• Code: 7914
• Description: Developer unit Y EEPROM error No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated 5 times successively. Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Remedy: Developer unit Y 1. Unplug the power cord from the wall outlet, and wait five seconds. Then plug the power cord and then turn on the power switch. 2. Confirm that the connector of the developer unit is firmly connected, and if necessary, push the unit all the way in. 3. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Developer unit and Drum relay PWB (YC9) Drum relay PWB (YC1) and Main/Engine PWB (YC15) 4. If the wire is disconnected, short-circuited or has ground fault, or the connector pin is deformed, replace the wire. 5. Replace the developer unit.
  Drum relay PWB Replace the drum relay PWB.
  Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the Main/Engine PWB.

• Code: F000
• Description: Communication error between Main/Engine PWB and Operation panel PWB
• Remedy: Main/Engine PWB 1. Unplug the power cord from the wall outlet, and wait five seconds. Then plug the power cord and then turn on the power switch. 2. Check the wirings and connectors between the Main/Engine PWB and the operation panel PWB. Operation panel PWB and Main/Engine PWB (YC2002). 3. Replace the Main/Engine PWB.
  Operation panel PWB Replace the operation panel PWB.

• Code: F010
• Description: Program read error
• Remedy: Main/Engine PWB 1. Unplug the power cord from the wall outlet, and wait five seconds. Then plug the power cord and then turn on the power switch. 2. If not corrected, replace the Main/Engine PWB and check operation.

• Code: F020
• Description: Main/Engine PWB RAM checksum error
• Remedy: Main memory of the Main/Engine PWB (RAM) 1. Unplug the power cord from the wall outlet, and wait five seconds. Then plug the power cord and then turn on the power switch. 2. If not corrected, replace the Main/Engine PWB and check operation.

• Code: F040
• Description: Communication error between Main/Engine PWB and Print engine
• Remedy: Main/Engine PWB 1. Unplug the power cord from the wall outlet, and wait five seconds. Then plug the power cord and then turn on the power switch. 2. Repair or replace the wire from the Main/ Engine PWB that may be grounded. (Check short-circuit between 5V and 3.3V.) 3. Check both main and engine firmware, and upgrade to the latest version, if necessary. 4. If not corrected, replace the Main/Engine PWB.

• Code: F050
• Description: Print engine main program error
• Remedy: Main/Engine PWB 1. Unplug the power cord from the wall outlet, and wait five seconds. Then plug the power cord and then turn on the power switch. 2. Confirm that the EEPROM has been properly installed. 3. Check both main and engine firmware, and upgrade to the latest version, if necessary. 4. If not corrected, replace the Main/Engine PWB.