Sharp AL-840 (serv.man7) Service Manual ▷ View online
Purpose
Section
Item
Function (Purpose)
Code
Main
Sub
Adjustment
Picture quality
Used to adjust the copy image position o
the print paper in the copy mode and to
adjust the void area (image loss).
the print paper in the copy mode and to
adjust the void area (image loss).
50
1
Picture quality
Density
Used to adjust the copy density.
(The print density in each mode and the
overall print density (overall setting of the
specified density gradient) can be
adjusted.
(The print density in each mode and the
overall print density (overall setting of the
specified density gradient) can be
adjusted.
46
1
ICU
Picture quality
Used to adjust the main scanning
direction print image position. (Main
scanning direction void area adjustment)
direction print image position. (Main
scanning direction void area adjustment)
50
10
Adjustment/Operation
test/check
test/check
Image process
(Photoconductor/
Developing/Transfer/
Cleaning)
(Photoconductor/
Developing/Transfer/
Cleaning)
Used to adjust and check the operation
of the developing bias voltage, the main
charger voltage, and the transfer charger
voltage, and their control circuit.
of the developing bias voltage, the main
charger voltage, and the transfer charger
voltage, and their control circuit.
8
2
Setting
Specifications
Used to set the destination.
26
6
Specifications
Operation
mode
(Common)
mode
(Common)
Used to set the rear void area YES/NO.
20
Specifications
Operation
mode
(Common)
mode
(Common)
Used to set the power save mode
YES/NO.
YES/NO.
26
Specifications
Operation
mode
(Common)
mode
(Common)
Used to set the photoconductor drum
operation inhibit YES/NO when the life is
reached.
operation inhibit YES/NO when the life is
reached.
38
Fixing (Fusing)
Specifications
Operation
mode
(Common)
mode
(Common)
Used to set the CE mark conforming
operation mode. (For prevention against
flicker when driving the fusing heater
lamp)
operation mode. (For prevention against
flicker when driving the fusing heater
lamp)
30
Fixing (Fusing)
Operation
Used to set the fusing temperature.
43
1
Fixing (Fusing)
Operation
Used to set the fusing temperature after
20th sheet in the multi print mode.
20th sheet in the multi print mode.
4
Laser (Exposure)
Specifications
Operation
mode
(Common)
mode
(Common)
Used to set the scanner (writing) motor
OFF timing.
OFF timing.
26
40
Operation test/check
Operation
Used to check the operation of the
sensors and detectors in the paper feed
section, the paper transport section, and
the paper exit section and their control
circuit.
sensors and detectors in the paper feed
section, the paper transport section, and
the paper exit section and their control
circuit.
30
1
Paper transport
Operation
Used to check the operation of the paper
feed (clutch, solenoid and its control
circuit.
feed (clutch, solenoid and its control
circuit.
6
1
Optical (Image
scanning)
scanning)
Operation
Used to check the operation of the
scanner (reading) unit and its control
circuit.
scanner (reading) unit and its control
circuit.
1
1
Optical (Image
scanning)
scanning)
Operation
Used to check the operation of the copy
lamp and its control circuit.
lamp and its control circuit.
5
3
Image process
(Photoconductor/
Developing/Transfer/
Cleaning)
(Photoconductor/
Developing/Transfer/
Cleaning)
Used to check the developing bias
voltage, the main charger voltage, and
the transfer charger voltage and the
operation of their control circuit.
voltage, the main charger voltage, and
the transfer charger voltage and the
operation of their control circuit.
8
1
Image process
(Photoconductor/
Developing/Transfer/
Cleaning)
(Photoconductor/
Developing/Transfer/
Cleaning)
Used to check the operation of each
voltage of the main charger and its
control circuit.
voltage of the main charger and its
control circuit.
3
Operation (Display/
Operation key)
Operation key)
Operation
Used to check the operation of the
operation panel display lamps and the
control circuit.
operation panel display lamps and the
control circuit.
5
1
Fixing (Fusing)
Operation
Used to check the operation of the
heater lamp and its control circuit. Used
to check the operation of the fan motor
and its control circuit.
heater lamp and its control circuit. Used
to check the operation of the fan motor
and its control circuit.
2
DRIVE
Operation
Used to check the operation of the main
drive (excluding the scanner (reading)
section) section.
drive (excluding the scanner (reading)
section) section.
