Sharp AR-C262M (serv.man3) Service Manual ▷ View online
AR-C262M EXTERNAL VIEW AND INTERNAL STRUCTURE 6 - 12
(3) Sensors
(4) Cross-section diagram
No.
Name
Code
Type
Function/operation
Output
1
Tray original length sensor 2 DLS2
Photo interrupter Detects length of original in tray (long originals) TP3 becomes HIGH when original is detected.
2
Tray original length sensor 1 DLS1
Photo interrupter Detects length of original in tray (short originals) TP2 becomes HIGH when original is detected.
3
Original width detector
volume
volume
DWVR Volume
Detects width of original in tray
TP1 voltage changes within range of 0 to 5V
depending on width of original.
depending on width of original.
4
ADF front open sensor
FOS
Photo interrupter ADF open/closed status sensor
TP18 becomes HIGH when ADF is open.
5
Empty sensor
EMPS Photo interrupter Detects the presence of an original in document
feed tray
TP5 becomes LOW when an original is
detected.
detected.
6
Timing sensor
TIMS
Reflection sensor Detects when the original has been transported
as far as the timing sensor section
TP11 becomes 1V or lower when an original
is detected.
is detected.
7
Resist sensor
REGS Reflection sensor Detects when the original has been transported
as far as the resist sensor section
TP8 becomes 1V or lower when an original is
detected.
detected.
8
Document feed open sensor DFOS
Photo interrupter Detects the open/closed status of document
feed cover
TP4 becomes HIGH when the cover is open.
9
Document feed open switch DFSW Microswitch
Detects the open/closed status of document
feed cover
feed cover
Pin 2 on CN11 becomes 24V when the cover
is open (when ADF is closed).
is open (when ADF is closed).
10
Document exit open sensor
DEOS Photo interrupter Detects the open/closed status of the document
exit cover
TP17 becomes HIGH when the cover is open.
11
ADF open switch
AOSW Microswitch
Detects the open/closed status of the ADF
TP47 becomes HIGH when the cover is open.
12
Reverse sensor
DRS
Reflection sensor Detects when the original has been transported
as far as the reverse sensor section
TP14 becomes 1V or lower when the original
is detected.
is detected.
13
Document exit sensor
DES
Photo interrupter Detects when the original has been transported
as far as the document exit sensor section
TP16 becomes HIGH when an original is
detected.
detected.
No.
Name
Function/operation
1
Pickup roller
Picks up the document.
2
Document feed roller
Presses document onto the separation pad to feed.
3
Separation pad
Separates document.
4
Resist roller
Corrects paper skew and transports document.
5
Idle roller
The follower roller which is pressed onto the resist roller.
6
Belt roller L
Drive roller of DF belt.
7
Idle roller
Presses DF belt onto the platen glass.
8
DF belt
Transports document on the platen glass.
9
Idle roller
Presses DF belt onto the platen glass.
10
Belt roller R
The follower roller which is pressed onto the resist roller.
11
Reverse roller
Reverses document or discharges document.
4
9
5
7
8
6
11
10
12
13
1
2
3
1
2
3
4
5
6
7
8
9
10
11
AR-C262M DESCRIPTIONS OF EACH SECTION 7 - 1
[7] DESCRIPTIONS OF EACH SECTION
1. Fusing section
A. Operational descriptions
(1) Outline
This section performs the following function and operation.
1) Toner attached to paper in the transport section is fused onto
paper by heat and pressure of the heat roller.
