Canon FAX-B820 Service Manual
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Canon FAX-B820 Service Manual

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FAX-B820/B822/B840
Service Manual
First Edition
HY8-10B0-000
COPYRIGHT 2004 CANON INC. FAX-B820/B840 082003 XX 0.00-0

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Summary of Contents for Canon FAX-B820

  • Page 1 FAX-B820/B822/B840 Service Manual First Edition HY8-10B0-000 COPYRIGHT 2004 CANON INC. FAX-B820/B840 082003 XX 0.00-0...
  • Page 2 Scope This manual has been issued by Canon Inc., to provide the service technicians of this product with the information necessary for qualified persons to learn technical theory, installation, maintenance, and repair of products. The manual covers information applicable in all regions where the product is sold. For this reason, it may contain information that is not applicable to your region.
  • Page 3 I. MANUAL OUTLINE This manual is divided into three parts, and contains information required for servicing the product. Part 1: Maintenance Information on maintenance and troubleshooting of the product. Part 2: Technical Reference New technology and technical information of the product. Part 3: Appendix Schematic and Specifications.

  • Page 4: Table Of Contents

    II. Table of Contents Part 1: Maintenance Page 1. Maintenance 1 - 1 1 - 1 1.1 Adjustment, Periodic Replacement Parts, Periodic Maintenance, Replacement of Consumables by Service Engineer 1 - 1 1.2 Customer Maintenance 1 - 2 1.3 Product Life 1 - 2 1.4 Special Tools 1 - 2...

  • Page 5: Part 1: Maintenance

    Part 1 Maintenance...

  • Page 6: Consumables By Service Engineer

    1.MAINTENANCE 1.1 Adjustment, Period Replacement Parts, Periodic Maintenance, and Replacement Consumables by Service Engineer Resetting the ink counter (1) Adjustment Item When Purpose Tool When Adjusting gear phase When replacing gear unit To adjust gear phase Resetting the ink counter When replacing NK ABSORBER To reset the ink counter CS pre-scan...

  • Page 7: Product Life

    The value from (I) - (III), whichever comes first. (I)18,000 pages of printing (II)18,000 pages of scanning (III)5 years of use Print CRG (ink tank) Approx. 900 pages of printing *When printing Canon Fax Standard Chart No.1 1.4 Special Tools Name Tool No. Purpose Remarks None 2.

  • Page 8: Errors Shown On Display (Judgment Criterion: Check Diplay)

    Print quality defect Refer to 1-6 page Print is not clear Blurred image or smudged print Stain on the back of printout Inconsistent print quality Head cleaning required Horizontal white streaks in black header Scanning failure (judgment criterion: test print is OK but copy fails) Scanning failure Refer to 1-7 page...
  • Page 9 [CARTRIDGE JAMMED] Printer position correction failure Cause: Carriage does not operate normally, for one of the following reasons. Carriage shaft is broken/ deformed. Broken /deformed parts Or, contact sensor unit does not return from scanning position. Countermeasure: Replace printer assembly or contact sensor unit. [CHECK DOCUMENT] (#001) Cause: PAPER JAM This message appears when the document edge sensor cannot detect the edge of the document after the...

  • Page 10: Errors Not Shown On Display

    [MEMORY FULL] (#037) Cause: A very large document has been received in memory reception and the memory is full. Countermeasure: (1) Print out the document(s) stored in the memory and try the operation again. (2) Delete any unnecessary documents from the memory. Cause: There are too many pages in the transmission document and the transmission memory is full.
  • Page 11 · No sound from speaker (1) Check the connection between the speaker and the SCNT board (J152). (2) Replace the speaker. (3) Replace the SCNT board. 2.3.2 Printing failure Printing failure (ajudgement criterion: copy failure) · Paper not properly fed (ajudgement criteria: check machine) Paper feed motor is not working.
  • Page 12 ·Horizontal white streaks in black header (1) Clean the BJ FAX cartridge five times. Perform a visual check to see whether ink is being properly ejected. (2) Remove the BJ FAXcartridge and then replace it. (3) Replace the BJ FAX cartridge. (4) Check the connection between the carriage ribbon cable and the SCNT board (J251).

