• Code: 169
• Display: Service Call 169:Error
• Description: 01: thermistor is detected as shorted 02: thermistor is detected as open 03: thermistor indicates high temperature error 04: thermistor indicates low temperature error
• Remedy: Is the error message displayed? Yes Restore the power. Does this error recur? Yes After leaving the printer for 30 minutes, turn on the power again

• Code: 170, 171
• Display: Service Call 170:Error 171:Error
• Description: Short circuit (170) or open circuit (171) of the fuser thermistor was detected.
• Remedy: Does this error recur? Yes Restore the power. Replace the fuser unit.

• Code: 172, 173
• Display: Service Call 172:Error 173:Error
• Description: An abnormal (172: high or 173: low) temperature of the fuser thermistor was detected.
• Remedy: Does this error recur? Yes Restore the power. Replace the fuser unit. When the power is restored, the display may change to Service Call 994: Error in some cases.

• Code: 181 ... 185
• Display: Service Call 181:Error 182:Error 183:Error 184:Error 185:Error
• Description: Option unit I/F error (181 = Duplex Unit, 182, 183, 184, 185 = Optional Tray)
• Remedy: Does this error recur? Yes Restore the power. Check to make sure the contact points of the connector and replace the optional unit.

• Code: 188
• Display: Service Call 188:Error
• Description: 01: Error in communication with Port CPU.
  02: Error in communication with Driver CPU
• Remedy: 01: Error in communication with Port CPU Power OFF/ON. Does this error recur? Yes Replace the printer control PCB.
  02: Error in communication with Driver CPU Does this error recur? Yes Replace the Driver PCB.

• Code: 190
• Display: Power Off/On 190:Error
• Description: System memory overflow
• Remedy: Power OFF/ON. Does this error recur? Yes Replace the printer control PCB.

• Code: 203, 204
• Display: Power Off/On 203:Error 204:Error
• Description: CU program error (not occur in normal operation)
• Remedy: Power OFF/ON. Does this error recur? Yes Replace the printer control PCB.

• Code: 207, 208
• Display: Power Off/On 207:Error 208:Error
• Description: CU program error (not occur in normal operation)
• Remedy: Power OFF/ON. Does this error recur? Yes Replace the printer control PCB.