Ricoh biz406 Service Manual
G026/G036
SERVICE MANUAL
IMPORTANT SAFETY NOTICES
PREVENTION OF PHYSICAL INJURY
1. Before disassembling or assembling parts of the machine and peripherals,
make sure that the machine power cord is unplugged.
2. The wall outlet should be near the machine and easily accessible.
3. If any adjustment or operation check has to be made with exterior covers
off or open while the main switch is turned on, keep hands away from
electrified or mechanically driven components.
4. If the print job process is started (the PC Interface LED lit) before the
machine completes the warm-up or initialising period, keep hands away
from the mechanical and electrical components because the machine
starts making prints as soon as the warm-up period is completed.
5. The inside and the metal parts of the fusing unit become extremely hot
while the printer is operating. Be careful to avoid touching those
components with your bare hands.
HEALTH SAFETY CONDITIONS
1. Toner is non-toxic, but if you get it in your eyes by accident, it may cause
temporary eye discomfort. Try to remove with eye drops or flush with
water as first aid. If unsuccessful, get medical attention.
SAFETY AND ECOLOGICAL NOTES FOR DISPOSAL
1. Do not incinerate toner cassette. Toner dust may ignite suddenly when
exposed to an open flame.
2. Dispose of used toner cassette in accordance with local regulations. (It is
non-toxic supply.)
3. Dispose of replaced parts in accordance with local regulations.
LASER SAFETY
The Center for Devices and Radiological Health (CDRH) prohibits the repair
of laser-based optical units in the field. The optical housing unit can only be
repaired in a factory or at a location with the requisite equipment. The laser
subsystem is replaceable in the field by a qualified Customer Engineer. The
laser chassis is not repairable in the field. Customer engineers are therefore
directed to return all chassis and laser subsystems to the factory or service
depot when replacement of the optical subsystem is required.
WARNING
Use of controls, or adjustment, or performance of procedures other than
those specified in this manual may result in hazardous radiation
exposure.
WARNING FOR LASER UNIT
This machine contains a laser beam generator. Laser beams can cause
permanent eye damage. Do not open the laser unit or look along the
laser beam path while the main power is on.
CAUTION MARKINGS:
G025C501.WMF
CAUTION FOR LITHIUM BATTERY (MEMORY BACK-UP)
The danger of explosion exists if a battery of this type is incorrectly
replaced. Replace only with the same or an equivalent type
recommended by the manufacturer. Discard used batteries in
accordance with the manufacture’s instructions.
G025C503.WMF
G025C502.WMF
Trademarks
Microsoft, Windows, and MS-DOS are registered trademarks of Microsoft
Corporation.
General Notice:
Other product names used herein are for identification purpose only and may
be trademarks of their respective companies. We disclaim any and all rights
in those marks.
TABLE OF CONTENTS
1. OVERALL MACHINE INFORMATION..........................................1-1
1.1 SPECIFICATIONS.................................................................................... 1-1
1.2 FEATURES............................................................................................... 1-3
1.3 COMPONENT LAYOUT ........................................................................... 1-5
1.3.1 MECHANICAL COMPONENTS.......................................................1-5
1.3.2 ELECTRICAL COMPONENTS ........................................................ 1-7
1.3.3 OPTIONAL PAPER FEED UNIT...................................................... 1-9
1.4 OVERALL MACHINE CONTROL ........................................................... 1-10
1.4.1 CONTROL BOARD........................................................................ 1-11
Overall................................................................................................ 1-11
Functions............................................................................................ 1-11
Components....................................................................................... 1-12
1.4.2 MCB (MECHANICAL CONTROL BOARD).................................... 1-13
Overall................................................................................................ 1-13
Functions............................................................................................ 1-13
Contents............................................................................................. 1-13
1.4.3 SCB (SCANNER CONTROL BOARD)........................................... 1-14
Overall................................................................................................ 1-14
Functions............................................................................................ 1-14
Contents............................................................................................. 1-14
