Sharp AR-M35 / AR-M450 (serv.man8) Service Manual ▷ View online
AR-350/450 BASIC PROCESS SECTION 5-2
B. Load voltage, current
Load voltage, current name
Default
Remark
MC grid
AE mode
-650V±5V
The main charger voltage in each mode.
Affects the charging level of the OPC drum.
Affects the charging level of the OPC drum.
Text mode
-650V±5V
Text/Photo mode
-650V±5V
Photo mode
-650V±5V
Printer mode
-650V±5V
Fax mode
-650V±5V
Developing
bias
bias
AE mode
-500V±5V
The applied voltage of the MG roller in each mode.
Affects the charging level of toner.
If the charging level of toner is improper, it may cause improper print density or toner splash.
Affects the charging level of toner.
If the charging level of toner is improper, it may cause improper print density or toner splash.
Text mode
-500V±5V
Text/Photo mode
-500V±5V
Photo mode
-500V±5V
Printer mode
-500V±5V
Fax mode
-500V±5V
Developing positive bias
-150V±5V
Used to remove remaining toner from the OPC drum.
Transfer
current
current
Front
35PPM
19µA
The current is used to attract toner on the OPC drum to paper.
Varies depending on the print speed and duplex printing conditions.
Varies depending on the print speed and duplex printing conditions.
45PPM
25µA
Back
35PPM
25µA
45PPM
30µA
Separation
voltage
voltage
Front
-1.8KV±0.1KV
The current is used to separate paper from the OPC drum.
Back
-1.8KV±0.1KV
Transfer voltage
-800V±10V
Used to remove remaining toner from the transfer roller.
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AR-350/450 BASIC PROCESS SECTION 5-3
2. Process control
A. List of process correction (image forming section correction) operations
Item
No.
Correction items
Factor
Purpose/Effect
Changed item
Correction base
factor
Correction reset
conditions
1
Photoconductor
characteristics
correction
characteristics
correction
Laser beam
power
correction
power
correction
A decrease in
optical
sensitivity
caused by
photoconducto
r membrane
decrease and
electrical and
optical stress
optical
sensitivity
caused by
photoconducto
r membrane
decrease and
electrical and
optical stress
To correct a decrease in optical
sensitivity caused by
photoconductor membrane
decrease and electrical and
optical stress and to keep the
bright potential at a constant
level, maintaining the proper
density of print.
sensitivity caused by
photoconductor membrane
decrease and electrical and
optical stress and to keep the
bright potential at a constant
level, maintaining the proper
density of print.
Laser beam power
(LD1)
(LD1)
Photoconductor
rotation time
(timer)
rotation time
(timer)
CRU model
Correction is reset
when the IC chip in
the toner hopper is
replaced at toner
replacement. In the
DM series, toner and
the photoconductor
drum cartridge are
replaced together.
SRU model
when the IC chip in
the toner hopper is
replaced at toner
replacement. In the
DM series, toner and
the photoconductor
drum cartridge are
replaced together.
SRU model
Correction is reset
manually by a
serviceman.
manually by a
serviceman.
A change in
photo
sensitivity of
photoconducto
r caused by
changes in the
ambient
temperature
(An increase
in bright
potential due
to degraded
photo
sensitivity
(response
speed) in low
temperature
environment)
photo
sensitivity of
photoconducto
r caused by
changes in the
ambient
temperature
(An increase
in bright
potential due
to degraded
photo
sensitivity
(response
speed) in low
temperature
environment)
To correct a change in photo
sensitivity of photoconductor
caused by changes in ambient
temperatures, maintaining the
proper density of print
(preventing against a fall in the
print density)
sensitivity of photoconductor
caused by changes in ambient
temperatures, maintaining the
proper density of print
(preventing against a fall in the
print density)
Laser beam power
(LD2)/
When the fusing
temperature is 80 C or
below after turning on
the power, the
correction quantity is
calculated for the
temperature in the
machine. When the
fusing temperature is
80 C or above after
turning on the power
and the temperature in
the machine is 30C or
below, the correction
quantity is not revised
and the previous
correction data are
used. If the
temperature in the
machine exceeds 30
C, the correction
quantity is reset.
