Ricoh FAX2500L SPECIFICATIONS 3000 u

FAX3000L/3200L

SERVICE MANUAL

Throughout this manual, the machines are referred to as follows.

Type A: FAX3000L Type B: FAX3200L

WARNING

DANGER

INVISIBLE LASER RADIATION WHEN OPEN AVOID DIRECT

EXPOSURE TO BEAM

DANGER

RAYON LASER INVISIBLE

LORS DE L’OUVERTURE

EVITER L’EXPOSITION DIRECTE

VORSICHT

Unsichtbare Laserstrahlung

unter dieser Abdeckung. Nicht

in den laserstrahl blicken.

PELIGRO

RADIACION LASER INVISIBLE

AL ABRIR. EVITAR LA

EXPOSICION DIRECTA AL HAZ

THIS MACHIN E CONTAINS A LASER BEAM GENERATOR. LASER

BEAM S CAN CAUSE PERM ANENT EYE DAM AGE. DO NOT OPEN

THE LASER UNIT O R LOOK ALONG TH E LASER BEAM PATH

WHILE THE M AIN POWER I S ON.

Lithium Batteries (Memory Back-up) CAUTION:

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 manufactu rer’s instructions.

OVERALL MACHINE INFORMATION November 30th, 1991 SPECIFICATIONS

1. OVERALL MACHINE INFORMATION

1.1. SP ECIFICATIONS

Type

Desktop transceiver

Circuit

PSTN, PABX

Connection

Direct couple

Document Size Length: 105 - 1200 mm

[4.1 - 47.2 ins] Up to 100 m [328 ft] after adjustment Width: 148 - 304 mm

[5.8 - 12.0 ins] Thickness: 0.05 to 0.2 mm

[2 to 8 mils]

Document Feed

Automatic feed, face down

ADF Capacity

50 sheets (using 20 lb paper)

Scanning Method

Flat bed, with CCD

Maximum Scan Width

256 mm [10.1 ins] ± 1%

Scan Resolution Main scan: 8 dots/mm [203 dpi] Sub scan:

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

Memory Capacity ECM: 128 kbytes (double buffer) SAF: Type A - 256 kbytes (14 pages)

Type B - 256 kbytes (14 pages), with optional extra 1 Mbyte or 2 Mbytes (max 71 or 128 pages respectively)

Compression

MH, MR, E FC, MMR , SSC Storage to SAF memory for tx: MH MMR only with ECM

Modulation

V.29 (QAM), V.27ter (PHM), V.21 (FM)

Data Rate

9600/7200/4800/2400 bps; automatic fallback

I/O Rate

With ECM : 0 ms/line Without ECM: 5, 1 0, 20, or 40 ms/line

Transmi ssi o n Time

10 s at 9600 bps (G3 ECM using memory) for a CCITT #1 test document (Slerexe letter) using standard resolution

Printing System

Las er printing, using the Ricoh CS (Compact Seamless) E ngine, plain paper, dry toner

Pap er Size Standa rd Cassette

Letter, Legal

Lower Ca ssette

Letter, Legal, A4, B4

Maximum Printout Width

210 mm [8.3 ins]

Ma ximu m Printer Resolutio n Main scan: 16 dots per mm [406 dpi] Sub scan: 15. 4 lines/mm [392 lpi]

Power Supply

115 ± 20 V ac, 60 ± 1 Hz

Power Consumption (Base Machine Only) Standby: 40 W Transmit: 50 W Receive: 210 W Copying: 300 W

Operating Environment Temperature: 17 - 28 °C [63 - 82 °F] Humidity: 40 - 70 %Rh

Dimensions (W x D x H)

496 x 459 x 293 mm [19.5 x 18.1 x 11.5 ins] Excluding handset, trays, and optional units

Weight

19 kg [41.8 lbs] Excluding handset, trays, and optional units

Protocol

Group 3 with ECM

1-1

November 30th, 1991 OVERALL MACHINE INFORMATION

FEATURES

1.2. FEATURES

KEY: O = Used, X = Not Used,

A = Type B with optional memory only, B = Type B only

Equipment

ADF O Bar code reade r X Built-in handset X Cabinet X Connection for ans. machine X Connection for handset O Cutter X Handset (option only) O Hard disk X Magnetic card reader X Manual f eed mechanism O Marker O Microphone X Monitor speaker O R emaining memory indicator O Speakerphone X

