Parts marked with "!" is important for maintaining the safety of the set. Be sure to replace these parts with specified
ones for maintaining the safety and performance of the set.
This document has been published to be used
SHARP CORPORATION
for after sales service only.
The contents are subject to change without notice.
(1) Signal name and output voltage . . . . . . . . . . . . .12-13
II
[1] GENERAL DESCRIPTION
1. Features
[Small]
• Compact design
• Small area for operation
[Speedy]
• Warm-u p time 30 se c or less, the fi rst co py 5.9 sec ∼ the fastest in
the class.
• The automatic document feeder (standard provision in the SF-
2514 only) increases copy productivity.
2. Target users
Average copy volume of 2,000 ∼ 3,000 sheets/mon th (max. 10,000
sheets/month)
3. System outli ne
SPF (Standard)
Zooming range
SF-2514
(64 ~ 129%)
250-sheet tray
[Soft]
• The energy save mode reduces the total power consumption.
• Ozone generation is limited.
• Use of materials which can be recycled.
User simulation
The user can select the desired operating conditions easily. Auto
clear time, power save mode time, power save mode warm up time
can be set by the user simulation.
Single manual feed (Standard)
50-sheet multi manual feed unit (SF-MF14)
(Option)
50
(Opti on)
250-sheets paper f eed uni t
(SF-CM14)
250 sheets
250 sheets
No.2 tray unit
(Option)
250-sheets paper tray
(SF-UB14)
SF-2414
SF-2314
Zooming range
(64 ~ 129%)
250-sheet tr ay
Zooming range
(1:1)
250-sheet tr ay
Single manual feed (Standard)
50-sheet multi manual feed unit (SF-MF14)
(Option)
Single manual feed (Standard)
50-sheet multi manual feed unit (SF-MF14)
(Option)
500 + 261 (paper
exit tray) + 205
(option Multi
paper feed unit)
SF-2514 about
30.1kg
(4) First copy time
First copy time5.9sec (Paper feed port: No. 1 tray)
First copy time from
each paper feed port
(5) Jam recovery time: 5 sec (Condition: Jam in a section except
(6) Multi copy
Max. quantity of multi copy99 sheets
(7) Original
Max. original sizeB4/10 × 14″
Original reference
position
DetectionNO
Detection sizeAB series
(8) Copy magnification ratio (SF-2414/2514 only)
Fixed
ratio
AB series3R+3E/129, 122, 115, 81, 70, 64%
Inch series 2R+2E/129, 117, 78, 64%
Zoom width64 ∼ 129%
No. 2 tray (option): 6.8sec
Manual: 5.9sec
for the fuser section, within 6.0 sec from
door open, standard condition.)
Left side, about 12mm from the rear
Inch series
(14) Power consumption
Max. power consumption 1.4 kW
Average power consumption when
operating (Ref. value)
Power consumption in standby
(Ref. value)
Power consumption in pre-heating
(Ref. value)
Power consumption in auto power
shut off (Ref. value)
Auto OFF mode (Ref. value)
Dry heater connected
Dry heater not connected
Energy consumption efficiency49.4 Wh
Note: Max. value when an option is installed.
2. Details of each section
(1) Paper feed
Copying size
(Max. ∼ Min.)
Paper feed system 1 tray + single manual feed
Paper feed capacity250 sheets × 1
AB seriesB4 ∼ A6 (Postcard)
Inch series10 × 14 ∼ 5 1/2 × 8 1/2
Environmental conditions
Observe the following environmental conditions to ensure the copy
quality and machine performance.
1 Standard condition
20 ∼ 25 ˚C, 65 ±5% RH
2 Operational condition
(%)RH
85
60
20
1030 35
(˚C)
3 Shipping condition of copier (within 2 weeks)
(%)RH
90
60
20
-2030 45
(˚C)
4 Supply storing condition
3 Numeral
The end digit of the year of coating.
4 Numeral or X, Y, Z
Indicates the month of coating.
X means October, Y November, and Z December.
56 Numeral
Indicates the day of coating.
7 Numeral or X, Y, Z
Indicates the month of packing.
X means October, Y November, and Z December.