(LD2)/
When the fusing
temperature is 80 C or
below after turning on
the power, the
correction quantity is
calculated for the
temperature in the
machine. When the
fusing temperature is
80 C or above after
turning on the power
and the temperature in
the machine is 30C or
below, the correction
quantity is not revised
and the previous
correction data are
used. If the
temperature in the
machine exceeds 30
C, the correction
quantity is reset.
Machine
temperature
sensor
temperature
sensor
When the
temperature in the
machine exceeds 30
C, the correction
quantity is reset to 0.
temperature in the
machine exceeds 30
C, the correction
quantity is reset to 0.
Main
charger grid
voltage
correction
charger grid
voltage
correction
A decrease in
dark potential
caused by
photoconducto
r membrane
decrease and
electrical and
optical stress
dark potential
caused by
photoconducto
r membrane
decrease and
electrical and
optical stress
To correct a decrease in dark
potential caused by
photoconductor membrane
decrease and electrical and
optical stress, maintaining the
dark potential on the
photoconductor surface at a
constant level. (Prevention
against background copy)
potential caused by
photoconductor membrane
decrease and electrical and
optical stress, maintaining the
dark potential on the
photoconductor surface at a
constant level. (Prevention
against background copy)
Main charger grid
voltage (Vg1)
voltage (Vg1)
Photoconductor
rotation time
(timer)
rotation time
(timer)
CRU model
Correction is reset
when the IC chip in
the toner hopper is
replaced at toner
replacement. In the
DM series, toner and
the photoconductor
drum cartridge are
replaced together.
SRU model
when the IC chip in
the toner hopper is
replaced at toner
replacement. In the
DM series, toner and
the photoconductor
drum cartridge are
replaced together.
SRU model
Correction is reset
manually by a
serviceman.
manually by a
serviceman.
An increase in
photoconducto
r dark potential
caused by a
change in
ambient
temperature
(high
temperature
environment)
photoconducto
r dark potential
caused by a
change in
ambient
temperature
(high
temperature
environment)
To correct a decrease in
photoconductor dark potential
caused by a change in ambient
temperature, maintaining the
dark potential on the
photoconductor surface at a
constant level. (Prevention
against background copy)
photoconductor dark potential
caused by a change in ambient
temperature, maintaining the
dark potential on the
photoconductor surface at a
constant level. (Prevention
against background copy)
Main charger grid
voltage (Vg2)/
When the fusing
temperature is 80C or
below after turning on
the power, the
correction quantity is
calculated for the
temperature in the
machine.
voltage (Vg2)/
When the fusing
temperature is 80C or
below after turning on
the power, the
correction quantity is
calculated for the
temperature in the
machine.
Machine
temperature
sensor
temperature
sensor
& !"#$
AR-350/450 BASIC PROCESS SECTION 5-4
ACTUAL LD POWER(mw) = LD1 +LD2
ACTUAL MC GRID VOLTAGE(v) = -650 + Vg1 + Vg2
ACTUAL DV BIAS VOLTAGE(v) = ACTUAL MC GRID VOLTAGE -(-150)
1
Photoconductor
characteristics
correction
characteristics
correction
Developing
bias voltage
correction
bias voltage
correction
Rising
characteristics
of
photoconducto
r potential
characteristics
of
photoconducto
r potential
When the main charger has not
been turned on and the
photoconductor surface
potential has been decreased,
if the main charger is turned on,
the photoconductor surface
potential will not reach the
specified level because of the
rising characteristics of the
photoconductor surface
potential. In this case, in order
to keep the voltage difference
between the photoconductor
surface potential rising and the
developing bias voltage at a
constant level, the developing
bias voltage rising is adjusted
to be the same as the
photoconductor surface
potential rising characteristics.
been turned on and the
photoconductor surface
potential has been decreased,
if the main charger is turned on,
the photoconductor surface
potential will not reach the
specified level because of the
rising characteristics of the
photoconductor surface
potential. In this case, in order
to keep the voltage difference
between the photoconductor
surface potential rising and the
developing bias voltage at a
constant level, the developing
bias voltage rising is adjusted
to be the same as the
photoconductor surface
potential rising characteristics.
