• Code: 1551
• Description: Paper thickness determining error
  During detection of paper thickness, the thickness cannot be determined because chattering occurs.
• Remedy: Replace the Main Board Assy.

• Code: 1561
• Description: Paper thickness at power-on error
  At power-on, the paper thickness sensor detects more than 2.2 mm paper thickness.
• Remedy: Execute the Paper Thickness Sensor Position Adjustment. Replace the Paper Thickness Sensor.

• Code: 1800
• Description: AID voltage error
  Due to the leak of AID current, the specified voltage cannot be achieved.
• Remedy: Check the flushing box and around it, and remove ink and dust if attached on it. (Electric current may leak through the accumulated ink or dust.) Replace the AID Board. Replace the Ink System Unit.

• Code: 1A23
• Description: Incorrect RTC data error
  The value information on various absolute time stored on NVRAM is abnormal.
• Remedy: Check if the RTC backup battery is installed properly. Replace the Main Board Assy.

• Code: 1A26
• Description: RTC Access T/O error
  The RTC circuit on the Main Board Assy malfunctions.
• Remedy: 1. Turn the power off and remove the RTC backup battery. 2. After several seconds, re-attach the battery and turn the power back on. 3. If the printer recovers from the error, set the date and time using the Service Program.

• Code: 1A37
• Description: Thermistor error
  The Head FFC is not connected correctly. The thermistor detects a temperature out of the specification. The thermistor is broken.
• Remedy: Replace the Printhead.

• Code: 1A38
• Description: Transistor environmental temperature error
  The transistor has a defect. The thermistor detects a temperature out of the specification.
• Remedy: Replace the Printhead.

• Code: 1A39
• Description: Head error
  The drive circuit in the Printhead is damaged due to a slant connection of the Head FFC, etc., or the fuse of the Main Board Assy may has blown because of such a wrong connection.
• Remedy: 1. Check the connection of the Head FFC to the Sub Board Assy, and correct it if there is a slant connection or the cable is disconnected. If any connection terminal of the Head FFC is damaged, replace it with a new one. 2. Replace the Printhead. 3. If the printer does not recover from the error after trying 1 and 2., replace the Main Board Assy. (The fuse of the Main Board Assy may have blown due to a slant connection of the Head FFC.)