(2) Electrical section
GND2
GND2
THSU
THSD
POD1
+5V
FULHin
+24VL
PCU
FUSM
Driver PWB
Fusing drive connection gear
Drawer connector (13+4pin)
DC power PWB
HL drive circuit
L2
HL1N
2
B2
B3
B4
B6
B1
B3
B4
B5
A7
A6
A2
A1
A4
A4
A5
A3
L2
CN3-3
N2
CN3-1
1
3
2
1
3
HL2N
+24V
+24V
+5V
GND2
THSU
THSD
POD1
FUCHin
GND2
+24V
+24V
+24V
FUSM_A
FUSM_B
FUSM_A\
FUSM_B\
+24V
HLPR
HL1
HL1N
HL2N
L2
HL2
MSW
ON
DC-CNT
FUSM_A\
FUSM_B\
FUSM_A
DSWL
DSWL
FUSM_B
+24V
+24V
FUSM_A\
FUSM_B\
FUSM_A
DSWL
FUSM_B
DSWLin
DSWLout
CN3
CN1(6pin)
CN8(20pin)
CN14(10pin)
CN2(34pin)
CN12(34pin)
CN7
CN2
7
6
5
4
3
1
6
5
4
3
2
1
1
1
1
8
9
10
10
8
19 20
12
14
7
6
6
2
2
8
6
4
3
3
9
11
16
7
5
3
1
9
11
16
7
5
3
2
1
POD1
THSU
THSD
THSD
HLTS1
HL1
HL2
HLTS2
HLTS2
3
5
4
3
2
1
2
1
2
1
1
Fusing unit
AR-C262M DESCRIPTIONS OF EACH SECTION 7 - 2
(3) Major parts/signals functions and operations
RW: Abbreviation of Related Wiring, which means the said load is specified in the related figure of the mechanical and the electrical sections.
(4) Operational descriptions
a. Fusing unit drive
To drive the fusing unit, drive power is transmitted from the drive
motor (FUSM) through the connection gear to the upper heat roller
gear.
motor (FUSM) through the connection gear to the upper heat roller
gear.
The drive motor (stepping motor) is driven by the motor drive IC in
the driver PWB according to the control signal sent from the PCU.
the driver PWB according to the control signal sent from the PCU.
b. Heater lamp drive
The surface temperature detected by the thermistor is sent to the
PCU. When the temperature is lower than the specified level, the
PCU sends the heater lamp lighting signal to the heater lamp drive
circuit in the DC power PWB.
PCU. When the temperature is lower than the specified level, the
PCU sends the heater lamp lighting signal to the heater lamp drive
circuit in the DC power PWB.
The triac in the heater lamp drive circuit is turned on to apply AC
power to the heater lamp, which turns on to heat the heat rollers.
power to the heater lamp, which turns on to heat the heat rollers.
The thermostats are provided as a safety measure to prevent
against an abnormally high temperature of the heat rollers.
against an abnormally high temperature of the heat rollers.
When the thermostat is opened, the power supply (AC neutral) to
the heater lamp is cut off.
the heater lamp is cut off.
c. Fusing operation
Color toner of YMCK on paper is heated and pressed by the heat
rollers to be fused on paper.
rollers to be fused on paper.
At that time, color toner of YMCK is mixed to reproduce nearly
actual colors of document images.
actual colors of document images.
The upper and the lower heat rollers are provided to heat from
above and below. This is because it is necessary to heat four lay-
ers of toner from above and below and right and left to fuse it on
paper.
above and below. This is because it is necessary to heat four lay-
ers of toner from above and below and right and left to fuse it on
paper.
The upper and lower heat rollers are of silicon rubber. This is
because of the following reasons:
because of the following reasons:
1) To provide a greater nip quantity and a higher heating capacity
for paper.
2) The soft, flexible rollers press multi-layer toner without defor-
mation to fuse on paper.
3) An even pressure is applied to an uneven surface of multi-
layer toner.
6
1
6
2
4
1
5
3
4
1
2
2
6
3
6
6
1
2
4
5
4
5
1
1
3
120V 950W
120V 350W
120V 350W
No.
Name
Code, Signal name
Function
1
Heat roller
—
Heats and presses toner to fuse it on paper. Silicon rubber rollers are used as the
upper and the lower heat rollers. Teflon tube is wound around the upper heat roller.
upper and the lower heat rollers. Teflon tube is wound around the upper heat roller.
