Ricoh FAX500, FAX550 Service Manual 500550 [U]

FAX500/ 550

SERVICE M ANUAL

Throug hout this manual, the machines are
referred to as follows.

Type A: FAX500
Type B: FAX550

Lithium Batteries (Memory Back-up)
CAUTION:

The danger of explosion exists if a battery of this type is incorrectly rep laced.
Replace only with the same or an equivalent type recommended by the
manufacturer. Discard used batteries in accordance with the manufacturer’s
instructions.

CONTENTS

1. OVERALL MACHINE INFORMATION

1.1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . 1-1

1.2. FEATURES . . . . . . . . . . . . . . . . . . . . . 1-2

1.3. COMPONENT LAYOUT . . . . . . . . . . . . . . . . 1-5

1.3.1. Mechanical Components . . . . . . . . . . . . . . 1-5

1.3.2. Drive Components . . . . . . . . . . . . . . . . . 1-6

1.3.3. Electrical Compon ents . . . . . . . . . . . . . . . 1-7

1.4. OVERALL SYSTEM CONTROL . . . . . . . . . . . . . 1-9

1.5. VIDEO DATA PATH . . . . . . . . . . . . . . . . . . 1-10

1.5.1. Transmission . . . . . . . . . . . . . . . . . . . 1-10

1.5.2. Reception . . . . . . . . . . . . . . . . . . . . 1-10

1.6. POWER DISTRIBUTION . . . . . . . . . . . . . . . . 1-11

1.6.1. Distribution Diagram . . . . . . . . . . . . . . . . 1-11

1.6.2. Memory Back-up Circuit . . . . . . . . . . . . . . . 1-12

2. DETAILED SECTION DESCRIPTIONS

2.1. SCANNER . . . . . . . . . . . . . . . . . . . . . . 2-1

2.1.1. Mechanisms . . . . . . . . . . . . . . . . . . . 2-1

1. Document Detection . . . . . . . . . . . . . . . . . 2-1

2. Pick-up and Feed . . . . . . . . . . . . . . . . . . 2-2

2.1.2. Video Data Processing . . . . . . . . . . . . . . . 2-3

2.2. PRINTER . . . . . . . . . . . . . . . . . . . . . . 2-4

2.2.1. Mechanisms . . . . . . . . . . . . . . . . . . . 2-4

1. Paper Feed . . . . . . . . . . . . . . . . . . . . 2-4

2. Cutting . . . . . . . . . . . . . . . . . . . . . . 2-5

3. Cutter Jam Detection . . . . . . . . . . . . . . . . 2-5

2.2.2. Circuits . . . . . . . . . . . . . . . . . . . . . 2-6

1. Video Data Processing . . . . . . . . . . . . . . . . 2-6

2. Thermal Head . . . . . . . . . . . . . . . . . . . 2-6

2.3. PCBs AND THEIR FUNCTIONS . . . . . . . . . . . . . 2-7

2.3.1. FCU . . . . . . . . . . . . . . . . . . . . . . 2-7

2.3.2. MBU . . . . . . . . . . . . . . . . . . . . . . 2-9

2.3.3. SBU . . . . . . . . . . . . . . . . . . . . . . 2-10

2.3.4. OPU . . . . . . . . . . . . . . . . . . . . . . 2-10

2.3.5. NCU . . . . . . . . . . . . . . . . . . . . . . 2-11

2.3.6. PSU . . . . . . . . . . . . . . . . . . . . . . 2-12

3. INSTALLATION

3.1. CONNECTING UP THE MACHINE . . . . . . . . . . . . 3-1

3.2. INITIAL PROGRAMMING . . . . . . . . . . . . . . . 3-2

4. SERVICE TABLES AND PROCEDURES

4.1. SERVICE LEVEL FUNCTIONS . . . . . . . . . . . . . 4-1

4.1.1. Bit Switch Programming (Function 91) . . . . . . . . . 4-1

4.1.2. System Parameter List (Function 92) . . . . . . . . . . 4-1