89 Numeral
Indicates the day of packing.
F Alphabet
Indicates the factory of production. "A" is the code for Nara plant.
B. Developer and toner
The lot number of toner is put on the individual cartridge package and
on the group package, and that of toner is put on the bag and the
group package.
The lot number is of 7 digits, each digit indicating as follows:
1
23
456
7
1 Alphabet
Indicates the factory of production.
2 Numeral
Indicates the end digit of the year of production.
34 Numeral
Indicates the month of production.
56 Numeral
Indicates the day of production.
7 Numeral
Indicates the sub lot number.
NormalCAB
1234
(%)RH
90
10
-5
40
(˚C)
Storage period:
OPC drum Max. 30 months from production
Developer/Toner Max. 24 months from production
5 Identification of production number
A. OPC drum
The lot no. is of 10 digits. Each digit indicates as follows. This number
is printed on the F side flange.
123
4
5
6
78
9
10
1 Numeral
Indicates the OPC drum sensitivity.
2 Alphabet
Indicates the model code. "M" is the code for this model.
When a change is made on the product in the same operation system:
NormalCAB
15263748
A,B,C: Operation system
2 – 4
[3] EXTERNAL VIEW AND INTERNAL STRUCTURE
1. External view and internal structure (SF-2514 as the example model)
123456
7
8
9
12
13
16
15
14
2019
No.NameNo.NameNo.Name
Exit tray
1
Document cover
4
Manual bypass guide
7
Paper tray
F
Power switch
I
Toner cartridge
L
Fusing unit (High temperature)
O
SPF exit tray
2
Original guide
5
Manual bypass
8
Front cover
G
Toner cartridge release lever
J
Open/close lever
M
Fusing unit lever
P
11
10
17
18
SPF tray
3
Document table
6
Operation panel
9
Release button
H
Handel
K
Photoconductive drum
N
Upper unit
Lower unit
3 – 1
2. Operation panel
SF-2314
12345
EXPOSURE
AUTO
MANUAL
PHOTO
SF-2414
12345
EXPOSURE
AUTO
MANUAL
PHOTO
11
TRAY SELECT
C
51234
1
6
3
2
8
7
5
4
0
9
6781415 16 17 18
11
1210
7 8
COPY RATIO
1
1
x
129%
5
8
2
1
x
8
11 10 14
2
117%
100%
1
x
78%
8
14
2
1
64%
x
11 5
8
2
913
1
x
8
11
2
2
ZOOM
x
1
x
8
11
2
1
1
x
2
2
8
%
1
6
3
2
8
7
14
C
5
4
0
9
15 16 17 18
TRAY SELECT
51234
6
POWER SAVE
POWER SAVE
SF-2514
1234
AUTO
MANUAL
PHOTO
19 20
TRAY SELECTEXPOSURE
51234
67 8
No.NameNo.NameNoName
Auto/manual/photo key and indicators
1
Misfeed indicator
4
Tray select key and indicators
7
Zoom indicator
F
Zoom keys
I
Clear key
L
SPF misfeed indicator
O
5
COPY RATIO
1
1
1
x
x
2
2
5
1
8
1
8
1
8
8
x
11 10 14
2
x
14
2
x
11 5
2
2
8
11
ZOOM
x
1
x
11
8
2
1
1
x
8
2
2
129%
117%
100%
78%
64%
913
Light and dark keys and exposure
2
indicators
Toner required indicator
5
Paper required indicator
8
Copy quantity display
G
10-key pad
J
Print button and ready indicator
M
SPF indicator
P
11
1210
POWER SAVE
C
%
1
6
3
2
8
7
5
4
0
9
1415 1617 18
Developer replacement lamp
3
Maintenance required indicator
6
Copy ratio selector key and indicators
9
Copy ratio display key
H
Zero/read-out key
K
Power save indicator
N
3 – 2
3. Cross section (SF-2514 as the example model)
1
42
6
87
10
9
11 12 1314 1516 1718 1920
5
4
3
2
21
22
23
24
25
26
27
28
29
30
4041
No.NameNo.NameNoName
No.3 mirror
1
SPF transport roller
4
SPF PS roller lower
7
SPF document takeup roller
F
Discharge lamp
I
Copy lamp
L
Blank lamp
O
No.5 mirror
R
Manual feed take-up roller
U
Tray transport follower roller
X
Option tray transport roller