Video Processing Features

Contrast O Halftone (B asic & Error Dif fusion) O MTF O Reduction O R e s olution O Smoothing to 16 x 15.4 l/mm O

Communication Features - Auto

Automatic fallback O Automatic redialing O Confidential reception A Dual Acce ss O Substitute r eception O Transmission Reserve X

Communication Features -

User Selectable

Action as a transfer broadcaster X AI Redial O Alternative Destination O Answering machine X Authorize d Reception O Auto-answer dela y time X Auto dialing (pulse or DTMF) O Auto Docume n t O Automatic V oice Message X Auto-note X Batch Transmission (max 5 files) A Broadcasting O Chain Dialing O Confidential ID O v erride O Confidential Transmission O Forwarding (4 stations) A Fre e Polling O Gr oups (7 groups) O Hold X Immediate Redialing O Immediate transmission O Keystr oke Program s O Mailbox X Memory transmission (this is the

default mode) Notify X On Hook Dial O Page C ount O Per sonal Codes O Personal Codes with Conf ID O Polling R eception O Polling Transmission O Quick Dial (32 stations) O Reception mode s (Fax, Tel , Reduction O Remote control features X Remote Transfer X Restricted Access (10 codes,

without cards) Secured Polling O Secured Polling with Stored ID

Override Send Later O

Auto) O

1-2

OVERALL MACHINE INFORMATION November 30th, 1991 FEATURES

Communication Features -

User Selectable

Silent ringing detection X Speed Dial (100 stations) O Telephone Di rector y O Tonal Signal Transmission O Transfer Request O Transmission Deadline X Turnaround Polling X Voice Request (immed. tx only) O

Communication Features -

Service Selectable

AI Short Protocol X Auto-reduction override option O Bus y tone detection O Closed Ne twork (tx an d rx) O Continuous Polling Re ception O Dedicate d t x paramete r s O ECM O EFC O MV1200 compatibility X Page retransmission O Page separation m ark O Polling tx file lifetime in the SAF O Protection against wrong conn. O R esol’n stepdown override option X Short Preamble O W ell log O

Other User Features

Auto Service Call O Ce n ter mark O Checkered mark X Clea ring a memory file O Clea ring a polling file O Clock O Confidential ID O Copy m ode O Counters O Dialed number check X Direct entry of names O Function Progr ams O ID Code O Label Insertion O Language Selection O LCD contrast control S ervic e

Memory L ock A Memory L ock ID A Modifying a memory file X Mu lti So rt Document Rece p t ion A Multicopy m ode A Night Timer O Own t elephone number O Printing a memory file O RDS on/off O R eception Mode S witching T ime r X Reception Time (non- memory rx

only) Re mote ID X R everse Order Printing A RTI, TTI, CSI O Speaker volume control O Specified Cassette S election B Substitute r eception on/off O Telephone line type O TTI on/off O Use r Function Keys X User Parameters O Wild Cards O

Reports - Automatic

Charge Control Report X Communication Failure Report O Confidential File Report O Error Report O Memory Storage Report O Mode Chan ge Report X Polling Clea r Report O Polling R eserve Report O Polling R esult Report O Power Failure Report O TCR O Transfer Result Report X Transmission Result Report O

Reports - User-initiated

Authorized R eception List O Charge Control Report X File L is t O Forwarding List A Gr oup List O Per sonal Code List O Program List O

1-3

November 30th, 1991 OVERALL MACHINE INFORMATION

FEATURES

Reports - User-initiated

Quick Dial List O Specified Cassette Selection List B Speed Dial List O TCR O Transmission Status Report X User Function List X Use r Paramete r List O

Service Mode Features

Back-to-back t est O Bit switch programming O Buzzer test O Cable equalizer (rx only) O Comm. par ameter display O DTMF tone test O Echo countermeasure O Error code display O LCD contrast adjustment O Memory file forwarding O Memory file printout (all files) O Modem te st O NCU parameters O Operation panel test O Printer mechanism test X Printer te st patterns O Progra mmable atten u ation X Protocol dum p list O R AM display/rewrite O RAM dump O R inger tes t X Scanner la mp test O Scan n er mechanism test O Sens or initialization X Serial number O Service m onitor repor t O Serv ice s tation numbe r O Syste m parameter list O Technical data on the TCR O T h ermal head parameters X Transmission Status Report X

