Ricoh fax2000 SPECIFICATIONS fx2000

SCHMIDT 1

RICOH FAX2000L

SERVICE MANUAL

6 November, 1998
Subject to change

Important Safety Notices

H545R500.WMF

Laser Safety

WARNING FOR LASER UNIT

I

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.

Lithium Batteries (Memory Back-up)

CAUTION

I

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
manufacturer's instructions.

Trademarks

Windows 95/98, and Windows NT are registered trademarks of Microsoft
Corporation.
PCL is a registered trademark of Hewlett-Packard Company.
WinStylerTM is a trademark of Destiny Technology Corporation.

General Notice:
Other product names used herein are for identification purposes only and may be
trademarks of their respective companies. We disclaim any and all rights in those
marks.

6 November, 1998 SPECIFICATIONS

1. OVERALL MACHINE INFORMATION

1.1 SPECIFICATIONS

Type

Desktop transceiver

Circuit

PSTN, PABX

Connection

Direct couple

Document Size
Length:

105 - 364 mm [4.1 - 14.3 ins]
Up to 1.2 m [47.2 ins], manually
assisted

Width:

148 - 217 mm [5.8 - 8.5 ins]

Thickness:

0.05 to 0.2 mm [2 to 8 mils]
(equivalent to 50 - 90 g/m

Document Feed

Automatic feed, face down

2

)

Compression

MH, MR, MMR, and SSC
SAF storage for memory TX: MMR
and/or raw data

Protocol

Group 3 with ECM

Modulation

V.34, V.33 (Ricoh mode only),
V.17 (TCM), V.29 (QAM), V.27ter
(PHM), V.21 (FM)

Data Rate (BPS)

33,600/31,200/28,800/26,400/24,000/
21,600/19,200/16,800/14,400/12,000/
9600/7200/4800/2400

I/O Rate

With ECM: 0 ms/line
Without ECM: 2.5, 5, 10, 20, or 40
ms/line

Overall

Information

ADF Capacity

30 sheets (using Letter size 20 lb paper
or A4 size 80 g/m2)
15 sheets (using LG size 20 lb. paper)

Scanning Method

Contact image sensor, with xenon lamp

Maximum Scan Width

216 mm [8.5 ins] ± 0.25%
(Effective scan width: 210 mm)

Scan Resolutions
Main scan:

8 dots/mm [203 dpi]

Sub scan:

Standard - 3.85 lines/mm [98 dpi]
Detail - 7.7 lines/mm [196 dpi]
Fine - 15.4 lines/mm [392 dpi]

Memory Capacity
ECM:

128 Kbytes

SAF:

Standard: 512 KB (40 pages/ITU-T #1)
With 1 MB option: 120 pages
With 2 MB option: 200 pages

Transmission Time

3 seconds at 28,800 bps: Measured
with G3 ECM using memory for an ITU­T #1 test document (Slerexe letter ) at
standard resolution

Printing System

Laser printing, plain paper, dry toner

Printing Time

6 ppm for letter-size paper

Paper Size and Capacity
Standard Cassette:

250 sheets

Letter, Legal, A4, A5 sideways, F4

Multi-purpose Feeder (Optional):

100 sheets: Letter, Legal, Half-letter,
A4, A5, US-Exe, F4
10 sheets: OHP, Envelope

Paper Feed Unit (Optional):

500 sheets: Letter, Legal, A4,
A5 sideways, F4

1-1

SPECIFICATIONS 6 November, 1998

Maximum Printing Width

208 mm [8.1 ins]

Print Resolutions
Fax and Copy Mode:

Main scan: 16 dots/mm [406 dpi]
Sub scan: 15.4 lines/mm [392 lpi]

Printer Mode:

600 x 600 dpi

Power Supply

115 ± 20 Vac, 60 ± 1 Hz

USA:
Europe/Asia:

220 - 240 ±15% Vac,

50/60 ± 3 Hz

Power Consumption (Base Machine
Only)
Standby:

Minimum 2 W; Normal 25 W

Transmit:
Receive:
Copying

42 W

280 W

: 370 W

Operating Environment
Temperature:
Humidity:

15 - 25 °C [59 - 77 °F]

30 - 70 %Rh

Dimensions (W x D x H)

399 x 730 x 323 mm
[15.7 x 28.7 x 12.7 ins]
Including trays (Maximum dimensions)

Weight

Approx. 12.5 kg [27.6 lbs.]
Including cartridge and trays.

