Sharp AR-P350 / AR-P450 (serv.man6) Service Manual ▷ View online
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
!"#$
AR-350/450 BASIC PROCESS SECTION 5-6
(3) MAIN CHARGER GRID VOLTAGE CORRECTION FOR
OPC DRUM ROTATION TIME
A decrease in the dark potential caused by OPC drum membrane
decrease and electrical and optical stresses is corrected to maintain the
dark potential on the OPC drum surface at a constant level. (Prevention
dark potential on the OPC drum surface at a constant level. (Prevention
against background copy)
(4) MC GRID VOLTAGE CORRECTION FOR TEMPERATURE
This correction is performed with the correction value of the temperature
value according to the drum rotation time. A decrease in the dark
potential of the OPC drum according to the temperature is corrected to
maintain the dark potential on the OPC drum surface. (Prevention
maintain the dark potential on the OPC drum surface. (Prevention
against background copy)
(5) RISE TIME CORRECTION FOR OPC DRUM POTENTIAL
When the main charger is kept OFF for a long time and the OPC drum
surface potential decreases, though the main charger is turned ON, the
OPC drum surface potential does not rise up to the specified level soon
OPC drum surface potential does not rise up to the specified level soon
because of the rise time characteristics of the OPC drum surface
potential.
In this case, the developing bias voltage rise time is adjusted to the OPC
In this case, the developing bias voltage rise time is adjusted to the OPC
drum surface potential rise characteristics in order to maintain the OPC
drum surface potential rise and the developing bias voltage at a constant
level.
level.
(6) DV BIAS CORRECTION
This is performed in odder to prevent against dirt on the transfer roller
and the transfer paper guide caused by a decrease in the OPC drum
dark potential and a decrease in the developer charging capacity.
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
OPC DRUM ROTATION TIME
MAIN CHARGER GRID
VOLTAGE CORRECTION VALUE(-V)
MAIN CHARGER GRID VOLTAGE CORRECTION FOR
OPC DRUM ROTATION TIME
45PPM
35PPM
MC GRID VOLTAGE CORRECTION FOR TEMPERATURE
MC Grid correction voltage
TEMPERATURE( )
0v
-650v
-500v
0v
-650v
0v
MC grid
voltage
voltage
OPC drum
surface potential
surface potential
DV bias voltage
-485v
-450v
450v
DV BIAS CORRECTION
DV roller rotation time(sec)
DV Bias correction voltage
1
2
3
2
3
( !"#$
AR-350/450 BASIC PROCESS SECTION 5-7
(7) TONER CONCENTRATION CORRECTION
The toner concentration control reference level (data) is corrected to
maintain the proper toner concentration for a change in developing
capacity (a change in developer and toner characteristics (charging))
capacity (a change in developer and toner characteristics (charging))
caused by aging of developer and an error in the toner concentration
sensor.
(Maintenance of proper concentration print and prevention against
(Maintenance of proper concentration print and prevention against
background copy caused by over-toner and toner dispersion)
(8) TRANSFER ROLLER CLEANING
The developing positive bias is applied to the OPC drum at the timing
shown below so that remaining toner on the transfer roller is attracted
again to the OPC drum, performing cleaning.
again to the OPC drum, performing cleaning.
1) When the power is turned on:
* No cleaning during the warm up after canceled diagnostic
* However, the cleaning voltage is not applied during warm up after
completion of SIM.
2) After completion of a print job
3) After printing 100 pages (in one job)
<Reference>
OPC drum sensitivity
Changes in the temperature inside the machine and the OPC drum
Changes in the temperature inside the machine and the OPC drum
sensitivity
3. Toner recycle system
This machine employs the toner recycle system to cut the running costs.
The operations of the toner recycle system are as follows:
Toner recycle movie
1) Collects remaining toner (hereinafter referred to as waste toner) on
the OPC drum with the cleaner blade.
2) Waste toner is transported through the transport pipe.
3) Waste toner is mixed in the toner cartridge again.
4) When there is a large amount of toner in the cartridge, waste toner is
4) When there is a large amount of toner in the cartridge, waste toner is
simply mixed and stirred in the cartridge.
5) When there is a small amount of toner in the cartridge, the buffer
plate in the cartridge prevents waste toner from being mixed beyond
a certain ratio.
Note: If the ratio of waste toner becomes too great, images will be badly
affected as well as developer in the developing unit.
When near empty or empty is displayed, do not shake the toner
cartridge.
By the way, near empty and empty conditions are stored in the
By the way, near empty and empty conditions are stored in the
CRUM-IC in the toner cartridge.
4. Toner remaining quantity
A. Toner remaining quantity display
The toner remaining quantity display is calculated by the accumulated
rotating time of the toner motor (TM). Since, however, there is a
rotating time of the toner motor (TM). Since, however, there is a
considerable error in the accumulated rotating time of the toner motor,
the status displays of "Toner near end" and "Toner end" which are directly
related to replacement of consumable parts are detected by the toner
related to replacement of consumable parts are detected by the toner
quantity sensor.
"Toner near end" and "Toner end" statuses are stored in the CRUM-IC
and cannot be cleared.
and cannot be cleared.
* The toner supply time clear is set with SIM 24-11. This is not to clear
the counter accumulated in the toner cartridge (CRUM-IC) but to
clear the value read by the machine. It is used when the toner
clear the value read by the machine. It is used when the toner
remaining quantity display is erroneous.
B. Trouble code "F2-02" detection
When the toner supply time is 2,500 sec or less, if toner empty is
detected, "F2-02" is displayed to indicate a toner supply abnormality.
TONER CONCENTRATION CORRECTION
TEMPERATURE
CORRECTION LEVEL / TONER CONCENTRATION
CORRECTION RATE
CORRECTION LEVEL(COUNT VALUE)
TONER CONCENTARATION
CORRECTION RATE(%)
CORRECTION RATE(%)
CLEANING
READY CONDITION
WARMING UP
PRINTING
CLEANING
1sec
PRINTING(100Sheets)
CLEANING PRINTING(100Sheets)
CLEANING
1sec
1sec
Temperature
OPC drum sensitivity
High
Low
LCD
display
Remaining
quantity
information
Detection
Status
Remark
100 -
75%
75%
75% or
above
above
Toner motor
rotating time
rotating time
Normal
75 -
50%
50%
75% - 50%
Toner motor
rotating time
rotating time
Normal
50 -
25%
25%
50% - 25%
Toner motor
rotating time
rotating time
Normal
25 - 0%
25% - 5%
Toner motor
rotating time
rotating time
Normal
25 - 0%
About 50
sheets
remaining
sheets
remaining
Toner quantity
sensor
sensor
Toner near
end
end
A4 5% output
0%
0%
Toner quantity
sensor
sensor
Toner end
) !"#$
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