2
Upper/lower
separation pawls
separation pawls
—
Mechanically separate paper from the heat roller, which was not separated
naturally.
naturally.
3
Heater lamp
Upper: HL1, Lower: HL2
Heats the heat rollers.
4
Thermistor
Upper: THSU,
Lower: THSD
Lower: THSD
Detects the surface temperature of the heat roller. (Keeps the roller surface
temperature at a constant level.)
temperature at a constant level.)
5
Thermostat
Upper: HLTS1,
Lower: HLTS2
Lower: HLTS2
Cuts conduction of the heater lamp when an abnormally high temperature is
detected.
detected.
6
Paper exit sensor
POD1
Detects paper discharged from the fusing section.
RW
Control signal
FUSM_A, A’, B, B’
Drives the fusing section.
RW
Control signal
FUCHin
Fusing unit installation detecting signal
RW
Control signal
DSWL
Left cabinet open/close detection signal
RW
Control signal
HLPR
Heater lamp power relay (in the DC power PWB) drive signal
FUSM
PCU
Driver
PWB
PWB
AR-C262M DESCRIPTIONS OF EACH SECTION 7 - 3
d. Fusing temperature control
The temperature sensor is provided at the center of the upper and
the lower heat rollers.
the lower heat rollers.
The temperature sensor at the center detects the heat roller tem-
perature and controls the heater lamp to keep the fusing tempera-
ture at the specified level.
perature and controls the heater lamp to keep the fusing tempera-
ture at the specified level.
The fusing temperature is switched according to the machine con-
dition and paper type selected.
dition and paper type selected.
B. Disassembly/Assembly/Maintenance
(1) Fusing section maintenance target parts
✕
: Check (Clean, replace, or adjust as necessary.)
❍
: Clean
▲
: Replace
∆
: Adjust
✩
: Lubricate
❏
: Shift position
Upper heat roller
Lower heat roller
Ready state
170°C
120°C
Power save mode
143°C
OFF
Print mode
Normal paper
175°C
140°C
OHP sheet
170°C
155°C
Heavy paper 1
175°C
136°C
Heavy paper 2
175°C
145°C
Envelope
180°C
145°C
Unit Name
No.
Part name
When
calling
50K 100K 150K 200K 250K 300K 350K 400K
Remark
Fusing section
1
Upper heat roller
✕
✕
▲
✕
▲
✕
▲
✕
▲
Replace at 100K or
within 2 years.
within 2 years.
2
Lower heat roller
✕
✕
▲
✕
▲
✕
▲
✕
▲
Replace at 100K or
within 2 years.
within 2 years.
3
Heat roller gear
✕
✕
▲
✕
▲
✕
▲
✕
▲
100K
4
Heat roller bearing
✕
✕
▲
✕
▲
✕
▲
✕
▲
100K
5
Separation pawl
✕
✕
▲
✕
▲
✕
▲
✕
▲
100K
6
Thermistor
✕
✕
▲
✕
▲
✕
▲
✕
▲
100K
–
Bearings
✕
✕
✕
✕
✕
✕
✕
✕
✕
8
Gears
✕
✩
✩
✩
✩
✩
✩
✩
✩
9
Paper guides
❍
❍
❍
❍
❍
❍
❍
❍
❍
10 Paper exit roller
✕
✕
✕
✕
✕
✕
✕
✕
✕
11 Paper exit roller
✕
✕
✕
✕
✕
✕
✕
✕
✕
12 Discharge brush
✕
✕
✕
✕
✕
✕
✕
✕
✕
–
Fusing unit
✕
▲
✕
▲
✕
▲
✕
▲
Replace the unit at
100K or within 2 years.
100K or within 2 years.
6
6
1
2
4
4
4
4
5
8
9
3
6
6
1
2
5
4
4
4
4
5
10
8
9
3
11
11
11
11
12
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