Memory Files

Max. number of files: 100 Max. number of stations/file: 142 Max. number of stations overall: 299 Max. number of pages overall: 200 (including pages stored as Auto Documents)

1-4

OVERALL MACHINE INFORMATION November 30th, 1991 COM PONEN T LAYOUT

1.3. COMPONENT LAYOUT

1.3.1. Mechanical Components

16 17

20 21 22 23

6789

1. R2 Rollers Feed the document through the scanner.

2. Exposure Glass Exposes the original to light from the xenon lamp.

3. R1 Rollers Feed the document through the scanner.

4. Separat ion Roller Allows on e page i nto the scann er.

5. Document Feed Roller Feeds the document into the scanner.

6. Pick -up R oller Picks up pages of the document from the document table .

7. Toner Cartridge This supplies toner to the development unit. It is part of the CTM (Cleaning/Toner Magazine).

8. Charge Corona Unit This applies a charge to the master at the start of the print cycle.

9. Quenching L amp This removes excess charge from the master at the end of the print cycle.

10. Thermistor This me asures the temperature in the f using unit.

11 . H ot Roller Hea t from this r oller f uses the toner to the copy paper.

1-5

November 30th, 1991 OVERALL MACHINE INFORMATION

COM PONEN T LAYOUT

12 . H ot Roller Strippers These take the paper off th e hot roller af ter fusing.

13. Copy F eed-out R ollers These feed the paper out of the printer.

14. Pressure Roller (Fusing) This applies pressure to the paper during the fusing process.

15. Cleaning Unit/Used Toner

Tan k

16. Transfe r C orona Unit This applies a charge to the paper to pull the toner off

17. Master Belt Also known as the CS (Compact Seamless) Engine. The

18. Registration R olle r This carries out the registration process.

19. Registration Sens or This dete cts when pape r is approaching the registra tion

20. Development Roller This roller applies toner to the latent image on the

21. Toner Supply Bar This feeds toner to the development roller.

22. Toner Mixing Bar This stirs up the toner in the development unit, so that it

23. Upper Rel ay Rollers The se fe ed paper from the u pper cassette into th e

24. Lower Relay Rollers These feed paper from the lower cassette into the

25. Lower Paper Feed Roller This feeds paper out of the lower cassette.

26. L owe r Paper Se pa ration

Roller

27. Lowe r Paper Pick-up Roller This picks up the t op sheet of paper from the stack in

28. Upper Paper Feed Rollers T hese pick up the top shee t of paper from th e stack in

29. Focusing Lens This focuses the laser beam onto the master belt.

30. Fθ Lenses These ensure that the thickness of the laser beam is

31. He xagonal Mirror This passes the laser beam across the mas ter belt.

32. CCD (Charge Coupled

Device)

This removes excess toner from the master after image transfer and stores it. It is part of the CTM (Cleaning/Toner Magazine).

the master a nd onto the copy paper.

latent image is writte n to this organic photoconductor belt.

roller .

master belt.

does not collect into lumps.

printer .

printer.

This ensure s that only one shee t of paper at a time leave s the lower cassette.

the lower cassette and pas ses it to the f eed roller.

the upper cassette a n d fe ed it into the printer.

uniform across the main scan.

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

1-6

567

OVERALL MACHINE INFORMATION November 30th, 1991 COM PONEN T LAYOUT

1.3.2. Drive Components

1-7

November 30th, 1991 OVERALL MACHINE INFORMATION

COM PONEN T LAYOUT

1. Tx Motor This stepper motor drives the scanne r.

2. R2 Roller This feeds the original through the s canner.

3. Toner Supply Motor This dc motor drives the toner supply mechanism.

4. R1 Roller This feeds the original through the s canner.

5. Shutter Dri ve Gear This ensures that the shutter moves out of th e document feed path at the correct time.

6. Toner Supply Gear (C TM) This ensure s the supply of toner from the CTM into the development unit. It is part of the CTM.