Developing bias
voltage rising
voltage rising
Photoconductor
rotation time
(timer)
(Stationary
time)
rotation time
(timer)
(Stationary
time)
Photoconductor
dark potential/
developer
characteristics
correction
dark potential/
developer
characteristics
correction
Developing
bias voltage
correction
bias voltage
correction
A decrease in
the OPC drum
dark potential
caused by the
transfer
current and a
decrease in
the developer
charging
capability
caused by
deterioration
of developer
the OPC drum
dark potential
caused by the
transfer
current and a
decrease in
the developer
charging
capability
caused by
deterioration
of developer
To prevent against dirt on the
transfer roller and the transfer
paper guide caused by a
decrease in the photoconductor
drum dark potential and a
decrease in the developer
changing capacity. (Prevention
against background copy)
transfer roller and the transfer
paper guide caused by a
decrease in the photoconductor
drum dark potential and a
decrease in the developer
changing capacity. (Prevention
against background copy)
Developing bias
voltage
voltage
Developing
roller rotation
time (Timer)
roller rotation
time (Timer)
CRU model
Correction is reset
when the fuse is
blown off at
replacement of the
developing unit.
SRU model
when the fuse is
blown off at
replacement of the
developing unit.
SRU model
Correction is reset
when the toner
concentration setup
diag is executed.
when the toner
concentration setup
diag is executed.
2
Developing
capacity change
correction
capacity change
correction
Toner
concentratio
n correction
concentratio
n correction
A change in
developing
capacity due
to aging of
developer
(Changes in
developer and
toner
characteristics
(charging
capacity)) and
a detection
error of the
toner
concentration
sensor
developing
capacity due
to aging of
developer
(Changes in
developer and
toner
characteristics
(charging
capacity)) and
a detection
error of the
toner
concentration
sensor
To maintain the normal toner
concentration for changes in
developing capacity due to
aging of developer (a change in
developer and toner
characteristics (charging
capacity)) and a detection error
of the toner concentration
sensor (Maintaining the proper
print density and prevention
against background copy and
toner dispersion caused by
overtoner)
concentration for changes in
developing capacity due to
aging of developer (a change in
developer and toner
characteristics (charging
capacity)) and a detection error
of the toner concentration
sensor (Maintaining the proper
print density and prevention
against background copy and
toner dispersion caused by
overtoner)
Toner concentration
control reference level
(data)
control reference level
(data)
Developing
roller rotation
time (Timer)
roller rotation
time (Timer)
CRU model
Correction is reset
when the fuse is
blown off at
replacement of the
developing unit.
SRU model
when the fuse is
blown off at
replacement of the
developing unit.
SRU model
Correction is reset
when the toner
concentration setup
diag is executed.
when the toner
concentration setup
diag is executed.
Toner
concentration
sensor
detection error
caused by a
change in the
ambient
temperature
(by a change
in developer
and toner
characteristics
(charging
capacity))
concentration
sensor
detection error
caused by a
change in the
ambient
temperature
(by a change
in developer
and toner
characteristics
(charging
capacity))
To maintain the normal toner
concentration for the toner
concentration sensor detection
error caused by a change in the
ambient temperature and to
maintain the normal toner
concentration, and to prevent
against background copy and
toner dispersion
concentration for the toner
concentration sensor detection
error caused by a change in the
ambient temperature and to
maintain the normal toner
concentration, and to prevent
against background copy and
toner dispersion
Machine
temperature
sensor
temperature
sensor
Item
No.
