Sharp AR-M455N Service Manual page 227

MAIN SUB
L4 01 Content Main motor lock detection
Detail The motor lock signal is detected for
1.5sec during rotation of the main
motor.
Cause main motor trouble
Check connection of harness between
the PCU PWB and the main motor.
Control circuit trouble
Check and Use SIM25-1 to check the main motor
remedy operation.
Check harness and connector between
the PCU PWB and the main motor.
02 Content Drum motor lock detection
Detail The motor lock signal is detected for
1.5sec during rotation of the drum
motor.
Cause Drum motor trouble
Improper connection of harness
between the PCU PWB and the drum
motor.
Control circuit trouble
Check and Use SIM6-1 to check the drum motor
remedy operation.
Check harness and connector between
the PCU PWB and the drum motor.
30 Content Controller fan motor lock detection
Detail The motor lock signal is detected
during rotation of the controller fan
motor.
The motor lock signal is detected
during rotation of the HDD fan motor.
Cause Fan motor trouble
Improper connection of the harness
between the controller PWB and the
fan motor.
Control circuit trouble
Check and Use SIM 6-2 to check the fan motor
remedy operation.
Check the harness and the connector
between the controller PWB and the
fan motor.
L6 10 Content Polygon motor lock detection
Detail It is judged that the polygon motor lock
signal is not outputted.
Lock signal is checked in the interval of
10sec after starting the polygon motor,
and it is judged that the polygon motor
does not rotate normally.
Cause The LSU connector or harness in the
LSU is disconnected or broken.
Polygon motor trouble
Check and Use SIM61-1 to check the polygon
remedy motor operation.
Check connector and harness
connection.
Replace LSU.
Details
AR-M355N/M455N TROUBLE CODES 11 - 10
MAIN SUB
L8 01 Content No fullwave signal
Detail Full wave signal is not detected.
Cause The PCU PWB connector or the power
unit harness is disconnected or broken.
PCU PWB trouble
12V power source trouble
Check and Check connection of the harness and
remedy connector.
Replace PCU PWB.
Replace the power unit.
Replace the controller connection
mother board.
02 Content Full wave signal width abnormality
Detail It is judged as full wave signal
frequency abnormality.
(When the detection cycle is judged as
69Hz or above or 42.5Hz or below)
Cause The connector or harness of the PCU
PWB and the power PWB is
disconnected.
PCU PWB trouble
Power unit trouble
Check and Check connection of the harness and
remedy connector.
Replace the PCU PWB.
Replace the power unit.
U1 01 Content FAX battery abnormality
Detail FAX backup SRAM battery voltage fall
Cause Battery life
Battery circuit abnormality
Check and Check that the battery voltage is about
remedy 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 & Set the time again with key operation,
Remedy 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 Check that EEPROM is properly
remedy inserted.
Save the counter/adjustment values
with the simulation.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.
Details