1-2

6 November, 1998 FEATURES

1.2 FEATURES

KEY: O = Used, X = Not Used,
A = With optional memory only,
B = With optional multi-purpose feeder only
C = With optional handset only
D = With optional PC interface only
E = With optional paper feed unit only

Equipment

ADF O
Book scan X
Bypass feed: 1 sheet X
Optional cassette: 100

sheets
Optional cassette: Universal O
Optional paper feed unit E
Cabinet X
Mechanical counter X
Cutter X
Handset C
Hard disk X
Manual feed mechanism X
Marker (Stamp) X
Monitor speaker O
Optional memory O
Optional printer interface D

Video Processing Features

Automatic image density
selection

Contrast O
Halftone (Basic & Error

diffusion)
JBIG compression X
MTF O
Reduction before TX X
Scanning resolution O
Smoothing to 16 x 15.4 l/mm O

Communication Features - Auto

AI short protocol O
Automatic fallb a ck O
Automatic redialing O
Confidential reception O
Dual access O

B

X

O

Communication Features - Auto

Resolutions available for
reception
Fine
Super fine

Substitute reception O
V.34 communication O

Communication Features -

User Selectable

Action as a transfer
broadcaster

AI Redial (last ten numbers) O
Answering machine interface O
Authorized Reception O
Auto dialing (pulse or DTMF) O
Auto document X
Automatic voice message X
Batch transmission (max 35

files)
Broadcasting O
Chain dialing O
Communication result

display
Confidential ID override X
Confidential transmission X
Direct fax number entry O
Economy transmission X
Fax on demand X
Forwarding O
Groups (5 groups) O
Hold X
ID transmission X
Immediate redialing O
Immediate transmission O
ISDN X
Keystroke programs O
Memory transmission O
Multi-step transfer X
OMR X
On hook dial O
Ordering toner X
Page count O
Page separation mark O

X
X

X

O

X

Overall

Information

1-3

FEATURES 6 November, 1998

Communication Features -

User Selectable

Parallel memory

X

transmission
Personal codes O
Personal codes with conf. ID O
Partial image area scanning X
Polling reception O
Polling transmission X
Polling tx file lifetime in the

X

SAF
PWD (tx on l y) O
Quick dial (30 stations) O
Reception modes (Fax, Tel,

O

Auto)
Remote control features X
Remote transfer X
Restricted access X
Secured polling reception X
Secured polling reception

X

with Stored ID override
Send later O
SEP (tx only) O
SID (tx onl y) O
Silent ringing detection X
Specified Image area X
Speed dial (50 stations) O
SUB (tx only) O
Telephone directory O
Tonal signal transmission O
Transfer request X
Transmission deadline

X

(TRD)
Turnaround polling X
Two-step transfer X
Two in one X
Voice request (immediate TX

X

only)

Communication Features -

Service Selectable

AI short protocol O
Auto-reduction override

O

option
Busy tone detection O
Cable equalizer O
Closed network (TX and RX) X

Communication Features -

Service Selectable

Continuous polling reception X
Dedicated TX parameters O
ECM O
EFC X
Inch-mm conversion X
Page retransmission times O
Protection against bad

O

connections
Short preamble X

Other User Features

Area code prefix X
Automatic service call

Service

Center mark O
Checkered mark X
Clearing a memory file O
Clearing a polling file O
Clock O
Confidential ID O
Copy mode O
Copy mode restriction X
Counters O
Daylight saving time O
Destination check X
Direct entry of names O
Energy saver (Night timer

