Oki 1000 Service manual

Chapter 0 Front Cover

Okifax 1000 Service Handbook

P/N 59261202

Manual Copyright

This document may not be reproduced without written permission of the Okidata® Technical Training Group. Every effo © 1994 by Okidata All rights reserved. P/N 59261201 First Edition August, 1993 P/N 59261202 First Edition July, 1994 Written and produced by the Okidata Technical Training Group Please address any comments on this publication to: Okidata Technical Training Group 532 Fellowship Road Mount Laurel, NJ 08054-3499 Facsimile Number: (609) 235-2600, ext. 7034 Okilink Login Name: Technical Training

OKIDATA® is a registered trademark of Oki Electric Industry Company, Ltd.; marques deposee de Oki Electric Industry OKIFAX® is a registered trademark of Oki Electric Industry Company, Ltd. Touch-Tone® is a registered trademark of American Telephone and Telegraph

Blank Test & Question Sheet

Answer Sheet: Okifax 1000

Dealer Code: Todays Date: Technicians Name: Company: Companys Address: City: State/Province: Zip/Postal Code: Country: Phone #: Fax #: If your Dealership uses Okilink II, please provide your Dealerships Login Name. First: Last:

A B C D A B C D

1. O O O O 11. O O O O

2. O O O O 12. O O O O

3. O O O O 13. O O O O

4. O O O O 14. O O O O

5. O O O O 15. O O O O

6. O O O O 16. O O O O

7. O O O O 17. O O O O

8. O O O O 18. O O O O

9. O O O O 19. O O O O

10. O O O O 20. O O O O Test: Okifax 1000

1. According to the Okifax 1000 Service Handbook, what is the sequence you should follow

when setting the LED Head Drive Time?

1. Remove the package shelf assembly.

2. Determine the dip switch settings associated with the head intensity rating.

3. Set the dip switches.

4. Look at the last three numbers of the label on the LED head.

5. Assemble the unit. A. 1, 4, 3, 5, and 2

B. 2, 4, 1, 3, and 5 C. 4, 2, 1, 3, and 5 D. 4, 2, 3, 1, and 5

2. The voice answering IC is located on the__________ board.

A. PCNT-150 B. NCU-U C. PSUB-150 D. MCNT-150

3. Where do you check the +38 vdc on the power supply board?

A. CN1, Pins 2,3 and CN2 Pins 1,2 B. CN2, Pins 2,3 and CN4 Pins 1,2 C. CN3, Pins 2,3 and CN2 Pins 1,2 D. CN4, Pins 2,3 and CN2 Pins 1,2

4. Which of the following adjusts the monitor volume of the Okifax 1000?

A. The three position switch on the back of the Okifax 1000 B. User Function 5 C. User Function 11 D. User Function 16

5. Technical Function 27 is the Service Bit. This function must be ON for which of the following?

1. Printing the Protocol Dump Report

2. Printing the Activity Report

3. Resetting the Toner Counter

4. Resetting the Drum Counter

5. Running the Self-Diagnosis Test

6. Resetting the Fuser Counter

7. Modifying the date and time settings. A. 1, 3, 4, and 6

B. 2, 5, 6, and 7 C. 3, 4, 6, and 7 D. 1, 2, 5, and 6

6. According to Appendix A in the Service Handbook, the __________ provides the

high-voltages needed for electrostatic printing. A. power supply unit B. network control unit C. sub-power supply board D. main control board

7. The registration stepper motor and the main stepper motor are interchangeable.

A. True B. False

8. During automatic document feeding, the purpose of the PC2 sensor is to

1. detect the leading edge of the document.

2. detect the presence of a document placed on the ADF.

3. detect the trailing edge of the document.

4. hold back the top originals during multi-feed operations. A. Both 1 and 2

B. Both 2 and 3 C. Both 3 and 4 D. Both 1 and 3

9. Touching the transfer roller may cause incomplete toner transfer, resulting in output with

faded print. A. True B. False

10. The Okifax 1000 comes from the factory with AUTO START set to OFF.

A. True B. False

11. According to the Okifax 1000 Service Handbook, what is the sequence of events during

Automatic Fall-back Mode?

