Code :

Code: 641
Description: Communication error: Engine Controller (No response)
No response from engine to frame after frame sending from controller with RAPI protocol. (No response after 3 attempts of sending every 100 ms)
Causes: Asserts the error detected by the serial driver from PSC module to SRM with RAPI command.
Remedy: 1. Turn the main switch off and on.

Code: 669
Description: EEPROM error
Retry of EEPROM communication fails three times after the machine has detected the EEPROM error.
Causes: Caused by noise
Remedy: 1. Turn the main power switch off and on.

Code: 670
Description: Engine start up error
The BICU fails to respond within the prescribed time when the machine is turned on.
Causes: Connections between BICU and controller board are loose, disconnected, or damaged.
Remedy: 1. Replace the BICU. 2. Replace the controller board.

Code: 672
Description: Controller start up error
After the machine is powered on, the communication between the controller and the operation panel is not established, or communication with the controller is interrupted after a normal startup. After startup reset of the operation panel, the attention code (FDH) or the attention acknowledge code (FEH) is not sent from the controller within 30 seconds. After the controller issues a command to check the communication line 687with the controller at 30-second intervals, the controller fails to respond twice.
Causes: Controller stalled. Controller board installed incorrectly. Controller board defective. Operation panel connector loose or defective. The controller is not completely shut down when the main switch is turned off.
Remedy: 1. Check the setting of SP5-875-001. If the setting is set to "1 (OFF)", change it to "0 (ON)".

Code: 681
Description: Toner bottle ID: Communication error
Communication error occurs when the toner bottle ID starts to communicate with the toner bottle ID receptor. Retry of toner bottle ID communication fails three times after the machine has detected the toner bottle ID communication error.
Causes: Defective toner bottle ID reader and writer. Disconnected ASAP I/F. No memory chip on the toner cartridge. Noise.
Remedy: 1. Replace the toner bottle detection board. 2. Replace the toner cartridge.

Code: 682
Description: HST sensor: Communication error
Retry of memory chip communication fails three times after the machine has detected the memory chip communication error.
Causes: Damaged memory chip data. Disconnected interface. No memory chip on the development unit. Noise.
Remedy: 1. Replace the PCDU. 2. Replace the BICU.

Code: 687
Description: Memory address (PER) command error
The BICU does not receive a memory address command from the controller 120 seconds after paper is in the position for registration.
Causes: Loose connection. Defective controller. Defective BICU.
Remedy: 1. Check if the controller is firmly connected to the BICU. 2. Replace the controller 3. Replace the BICU