AR-M620 (serv.man16). (6b) Laser scan unit, Image process section, Scanner section, Fusing section, SPF section - Sharp Copying Equipment Service Manual (repair manual)

ar-m620 (serv.man16) service manual
Model
AR-M620 (serv.man16)
Pages
71
Size
13.91 MB
Type
PDF
Document
Service Manual
Brand
Device
Copying Equipment / (6b) Laser scan unit, Image process section, Scanner section, Fusing section, SPF section
File
ar-m620-sm16.pdf
Date
Next: Sharp AR-M620 (serv.man17) Service Manual

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AR-M550/M620  DETAILS OF EACH SECTION  6 - 60
3. Laser scan unit (LSU)
A. General
This section performs the following operations. 
Image data sent from the MFP (image process circuit) through the
mother board and PCU are converted into laser beams to radiate onto
the drum surface.
B. Major parts and signal functions
Code
Signal 
name
Name
 Type
Function/Operation
MODEL
NOTE
PGM
PGM
Polygon mirror (motor)
Reflects laser beams at the constant rotation speed.
BD
BD PWB
Detects the laser scan start timing. This device is 
used to detect a laser trouble.
No.
Name
Function
1
Laser control PWB
Controls laser beam flashing and the output value.
2
Cylindrical lens
Converges laser beams to focus.
3
Incidence reflection mirror
Assures the optical path for laser beams.
4
No. 1 mirror
Assures the optical path for laser beams.
5
f
θ
 lens 1
Deflects laser beams so that the laser scan speeds on the both ends of the drum and that at the center 
of the drum are the same.
6
f
θ
 lens 2
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
12
11
10
12
11
10
9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
12
11
10
12
11
10
13
14
15
16
17
18
13
14
15
16
17
18
4
3
2
1
6
5
4
3
2
1
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
BD
PGM
GND2
GND2
+5VLD
GND2
/PMCLK
/READY
/START
+24V1
+24V1
GND2
GND2
VRB
GND2
GND2
GND2
GND2
GND2
GND2
GND2
/LDON
LSU S/H
/SYNC
+5V2
+5V2
CN-22
B30B-PHDSS-B
VIDEO
/VIDEO
GND2
GND2
GND2
GND2
GND2
/LDON
LSU S/H
/SYNC
/VIDEO
VIDEO
GND2
SMP-18V-NC/SMR-18V-N
GND2
GND2
+5VLD
GND2
/PMCLK
/READY
/START
+24V1
+24V1
GND2
GND2
VRB
GND2
+5V2
+5V2
LD PWB
GND2
/SYNC
GND2
/PMCLK
/START
GND2
+24V1
/READY
B6B-PH-K-S
B30B-PHDSS-B
GND2
GND2
+5VLD
GND2
/PMCLK
/READY
/START
+24V1
+24V1
GND2
GND2
VRB
GND2
GND2
GND2
GND2
GND2
GND2
GND2
/LDON
/VIDEO
VIDEO
LSU S/H
/SYNC
+5V2
+5V2
+5V2
LSU UNIT
SMP-12V-NC/SMR-12V-N
TEST
TEST
TEST
(NC)
(NC)
TEST2
TEST3
TEST2
TEST3
TEST3
TEST2
/BRAKE
/BRAKE
CN-2
B4B-PH-K-S
PCU PWB
CN-1
CN-3
CN-6
CN-6
CN-8
CN-8
MOTHER
 PWB
MFP 
CONTROL
PWB
1
2
3
4
5
6
8
9
10
7
AR-M550/M620  DETAILS OF EACH SECTION  6 - 61
C. Operational descriptions
[Laser optical path]
∗
This unit must not be disassembled in the market.
(1) Polygon mirror motor
The number of mirror surfaces and the motor RPM are reduced to
reduce noises and increase reliability.
(2) Outline of LSU specifications
7
BD PWB
Detects the timing of laser scan start. This device is used to detect a laser trouble. 
8
No. 2 mirror
Converges laser beams to focus. 
9
Plane lens
Assures the optical path for laser beams.
10
Convergence lens for BD
Converges laser beams onto the BD PWB.
No.
Name
Code, signal name
Function
RW
Control signal 
+5VLD
5V power for laser diode
RW
Control signal
/READY
Polygon mirror motor READY signal ("L" in the constant speed rotation)
RW
Control signal 
/PMCLK
Clock signal for driving the polygon mirror motor
RW
Control signal
/START
Polygon mirror motor drive start signal
RW
Control signal 
/VIDEO
VIDEO (Image signal)
RW
Control signal
/SYNC
Sync signal (SYNC) from BD, sync signal for 1 line
No.