4.1.3. Error Code Display (Function 93) . . . . . . . . . . . 4-2

4.1.4. Service Monitor (Function 93) . . . . . . . . . . . . . 4-2

4.1.5. Protocol Dump (Function 94) . . . . . . . . . . . . . 4-2

4.1.6. RAM Display/Rewrite (Function 95) . . . . . . . . . . 4-3

4.1.7. RAM Dump (Function 95) . . . . . . . . . . . . . . 4-3

4.1.8. NCU Parameters (Function 96) . . . . . . . . . . . . 4-4

4.1.9. ADF Test (Functio n 97) . . . . . . . . . . . . . . . 4-4

4.1.10. Xenon Lamp Test (Function 97) . . . . . . . . . . . 4-5

4.1.11. DTMF Tone Test (Function 97) . . . . . . . . . . . . 4-5

4.1.12. Printer Test Patterns (Function 97) . . . . . . . . . . 4-6

4.1.13. Operation Panel Test (Function 97) . . . . . . . . . . 4-6

4.1.14. Modem Test (Function 97) . . . . . . . . . . . . . 4-7

4.1.15. Ringer Test (Function 97) . . . . . . . . . . . . . . 4-8

4.1.16. Buzzer Test (Function 97) . . . . . . . . . . . . . . 4-8

4.1.17. Sensor Initialization (Function 97) . . . . . . . . . . . 4-8

4.1.18. Serial Number (Function 98) . . . . . . . . . . . . . 4-9

4.1.19. Pulse Width (Function 99) . . . . . . . . . . . . . . 4-9

4.1.20. Bypassing Restricted Access . . . . . . . . . . . . 4-10

4.1.21. Printing all Memory Files . . . . . . . . . . . . . . 4-10

4.2. BIT SWITCHES . . . . . . . . . . . . . . . . . . . . 4-11

4.3. NCU PARAMETERS . . . . . . . . . . . . . . . . . . 4-21

4.4. DEDICATED TRANSMI SSION PARAMETERS . . . . . . . 4-27

4.4.1. Programming Procedure . . . . . . . . . . . . . . 4-27

4.4.2. Parameters . . . . . . . . . . . . . . . . . . . . 4-28

4.5. USEFUL RAM ADDRESSES . . . . . . . . . . . . . . 4-30

4.6. SPECIAL TOOLS AND LUBRICANTS . . . . . . . . . . . 4-31

5. REPLACEMENT AND ADJUSTMENT

5.1. COVERS . . . . . . . . . . . . . . . . . . . . . . 5-1

5.1.1. Top Co ver . . . . . . . . . . . . . . . . . . . . 5-1

5.1.2. Front and Rear Covers . . . . . . . . . . . . . . . 5-1

5.2. SCANNER . . . . . . . . . . . . . . . . . . . . . . 5-2

5.2.1. ADF Clutch and Pick-up and Feed Rollers . . . . . . . . 5-2

5.2.2. Separation Roller . . . . . . . . . . . . . . . . . 5-3

5.2.3. Tx Motor . . . . . . . . . . . . . . . . . . . . . 5-4

5.2.4. Timing Belt Tension Adjustments . . . . . . . . . . . 5-4

5.2.5. Xenon Lamp . . . . . . . . . . . . . . . . . . . 5-5

5.2.6. Xenon Lamp Driver . . . . . . . . . . . . . . . . . 5-5

5.2.7. SBU . . . . . . . . . . . . . . . . . . . . . . 5-6

5.2.8. SBU Adjustments . . . . . . . . . . . . . . . . . 5-6

5.3. PRINTER . . . . . . . . . . . . . . . . . . . . . . 5-10

5.3.1. Rx Motor . . . . . . . . . . . . . . . . . . . . . 5-10

5.3.2. Thermal Head . . . . . . . . . . . . . . . . . . 5-10

5.3.3. Cutter . . . . . . . . . . . . . . . . . . . . . . 5-11

5.4. PCBs . . . . . . . . . . . . . . . . . . . . . . . . 5-12

5.4.1. FCU and Battery . . . . . . . . . . . . . . . . . . 5-12