1.5 VIDEO DATA PATH................................................................................ 1-15
1.5.1 COPYING ...................................................................................... 1-15
1.5.2 PC PRINTING................................................................................ 1-16
1.6 POWER DISTRIBUTION........................................................................ 1-17
2. DETAILED SECTION DESCRIPTIONS .........................................2-1
2.1 SCANNING...............................................................................................2-1
2.1.1 OVERVIEW...................................................................................... 2-1
2.1.2 CCD UNIT DRIVE............................................................................ 2-2
Book Scanning..................................................................................... 2-3
ADF Scanning...................................................................................... 2-3
2.1.3 ADF (G036 ONLY)........................................................................... 2-4
OVERVIEW.......................................................................................... 2-4
JAM CONDITION.................................................................................2-5
2.2 PRINTING................................................................................................. 2-6
2.2.1 PRINTING PROCESSES AROUND THE DRUM ............................ 2-6
2.2.2 CHARGE.......................................................................................... 2-7
2.2.3 LASER EXPOSURE ........................................................................ 2-8
OVERVIEW.......................................................................................... 2-8
BLOCK DIAGRAM ............................................................................... 2-9
ERROR CONDITIONS......................................................................... 2-9
2.2.4 DEVELOPMENT............................................................................2-10
OVERVIEW........................................................................................ 2-10
TONER END DETECTION ................................................................ 2-12
i
2.2.5 TRANSFER AND SEPARATION................................................... 2-14
OVERVIEW........................................................................................ 2-14
CLEANING MODE............................................................................. 2-14
2.2.6 DRUM CLEANING.........................................................................2-15
2.2.7 PAPER FEED AND REGESTRATION........................................... 2-16
OVERVIEW........................................................................................ 2-16
PAPER FEED MECHANISM.............................................................. 2-17
REGISTRATION ................................................................................ 2-20
PAPER WIDTH AND PAPER END DETECTION............................... 2-21
JAM DETECTION .............................................................................. 2-22
2.2.8 FUSING ......................................................................................... 2-23
OVERVIEW........................................................................................ 2-23
POWER SAVE CONTROL................................................................. 2-24
2.2.9 COVER SWITCH........................................................................... 2-26
2.2.10 PAPER FEED DRIVE RELEASE AND
FUSING DRIVE RELEASE.......................................................... 2-27
2.2.11 OPTIONAL PAPER FEED UNIT..................................................2-28
Overview............................................................................................ 2-28
Paper Feed Mechanism..................................................................... 2-29
Optional Paper Feed Unit Detection................................................... 2-30
Paper Tray, Paper Size and Paper End Detection.............................2-30
Paper Feed Selection......................................................................... 2-30
Jam Detection.................................................................................... 2-30
3. INSTALLATION..............................................................................3-1
3.1 INSTALLING THE MACHINE ................................................................... 3-1
3.2 INSTALLING OPTIONAL UNITS.............................................................. 3-1
3.3 MINIMUM SPACE REQUIREMENTS.......................................................3-2
4. SERVICE TABLES AND PROCEDURES.....................................4-1
4.1 SERVICE FUNCTIONS ............................................................................ 4-1