O

and standby mode)
File retention time X
File retransmission X
Function programs O
ID code X
Label insertion ("From xxx") O
Language selection O
LCD contrast control
Memory lock X
Modifying a memory file X
Multi-sort document

X

reception
Multi-copy mode (up to 99) O
Own telephone number O
PC scanner D
PC fax D
PC print D

X

1-4

6 November, 1998 FEATURES

Other User Features

Print density control X
Printing a memory file O
Quick dial label printing O
RDS on/off O
Reception mode switching

X

timer
Reception time printing X
Remaining memory indicator O
Remote ID X
Reverse order printing O
RTI, TTI, CSI O
Service report transmission X
Speaker volume control O
Specified cassette selection E
Substitute reception on/off O
Telephone line type O
Toner saving mode X
User function keys O
User parameters O
Wild cards O

Reports - Automatic

Charge control report X
Communication failure report O
Communication result report O
Confidential file report O
Error report O
File clear report X
File reserve report X
Journal O
Power failure report O
Toner cassette order form X
Transfer resul t report X
Transmission result report O

Reports – User-initiated

Charge control report X
File list O
Group list O
Journal O
Personal code list O
Program list O
Programmed special

O

numbers list

Reports – User-initiated

Quick dial / User function list O
Speed dial list O
Transmission status report X
User parameter list O

Service Mode Features

Back-to-back test O
Bit switch programming O
Book mode test X
Buzzer test O
Cable equalizer O
Comm. Parameter display O
Counter check O
Country code O
DTMF tone test O
Echo countermeasure O
Effective term of service calls O
Error code display O
Excessive jam alarm O
File transfer (all files) O
LCD contrast adjustment X
Line error mark O
Memory file printout (all files) O
Modem software download X
Modem test O
NCU parameters O
Operation panel test O
Periodic service call O
PM call O
Printer mechanism test O
Printer test patterns O
Programmable attenuation X
Protocol dump list O
RAM display/rewrite O
RAM dump O
RAM test O
RDS O
Ringer test X
Scanner lamp test O
Scanner mechanism test O
Sensor initialization X
Serial number O
Service monitor report O
Service station number O
Software upload/download O

Overall

Information

1-5

FEATURES 6 November, 1998

Service Mode Features

SRAM data upload/download O
System parameter list O
Technical data on the

Journal
Thermal head parameters X

O

Memory Files

Maximum number of files: 100
Maximum number of stations/file: 100
Maximum number of stations: 200

1-6

4 September, 1998 COMPONENT LAYOUT

1.3 COMPONENT LAYOUT

1.3.1 MECHANICAL COMPONENTS

1 52 3 4 6 8

18
17

7

Overall

Information

16

H545V501.WMF

12

No Name Description

1 R2 Roller Feeds the document through the scanner.
2 R1 Roller Feeds the document through the scanner.
3 Separation Roller Allo ws one page into the scanner.
4 Document Feed Belt Feeds the document into the scanner.
5 Pick-up Roller

6 Pressure Plate Applies pressure against the pick-up roller.
7 All-in-One Cartridge Consists of the toner cartridge, cleaning unit, used

8 Laser Unit

9 Paper Feed Roller

10 Separation Pad Allows one sheet of paper into the printer.
11 Registration Roller Carr ies out the registration process.
12 OPC Drum The latent image is written to this organic

Picks up document pages from the document table
one at a time.

toner tank, charge brush roller, application roller,
development roller and OPC drum.

Consists of the LDDR (Laser Diode Driver), focusing
lens, hexagonal mirror motor, and other laser optic
components.

Picks up the top sheet of paper from the stack in the
cassette, and feeds it into the printer.

photoconductor drum.

11131415

9

10

1-7

COMPONENT LAYOUT 4 September, 1998

No Name Description

13 Transfer Roller
14 Hot Roller Heat from this roller fuses the toner to the copy paper.

15 Fusing Pressure Roller Applies pressure to the paper during the fusing
16 Paper Feed-out Rollers Feed the paper out of the printer.

