Read Sharp MX-M350N / MX-M350U / MX-M450N / MX-M450U (serv.man8) Service Manual online
MX-M350/M450 N/U TROUBLE CODES 11 - 11
U1
01
Content
FAX battery abnormality
Detail
FAX backup SRAM battery voltage fall
Cause
Battery life
Battery circuit abnormality
Battery circuit abnormality
Check and
remedy
remedy
Check that the battery voltage is about
2.5V or above.
Check the battery circuit.
2.5V or above.
Check the battery circuit.
02
Content
RTC read abnormality
(common with FAX, on ICU PWB)
(common with FAX, on ICU PWB)
Details
The value read from RTC on ICU PWB
is [EE]h (abnormal).
is [EE]h (abnormal).
Cause
RTC circuit abnormality
Battery voltage fall
Battery circuit abnormality
Battery voltage fall
Battery circuit abnormality
Check &
Remedy
Remedy
Set the time again with key operation,
and check that time advances properly.
Check RTC circuit.
Check that battery voltage is about
2.5V or above.
Check battery circuit.
and check that time advances properly.
Check RTC circuit.
Check that battery voltage is about
2.5V or above.
Check battery circuit.
U2
00
Content
EEPROM read/write error (ICU)
Detail
EEPROM write error
Cause
EEPROM trouble
EEPROM is not initialized.
ICU PWB EEPROM access circuit
trouble
EEPROM is not initialized.
ICU PWB EEPROM access circuit
trouble
Check and
remedy
remedy
Check that EEPROM is properly
inserted.
Save the counter/adjustment values
with the simulation.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.
inserted.
Save the counter/adjustment values
with the simulation.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.
U2
11
Content
Counter check sum error (ICU)
Detail
Counter data area check sum error
Cause
EEPROM trouble
Control circuit trouble by noise
ICU PWB EEPROM access circuit
trouble
Control circuit trouble by noise
ICU PWB EEPROM access circuit
trouble
Check and
remedy
remedy
Check that EEPROM is properly
inserted.
Save the counter/adjustment values
with the DIAG simulation.
Use DIAG (SIM16) to cancel U2
trouble.
Replace the ICU PWB.
inserted.
Save the counter/adjustment values
with the DIAG simulation.
Use DIAG (SIM16) to cancel U2
trouble.
Replace the ICU PWB.
12
Content
Adjustment value check sum error
(ICU)
(ICU)
Detail
Adjustment data area check sum error
Cause
EEPROM trouble
Control circuit trouble by noise
ICU PWB EEPROM access circuit
trouble
Control circuit trouble by noise
ICU PWB EEPROM access circuit
trouble
Check and
remedy
remedy
Check that EEPROM is properly
inserted.
Save the counter/adjustment values
with the simulation.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.
inserted.
Save the counter/adjustment values
with the simulation.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.
MAIN SUB
Details
U2
22
Content
SRAM memory check sum error (ICU)
Detail
MFPC section SRAM memory check
sum error
sum error
Cause
SRAM trouble
Control circuit runaway due to noises
ICU PWB SRAM access circuit trouble
Control circuit runaway due to noises
ICU PWB SRAM access circuit trouble
Check and
remedy
remedy
Initialize the communication
management table registered in the
SRAM and the FAX soft switch.
Since the registered data are deleted,
register the data again.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.
management table registered in the
SRAM and the FAX soft switch.
Since the registered data are deleted,
register the data again.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.
23
Content
SRAM memory individual data check
sum error (ICU)
sum error (ICU)
Detail
Check sum error for every data in the
SRAM memory of the MFPC section
(Communication management table,
sender registration data, etc.)
SRAM memory of the MFPC section
(Communication management table,
sender registration data, etc.)
Cause
SRAM trouble
Control circuit runaway due to noises
ICU PWB SRAM access circuit trouble
Control circuit runaway due to noises
ICU PWB SRAM access circuit trouble
Check and
remedy
remedy
Automatically initialize the data related
to the check sum error by turning OFF/
ON the power.
Since the registered data are deleted,
register the data again.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.
to the check sum error by turning OFF/
ON the power.
Since the registered data are deleted,
register the data again.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.
U2
50
Content
HD section individual data check sum
error (ICU)
error (ICU)
Detail
Check sum error for every individual
data in HD of the MFPC section (One-
touch, Group, Program, etc.)
data in HD of the MFPC section (One-
touch, Group, Program, etc.)
Cause
HDD write/read error
Control circuit runaway due to noises
ICU PWB HD access circuit trouble
Control circuit runaway due to noises
ICU PWB HD access circuit trouble
Check and
remedy
remedy
Automatically initialize the data related
to the check sum error by turning OFF/
ON the power.
Since the registered data are deleted,
register the data again.
Use SIM 16 to cancel the U2 trouble.
Replace the HD PWB.
Replace the ICU PWB.
to the check sum error by turning OFF/
ON the power.
Since the registered data are deleted,
register the data again.
Use SIM 16 to cancel the U2 trouble.
Replace the HD PWB.
Replace the ICU PWB.
80
Content
EEPROM read/write error (Scanner)
Details
Scanner EEPROM write error
Cause
EEPROM abnormality
Scanner PWB EEPROM access circuit
abnormality
Scanner PWB EEPROM access circuit
abnormality
Check &
Remedy
Remedy
Check that EEPROM is set properly.
Record counter/adjustment values with
the simulation to protect the data from
being deleted.
Cancel U2 trouble with SIM 16.
Replace scanner PWB.
Record counter/adjustment values with
the simulation to protect the data from
being deleted.
Cancel U2 trouble with SIM 16.
Replace scanner PWB.
MAIN SUB
Details
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