4.1.1 ENTERING AND EXITING USER AND SERVICE MODES............. 4-1
USER MODE........................................................................................ 4-1
SERVICE MODE.................................................................................. 4-1
4.1.2 SELECTING A SERVICE MODE.....................................................4-2
4.1.3 PAPER SIZE REGISTRATION........................................................ 4-2
UPPER TRAY PAPER SIZE REGISTRATION..................................... 4-2
LOWER TRAY (OPTION) PAPER SIZE REGISTRATION................... 4-3
4.1.4 LANGUAGE SELECTION................................................................ 4-3
4.1.5 USER PARAMETER (BIT SWITCH) PROGRAMMING................... 4-4
4.1.6 RAM CLEAR [FUNCTION 74].......................................................... 4-5
4.1.7 SYSTEM PARAMER LIST [FUNCTION 81]..................................... 4-5
Details of the system parameter list..................................................... 4-6
4.1.8 RAM DISPLAY/REWRITE [FUNCTION 82].....................................4-7
HEXADECIMAL MODE........................................................................ 4-7
BINARY MODE.................................................................................... 4-8
4.1.9 RAM DUMP [FUNCTION 83]........................................................... 4-9
4.1.10 RAM TEST [FUNCTION 91] ........................................................ 4-10
4.1.11 KEY TEST [FUNCTION 92]......................................................... 4-11
ii
LED TEST [FUNCTION 93]................................................................ 4-12
4.1.13 LCD TEST [FUNCTION 94]......................................................... 4-13
4.2 BIT SWITCHES ...................................................................................... 4-14
4.2.1 FUNCTION SWITCH PARAMETERS (SWFUNC)......................... 4-14
4.2.2 USER SWITCH PARAMETERS (SWUSER)................................. 4-14
4.2.3 COUNTRY CODE.......................................................................... 4-15
4.2.4 SERVICE SWITCH PARAMETERS (SWSERV)............................ 4-16
4.2.5 COUNTRY SWITCH PARAMETERS (SWCNTRY)....................... 4-17
5. PREVENTIVE MAINTENANCE.....................................................5-1
5.1 MAINTENANCE ITEMS AND METHODS................................................. 5-1
6. REPLACEMENT AND ADJUSTMENT ...........................................6-1
6.1 EXTERIOR................................................................................................ 6-1
6.1.1 UPPER COVER REMOVAL............................................................. 6-1
6.1.2 RIGHT COVER REMOVAL.............................................................. 6-6
6.1.3 UPPER UNIT REMOVAL................................................................. 6-7
6.2 OPTICS .................................................................................................... 6-9
6.2.1 ADF UNIT REMOVAL (G036 MODEL)............................................ 6-9
6.2.2 CCD UNIT REMOVAL ................................................................... 6-10
6.2.3 LASER UNIT REMOVAL ............................................................... 6-11
6.1.4 CCD DRIVE MOTOR REMOVAL................................................... 6-15
6.3 PAPER FEED......................................................................................... 6-16
6.3.1 PAPER FEED ROLLER REMOVAL............................................... 6-16
6.3.2 PAPER PICK-UP SOLENOID REMOVAL ..................................... 6-21
6.4 OPTIONAL PAPER FEED UNIT............................................................. 6-22
6.4.1 PAPER FEED TRAY MOTOR AND SOLENOID REMOVAL......... 6-22
6.4.2 PAPER PICK-UP ROLLER REMOVAL.......................................... 6-25
6.5 FUSING.................................................................................................. 6-26
6.5.1 FUSING UNIT REMOVAL.............................................................. 6-26
6.5.2 FUSING PRESSURE ROLLER REMOVAL................................... 6-28
6.5.3 FUSING HOT ROLLER AND LAMP REMOVAL............................6-29
6.5.4 HOT ROLLER STRIPPER PAWL REMOVAL................................ 6-30
6.5.5 FUSING THERMOFUSE REMOVAL............................................. 6-31
6.5.6 FUSING THERMISTOR REMOVAL .............................................. 6-32
6.6 OTHERS................................................................................................. 6-33
6.6.1 MAIN MOTOR REMOVAL ............................................................. 6-33
6.6.2 TRANSFER ROLLER REMOVAL..................................................6-37
6.6.3 LOWER UNIT SHELL REMOVAL.................................................. 6-38
6.6.4 CONTROL BOARD AND
SCANER CONTOROL BOARD REMOVAL................................... 6-42
6.6.5 MECHANICAL CONTROL BOARD REMOVAL.............................6-45
