Read Sharp MX-6240N / MX-7040N (serv.man26) Service Manual online
MX-7040N TROUBLESHOOTING 7 – 49
U6-49
LCT3 lift trouble
U6-51
LCC - Main unit combination trouble
U6-53
Communication trouble between
LCT’s
U6-54
Option installation combination
trouble
U6-63
Manual feed tray descending trouble
U6-68
Manual feed tray p aper feed position
abnormality
U6-69
Manual feed tray lift trouble
Trouble content
The upper limit is not detected within the specified
time (A4 LCC: 10sec, A3 LCC: 8sec) when lifting.
(A3 3-stage LCT / A4 3-stage LCT)
The upper limit is not detected within the specified
time when lifting. The limit SW ON is detected when
lifting. The encoder signal does not vary when lifting.
(A3 2-stage LCT)
time (A4 LCC: 10sec, A3 LCC: 8sec) when lifting.
(A3 3-stage LCT / A4 3-stage LCT)
The upper limit is not detected within the specified
time when lifting. The limit SW ON is detected when
lifting. The encoder signal does not vary when lifting.
(A3 2-stage LCT)
Detail
PCU
Cause
Upper limit sensor abnormality, tray lift motor lock,
connector and harness connection trouble, PWB
trouble (A3 3-stage LCT / A4 3-stage LCT)
Sensor trouble, upper limit SW trouble, A3 2-stage
LCT control PWB trouble, broken gear, lift motor
trouble (A3 2-stage LCT)
connector and harness connection trouble, PWB
trouble (A3 3-stage LCT / A4 3-stage LCT)
Sensor trouble, upper limit SW trouble, A3 2-stage
LCT control PWB trouble, broken gear, lift motor
trouble (A3 2-stage LCT)
Check & Remedy
Use SIM04-02 and SIM04-03 to check the operation
of the upper limit sensor and the lift operation. Check
the wiring.
Fix the trouble, and use SIM15 to cancel the trouble.
(A3 3-stage LCT / A4 3-stage LCT)
Use SIM04-02 and SIM04-03 to check the operation
of the upper limit sensor, the upper limit SW, the
encoder sensor, and the lift motor.
Fix the trouble, and use SIM15 to cancel the trouble.
(A3 2-stage LCT)
of the upper limit sensor and the lift operation. Check
the wiring.
Fix the trouble, and use SIM15 to cancel the trouble.
(A3 3-stage LCT / A4 3-stage LCT)
Use SIM04-02 and SIM04-03 to check the operation
of the upper limit sensor, the upper limit SW, the
encoder sensor, and the lift motor.
Fix the trouble, and use SIM15 to cancel the trouble.
(A3 2-stage LCT)
Trouble content
An LCC of a different model which is not supported by
the machine is installed. (Improper combination of the
machine and the LCC model code.)
the machine is installed. (Improper combination of the
machine and the LCC model code.)
Detail
PCU
Cause
LCC control PWB trouble
PCU PWB trouble
PCU PWB trouble
Check & Remedy
Check to confirm the LCC model.
Check the LCC control PWB, and replace if
necessary.
Check the PCU PWB, and replace if necessary.
Check the LCC control PWB, and replace if
necessary.
Check the PCU PWB, and replace if necessary.
Trouble content
Communication error between the A3 2-stage LCT (1
series) and the A3 2-stage LCT (2 series)
Communication test error when turning ON the power
or after canceling the exclusive simulation.
series) and the A3 2-stage LCT (2 series)
Communication test error when turning ON the power
or after canceling the exclusive simulation.
Detail
PCU
Cause
Connection trouble or disconnection of the connector
and the harness
A3 2-stage LCT (1 series) control PWB trouble, A3 2-
stage LCT (2 series) control PWB trouble
Malfunction caused by noises
and the harness
A3 2-stage LCT (1 series) control PWB trouble, A3 2-
stage LCT (2 series) control PWB trouble
Malfunction caused by noises
Check & Remedy
Cancel the trouble by turning OFF/ON the power.
Check the connector and the harness of the
communication line.
Replace the A3 2-stage LCT control PWB.
Check the connector and the harness of the
communication line.
Replace the A3 2-stage LCT control PWB.
Trouble content
Relay unit installation detection signal abnormality,
front LCT installation detection signal abnormality, 2-
series installation detection signal abnormality
front LCT installation detection signal abnormality, 2-
series installation detection signal abnormality
Detail
PCU
Cause
Combination error
Connection trouble of the connector and the harness
A3 2-stage LCT control PWB trouble
Connection trouble of the connector and the harness
A3 2-stage LCT control PWB trouble
Check & Remedy
Check the combination of options.
Check connection of the harness and the connector
from control PWB to each option unit.
Replace the A3 2-stage LCT control PWB.
Check connection of the harness and the connector
from control PWB to each option unit.
Replace the A3 2-stage LCT control PWB.
Trouble content
The lower limit position is not detected within the
specified time (10sec) from the start of descending the
manual feed tray.
specified time (10sec) from the start of descending the
manual feed tray.
Detail
PCU
Cause
Lower limit sensor trouble.
Manual feed tray lift motor lock.
Connection trouble of the connector and the harness.
PWB trouble.
Manual feed tray lift motor lock.
Connection trouble of the connector and the harness.
PWB trouble.
Check & Remedy
Use SIM04-02 and SIM04-03 to check the operations
of the lower limit position sensor and the manual fed
tray lift motor.
Wiring check.
Fix the trouble, and use SIM15 to cancel the trouble.
of the lower limit position sensor and the manual fed
tray lift motor.
Wiring check.
Fix the trouble, and use SIM15 to cancel the trouble.
Trouble content
The upper limit sensor turns OFF before turning ON
the pickup SOL. (Normally the upper limit sensor turns
OFF after turning OFF the pickup SOL when starting
lifting up.)
the pickup SOL. (Normally the upper limit sensor turns
OFF after turning OFF the pickup SOL when starting
lifting up.)
Detail
PCU
Cause
Sensor trouble.
Connection trouble of the connector and the harness.
PWB trouble.
The pickup roller remains in the lower position.
(Mechanism trouble)
Connection trouble of the connector and the harness.
PWB trouble.
The pickup roller remains in the lower position.
(Mechanism trouble)
Check & Remedy
Use SIM04-02 and SIM04-03 to check the operations
of the upper limit sensor and lift operations.
Wiring check.
of the upper limit sensor and lift operations.
Wiring check.
Trouble content
The upper limit is not detected within the specified
time (10sec) when lifting up.
time (10sec) when lifting up.
Detail
PCU
Cause
Upper limit sensor trouble.
Tray lift motor lock.
Connection trouble of the connector and the harness.
PWB trouble.
Tray lift motor lock.
Connection trouble of the connector and the harness.
PWB trouble.
Check & Remedy
Use SIM04-02 and SIM04-03 to check the operations
of the upper limit sensor and lift operations.
Wiring check.
Fix the trouble, and use SIM15 to cancel the trouble.
of the upper limit sensor and lift operations.
Wiring check.
Fix the trouble, and use SIM15 to cancel the trouble.
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