17 Hot Roller Strippers Take the paper off the hot roller after fusing.
18 Cleaning Pad Cleans up and spreads silicone oil on the surface of

Applies a charge to the paper to pull the toner off the
drum and onto the copy paper.

process.

the hot roller.

1-8

4 September, 1998 COMPONENT LAYOUT

1.3.2 ELECTRICAL COMPONENTS

22

21

20

19

1 2 3 4

H545V502.WMF

141618

17

15

23

5

6

Overall

Information

7

8
9
10
11

12

13

27

28

24

25

26

H545V503.WMF

1-9

COMPONENT LAYOUT 4 September, 1998

1. PCBs

No Name Description

CIS (Contact Image

2

Sensor)

5 LDDR (Laser Diode

Driver)

23 NCU (Network Control

Unit)

24 OPU (Operation Panel

Unit)

25 FCU (Facsimile Control

Unit)

26 PC Interface (Option)
27 Power Pack Supplies high voltage to the charge brush roller,
28 PSU (Power Supply

Unit)

This sensor reads and converts the light reflected from
the document into an analog video signal.

This board drives the laser diode.
This board contains relays and switches for interfacing

the machine with the network and the handset.
This board controls the operation panel.

This board controls the machine. It contains the main
CPU, flash ROM, system RAM, etc.

This allows the machine to be connected to a
computer as a PC printer, PC scanner, and PC fax.

transfer roller and development rollers.
This board supplies power to the machine, and

switches the fusing lamp on/off.

2. Motors

No Name Description

4 Polygon Mirror Motor This high-speed dc motor drives the hexagonal mirror

in the laser printer optics.

7 Main Motor This stepper motor drives the All-in-One cartridge and

the fusing unit.

11 Paper Feed Motor This stepper motor drives the registration roller and

the paper feed mechanisms in the cassettes.
15 Scanner Motor This stepper motor drives the scanner.
21 Cooling Fan Motor Cools the interior of the machine.

3. Sensors

No Name Description

1 Document Sensor Detects the presence of a document in the feeder.
3 Paper End Sensor Detects when the paper in the cassette has run out.
6 Paper Edge Sensor Detects when the paper has passed the paper feed

components.

8 Rear Upper Cover Switch
9 Rear Lower Cover Switch Detects whether the rear lower cover is open or

16 Registration Sensor Detects when paper reaches the registration roller.
19 Fusing Exit Sensor Detects when the paper feeds out of the printer.
22 Toner End Sensor Det ects when the toner has run out.

Detects whether the rear upper cover is open or
closed.

closed.

1-10

4 September, 1998 COMPONENT LAYOUT

4. Interlock Switches

No Name Description

1213 Interlock Switches

If the fusing unit cover and/or top cover are open,

these switches interrupt the +5VLD power supply for

the laser diode and the +24VD power supply for the

power pack, motors, and other components.

5. Others

No Name Description

10 Paper Feed Clutch Transfers drive from the paper feed motor to the paper

feed roller.
14 Monitor Speaker Allows the user to hear the telephone line condition.
17 Fusing Lamp The heat from this lamp fuses the toner to the paper.
18 Thermistor Monitors the temperature on the hot roller surface.
20 Thermostat Interrupts the ac power supply for the fusing lamp if

the thermostat temperature exceeds 400°C.

Overall

Information

1-11

COMPONENT LAYOUT 4 September, 1998

6. Optional Paper Feed Unit and Multi Purpose Feeder

1

2

5

3

8

H545V504.WMF

4

No Name Description

Paper End Sensor

1

(Paper Feed Unit)

2 Paper Feed Roller

(Paper Feed Unit)

3 Paper Feed Clutch

(Paper Feed Unit)
Cassette Switch

4

(Paper Feed Unit)

5 Rear Cover Switch

(Paper Feed Unit)
Paper Feed Roller

6

(Multi-purpose Feeder)

7 Paper Feed Solenoid

(Multi-purpose Feeder)

8 Paper End Sensor and

Paper Width Sensor
(Multi-purpose Feeder)

This detects when the paper in the cassette has run

out.