6.6.6 POWER SUPPLY UNIT REMOVAL............................................... 6-46
6.6.7 POLYGON MIRROR MOTOR AND
LASER DIODE UNIT REMOVAL................................................... 6-47
6.7 ADJUSTMENT........................................................................................ 6-48
6.7.1 REGISTRATION ADJUSTMENT................................................... 6-48
Adjustment Standard:......................................................................... 6-48
Adjustment Tool:................................................................................ 6-48
iii
Procedure:.......................................................................................... 6-48
6.7.2 READ START TIMING (FLATBED) AND
CARRIAGE STOP POSITION (ADF) ADJUSTMENT....................6-50
Adjustment Standard:......................................................................... 6-50
Adjustment Tool:................................................................................ 6-50
Procedure:.......................................................................................... 6-50
6.7.3 READ START POINT OF HORIZONTAL
SCANNING ADJUSTMENT (FLATBED AND ADF).......................6-52
Adjustment Standard:......................................................................... 6-52
Adjustment Tool:................................................................................ 6-52
Procedure:.......................................................................................... 6-52
6.7.4 FIRMWARE UPDATING................................................................6-54
Tool:................................................................................................... 6-54
Procedure:.......................................................................................... 6-54
6.8 CONNECTOR LAYOUT ......................................................................... 6-56
6.8.1 MECHANICAL CONTROL BOARD ............................................... 6-56
CONTROL BOARD............................................................................6-56
6.8.3 SCANNER CONTROL BOARD (G036 MODEL) ........................... 6-57
POWER SUPPLY UNIT..................................................................... 6-57
7. TROUBLESHOOTING...................................................................7-1
7.1 COPY QUALITY TROUBLESHOOTING .................................................. 7-1
7.1.1 BLANK COPIES............................................................................... 7-2
7.1.2 BLACK COPIES............................................................................... 7-4
7.1.3 DIRTY BACKGROUND.................................................................... 7-5
7.1.4 UNEVEN IMAGE DENSITY............................................................. 7-6
7.1.5 VERTICAL BLACK LINES ............................................................... 7-7
7.1.6 HORIZONTAL BLACK LINES.......................................................... 7-8
7.1.7 VERTICAL WHITE LINES................................................................ 7-9
7.1.8 HORIZONTAL WHITE LINES........................................................ 7-10
7.1.9 BLACK DOTS/SPOTS................................................................... 7-11
7.1.10 WHITE SPOTS IN BLACK IMAGE AREAS.................................. 7-12
7.1.11 FAINT COPIES............................................................................ 7-13
7.1.12 VERTICAL BLACK STREAKS..................................................... 7-14
7.1.13 UNFUSED COPIES..................................................................... 7-15
7.1.14 GHOST IMAGE............................................................................ 7-15
7.1.15 TONER ON THE BACK OF THE PRINT PAPER ........................ 7-16
7.1.16 MISALIGNED OUTPUT
(IMAGE SHIFTED TO THE RIGHT OR LEFT) ............................ 7-17
7.1.17 MISALIGNED OUTPUT
(IMAGE SHIFTED VERTICALLY)/SHRUNKEN IMAGE .............. 7-17
7.2 MECHANICAL PROBLEMS.................................................................... 7-18
7.2.1 ADF NON FEED (G036 ONLY) ..................................................... 7-18
7.2.2 ADF JAM (G036 ONLY)................................................................. 7-19
7.2.3 ADF SKEW (G036 ONLY) ............................................................. 7-20
7.2.4 ADF MULTI-FEED (G036 ONLY) .................................................. 7-20
7.2.5 SCANNER HOME POSITION ERROR (ERROR CODE 90)......... 7-21
7.2.6 PAPER NON-FEED (PRINTER).................................................... 7-21
7.2.7 PAPER JAM (REGISTRATION AREA).......................................... 7-22
iv
7.2.8 PAPER JAM (FUSING EXIT AREA).............................................. 7-23
7.2.9 PAPER SKEW (PRINTER)............................................................ 7-24
7.2.10 PAPER MULTI-FEED (PRINTER) ............................................... 7-24