7. Cleaning Brush Drive Gear This drives the cleaning brush in the C TM.

8. Hot Roller This fus es the toner to the copy pape r.

9. Copy Feed-out Roller This feeds printouts out of the machine.

10. Pressure Roller This applies pre ssure t o t he copy paper in t he fusing unit.

11. Registration Roller Drive

Gear

12. Upper Paper Feed Motor This dr ives the paper feed mech anism in the upper

13. Development Roller Drive

Gear

14. Upper Paper Feed Roller

Drive Gear

15. Master Belt Drive Gear This drives the master belt.

16. Paper Feed Clutch This transfers drive from the upper paper feed motor to

17. Toner Supply Gear

(Development)

18. Ma in M otor T his brushless dc motor drives the ma s te r belt, fus ing

19. Lower Paper Feed Motor This drives the paper feed mechanism in the lower

20. Lower Paper Feed Clutch This transfers drive from the lower paper feed motor to

This drives the registration roller.

cassette. This drive s the de velopme nt roller.

This drives the upper paper fee d roller.

the uppe r paper feed mechanis m. This ensure s the collection of toner from the CTM, and

its distribution across the full length of the development unit.

unit, development unit, and cleaning unit.

cassette.

the lower paper fe ed mechanis m.

1-8

OVERALL MACHINE INFORMATION November 30th, 1991 COM PONEN T LAYOUT

1.3.3. Electrical Components

1-9

November 30th, 1991 OVERALL MACHINE INFORMATION

COM PONEN T LAYOUT

Lower Ca ssette

Name Description No.

PCBs

FCU This board controls the machine. 11 MBU This board contains the system ROM and RAM for storing

system parameters such as bit switch settings and programmed

telephone numbers. SBU This board contains the CCD. 1 OP- PORT Th is board controls t he operation panel. 37 NCU This board contains relays and switches for interfacing the

machine to the network and the handset. PSU This board supplies power to the ma chine. 3 LD Unit This board drives the laser diode. 10 PF U T his board controls the lower paper fe ed unit. 4 4

MOTORS

Tx M otor This ste pper motor drives the scanner. 34 Main Motor This dc motor drive s the fusing unit, master belt, dev elopment

roller, and cleaning unit. Upper Paper

Feed Motor Lower Paper

Feed Motor Toner Sup p l y

Moto r Hexagonal Mirror

Motor Ozone F an This removes ozone-laden air from the vicinity of the master unit,

This stepper motor drives the upper paper feed mechanism and

the registra ti on roller.

This stepper motor drives the lower pape r f eed mechanism. 43

This dc motor drives the toner s u pply mechanism. 33

This high-speed dc motor drive s the hexagonal mirror in the

lase r printer optics.

an d filter s out the ozone.

1-10

OVERALL MACHINE INFORMATION November 30th, 1991 COM PONEN T LAYOUT

Name Description No.

CLUTCHES

Upper Paper Feed Clutch

Lower Paper Feed Clutch

SENSORS

Docum ent Sensor This detects the presence of a document in the feeder. 36 Scan Line Se nsor This detects when a page is approaching the auto sha ding

Document Width Sensor

Toner Near-end Sensor

Upper Paper Size Detector

Upper Paper End Sensor

Registration Sensor

Paper Feed-out Sensor

Front Cover Switch

CT M Sensor This detects when a CTM has been ins ta lled in the machine. 27 Lower Paper Size

Detector Lower Paper End

Sensor Lower Paper

Feed Sensor

INT ERLOCK S WITCHES

Front Cover Interlock Switches

OTHERS

Spe aker This allows the user to listen to th e condition of th e telephone

Xenon Lamp This lamp illuminates the document. 35 Xenon Lamp

Driver Charge Corona

and Quenching Lamp Unit

Transfer Corona Unit

Varistor This ensures that the charge given to the master by the charge

Marker This stamps a re d circle on each page that is successf ully f ed

T h i s transfe r s drive from the upper pape r feed motor to the

paper feed roller in the upper cassette.

T h i s transfe r s drive from the lower paper feed motor to the paper

fee d roller in the lower cassette.

position.

This detects when a B4-width [10.1"] document has been placed

in the feeder.

This detects when the toner has almost run out. 17

T h i s de tects th e paper s i ze installed in th e upper cassette. Th e

use r mu st install th e correct actuator.

This detects when the paper in the upper cassette ha s run out. 29

This detects when paper has arrived at the re gis tra tion rollers. 21

This detects when the paper has been fe d out of the printer. 24

This detects wheth er the front cove r is open or closed. 23

T h i s de tects th e paper s i ze installed in th e lower cass ette. T h e

use r mu st install th e correct actuator.