Correction items
Factor
Purpose/Effect
Changed item
Correction base
factor
Correction reset
conditions
' !"#$
AR-350/450 BASIC PROCESS SECTION 5-5
B. Process correction check and setup
The process correction setup status check described above and the
correction setup can be performed with SIM 44-1.
The operation status can be set with the bit value below (converted value
from binary to decimal). (Normally all the corrections are operated, and
from binary to decimal). (Normally all the corrections are operated, and
the setup value is 511.)
SIM setup menu
In addition, the correction status of each data can be checked with SIM
44-9.
44-9.
DRUM ROTATION TIME: Drum rotation time
*1 This value is the detected value when PTH is set to 0 by SIM 44-4. If
it is set to other than 0, the set value by SIM 44-4 is displayed.)
C. Details of process correction
(1) LASER POWER CORRECTION FOR OPC DRUM
ROTATION TIME
The laser output value is corrected in order to provide proper density
prints by maintaining the bright potential at a constant level by correcting
prints by maintaining the bright potential at a constant level by correcting
a decrease in the optical sensitivity caused by OPC drum membrane
decrease and optical stress.
(2) LD POWER CORRECTION FOR TEMPERATURE
This correction is made with the correction value for the temperature
value according to the drum rotation time. A change in the optical
sensitivity of the OPC drum for a change in the temperature is corrected
to maintain the proper print density.
to maintain the proper print density.
Vg1
Grid voltage correction value by the drum rotation time
Vg2
Grid voltage correction value by the temperature inside
the machine
the machine
Vb1-1
Vb correction value (First rotation)
Vb1-2
Vb correction value (Second rotation)
Vb2
Developing bias correction value
LD1
Laser power correction value by the drum rotation time
LD2
Laser power correction value by the temperature inside
the machine
the machine
CONTROL
CRUM control specification (1 - 3)
DESTINATION CRUM destination (A - J)
PTH
PTH
*1
Process thermister temperature value
T0
Toner control correction value (rotation time correction)
±100)
±100)
T1
Toner control correction value T1 (temperature
correction) ±100)
correction) ±100)
T2
Toner control correction value T2 (temperature
correction) ±100)
correction) ±100)
0
15
0
14
0
13
0
12
0
11
0
10
0
Vb4 Vb3
9
8
7
LD2
6
LD1
5
Vb2
4
Vb1
3
Vg3
2
Vg2
1
Vg1
0
Bit
SIMULATION 44-1
PROCESS CORRECTION VALUE SETTING. INPUT VALUE 0-511
AND PRESS START.
BIT0:Vg1, BIT1:Vg2, BIT2:Vg3, BIT3:Vb1
BIT4:Vb2, BIT5:LD1, BIT6:LD2, BIT7:Vb3
BIT8:Vb4
PROCESS CORRECTION VALUE SETTING. INPUT VALUE 0-511
AND PRESS START.
BIT0:Vg1, BIT1:Vg2, BIT2:Vg3, BIT3:Vb1
BIT4:Vb2, BIT5:LD1, BIT6:LD2, BIT7:Vb3
BIT8:Vb4
511
SIMULATION 44-9
PROCESS CONTROL DATA DISPLAY.
DRUM ROTATION TIME:
PROCESS CONTROL DATA DISPLAY.
DRUM ROTATION TIME:
01234567
(sec)
Vg1:
30
(V)
Vg2:
30
(V)
Vb1-1:
30
(V) Vb1-2:
30
(V) Vb2:
10
(V)
LD1:
0.05
(mW)
LD2:
0.05
(mW)
CONTROL:
1
DESTINATION:
A
PTH:
30
(deg)
TO:
-5
T1:
-5
T2:
-3
LD POWER CORRECTION
45PPM LD POWER
35PPM LD POWER
Correction limit
(35/45PPMmodel common)
(35/45PPMmodel common)
Base level for
45PPM model
45PPM model
Base level for
35PPM model
35PPM model
LD POWER CORRECTION
Temperature( )
Correction value of laser power(mW)
table1
table2
table3
table4
table2
table3
table4
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