Picks up the top sheet of paper from the stack in the

cassette, and feeds it into the printer.

Transfers drive from the paper feed motor in the

mainframe to the paper feed roller in the cassette.

This detects whether the cassette is installed or not.

This detects whether the rear cover is open or close.

Picks up the top sheet of paper from the stack in the

feeder, and feeds it into the printer.

Transfers drive from the paper feed motor in the

mainframe to the paper feed roller in the feeder.

Paper end sensor: This detects when the paper in the

feeder has run out.

Paper width sensor: This detects the paper width

installed in the feeder.

7

6

H545V516.WMF

1-12

4 September, 1998 OVERALL MACHINE CONTROL

1.4 OVERALL MACHINE CONTROL

Bi-Centronics
(Parallel)

PC

FCU

DRAM

DRAM

SRAM

AFE

NCU

Address Data

Multiplexer

SYSTEM BUS

Flash
ROM

Modem

D9001LFD6002

Energy

Saver

CPU

FCIP2

Operation

Panel

PC I/F

Data

Data &
Control

Printer

Control

Scanner

H545V505.WMF

The FCU (Facsimile Control Unit) contains most of the logical components for
overall system control, and a direct interface to the IC card and PC interface board.

Overall

Information

There are two CPUs in the machine: the main CPU (FCIP2) and the energy saver
CPU. Both of these are on the FCU. In energy saver mode, the main CPU switches
off and the energy saver CPU takes over.

After installing the PC interface, the machine can communicate with a PC and work
multi-functionally as a PC printer, PC scanner and PC fax.

1-13

VIDEO DATA PATH 4 September, 1998

y

g

y

y

y

1.5 VIDEO DATA PATH

1.5.1 TRANSMISSION

Original

Contact Image Sensor Assembl

LED

Image Sensor

Amplifier

Video

Processin

Memor

DATA/ADDRESS BUS

Line Buffer

/FIFO

Memor

DIP

FCIP2

DCR

DRAM

ECM/SAF

Memor

MDM Amplifier

Attenuator

HIC

NCU

To the network

H545V506.WMF

Immediate Transmission:

Scanned data from the contact image sensor passes to the DIP block in the FCIP2.
After analog/digital video processing, the DCR block compresses the data for
transmission. The compressed data then passes either to the FIFO memory or to
the ECM memory before entering the telephone line through the modem.

FCU

Memory Transmission:

First, the scanned data is stored in the SAF memory after compression in the DCR
block. At the time of transmission, the DCR block decompresses the data from the
SAF memory, then compresses it again after handshaking with the other terminal is
complete. The compressed data then passes either to the FIFO memory or to the
ECM memory, before entering the telephone line through the modem.

1-14

4 September, 1998 VIDEO DATA PATH

1.5.2 RECEPTION

From the Network

NCU

HIC

Amplifier

MDM

FCIP2

DCR LIF

MDM: Modem
DCR: Data Compression and Reduction
LIF: Laser Interface

FCU

Overall

Information

Data/ Address Bus

LDDR

Line Buffer

/FIFO

Memory

ECM/SAF

Memory

DRAM

Page

Memory

Copy Paper

H545V507.WMF

Data from the line passes to the modem through the NCU and hybrid integrated
circuit (HIC). After the modem demodulates the data, it passes through either the
FIFO or the ECM memory to the DCR block, which decompresses it into raster
image data. At the same time, the compressed data passes to the SAF memory as
a backup in case of mechanical problems during printing (this is known as
substitute reception).

The raster image data then passes to the page memory for printing. After a page of
data has been stored in the page memory, the data is sent to the LDDR through
the LIF block.

1-15

VIDEO DATA PATH 4 September, 1998

1.5.3 COPYING

Original

Contact Image Sensor Assembly

Video

Processing

Memory

Line Buffer

/FIFO

Memory

LED

Amplifier

FCIP2

DCR LIF

DATA/ADDRESS BUS

ECM/SAF

Memory

DRAM

Image Sensor

DIP

Memory

Page

FCU

LDDR

Copy Paper

H545V508.WMF

Single copy

The scanned data passes to the page memory after video processing in the DIP
block. After a page of data has been stored in the page memory, the data is sent to
the LDDR through the LIF block.

