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MX-7000N SELF DIAG AND TROUBLE CODE 8 – 30
U2-05
HDD/SRAM/EEPROM data
discrepancy
discrepancy
U2-10
SRAM user authentication index
check sum error
check sum error
U2-11
EEPROM check sum error
(MFP detection)
(MFP detection)
U2-22
SRAM memory check sum error
U2-23
MFPC section SRAM memory
individual data check sum error
individual data check sum error
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
U2-30
Serial number data discrepancy
(MFP
(MFP
↔ PCU)
Trouble content
A HDD or SRAM memory for user authentication
different from that used before turn off the power is
installed.
different from that used before turn off the power is
installed.
Section
MFP
Case 1
Cause
HDD replacement or SRAM memory replacement
Check and
remedy
remedy
Initialize the authentication information with SIM16,
and import the backup data (exported data by
device cloning) if any.
and import the backup data (exported data by
device cloning) if any.
Trouble content
User index information (basic data of user
authentication) check sum error on the SRAM
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
noises
3)
MFPcnt PWB SRAM access circuit trouble
Check and
remedy
remedy
Use SIM16 to cancel U2 trouble.
Trouble content
Counter information check sum error on the
EEPROM
EEPROM
Section
MFP
Case 1
Cause
1)
EEPROM device trouble
2)
EEPROM device contact failure
3)
Device access error due to electrical noises
Check and
remedy
remedy
Use SIM16 to cancel U2 trouble.
Trouble content
MFPcnt PWB SRAM memory check sum error
Section
MFP
Case 1
Cause
SRAM trouble
Check and
remedy
remedy
1)
Initialize the communication management
table registered in SRAM and the FAX soft
switch.
table registered in SRAM and the FAX soft
switch.
2)
Since the registered contents have been
deleted, register them again.
deleted, register them again.
Case 2
Cause
Control circuit hang-up due to electrical noises
Check and
remedy
remedy
Use SIM16 to cancel U2 trouble.
Case 3
Cause
MFPcnt PWB SRAM access circuit trouble
Check and
remedy
remedy
Replace the MFPcnt PWB.
Trouble content
MFPcnt PWB SRAM memory individual data
check sum error (Communication management
table, sender registration data, etc.)
check sum error (Communication management
table, sender registration data, etc.)
Section
MFP
Case 1
Cause
SRAM trouble
Check and
remedy
remedy
1)
Turn OFF/ON the power to initialize the data
related to the check sum error contents
automatically.
related to the check sum error contents
automatically.
2)
Since the registered contents have been
deleted, register them again.
deleted, register them again.
Case 2
Cause
Control circuit hang-up due to electrical noises
Check and
remedy
remedy
Use SIM16 to cancel U2 trouble.
Case 3
Cause
MFPcnt PWB SRAM access circuit trouble
Check and
remedy
remedy
Replace the MFPcnt PWB.
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
noises
3)
MFPcnt PWB SRAM access circuit trouble
Check and
remedy
remedy
Use SIM16 to cancel U2 trouble.
Trouble content
Check sum error of the user authentication counter
on FLASH
on FLASH
Section
MFP
Case 1
Cause
Flash trouble. Control circuit hang-up due to
electrical noises
MFPcnt PWB FLASH access circuit trouble.
electrical noises
MFPcnt PWB FLASH access circuit trouble.
Check and
remedy
remedy
Use SIM16 to recalculate the check sum of the
user counter and save the normal sum value.
user counter and save the normal sum value.
Trouble content
The serial number stored in the PCU differs from
that stored in the MFP.
that stored in the MFP.
Section
MFP
Case 1
Cause
EEPROM is not changed when the PCU/MFPcnt
PWB is replaced.
PWB is replaced.
Check and
remedy
remedy
1)
Check that EEPROM is properly set.
2)
Check that EEPROM on the previous PWB is
inserted to the newly installed PWB.
inserted to the newly installed PWB.
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