[
Transfer charger
^
Upper heat roller
a
Lower separation pawl
d
2
5
8
G
J
M
P
S
V
Y
\
_
b
e
37
No.2 mirror
SPF document exit roller
SPF document feed reverse roller
Drum separation pawl
Main charger unit
Lens unit
Developer magnet roller
Developer tank
Manual paper feed follower roller
Transport roller (Upper)
Resist roller
Photoconductor drum
Lower cleaning roller
Upper separation pawl
32333435363839
SPF transport follower roller
3
SPF PS roller upper
6
SPF document feed roller
9
Cleaner unit
H
No.1 mirror
K
No.6 mirror
N
No.4 mirror
Q
Manual paper feed roller
T
Tray paper feed takeup roller
W
Tray paper feed roller
Z
Resist roller
]
Suction belt
‘
Lower heat roller
c
Heater lamp
f
31
3 – 3
4. Switches, sensors, detectors (The SF-2514 as the typical example)
654
7
3
2
9
1
8
11
10
No.AbbreviationFunctionTypeOperation
PODPaper out sensorTransmission photo sensorH when paper is sensed.
1
MHPSMirror home position sensorTransmission photo sensorH at the home position.
2
SDSWSPF cover open/close sensorLead switchH when the cover is open.
3
SPODSPF document out sensorTransmission photo sensorL when paper is sensed.
4
SPPDSPF document transport sensorTransmission photo sensorH when paper is sensed.
5
SPFDSPF document set sensorTransmission photo sensorL when a document is set.
6
LHPDLens home position sensorTransmission photo sensorH at the home position.
7
PWDPaper size (large/small) sensorTransmission photo sensorL with the large size.
8
PPDPaper transport sensorTransmission photo sensorL when paper is sensed.
9
CPED1Tray paper empty sensorTransmission photo sensorH when paper is present.
F
G
PID (MFD1)
Paper sensor for Manual paper feed unit
(only single Manual Paper feed unit)
Transmission photo sensorL when the cover is open.
3 – 4
5. Clutches, solenoids (The SF-2514 as the typical example)
SPMSPF document transport clutchFor SPF transport roller rotation
2
PSPSPaper separation solenoidFor paper separation solenoid drive
3
RRCResist roller clutchFor resist roller rotation
4
TRCTransport roller clutch For transport roller rotation
5
MPFSManual paper feed solenoidFor takeup roller pressing
6
CPFC1Tray paper feed clutchFor paper feed roller rotation
7
SPFMMulti paper feed clutch For multi paper feed roller rotation
8
3 – 5
6. Motors (The SF-2514 as the typical example)
8
432
1
6
5
7
No.AbbreviationNameFunctionType
VFMPaper exit fan motor
1
SPFMSPF motorFor SPF driveDC brushless
2
CFMCooling fan motorFor cooling the optical system DC brushless
3
MMMain motorFor the main body drive and the option driveDC brushless
4
LMLens motorFor the optical lens driveDC stepping
5
MRMMirror motorFor the optical mirror base driveDC brushless
6
TMToner motorFor toner supplyDC synchronous
7
SPFFMSPF cooling fan motorFor cooling the optical system in the SPF modeDC brushless
8
For ventilation of the fuser unit.
For cooling the machine and removing ozone.
DC brushless
3 – 6
7. PWBs (The SF-2514 as the typical example)
2
8
1
4
9
3
5
6
7
No.NameDescription
AC circuit PWBAC power input
1
Discharge lamp PWBDischarge lamp drive
2
Main PWBMain body control
3
AE PWBDocument density auto exposure detection
4
Blank lamp PWBBlank lamp control
5
Lower unit PWBLower unit parts control
6
High voltage PWBSupply of the process high voltage and the developer bias voltage.