Multi-page copy

The scanned data passes to the SAF memory after video processing (DIP) and
compression (DCR). After a page of data has been stored in the SAF memory, the
data passes to the DCR block again for decompression, and then it passes to the
page memory for printing.

1-16

4 September, 1998 VIDEO DATA PATH

1.5.4 PC PRINTING

Overall

Information

PC

Data Data

D6002

DRAM

PC I/F

D9001

SJ4+

Data

FCU

Printer

Components

H545V511.WMF

This machine works as a GDI (Graphical Device Interface) printer when connected
to a PC through the parallel port.

When printing from the PC, the printer drive r (WinStyler T180) compresses the
video data and sends it to the D6002 IC through the parallel interface. The D6002
IC reconstructs the data and sends it to the D9001SJ4+ IC, which smooths the
data and treats it with the toner saving algorithm, if selected. The data is then sent
to the LDDR for printing.

Since the DRAM works as an I/O buffer, the page memory is not necessary for PC
printing.

1-17

VIDEO DATA PATH 4 September, 1998

Windows

Application

GDI.exe

GDI printer

driver

Spooler

LPT port

Schmidt1

DOS

application

Application program

Windows program

PCL

interpreter

WinStyler program

H545V521.WMF

GDI Driver for Windows 95/98

A GDI printer has built-in support for the Windows Graphical Device Interface
(GDI). GDI is a Windows standard for displaying graphical objects on monitors and
printing these objects. Since most Windows applications use a GDI, it is not
necessary to convert the output to another format such as PostScript or PCL.

PCL Interpreter for DOS Printing

The PCL interpreter allows printing from a DOS window for DOS applications.
The PCL interpreter does not work in a pure DOS environment, and is not
supported under Windows NT4.0.

WinStyler T180 does not have a PCL driver mode for printing from Windows
applications.

1-18

4 September, 1998 VIDEO DATA PATH

1.5.5 PC SCANNING

PC

D6002

FCIP2

Scanner

DCR DIP

Data/Address Bus

ECM

Memory

Overall

Information

PC I/F

FCU

H545V512.WMF

The scanned data passes through the DIP block in the FCIP2 for analog/digital
processing. The DCR block in the FCIP2 compresses the data and passes it
through the ECM memory. Then it goes to the PC through the D6002 without any
processing. The data is reconstructed in the driver in the PC (the image processing
is the same as for fax scanning).

1-19

VIDEO DATA PATH 4 September, 1998

y

1.5.6 PC FAX

PC

PC I/F

Data/Address Bus

FCU

D6002

FCIP2 Modem

Amplifier

ECM

Memor

HIC

NCU

To the network

H545V514.WMF

PC Fax Transmission

The application software compresses the PC data. It then produces the AT
commands and sends them to the specified PC parallel port.

Then the commands and data are sent from the parallel port to the machine. The
D6002 passes these to the FCIP2. The FCIP2 controls the modem in accordance
with the AT commands sent from the PC. It then sends the data to the ECM
memory through the D6002 (the D6002 does not process the data), and on to the
telephone line through the modem and the NCU.

PC Fax Reception

The data from the line passes to the modem through the NCU. The data
demodulated in the modem passes to the D6002 through the ECM memory. The
PC Fax application software then reconstructs the data.