25
1
8 – 5
Purpose
Section
Item
Function (Purpose)
Code
Main
Sub
Operation test/check
Printer
Operation
Used to check the operation (self print
operation) of the printer section.
operation) of the printer section.
64
1
Laser (Exposure)
Operation
Used to check the operation of the
scanner (writing) motor and its control
circuit.
scanner (writing) motor and its control
circuit.
25
10
Laser (Exposure)
Operation
Used to check the operation of the
scanner (writing) section.
scanner (writing) section.
61
3
Others
Used to check the warm up time and the
operation of all the units and to make
aging (intermittent operation) with
copying. Each section can be checked
during copying.
operation of all the units and to make
aging (intermittent operation) with
copying. Each section can be checked
during copying.
7
6
Others
Operation
Used to check the warm up time and the
operation of all the units and to make
aging with copying. Each section can be
checked during copying.
operation of all the units and to make
aging with copying. Each section can be
checked during copying.
1
Others
Operation
Used to check the warm up time and the
operation of all the units and to make
aging with copying. Each section can be
checked during copying. (In this
simulation, the detection functions of
paper presence/empty and a paper jam
disabled.)
operation of all the units and to make
aging with copying. Each section can be
checked during copying. (In this
simulation, the detection functions of
paper presence/empty and a paper jam
disabled.)
2
Data clear
Optical (Image
scanning)
scanning)
Counter
Used to clear the count of use (count of
scanning) of the scanner (reading) unit.
scanning) of the scanner (reading) unit.
24
13
Image process
(Photoconductor/
Developing/Transfer/
Cleaning)
(Photoconductor/
Developing/Transfer/
Cleaning)
Photo
conductor
conductor
Counter
Used to clear the photoconductor drum
counter.
counter.
7
Clear/Cancel (Trouble
etc.)
etc.)
Trouble
Error
Used to cancel the self diag other than
U2 trouble.
U2 trouble.
14
0
Trouble
Error
Used to cancel the self diag U2 trouble.
16
0
Operation data
output/Check
(Display/Print)
output/Check
(Display/Print)
Optical (Image
scanning)
scanning)
Counter
Used to check the count of use (count of
scanning) of the scanner (reading) unit.
scanning) of the scanner (reading) unit.
22
21
Optical (Image
scanning)
scanning)
Operation
Used to check the result of shading
correction. (The shading correction data
is displayed.)
correction. (The shading correction data
is displayed.)
63
1
Optical (Image
scanning)
scanning)
Operation
Used to check the result of shading
correction (dark component). (The
shading correction (dark component) data
is displayed.)
correction (dark component). (The
shading correction (dark component) data
is displayed.)
2
Optical (Image
scanning)
scanning)
Operation
Used to set the scanner (reading)
section’s operation ENABLE/DISABLE. In
case of a breakdown of the scanner
(reading) section, if this simulation is set
to DISABLE, the machine can be used
only as a printer.
section’s operation ENABLE/DISABLE. In
case of a breakdown of the scanner
(reading) section, if this simulation is set
to DISABLE, the machine can be used
only as a printer.
64
2
Image process
(Photoconductor/
Developing/Transfer/
Cleaning)
(Photoconductor/
Developing/Transfer/
Cleaning)
Photo
conductor
conductor
Counter
Used to check the print count value of
the photoconductor.
the photoconductor.
22
12
PCU
Specifications
Operation
mode
(Common)
mode
(Common)
Used to check the machine (hardware)
specifications.
specifications.
26
7
User data output/Check
(Display/Print)
(Display/Print)
Counter
Total
Used to check the total counter value.
22
5
Others
PCU
Software
Used to check the ROM version.
14
c. Section
Section
Purpose
Item
Function (Purpose)
Code
Main
Sub
Paper transport
Operation test/check
Operation
Used to check the operation of the paper
feed (clutch, solenoid and its control
circuit.
feed (clutch, solenoid and its control
circuit.
6
1
Optical (Image
scanning)
scanning)
Operation data
output/Check
(Display/Print)
output/Check
(Display/Print)
Counter
Used to check the count of use (count of
scanning) of the scanner (reading) unit.
scanning) of the scanner (reading) unit.
22
21
Data clear
Counter
Used to clear the count of use (count of
scanning) of the scanner (reading) unit.
scanning) of the scanner (reading) unit.