7
Operation PWBOperation input, display control
8
SPF control PWBSPF control
9
3 – 7
[4] UNP ACKING AND INSTALLAT ION
1. Packing drawi ng (SF-25 14)
List of packing materials and accessories
NameQ’ty
1Packing case1
2SPF tray1
4SPF cover protection material3
5Body1
6Polyethylene bag for paper exit tray 1
7Vinyl sheet for body1
8Bottom case1
9Bottom case pad (L)1
10Bottom case pad (R)1
11AC cord sleeve1
12Paper exit tray1
14Instruction Manual unit
Instruction Manual1
Dust cover (For some agents)1
Warranty card (For Austraria)1
Warranty resistration (For U.K.)1
Installation report (For Europe
except U.K.)
15Consumable parts kit
Developer1
Toner for installation1
1
2. Installat ion
Installation conditions
The following installing conditions must be satisfied to assure the
normal operations of the machine.
(1) Environment
1 Keep the machine away from direct sunlight and avoid instal-
lation near a window or in a bright place.
(Draw the curtain and close the blind shutter completely.)
The plastic parts and the original cover may be deformed by direct
sunlight. Avoid installation near a window even with frosted glass.
4 – 1
2 Avoid installation in high temperature or high humitity en-
vironments. Also, avoid installation where temperature or
humidity may change quickly. (e.g., near an air conditioner).
Otherwise copy papers may be dampened and condensation may
be generated in the machine. This may result in paper jams or
poor copy quality.
(Ideal conditions): The best suitable conditions for machine
6 Avoid installation where there is inflammable gases or am-
monium gases.
Installation near a diazonium copier may degrade copy quality and
cause malfunctions.
3 Avoid installation where there is a lot of dust or vibrations.
If dust enters the machine, it may degrade copy quality and cause
malfunctions.
4 Avoid installation on an unstable surface.
To assure the proper operations, install on a level surface.
7 Install near a power outlet.
(2) Space around the machine
Allow a space of about 15 cm (6 inches) between the rear side of the
machine and the wall for ventilation of the cooling fan. Also allow
sufficient space around the machine for operations.
(3) Installing table
Use a level (UKOGM0054CSZZ) to install the machine horizontally.
(Allowable tilt: 5 mm between the front and rear frames)
(Note) If the machine is not installed horizontally, toner density con-
trol may not function properly. This may result in poor copy
quality.
4 – 2
(4) Power source
1 The power source should be the rated voltage ±10% with the
capacity corresponding to the max. power consumption.
2 Do not use an extension cord, or operate any other equipment
from the same wall outlet.
(5) Grounding
To avoid electrical hazard, use the properly grounded wall outlet only.
(Carrying the machine)
When carrying the machine, remove the copy tray and hold the dent
portions on the bottom.
[In the case of SF-2314/2414/2514 with SF-MF14 (Optional)
equipped.]
Open the paper feed tray on the right side of the copier.
Remove the No.4/No.5 mirror unit fixing screws (2 pcs.).
Then close the paper feed tray.
3. Installation procedure
(1) Optical system unlocking
1 Unlock the No.2/No.3 mirror unit.
Remove the No.2/No.3 mirror unit fixing screw (1 pc.) on the left
side of the copier.
Mirror unit fixing screw
2 Unlock the No.4/No.5 mirror unit.
Remove the No.4/No.5 mirror unit fixing screws (2 pcs.) on the
right side of the copier.
Mirror unit fixing screw
(2) Cassette setting
1 Pull out the cassette.
Lift the cassette and slowly pull it out from the copier until it stops.
2 Loading copy paper.
Set the copy papers in the cassette. Do not exceed the limit line
indicator.
Mirror unit fixing screw
4 – 3
Gently insert the cassette fully into the copier.
4 Remove the developing unit.
Loosen the fixing screw (step screw) which is fixing the copier and
the developing unit, and slowly pullout the developing unit and
Lenz hold Plate from the copier.
(3) Developer setting
1 Open the front cabinet.
Push the front cabinet open buttons which are on the left and right
sides of the copier, and open the front cabinet.
Front cabinet open button
2 Open the toner cartridge.
While pressing the toner cartridge release lever (B), open the
toner cartridge.
Release lever (B)
Fixing screw
(step screw)
1
2
Lenz hold plate
(SF-2414/2514 only)
Developer unit
5 Remove the developer tank.
Slightly open the pawl which is fixing the developing unit and the
developer tank with a screw driver, and pull out the developer
tank.