7.3 ERROR CODES..................................................................................... 7-25
Fatal error........................................................................................... 7-25
Semi fatal error................................................................................... 7-25
v
26 August 1998 SPECIFICATIONS
1. OVERALL MACHINE INFORMATION
1.1 SPECIFICATIONS
Type Copier/Printer
G026: Flatbed scanner, Copier, PC Printer
G036: Flatbed scanner, ADF, Copier, PC
Printer
Document Size Flatbed Scanner
Width: Within 216 mm [8.5"]
Length: Within 355.6 mm [14"]
ADF (G036 only)
Width: 91 mm - 216 mm [3.6" - 8.5"]
Length: 140 mm - 355.6 mm [5.5" - 14"]
Document Weight: Equivalent to 60 g/m² - 90 g/m²
(0.05 mm to 0.2 mm [2 mils to 8 mils])
Document Feed Face down
ADF Capacity 10 sheets
Scanning Method CCD unit (including LED array)
Overall
Information
Scan Resolution Main scan: 300 dpi
Sub scan: 150 - 600 dpi
(Depends on reduction/enlargement ratio)
Printing System Laser printing, plain paper, dry toner
Print Speed Copier: 6 cpm
Printer: 6 ppm
Paper Size Upper Paper Tray
Width: 91 mm - 216 mm [3.6" - 8.5"]
Length: 140 mm - 355.6 mm [5.5" - 14"]
Lower Paper Tray (Option)
A4, 8½" x 11"
Paper Capacity Upper Paper Tray: 100 sheets (Plain paper)
Lower Paper Tray (Option): 250 sheets (Plain paper)
Printer Resolution 600 dpi x 600 dpi
(Enhanced 1200 dpi x 600 dpi with smoothing in the
PC print mode)
1-1
SPECIFICATIONS 26 August 1998
PC Connection PC: PC/AT Compatible
Interface: IEEE-1284
PDL: PCL5e Compatible
Power Supply AC 120 V 60 Hz
AC 220 V - 240 V 50 Hz/60 Hz
Power Consumption
(without optional paper
feed unit)
Standby (Pre heating mode):
120 V: 75 W (Normal) 300 W (Maximum)
220 V: 75 W (Normal) 255 W (Maximum)
240 V: 75 W (Normal) 280 W (Maximum)
Standby (Sleep mode):
120 V: 14.0 W (Normal) 15.0 W (Maximum)
220 V: 14.5 W (Normal) 15.0 W (Maximum)
240 V: 14.7 W (Normal) 15.0 W (Maximum)
Copying:
120 V: 240 W (Normal) 540 W (Maximum)
220 V: 240 W (Normal) 480 W (Maximum)
240 V: 240 W (Normal) 540 W (Maximum)
Printing:
120 V: 210 W (Normal) 530 W (Maximum)
220 V: 215 W (Normal) 470 W (Maximum)
240 V: 215 W (Normal) 530 W (Maximum)
Operating Environment Temperature: 10ºC - 35ºC [50ºF - 95ºF]
Humidity: 15% - 80%
Recommended
Environment
Temperature: 15ºC - 25ºC [59ºF - 77ºF]
Humidity: 30% - 70%
Dimensions
(W x D x H)
Main Unit:
G026: 352 mm x 576 mm x 249 mm
(13.9" x 22.7" x 9.8")
G036: 352 mm x 576 mm x 297 mm
(13.9" x 22.7" x 11.7")
(Excluding trays and optional unit)
Optional Paper Feed Unit
332 mm x 523 mm x 79 mm
(13.1" x 20.6" x 3.1")
Weight G026: 15.0 kg [33.0 lb]
G036: 15.5 kg [34.1 lb]
(Including toner cassette)
Optional Paper Feed Unit
2.8 kg [6.2 lb]
1-2
26 August 1998 FEATURES
1.2 FEATURES
Equipment
Features G026 G036
ADF Flatbed Scanner
Paper Feed Unit option option
Software Counter
Parallel Interface
Second Printer Interface
Video Processing Features
Features G026 G036
Auto Image Density Control
Halftone (Dithering & Error diffusion)
Resolution
Smoothing
Overall
Information
Copier Features
Features G026 G036
Auto Image Density
Photo Mode
Reduction/Enlargement
Zoom
Electronic Sorting Memory Copy
Other User Features
Features G026 G036
Language Selection
Multi-copy Mode (up to 99)
Power Saver Mode (standby mode)
Toner Saving Mode
User Parameters
1-3
FEATURES 26 August 1998
Service Mode Features
Features G026 G036
Country Code
Operation Panel Test (Key)
Operation Panel Test (LED)
Operation Panel Test (LCD)
RAM Clear
RAM Display/Rewrite
RAM Dump
RAM Test
System Parameter List
1-4
26 August 1998 COMPONENT LAYOUT
1.3 COMPONENT LAYOUT
1.3.1 MECHANICAL COMPONENTS
1 2 3 4 5
6
7
Overall
Information
G025D001.WMF
1415
No. Name Description
1 Exposure Glass Original is placed here for scanning.
2 Pick-up Roller (G036 only) Picks up pages of the document from the document
table one at a time.
3 Separation Tab (G036
only)
4 Document Feed Roller
(G036 only)
5 Document Feed-in Roller
(G036 only)
6 Document Feed-out Roller
(G036 only)
7 CCD Unit Contains the CCD and LED array.
8 Laser Unit Consists of the laser diode unit, cylindrical lens, f-
9 Upper Tray Bottom Plate Presses paper stacked in the upper paper tray
10 Paper Feed Roller Picks up the top sheet of paper fr om t he stack in
11 Toner Cassette Consists of the OPC drum, t oner , toner application
Prevents more than one sheet from feeding into the
scanner.
Feeds the document to the document f eed- in r oller .
Feeds the document through the scanning ar ea.
Feeds the document out from the scanning area.
theta lens, polygon mirror motor , and ot her laser
optical components.
against the paper feed roller.
the upper paper tray and feeds it into the transfer
area.
roller, development roller, charg e br ush roller,
cleaning blade, and other development components.
1089111213
1-5
COMPONENT LAYOUT 26 August 1998
No. Name Description
12 Transfer Roller Applies a charge to the paper to pull the toner off the
drum and onto the copy paper.