This detects when the paper in the lower cas sette has run out. 3 8

This sensor detects the presence of paper at t he lowe r paper

feed roller.

If the front cover is open, these interlock switches interrupt the

+ 5VLD power supply for the laser diode and the + 24VD power

supply f or t he power pack, motors, and oth er componen t s.

line.

This drives the xenon lamp. 2

The charge corona unit charges the ma s te r belt a t the s ta rt of

the print cycle. The quenching lamp re move s excess charge

from the master belt at the end of the print cycle .

This pulls the toner off the maste r and onto the copy paper. 7

corona wire does not exceed -750 Volts.

through the scanner.

19, 20

1-11

November 30th, 1991 OVERALL MACHINE INFORMATION

COM PONEN T LAYOUT

Name Description No.

Power Pack This s upplies high voltages to the corona wires and the

developme nt bias terminal. F using Lamp This fuses the toner to the paper. 6 Thermistor This monitors the te mperature inside the f us ing unit. 8 Thermostat This inte rrupts the ac power supply to the fusing lamp if the

temperature exceeds 400 °C. Lower Cassette

Indicat or Pane l

T h i s conta i n s indicators to show the sta tu s of th e lower cass ette. 40

1-12

OVERALL MACHINE INFORMATION November 30th, 1991 OVERALL MACHINE CONTROL

1.4. OVERALL MACHINE CONTROL

HandsetLine

SBU

(CCD)

Scanner Sensors

Operation

Panel

NCU

CONTROL SIGNALS

Video Processing

Memory

Video

Processor

Speaker

Modem AFE

CPU

DATA AND ADDRESS BUS

PSU

Port

Scanner and Printer Drive Components and Sensors

FCU

I/O

RS-232C

Interface

Laser

Interface

Page

Memory

SAF

Memory

ECM

Memory

RAMROM

MBU

Laser Diode Driver Main Scan Start Detector Interlock Switch

The cpu on the FCU board controls the machine, as shown in the above drawing.

There is no modem board in the machine. The cpu pe rforms the digital functions of a modem and carries out digital to analog conversion of facsimile data. There is a separate analog modem chip, called the Modem AFE, which does the rest of the modem operations.

1-13

November 30th, 1991 OVERALL MACHINE INFORMATION

VIDEO DATA PATH

1.5. VIDEO DATA PATH

1.5.1. Transmis sion

Original

Reference:

Group 3 Facsimile Manual, section 1-3-1

Xenon

Lamp

ECM

Memory

Line

Buffer

SAF

Memory

RAM

MBU

FIFO

Video

Processor

The fo llowing diag rams show the data path for this model.

There is no programmable resis-

CCD

Analog Signal

FCU

MODEM

AFE

Modem (Digital)

Modem

(Analog)

Network

(via the NCU)

tor in this model.

CPU

To the

1.5.2. Reception

From the

Network

(via the NCU)

Reference:

Group 3 Facsimile Manual, section 1-3-2

Line

Buffer

RAM

MBU

FCU

Memory

SAF

FIFO

Filter

HYBRID IC

Memory

ECM

Page

Memory

Laser Diode

Modem

(Analog)

Modem

(Digital)

CPU

MODEM

AFE

Laser

Interface

Laser Diode

Driver

1-14

Copy Paper

OVERALL MACHINE INFORMATION November 30th, 1991 POWER DISTRIBUTI O N

1.6. POWER DISTRIBUTION

1.6.1. Distribution Diagram

Lower Paper Feed Motor Lower Paper Feed Clutch

+24VD

AC Main

Power

Fusing

Lamp

PSU

AC Switching

Circuit

+24V

-12V

+24VS

+24VD

+5V

Scanner Sensors

+5V

Operation

Panel

+5V

+24VD

Regulator

+5V

+24VD

+5V

PFU

- 12V

+5V +24VS

+24VS

+5V

NCU

FCU

- 5V

+12V

Sensors and

Indicators

FUSING UNIT

Thermistor

+5V

MBU

SAF Memory

+5V

SBU

+12V

+5V

Printer

Sensors

Front Cover

Interlock Switch

Front Cover Microswitch

+5VLD

LDDR

Laser Diode

+24VD

Motors, Clutches, Lamps, Marker, Power Pack

+5V

The laser diode is powered by a special + 5V supply, called + 5VLD. There are two + 24V po wer supplies:

• + 24VS: This is always on when the main switch is on.