Developing unit
Developing
tank
Pawl
6 Supply developer.
Supply a bag of developer to the developer supply port of the
developing unit.
At that time, move the bag of developer to supply developer evenly.
Toner cartridge
3 Remove the toner cartridge.
Slowly turn the toner cartridge clockwise to remove.
2
1
Developing
Developing unit
7 Install the developer tank.
Insert the developer tank to the developing unit along the guide of
the developing unit.
At that time, check that the developer tank is securely fixed in the
developing unit.
Developing unit
Developing tank
4 – 4
8 Install the developing unit.
Slowly insert the developing unit into the copier along the guide of
the copier until it stops.
Tighten the fixing screw which was removed in procedure (D), and
fix the developing unit to the copier.
Fixing screw
(step screw)
2
4 Close the front cabinet.
1
Developer unit
(4) Toner supply
1 Shake the toner cartridge up and down.
Shake the toner cartridge up and down 9 to 10 times.
2 Install the toner cartridge.
Install the toner cartridge to the copier along the guide of the
copier.
Turn the toner cartridge counterclockwise to lock.
1
2
(5) Toner density sensor level check
1 Turn on the power switch of the copier.
2 Adjust the developer level.
(a) Perform the key operations of simulation 25 sub 2.
C00C
252
With the above key operations, simulation 25 is performed and
the developer is stirred for 3 minutes.
(b) After stirring the developer for 3 minutes, the toner density
level is read by the main PWB.
During stirring, the toner density sensor level is displayed on
the MULTI COPY display. (Range: 1 ∼ 99)
[Note] If the simulation is cancelled during execution, the
automatic reading cannot be performed. Do not cancel
the simulation during execution.
(c) Press the CLEAR key three times to cancel simulation 25.
ccc
3 Supply toner.
Remove the sheet from the toner cartridge and supply toner.
Slowly return the toner cartridge to the original position.
4 – 5
(6) Accessory attachment
1 Attach the copy tray.
(2) No.4/no.5 mirror unit (Mirror base C) lock
1 Perform locking with the unit at its home position and with the
external fitting installed.
2 Lock the unit with two mirror unit fixing screws. (The hole in the
right cabinet)
2 Attach the document tray.
[SF-2514 only]
2
1
4. Locking procedure for transit or
repacking
In general, reverse the procedures in "3. Installation procedure." For
the optical system lock, perform the following procedure.
(1) No.2/No.3 mirror unit (Mirror base B) lock
1 Perform locking with the unit at its home position (normal copy
position) with the power ON and with the mirror stopped and with
the external covers installed.
2 Lock the unit with the mirror unit fixing screw. (The hole in the left
cabinet)
Mirror unit fixing screw
[SF-2314/2414/2514 with SF-MF14 (Optional) equipped.]
1 Turn off the power at the 64% position. Perform locking with the
external fitting installed.
Mirror unit fixing screw
Mirror unit fixing screw
2 Open the paper feed tray at the right side of the body, and fix the
unit with two fixing screws. (Two holes in the right cabinet)
4 – 6
5. Optional paper feed unit (SF-CM14),
Installation Manual
For use with compatible SHARP copies.
See SHARP copier Installation Manual to determine suitability.
Included parts
(2) Remove the paper tray from the main copier
unit.
1 While lifting up slightly, gently pull out on the paper tray until it
stops.
2 Then, lift up on the paper tray with both hands and remove it.
Mounting screw A,
1 pc
[SF-2414/2514 only]
Mounting screw B,
2 pc
(1) Set the main copier unit on the paper feed unit.
1 Lift the main copier unit by the grips, place it upon the paper feed
unit, and slip the positioning holes (3 locations) on the bottom of
the main copier unit over the 3 positioning pins on the paper feed
unit.
[NOTE] This procedure should always be performed by two
people.
Grip
Grip
(3) Open the upper unit of the main copier unit.
1 Press the release buttons on the left and right sides of the main
copier unit’s front cover, then open the front cover.
2 Push the upper half release lever (green) to the right and down,
then gently open the upper unit.