Name
Function
Model
Number of 
mirror surfaces
Rotation 
speed
Bearing
Remark
55PPM
14 surfaces
34000rpm
AIR
Superior in silence
62PPM
14 surfaces
34000rpm
AIR
Effective scan width:
297mm
Resolution:
600dpi
Beam diameter:
Main scan = 60 -  85 
µ
m
Sub scan = 75 - 110 
µ
m
Laser power:
0.385±0.04mW
LD wave length:
770 - 795nm
AR-M550/M620  DETAILS OF EACH SECTION  6 - 62
D. Maintenance and parts replacement
(1) Maintenance and parts replacement
(List of Replacement Parts)
a. Process cooling fan unit
1) Pull out the multi paper feed tray, and remove the manual paper
feed cover F.
2) Pushing the lower part, remove the right cabinet center.
3) Disconnect the connector, and remove the process cooling fan
unit.
a-1. Machine temperature sensor
1) Remove the right cabinet middle. (See “a. Process cooling fan unit”
in this section)
2) Disconnect the connector, release the pawl, and remove the
machine temperature sensor.
a-2. Process cooling fan motor 1 (LSU, process section)
a-3. Process cooling fan motor 2 (LSU, process section)
a-4. Process cooling fan motor 3 (LSU, process section)
1) Remove the process cooling fan unit. (See “a. Process cooling fan
unit” in this section)
2) Disconnect the connector, and remove the process cooling fan
motors 1(A), 2(B), and 3(C).
b. LSU
1) Remove the process cooling fan unit. (See “a. Process cooling fan
unit” in this section)
2) Disconnect the connectors to remove the LSU unit.
No.
Unit
Parts
a
Process cooling fan unit
1
Machine temperature sensor
2
Process cooling fan motor 1 
(LSU, process section)
3
Process cooling fan motor 2 
(LSU, process section)
4
Process cooling fan motor 3 
(LSU, process section)
b
LSU
a-1
a-2
b
a
a-3
a-4
A
B
C
AR-M550/M620  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. 
-590v
-6.2kv(700
µ
A)
-2.0kv
-300v
+500v
-150v
AC4.5kv
(P-P)
+2.0kv
(35
µ
A)
(1.5 - 2.0kv)
10
8
Ω
Transfer belt
cleaning mode
Cleaning roller
cleaning mode
Cleaning mode
Transfer mode
Cleaning 
mode
Developing 
mode
4
3
5
1
3
6
8
2
9
11
12
10
7
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AR-M620 (serv.man127) ENHANCEMENT OF STRENGTH OF DSPF (SPF) ADJUST PLATES F R. Technical Bulletin 2 409.12 KB
AR-M620 (serv.man128) CHANGE TO THE TONER DENSITY REFERENCE SETUP PROCEDURE IN THE INSTALLATION MANUAL. Technical Bulletin 2 171.43 KB
AR-M620 (serv.man129) ARE888 TONER CARTRIDGE NOT FITTING CORRECTLY, DUE TO THE TONER HOPPER CONNECTOR PLATE DEFORMING. Technical Bulletin 2 285.57 KB
AR-M620 (serv.man130) ARE882-F2-00 ETC. DUE TO POOR CONTACT BETWEEN TRANSFER AC TERMINAL AND TRANSFER ELECTRODE SPRING. Technical Bulletin 2 343.86 KB
AR-M620 (serv.man131) Counter Measures Taken When Copy lamp Is Not Switched On Due To Glass Being Charged Technical Bulletin 2 85.72 KB
AR-M620 (serv.man132) Strength Improvement Of The Output Axis Gear Of The Lift Motor A Technical Bulletin 2 75.64 KB
AR-M620 (serv.man133) FINISHER TRANSFER MOTOR FAILURE Technical Bulletin 2 54.29 KB
AR-M620 (serv.man134) ROM Version Update (17) Please See Bulletin For Details Technical Bulletin 5 28.46 KB
AR-M620 (serv.man135) Improvement Of The Fusing Unit Technical Bulletin 6 169.37 KB
AR-M620 (serv.man136) Improvment in initial low Density, Halftone density and such Technical Bulletin 122.99 KB
AR-M620 (serv.man137) LIFT UP MOTOR FAILURES ARE816 Technical Bulletin 2 229.08 KB
AR-M620 (serv.man138) Part change information to fuser unit. Technical Bulletin 3 163.25 KB
AR-M620 (serv.man139) ROM version update..15 Technical Bulletin 2 65.87 KB
AR-M620 (serv.man140) 052-Change to new type flash ROM (ELEM) Technical Bulletin 2 140.44 KB
