Sharp MX-4100N Service Manual page 310

L8-20 Communication error of MFP/
Mother board
Trouble content
Detail MFP
Cause Mother board PWB - MFPC PWB connection trouble.
MFP PWB trouble.
Replace the mother board.
Check & Remedy Check connection between the mother board and the
MFPC PWB.
Check the ground of the main unit.
Replace the MFPC PWB.
Replace the mother board.
PC-- Personal counter not detected
Trouble content
Detail MFP
Cause The personal counter is not installed.
The personal counter is not detected.
Check & Remedy Check connection of the connectors and the
harness.
Replace the SCU PWB.
U1-01 Battery trouble
Trouble content Backup SRAM battery voltage fall.
Detail MFP
Case 1 Cause 1) Battery life
2) Battery circuit abnormality
Check & Check to confirm that the battery voltage is
Remedy about 2.0V or above.
U2-00 MFP EEPROM read/write error
Trouble content
Detail MFP
Cause MFP PWB EEPROM trouble.
EEPROM socket contact trouble.
MFP PWB trouble.
Strong external noises.
Check & Remedy Replace the MFP PWB EEPROM.
Replace the MFP PWB.
Check the power environment.
U2-05 HDD/MFP PWB SRAM contents
inconsistency
Trouble content
Detail MFP
Cause The HDD or the MFP PWB which differs from that
before turning OFF the power is installed.
HDD trouble.
MFP PWB trouble.
Check & Remedy Use SIM16 to cancel the error.
If there is backup data (export data by device
cloning), import it.
MX-5001N SELF DIAG AND TROUBLE CODE 7 – 24
U2-10 SRAM user
checksum error
Trouble content
Detail MFP
Cause SRAM user index information (user authentication
basic data) check sum error.
MFP PWB SRAM trouble.
Strong external noises.
Check & Remedy Use SIM16 to cancel the error.
Transfer the user index information data in the HDD
to the SRAM.
Replace the MFP PWB.
U2-11 MFP PWB EEPROM counter check
sum error
Trouble content
Detail MFP
Cause MFP PWB EEPROM trouble.
EEPROM socket contact trouble.
MFP PWB trouble.
Strong external noises.
Check & Remedy Use SIM16 to cancel the error.
Replace the MFP PWB.
U2-22 MFP PWB SRAM memory check sum
error
Trouble content
Detail MFP
Cause The identifier which controls the communication
management table stored in the SRAM and the
FAX soft switch is not detected correctly.
MFP PWB SRAM trouble.
MFP PWB trouble.
Strong external noises.
Check & Remedy Since the data of the communication management
table and the FAX soft switch stored in the SRAM
are initialized when an error occurs, register the
deleted data again individually.
Use SIM16 to cancel the error.
Replace the MFP PWB.
U2-23 MFP PWB SRAM memory individual
data check sum error
Trouble content MFP PWB SRAM memory individual data check sum
error.
Detail MFP
Cause The check sum value for individual data of the
communication table and the sender registration
does not match.
MFP PWB SRAM trouble.
MFP PWB trouble.
Strong external noises.
Check & Remedy Turn OFF/ON the power to initialize the data related
to the content of check sum error.
Since the registered contents are deleted, register
the deleted contents again.
Use SIM16 to cancel the error.
Replace the MFP PWB.
authentication index