Front cover release buttons
Positioning pin
Positioning pin
Front cover
Upper half
release lever
4 – 7
Upper unit
(4) Connect the main copier unit and the paper
feed unit.
1 Secure mounting screw A (1 pc) in the main copier unit (1 loca-
tion).
Mounting
screw A
6. Optional multi bypass feeder unit
Installation Manual
(1) Open the upper unit of the main copier unit.
1 Press the release buttons on the left and right sides of the main
copier unit’s front cover, then open the front cover.
2 Push the upper half release lever (green) to the right and down,
then gently open the upper unit.
(2) Release the lock for the manual bypass unit and
remove the manual bypass unit.
1 Release the manual bypass unit by pressing upward on the rock
claws (green; 2 locations) which lock it in place in the main copier
unit’s upper unit.
The manual bypass unit will come out toward you slighly.
2 Pull out upon the manual bypass unit to remove it from the main
copier unit.
Manual bypass unit
Then, gently close the upper unit and front cover.
2 Connect the paper feed unit and the main copier unit by securing
mounting screw B (2 pcs) in the mounting holes (2 locations)
located in the slot from which the paper tray was removed.
Mounting screw B
After these procedures have been completed, reload the paper
*
tray which was removed in step 2.
3 Insert the paper feed unit connector into the jack on the side of the
main copier unit.
Rock claw (latch)
Rock claw (latch)
Connector
4 – 8
(3) Mount the multi bypass feeder unit onto the
main copier unit.
1 Slide the positioning pins which project from the multi bypass
feeder unit in to the grooves in the main copier unit, then push the
multi bypass feeder unit into place to in stall it.
At this time, to be sure that the multi bypass feeder unit is securely
installed, push down once more on the fourcorners of the unit. (If it
has not been securely installed, "CH" may appear in the COPIES
MADE display when the power is turned on.)
Multi bypass feeder unit
Rock claw (latch)
Rock claw
(latch)
2 Close the upper unit of the main copier unit.
Positioning pins
Positioning pins
Multi bypass
feeder unit
4 – 9
[5] GENERAL DESCRIPTIONS OF
EACH SECTION
The general descriptions of the following sections are given:
1 Paper feed section
2 Separation, transport section
3 Fuser, paper exit section
4 Developer section
5 Optical system
6 Image forming section
7 SPF section (SF-2514 only)
Internal structure
7
When the CPCF turns off, rotation is stopped, and the takeup roller is
pushed up by the roller release arm spring to the position.
5
3
6
4
2
1
1. Paper feed secti on
The paper feed system is in two ways: the tray feed and the manual
feed. The cassette is of the universal type and has the capacity of
250 sheets. It is attached and detached at the front cabinet, that is,
the front loading system.
The manual paper feed is single for the SF-2314 and multi for the
SF-2414/2514. (The multi paper feed unit (SF-MF14) is an option for
the SF-2314 only.)
In addition to the standard cassette (250 sheets), the optional cassette module (SF-CM14, 250 sheets) can be added.
(Tray paper feed operation)
The cassette paper feed clutch (CPFC) turns on, the paper feed roller
shaft, the paper feed roller, and the takeup roller rotate. At the same
time, the roller release arm is lowered by the limiter spring. As a
result, the takeup roller falls by its own weight to reach the paper
surface, performing the paper feed operation.
(Manual paper feed operation) Multi
When the solenoid B (MPFS) turns on, the takeup roller falls and the
gate rises.
Almost simultaneously the solenoid A (MPFC) turns on and the
takeup roller and the paper feed roller turns to perform the paper feed
operation.
ON
When the PPD turns on, the MPFS turns off and the RRC turns on.
Almost simultaneously the MPFC turns off to return the roller and the
gate to the initial state.
5 – 1
OFF
2. Separation, transport section
4. Developer section
After passing the resist roller section, the paper is transported to the
transfer section. After transfer, the paper is separated from the drum
by the separation electrode and the drum separation pawl, then
transported to the fuser section by the transport belt.
