Sharp MX-M350, Service Manual, Page: 243 / 276

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
Check and
remedy Check that the battery voltage is about
2.5V or above.
Check the battery circuit.
02 Content RTC read abnormality
(common with FAX, on ICU PWB)
Details The value read from RTC on ICU PWB
is [EE]h (abnormal).
Cause RTC circuit abnormality
Battery voltage fall
Battery circuit abnormality
Check &
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.
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
Check and
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.
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
Check and
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.
12 Content Adjustment value check sum error
(ICU)
Detail Adjustment data area check sum error
Cause EEPROM trouble
Control circuit trouble by noise
ICU PWB EEPROM access circuit
trouble
Check and
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.
MAIN SUB Details
U2 22 Content SRAM memory check sum error (ICU)
Detail MFPC section SRAM memory check
sum error
Cause SRAM trouble
Control circuit runaway due to noises
ICU PWB SRAM access circuit trouble
Check and
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.
23 Content SRAM memory individual data check
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.)
Cause SRAM trouble
Control circuit runaway due to noises
ICU PWB SRAM access circuit trouble
Check and
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.
U2 50 Content HD section individual data check sum
error (ICU)
Detail Check sum error for every individual
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
Check and
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.
80 Content EEPROM read/write error (Scanner)
Details Scanner EEPROM write error
Cause EEPROM abnormality
Scanner PWB EEPROM access circuit
abnormality
Check &
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.
MAIN SUB Details