  • Page 13: Repair

    3. Repair 3.1 Caution when replacing service parts 3-1-1 Safety Cautions Electrical shock Be sure to disconnect the power cable and modular cable to prevent electrical shock. If working with power on is required, do not use grounding strap. Using such equipment may create conducting pathway, posing a risk of electrical shock.
  • Page 14 3.1.2 General Cautions Damage due to electrostatic discharge This machine contains contact sensors and printed circuit boards that use ROMs, RAMs, custom chips and other electronic components that are vulnerable to damage by electrostatic discharge. Be careful to avoid any damage from electrostatic discharge when conducting service that requires disassembly. *Static electricity warning Electrostatic discharge can destroy electronic components and alter electrical characteristics.
  • Page 15 3.1.3 Prevention of ink soiling Be careful when handling the BJ ink cartridge nozzle, head cap, head wiper and waste ink pad. Residual ink may soil the main unit, working surfaces, your hands and clothes, etc. The ink is water-soluble, but because it contains pigments, it will not wash out of clothes. The ink does not contain any substances that are harmful to humans, but does contain organic solvents (isopropyl alcohol 67-63-0, glycerin 56-81-5 and ethylene glycol 107-21-1).
  • Page 16 3.1.4 Action in the Event of Abnormality (All Clear) In the event of extreme noise or shock, etc., in very rare cases, the display may go out, and all the buttons become inoperable. In that case, perform an All Clear. This operation returns all values and settings to their default settings.
  • Page 17 3.1.5 PRODUCT TRANSPORTATION Please follow procedures below when to transport repaired products. (1) Be sure to attach the BJ cartridge to a carriage unit. (2) Turn off the printer, and secure the carriage locks in the home position. * If the print head is removed from the printer and left alone by itself, ink is likely to dry. For that reason, keep the print head installed in the printer even during transportation.
  • Page 18 (b) Caution about Detaching the Printer Unit from the Main Unit PHOTO 1-2 Detach claw (1) on the right edge of the printer unit from the main unit. PHOTO 1-3 Detach claw (2) from the main unit by lifting the right edge of the printer unit and moving it to the right. 1-13...
  • Page 19 (c) Caution about Detaching the Operation Unit from the Main Unit PHOTO 1-4 Push down the Operation Unit by engaging the cut (1) 1-14...
  • Page 20 3.1.8 Caution about Replacing SCNT Board [1] Caution about the Jumper Switch when Replacing or Repairing SCNT Board Backing up data stored in the control memory is activated by lithium battery with the jumper switch (JP51) mounted on SCNT board being shorted out. If the power goes off with JP51being open, data stored in the control memory is be deleted.
  • Page 21 [2] Please see the following instruction to reset the waste ink counter, to initialize the ink sensor and to perform prescanning whenever SCNT Board is replaced. 1. Press the buttons in the order of [FUNCTION]- [*] - [5]. 2. [TIME SET HH:MM] is displayed. 3.
  • Page 22 3.1.9 Caution about Replacing the Gear Unit PHOTO 1-5 Remove screw (1) and (2). matches Figure 1-2 When attaching the gear unit, check that phase of each gear matches. 1-17...
  • Page 23 3.1.10 Caution about Replacing CS [1] When detaching CS from the main unit: PHOTO 1-6 Unhook spring (1) and (2) and detach CS from the main unit. [2] When attaching CS to the main unit: PHOTO 1-7 Set a strap tying CS cables to the position indicated by an arrow so that mobility of the CS unit will no be affected.
  • Page 24 [3] Follow the procedures below to conduct CS test after replacing CS in the service mode. [16:50 FaxTel] Standby (date and Receive mode display) 1. User data mode selection: Press the Function button. [DATA REGSTRATION] 2. Service data mode selection: Press the [#] button. [#1 SSSW] 3.
  • Page 25 3.1.12 Caution about Replacing Waste Ink Absorber Please perform the following procedure to reset Waste Ink Counter whenever Waste Ink Absorber is replaced. 1. Enter the Service Mode, and then select [TEST MODE]. 2. Press the [Start] button. 3. [TEST MODE [1]-[8]] is displayed. 4.