5.4.2. Memory . . . . . . . . . . . . . . . . . . . . . 5-12

5.4.3. MBU . . . . . . . . . . . . . . . . . . . . . . 5-13

5.4.4. PSU and NCU . . . . . . . . . . . . . . . . . . . 5-14

5.4.5. Operation Panel . . . . . . . . . . . . . . . . . . 5-14

6. TROUBLESHOOTING

6.1. COPY QUALITY TROUBLESHOOTING . . . . . . . . . . 6-1

6.1.1. Received Copies . . . . . . . . . . . . . . . . . . 6-1

6.1.2. Copies made in Copy Mode . . . . . . . . . . . . . 6-1

6.2. MECHANICAL PROBLEMS . . . . . . . . . . . . . . . 6-2

6.2.1. ADF/Scanner . . . . . . . . . . . . . . . . . . . 6-2

6.2.2. Printer . . . . . . . . . . . . . . . . . . . . . . 6-5

6.3. ERROR CODES . . . . . . . . . . . . . . . . . . . 6-7

6.4. DEFECTIVE SENSOR TABLE . . . . . . . . . . . . . . 6-1 3

OVERALL MACHINE INFORMATION November 30th, 1991
SPECIFICATIONS

1. OVER ALL MACHINE INFORMATIO N

1.1. SPECIFICATIONS

Type

Desktop transceiver

Modulation

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

1

Circuit

PSTN, PABX

Connection

Direct couple

Document Size
Length: 105 - 1200 mm

[4.13 - 47.2 ins]
Up to 100 m [328 ft] after adjustment
Width: 148 - 216 mm

[5.8 - 8.5 ins]
Thickness: 0.05 to 0.15 mm

[2 to 6 mils]

Document Feed

Automatic feed, face down

ADF Capacity

20 sheets (using 20 lb paper)
30 sheets (using 80 g/m

Scanning Method

Flat bed, with CCD

Maximum Scan Width

216 mm [8.5 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 - 128 kbytes (7 pages), shared

w/ ECM
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 EC M

2

paper)

Protocol

Group 3 with ECM

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

Thermal printing, automatic cutter

Pap er Size

216 mm (A4) x 100 m [8.5 ins x 328 ft]

Maximum Printout Width

210 mm [8.3 ins]

Ma ximu m Printer Resoluti o n
Main scan: 8 dots per mm [203 dpi]
Sub scan: 15. 4 lines/mm [392 lpi]

Power Supply

115 ± 20 Vac, 60 ± 1 Hz

Power Consumption
(Without Optional Kits)
Standby: 13 ± 5 W
Transmit: 29 ± 5 W
Receive: 22 ± 5 W
Copying: 41 ± 7 W

Operating Environment
Temperature: 17 - 28 °C [63 - 82 °F]
Humidity: 30 - 85 %Rh

Dimensions (W x D x H)

325 x 388 x 174 mm [12.8 x 15.3 x 6.9 ins]
Excluding handset, trays, and optional units

Weight

10 kg [22 lbs]

1-1

November 30th, 1991 OVERALL MACHINE INFORMATION

FEATURES

1.2. FEATURES

KEY:

O = Used, X = Not Used,
A = Type A only,
B = Type B and Type B with optional me m ­ory only,
C = Type B with optional memory only

Equipment

ADF O
Bar code reade r X
Built-in handset X
Cabinet X
Connection for ans. machine O
Connection for handset O
Cutter O
Handset O
Hard disk X
Magnetic card reader X
Manual f eed mechanism X
Marker X
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 - 8 x 3.85 to 8 x 7 . 7 O
Smoothing - 8 x 7.7 to 8 x 15 . 4 X

Communication Features - Auto

Automatic fallback O
Automatic redialing O
Confidential reception C
Dual Acce ss B
Substitute r ecepti on O
Transmission Reserve A