1-20

4 September, 1998 POWER DISTRIBUTION

1.6 POWER DISTRIBUTION

1.6.1 DISTRIBUTION DIAGRAM

AC

Main

Power

AC Switching

Fusing Lamp

ON/OFF

Switching

AC115V or

Fusing Lamp

Circuit

Circuit

230V

PC I/F

Main Switch

PSU

24VIN

+5V

+5VE

IC

Card

-9V

+24V

+5VD

24VM

24VD

+5V

Paper Feed

+5VP

Converter

Converter

Interlock

Unit

+5V

DC-DC

DC-DC

Switch

+24VM

Multi Purpose

Feeder

+12V

+5VE

+5VLD+5V

Polygon

Motor

+5V

+5V

+24VM

-9V

Converter

+5VLD

+24V

+5V

+5VEE

LDDR Image Sensor

NCU

DC-DC

+5V

Main

Motor

+24VMM

+24VM

-9VV

Paper Feed

Clutch

FCU

+5VV

+24VMS

+24VMM

+24VM

+24VPP

+5VT

+5V

+5VOPP

+5VE

+24VMM

+24V

Paper Feed

Motor

Fusing Fan

Power Pack

Thermistor

Sensors

Operation Panel

Scanner Motor

Toner End

Sensor

+5V

-9V

Overall

Information

H545V515.WMF

The PSU supplies +24V dc power to the FCU. The FCU converts the +24V into the
following supplies:

+5V Normally on when the main switch is.

+5VE Detects an activation signal from the NCU, document feeder, or operation panel

when the machine is in energy saving mode.

+5VT For the thermistor.

+5VLD Supplies the laser diode. It is interrupted if the fusing unit cover interlock switch

opens.

+5VV This is a more stable power supply than +5V. It is used for the contact image

sensor.

+5VD

+5VBAT

+24V Normally on when the main switch is.

+24VD This is interrupted if the fusing unit cover interlock switch opens.

+24VIN

+24VMM For the scanner, paper feed, and main motors.

+24VPP For the power pack.

-9V For the image sensor.

+5VP For the optional IC card.

Supplies back up power for the DRAM and the optional IC card on the FCU. It can
back up stored data for one hour after the power is switched off. A rechargeable
battery on the FCU generates +5VD.

Supplies back up power to the system RAM on the FCU to back up the
programmed data. A lithium battery generates +5VBAT.

Supplies +24V to the fusing unit on/off switching circuit. It is interrupted if the fusing
unit cover interlock switch opens.

1-21

6 November, 1998 SCANNER

2. DETAILED SECTION DESCRIPTIONS

2.1 SCANNER

2.1.1 MECHANISMS

1. Document Detection

[A]

H545D512.WMF

The document sensor [A] detects a document when it is placed in the ADF.

2. Pick-up and Separation and Drive Mechanism

[A]

[B]

[D]

[C]

Detailed

Descriptions

[F]

[E]

[G]

H545D502.WMF

The pressure plate [A] aligns the leading edges of the pages of the document.
When the machine starts feeding the document, the mechanical clutch in the ADF
roller unit lifts up the pick-up rollers [B] to feed the bottom sheet of the document.
Then, the feed belt [C] feeds the sheet into the scanner.
The separation roller [D] prevents the feed belt from feeding more than one sheet
at a time.

The scanner motor [E] drives the pick-up rollers [B], feed belt [C], R1 roller [F], and
R2 roller [G].

Cross Reference

ADF mechanical clutch mechanism: Group 3 Facsimile Manual, page 2-2-8.
Maximum document length: Scanner Switch 00, bits 2 and 3.

2-1

SCANNER 6 November, 1998

4. Image Scanning

[A]

[B]

[C]

H545D503.WMF

The image sensor [B] consists of a row of 1728 photosensitive elements (Letter
width x 8 dots/mm). The document reflects light from the LED array and the rod
lens array focuses it onto the image sensor. Because of the short optical path
inside the CIS, the focal depth is much shorter than for a CCD type scanner.
Consequently, the spring plates [C] push the white roller [A] so that the document
surface always touches the exposure glass at the scan line.

The image sensor assembly is factory adjusted, so it does not require adjustment
or replacement in the f ield.

The image sensor scans the original one line at a time, and outputs an analog
signal for each line. The voltage from each element depends on the intensity of the
light reflected from the original onto the element; the light intensity depends on the
darkness of the document area it was reflected from.