1. The receiving station detects six consecutive error lines during reception of the SECOND page.

2. First transmission occurs at 9600 bps.

3. Transmission speed drops to 7200 bps.

4. The total number of errors (detected by the receiving station) during the reception of the FIRST page exceeds 10% of the data on the page. An RTN signal is sent to the

transmitting

station.

5. The transmitting station receives the second RTN signal and downgrades the transmission speed another level. A. 2, 1, 3, 4, and 5 B. 2, 5, 3, 4, and 1 C. 2, 1, 4, 3, and 5 D. 2, 4, 3, 1, and 5

12. Okidatas information updates are made available through the electronic bulletin board, Okilink II. A. True B. False

13. Before performing ALL DATA CLEAR, Okidata strongly recommends printing the Configuration Report, Service Default Report, and the Telephone Directory Report. By doing this, you will have a record of the customized settings and programmed telephone/facsimile numbers before the system resets. A. True B. False

14. The Okifax 1000 does not allow transmit and receive operations to take place at the same time. However, documents can be prepared for transmission while the unit is engaged in message reception. A. True B. False

15. The line interface impedance for the Okifax 1000 is __________ ohms. A. 300 B. 600 C. 900

D. 1200

16. In No Paper Receive Mode, with the optional 1 megabyte memory card installed, the maximum number of non-ECM pages which can be stored in memory is__________ . A. 108 B. 78 C. 48 D. 248

17. Which of the following statements are true?

1. A PAPER OUTLET JAM occurs when the paper has passed over the paper sensor, but does not pass over the outlet sensor within a pre-determined period of time.

2. If the paper size of the loaded paper differs by + 45 mm or more from the paper size set by the menu, a PAPER SIZE ERROR occurs.

3. A PAPER INLET JAM occurs when the printer is powered ON and paper is at inlet sensor 1 or when the leading edge of the paper fails to reach inlet sensor 1 after hopping is attempted three times.

4. When paper does not pass over the paper sensor within a pre-determined period of time or when the leading edge of the paper does not reach the outlet sensor within a pre-determined period of time after the paper has passed over the paper sensor, a PAPER FEED JAM occurs.

A. 1 and 2 B. 1, 2, and 3 C. 1, 2, 3, and 4 D. None of the above

18. According to the Service Handbook, the Ring Signal Detection Sensitivity can be adjusted through User Function 24 with the optional second tray installed and User Function 23 if the second tray is not installed. A. True B. False

19. The Okifax 1000 you are troubleshooting displays the message PRINTER ALARM 4 [TEL] CONFIRM AND "STOP" Which of the following are true?

1. This message indicates a fuser unit thermal error.

2. The fuser counter needs to be reset.

3. You should refer to RAP 21E to troubleshoot this message.

4. This message indicates a fan motor rotation error. A. 1 and 3

B. 2 and 4 C. 2 and 3 D. 3 and 4

20. Documents should be placed face-down on the automatic document feeder (ADF). A. True B. False

Answer Key // Test Questions with Answers (internal only)

Test: Okifax 1000

1. According to the Okifax 1000 Service Handbook, what is the sequence you should follow when setting the LED Head Drive Time?

1. Remove the package shelf assembly.

2. Determine the dip switch settings associated with the head intensity rating.

3. Set the dip switches.

4. Look at the last three numbers of the label on the LED head.

5. Assemble the unit.

A. 1, 4, 3, 5, and 2 B. 2, 4, 1, 3, and 5 C. 4, 2, 1, 3, and 5 D. 4, 2, 3, 1, and 5 Correct Answer: C Page 3-116, Service Handbook

2. The voice answering IC is located on the__________ board.

A. PCNT-150 B. NCU-U C. PSUB-150 D. MCNT-150 Correct Answer: D Page A-4, Service Handbook

3. Where do you check the +38 vdc on the power supply board?

A. CN1, Pins 2,3 and CN2 Pins 1,2 B. CN2, Pins 2,3 and CN4 Pins 1,2 C. CN3, Pins 2,3 and CN2 Pins 1,2 D. CN4, Pins 2,3 and CN2 Pins 1,2 Correct Answer: C Page A - 8, Service Handbook