Communication Features -

User Selectable

Action as a transfer broadcaster X
AI Redial O
Alternative Destination O
Answering machine O
Authorize d Reception O
Auto-answer dela y time X
Auto dialing (pulse or DTMF) O
Auto Documen t B
Automatic Voice Message X
Auto-note X
Batch Transmission (max 5 files) C
Broadcasting O
Chain Dialing O
Confidential ID O v erride O
Confidential Transmission O
Forwarding (4 stations) C
Fre e Polling O
Gr oups (7 groups) O
Hold O
Immediate Redialing O
Immediate transmission (this is

the default mode for Type A)
Keystr oke Program s O
Mailbox C
Memory transmission (this is the

default mode for Type B)
Notify X
On Hook Dial O
Page Count O
Per sonal Codes O
Personal Codes with Conf ID C
Polling R eception O
Polling Transmission O
Quick Dial (Type A: 15, Type B: 30)
Reception mode s (Fax, Te l, Auto) O
Reduction X
Remote control features O
Remote Transfer B
Restricted Access (10 codes,

without cards)
Secured Polling O
Secured Polling with Stored ID

Override

O

O

O

O

1-2

OVERALL MACHINE INFORMATION November 30th, 1991
FEATURES

Send Later O
Silent ringing detection O
Speed Dial (Type A: 50, Type B: 100)
Telephone Directory B
Tonal Signal Transmission O
Transfer Request

A: 19 stations (f rom memory), 20
stations (immediate)
B: 30 stations

Transmission Deadline X
Turnaround Polling X
Voice Request O

Communication Features -

Service Selectable

AI Short Protocol X
Auto-reduction override option X
Bus y tone detection O
Close d network (tx and 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 X
Polling tx file lifetime in the SAF B
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 X
Ce n ter mark X
Checkered mark X
Clea ring a memory file O
Clea ring a polling file O
Clock O
Confidential ID C
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

O

Language Selection O
LCD contrast control S ervice
Memory L ock C
Memory L ock ID C
Modifying a memory file X
Mu lti So rt Document Rece p t ion X
Multicopy m ode X
Night Timer X
Own t elephone number O
Printing a memory file O
RDS on/off O
R eception Mode Switching Ti mer O
Reception Time (non- memory rx

only)
Re mote ID O
R everse Order Printing X
RTI, TTI, CSI O
Speaker volume control O
Specified Cassette S election X
Substitute r ecepti on on /of f 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 C
Error Report O
Memory Storage Report O
Mode Chan ge Report X
Polling Clea r Report B
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 Reception List O
Charge Control Report X
File L is t O
Forwarding List C
Gr oup List O

O

1

1-3

November 30th, 1991 OVERALL MACHINE INFORMATION

FEATURES

Reports - User-initiated

Per sonal Code List O
Program List O
Quick Dial List O
Specified Cassette Selection List X
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 equaliz er (rx only) O
Comm. par ameter display O
DTMF tone test O
Echo countermeasure O
Error code display O
LCD contrast control 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 O
Serial number programming O
Service m onitor repor t O
Serv ice s tation number X
Syste m parameter list O
Technical data on the TCR O
T h ermal head parameters O
Transmission Status Report X

Memory Files
Type A Models

Max. number of files: 10
Max. number of stations/file: 20
Max. number of stations overall: 21
Max. number of pages overall: 64
(including pages stored as Auto
Documents)

Type B Models

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 LAY O UT

1.3.1. Mechanical Components

123456 78 9 10 11

19

18

1

121317 16 15 14

1. R2 Rollers Feed the document through the scanner.

2. Exposure Glass E xposes the original to light from the xenon lamp.

3. Xenon Lamp Illuminates the document.

4. R1 Rollers Feed the document through the scanner.

5. Separation Roller Allows one page into the scanner .

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

7. Separation P lat e Spreads out the leading edges of the pages fed into the
scanner.

8. Pick-up Roller Picks up pages of the document from t he document
table .

9. Lens Block Focuses light reflected from the document onto the
CCD.

10. CCD (Charge Coupled

Device)

