor 2 wire
  Input from fuser thermistor 1 is 3 or less (A/D value) continuously for 1 second (5.5 ms x 182 times).
• Causes: Defective harness between fuser thermistor 1 and paper exit PWB (YC5), or improper connector insertion. Defective harness between paper exit PWB (YC1) and engine PWB (YC602), or improper connector insertion. Broken fuser thermistor 1 wire. Fuser thermistor 1 installed incorrectly. Defective engine PWB.
• Remedy: Defective harness between fuser thermistor 1 and paper exit PWB (YC5), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective harness between paper exit PWB (YC1) and engine PWB (YC602), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Broken fuser thermistor 1 wire. Replace the fuser unit.
  Fuser thermistor 1 installed incorrectly. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB.

• Code: 6400
• Description: Zero cross signal error
  The zero cross signal (ZCROSS) does not reach the engine PWB for specified time.
• Causes: Defective harness between power source PWB (YC103) and engine PWB (YC19), or improper connector insertion. Defective power source PWB. Defective engine PWB.
• Remedy: Defective harness between power source PWB (YC103) and engine PWB (YC19), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective power source PWB. Replace the power source PWB.
  Defective engine PWB. Replace the engine PWB.

• Code: 7001
• Description: Toner motor K error
  When the toner motor K is driven, the toner motor K over-current detection signal is detected continuously for 50 times (5 s) at 100 ms intervals.
• Causes: Defective harness between toner motor K and engine PWB (YC22), or improper connector insertion. Defective drive transmission system of the toner motor K. Defective toner motor K. Defective engine PWB.
• Remedy: Defective harness between toner motor K and engine PWB (YC22), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective drive transmission system of the toner motor K. Check if the gears rotate smoothly. If not, grease the bushings and gears. Check for broken gears and replace if any.
  Defective toner motor K. Replace the toner motor K.
  Defective engine PWB. Replace the engine PWB.

• Code: 7002
• Description: Toner motor C error
  When the toner motor C is driven, the toner motor C over-current detection signal is detected continuously for 50 times (5 s) at 100 ms intervals.
• Causes: Defective harness between toner motor C and engine PWB (YC24), or improper connector insertion. Defective drive transmission system of the toner motor C. Defective toner motor C. Defective engine PWB.
• Remedy: Defective harness between toner motor C and engine PWB (YC24), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective drive transmission system of the toner motor C. Check if the gears rotate smoothly. If not, grease the bushings and gears. Check for broken gears and replace if any.
  Defective toner motor C. Replace the toner motor C.
  Defective engine PWB. Replace the engine PWB.

• Code: 7003
• Description: Toner motor M error
  When the toner motor M is driven, the toner motor M over-current detection signal is detected continuously for 50 times (5 s) at 100 ms intervals.
• Causes: Defective harness between toner motor M and engine PWB (YC25), or improper connector insertion. Defective drive transmission system of the toner motor M. Defective toner motor M. Defective engine PWB.
• Remedy: Defective harness between toner motor M and engine PWB (YC25), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective drive transmission system of the toner motor M. Check if the gears rotate smoothly. If not, grease the bushings and gears. Check for broken gears and replace if any.
  Defective toner motor M. Replace the toner motor M.
  Defective engine PWB. Replace the engine PWB.