3. Fuser, paper exit section
The toner image transferred on the paper is fused by the heat and
pressure of the upper and the lower heat rollers. After fusing, discharge static electricity on the paper with the discharge brush. Then
the paper is discharged to the copy tray.
4-1. General descriptions
(1) Two-component developer
The developer is composed of toner and carrier.
Carrier serves as a medium for attaching toner onto the electrostatic
image on the photoconductor drum.
By stirring toner and carrier, they are rubbed to be charged positive
(+) and negative (–) respectively.
Since developer will deteriorate to degrade copy quality, it should be
replaced regularly.
(2) Two-component magnetic brush development
The rotatable non-magnetic sleeve is provided over the magnet roller
and is rotated.
Carrier forms a magnetic brush on the sleeve surface by magnetic
force to attach toner onto the electrostatic image on the photoconductor drum.
(3) Developing bias
When the photoconductor is charged and exposed to light (exposure), the surface potential (voltage) of the photoconductor will not
be lost completely. (The residual potential remains.)
Toner is attracted to the photoconductor by this residual potential,
dirtying the photoconductor. As a result, a dirty copy of white background is generated.
To prevent against this, a voltage of the same polarity and higher
than the residual potential is applied to the MG roller, preventing toner
from being attached to the photoconductor surface.
• Temperature control
Heat roller surface
temperature detection
The heat roller is heated by the
heater lamp.
(When the heat roller surface
temperature is 180 C˚ or lower,
the heater lamp is actuated)
Contact open (*)
Abnormal high
tem p erature
CPU
(Heater troub l e)
Self diag di spl ay
Thermistor
Heat r olle r
Heater lamp
Thermostat
• Abnormally high temperature (H3)
• Abnormally low temperature (H4)
• Thermistor disconnection (H2)
When the thermostat contact is open, it is required to press the
*
reset button in the upper side of the thermostat. (The contact is not
reset automatically.)
Toner
Carrier
Residual potential < DV BIAS
MG roller
DV BIAS
-200V
Developing bias voltage
5 – 2
5. Optical system
5-1. General descriptions
• The optical system is composed of the fixed focus lens and six
mirrors.
Since the fixed focus lens is employed, No.4/No. 5 mirror base is
moved as well as the lens to change the distance between the
document and the drum (OID, Original Image Distance) for reduction and enlargement.
To move the lens and No.4/No. 5 mirror unit, he stepping motor is
driven by the signal from the main control PWB to allow zooming
of 0.70 to 1.22 (inch series: 0.64 ∼ 1.29) with 1% increment. (The
SF-2314 has no zooming function, and its lens and No.4/No.5
mirror base are fixed.)
4
5
10
• Exposure is adjusted by changing the voltage of the copy lamp.
The copy lamp unit is provided with the AE sensor for detection of
the original density to adjust the light quantity of the copy lamp
according to the original density.
• For exposure, the slit exposure system is employed where the light
source is moved. (The original table is fixed.)
12
9
17
615
127
1311316
814
1Copy lamp2Reflector3No. 1 mirror
4No. 2 mirror5No. 3 mirror6Lens
7No. 4 mirror8No. 5 mirror9No. 6 mirror
FNo. 2/No. 3 mirror base unitGCopy lamp unitHNo. 4/No. 5 mirror base unit
IMirror motorJLens/No. 4/No.5 mirror base drive motorKLens home position sensor
LMirror home position sensorMAuto exposure sensor
(1) Original table
The original table is fixed, and originals are set to the left frame side
as the reference.
(2) Copy lamp
100V s ystem (285W)
200V s ystem (285W)
(3) Mirror
Six mirrors are used.
No. 1 mirror is provided in the copy lamp, No. 2/3 mirrors at the
No.2/3 mirror base, No. 4/5 mirrors at the No. 4/5 mirror base. The
No.2/3 mirror base is scanned during copying. The No.4/5 mirror
base is moved to change the distance between the original and the
photoconductor during zoom copying.
(4) Lens (Fixed focus lens)
• Construction (One group 3 lenses)
• Brightness(F8)
• Focus(175mm)
(5) Lens home position sensor (LHPS)
This sensor is used to sense the lens position. The sensor output
signal serves as the basic signal to control the copy magnification
ratio.
