Eeprom Check Sum Error (Mfp Detection); Sram Memory Check Sum Error; Mfpc Section Sram Memory Individual Data Check Sum Error; Flash Memory User Authentication Counter Check Sum Error - Sharp MX-2300 G Service Manual

U2-10 SRAM user
check sum error
Trouble content User index information (basic data of user
authentication) check sum error on the SRAM
Section MFP
Case 1 Cause 1) SRAM trouble
2) Hang-up of the control circuit due to electrical
noises
3) MFPcnt PWB SRAM access circuit trouble
Check Use SIM16 to cancel U2 trouble.
and
remedy
U2-11 EEPROM check sum error
(MFP detection)
Trouble content Counter information check sum error on the EEPROM
Section MFP
Case 1 Cause 1) EEPROM device trouble
2) EEPROM device contact failure
3) Device access error due to electrical noises
Check Use SIM16 to cancel U2 trouble.
and
remedy
U2-22

SRAM memory check sum error

Trouble content MFPcnt PWB SRAM memory check sum error
Section MFP
Case 1 Cause SRAM trouble
Check 1) Initialize the communication management table
and registered in SRAM and the FAX soft switch.
remedy 2) Since the registered contents have been deleted,
register them again.
Case 2 Cause Control circuit hang-up due to electrical noises
Check Use SIM16 to cancel U2 trouble.
and
remedy
Case 3 Cause MFPcnt PWB SRAM access circuit trouble
Check Replace the MFPcnt PWB.
and
remedy
U2-23 MFPC section SRAM memory
individual data check sum error
Trouble content MFPcnt PWB SRAM memory individual data check
sum error (Communication management table, sender
registration data, etc.)
Section MFP
Case 1 Cause SRAM trouble
Check 1) Turn OFF/ON the power to initialize the data
and related to the check sum error automatically.
remedy 2) Since the registered contents have been deleted,
register them again.
Case 2 Cause Control circuit hang-up due to electrical noises
Check Use SIM16 to cancel U2 trouble.
and
remedy
Case 3 Cause MFPcnt PWB SRAM access circuit trouble
Check Replace the MFPcnt PWB.
and
remedy
authentication index
MX-2300/2700 N/G SELF DIAG AND TROUBLE CODE 8 – 25
U2-24 SRAM memory user authentication
counter check sum error
Trouble content Check sum error of the user counter on SRAM
Section MFP
Case 1 Cause 1) SRAM trouble
2) Control circuit hang-up due to electrical noises
3) MFPcnt PWB SRAM access circuit trouble
Check Use SIM16 to cancel U2 trouble.
and
remedy
U2-25 Flash memory user authentication
counter check sum error
Trouble content Check sum error of the user authentication counter on
FLASH
Section MFP
Case 1 Cause Flash trouble. Control circuit hang-up due to electrical
noises
MFPcnt PWB FLASH access circuit trouble.
Check Use SIM16 to recalculate the check sum of the user
and counter and save the normal sum value.
remedy
U2-30 Serial number data discrepancy
(MFP ↔ PCU)
Trouble content The serial number stored in the PCU differs from that
stored in the MFP.
Section MFP
Case 1 Cause EEPROM is not changed when the PCU/MFPcnt
PWB is replaced.
Check 1) Check that EEPROM is properly set.
and 2) Check that EEPROM on the previous PWB is
remedy inserted to the newly installed PWB.
U2-50 HDD section individual data check
sum error
Trouble content MFPcnt HDD individual data check sum error (One-
touch, group, program, etc.)
Section MFP
Case 1 Cause Write/read error to/from HDD
Check 1) Turn OFF/ON the power to initialize the data
and related to the check sum error contents.
remedy 2) Since the registered contents have been deleted,
register them again.
3) If the trouble is not canceled, replace the HDD.
Case 2 Cause Control circuit hang-up due to electrical noises
Check Use SIM16 to cancel U2 trouble.
and
remedy
Case 3 Cause MFPcnt PWB HDD access circuit trouble
Check Replace the MFPcnt PWB.
and
remedy