• Code: U1 01
• Description: FAX battery abnormality
• Causes: FAX backup SRAM battery voltage fall
• Remedy: Case 1 Cause Battery life Check & Remedy Check to insure that the battery voltage is about 2.5V or above. Case 2 Cause Battery circuit abnormality. Check & Remedy Check the battery circuit.

• Code: U1 02
• Description: RTC read trouble
• Causes: Abnormal value is read from the RTC on the ICU PWB.
• Remedy: Case 1 Cause RTC circuit abnormality Check & Remedy Set the time again with the key operation, and check that time advances properly. Check the RTC circuit. Case 2 Cause Battery voltage fall. Battery circuit abnormality. Check & Remedy Check to insure that the battery voltage is about 2.5V or above. Check the battery circuit.

• Code: U2 00
• Description: EEPROM read/write error (ICU detection)
• Causes: EEPROM version error EEPROM write error
• Remedy: Case 1 Cause EEPROM trouble. EEPROM is not initialized. Check & Remedy 1. Check that the EEPROM is properly set. 2. Use SIM 16 to cancel the error. Case 2 Cause ICU PWB EEPROM access circuit trouble Check & Remedy 1. To prevent against deletion of the counter data and the adjustment data, record them with the simulation. (When a printer option is installed, use SIM 22-1 to record the counter data and the adjustment data.) 2. Replace the ICU PWB. 3. Use SIM 16 to cancel the error.

• Code: U2 11
• Description: EEPROM check sum error (ICU detection)
• Causes: EEPROM (ICU) check sum error
• Remedy: Case 1 Cause EEPROM trouble Check & Remedy 1. Check that the EEPROM is properly set. 2. Use SIM 16 to cancel the error. Case 2 Cause Control circuit freeze by noises. ICU PWB EEPROM access circuit trouble. Check & Remedy 1. To prevent against deletion of the counter data and the adjustment data, record them with the simulation. (When a printer option is installed, use SIM 22-1 to record the counter data and the adjustment data.) 2. Replace the ICU PWB. 3. Use SIM 16 to cancel the error.

• Code: U2 22
• Description: FAX backup SRAM memory check sum error
• Causes: FAX backup SRAM memory check sum error
• Remedy: Case 1 Cause SRAM trouble Check & Remedy Initialize the one-touch dial and the FAX soft switch registered in the SRAM. Cancel the trouble with SIM 16. Case 2 Cause Control circuit freeze by noises. Access circuit trouble. Check & Remedy Replace the FAX PWB. Use SIM 16 to cancel the error.

• Code: U2 30
• Description: Production No. data discrepancy (ICU - PCU)
• Causes: The production No. recorded in the PCU differs from that recorded in the ICU.
• Remedy: Case 1 Cause EEPROM is not exchanged when replacing the PCU/ ICU PWB. Check & Remedy Check that the EEPROM is properly installed. When replacement, check that the EEPROM before replacement is inserted to the board after replacement.

• Code: U2 80
• Description: EEPROM read/write error (SCN)
• Causes: EEPROM version error EEPROM write error
• Remedy: Case 1 Cause EEPROM trouble, Insertion of EEPROM which is not initialized or defective. Check & Remedy 1. Check that the EEPROM is properly inserted. 2. Use SIM 16 to cancel the error. Case 2 Cause SCN PWB EEPROM access circuit trouble Check & Remedy 1. To prevent against deletion of the counter data and the adjustment data, record them with the simulation. (When a printer option is installed, use SIM 22-1 to record the counter data and the adjustment data.) 2. Replace the SCN PWB. 3. Use SIM 16 to cancel the error.

• Code: U2 81
• Description: Adjustment value check sum error (SCN)
• Causes: EEPROM (SCN) check sum error
• Remedy: Case 1 Cause EEPROM trouble Check & Remedy 1. Check that the EEPROM is properly inserted. 2. Use SIM 16 to cancel the error. Case 2 Cause SCN PWB EEPROM access circuit trouble Check & Remedy 1. To prevent against deletion of the counter data and the adjustment data, record them with the simulation. (When a printer option is installed, use SIM 22-1 to record the counter data and the adjustment data.) 2. Replace the SCN PWB. 3. Use SIM 16 to cancel the error.