AR-M620 (serv.man141) 051-Making LCD, FFC and LVDS INV board service parts available as a kit. Technical Bulletin 2 58.14 KB
AR-M620 (serv.man142) Improvement of the fusing unit. Technical Bulletin 3 183.54 KB
AR-M620 (serv.man143) Update to tech bulletins 048 (ARM550U M620U), 030 (ARM700U). Improvement for initial low density and halftone density. Technical Bulletin 1 107.7 KB
AR-M620 (serv.man144) Improvement for initial low density and halftone density. Technical Bulletin 2 112.88 KB
AR-M620 (serv.man145) Measures to prevent double feeding and noise from tandem sheet feeder. Technical Bulletin 2 50.9 KB
AR-M620 (serv.man146) ROM upgrade, only for when the ARLC7 is being installed. Technical Bulletin 2 104.1 KB
AR-M620 (serv.man147) Change in I F connectors for coin vendors. Technical Bulletin 1 25.38 KB
AR-M620 (serv.man148) ROM Upgrade..12 Technical Bulletin 3 12.56 KB
AR-M620 (serv.man149) Additions to details described in simulation 62-10. Technical Bulletin 1 36.84 KB
AR-M620 (serv.man150) Measures against noise generated from the toner motor on the toner cartridge. Technical Bulletin 3 40.16 KB
AR-M620 (serv.man151) Improvement in halftone image quality. Technical Bulletin 6 1.53 MB
AR-M620 (serv.man152) Performance enhancements with ROM upgrade 10.v4.00 Technical Bulletin 2 104.81 KB
AR-M620 (serv.man153) Prevention of thermistor marks appearing on the upper fuser roller. Technical Bulletin 1 18.02 KB
AR-M620 (serv.man154) Prevention of the paper discharge actuator becoming detached. Technical Bulletin 1 25.17 KB
AR-M620 (serv.man155) To reduce paper skew or paper misfeeding when duplex copying printing. Technical Bulletin 2 104.81 KB
AR-M620 (serv.man156) Improvement to clear waste toner from the process unit. Technical Bulletin 6 1.69 MB
AR-M620 (serv.man157) Remedy for U2-50 error that occurs when a security kit is installed. Technical Bulletin 3 187.32 KB
AR-M620 (serv.man158) 032-Increased margins of detection for MPRD2 sensor in the interface pass unit. Technical Bulletin 2 44.51 KB
AR-M620 (serv.man159) 034-Increase adhesion strength of the oil roller to the core shaft. Technical Bulletin 2 49.67 KB
AR-M620 (serv.man160) 033-Rom upgrade 10 Technical Bulletin 2 48.13 KB
AR-M620 (serv.man161) 031-Measures against misfeeding at POD1_N, due to breaking chipping of the upper fuser pawls and the drum pick off pawls. Technical Bulletin 8 339.86 KB
AR-M620 (serv.man162) 030-Discontinued use of the one-way gear (30T) in the left-hand door unit. Technical Bulletin 2 101.36 KB
AR-M620 (serv.man163) 029-Improvement to prevent the deformation of the door switch lever. Technical Bulletin 1 20.82 KB
AR-M620 (serv.man164) 028-Change of side seal R on the processing unit. Technical Bulletin 1 60.63 KB
AR-M620 (serv.man165) 027-Prevention against indicating incorrect paper size on the manual paper feed tray. Technical Bulletin 2 45.47 KB
AR-M620 (serv.man166) 026-To prevent an abnormal noise generated from the waste toner transport idle gear. Technical Bulletin 1 48.98 KB
AR-M620 (serv.man167) 025-Prevention of POD1_N misfeeds due to the paper being caught on the broken upper separator pawl of the fusing unit. Technical Bulletin 1 42.72 KB
AR-M620 (serv.man168) 024-Improvement for the white void of the second side when a thin paper document is duplexed using the SPF. Technical Bulletin 1 42.17 KB
AR-M620 (serv.man169) 023-Prevention of POD1_N misfeeds due to the paper caught on the drum separator pawl section. Technical Bulletin 4 225.7 KB