4. Which of the following adjusts the monitor volume of the Okifax 1000?

A. The three position switch on the back of the Okifax 1000 B. User Function 5 C. User Function 11 D. User Function 16

Correct Answer: B Page 4-7, Service Handbook

5. Technical Function 27 is the Service Bit. This function must be ON for which of the following?

1. Printing the Protocol Dump Report

2. Printing the Activity Report

3. Resetting the Toner Counter

4. Resetting the Drum Counter

5. Running the Self-Diagnosis Test

6. Resetting the Fuser Counter

7. Modifying the date and time settings.

A. 1, 3, 4, and 6 B. 2, 5, 6, and 7 C. 3, 4, 6, and 7 D. 1, 2, 5, and 6 Correct Answer: A Page 4-54, 4-56, 4-67, 4-70, and 4-74 Service Handbook

6. According to Appendix A in the Service Handbook, the __________ provides the high-voltages needed for electrostatic printing.

A. power supply unit B. network control unit C. sub-power supply board D. main control board Correct Answer: C Page A-18, Service Handbook

7. The registration stepper motor and the main stepper motor are interchangeable.

A. True B. False Correct Answer: B Page 3-20, 3-82, 3-94, B-12, and B-38, Service Handbook

8. During automatic document feeding, the purpose of the PC2 sensor is to

1. detect the leading edge of the document.

2. detect the presence of a document placed on the ADF.

3. detect the trailing edge of the document.

4. hold back the top originals during multi-feed operations.

A. Both 1 and 2 B. Both 2 and 3 C. Both 3 and 4 D. Both 1 and 3 Correct Answer: D Pages 2-10 and 2-18, Service Handbook

9. Touching the transfer roller may cause incomplete toner transfer, resulting in output with faded print.

A. True B. False Correct Answer: A Pages 3-98, 3-1118, and 3-119 Service Handbook

10. The Okifax 1000 comes from the factory with AUTO START set to OFF.

A. True B. False Correct Answer: B Page 28, Operators Guide

11. According to the Okifax 1000 Service Handbook, what is the sequence of events during Automatic Fall-back Mode?

1. The receiving station detects six consecutive error lines during reception of the

2. First transmission occurs at 9600 bps.

3. Transmission speed drops to 7200 bps.

4. The total number of errors (detected by the receiving station) during the reception of the page exceeds 10% of the data on the page. An RTN signal is sent to the transmitting station.

SECOND

page.

FIRST

5. The transmitting station receives the second RTN signal and downgrades the transmission speed another level.

A. 2, 1, 3, 4, and 5 B. 2, 5, 3, 4, and 1 C. 2, 1, 4, 3, and 5 D. 2, 4, 3, 1, and 5 Correct Answer: D Page 2-1, Service Handbook

12. Okidatas information updates are made available through the electronic bulletin board, Okilink II.

A. True B. False Correct Answer: A Page i - 5, Service Handbook.

A. True B. False Correct Answer: A Page 4-78, Service Handbook

14. The Okifax 1000 does not allow transmit and receive operations to take place at the same time. However, documents can be prepared for transmission while the unit is engaged in message reception.

A. True B. False Correct Answer: A Page 2-1, Service Handbook

15. The line interface impedance for the Okifax 1000 is __________ ohms.

A. 300 B. 600 C. 900 D. 1200 Correct Answer: B Page 1-5, Service Handbook

16. In No Paper Receive Mode, with the optional 1 megabyte memory card installed, the maximum number of non-ECM pages which can be stored in memory is__________ .

A. 108 B. 78 C. 48 D. 248 Correct Answer: B Page 16, Operators Guide, Users Documentation

17. Which of the following statements are true?

1. A PAPER OUTLET JAM occurs when the paper has passed over the paper sensor, but does not pass over the outlet sensor within a pre-determined period of time.

