Description: EEPROM communication error An unexpected value exists in the initialization flag of the EEPROMe PSUt unit.
Causes: • EEPROM not connected • Defective EEPROM 1. Installing the EEPROM. 2. Replacing the EEPROM.
Code: 688
Description: CTL_PRREQ_N signal does not come. The ECB does not receive a memory address command from the controller 20 seconds after paper is in the position for registration.
Causes: • Defective controller board • Communication error 1. Turn the machine's main power off, and then on. 2. Check if the controller board is firmly connected to the ECB.