• + 24VD: Th is is interrupted if the front cover interlock switch opens.

There is no + 24VD activation sign al from the cpu to the PSU.

1-15

RS-232C

Interface

November 30th, 1991 OVERALL MACHINE INFORMATION

POWER DISTRIBUTI O N

1.6.2. Memory Back-up Circuit

Reference:

Group 3 Facsimile Manual, sect i o n 1-4-3, Circuit type 1

+5V

Voltage

Detector

+24V

[A]

+5V

Switching

Circuit

Regulator

MBU

RAM

1-11

1-9

Battery

Switch

Battery

Switching

Circuit

FCU

17-11

17-9

Real Time

Clock

CPU

Memory Monitor

SAF

Memory

Battery

Switch

[B]

Battery

The battery [A] on the MBU backs up the RAM on the MBU, which contains system parameters. It also backs up the real time clock in the cpu. This battery is not rechargeable. CN1-9 tells the cpu whether the back-up power (CN1-11) comes from the battery or from the + 5V power supply.

A rechargeable battery [B] on the FCU board backs up the SAF memory and the real time clock for 1 hour. While the main power is on, the + 24V supply recharges the battery.

If there is data in the SAF memory, the rechargeable battery [B] also backs up the real time clock, to preserve the MBU battery.

1-16

[A]

DETAILED SECTION DESCRIPTIONS November 30th, 1991 SCANNER

2. DETAILED SE CTION DESCRIPTIONS

2.1. SCANNER

2.1.1. Mechanisms

1. Document Detection

Document Table

Reference:

Group 3 Facsimile Manual, section 2-1-1.

• The scanner is B4-width [10.1"] , with a B4 document width detector [A].

The scanner can feed paper u p to 304 mm [12"] wide. However, only

10.1" of this width will be scanned. The extra width allows users to feed wide originals with wide margins, such as computer form printouts.

• The scanner contains a xenon lamp.

• There is a fold-down extension [B] to suppo rt long d ocuments.

[B]

2-1

[A]

November 30th, 1991 DETAILED SECTION DESCRIPTIONS

SCANNER

Shutter

[C]

[B]

Reference:

Group 3 Facsimile Manual, section 2-1-1.

In standby mode, tab [A] rests on cam [B]. When the tx motor starts, the motor rotates forwards (white arrows), the cam lifts the tab, and the shutter [C] rises. After the last page has been fed through the scanner, the tx motor reverses (black arrows), the cam drops back to the standby position, and the shutter blocks the scanner path again.

2. Pick-up and Feed

Drive Mechanism

Reference:

Group 3 Facsimile Manual, sect i o n 2-2-1.

[A]

[B]

[C]

This ma chine has a Mechanical Clutch Mechanism. The tx motor [A] drives the feed roller [B] and pick-up roller [C].

Resoluti on

Standard - The tx motor fe eds the document at 7 . 7 lines/mm. T he video processor executes

OR processing to convert the data into 3.85 lines/mm. Detail - The tx motor feeds the document at 7.7 lines/mm. There is no OR processing, and the data is transmitted at 7.7 lines/mm. Fine - The tx motor feeds the document and transmits data at 15.4 lines /mm. If the other terminal cannot receive at this re solution, alternate lines of data are deleted, so the effective resolution of the transmitted data is 7.7 lines/mm.

2-2

DETAILED SECTION DESCRIPTIONS November 30th, 1991 SCANNER

Jam Conditions

The cpu detects a document jam if one of the fo llowing conditions occurs.

• Th e scan line sensor do es not switch on within 9 s of the Start key be-

ing pressed.

• The scan line sensor does not turn off after the maximum document

length has been fed since it turned on.

• The scan line sensor switches on while the document sensor is off.

• The document width sensor switches on while the document sensor is

off.

• The scan line sensor does not turn on within 5 s of the end of stamping,

if the document sensor is on.

Separation

Reference: Group 3 Facsimile Manual, section 2-2-2

3. Manual Feed

[B]

[A]

The manual feed button [A] lifts the separation roller [B] out of the doc um ent feed path. There is no manual feed switch.