2. If the paper size of the loaded paper differs by + 45 mm or more from the paper size set by the menu, a PAPER SIZE ERROR occurs.

when

3. A PAPER INLET JAM occurs when the printer is powered ON and paper is at inlet sensor 1 when the leading edge of the paper fails to reach inlet sensor 1 after hopping is attempted three times.

4. When paper does not pass over the paper sensor within a pre-determined period of time the leading edge of the paper does not reach the outlet sensor within a pre-determined period of time after the paper has passed over the paper sensor, a PAPER FEED JAM occurs.

A. 1 and 2 B. 1, 2, and 3 C. 1, 2, 3, and 4 D. None of the above

Correct Answer: C Pages 2-36, 2-38, 2-39, and 2-40, Service Handbook

A. True B. False Correct Answer: A Page 1-6, Service Handbook Not in Users Doc

19. The Okifax 1000 you are troubleshooting displays the message

PRINTER ALARM 4 [TEL] CONFIRM AND "STOP" Which of the following are true?

1. This message indicates a fuser unit thermal error.

2. The fuser counter needs to be reset.

3. You should refer to RAP 21E to troubleshoot this message.

4. This message indicates a fan motor rotation error.

A. 1 and 3 B. 2 and 4 C. 2 and 3 D. 3 and 4 Correct Answer: A Pages 4-34, Service Handbook

20. Documents should be placed face-down on the automatic document feeder (ADF).

A. True B. False Correct Answer: A Page 2-10, Service Handbook

Chapter 1

1.1.01 General Information

The Okifax 1000 is a Group 3 facsimile unit which utilizes an LED page printer engine to produce a plain paper, permanent copy of received data. The unit can store 85 auto dial locations and has 15 one touch programmable keys. Scanning is accomplished by the direct contact image sensor method. The image sensor consists of 1,728 elements. The Okifax 1000 has a scanning width of up to 8.5 inches.

1.2 General Facsimile Specifications

1.2 GENERAL FACSIMILE SPECIFICATIONS

1.2.01 Style

· Desktop

1.2.02 Compatibility

· CCITT Group 3

1.2.03 Physical Dimensions

· Width

16.1 inches ( Approximately 410 mm)

· Depth

16.4 inches (Approximately 417 mm )

· Height

8.38 inches (Approximately 212.8 mm)

· Weight

26.5 pounds (Approximately 12 kg)

1.2.04 Ambient Temperature and Relative Humidity (RH)

· Operation

50° to 90° F 10° to 30° C 20 to 80% RH

ONLY

· Storage

-20° to 43° C

-4° to 109° F

Temperature Conversion Formulas

F° to C°:

C°= (F°-32) * .5556 C° to F°: F°= (C°* 1.8) +32

1.2.05 Power Requirement

· 115 vac

1.2.06 Power Consumption Mode

Transmit 40W Receive 120W Local Copy (All black) 118W (580W**) Local Copy 125W Standby 35W

Peak Power when the input voltage is 120V.

1.2.07 LCD Display

· 2-line by 20 digit display

Typical Power

1.2.08 Memory

· Standard Memory 256 Kbytes (up to 14 pages of CCITT No.1 Sample Document)

· Optional Expansion Memory 1 Mbyte (up to 64 pages of CCITT No.1 Sample Document)

1.2.09 Copy Mode Resolution

· Fixed at 200 lines per inch

1.2.10 Warm-up Time

· From power On until printer is ready Maximum of 120 seconds

1.2.11 Receive Options

· Auto Receive

· Manual Receive

· Tel/Fax Receive

· Telephone Answering Device (TAD) Mode

· No Paper Receive

· No Toner Receive

1.2.12 Transmit Document Specifications

· Document Width Minimum 5.8 inches Maximum 8.5 inches

· Document Length Minimum 5 inches (single page), 5.8 inches (multi-page document) Maximum 14 inches, or unlimited length for 1 hour

· Document Weight Range 16 pounds to 24 pounds

· Desired opacity Less than 40 % of the scanner source light should be able to pass through the paper.

