Sharp AR-M450 Service Manual page 143

MAIN SUB
EE EL Content Auto developer adjustment trouble
(Over-toner)
Detail The sample data is at 68 or below when auto
developer adjustment is performed.
Cause Toner concentration sensor trouble
Charging voltage, developing voltage
abnormality
Insufficient toner concentration
Developing unit trouble
PCU PWB trouble
Check and Use DIAG (SIM25-2) to perform auto
remedy developer adjustment.
EU Content Auto developer adjustment trouble
(Under-toner)
Detail The sample data is of 168 or above when
auto developer adjustment is performed.
Cause Insufficient toner concentration
Charging voltage, developing voltage
abnormality
Insufficient toner concentration
Developing unit trouble
PCU PWB trouble
Check and Use DIAG (SIM25-2) to perform auto
remedy developer adjustment.
F9 02 Content PRT Centro port check error
Detail Controller Centro port trouble
Cause Centro port trouble
Controller PWB trouble
Check and Replace the Controller PWB.
remedy
03 Content NIC port check error
Detail NIC port check error
Cause NIC port trouble
NIC PWB trouble
Controller PWB trouble
Check and Replace the NIC PWB.
remedy Replace the Controller PWB.
U1 01 Content FAX Battery abnormality
Detail Backup SRAM battery voltage fall
Cause Battery life
Battery circuit abnormality
Check and Check that the battery voltage is about 2.5V
remedy 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 & Set the time again with key operation, and
Remedy check that time advances properly.
Check RTC circuit.
Check that battery voltage is about 2.5V or
above.
Check battery circuit.
MAIN SUB
U2 00
11
12
80
81
AR-M350 TROUBLE CODES 11-9
Content EEPROM read/write error (Controller)
Detail EEPROM write error
Cause EEPROM trouble
EEPROM is not initialized.
Controller PWB EEPROM access circuit
trouble
Check and Check that EEPROM is properly inserted.
remedy Save the counter/adjustment values with the
DIAG simulation.
Use DIAG (SIM16) to cancel U2 trouble.
Replace the Controller PWB.
Content Counter check sum error (Controller)
Detail Counter data area check sum error
Cause EEPROM trouble
Control circuit trouble by noise
Controller PWB EEPROM access circuit
trouble
Check and Check that EEPROM is properly inserted.
remedy Save the counter/adjustment values with the
DIAG simulation.
Use DIAG (SIM16) to cancel U2 trouble.
Replace the Controller PWB.
Content Adjustment value check sum error
(Controller)
Detail Adjustment data area check sum error
Cause EEPROM trouble
Control circuit trouble by noise
Controller PWB EEPROM access circuit
trouble
Check and Check that EEPROM is properly inserted.
remedy Save the counter/adjustment values with the
DIAG simulation.
Use DIAG (SIM16) to cancel U2 trouble.
Replace the Controller PWB.
Content EEPROM read/write error (Scanner)
Details Scanner EEPROM write error
Cause EEPROM abnormality
EEPROM which is not initialized is installed.
Hang of control circuit due to noises
Scanner PWB EEPROM access circuit
abnormality
Check & Check that EEPROM is set properly.
Remedy Record counter/adjustment values with the
simulation to protect the data from being
deleted.
Cancel U2 trouble with SIM 16.
Replace scanner PWB.
Content Memory check sum error (Scanner)
Details Scanner memory check sum error
Cause EEPROM trouble
Control circuit freeze by noises
Scanner PWB EEPROM access circuit
trouble
Check & Check that EEPROM is set properly.
Remedy Record counter/adjustment values with the
simulation to protect the data from being
deleted.
Cancel U2 trouble with SIM 16.
Replace scanner PWB.