AR-M700 (serv.man19). Details of each section - 4 Image process section - Sharp Copying Equipment Service Manual (repair manual)

ar-m700 (serv.man19) service manual
Model
AR-M700 (serv.man19)
Pages
26
Size
5.65 MB
Type
PDF
Document
Service Manual
Brand
Device
Copying Equipment / Details of each section - 4 Image process section
File
ar-m700-sm19.pdf
Date

Read Sharp AR-M700 (serv.man19) Service Manual online

: Feb. 6 2004
1
AR-M550/M620/M700  DETAILS OF EACH SECTION  6 - 63
4. Image process section
A. General
Toner is attached to electrostatic latent images formed by the laser
beams which were radiated to the OPC drum charged by the main
charger, forming toner images. 
The toner images formed on the OPC drum are transferred to paper by
the transfer belt.
Composition and Applied Voltage of the Process Section
1
2
5
3
4
No.
Name
Operation
1
Toner hopper unit, toner bottle unit
Provides toner to the developing unit, and collects waste toner in the front section of the toner bottle 
unit (waste toner box section). 
2
Developer unit
Mixes toner and carrier, and attaches toner to electrostatic latent images to form visible images.  
3
Process drum unit
Forms images (electrostatic latent images, visible images) on the OPC drum. 
4
Transfer unit
Transfers toner images to the OPC drum. 
5
Main charger unit
Charges the OPC drum surface negatively and evenly. 
No.
Name
Functions
1
Laser beams
Forms electrostatic latent images on the OPC drum. (Writing resolution: 600dpi)
Radiated from the LSU. The output can be set with the simulation. (Basically not changed from the default.)
2
OPC drum
Electrostatic latent images are formed by laser beams. Toner is attracted to the latent electrostatic images 
and transferred to paper. An OPC drum is employed. The diameter is 80mm. 
3
Main charger
Applies a high voltage to charge the OLPC drum. The saw teeth type is employed. 
4
Screen grid
Carries electric charges from the main charger to the OPC drum evenly. 
5
MG roller
Forms a magnetic brush with developer, and applies toner to the OPC drum. -500V
6
Developing doctor
Keeps the thickness of developer or toner layer on the MG roller at a fixed level. 
7
Toner concentration sensor
Detects toner in the developing tank. The transmission type sensor is employed. 
1
-590v
-6.2kv (700
µ
A)
-2.0kv
-100v
-500v
+150v
AC4.5kv
+2.0kv
10
8
Transfer belt
cleaning mode
Cleaning roller
cleaning mode
Transfer mode
Developing 
mode
Cleaning 
mode
Cleaning mode
4
3
5
1
13
6
8
2
9
11
12
10
7
2.0 - 2.5kv (40
µ
A)
AR-M700N/U
1
1
1
1.0 - 1.5kv (35
µ
A) 
AR-M550N/U,
AR-M620N/U
: Feb. 6 2004
1
AR-M550/M620/M700  DETAILS OF EACH SECTION  6 - 64
[Toner hopper and toner bottle section] 
A. Outline
Adoption of the rotating toner bottle enables large capacity with a com-
pact toner bottle size. 
When the remaining toner detection sensor in the toner hopper unit
detects no toner, the toner bottle turns to supply toner to the toner hop-
per. Following supply, since the sensor detects full or empty status
inside the toner hopper based on a standard quantity of approximately
150 g of toner, even if the toner cartridge becomes empty, copying is
not immediately suspended because toner inside the toner hopper is
used (approximately 5K/6% print duty documents).
8
Transfer roller
Applies a voltage to transfer toner from the OPC drum to paper. 
9
Drum separation pawl
Separates paper from the OPC drum mechanically. 
10
Cleaning blade
Cleans and scrapes toner from the OPC drum.
11
Resist roller
Deflects paper to adjust the paper feed timing to the process section. 
12
Paper dust cleaner
Remove paper dust from the resist roller to reduce paper dust entry to the process section.
13
Discharge lamp
Discharges residual potential on the OPC drum by the lamp light.
