Sharp AR-C150 (serv.man5) Service Manual ▷ View online
No.
Parts
Note
Code
Signal
name
Name
Type
Function/Operation
Active
condition
17
Lower heat roller
Heats toner on the paper to fuse
it onto the paper.
it onto the paper.
18
BPD
BPD
Fusing paper entry
detector
detector
Photo sensor (Photo
transmission)
transmission)
Detects paper entry in the fusing
section.
section.
L when paper
entry in the
fusing section
entry in the
fusing section
19
THS2
THS2
Fusing main
temperature sensor
(lower)
temperature sensor
(lower)
Thermistor
Detects the heat roller surface
temperature.
temperature.
Analog input
20
THS4
THS4
Fusing sub
temperature sensor
(lower)
temperature sensor
(lower)
Thermistor
Detects the heat roller surface
temperature.
temperature.
Analog input
When a temperature
difference from the
fusing main
temperature sensor
(lower) is detected, it
is judged that paper
is wrapped around
the fusing roller.
difference from the
fusing main
temperature sensor
(lower) is detected, it
is judged that paper
is wrapped around
the fusing roller.
21
FOP
FOP
Oil pump
Sends oil to the oil roller.
22
Oil tank
Stores oil.
23
OEMP
OEMP
Oil sensor
Photo sensor (Photo
refraction)
refraction)
Detects oil empty.
H when empty
24
HLTSD
HLTSD
Thermostat (lower)
Cuts conduction to the heater
lamp when the temperature rises
abnormally.
lamp when the temperature rises
abnormally.
25
Fusing transport
roller
roller
Transports paper to the paper
exit roller.
exit roller.
26
Idle roller
Applies a pressure to the paper
and the transport roller to give
the transport roller power to the
paper.
and the transport roller to give
the transport roller power to the
paper.
(Paper exit unit)
No.
Parts
Note
Code
Signal
name
Name
Type
Function/Operation
Active
condition
1
Paper exit unit
Discharges the fused paper outside the
machine.
machine.
2
POD
POD
Paper exit detector
Photo sensor (Photo
transmission)
transmission)
Detects paper exit.
L with paper
presence
presence
3
Paper exit roller
Discharges paper outside the machine.
4
Idle roller
Applies a pressure to the paper and the
paper exit roller to give the paper exit
roller power to the paper.
paper exit roller to give the paper exit
roller power to the paper.
2
1
3
4
4
AR-C150
2 – 35
C. Details of operation
(1) Fusing
Each color toner of Y/M/C/K on the paper is fused by heat and pres-
sure from the heat roller. At that time, color toners of Y/M/C/K are
mixed to reproduce the original image colors virtually.
sure from the heat roller. At that time, color toners of Y/M/C/K are
mixed to reproduce the original image colors virtually.
There are two heater lamps, one in the upper heat roller, the other in
the lower heat roller, heating the paper from the upper and the lower
sides.
the lower heat roller, heating the paper from the upper and the lower
sides.
This is because heating from the both sides is necessary to fuse the
toner of four layers on the paper.
toner of four layers on the paper.
The upper and the lower heat rollers are made of silicon rubber.
This is because of the following reasons.
1) Separation is made downward. (Since the hardness of the lower
roller is slightly higher than that of the upper roller, the paper goes
downward. )
downward. )
2) The nip quantity is increased to increase heating capacity for the
paper.
3) By pressing the flexible roller, multi-layer toner is fused without de-
formation. (However, flatness is not so high.)
4) An even pressure is applied to the concavo-convex surface of
toner (due to multi-layer structure).
(2) Oil supply and recycle
Fusing oil is used to improve fusing capability and separation capabil-
ity after fusing. This oil is transported from the oil tank to the oil roller
by the oil pump.
ity after fusing. This oil is transported from the oil tank to the oil roller
by the oil pump.
The oil felt attaches oil to the oil roller, which supplies oil to the upper
heat roller.
heat roller.
As a result, a think film of oil is formed on the heat roller surface.
Oil quantity no the oil roller is controlled to be constant by the oil
blade.
blade.