AR-M620 (serv.man170) 022-Adjustment required when the CIS unit or the CIS pwb is replaced. Technical Bulletin 1 8.36 KB
AR-M620 (serv.man171) 021-To prevent blurr sections at the end of an A3 copy. Technical Bulletin 1 7.49 KB
AR-M620 (serv.man172) 020-Improvement made to prevent rib of first second paper feed (tandem paper feed) from being broken. Technical Bulletin 2 110.23 KB
AR-M620 (serv.man173) 019-Improvement of the reset ability of the conveyance sensors for the fifth tray interface and the manual bypass feeder. Technical Bulletin 2 37.14 KB
AR-M620 (serv.man174) 018-Change in the MC cleaner handle. Technical Bulletin 2 90.33 KB
AR-M620 (serv.man175) 017-H4-02 Trouble Technical Bulletin 2 68.03 KB
AR-M620 (serv.man176) 016-To enhance reliability of the fuser unit pressure roller in line with the ARM700 Technical Bulletin 6 478.63 KB
AR-M620 (serv.man177) Improvement on the deformating of door switch lever Technical Bulletin 1 86.89 KB
AR-M620 (serv.man178) ROM Upgrade .7 Technical Bulletin 2 35.6 KB
AR-M620 (serv.man179) Change of shape of jam release junction shaft in output paper section Technical Bulletin 1 89.5 KB
AR-M620 (serv.man180) Change of intake mechanism drive shaft in manual Technical Bulletin 1 73.36 KB
AR-M620 (serv.man181) Change of first second paper feeder PG upper part Technical Bulletin 1 96.71 KB
AR-M620 (serv.man182) Change of paper detection actuator and separation roller cover in manual paper feeder units Technical Bulletin 2 95 KB
AR-M620 (serv.man183) Addition of INT SP harness in rear frame section Technical Bulletin 1 128.78 KB
AR-M620 (serv.man184) Change of side seals in process unit Technical Bulletin 1 111.8 KB
AR-M620 (serv.man185) Stay for the fixing section has been changed, and the auxiliary CL roller SP has been added. Technical Bulletin 1 92.04 KB
AR-M620 (serv.man186) Irregular sound caused by Tandem Cover Unit Technical Bulletin 2 147.68 KB
AR-M620 (serv.man187) Dragon fuser mod kit, please refer to Technical Bulletin 016 for further details. Technical Bulletin 4 77.18 KB
AR-M620 (serv.man188) Upgrading of ROM version (6) Technical Bulletin 4 393.36 KB
AR-M620 (serv.man189) Correction for DC power blowout due to contact of EMI filter and CIS cover Technical Bulletin 2 188.89 KB
AR-M620 (serv.man190) Additional work for replacing photoconductive drum Technical Bulletin 1 39.68 KB
AR-M620 (serv.man191) ROM upgrade .. (4), (5) Technical Bulletin 3 39.58 KB
AR-M620 (serv.man72) REF. ARE932 Energy Star ROM UPGRADE ... (18). WITH AR-P19 NON-ELEM Driver / Update 222.52 KB
AR-M620 (serv.man73) REF. ARE932 Energy Star ROM UPGRADE ... (18). WITH AR-P19 ELEM Driver / Update 197.12 KB
AR-M620 (serv.man74) REF. ARE932 Energy Star ROM UPGRADE ... (18). WITHOUT AR-P19 ELEM Driver / Update 9.72 MB
AR-M620 (serv.man75) REF. ARE932 Energy Star ROM UPGRADE ... (18). WITHOUT AR-P19 NON-ELEM Driver / Update 9.72 MB
AR-M620 (serv.man76) ARM550 620 700 OSA Firmware V5.d51 ELEM Driver / Update 12.82 MB
AR-M620 (serv.man77) ARM550 620 700 OSA Firmware V5.d51 Non ELEM Driver / Update 12.81 MB
AR-M620 (serv.man78) P19 Firmware Update For 'U' Version Models Vp4.05 Driver / Update 13.14 MB
AR-M620 (serv.man79) P19 Firmware Update For 'U' Version Models (ELEM) Vp4.05 Driver / Update 13.15 MB
AR-M620 (serv.man80) Firmware Update For 'U' Version Models Vu4.05 Driver / Update 10.61 MB
AR-M620 (serv.man81) Firmware Update For 'U' Version Models (ELEM) Vu4.05 Driver / Update 10.62 MB
AR-M620 (serv.man82) DSK Firmware October 2007 Driver / Update 13.38 MB
AR-M620 (serv.man83) DSK Firmware October 2007 (ELEM) Driver / Update 13.38 MB