Reference: Group 3 Facsimile Manual, section 2-2-3

2-3

November 30th, 1991 DETAILED SECTION DESCRIPTIONS

SCANNER

2.1.2. Video Data Processing

Output from the CCD

Auto Shading

Memory

WHITE

WAVEFORM

FEEDBACK

Reference:

Group 3 Facsimile Manual, sect io n 2-3.

Filter

VIDEO

PROCESSOR

Corrected Data from the Auto Shading Circuit

Amplifier

Gamma

Correction,

MTF

A/D

Converter

Data Processing

Circuits

Halftone

Process

Edge

Detection

To the CPU

and Modem

Basic

EDGE

ELEMENTS

Peak Hold

CORRECTED

DATA

Error Diffusion Halftone

Process

Comparator

Background

Detection

Processing

Reduction

NON-EDGE ELEMENTS

Reduction

Halftone

Process Selector

To CPU and Modem

2-4

Image/Text

Detection

B’

DETAILED SECTION DESCRIPTIONS November 30th, 1991 PRINTER

2.2. PRINTER

2.2.1. Mechanisms

1. Master Unit

This printer uses a "write to black" system, using negative toner. The master unit contains a durable OPC master belt. The expected lifetime of

each master unit is about 60,000 copies (this is the target value). Because of this long lifetime, the user is not expected to change the master; there is no Replace Master indicator.

The master belt does not have a bond seam, so no master home position detection is needed. There is also no master unit interlock switch; there is an interlock switch on the front cover.

[A]

[B]

The main motor [A] dr ives the master belt [B].

• At the start of printing, it turns on briefly and the master belt moves un-

der the quenching lamp to ensure that it is fully discharged.

• Then, when the fusing lamp is at the correct temperature and the page

memory contains a complete page of data, and the hexagonal mirror motor is running at the correct speed, the main motor switches on again.

• When the main motor is running at the correct speed, the laser diode

turns on for automatic power control.

Reference: Group 3 Facsimile Manual, section 4-1

2-5

November 30th, 1991 DETAILED SECTION DESCRIPTIONS

PRINTER

2. C harge Corona Unit

[D]

[B]

[E]

[A]

[C]

The charge corona unit [A] gives a -750 V charg e to the master belt. The varistor [B] ensures that the charge does not exceed this value.

The connection between the power pack [C] and the corona unit is not broken when the front cover is opened. However, the front cover interlock switch cuts the + 24V power line to the power pack if the cover is opened.

The charge corona unit contains a wire cleaner [D]. The charge corona switches on at the same time as the laser diode starts its

power control procedure. There is one ozone fan on the right hand side of the machine. It sucks air out

of the mac hine through the ozone filter, which is part of the ozone fan assembly. The ozone fan switches on when a ringing signal is detected, and stays on until the fusing lamp temperature falls back below 130 °C at the end of the printing run.

The inset shows how the grid plate [E] connects to the varistor.

Reference: Group 3 Facsimile Manual, section 4-2

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DETAILED SECTION DESCRIPTIONS November 30th, 1991 PRINTER

3. Laser Optics

[E]

[F]

[B]

[D]

[A]

[C]

The optics are the same as those illustrated in section 4-3-3 of the Group 3 Facsimile Manual, except that there are two mirrors [A] at the "Second Mirror" position.

Other points to note are as follows:

• The focusing lens [B] is a barrel toroidal lens.

• The shield glass [C] pr events toner from entering the laser optics area,

and may need cleaning occasionally.

• An optical fiber [D] p asses the reflected laser beam to the main scan

start detector [E]. This detector is situated on the laser diode drive board [F], unlike shown in the diagram.

• The strength of the b eam is 0.436 mW at a w avelength of 780 nm.

• The dimensions of the dot on the master belt are 65 µm (main scan di-

rection) by 75 µm (sub-scan direction).

The charge on the exposed parts of the belt drops to abo ut -150 V, while nonexposed areas remain at abo ut -750 V.

The laser engine characteristics are as follows (refer to page 4-3-21 of the Group 3 Facsimile manual for background).

• Motor speed: 9,240 rpm

• Motor type: Hexagonal

• LD clock frequency: 5.3311 MHz

• Time between main scan synchronization signals: 1.082 ms

• Number of dots per main scan: 5769

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[A]

November 30th, 1991 DETAILED SECTION DESCRIPTIONS

PRINTER

4. Development

Overview

This machine uses a ’write-to-black’ development system using negative toner.

