Read Sharp MX-1800N (serv.man16) Service Manual online
MX-1800N SELF DIAG AND TROUBLE CODE 8 – 23
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)
U2-50
HDD section individual data check
sum error
sum error
U2-80
EEPROM read/write error
(SCU detection)
(SCU detection)
U2-81
Adjustment value check sum error
(SCU detection)
(SCU detection)
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 automatically.
related to the check sum error 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.
Trouble content
MFPcnt HDD individual data check sum error
(One-touch, group, program, etc.)
(One-touch, group, program, etc.)
Section
MFP
Case 1
Cause
Write/read error to/from HDD
Check and
remedy
remedy
1)
Turn OFF/ON the power to initialize the data
related to the check sum error contents.
related to the check sum error contents.
2)
Since the registered contents have been
deleted, register them again.
deleted, register them again.
3)
If the trouble is not canceled, replace the
HDD.
HDD.
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 HDD access circuit trouble
Check and
remedy
remedy
Replace the MFPcnt PWB.
Trouble content
1) EEPROM version error
2) Write error to EEPROM
2) Write error to EEPROM
Section
Scanner
Case 1
Cause
EEPROM trouble, installation of EEPROM which is
not initialized
not initialized
Check and
remedy
remedy
Check that EEPROM is properly set.
Case 2
Cause
SCU PWB EEPROM access circuit trouble
Check and
remedy
remedy
To avoid deletion of the counter data/adjustment
data, use the simulation to save the counter/
adjustment values. (If there is a printer option,
execute SIM22-1 to save the counter data and the
adjustment values.) Replace the SCU PWB. Use
SIM16 to cancel the trouble.
data, use the simulation to save the counter/
adjustment values. (If there is a printer option,
execute SIM22-1 to save the counter data and the
adjustment values.) Replace the SCU PWB. Use
SIM16 to cancel the trouble.
Trouble content
EEPROM (SCU) check sum error
Section
Scanner
Case 1
Cause
Control circuit hang-up due to electrical noises
Check and
remedy
remedy
Use SIM16 to cancel U2 trouble.
Case 2
Cause
EEPROM trouble
Check and
remedy
remedy
To avoid deletion of the counter data/adjustment
data, use the simulation to save the counter/
adjustment values. (If there is a printer option,
execute SIM22-1 to save the counter data and the
adjustment values.) Replace the SCU PWB. Use
SIM16 to cancel the trouble.
data, use the simulation to save the counter/
adjustment values. (If there is a printer option,
execute SIM22-1 to save the counter data and the
adjustment values.) Replace the SCU PWB. Use
SIM16 to cancel the trouble.
Case 3
Cause
SCU PWB EEPROM access circuit trouble
Check and
remedy
remedy
Check that EEPROM is properly set.
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