  • Page 26: Service Switches

    3.2 SERVICE SWITCHES 3.2.1 Hardware switches This machine does not have any hardware switches for service. 3.2.2 Service data settings Service data can be checked and changed according to the displayed menu items. For details of the SSSW/ parameters and default values in this machine, refer to 3-2-5 Service data settings. Details of the SSSW and parameters can be found in ‘G3 Facsimile Service Data Handbook (Rev.0)’.
  • Page 27 3.2.4 Service Data Setting Method Please follow the procedures below to set/register service data. Standby (date and Receive mode display) 03/26 TEL/FAX User data mode selection Press the Function button. DATA REGSTRATION Service data mode selection Press the button. #1 SSSW Menu item selection Select the menu item by pressing the button.
  • Page 28 3.2.5 Service Menu Service data #1 SSSW SW01 (Service soft switch setting) SW02 SW03 SW04 SW05 SW06 SW07 SW08 SW09 Redial/Pause SW10 button SW 11 SW12 SW13 SW14 SW15 SW16 SW17 Coded Dial/ SW18 Directory button SW19 SW20 SW21 SW22 SW23 SW24 SW25...
  • Page 29 Figure 1-6 Service data (page 2) *Nos. 01 to 04 and 08 to 20 are not in use. Please do not change these settings. 1-24...
  • Page 30 #3 NUMERIC PARAM. (Numeric parameter settings) Default Range Not used 10(10 %) (1-99) Not used 15(15 lines) (2-99) Not used 12(12 lines) (1-99) RTN signal transmission condition Not used Not used Not used Not used The number of digits in telephone number compared against TSI signal to bematched for receiving function 5500(55 seconds)
  • Page 31 #3 NUMERIC PARAM. The relationship between the settings and the detection levels is as follows: Parameter 23 0: -26 dBm 1: -30 dBm 2: -32 dBm 3: -35 dBm 4: -38 dBm 5: -41 dBm 6: -43 dBm 7: -45 dBm 8: -47 dBm 9: -51 dBm Parameter 24 0: Not used 1: Not used 2: Not used 3: Not used 4: Not used Parameter 26...
  • Page 32 #4 NCU TONE/PULSE (NCU settings) DIAL TONE 2nd DIAL TONE BUSY TONE 0 BUSY TONE 1 REORDER TONE ROT TAM MU LTI AUTO RX CNG DETECT SPECIAL RKEY PBX DIAL TONE PBX BUSY TONE #5 TYPE EUROPE U. K. (Type setting) SWEDEN SWISS AUSTRIA...
  • Page 33 #6 GENESIS (UHQ) BitSW (Genesis function settings ) SLICE GAMMA #7 PRINTER Printer function settings #8 CLEAR USER SW SERVICE SW SERVICE DATA REPORT EC-xx-xx #9 ROM ROM management TEST MODE Figure 1-9 Service Data(page 5) *If USER SW is selected from #8 CLEAR, the memory management of the user data is not cleared. If TEL or SERVICE is selected, the memory management of the user data is cleared.

  • Page 34: Explanation Of Service Data

    3.3 Explanation of service data SSSW (Service Soft Switch settings) The items registered and set by each of these switches comprise 8-bit switches. The figure below shows which numbers are assigned to which bits. Each bit has a value of either 0 or 1. Figure 1-10 Bit Switch Display As for service switch and default values, please refer to the service data menu.
  • Page 35 #1 SSW SW03 (Service Soft Switch03; Echo countermeasure setting) Bit Function Not in use Echo Protect Tone for Rapid Transmission Transmit Does not transmit* Not in use Not in use TX Mode; International TX (1) No * TX Mode; International TX (2) or International TX (3) No * TX Mode International TX (3)
  • Page 36 International TX (1) International TX (2) International TX (3) * 0 or 1 (depending on each setting) International TX (1) ignores the first DIS signal sent from the other party. International TX (2) sends out the 1850 Hz tonal signal at the same time when the other party sends out DIS signal.
  • Page 37 [Bit 6] It is possible to choose to send out CNG signal when manual TX is set. If the document is sent manually to the machine with [FAX/TEL AUTO SW] mode selected. [Bit 7] It is possible to send out CED signal when manual RX is set. Even if manual RX is set, please choose to send out CED signal when the other party does not start transmitting the document.
  • Page 38 #1 SSSW SW06 (Service Soft Switch06; Setting Scanning Condition) Bit Function Not in use Pre-scan before scanning the document Yes* Limit on Length of Document Less than 1meter * Not in use Not in use Not in use Copy Resolution Selectable Fixed * Not in use...
  • Page 39 SW09 (Service Soft Switch09; Summer time setting) Function Not in use Not in use Not in use Not in use Not in use Not is use Summer time setting Not in use #1 SSSW SW12 (Service Soft Switch12; Page Timer Setting) Bit Function TX Page Timer (When image mode is set to letters)
  • Page 40 Timeout Period of TX and RX 8 minutes 16 minutes 32 minutes 64 minutes TX Timeout Period (Image Mode: Letters) 8 minutes 16minutes 32minutes 64 minutes TX Timeout Period (Image Mode: Other than Letters) 8 minutes 16 minutes 32 minutes 64 minutes RX Timeout Period 8 minutes...
  • Page 41 #1 SSSW SW25 (Service Soft Switch25: Report display Function Settings) Function Transmission telephone Other fax number Called number* numbers display on reports Other party ID display Otherfax ID from Registered ID* on reports Not in use Not in use Not in use Not in use Not in use Not in use...