11. Thermal Paper Roll Thermal paper for printing.

12. Shading Plate Allows more light through from the ends of the xenon

13. Second Mirror Reflects light from the document towards the CCD.

14. Thermal Head P rints received data on the therma l paper.

15. Platen Roller Feeds the pa per through the printer.

16. Cutter Cuts off the printed page.

17. Feed-out R ollers Feed out the page which has been cut off.

18. First Mirror Reflects light from the document towards the CC D.

19. Third Mirror Ref l ects light from the document towards the CCD.

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

lamp than from the center, to counteract the r elative
dimness at the ends of the lamp.

1-5

November 30th, 1991 OVERALL MACHINE INFORMATION

COM PONEN T LAYOUT

1.3.2. Drive Components

12 34 5 6

10

9

8

7

1. R2 Roller Drive Gear Drives the R2 roller.

2. Scanner Drive Gear Tr ansfers drive from the Tx moto r to the
scanner and ADF.

3. R1 Roller Drive Gear Drives the R1 roller.

4. Document Feed Idle

Gear

5. ADF

Clutch/Document

Transfers drive from the Tx motor to the
document feed roller.
Drive the document feed roller, which feeds
the document into the scanner.

Feed Drive Gear

6. Tx Motor Drives the ADF and scanner.

7. Rx Motor Drives the printer.

8. Printer Drive Gears Transfer Rx motor drive to the p rinter.

9. Platen Roller Drive

Gear

10. Feed-out Roller Drive
Gear

Drives the platen roller, which pulls the
thermal paper through the printer
Drives the feed-out roller, which feeds the
printed copy out of the machine.

1-6

2

4

11

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

1.3.3. Electrical Components

1

23

22

21

20

3

5

6

1

19

18

17

16

15

14

13

9

10

12

7

8

Name Description No.

PCBs

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

8
for storing system parameters such as bit switch
settings and programmed telephone numbers.

SBU This board co ntains the CCD. 10
OP-PORT This board controls the operation panel. 23
NCU This board c ontains relays and switches for

4
interfacing the machine to the telephone network
and the handset.

PSU This board sup plies power to the machine. 7
Xenon Lamp

This supplies power to the xenon lamp. 14

Driver

MOTORS

Tx Motor This drives the scanner. 5
Rx Motor This drives the printer. 6
Cutter Motor This drives the cutter. 1

1-7

November 30th, 1991 OVERALL MACHINE INFORMATION

COM PONEN T LAYOUT

Name Description No.

CLUTCHES

ADF Clutch This transfers drive fr om the tx motor to the

3
document feed roller.

SENSORS

Document Sensor This detects the presence of a document in the

22
feeder.

Scan Line Sensor This detects when a page is approaching th e

21
auto shading position.

Trailing Edge Sen­sor

This detects when the trailing edge of t he page is
passing the scan line.

20

Paper End Sensor This detects when the thermal paper has run out. 16
Printer Jam Sen-

This detect s jams in the printer. 18

sor
Cutter Sensor This monitors the operation of the cutter. 2
Cover Switch This detects whether the cover is open or closed. 15

OTHERS

Thermal Head This prints on the thermal paper. 17
SAF Memory Mod­ules (Type B mod-

These memory modu les each contain 1 Mbyte of
memory for storing fax messages.

9

els only)
Speaker This allows the user to listen to the condition of

12
the telephone lin e.

Xenon Lamp This lamp illuminates the document. 19
Battery (Type B
models only)

This rechargeable battery backs up the SAF
memory when the main power is switched off.

