Causes: EEPROM trouble EEPROM is not initialized. ICU PWB EEPROM access circuit trouble
Remedy: Check that EEPROM is properly inserted. Save the counter/adjustment values with the simulation. Use SIM16 to cancel U2 trouble. Replace the ICU PWB.
Code: U2-11
Description: Counter check sum error (ICU) Counter data area check sum error
Causes: EEPROM trouble Control circuit trouble by noise ICU PWB EEPROM access circuit trouble
Remedy: Check that EEPROM is properly inserted. Save the counter/adjustment values with the DIAG simulation. Use DIAG (SIM16) to cancel U2 trouble. Replace the ICU PWB.
Code: U2-12
Description: Adjustment value check sum error (ICU) Adjustment data area check sum error
Causes: EEPROM trouble Control circuit trouble by noise ICU PWB EEPROM access circuit trouble
Remedy: Check that EEPROM is properly inserted. Save the counter/adjustment values with the simulation. Use SIM16 to cancel U2 trouble. Replace the ICU PWB.
Code: U2-22
Description: SRAM memory check sum error (ICU) MFPC section SRAM memory check sum error
Causes: SRAM trouble Control circuit runaway due to noises ICU PWB SRAM access circuit trouble
Remedy: Initialize the communication management table registered in the SRAM and the FAX soft switch. Since the registered data are deleted, register the data again. Use SIM16 to cancel U2 trouble. Replace the ICU PWB.
Code: U2-23
Description: SRAM memory individual data check sum error (ICU) Check sum error for every data in the SRAM memory of the MFPC section (Communication management table, sender registration data, etc.)
Causes: SRAM trouble Control circuit runaway due to noises ICU PWB SRAM access circuit trouble
Remedy: Automatically initialize the data related to the check sum error by turning OFF/ ON the power. Since the registered data are deleted, register the data again. Use SIM16 to cancel U2 trouble. Replace the ICU PWB.
Code: U2-50
Description: HD section individual data check sum error (ICU) Check sum error for every individual data in HD of the MFPC section (Onetouch, Group, Program, etc.)
Causes: HDD write/read error Control circuit runaway due to noises ICU PWB HD access circuit trouble
Remedy: Automatically initialize the data related to the check sum error by turning OFF/ ON the power. Since the registered data are deleted, register the data again. Use SIM 16 to cancel the U2 trouble. Replace the HD PWB. Replace the ICU PWB.