The toner cassette is part of a disposable unit known as the CTM (Cleaning/Toner Magazine). The CTM contains a toner cassette, toner supply mechanism, cleaning unit, and used toner tank. When the toner is all used up, the CTM is replaced.

Reference: Group 3 facsimile Manual, section 4-4

Toner Supply

[B]

[C]

[E]

[D]

When a new CTM is installed in the machine and the front cover is closed, the main motor and toner supply mo tor turn on. When the front cover is closed, a tab [ A] on the fusing unit cover forces the hopper [B] to open. Also, tab [C] on the CTM pushes bracket [D], which moves the CTM sensor actuator into the sensor.

Continued on the next page

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DETAILED SECTION DESCRIPTIONS November 30th, 1991 PRINTER

[F]

[H]

[I] [J]

[G]

[K]

The toner supply motor [F] drives the toner supply shaft ([E] in the diagram on the previous page). This spiral shaft feeds toner to the hopper.

Inside the development unit is another spiral shaft [G]. This shaft, driven by the main motor, distributes toner across the length of trough [H]. The toner supply motor drives gear [I], and once every rotation, it tips the trough upside down, dropping the toner into the development unit. A spring immediately pulls the trough back upright so that it can continue to receive toner.

The toner m ixing b a r [J], driven b y the main motor, k eeps the toner agitated as it builds up at the bottom of the development unit. The toner supply bar [K] supplies toner to the development roller.

While toner is being supplied, th e main motor is also operating the toner nearend detection mechanism. When a fresh toner cassette is installed, the sensor detects toner near-end, because there is not much toner in the development unit. When some toner has been transferred, the signal from the toner near-end sensor returns to normal. About 22 s after that, the toner supply motor stops and no more toner is transferred into the development unit.

During printing, if toner near-end is detected, the toner supply mechanism will start up again. Toner will be supplied until the sensor signal returns to normal. If the toner cassette in the CTM is empty, no toner will be transferred, and the sensor signal will not return to normal. If the sensor outputs the nearend signal for more than 5 minutes, the cpu blinks the Add Toner indicator. See "Toner Near-en d Detection" fo r more details.

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November 30th, 1991 DETAILED SECTION DESCRIPTIONS

PRINTER

Development Unit Drive

[A]

[B]

During p rinting, d rive from the main motor at gear [A] drives the development roller [B]. The main motor also drives the master belt, so the development roller and the master belt always move at the same time; therefore, no development clutch is needed.

Toner Near-end Detection

The toner near-en d det ection mechanism is exactly the same as described in section 4-4- 4 of the Group 3 Facsimile Manual. The sensor signal is as shown in the following diagram.

Reference:

Group 3 Facsimile Manual, sect i o n 4-4-4.

1.9 s

0.1 ms

The cpu starts to blink the Add Toner indicator under the following conditions:

• At power up: If the sensor output indicates toner near-end for 6 s

• During printing: If the sensor output indicates toner near-end for more

than 5 minutes, totaled over consecutive print runs (when the motor stops, the sensor mechanism is deactivated, so time between printing runs does not count towards the 5 minute time limit)

After 100 more pages have been printed, the Add Toner indicator remains lit, and printing is disabled until a new CTM has been added.

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DETAILED SECTION DESCRIPTIONS November 30th, 1991 PRINTER

Development Bias

[B]

[A]

The development bias and switching bias are supplied from the power pack [A] at the same terminal [B].

• Development bias: - 530 ± 20 Vdc (BIASL)

• Switching bias: + 70 ± 20 Vdc (BIASH)

The switchin g bias is used at the following times :

• Between pages of a print run, while the development bias is off

• While toner is bein g transferred from the CTM to the development unit

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November 30th, 1991 DETAILED SECTION DESCRIPTIONS

PRINTER

5. Paper Feed

There are two cassettes, a 250-sheet cassette, and a 500-sheet cassette. In some models, the 500-sheet cassette is an optional unit.

The sizes of paper that the cassettes can take are listed in the specifications (section 1-1).

[A]

Paper feeds from the rear towards the front. The lower paper feed path bends upward thro u gh the front part of the upper cassette. The two p ap er feed paths merge just before the registration roller [A].

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+ 121 hidden pages

Ricoh FAX2500L SPECIFICATIONS 3000 u

Specifications and Main Features

Frequently Asked Questions

User Manual