13

1-8

OVERALL MACHINE INFORMATION November 30th, 1991
OVERALL SYSTEM C O NTROL

1.4. OVERALL SYSTEM CONTROL

HandsetLine

1

SBU

(CCD)

Scanner

Sensors

Operation

Panel

NCU

CONTROL SIGNALS

Video Processing

Memory

Video

Processor

Speaker

Modem AFE

CPU

PSU

Port

Scanner and Printer Drive
Components and Sensors

Thermal

Head

I/O

RS-232C

Interface

DATA AND ADDRESS BUS

SAF

Memory

RAMROM

ECM

Memory

FCU

MBU

The cpu on the FCU board controls the ma chine, as shown in the above drawing.
There is no modem board in the machine. The cpu performs the digital functions of a modem

and carries out digital to analog conversion of facsimil e data. There is a s epara te analog mo­dem chip (called the Modem A FE) which does the rest of the modem operations.

Type A models - This machine does not contain SAF memory. T he EC M me mory doubles as
a small SAF memory. Batte ry back-up for this memory is disabled when the memory conta i n s
ECM data.

1-9

November 30th, 1991 OVERALL MACHINE INFORMATION

VIDEO DATA PATH

1.5. VIDEO DATA PATH

1.5.1. Transmission

Reference:

Group 3
Facsimile
Manual,
section
1-3-1

Xenon

Lamp

ECM

Memory

Line

Buffer

Original

SAF

Memory

RAM

FIFO

CCD

Analog Signal

Video

Processor

The fo llowing diagrams show
the data path for this model.

There is no pro­grammable resis­tor in this model.

CPU

Modem
(Digital)

MODEM

AFE

FCU

Modem

(Analog)

1.5.2. Reception

Reference:

Group 3
Facsimile
Manual,
section
1-3-2

MBU

From the

Network

(via the NCU)

Line

Buffer

RAM

FCU

SAF

Memory

FIFO

Filter

HYBRID IC

Memory

ECM

Thermal

Head

Modem

(Analog)

Modem

(Digital)

CPU

I/O Port

To the

Network

(via the NCU)

MODEM

AFE

MBU

Thermal

Paper

1-10

OVERALL MACHINE INFORMATION November 30th, 1991
POWER DISTRIBUTION

1.6. POWER DISTRIBUTION

1.6.1. Distribution Diagram

Motors, ADF Clutch
Xenon Lamp

+24VD

NCU

+5V

Thermal

+24VD

Head

+5V

+5V

+5V

+24VS

FCU

+5V

+5V

MBU

RS-232C

Interface

1

+5V

SBU

+12V

+5V

OPU

+5V

Scanner
Sensors

PSU

Printer

Sensors

+24VS

+24VD

-12V

+5V

+12V

Regulator

+24VS

+24VD

Regulator

- 5V

- 12V

The PSU supplies power to the machine through the FCU, except for the ther­mal head power, which it supplies directly. The FCU contains regulators
which generate other voltages needed by the machine.

There are two + 24V power supplies:

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

• + 24VD: This is switched on by the cpu when a ringing signal is de-

tected, or when the user presses the Start or Copy key. It is not inter­rupted if the cover s witch is opened ; however, printing stops and th e
document is fed out.

In some documentation for this model, + 24VD may sometimes be referred
to as + 24VA.

1-11

November 30th, 1991 OVERALL MACHINE INFORMATION

POWER DISTRIBUTION

1.6.2. Memory Back-up Circuit

+5V

Voltage

Detector

Switching

Circuit

MBU

RAM

1-11 1-11

FCU

Reference:

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

+24V

5-1

[A]

+5V

Regulator

5-2

1-9

Battery

Switch

Battery

Switching

Circuit

1-9

Real Time

Clock

CPU

Memory

Monitor

SAF

Memory

ECM

Memory

[C]

Battery

[B]

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 supply.

Type A models only - Power from a charged capacitor [B] backs up the
ECM memory on the FCU, only if it is being used as a small SAF memory.
Type B models only - A rechargeable battery [C] backs up the SAF memory
and the real time clock for 1 hour. When the main power is switched on, the
+ 24V supply charges the battery. If there is data in the SAF, the battery also
backs up the real time clock, to preserve the MBU battery.