13 Pressure Roller Applies pressure to the paper during fusing.
14 Hot Roller Fuses the toner to the copy paper.
15 Paper Exit Roller Feeds the paper out of the printer .
1-6
26 August 1998 COMPONENT LAYOUT
1.3.2 ELECTRICAL COMPONENTS
6 7 8 9 10
5
11
17
18 19 20 21 22
4
3
16
2
15
1
12
No. Name Description
1 Toner End Sensor This detects when the toner has run out.
2 Paper Width Sensor This detects whether the paper in the upper paper
3 Platen Cover Switch
(G036 only)
4 Paper End Sensor This detects when the paper in the upper paper tray
5 Main Motor This dc motor drives the toner cassette, paper feed
6 Home Position Sensor This detects when the CCD unit is at the home
7 Document Sensor (G036
only)
8 ADF Registration Sensor
(G036 only)
9 ADF Motor (G036 only) This stepper motor drives the ADF mechanism .
10 Paper Pick-up Solenoid This releases the cam stopper to pick up a sheet of
11 Operation Panel This board controls the operation panel.
12 Scanner Motor This stepper motor drives the book scanner.
13 Fan Motor This blows hot air out of the machine.
14 Control Board This board controls the m achine.
15 Scanner Control Board
(SCB)
16 Mechanical Control
Board (MCB)
G025V502.WMF
14 24
13
tray is wider than 203 millimeters or not.
This detects when the platen cover is opened.
has run out.
mechanism, and fusing unit.
position.
This detects the presence of a document in the
feeder.
This detects when the document has reached the
registration sensor.
paper.
This board controls the scanner components.
This board controls the printer component s.
G025V503.WMF
Overall
Information
23
1-7
COMPONENT LAYOUT 26 August 1998
No. Name Description
17 CCD Unit This includes the CCD and LED array. The CCD
reads and converts the light reflect ed from the
document into an analog video signal. The LED
array illuminates the document.
18 Power Supply Unit (PSU) This board supplies power to the machine.
19 Paper Registration
Sensor
20 Paper Exit Sensor This detects when the paper has been fed out of the
21 Interlock Switch If the upper cover is open, this interlock switch cuts
22 Thermofuse This interrupts the ac power supply to the fusing
23 Fusing Lamp This fuses the toner to the paper.
24 Thermistor This monitors the temperat ur e inside the fusing unit.
This detects when the paper has reached the
registration sensor.
fusing unit
the +5VLD power supply for the laser diode and the
+24V power supply for the fan motor, polygonal
mirror motor, main motor , and other components.
lamp if the temperature of the thermostat surface
exceeds 250°C.
1-8
26 August 1998 COMPONENT LAYOUT
1.3.3 OPTIONAL PAPER FEED UNIT
1
2
3
54
6
7
G025V504.WMF
No. Name Description
1 Paper Feed Unit
Control Board
2 Paper Tray Sensor This detects whether the lower paper tray is set
3 Paper Feed Motor This motor drives the paper pick-up roller and paper
4 Paper Feed Roller This feeds paper from the lower paper tray into the
5 Paper Pick-up Roller This picks up t he t op sheet of paper from the stack in
6 Paper Feed Solenoid This controls the paper feed clutch.
7 Paper End Sensor This detects when paper in the opt ional paper feed unit
This board receives power and control signals from t he
mechanical control board. This board drives the motor
and solenoid in the optional paper feed unit.
correctly.
feed roller.
machine.
the lower paper tray and feeds it to the paper feed
roller.
has run out.
Overall
Information
1-9
OVERALL MACHINE CONTROL 26 August 1998
1.4 OVERALL MACHINE CONTROL
G025V705.WMF
This machine contains a control board, mechanical control board (MCB), scanner
control board (SCB), and power supply unit (PSU).
The control board controls the system and interfaces with the SCB, MCB, and PC.
The MCB controls devices related to the printer port, and the optional paper feed
unit. It also has an onboard power pack which generates high voltage supplies
necessary for the printing process.
The SCB controls devices related to the scanner.
The PSU generates dc +24 volts, +5 volts and -5 volts and supplies them to the
boards. It also supplies ac power to the fusing lamp.