Oil which is not used in the fusing section is passed through the oil
tray and the filter to the oil tank for reuse.
tray and the filter to the oil tank for reuse.
The oil tank is provided with the oil sensor which detects remaining
quantity of oil in the tank. When the oil remaining quantity falls below
the specified level, printing is inhibited.
quantity of oil in the tank. When the oil remaining quantity falls below
the specified level, printing is inhibited.
Oil pumping is performed during warm-up and while the paper is
passing through the fusing section.
passing through the fusing section.
Blade
Oil apply roller
Oil felt
valve
Oil tray
Pump
Heat roller
Hearter lamp
Filter
Oil tank
Heat roller
Heat roller
AR-C150
2 – 36
(3) Fusing temperature control
The temperature sensors are provided at the center and the ends of
the upper and the lower heat rollers. The heat roller temperature is
detected by the temperature sensor at the center to control the heater
lamp so that the constant fusing temperature is provided.
the upper and the lower heat rollers. The heat roller temperature is
detected by the temperature sensor at the center to control the heater
lamp so that the constant fusing temperature is provided.
The fusing temperature is varied depending on the kind of paper.
Upper heat roller
Lower heat
roller
Ready
condition
condition
177°C
132°C
Power save
mode
mode
137°C
OFF
Print mode
Normal paper
170°C
125°C
OHP sheet
180°C
175°C,
Thick paper
180°C
195°C,
(4) Winding jam detection
The temperature sensors at the ends of the heat rollers detect a wind-
ing jam when paper winds around the fusing roller.
ing jam when paper winds around the fusing roller.
When paper winds around the fusing roller, it is squeezed between
the temperature sensor at the center and the heat roller, reducing the
detection temperature of the temperature sensor.
the temperature sensor at the center and the heat roller, reducing the
detection temperature of the temperature sensor.
While there is no paper around the temperature sensor at the ends,
there is no change in detection temperature.
there is no change in detection temperature.
As a result, a difference is generated in the detection temperatures at
the center and at the ends. This state is detected as a winding error
and the error code is displayed.
the center and at the ends. This state is detected as a winding error
and the error code is displayed.
(5) Separation
When paper is not separated naturally after fusing, it is mechanically
separated from the heat roller by the separation pawl.
(The separation pawl is provided only in the AR-C150.)
separated from the heat roller by the separation pawl.
(The separation pawl is provided only in the AR-C150.)
(6) Operations in the duplex mode (AR-C150 only)
In the duplex mode, the duplex gate is turned ON and the paper after
fusing is transported to the duplex section.
fusing is transported to the duplex section.
(7) After fusing, the paper is discharged outside the
machine by the paper exit roller.
(8) Others
∗
The fusing and the paper exit sections are driven by the fusing
motor.
motor.
∗
The fusing and the paper exit sections are controlled by the fusing
control PWB (AC SUB power PWB) and the PCU SUB PWB.
control PWB (AC SUB power PWB) and the PCU SUB PWB.
AR-C150
2 – 37
[3] IMAGE FORMING SECTION CORRECTION (PROCESS CORRECTION)
1. Outline and purpose
Correction of the image forming section is performed to maintain stable and high quality print even though there are some changes in the tempera-
ture, the humidity, the characteristics of consumable parts, and the operating conditions of the engine.
In concrete, correction is performed by changing the control parameters related to the image forming section (process) and the image process opera-
tions.
The above correction operation prevents against deterioration in the print qualities on color balance, gradation, background copy (dirty background),
due to changes in operating conditions.
It also reduces the necessity of servicing, reducing the number of service calls.
ture, the humidity, the characteristics of consumable parts, and the operating conditions of the engine.
In concrete, correction is performed by changing the control parameters related to the image forming section (process) and the image process opera-
tions.
The above correction operation prevents against deterioration in the print qualities on color balance, gradation, background copy (dirty background),
due to changes in operating conditions.
It also reduces the necessity of servicing, reducing the number of service calls.
2. Image forming section correction items list
There are following correction items.
A. List
Item
NO.
