Sharp AL-2020 Service Manual page 132

Main Sub
code code
L1 00 Content Feeding is not completed within the
specified time after starting feeding. (The
scan head locking switch is locked)
Detail The white area and the black marking on the
shading plate are used to obtain the
difference in the CCD level values for
judgment of lock. When the difference in the
levels of which and black is small, it is judged
that the black mark could not be scanned by
lock and the trouble code "L1" is displayed.
Cause The scan head is locked by the lock switch.
Mirror unit abnormality
The scanner wire is disconnected.
The origin detection sensor abnormality
Mirror motor harness abnormality
Check Check to confirm that the scan head lock
and switch is released.
remedy Use SIM 1-1 to check the mirror
reciprocating operations.
When the mirror does not feed.
Check for disconnection of the scanner wire.
Check the harness and the connector
between the mirror motor and the MCU
PWB.
Replace the mirror unit.
Replace the MCU PWB.
When the mirror does feed.
Use SIM 1-2 to check the mirror home
position sensor.
L3 00 Content Scanner return trouble
Detail When the mirror base is returned for the
specified time (6 sec) in mirror initializing
after turning on the power, the mirror home
position sensor (MHPS) does not turn ON.
Or when the mirror base is returned for the
specified time (about 6 sec) after start of
copy return, the mirror home position sensor
(MHPS) does not turn ON.
Cause Mirror unit abnormality
Scanner wire disconnection
Origin detection sensor abnormality
Mirror motor harness abnormality
Check Use SIM 1-1 to check the mirror
and reciprocating operations.
remedy When the mirror does not return.
Check for disconnection of the scanner wire.
Check the harness and the connector
between the mirror motor and the MCU
PWB.
Replace the mirror unit.
Replace the MCU PWB.
When the mirror does feed.
Use SIM 1-2 to check the mirror home
position sensor.
L4 01 Content Main motor lock detection
Detail When the main motor encoder pulse is not
detected for 100 msec.
Cause Main motor unit abnormality
Improper connection or disconnection the
main motor and the harness.
MCU PWB abnormality
Check Use SIM 25-01 to check the main motor
and operations.
remedy Check connection of the main motor
harness/connector.
Replace the main motor.
Replace the MCU PWB.
Details of trouble
AL-2020/2035/2040/2050/2060 SIMULATION, TROUBLE CODES 10 - 42
Main Sub
code code
L4 32 Content Exhaust fan motor lock detection trouble
Detail The error detection is started after 2 sec
from starting rotation of the exhaust fan
motor.
1) The continuous rotation state of 250ms is
not detected for 1 sec after starting
detection.
2) When the lock sensor (in the exhaust fan)
detects the HIGH level (unstable) after
detection the lock state (stable state).
Cause Exhaust fan motor connector connection
trouble
Exhaust fan motor trouble
MCU PWB trouble
Check Exhaust fan motor connector connection
and check
remedy Exhaust fan motor replacement
Replace the MCU PWB.
L6 10 Content Polygon motor lock detection
Detail The lock signal (specified rpm signal) does
not return within a certain time (about 20
sec) from starting the polygon motor
rotation.
Cause Polygon motor unit abnormality
Improper connection or disconnection of the
polygon motor and the harness.
MCU PWB abnormality
Check Use SIM 61-1 to check the polygon motor
and operations.
remedy Check connection of the polygon motor
harness/connector.
Replace the polygon motor.
Replace the MCU PWB.
U1 03 Content FAX board battery error (AL-2060 only)
Details The SRAM backup battery voltage on FAX
PWB falls.
Cause The SRAM backup battery voltage on FAX
PWB falls.
Check Check voltage of the SRAM back up battery.
and Replace the battery.
remedy
U2 04 Content EEPROM read/write error (Serial
communication error)
Detail EEPROM access process error
Cause EEPROM abnormality
Check Check that the EEPROM is properly set.
and Use SIM 16 to cancel the trouble.
remedy Replace the MCU PWB.
11 Content Counter check sum error (EEPROM)
Detail Check sum error of the counter area in the
EEPROM
Cause EEPROM abnormality
Check Check that the EEPROM is properly set.
and Use SIM 16 to cancel the trouble.
remedy Replace the MCU PWB.
Details of trouble