24
13
8 – 6
Section
Purpose
Item
Function (Purpose)
Code
Main
Sub
Optical (Image
scanning)
scanning)
Operation test/check
Operation
Used to check the operation of the
scanner (reading) unit and its control
circuit.
scanner (reading) unit and its control
circuit.
1
1
Operation test/check
Operation
Used to check the operation of the copy
lamp and its control circuit.
lamp and its control circuit.
5
3
Operation data
output/Check
(Display/Print)
output/Check
(Display/Print)
Operation
Used to check the result of shading
correction. (The shading correction data
is displayed.)
correction. (The shading correction data
is displayed.)
63
1
Operation data
output/Check
(Display/Print)
output/Check
(Display/Print)
Operation
Used to check the result of shading
correction (dark component). (The
shading correction (dark component) data
is displayed.)
correction (dark component). (The
shading correction (dark component) data
is displayed.)
2
Operation data
output/Check
(Display/Print)
output/Check
(Display/Print)
Operation
Used to set the scanner (reading)
section’s operation ENABLE/DISABLE. In
case of a breakdown of the scanner
(reading) section, if this simulation is set
to DISABLE, the machine can be used
only as a printer.
section’s operation ENABLE/DISABLE. In
case of a breakdown of the scanner
(reading) section, if this simulation is set
to DISABLE, the machine can be used
only as a printer.
64
2
Image process
(Photoconductor/
Developing/Transfer/
Cleaning)
(Photoconductor/
Developing/Transfer/
Cleaning)
Operation test/check
Used to check the developing bias
voltage, the main charger voltage, and
the transfer charger voltage and the
operation of their control circuit.
voltage, the main charger voltage, and
the transfer charger voltage and the
operation of their control circuit.
8
1
Adjustment/Operation
test/check
test/check
Used to adjust and check the operation
of the developing bias voltage, the main
charger voltage, and the transfer charger
voltage, and their control circuit.
of the developing bias voltage, the main
charger voltage, and the transfer charger
voltage, and their control circuit.
2
Operation test/check
Used to check the operation of each
voltage of the main charger and its
control circuit.
voltage of the main charger and its
control circuit.
3
Photo
conductor
conductor
Operation data
output/Check
(Display/Print)
output/Check
(Display/Print)
Counter
Used to check the print count value of
the photoconductor.
the photoconductor.
22
12
Data clear
Counter
Used to clear the photoconductor drum
counter.
counter.
24
7
Operation (Display/
Operation key)
Operation key)
Operation test/check
Operation
Used to check the operation of the
operation panel display lamps and the
control circuit.
operation panel display lamps and the
control circuit.
5
1
Fixing (Fusing)
Setting
Specifications
Operation
mode
(Common)
mode
(Common)
Used to set the CE mark conforming
operation mode. (For prevention against
flicker when driving the fusing heater
lamp)
operation mode. (For prevention against
flicker when driving the fusing heater
lamp)
26
30
Operation test/check
Operation
Used to check the operation of the
heater lamp and its control circuit. Used
to check the operation of the fan motor
and its control circuit.
heater lamp and its control circuit. Used
to check the operation of the fan motor
and its control circuit.
5
2
Setting
Operation
Used to set the fusing temperature.
43
1
Setting
Operation
Used to set the fusing temperature after
20th sheet in the multi print mode.
20th sheet in the multi print mode.
4
DRIVE
Operation test/check
Operation
Used to check the operation of the main
drive (excluding the scanner (reading)
section) section.
drive (excluding the scanner (reading)
section) section.
25
1
PCU
Operation data
output/Check
(Display/Print)
output/Check
(Display/Print)
Specifications
Operation
mode
(Common)
mode
(Common)
Used to check the machine (hardware)
specifications.
specifications.
26
7
Setting
Specifications
Operation
mode
(Common)
mode
(Common)
Used to set MCU memory YES/NO.
39
Others
Software
Used to check the ROM version.
22
14
ICU
Adjustment
Picture quality
Used to adjust the main scanning
direction print image position. (Main
scanning direction void area adjustment)
direction print image position. (Main
scanning direction void area adjustment)
50
10
Printer
Operation test/check
Operation
Used to check the operation (self print
operation) of the printer section.
operation) of the printer section.