(6) Lens base
The lens is mounted to this lens base. It is moved in the paper feed
direction in reduction copying, and in the paper exit direction in enlargement copying.
5 – 3
(7) Lens drive shaft
This shaft is to control the optical axis of the lens in zoom copying.
The lens follows on the slide base shaft.
(8) Lens drive wire
The wire is used to drive the lens base and the 4/5 mirror base.
(9) No. 4/5 mirror base
The No. 4/5 mirror is installed to this base. It is moved in zoom
copying in order to fit the distance between the original and the
photoconductor.
(10) Mirror motor
The mirror motor is a stepping motor, and used to move the copy
lamp unit and the No. 2/3 mirror base in order to obtain the rpm
corresponding to each magnification ratio.
(11) Mirror home position sensor (MHPS)
Used to sense the home position of the copy lamp unit. This sensor is
a photo transmission type sensor.
(12) No. 2/3 mirror base
The No. 2/3 mirrors are attached to this base. The mirror base is
scanned by the mirror motor.
(13) Copy lamp unit
This is composed of No. 1 mirror, the thermal fuse, the copy lamp,
the exposure adjustment plate, and the reflector, and is scanned by
the mirror motor.
5-2. Basic operati on s
(Relationship among the original, the lens and the image in each
magnification ratio)
Normal copy: The distance between the surface of original on the
table glass and the lens is made equal to the distance
between the lens and the exposure surface of the
photoconductor to make the original and the image
equal to each other.
Enlargement copy: The lens is nearer to the original when compared
with the normal copy to shorten the distance between the original surface and the lens.
The No. 4/5 mirror base is positioned further
away from the lens to increase the distance between the lens and the exposure surface of the
photoconductor.
The distance between the original and the exposure surface of the photoconductor is greater
than that in the normal copy.
(14) Thermal fuse
The thermal fuse is closely attached to the reflector in order to
prevent against abnormal temperature rise in the optical system. In
case of abnormal temperature rise, the power for the copy lamp is
turned off.
100V system
200V system
(117˚C)
(117˚C)
(15) Reflector
Light from the copy lamp is reflected onto the original.
(16) Exposure adjustment plates
Three exposure adjustment plates are attached to the copy lamp unit
to adjust the exposure balance in the front and the rear frame direction.
(17) Mirror base drive wire
This wire is used to transmit the drive power of the mirror motor to the
copy lamp unit and the No. 2/3 mirror base to scan the mirror base.
(18) Lens drive motor
This is a stepping motor, which is used to move the lens and the No.
4/5 mirror base.
(19) AE sensor
The original density is detected with the intensity of the copy lamp
light reflected from the original. The measurement area is the mirror
base scan area of about 100mm at the center.
The element is a photo diode.
Reduction copy: When compared with the normal copy, the lens
comes closer to the photoconductor to increase the
distance between the original and the lens. The
distance between the lens and the exposure surface of the photoconductor is decreased.
The No. 4/5 mirror base is positioned further away
from the lens.
The distance between the original and the exposure
surface of the photoconductor is longer than that in
the normal copy.
5 – 4
The mirror base scan speed (mirror motor rpm)
is changed t o z oom.
The SF-2314/2414 perform dirt correction by changing the copy lamp
intensity according to the dirt degree in the optical system (the copy
lamp unit, No. 1 mirror, No.2 mirror, No.3 mirror) to prevent against
remarkable degrading of copy quality.
The reference value is the AE sensor output value which is obtained
when the reference plate is exposed with the copy lamp voltage of
67.7V (135.4V) at power ON.
This value is checked with sim 44-02.
Reference plate (Glass holder)
Table glass
Copy lamp light quantity "UP"
Original
(Copy lamp control in each copy density)
80
70
CLV
(Copy lamp
application
voltage)
60
50
40
(V)
Reduction
[MAX. 85V(170V)]
[MIN. 40V(80V)]
The lens
and the
mirror are
move to
zoom.
Automatic exposure
sensor
CPU
Reference value
> Measured value
Correction data output
EX1
234
EX5
5 – 5
6. Copy process
(1) Photoconductor
• This model uses OPC (organic photoconductor) as photoconduc-