No.
Name
Functions
1
1
Destination
Toner filling amount
Life with 6% print duty 
documents
Except Japan
1,430g/1,650g
72,000 sheets/83,000 sheets
Japan
1,275g
50,000 sheets
1
1
AR-M550/M620/M700  DETAILS OF EACH SECTION  6 - 65
B. Major parts and signal functions
Code
Signal 
name
Name
Function/Operation
Type
Model
Note
TM1X
TM1X
Toner motor 1
Transports toner in the toner hopper to 
the developing unit. /Transports waste 
toner to the waste toner section.
Synchronous 
motor
TM2X
TM2X
Toner motor 2
Transports toner in the toner bottle to the 
toner hopper. 
Synchronous 
motor
TFSD
TFSD
Toner remaining quantity 
detection signal
Toner hopper remaining quantity 
detection
CRUM
CRUM lap
Stores the toner bottle information.
No.
Name
Operation
1
TH shutter
Serves as a shutter to supply toner from the toner bottle unit to the toner hopper. When a toner bottle 
unit is installed, the shutter opens.
2
Toner mixing roller
Mixes toner in the toner hopper.
3
Waste toner box drive gear
Drives the waste toner transport parts.
4
Waste toner transport plate
Remains toner evenly in the waste toner box.
5
Waste toner transport plate
Remains toner evenly in the waste toner box.
6
Waste toner shutter
Serves as a shutter to receive waste toner from the process unit.
7
TH shaft
Toner supply roller to the toner unit section.
8
Toner supply roller
Toner supply roller to the developing unit section.
TM2X
TM1X
1
7
6
5
4
3
2
10
9
8
11
12
9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
12
11
10
12
11
10
4
3
2
1
4
3
2
1
2
1
1
2
2
1
1
2
PCU PWB
CRUSDA
CRUCLK
+5V2
GND2
B12B-PHDSS-B
CN-11
TNCA
GND2
+24V1
TM1a
TM1b
TM2a
TM2b
TFSD
+24V1
TFSD
GND2
TM1a
TM1b
GND2
+5V2
CRUCLK
CRUSDA
GND2
(NC)
(NC)
SRA-01T-3.2
GND2
PHR-4
+24V1
(NC)
TFSD
CRUCLK
CRUSDA
GND2
DRAWER TSR-04V-K
+5V2
SMR-02V-N/SMP-02V-NC
TM1a
TM1b
SRA-01T-3.2
SMR-02V-N/SMP-02V-NC
TM2a
TM2b
TSDP-12V-K/TSDR-12V-K
TONER HOPPER
8
7
2
1
TFSD
3
2
7
8
1
6
5
4
TFSD
CRUM
AR-M550/M620/M700  DETAILS OF EACH SECTION  6 - 66
C. Operational descriptions
(1) Composition
The toner cartridge is composed of the toner bottle with toner filled in it,
the TB holder lower which holds the toner bottle and to which the
CRUM and the waste toner box assembly are attached, and the TG
holder upper.
The TB holder lower is attached to the TB shutter. When inserting it to
the machine, the toner hopper rib releases the shutter lock pawl, and
opens in linkage with the TH shutter. When removing the toner car-
tridge from the machine, the TB shutter closes.
NOTE: The toner discharge port of the toner bottle is sealed by the
heat seal. Do not rotate the toner bottle manually, or the heat
seal is dismantled and toner is discharged from the TB shutter
port.
(2) Operation
The toner remaining quantity sensor in the toner hopper detects the
toner remaining quantity by the toner stirring roller rotation. When there
is little toner, the toner bottle rotating motor of the machine is rotated.
The toner bottle rotates at 4.2rpm. Toner of about 54g is supplied to
the toner hopper for every rotation. When toner full is not detected after
detecting the state with little toner for a certain period (4min), the toner
cartridge is judged as empty, and the display to urge toner cartridge
replace is shown on the operation panel.
NOTE: When the power is turned on for toner hopper replacement or
cleaning, the toner cartridge replacement display is shown
though toner is not accumulated enough in the toner hopper.
In such a case, turn off/on the power again.
Shutter lock pawl
TB holder upper
Toner bottle
Toner bottle
TB shutter
TB holder lower
CRUM
CRUM
TH shutter
TB holder upper
Heat seal
TB holder lower
Page of 26
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