Sharp AL-1661CS, Service Manual, Page: 145 / 216

AL-1661CS TEST COMMAND, FAX SOFT SWITCH, TROUBLE CODES 10 - 69
H3 00 Content Heat roller high temperature detection
Detail
The fusing temperature exceeds 240°C.
Cause Thermistor abnormality
Control PWB abnormality
Fusing section connector disconnection.
Check
and
remedy Use TC 5-02 to check the heater lamp blinking
operation.
When the lamp blinks normally.
Check the thermistor and its harness.
Check the thermistor input circuit on the control
PWB.
When the lamp keeps ON.
Check the power PWB and the lamp control
circuit on the MCU PWB.
Use TC 14 to clear the self diagnostic display.
H4 00 Content Heat roller low temperature detection
Detail The fusing temperature does not reach 185°C
within 27 sec of turning on the power, or the
fusing temperature keeps at 140°C.
Cause Thermistor abnormality
Heater lamp abnormality
Thermostat abnormality
Control PWB abnormality
Check
and
remedy Use TC 5-02 to check the heater lamp blinking
operation.
When the lamp blinks normally.
Check the thermistor and its harness.
Check the thermistor input circuit on the control
PWB.
When the lamp does not light up.
Check for disconnection of the heater lamp and
the thermostat. Check the interlock switch.
Check the power PWB and the lamp control
circuit on the MCU PWB.
Use TC 14 to clear the self diagnostic display.
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
and
remedy Check to confirm that the scan head lock switch
is released.
Use TC 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 TC 1-2 to check the mirror home position
sensor.
Main
code Sub
code
Details of trouble
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
and
remedy Use TC 1-1 to check the mirror reciprocating
operations.
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 TC 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
and
remedy Use TC 25-01 to check the main motor
operations.
Check connection of the main motor harness/
connector.
Replace the main motor.
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
and
remedy Use TC 61-1 to check the polygon motor
operations.
Check connection of the polygon motor
harness/connector.
Replace the polygon motor.
Replace the MCU PWB.
U1 03 Content FAX board battery error
Details The SRAM backup battery voltage on FAX
PWB falls.
Cause The SRAM backup battery voltage on FAX
PWB falls.
Check
and
remedy Check voltage of the SRAM back up battery.
Replace the battery.
Main
code Sub
code
Details of trouble