1.2.13 Automatic Document Feeder (ADF) Capacity

· 30 sheets (20 pound bond)

1.3 Communications

1.3 COMMUNICATIONS

1.3.01 Telephone Line Compatibility

· PSTN (public switched telephone network)

· PBX (private branch exchange)

1.3.02 Communication Mode

· Half Duplex

1.3.03 Protocol

· CCITT Recommendation T.30

· Oki Special Protocol In multi-document reception, the local unit can start transmitting the modem training bits immediately after transmitting end of message (EOM) and upon reception of message confirmation (MCF) from the remote unit, instead of repeating all procedures (which takes about six seconds).

· Oki Special High Speed The T.30 handshake is conducted at message transmission speed (instead of 300 bps) during multi-page transmission.

1.3.04 Line Interface

· Impedance 600 ohms balanced

· Send Power Level 0 dbm to -15 dbm (can be adjusted in 1 dbm steps by modifying TF #21)

1.3.05 Ring Signal Detection Sensitivity

· Voltage Range 25 to 150 r.m.s.

· Frequency Range 15 to 68 Hz (with 44 to 56 volts superimposed)

· Ring Signal Detection Time One Ring Signal or Adjustable between 5 and 30 seconds, in 5 second increments Refer to User Function 24 (optional second tray installed) Refer to User Function 23 (optional second tray NOT installed)

· Ring Signal Voltage Duration Longer than 180 milliseconds (inoperative if duration is 90 milliseconds or less)

1.3.06 Coding Schemes

· Modified Huffman (MH)

· Modified-Modified Read (MMR)

· Modified Huffman (MH)

1.3.07 Error Correction Methods

· CCITT Error Correction Mode (ECM)

· Page Re-transmission (Memory Mode / ECM Off)

1.3.08 High Speed Modem

· CCITT Recommendation V.29 (9600/7200 bps)

· CCITT Recommendation V.27 Ter. (4800/2400 bps)

Only

1.3.09 Low Speed Modem

· CCITT Recommendation V.21 Channel 2 (300 bps)

1.3.10 Transmission Time

· 10 seconds CCITT No. 1 sample document at 9600 bps

1.3.11 Transmit Resolution

· Horizontal 8 PELs per mm (PEL = Picture ELement)

· Vertical STD

3.85 lines per mm or 98 lines per inch FINE

7.7 lines per mm or 196 lines per inch Ex.FINE

15.4 lines per mm or 392 lines per inch

1.3.12 Photo/Half Tone Transmit Resolution

· 32 Levels (using error diffusion)

1.3.13 Ringer Equivalent Number

· 0.68

1.3.14 Transmit Dialing Methods

· Auto Dialing 70 two-digit auto dial codes

· One Touch Dialing 15 one-touch keys)

· Off Hook Dialing

· On Hook Dialing

· Broadcasting Group Dial

1.3.15 Receive Mode

· Auto Receive Dedicated fax machine

· Manual Receive Telephone manual switch to fax mode

· Tel\Fax Auto Switching Telephone will auto switch to fax mode

· TAD Interface

1.3.16 Broadcast Transmit Capabilities

· Maximum: 85 locations in one session

1.3.17 TSI/CSI

· Maximum: 20 characters are displayed. If the function is enabled, the

received TSI is marked at the top of the first reproduced copy.

NOTE: FEDERAL COMMUNICATIONS COMMISSION TELEPHONE CONSUMER PROTECTION ACT

Part 68 Implementation of the Telephone Consumer Protection Act states:

" The Telephone Consumer Protection Act of 1991 makes it unlawful for any person to use a computer or other electronic device to send any message via a telephone fax machine unless such message clearly contains in a margin at the top or the bottom of each transmitted page, or on the first page of the transmission, the date and time it is sent and an identification of the business, other entity, or individual sending the message and the telephone number of the sending machine of such business, other entity or individual."