1-12

ADF Clutch

DETAILED SECTION DESCRIPTIONS November 30th, 1991
SCANNER

2. DETAILED SECTION DESCRIPTIONS

2.1. SCANNER

2.1.1. Mechanisms

1. Document Detection

Trailing Edge
Sensor

Scan Line Sensor

2

Document
Sensor

Separation
Plate

Feed
Roller

• The machines in this ser ies have an A4-width [8.3"] scanner. There is

Separation Rolle r

Pick-up Roller

no document width detector.

• The scanner contains a xeno n lamp.

• Th ere is no shutter mechanism.

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

2-1

November 30th, 1991 DETAILED SECTION DESCRIPTIONS

SCANNER

2. Pick-up and Feed

Mechanism

Refere nce :

Group 3
Facsimile
Manual,
secti on 2-2

Tx Motor

• This machine uses an electrical clutch mechanism with trailing edge sen-

ADF Clutch

sor.

• There is no manual feed.

Resolution
Standard - The tx moto r feeds the document at 7.7 lines/mm. The vid e o

proc essor executes OR pro cessing to convert the data into 3.85 lines/mm.
Detail - The tx motor feeds the docu ment at 7.7 lines/mm. There is n o 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 resolution, the tx motor feeds the
paper at 7.7 lines/mm, and the data is transmitted using Detail resolution.

Jam Conditions

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

• The scan line sensor does not switch on within 3.5 s of the Star t key be-

ing pressed.

• The scan line sensor does not tu rn o ff after th e maximum docum e nt

length has been fed since it turned on.

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

2-2

DETAILED SECTION DESCRIPTIONS November 30th, 1991
SCANNER

2.1.2. Video Data Processing

Output from the CCD

A

Auto Shading

Memory

WHITE

WAVEFORM

FEEDBACK

Peak

Hold

DATA

DC

Filter

Amplifier

A/D

Converter

CORRECTED

Data Processing

Circuits

2

VIDEO

PROCESSOR

Reference: Group 3
Facsimile Manual,
sect io n 2-3

Comparator

Background

Detection

OR

Processing

To the CPU
and Modem

Corrected Data from the Auto Shading Circuit

Gamma

Correction,

MTF

Edge

Detection

Reduction

Halftone

Basic

Halftone

Process

EDGE

ELEMENTS

NON-EDGE
ELEMENTS

Error

Diffusion

Halftone
Process

Image/Text

Detection

Reduction

A

B

Process Selector

To CPU and Modem

2-3

B’

November 30th, 1991 DETAILED SECTION DESCRIPTIONS

PRINTER

2.2. PRINTER

2.2.1. Mechanisms

1. Paper Feed

Mechanis m

One-way Clutch

Feed-out
Roller

Platen Roller

Refere n ce:

Group 3
Facsimile
Manual,
section
3-4-1

Rx Motor

The printer is an A4-width [8.3"] printer.

Resolution
Standard - Each received line is printed 4 times

Detail - Each received line is printed twice
Fine - Each received line is printed once.

2-4

DETAILED SECTION DESCRIPTIONS November 30th, 1991
PRINTER

Jam Detection

The cpu detects a copy jam if one of the following conditions occurs:

• If the printer jam sensor still does not detect paper after the minimum

cop y length has been fed since the start of printing.

• Between pages of a multipage printout, the printer jam sensor switches

off. A jam is detected if the sensor does not switch back on after the
minimum copy length has been fed since it turned off.

• If the printer jam sensor still detects paper after the end of the feed-out

procedure for the last page of a print run.

2. Cutting

Cutter
Blade

2

Reference:

Group 3
Facsimile
Manual,
secti o n 3-6

Cutter
Sensor

Cutter
Motor

The cutter mechanism is exactly as described in section 3-6 of the Group 3
Facsimile Manual.

