Olivetti d-Copia 12 Service Manual page 71

Main code Sub code
U2 01
U2 04
Y101700-5
Trouble content
Counter sum check error.
EEPROM serial
communication error
Detail of trouble
When the counter check sum value stored in the EEPROM
is abnormal.
When a communication trouble occurs with the EEPROM.
Service Manual 6-17