1-10
26 August 1998 OVERALL MACHINE CONTROL
1.4.1 CONTROL BOARD
G025V706.WMF
Overall
Information
Overall
The control board controls the machine with the assistance of the mechanical
control board (MCB) and scanner control board (SCB). It contains a Xipchip, PLD,
flash ROM, EEPROM, DRAM, IEEE1284 connector, driver and analog switch. The
DRAM is plugged into a SIMM socket so that it can be changed easily by a user.
Functions
1. Scanning process control
2. Printing process control
3. Halftone image process (photo1: dithering, photo2: error diffusion)
4. Smoothing control
5. JBIG/ABIC control
6. IEEE1284 I/O port control
7. Second printer control
1-11
OVERALL MACHINE CONTROL 26 August 1998
Components
1. Xipchip
This is a multi-function peripheral controller. It functions as a CPU and an image
processor.
2. Memory
•
Flash ROM (4 MB/1 MB): For the firmware
•
EEPROM (8 KB): For individual data such as country code, factory
adjustments and so on.
•
DRAM (4 MB as standard): Working area for the Xipchip, image data,
and so on.
3. PLD
This chip functions as the interface for the SCB and MCB.
4. IEEE1284 driver
This chip is the IEEE1284 parallel interface driver.
Analog switch
This switch makes this machine function as a printer exchanger. Data for printing
passes through this switch to the second printer.
1-12
26 August 1998 OVERALL MACHINE CONTROL
1.4.2 MCB (MECHANICAL CONTROL BOARD)
Overall
Information
G025V507.WMF
Overall
The mechanical control board (MCB) controls devices related to the printer and
optional paper feed unit.
The MCB contains a CPU (H8), peripheral control gate array (GEPC), video I/F
chips, motor drivers, power pack, and on-board sensors.
Functions
1. To control the main motor, laser diode driver, polygon mirror motor, sensors,
and so on.
2. To control fusing temperature through the power supply unit (PSU).
3. To generate high voltages for development bias, charge voltage, and transfer
voltage.
4. To control the optional paper feed unit.
Contents
1. H8
This eight-bit CPU controls the MCB. It receives outputs from sensors and the
thermistor.
2. GEPC
This chip contains an I/O port and controls the main motor, laser diode driver,
polygon mirror motor, optional paper feed unit, and so on. This chip generates
the pulse width modulation signal to control the power pack.
3. Video I/F
This chip is the interface for the control board.
4. Sensors
The registration sensor and paper exit sensor are built into this board.
1-13
OVERALL MACHINE CONTROL 26 August 1998
1.4.3 SCB (SCANNER CONTROL BOARD)
G025V508.WMF
Overall
The scanner control board (SCB) controls devices related to the scanner unit and
operation panel. The SCB contains a CPU (H8), peripheral control gate array
(GSPC), image processing LSI (LC82103), motor drivers, and an IEEE1284
connector for the second printer.
Functions
1. Flatbed scanner mechanism control
2. ADF mechanism (G036 only) control
3. CCD unit control
4. Operation panel control
5. Second printer interface
Contents
1. H8
This eight-bit CPU controls the SCB. It receives output from sensors.
2. GEPC
This chip contains an I/O port and it controls scanner motor, ADF motor (G036
only), CCD unit, and LCD display.
3. LC82103
This chip is an image processing LSI. It converts the analog signal from the
CCD unit to a digital signal.
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26 August 1998 VIDEO DATA PATH
1.5 VIDEO DATA PATH
1.5.1 COPYING
Overall
Information
G025V510.WMF
The CCD generates an analog video signal from the light reflected from the
original.
The scanned data passes to the scanner control board (SCB). The SCB converts
scanned video data from the analog signal to a digital signal. Then the data passes
to the control board. The control board does digital video data processing, such as
halftone (dither/error diffusion), reduction/enlargement, and smoothing. Then it
stores the processed data in the page memory. The processed data passes to the
mechanical control board (MCB). The MCB drives the laser diode based on the
processed data signal. Then, the laser beam writes a latent image on the drum.
1-15
VIDEO DATA PATH 26 August 1998
1.5.2 PC PRINTING
G025V511.WMF
Data from the PC passes to the control board through the IEEE1284 driver. If the
analog switch is changed over the second printer by pressing the second printer
key on the operation panel, the video data passes to the second printer.
The control board does digital video data processing such as halftone (dither/error
diffusion), reduction/enlargement, and smoothing. Then it stores the processed
data in the page memory. The processed data passes to the mechanical control
board (MCB).