To comply with this law, the End-User must:

1. Enter the DATE and TIME into the Okifax 1000

2. Enter the NAME and TELEPHONE NUMBER to identify the source

of their facsimile transmission.

1.4 Printer Specifications

1.4 PRINTER SPECIFICATIONS

1.4.01 Print Method

· Development Dry electro-photography

· Exposure Stationary LED head

1.4.02 Print Speed

· Continuous Print 4 sheets per minute (letter size)

· Warm-up Time Power-ON (Cold): approximately 120 seconds Idle: approximately 15 seconds

1.4.03 Receive Paper Sizes

· Letter

8.5 inches x 11.0 inches

· Legal (Option)

8.5 inches x 14.0 inches

1.4.04 Receive Paper Types

· 20 pound Bond Paper

1.4.05 Copy Stacking

· The Okifax 1000 stacks the printed output printed side down. Face-down Stacker Capacity: 100 sheets

1.4.06 Paper Cassette Capacity

· First Cassette 100 sheets

· Second Cassette (Option) 250 sheets

1.4.07 One-Line Minimum Print Time

· Standard Resolution 10 milliseconds per line

· Fine Resolution 5 milliseconds per line

1.4.08 Contrast Selection

· Normal

· Light

· Dark

1.5 User Functions

1.5 USER FUNCTIONS

1.5.0l Transmit Mode

· Auto transmit mode The Okifax 1000 begins sending messages after detecting the remote stations answer.

· Manual transmit mode The operator presses the Start Key after an answer tone has been heard.

1.5.02 Receive Mode

· Auto Receive Mode

· Manual Receive Mode

· Telephone / Fax Automatic Switch

· TAD Interface

1.5.03 Absent Mode Auto Timer

· This feature enables switching to the auto receive mode at a specified time.

1.5.04 Group Dial

· One group of up to 85 locations

1.5.05 Telephone Directory and Location ID

· In addition to telephone numbers, an alphanumeric name can be assigned to

each of the numbers. This alphanumeric name is called the Location ID and can contain up to 15 characters.

1.5.06 Voice Request

· A voice request from the transmitter is available only upon completion of the

total message transmission.

1.6 Scanner Specifications

1.6 SCANNER SPECIFICATIONS

1.6.01 Scanning Method

· 1728 bit contact image sensor

1.6.02 Effective Reading Width

· Maximum: 8.5 inches

1.6.03 Scanning Resolution

· Horizontal 8 PELs per mm (PEL= Picture ELement) - approximately 200 PELs per inch

· Vertical

3.85 lines per mm or 98 lines per inch (STD)

7.7 lines per mm or 196 lines per inch (FINE)

15.4 lines per mm or 392 lines per inch (Ex.FINE)

1.6.04 Automatic Document Feeder

· Maximum 30 sheets of 8.5 x 11 inch, 20 pounds bond paper

NOTE: Documents must be placed face down on the ADF document guide.

1.7 Consumable Items

1.7 CONSUMABLE ITEMS

1.7.01 Toner Cartridge Kit

· Toner Cartridge

· LED Lens Cleaner Pad

1.7.02 Image Drum Cartridge Kit

· Image drum

1.8 Options

1.8 OPTIONS

1.8.01 Letter / Legal / Universal Paper Tray

· 100 sheet capacity

· Adjustable sizing capability (letter, legal, universal)