The white roller [A] must be kept clean, because the machine scans it every page
to calibrate the white level (auto shading).

2-2

6 November, 1998 SCANNER

2.1.2 JAM CONDITIONS

The main CPU detects a document jam if one of the following conditions occurs.

Jam Condition Description

Non-feed The feed mechanism attempts to feed the

paper once every second for a maximum of
6 seconds. If the scan line sensor does not
detect the document within 6 seconds, the
monitor displays an error message.

Incorrect sensor
conditions

Maximum document length
exceeded

Cover open While the ADF is working, the ADF cover is
Error during feed-out

The scan line sensor turns on while the
document sensor is off.

The scan line sensor does not turn off after
the maximum document length has fed
through it. This occurs after 11 seconds at
standard resolution for memory TX; 23
seconds at standard resolution for
immediate TX or detail resolution; or 46
seconds at fine resolution (all these times
are for a 1.2-m long document).

opened.
The scanner motor reverses when the final

page of the document feeds out of the
scanner and/or when removing a jammed
document. This error occurs when placing a
document into the feeder while the motor is
rotating.

Error
Code

1-00

Detailed

Descriptions

1-01

No error

code

No error

code

2-3

PRINTING 6 November, 1998

2.2 PRINTING

2.2.1 PRINTING PROCESS - OVERVIEW

-1.2kV

-200V

m

+4.3

A

m

-650V
(0V)

H545D521.WMF

This machine uses a “write-to-black” system, with negative toner.

·

The charge-brush roller gives the drum surface an approximate negative

charge of -750 V.

·

The exposed area on the drum drops to about -200 V.

·

The development roller carries toner to the latent image on the drum surface.

The bias voltages during printing:
Toner application roller : -650 V
Development roller: -400 V

·

The transfer roller pulls the toner from the drum onto the paper.

A constant current of +4.3 mA is applied. The anti-static brush helps to
separate the paper from the drum.

·

The cleaning blade removes any toner remaining on the drum after the image

transfers to the paper.

·

This machine does not use quenching lamp.

2-4

6 November, 1998 PRINTING

2.2.2 OPC DRUM

[C]
[D]

[B]

[A]

[E]

H545D504.WMF

The cartridge contains an organic photo-conductor drum [A]. The diameter of the
drum is 24 mm. The main motor [B] drives it through a gear train. The same gear
train also drives the toner application roller [C], development roller [D], and transfer
roller [E].

The drum, development roller, fresh and used toner tanks, and cleaning
mechanism are all included in the cartridge, which is known as the “All-in-One”
cartridge.

Detailed

Descriptions

2.2.3 CHARGE

[A]

H545D517.WMF

The cartridge contains a charge brush roller [A]. The diameter of the roller is 12
mm. The charge brush roller does not generate ozone. The power pack applies a
constant voltage of about –1.2 kV. The charge brush roller gives the drum surface
a negative charge (-750V).

2-5

PRINTING 6 November, 1998

2.2.4 LASER EXPOSURE

Overview

[C]

[E]

[A]

[B]

H545D505.WMF

·

The focusing lens [A] is a double toroidal lens that has a barrel toroidal

[D]

[F]

surface on both sides.

·

The shield glass [B] prevents toner and dust from entering the laser optics

area.

·

The speed of the hexagonal mirror motor [C] depends on the printing

resolution:

Mode Speed

Copy and Fax - mm mode (16 x 15.4 dots/mm) 5793.88 rpm
Printer mode (600 dpi) 8886.59 rpm

·

The strength of the beam emitted from the LD unit [D] is 0.2 mW with a

wavelength of 780 nm . The photo transistor [E] inside the LD unit
synchronizes the laser main scan.

·

The mirror [F] reflects the laser beam onto the drum.

The charge on the exposed areas of the drum drops to about -200V while non­exposed areas remain at around -750V.

As a mechanical safety feature, a shutter slides to block the laser beam path
whenever the upper unit is opened.

Cross Reference

Group 3 Facsimile Manual: section 4-3-3

2-6