The MCB drives laser diode based on the processed data signal. Then, the laser
beam writes a latent image on the drum.
1-16
26 August 1998 POWER DI STRIBUTION
1.6 POWER DISTRIBUTION
Overall
Information
G025V709.WMF
The power supply unit (PSU) supplies +24 volts, +5 volts, and -5 volts dc power to
the mechanical control board (MCB). The MCB generates +5 volts from the +24
volts for the laser diode driver, and it also generates high voltage power for
development bias, charge voltage, and transfer voltage. The control board
generates +3.3 volts from the +5 volts supply, which is used internally. The
scanner control board (SCB) generates +9 volts from the +24 volts supply, which is
used internally.
The MCB contains an interlock switch, which is opened by opening the upper
cover. If this switch is opened, the +24 volt dc power is cut and the power to the
following devices is shut off.
•
Power pack
•
Main motor, fan motor, polygon mirror motor
•
Laser diode driver
•
Fusing lamp
•
Paper pick-up solenoid
•
Optional paper feed unit
1-17
26 August 1998 SCANNING
2. DETAILED SECTION DESCRIPTIONS
2.1 SCANNING
2.1.1 OVERVIEW
[A]
[D]
The CCD unit [A] consists of an LED array [B], 3 mirrors, a lens [C], and a CCD [D].
During a copy cycle, the light from the LED array is reflected off the original, and
then is transferred onto the CCD via 3 mirrors and a lens.
[B][C]
G025D501.WMF
Detailed
Descriptions
The CCD unit moves under the exposure glass to scan a book original. When
scanning a sheet original using the ADF, it remains at the ADF scan line.
2-1
SCANNING 26 August 1998
2.1.2 CCD UNIT DRIVE
[A]
[C]
[B]
[E]
[D]
[F]
G025D502.WMF
A stepper motor [A] is used to drive the CCD unit [B]. The motor drives the CCD
unit through the timing belt [C] and the drive belt [D]. The CCD unit moves along
the guide rail [E].
The home position sensor [F] detects when the CCD unit is at the home position.
The motor speed depends on the selected reduction or enlargement ratio.
When the machine is turned on, it checks the home position sensor. If home
position sensor is on, the CCD unit is at the home position. If home position sensor
is off, the machine moves the CCD unit until the home position sensor turns on.
[H]
[J][K]
[G]
G025D503.WMF
At the start of scanning, the CCD unit moves from the home position sensor [G] to
the left until the scanner position sensor turns off and then moves in the opposite
direction until the home position sensor turns back on. After that, the CCD unit
moves from the home position to a position under the white shading strip [H] to
adjust shading. At that time, the LED array is turned on.
2-2
26 August 1998 SCANNING
Book Scanning
After shading, the CCD unit stops temporarily at the reading standby position [J]
while the scan parameters (X/Y coordinates) are initialized. Then, it scans across
the original. Scanning speed depends on the reproduction ratio. Full size (100%)
scanning speed is 38 mm/s. Shading is done before scanning each page.
ADF Scanning
After shading, the scanner moves to the ADF scanning position [K] and stays there
while documents are fed through the ADF. Shading is done only once before
scanning.
Detailed
Descriptions
2-3
SCANNING 26 August 1998
2.1.3 ADF (G036 ONLY)
OVERVIEW
[J]
[F]
[H]
[G]
G025D504.WMF
[B]
[C]
[E]
[D]
[A]
The sheet-through type ADF feeds documents from the bottom page of the
document stack on the ADF table. During scanning the document moves past the
CCD unit, which is locked in position.
The document sensor [A] detects documents set on the table.
Before the start of scanning, the CCD unit moves to the ADF scanning position.
The pick-up roller [B] and feed roller [C] feed the document into the ADF unit. Only
the bottom sheet is fed because the separation tab [D] prevents any other sheets
from feeding. The document feed-in roller [E] feeds the document through the ADF
unit. The document feed speed depends on the reproduction ratio. For 100%
copies, the feeding speed is 38 mm/s.
The pressure plate [F] presses the document to the exposure glass through the
mylar guide [G] at the scan line, so that the document is within the CCD unit’s
range of focus.
After the document passes the scanning position, the feed-out roller [H] feeds it
onto the document exit tray. When scanning is finished, the CCD unit moves back
to the home position.
The registration sensor [J] detects the lead ing edge and the trailing edge of the
document, and it is also used to detect document jam.
2-4
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