AR-M620 (serv.man84) Non-Elem type firmware. u4a.04 Driver / Update 10.72 MB
AR-M620 (serv.man85) ARM550 620 700 OSA Firmware V5.51 Non ELEM Driver / Update 13.72 MB
AR-M620 (serv.man86) ARM550 620 700 OSA Firmware V5.51 ELEM Driver / Update 13.73 MB
AR-M620 (serv.man87) Firmware Oct 2006 Elem with P19 Driver / Update 13.13 MB
AR-M620 (serv.man88) Firmware Oct 2006 Non Elem with P19 Driver / Update 13.13 MB
AR-M620 (serv.man89) Firmware Update Oct 2006 elem Models Driver / Update 13.13 MB
AR-M620 (serv.man90) Rom Control No F00 - For U version models fitted with AR-P19 - Elem type firmware.(Main up to Vp4.04, Boot up to VM5.33A, PCU up to V03.11. Upgrade Utility and change details enclosed. Driver / Update 13.31 MB
AR-M620 (serv.man91) For U version models fitted with AR-P19 - Non-Elem type firmware.(Main up to Vp4.04, Boot up to VM5.33A, PCU up to V03.11. Upgrade Utility and change details enclosed. Driver / Update 13.3 MB
AR-M620 (serv.man92) For U version models (no P19 fitted) - Elem type firmware.(Main up to Vu4.04, Boot up to VM5.33A, PCU up to V03.11. Change details enclosed. Driver / Update 10.78 MB
AR-M620 (serv.man93) For U version models (no P19 fitted) - Non-Elem type firmware.(Main up to Vu4.04, Boot up to VM5.33A, PCU up to V03.11. Change details enclosed. Driver / Update 10.77 MB
AR-M620 (serv.man94) Common PC Fax Driver (v2.3.0.110) for Andromeda, Pegasus E, Tiger, Jupiter and Dragon Products. Driver / Update 16.61 MB
AR-M620 (serv.man95) ARM550 M620 M700 P19 firmware, ROM control F01 V4p.03, includes updated PCU (v03.10) and SCN (v02.10) for machine installed with ARP19. Improvement of initial low density and halftone density. Please read tech bulletins 048 and 049 (ARM550 M620), 030 and 031 (ARM700) or 007 (ARP19) for more details. Driver / Update 13.09 MB
AR-M620 (serv.man96) ARM550 M620 M700 firmware, ROM control no. F01 Vu4.03, includes updated PCU (v03.10) and SCN (v02.10), only for 'U'version machines. Improvement of initial low denity and halftone density. Please read tech bulletins 048 (ARM550 M620) or 030 (ARM700) for more details. Driver / Update 10.56 MB
AR-M620 (serv.man97) ARM550 620 700U firmware vp4a.03 when an ARP19 is installed, compatible for halftone image quality and Batch Printing. Driver / Update 13.22 MB
AR-M620 (serv.man98) ARM550 620 700U firmware vp4.03 when an ARP19 is installed, compatible for halftone image quality. Driver / Update 13.2 MB
AR-M620 (serv.man99) ARM550 620 700U firmware vu4.03 when an ARP19 is NOT installed, compatible for halftone image quality. Driver / Update 10.67 MB
AR-M620 (serv.man100) ARM550 620 700U firmware vu4.00, when an ARP19 is NOT installed. Driver / Update 10.61 MB
AR-M620 (serv.man101) ARM550 620 700U firmware vp4.00, to be installed when an ARP19 is fitted. Driver / Update 13.13 MB
AR-M620 (serv.man102) ARM550 ARM620 ARM700 Firmware Update Tool. Driver / Update 113.84 KB
AR-M620 (serv.man2) Handy Guide ARM550 620 700 Feb2005 Handy Guide 48 535.54 KB
AR-M620 (serv.man70) Commands for selection of paper input and output trays. Including Escape codes, PJL commands and Postscript commands. FAQ 66 274.11 KB
AR-M620 (serv.man71) Aid to help fault find paper misfeeds. This flash animation describes paper feed sections in all units, main body, ARF16, ARCF2, ARLC6. FAQ 1.89 MB
AR-M620 (serv.man192) ARM620 MSDS sheet Regulatory Data 4 29.23 KB
AR-M620 (serv.man193) ARM620 Safety Sheet Regulatory Data 2 44.53 KB
AR-M620 (serv.man194) AR620ND_DV MSDS (F-31221) Regulatory Data 4 29.19 KB

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