Read Sharp MX-M850 (serv.man38) Service Manual online
MX-M1100 SELF DIAG AND TROUBLE CODE 8 – 28
L8-20
Power controller communication
trouble
trouble
U1-01
Battery abnormality
U2-00
EEPROM read / write error (ICU)
U2-05
HDD / SRAM Flash / EEPROM
discrepancy
discrepancy
U2-10
SRAM user authentication index
check sum error
check sum error
U2-11
Counter check sum error (ICU)
U2-22
SRAM memory check sum error (MFP)
U2-23
SRAM memory individual data check
sum error (MFP)
sum error (MFP)
U2-24
SRAM memory user authentication
counter check sum error
counter check sum error
U2-25
Flash memory user authentication
counter check sum error
counter check sum error
Detail
Communication establishment error / framing / parity/
protocol error
protocol error
Section
ICU
Cause
Connection trouble of the connector between the
mother board and the MFPC PWB.
MFPC PWB mother board connector pin breakage.
mother board and the MFPC PWB.
MFPC PWB mother board connector pin breakage.
Check &
Remedy
Remedy
Check connection of the connector between the mother
board and the MFPC PWB.
Check grounding of the machine.
board and the MFPC PWB.
Check grounding of the machine.
Detail
Backup SRAM battery voltage fall
Section
ICU
Cause
Battery life.
Battery circuit abnormality.
Battery circuit abnormality.
Check &
Remedy
Remedy
Check that the battery voltage is about 2.5V or above.
Detail
Read / write from / to the EEPROM device is failed
Section
ICU
Cause
EEPROM device trouble.
EEPROM device connection trouble.
Device access error due to noises
EEPROM device connection trouble.
Device access error due to noises
Check &
Remedy
Remedy
Replace the EEPROM device.
Check installation of the EEPROM device.
Replace the ICU PWB.
Check installation of the EEPROM device.
Replace the ICU PWB.
Detail
The HDD or the SRAM which differs from what was
installed before turning off the power is installed
installed before turning off the power is installed
Section
ICU
Cause
HDD replacement or SRAM replacement
Check &
Remedy
Remedy
Initialize the authentication information with Sim. 16.
Import the backup (export data by device cloning) if any.
Import the backup (export data by device cloning) if any.
Detail
User index information (user authentication basic data)
check sum error on the SRAM
check sum error on the SRAM
Section
ICU
Cause
SRAM trouble.
Control circuit malfunction.
ISU PWB SRAM access circuit trouble.
Control circuit malfunction.
ISU PWB SRAM access circuit trouble.
Check &
Remedy
Remedy
Use Sim. 16 to develop the user index information save
data from the HDD to the SRAM.
data from the HDD to the SRAM.
Detail
A check sum error of the counter information on the
EEPROM occurs
EEPROM occurs
Section
ICU
Cause
EEPROM device trouble.
EEPROM device contact trouble.
Device access error due to noises.
EEPROM device contact trouble.
Device access error due to noises.
Check &
Remedy
Remedy
Cancel the U2 trouble.
Detail
MFP PWB SRAM memory check sum error
Section
ICU / FAX
Cause
SRAM trouble.
Control circuit malfunction due to noises.
MFP PWB SRAM access circuit trouble.
Control circuit malfunction due to noises.
MFP PWB SRAM access circuit trouble.
Check &
Remedy
Remedy
Initialize the communication management table
registered in the SRAM and the FAX soft switch setting.
Since the registered contents are deleted, register the
deleted contents again.
Use Sim. 16 to cancel the U2 trouble.
Replace the MFP PWB.
registered in the SRAM and the FAX soft switch setting.
Since the registered contents are deleted, register the
deleted contents again.
Use Sim. 16 to cancel the U2 trouble.
Replace the MFP PWB.
Detail
MFP PWB SRAM memory individual data check sum
error (communication management table, sender
registration data, etc.)
error (communication management table, sender
registration data, etc.)
Section
ICU
Cause
SRAM trouble.
Control circuit malfunction due to noises.
MFP PWB SRAM access circuit trouble.
Control circuit malfunction due to noises.
MFP PWB SRAM access circuit trouble.
Check &
Remedy
Remedy
Turn OFF / ON the power to initialize the data related to
the content of check sum error.
Since the registered content is deleted, register the
deleted content again.
All the SRAM contents are set to 0 (default) in
production.
In this case, it is not treated as the U2-22 trouble, but
the SRAM contents are initialized by the software.
(The default values of the software are set.)
Use Sim. 16 to cancel the U2 trouble.
Replace the MFP PWB.
the content of check sum error.
Since the registered content is deleted, register the
deleted content again.
All the SRAM contents are set to 0 (default) in
production.
In this case, it is not treated as the U2-22 trouble, but
the SRAM contents are initialized by the software.
(The default values of the software are set.)
Use Sim. 16 to cancel the U2 trouble.
Replace the MFP PWB.
Detail
SRAM user counter check sum error
Section
ICU
Cause
SRAM trouble.
Control circuit malfunction due to noises.
ICU PWB SRAM access circuit trouble.
Control circuit malfunction due to noises.
ICU PWB SRAM access circuit trouble.
Check &
Remedy
Remedy
Recheck the check sum of the user counter with Sim.16
and save the normal sum value.
and save the normal sum value.
Detail
Flash use counter check sum error
Section
ICU
Cause
Flash trouble.
Control circuit malfunction due to noises.
ICU PWB Flash access circuit malfunction.
Control circuit malfunction due to noises.
ICU PWB Flash access circuit malfunction.
Check &
Remedy
Remedy
Recalculate the user counter check sum with Sim.16,
and save the normal sum value.
and save the normal sum value.
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