64
1
Laser (Exposure)
Setting
Specifications
Operation
mode
(Common)
mode
(Common)
Used to set the scanner (writing) motor
OFF timing.
OFF timing.
26
40
Operation test/check
Operation
Used to check the operation of the
scanner (writing) motor and its control
circuit.
scanner (writing) motor and its control
circuit.
25
10
8 – 7
Section
Purpose
Item
Function (Purpose)
Code
Main
Sub
Laser (Exposure)
Operation test/check
Operation
Used to check the operation of the
scanner (writing) section.
scanner (writing) section.
61
3
Others
Operation test/check
Used to check the warm up time and the
operation of all the units and to make
aging (intermittent operation) with
copying. Each section can be checked
during copying.
operation of all the units and to make
aging (intermittent operation) with
copying. Each section can be checked
during copying.
7
6
Operation test/check
Operation
Used to check the warm up time and the
operation of all the units and to make
aging with copying. Each section can be
checked during copying.
operation of all the units and to make
aging with copying. Each section can be
checked during copying.
1
Operation test/check
Operation
Used to check the warm up time and the
operation of all the units and to make
aging with copying. Each section can be
checked during copying. (In this
simulation, the detection functions of
paper presence/empty and a paper jam
disabled.)
operation of all the units and to make
aging with copying. Each section can be
checked during copying. (In this
simulation, the detection functions of
paper presence/empty and a paper jam
disabled.)
2
d. Item
Item
Purpose
Section
Function (Purpose)
Code
Main
Sub
Picture quality
Adjustment
Used to adjust the coy magnification ratio
(in the main scanning direction and the
sub scanning direction).
(in the main scanning direction and the
sub scanning direction).
48
1
Adjustment
Used to adjust the copy image position o
the print paper in the copy mode and to
adjust the void area (image loss).
the print paper in the copy mode and to
adjust the void area (image loss).
50
1
Adjustment
ICU
Used to adjust the main scanning
direction print image position. (Main
scanning direction void area adjustment)
direction print image position. (Main
scanning direction void area adjustment)
10
Density
Adjustment
Used to adjust the copy density.
(The print density in each mode and the
overall print density (overall setting of the
specified density gradient) can be
adjusted.
(The print density in each mode and the
overall print density (overall setting of the
specified density gradient) can be
adjusted.
46
1
Specifications
Setting
Used to set the destination.
26
6
Operation
mode
(Common)
mode
(Common)
Setting
Used to set the rear void area YES/NO.
20
Setting
Used to set the power save mode
YES/NO.
YES/NO.
26
Setting
Used to set the photoconductor drum
operation inhibit YES/NO when the life is
reached.
operation inhibit YES/NO when the life is
reached.
38
Setting
Fixing (Fusing)
Used to set the CE mark conforming
operation mode. (For prevention against
flicker when driving the fusing heater
lamp)
operation mode. (For prevention against
flicker when driving the fusing heater
lamp)
30
Setting
PCU
Used to set MCU memory YES/NO.
39
Operation data
output/Check
(Display/Print)
output/Check
(Display/Print)
PCU
Used to check the machine (hardware)
specifications.
specifications.
7
Setting
Laser (Exposure)
Used to set the scanner (writing) motor
OFF timing.
OFF timing.
40
Trouble
Error
Clear/Cancel (Trouble
etc.)
etc.)
Used to cancel the self diag other than
U2 trouble.
U2 trouble.
14
0
Clear/Cancel (Trouble
etc.)
etc.)
Used to cancel the self diag U2 trouble.
16
0
Software
Others
PCU
Used to check the ROM version.
22
14
Counter
Data clear
Optical (Image
scanning)
scanning)
Used to clear the count of use (count of
scanning) of the scanner (reading) unit.
scanning) of the scanner (reading) unit.
24
13
Operation data
output/Check
(Display/Print)
output/Check
(Display/Print)
Optical (Image
scanning)
scanning)
Used to check the count of use (count of
scanning) of the scanner (reading) unit.
scanning) of the scanner (reading) unit.
22
21
Data clear
Image process
(Photoconductor/
Developing/Transfer/
Cleaning)
(Photoconductor/
Developing/Transfer/
Cleaning)
Photo
conductor
conductor
Used to clear the photoconductor drum
counter.
counter.
24
7
8 – 8
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