1.8.02 Second Tray Unit (ST-250)

· 250 sheet capacity

1.8.03 Memory Expansion Kit

· 1 MByte Memory Card

1.9 Agency Approvals

1.9 AGENCY APPROVALS

· FCC Class A

· UL 478 Ver. 5

· CSA 22.2 220

1.10 Reliability Data

1.10 RELIABILITY DATA

1.10.01 Automatic Document Feeder Jam Rate

· Approximately one for every 500 operations

1.10.02 Separation Rubber Life

· Approximately 10,000 document feeds

1.10.03 Lithium Battery Life

· Approximately 5 years

1.10.04 Image Drum Life

· One page print jobs Up to 11,000 pages

· Continuous print Up to 20,000 pages

1.10.05 Toner Cartridge Life

· First toner cartridge in image drum Up to 1,250 pages

· Subsequent toner cartridges Up to 2,500 pages

1.10.06 Estimated Fuser Life

· Approximately 180,000 pages

1.10.07 Facsimile Mean Time Between Failure (MTBF)

· Approximately 3,000 hours

1.10.08 Printer Duty Cycle

· Approximately 6,000 pages per month

1.10.09 Estimated Printer Life

· Approximately 180,000 pages

1.10.10 Mean Time To Repair (MTTR)

· Approximately 30 minutes

Chapter 2

2.1 Principles Of Operation

2.1 PRINCIPLES OF OPERATION

The Okifax 1000 Principles of Operation section is comprised of three sub-sections.

· Transmitter Theory of Operation

· Receiver Theory of Operation

· LED Printer Theory of Operation

2.1.01 Compatibility

The Okifax 1000 facsimile machine operates as a Group 3 (G3) facsimile device.

2.1.02 Communications Mode

The Okifax 1000 operates as a half-duplex facsimile transceiver. Transmit and receive operations cannot take place at the same time. However, documents can be prepared for transmission while the Okifax 1000 is engaged in message reception. These documents will be automatically transmitted upon completion of the receiving operation.

2.1.03 Modem Operation

The high-speed modem conforms to CCITT Standard V.29 for 9600/7200 bps (bits per second) operation and to CCITT Standard V.27 ter. for 4800/2400 bps operation.

The low-speed (300 bps) modem, which is used for handshaking, conforms to CCITT standard V.21 channel 2 or equivalent.

2.1.04 Automatic Fall-Back Mode

2.1.04 Automatic Fall-back Mode

The Okifax 1000 will change the message transmitting speed according to the following fall-back plan. The Okifax 1000 will first transmit a page of the message at 9600 bps. The receiving station will continuously monitor the received data. If the receiving station detects six or more consecutive error lines during reception of a single page, or if the total number of errors detected during the reception of a single page exceeds 10% of the data on the transmitted page, it will return an RTN (Retrain Negative) signal to the transmitting station upon termination of the page reception. With an RTN signal received, the transmitting station will downgrade its speed by one level (to 7200 bps in this case) and continue transmission of the next page. Similarly, should the transmitting station again receive an RTN signal from the receiving station, it will downgrade speed another level.

2.1.05 Telephone Line Connection

The Okifax 1000 is connected to the telephone line via the LINE-JU Board. Two RJ-11 connectors are provided; one for connection to the phone line, and the other for an external telephone. A separate modular jack is provided for connection of the Okifax 1000s handset.

The Okifax 1000 will control the switching between the handset (or the external telephone) and the telephone line to permit use of the handset or telephone for voice communication.

2.1.06 Error Correction Mode (ECM)

The Okifax 1000 features Error Correction Mode (ECM). When communicating with a remote unit that also has ECM, this feature provides error-free transmission.

What follows is an explanation of how ECM works.

· The transmit machine groups image data into blocks and transmits one block of data at a time to the receive machine. At the end of each block, a PPS (Partial Page Signal) is transmitted.

· The receive machine stores the data block in memory and checks each frame within that block for errors.

- Modified Huffman assigns a binary code to consecutive recurring bits of white or black.

The codes must add up to a total of 1728 bits, which is the Main Scan Rate established by CCITT.

- Modified Read uses a comparison technique. The line being coded is compared to

the previous line and differences are noted. Codes are then assigned to reflect the differences between the two lines.

· If no errors are detected, the receiver sends MCF (Message Confirmation) which requests the transmit machine to transmit the next data block.

· If an error is detected by the receive machine, it transmits the frame number of the defective frame back to the transmit machine in a signal called PPR (Partial Page Request).

· The transmit machine will then re-transmit the frame to the receive machine as a Partial Page.

· The receive machine rechecks the Partial Page, and (if all frames are correct) the receive machine transmits MCF (Message Confirmation).

· The next data block is then transmitted.

+ 260 hidden pages

Oki 1000 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual