Ricoh Bizworks 106 User manual

G025/G027
SERVICE MANUAL

øIMPORTANT 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.
øWARNING
Use of controls, or adjustment, or performance of procedures other than
those specified in this manual may result in hazardous radiation exposure.
øWARNING
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:
øWARNING
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.
LASER_PS4.WMF
LASER_PS1.WMF
LASER_PS4.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.

1
TABLE OF CONTENTS
1. OVERALL MACHINE INFORMATION........................................1-1
1.1 SPECIFICATIONS.................................................................................... 1-1
1.2 FEATURES............................................................................................... 1-4
1.3 COMPONENT LAYOUT........................................................................... 1-7
1.3.1 MECHANICAL COMPONENTS....................................................... 1-7
1.3.2 ELECTRICAL COMPONENTS........................................................ 1-9
1.4 OVERALL MACHINE CONTROL........................................................... 1-11
1.5 VIDEO DATA PATH ............................................................................... 1-12
1.5.1 COPYING ...................................................................................... 1-12
1.5.2 PC PRINTING................................................................................ 1-13
1.5.3 PC SCANNING.............................................................................. 1-14
1.5.4 TRANSMISSION............................................................................ 1-15
1.5.5 RECEPTION.................................................................................. 1-16
1.6 POWER DISTRIBUTION........................................................................ 1-17
2. DETAILED SECTION DESCRIPTIONS.......................................2-1
2.1 SCANNING............................................................................................... 2-1
2.1.1 OVERVIEW (G027 ONLY)............................................................... 2-1
2.1.2 CCD UNIT DRIVE (G027 ONLY)..................................................... 2-2
Book Scanning..................................................................................... 2-3
ADF Scanning...................................................................................... 2-3
2.1.3 AUTO DOCUMENT FEEDER (ADF)............................................... 2-4
Overview.............................................................................................. 2-4
Platen Cover Switch (G027 only)......................................................... 2-5
Jam Conditions .................................................................................... 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
2.2.5 TRANSFER AND SEPARATION................................................... 2-14
Overview............................................................................................ 2-14
Cleaning Mode................................................................................... 2-14
2.2.6 DRUM CLEANING......................................................................... 2-15

2
2.2.7 PAPER FEED AND REGISTRATION............................................ 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 PAPER EXIT CHANGE MECHANISM (G025 ONLY).................. 2-29
2.3 PCBS...................................................................................................... 2-30
2.3.1 CONTROL BOARD........................................................................ 2-30
Overall................................................................................................ 2-30
Functions ........................................................................................... 2-30
Components....................................................................................... 2-31
2.3.2 MCB (MECHANICAL CONTROL BOARD).................................... 2-32
Overall................................................................................................ 2-32
Functions ........................................................................................... 2-32
Contents............................................................................................. 2-32
2.3.3 SCB (SCANNER CONTROL BOARD) .......................................... 2-33
Overall................................................................................................ 2-33
Functions ........................................................................................... 2-33
Contents............................................................................................. 2-33
2.3.4 NCU (USA) .................................................................................... 2-34
Jumpers............................................................................................. 2-34
2.3.5 NCU (EUROPE/ASIA) ................................................................... 2-35
Control Signals and Jumpers............................................................. 2-35
3. INSTALLATION...........................................................................3-1
3.1 INSTALLING THE MACHINE................................................................... 3-1
3.2 MINIMUM SPACE REQUIREMENTS....................................................... 3-2
4. SERVICE TABLES AND PROCEDURES ...................................4-1
4.1 SERVICE LEVEL FUNCTIONS................................................................ 4-1
4.1.1 SERVICE LEVEL FUNCTION LIST................................................. 4-1
4.1.2 ENTERING SERVICE FUNCTION MODES.................................... 4-1
4.1.3 EXITING THE SERVICE MODE...................................................... 4-1
4.2 SERVICE FUNCTION OPERATION ........................................................ 4-2
4.2.1 USER PARAMETER (BIT SWITCH) PROGRAMMING................... 4-2
4.2.2. MODEM TEST [FUNCTION 71]....................................................... 4-3
4.2.3 DTMF TEST [FUNCTION 72] .......................................................... 4-3
4.2.4 OUTPUT LEVEL [FUNCTION 73].................................................... 4-4
4.2.5 RAM CLEAR [FUNCTION 74].......................................................... 4-4
4.2.6 SYSTEM PARAMETER LIST [FUNCTION 81]................................ 4-5
System Parameter List Details............................................................. 4-6

3
4.2.7 RAM DISPLAY/REWRITE [FUNCTION 82]..................................... 4-7
Hexadecimal Mode .............................................................................. 4-7
Binary Mode......................................................................................... 4-8
4.2.8 RAM DUMP [FUNCTION 83]........................................................... 4-9
4.2.9 RAM TEST [FUNCTION 91] .......................................................... 4-10
4.2.10 KEY TEST [FUNCTION 92]......................................................... 4-11
4.2.11 LED TEST [FUNCTION 93] ......................................................... 4-12
4.2.12 LCD TEST [FUNCTION 94]......................................................... 4-13
4.2.13 SPEAKER TEST [FUNCTION 95] ............................................... 4-13
4.3 BIT SWITCHES...................................................................................... 4-14
4.3.1 FUNCTION SWITCH PARAMETERS (SWFUNC)......................... 4-14
4.3.2 USER SWITCH PARAMETERS (SWUSER)................................. 4-17
4.3.3 COUNTRY CODE.......................................................................... 4-19
4.3.4 SERVICE SWITCH PARAMETERS (SWSERV)............................ 4-20
4.3.5 COUNTRY SWITCH PARAMETERS (SWCNTRY)....................... 4-24
4.4 NCU PARAMETERS .............................................................................. 4-29
4.5 SERVICE RAM ADDRESSES................................................................ 4-34
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 OPERATION PANEL REMOVAL (G025 ONLY).............................. 6-1
6.1.2 UPPER UNIT REMOVAL (G025 ONLY).......................................... 6-2
6.1.3 UPPER COVER REMOVAL (G027 ONLY)...................................... 6-3
6.1.4 RIGHT COVER REMOVAL.............................................................. 6-7
6.1.5 UPPER UNIT REMOVAL (G027 ONLY).......................................... 6-9
6.2 OPTICS .................................................................................................. 6-11
6.2.1 ADF UNIT REMOVAL.................................................................... 6-11
6.2.2 CCD UNIT REMOVAL................................................................... 6-13
6.2.3 LASER UNIT REMOVAL ............................................................... 6-15
6.2.4 CCD DRIVE MOTOR REMOVAL (G027 ONLY)............................ 6-22
6.3 PAPER FEED......................................................................................... 6-23
6.3.1 PAPER FEED ROLLER REMOVAL .............................................. 6-23
6.3.2 PAPER PICK-UP SOLENOID REMOVAL..................................... 6-28
6.4 FUSING.................................................................................................. 6-29
6.4.1 FUSING UNIT REMOVAL ............................................................. 6-29
6.4.2 PRESSURE ROLLER REMOVAL ................................................. 6-31
6.4.3 HOT ROLLER AND LAMP REMOVAL .......................................... 6-32
6.4.4 HOT ROLLER STRIPPER PAWL REMOVAL................................ 6-33
6.4.5 FUSING THERMOFUSE REMOVAL............................................. 6-34
6.4.6 FUSING THERMISTOR REMOVAL.............................................. 6-35
6.5 OTHERS................................................................................................. 6-36
6.5.1 MAIN MOTOR REMOVAL............................................................. 6-36
6.5.2 TRANSFER ROLLER REMOVAL.................................................. 6-39
6.5.3 LOWER UNIT SHELL REMOVAL.................................................. 6-40

4
6.5.4 CONTROL BOARD AND SCANER CONTOROL BOARD
REMOVAL..................................................................................... 6-45
6.5.5 MECHANICAL CONTROL BOARD REMOVAL............................. 6-48
6.5.6 POWER SUPPLY UNIT REMOVAL .............................................. 6-49
6.5.7 NETWORK CONTROL BOARD REMOVAL.................................. 6-50
6.6 ADJUSTMENT........................................................................................ 6-51
6.6.1 REGISTRATION ADJUSTMENT................................................... 6-51
6.6.2 READ START TIMING (FLATBED) AND CCD UNIT
STOP POSITION (ADF) ADJUSTMENT (G027 ONLY) ................ 6-53
6.6.3 READ START POINT OF HORIZONTAL SCANNING
ADJUSTMENT (FLATBED AND ADF) (G027 ONLY).................... 6-55
6.6.4 FIRMWARE UPDATING................................................................ 6-57
6.6.5 FIRMWARE RECOVERY.............................................................. 6-59
6.6.6 ADDITIONNAL MODULE UPDATE............................................... 6-62
6.7 CONNECTOR LAYOUT ......................................................................... 6-64
6.7.1 MECHANICAL CONTROL BOARD ............................................... 6-64
Control Board..................................................................................... 6-64
6.7.3 SCANNER CONTROL BOARD..................................................... 6-65
6.7.4 POWER SUPPLY UNIT................................................................. 6-65
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 PRINTOUT.............................. 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............................................................................ 7-18
7.2.2 ADF JAM ....................................................................................... 7-19
7.2.3 ADF SKEW.................................................................................... 7-20
7.2.4 ADF MULTI-FEED......................................................................... 7-20

5
7.2.5 SCANNER HOME POSITION ERROR (ERROR CODE 90)
(G027 ONLY).................................................................................. 7-21
7.2.6 PAPER NON-FEED (PRINTER).................................................... 7-21
7.2.7 PAPER JAM (REGISTRATION AREA).......................................... 7-22
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 errors......................................................................................... 7-25
Semi fatal errors................................................................................. 7-25
OPTION
PAPER FEED UNIT (G512)
1. OVERALL INFORMATION................................................... G512-1
1.1 SPECIFICATIONS..............................................................................G512-1
1.2 COMPONENT LAYOUT.....................................................................G512-1
2. DETAILED SECTION DESCRIPTIONS................................ G512-2
2.1.1 OPTIONAL PAPER FEED UNIT................................................G512-2
3. INSTALLATION.................................................................... G512-5
4. REPLACEMENT AND ADJUSTMENT................................. G512-6
4.1.1 PAPER FEED TRAY MOTOR AND SOLENOID REMOVAL.....G512-6
4.1.2 PAPER PICK-UP ROLLER REMOVAL .....................................G512-9

18 May, 1999 SPECIFICATIONS
1-1
Overall
Information
1. OVERALL MACHINE INFORMATION
1.1 SPECIFICATIONS
Type Multi-functional Product
G025: ADF Scanner, Fax, Copier, PC Printer
G027: ADF/Flatbed Scanner, Fax, Copier, PC Printer
Circuit PSTN, PABX
Connection
(G025/G027) Direct Couple
Document Size Flatbed Scanner
Width: Within 216 mm [8.5"]
Length: Within 355.6 mm [14"]
ADF
Width: 91 mm - 216 mm [3.6" - 8.5"]
Length: 140 mm - 355.6 mm [5.5" - 14"]
Up to 1200 mm [47.2”], manually assisted
Document Weight
(ADF) Equivalent to 60 g/m² - 90 g/m² (0.05 mm to 0.2 mm)
Document Feed (ADF) Face down
ADF Capacity 10 sheets
Scanning Method CCD unit (including LED array)
Scan Resolution Copy mode:
Main scan: 300 dpi
Sub-scan: 150 – 600 dpi
(Depends on reduction/enlargement ratio)
Scanner Mode
Main scan: 300 dpi
Sub-scan: 300 dpi
Fax mode
Main scan: 8 dots/mm
Sub-scan:
Standard - 3.85 lines/mm
Detail - 7.7 lines/mm
Memory Capacity ECM: 64 KB; single buffer
Protocol Group 3 with ECM
Compression MH, MR, MMR

SPECIFICATIONS 18 May, 1999
1-2
Modulation V17 (TCM), V29 (QAM), V27ter (PHM), V21 (FM)
Data Rate 14400/12000/9600/7200/4800/2400
Automatic fall-back
I/O Rate With ECM: 0 ms/line
Without ECM: 5, 10, 20 or 40 ms/line
Transmission Time ADF mode: 8 seconds
Flatbed mode: 12 seconds
Condition: 14400 bps; G3 ECM, MMR and MTF off for
an ITU-T #1 test document using standard resolution
Printing System Laser printing, plain paper, dry toner
Printing Speed Printer: 6 ppm
Copier: 6 cpm (Memory copy mode)
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)
Printer Compatibility PDL: PCL5e Compatible
PC: PC/AT Compatible
OS: Windows 3.x, 95, 98
Scanner Compatibility Twain Interface Compatible
PC: PC/AT Compatible
OS: Windows 95, 98
Interface Interface: IEEE-1284 Bi-Centronics Interface ECP
Power Supply AC 120 V 60 Hz
AC 220 V – 240 V 50 Hz/60 Hz
Power Consumption
(Average) G025 (without optional paper feed unit): Power saver mode:
220 V: 14 W 240 V: 15 W

18 May, 1999 SPECIFICATIONS
1-3
Overall
Information
Stand-by:
220 V: 51 W 240 V: 52 W
Printing:
220 V: 222 W 240 V: 221 W
Copying:
220 V: 223 W 240 V: 220 W
Fax transmitting:
220 V: 67 W 240 V: 67 W
Fax receiving:
220 V: 188 W 240 V: 197 W
Scanning:
220 V: 63 W 240 V: 63 W
G027 (without optional paper feed unit):
Power saver mode:
120 V: 14 W 220 V: 15 W 240 V: 15 W
Stand-by:
120 V: 69 W 220 V: 61 W 240 V: 62 W
Printing:
120 V: 263 W 220 V: 232 W 240 V: 229 W
Copying (ADF mode):
120 V: 252 W 220 V: 253 W 240 V: 249 W
Fax transmitting (ADF mode):
120 V: 77W 220 V: 64 W 240 V: 68 W
Fax receiving:
120V: 230 W 230 V: 229 W 240 V: 231 W
Scanning (Flatbed mode):
120 V: 68 W 220 V: 61 W 240 V: 64 W
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: G025: 337mm x 333mm x 292mm
(13.3" x 13.1" x 11.5")
G027: 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 G025: 9.5kg [20.9 lb.]
G027: 15.5kg [34.1 lb.]
(Including toner cassette)
Optional Paper Feed Unit
2.8 kg [6.2 lb.]

FEATURES 18 May, 1999
1-4
1.2 FEATURES
Equipment Features G025 G027
ADF 99
Flatbed Scanner - 9
Paper Feed Unit Option Option
Software Counter 99
Parallel Interface 99
Second Printer Interface 99
Video Processing Features
Features G025 G027
Auto Image Density Control 99
Halftone (Dithering & Error diffusion) 99
Resolution 99
Smoothing 99
Copier Features
Features G025 G027
Auto Image Density 99
Photo Mode 99
Reduction/Enlargement 99
Zoom 99
Electronic Sorting 99
Multi-copy Mode (Up to 99) 99
Memory Copy 99
PC Scanner Features
Features G025 G027
PC scanner 99
Communication Features - Auto
Features G025 G027
Automatic Fallback 99
Automatic Redialing (ADF mode only) 99
Limited Substitute Reception 99
Page Separation Mark 99

18 May, 1999 FEATURES
1-5
Overall
Information
Communication Features - User Selectable
Features G025 G027
Authorized Reception 99
Auto Dialing (pulse or DTMF) 99
Auto Image Density Selection 99
Direct Fax Number Entry 99
Immediate Redialing 99
Immediate Transmission 99
Name Dial (25 stations) 99
On Hook Dial 99
Quick Dial (5 stations) 99
Reception Modes (Fax, Tel) 99
Remote Control Features (Tel→Fax) 99
Tonal Signal Transmission 99
Communication Features - Service Selectable
Features G025 G027
Busy Tone Detection 99
ECM 99
Other User Features
Features G025 G027
Language Selection 99
Multi-copy Mode (up to 99) 99
Power Saver Mode (standby mode) 99
Toner Saving Mode 99
User Parameters 99
Clock 99
Daylight Saving Time 99
RDS on/off 99
Remaining memory indicator 99
TTI, CSI (RTI is not available) 99
Telephone line type 99
TTI on/off 99
Reports - Automatic
Features G025 G027
Error Report 99
Journal 99
Power Failure Report 99
Transmission Result Report 99
Unauthorized Call Report 99

FEATURES 18 May, 1999
1-6
Report - User-initiated
Features G025 G027
Help List 99
Journal 99
Dial List 99
Service Mode Features
Features G025 G027
Bit switch programming 99
Speaker test 99
Cable Equalizer 99
Country code 99
DTMF tone test 99
Modem test 99
Operation panel test 99
RAM display/rewrite 99
RAM dump 99
RAM test 99
Software updating 99
System parameter list 99

18 May, 1999 COMPONENT LAYOUT
1-7
Overall
Information
1.3 COMPONENT LAYOUT
1.3.1 MECHANICAL COMPONENTS
G025
No. Name Description
1 Pick-up Roller Picks up pages of the document from the document
table one at a time.
2 Separation Tab Prevents more than one sheet from feeding into the
scanner.
3 Document Feed Roller Feeds the document to the document feed-in roller.
4 Document Feed-in Roller Feeds the document through the scanning area.
5 Document Feed-out Roller Feeds the document out from the scanning area.
6 CCD Unit Contains the CCD and LED array.
7 Laser Unit Consists of the laser diode unit, cylindrical lens, f-
theta lens, polygon mirror motor, and other laser
optical components.
8 Upper Tray Bottom Plate Presses paper stacked in the upper paper tray
against the paper feed roller.
9 Paper Feed Roller Picks up the top sheet of paper from the stack in the
upper paper tray and feeds it into the transfer area.
10 Toner Cassette Consists of the OPC drum, toner, toner application
roller, development roller, charge brush roller,
cleaning blade, and other development components.
11 Transfer Roller Applies a charge to the paper to pull the toner off the
drum and onto the copy paper.
12 Pressure Roller Applies pressure to the paper during fusing.
13 Hot Roller Fuses the toner to the copy paper.
14 Paper Exit Roller Feeds the paper out of the printer.
G027V101.WMF
1 2 3 4 5
6
7
8
910111213
14

COMPONENT LAYOUT 18 May, 1999
1-8
G027 model
No. Name Description
1 Exposure Glass The original is placed here for scanning.
2 Pick-up Roller Picks up pages of the document from the document
table one at a time.
3 Separation Tab Prevents more than one sheet from feeding into the
scanner.
4 Document Feed Roller Feeds the document to the document feed-in roller.
5 Document Feed-in Roller Feeds the document through the scanning area.
6 Document Feed-out Roller Feeds the document out from the scanning area.
7 CCD Unit Contains the CCD and LED array.
8 Laser Unit Consists of the laser diode unit, cylindrical lens, f-
theta lens, polygon mirror motor, and other laser
optical components.
9 Upper Tray Bottom Plate Presses paper stacked in the upper paper tray
against the paper feed roller.
10 Paper Feed Roller Picks up the top sheet of paper from the stack in the
upper paper tray and feeds it into the transfer area.
11 Toner Cassette Consists of the OPC drum, toner, toner application
roller, development roller, charge brush roller,
cleaning blade, and other development components.
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.
G027V512.WMF
1 2 3
7
10
8
911
1415
6
13 12
45

18 May, 1999 COMPONENT LAYOUT
1-9
Overall
Information
1.3.2 ELECTRICAL COMPONENTS
G027 model G025 model
G027 G025 Name Description
1 1 Toner End Sensor This detects when the toner has run out.
2 2 Paper Width Sensor This detects whether the paper in the upper
paper tray is wider than 203 millimeters or
not.
3 3 Paper End Sensor This detects when the paper in the upper
paper tray has run out.
4 - Platen Cover Switch This detects when the platen cover is
opened.
5 4 Main Motor This DC motor drives the toner cassette,
paper feed mechanism, and fusing unit.
6 - Home Position Sensor This detects when the CCD unit is at the
home position.
7 7 Document Sensor This detects the presence of a document in
the feeder.
8 8 ADF Registration Sensor This detects the leading and trailing edges
of originals, and checks for jams.
9 9 ADF Motor This stepper motor drives the ADF
mechanism.
10 10 Paper Pick-up Solenoid This releases the cam stopper to pick up a
sheet of paper.
11 6 Operation Panel This board controls the operation panel.
12 - Scanner Motor This stepper motor drives the book scanner.
13 5 Monitor Speaker Allows the user to hear dial tone and the
key-touch tone.
G027V518.WMF G027V513.WMF
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2
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3
5
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12
11
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3
4
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67 8 9
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COMPONENT LAYOUT 18 May, 1999
1-10
G027 model (G025 model parts are in the same location as G027)
No. Name Description
14 Fan Motor Blows hot air out of the machine.
15 Control Board Controls the machine.
16 Scanner Control Board
(SCB) Controls the scanner components.
17 Network Control Board
(NCU) Contains relays and switches to interface the machine with the network and the handset.
18 Mechanical Control
Board (MCB) Controls the printer components.
19 CCD Unit Includes the CCD and LED array. The CCD reads
and converts the light reflected from the document
into an analog video signal. The LED array
illuminates the document.
20 Power Supply Unit (PSU) Supplies power to the machine.
21 Paper Registration
Sensor Detects when leading edge of the copy paper reaches the registration area.
22 Paper Exit Sensor Detects when paper is fed out of the fusing unit
23 Interlock Switch If the upper cover is open, this interlock switch cuts
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.
24 Thermofuse Interrupts the AC power supply to the fusing lamp if
the temperature of the thermostat surface exceeds
250°C.
25 Fusing Lamp Fuses the toner to the paper.
26 Thermistor Monitors the temperature inside the fusing unit.
G027V519.WMF
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16
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18 May, 1999 OVERALL MACHINE CONTROL
1-11
Overall
Information
1.4 OVERALL MACHINE CONTROL
This machine contains a control board, mechanical control board (MCB), scanner
control board (SCB), network control board (NCU), and power supply unit (PSU).
The control board controls the system and interfaces with the SCB, MCB, and the
PC.
The control board also contains a modem chip and controls the network control
board (NCU).
The MCB controls devices related to the printer port, and the optional paper feed
unit. It also has an onboard power pack that generates high voltage supplies
necessary for the printing process.
The SCB controls devices related to the scanner.
The NCU contains relays and switches to interface the machine with the network
and the handset.
The PSU generates constant +24, +5 and -5 DC voltages and supplies them to the
boards. It also supplies AC power to the fusing lamp.
H8 LC82103 GSPC
Driver
Driver
Scanner Motor
ADF Motor
SCB
IEEE1284
Second
Printer
Operation Panel CCD Unit
IEEE1284
PC
Xipchip
Flash ROM
(4MB) Flash ROM (1MB) DRAM
SIMM Memory
(4/8/16/32MB)
EEPROM
(8KB)
PLD
IEEE1284
Driver
Analog
Switch
Control Board
Optional Paper
Feed Unit
Main
Motor
H8 GEPC
Power
Pack
MCB
Driver
Polygonal
Mirror
Motor
Laser
Diode
Unit
PSU
Fusing Lamp
MDM
Amplifier
NCU
(G027 only)
RTC
G027V514.WMF