Correction items
Factors
Purpose and effect
Change item
NOTE
1
Image density
sensor sensitivity
correction
(Calibration)
(Gain
adjustment)
sensor sensitivity
correction
(Calibration)
(Gain
adjustment)
Sensitivity change due
to dirt on the sensor
and temperature
change
to dirt on the sensor
and temperature
change
Sensitivity change due to image
density sensor dirt or
temperature change is
corrected to assure correct
image patch density detection.
density sensor dirt or
temperature change is
corrected to assure correct
image patch density detection.
LED drive
current (voltage)
for the sensor
current (voltage)
for the sensor
2
OPC drum
marking sensor
sensitivity
adjustment
(Calibration)
(Gain
adjustment)
marking sensor
sensitivity
adjustment
(Calibration)
(Gain
adjustment)
Sensitivity change due
to dirt on the sensor
and temperature
change
to dirt on the sensor
and temperature
change
Sensitivity change due to OPC
drum marking sensor dirt and
temperature change is
corrected to assure correct
recognition of the OPC drum
type and control of the image
forming position (phase).
drum marking sensor dirt and
temperature change is
corrected to assure correct
recognition of the OPC drum
type and control of the image
forming position (phase).
LED drive
current (voltage)
for the sensor
current (voltage)
for the sensor
3
OPC drum
deterioration
correction
deterioration
correction
Laser beam
power correction
power correction
Photo sensitivity
decrease due to OPC
drum membrane
decrease and electrical
stress and photo stress
decrease due to OPC
drum membrane
decrease and electrical
stress and photo stress
Photo sensitivity decrease due
to OPC drum membrane
decrease and electrical and
photo stress is corrected to
maintain the proper print density
and prevent against
background copy.
to OPC drum membrane
decrease and electrical and
photo stress is corrected to
maintain the proper print density
and prevent against
background copy.
Laser beam
power
power
Reset by SIM 24-7.
4
High density
(saturation
density) image
correction
(saturation
density) image
correction
Developing bias
voltage
correction
voltage
correction
"OPC drum/developing
section
(developer/toner)
characteristics change
(Temperature/humidity
change,
developer/toner
deterioration)"
section
(developer/toner)
characteristics change
(Temperature/humidity
change,
developer/toner
deterioration)"
Density change and
background copy due to the
image forming section
characteristics change are
prevented. (High density section
is corrected.)
background copy due to the
image forming section
characteristics change are
prevented. (High density section
is corrected.)
Developing bias
voltage
voltage
The factors of the
developing section
characteristics change
include the effects of
temperature and
humidity as well as
developer deterioration.
developing section
characteristics change
include the effects of
temperature and
humidity as well as
developer deterioration.
Main charger
grid voltage
correction
grid voltage
correction
Developing bias
voltage change due to
developing bias voltage
correction (change)
voltage change due to
developing bias voltage
correction (change)
Correction for correction
(change) of the developing bias
voltage. It is performed in order
to maintain the constant
difference between the
developing bias voltage and the
main charger grid voltage.
(Prevention against background
copy)
(change) of the developing bias
voltage. It is performed in order
to maintain the constant
difference between the
developing bias voltage and the
main charger grid voltage.
(Prevention against background
copy)
Main charger
grid voltage
grid voltage
If the difference
between the
developing bias voltage
and the main charger
grid voltage is not
maintained at constant
level, improper density,
background copy, or
carrier drop may be
resulted.
between the
developing bias voltage
and the main charger
grid voltage is not
maintained at constant
level, improper density,
background copy, or
carrier drop may be
resulted.
5
Transfer
capability
correction
capability
correction
Transfer voltage
correction
correction
Transfer belt
characteristics change
(temperature/humidity
change)
characteristics change
(temperature/humidity
change)
Influence on the change in
transfer capability (transfer
conditions) is reduced to assure
stable transfer operation.
transfer capability (transfer
conditions) is reduced to assure
stable transfer operation.
Transfer voltage
"Paper kind (thickness,
material)"
material)"
Correction for change in
transfer efficiency due to paper
kind
transfer efficiency due to paper
kind
Transfer voltage
Back print
Correction for change in
transfer efficiency due to
change in paper surface
conditions
transfer efficiency due to
change in paper surface
conditions
Transfer voltage
AR-C150
3 – 1
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