3. Cutter Jam Detectio n

A cutter jam is detected if one of the following conditions occurs:

• If the cutter sensor do es not open within 0.25 s after the cutter starts to

move

• If the cutter sensor stays open for more than 1.0 s

If a cutter jam is detected, the cutter motor reverses to return the cutter to the
standby position.

2-5

November 30th, 1991 DETAILED SECTION DESCRIPTIONS

PRINTER

2.2.2. Circuits

1. Video Data Processing

• Smoothing is as described in section 3-5-1 of the Group 3 Facsim ile

Manual

• There is no reduction.

2. Thermal Head

Both machines use an A4-width [8.3"] thermal head. Refer to sec tion 3- 5- 2 of
the Group 3 Facsimile Manual for a circuit diagram.

The operation of the thermal head is as explained in the Group 3 Facsimile
Manual, except that when printing a line, blocks 0 and 1 are printed together,
then blocks 2 and 3 are printed together.

The data are p rinted as exp lained in section 3-5-3 of the Group 3 Facsimile
Manual. In Fine mode, the pulse width is automatically increased by 50%.

The machine prevents overheat protection by adjusting the pulse width in ac­cord ance with the temperature measured by the thermistor on the thermal
head.

Reference: Group 3 Facs imile Man ual, s ectio ns 3-5-1, 3-5-2, and 3-5-3.

2-6

DETAILED SECTION DESCRIPTIONS November 30th, 1991
PCBs AND THEIR FUNCTIONS

2.3. PCBs AND THEIR FUNCTIONS

2.3.1. FCU

HandsetLine

SBU

(CCD)

Scanner

Sensors

Operation

Panel

Speaker

Modem AFE

CONTROL SIGNALS

Video Processing

Memory

Video

Processor

NCU

CPU

HIC

PSU

FCU

I/O

Port

Scanner and Printer Drive
Components and Sensors

2

Drivers

Thermal

Head

RS-232C

Interface

MBU

DATA AND ADDRESS BUS

Memory Back-up

Control

SAF

Memory

ECM

Memory

RAMROM

2-7

November 30th, 1991 DETAILED SECTION DESCRIPTIONS

PCBs AND THEIR FUNCTIONS

1. CPU (AFSP)

• 65C02 compatible microprocessor

• Interrupt control

• DMA control

• Data compression and reconstruction (high speed MH coding for 4.5-

second scanning)

• Modem (digital operations)

• Real time clock (battery backed-up)

• Memory control

• Control of all mechanisms (directly or through other chips)

• NCU control (through the I/O Port)

2. I/ O Port (LIOP)

• Clock control

• Sensor monitoring (including A/D conversion where necessary)

• Tone detection

• Thermal head control

• Tx/Rx/cutter motor drive control

• Operation p anel control

3. Modem Analog Front End (Modem AFE)

• Modem (analog operations)

• Attenuati on

4. Video Processor (VPP)

• Analog/digital video signal processing

5. Driver (MFPD)

• Tx/Rx/cutter motor drive

6. Driver Array

• Xenon lamp/ADF clutch drive

7. Hybrid IC (HIC)

• Gain control for rx data

• Filters

8. RAM
Type A Models

• 128k used for ECM (no back-up) or SAF (bac ked up by a cap acitor)

Type B Models

• 128k for ECM (no back-up)

• 256k SAF memory (with battery back-up)

2-8

DETAILED SECTION DESCRIPTIONS November 30th, 1991
PCBs AND THEIR FUNCTIONS

2.3.2. MBU

System

ROM

DATA AND ADDRESS BUS

Memory Back-up

Control

+

To/From

FCU

1. System ROM

• Contains the software to run the machine

MBU

2

System

RAM

To/From

FCU

2. System RAM
Type A Models

• 32k SRAM for parameter storage, line buffer, FIFO

Type B Models

• 32k SRAM and 32k PSRAM for parameter storage, line buffer, FIFO,

SAF memory administration

The SRAM is backed up by the battery on the MBU

Note: The MBU for the Type A model is not interchangeable with the MBU

for the Type B mod el.

2-9