  • Page 42: Test Function

    3.4 Test Function 3.4.1 User Test Print Function User enabled Test print functions are as follow. 3.4.2 Service Test Functions The fax functions for testing individual operations, such as below. See 3-2-4 Service Data Setting Method. To leave the test mode, press the Function button, and then Clear button. 3.4.3 Test mode overview Test mode can be executed by following the menu items from the display.
  • Page 43 3.4.4 Test mode menu Figure 1-11 Test mode 1-38...
  • Page 44 3.4.5 DRAM test In the test mode menu, press numeric button ‘1’ and select the DRAM test mode. DRAM test 1 writes and reads data into and from all areas of the DRAM and checks that the operation is normal. DRAM test 2 performs data read only, at high speed.
  • Page 45 3.4.6 MODEM, NCU test In the test mode menu, press numeric button ‘3’ and select the MODEM, NCU test. This test runs transmission and reception tests on the modem and NCU. In the MODEM test, listen to the signal sounds from the speaker to check whether the signals output by the modem are correctly transmitted.
  • Page 46 b) G3 signal output test In the MODEM, NCU test menu, press numeric button ‘2’ and the G3 signal output test is selected. A G3 signal is output from the modem via the telephone line connection terminal and the speaker. The transmission speed can be changed using the numeric buttons.
  • Page 47 3.4.7 FACULTY (function) test In the test mode menu, press numeric button ‘4’ and select the FACULTY test. This checks the following functions. Test Description Control panel test Checks whether the control panel buttons are working properly. Sensor test Checks whether the sensors are working properly. a) Control panel test From the FACULTY test menu, press numeric button ‘1’...
  • Page 48 a-2) Control panel button test In this test, the operator presses the button that corresponds to the displayed character. When the button is pressed, the character disappears. The table of characters and buttons is as shown below. Check that all of the characters disappear when the appropriate buttons are pressed. Character Button Character...
  • Page 49 b) Sensor test From the FACULTY test menu, press numeric button ‘2’ and select the sensor test. This test checks whether the sensors are working properly. 1. DS of HOOK on (Displayed OFF or ON) 2. PES of RRP on (Displayed OFF or ON) 3.
  • Page 50 3.4.8 Ink Amount Detection From the TEST mode menu, press numeric button ‘5’ and select the remaining detection test. Test check the following functions. Test Description [1] Remaining ink detection Displays the current ink sensor value and the ink sensor initial registration value.
  • Page 51 3.4.9 Flash memory test Selected FMEM TEST If the flash memory test contains audio data, the LCD display asks whether the data may be deleted. Testing R/W CHEK START! Normal completion Error display Complete (no error) WR= AA RD=33 ADR=2800 Press the START/COPY button to restart.

  • Page 52: Part 2: Technical Reference

    Part 2 Technical Reference...

  • Page 53: New Technology

    1. New Technology Cross-Section Diagram (1) One-path Function This machine employs [One - path] s y stem to use a single roller to pick up the document as well as to separate recording papers. It is possible to load the document and recording papers at the same time.

  • Page 54: Part 3 Appendix

    Part 3 Appendix...

  • Page 55: Schematic

    1. Schematic 3 - 1...

  • Page 56: Specifications

    2. Specifications Fax-B820/B822/B840 Item FAX-B820/B822 FAX-B840 Facsimile Applicable Line PSTN ISDN Others(private line, etc.) Applicable service F Net16Hz (JPN) F Net1300Hz (JPN) DI Service (JPN) Mercury (UK) Econophone (SPAIN) Hong Kong Telephone(HK) DRPD (USA) Caller ID NET SWITCH (Australia) Own Ringing(Fin)
  • Page 57 Fax-B820/B822/B840 Item FAX-B820/B822 FAX-B840 Facsimile Transmission speed Canon Standard Chart 6 seconds (TX) CCITT (ITU-T) No.1 Chart 6 seconds Canon express protocol FAX resolution Transmission(pel/mm×line/mm) 8 × 3.85 , 7.7 Reception(pel/mm×line/mm) 8 × 3.85 , 7.7 Scanning image processing GENESIS / UHQ No.
  • Page 58 Fax-B820/B822/B840 Item FAX-B820/B822 FAX-B840 Printer Printing method Bubble jet Printing resolution 360dpi×360dpi Paper capacity Cassette Cassette siz e Cassette capacity Manual feed Tray Siz e LTR/LGL/A4 Tray Capacity 50 sheets Paper siz e LTR/LGL/A4 Color Printing Printing speed sec/ page...
  • Page 59 Fax-B820/B822/B840 Item FAX-B820/B822 FAX-B840 Dialing/key Telephone Handset Manual 10-key dialing On-Hook key Reception Mode key Automatic dialing One-Touch Speed dialing Coded-Speed dialing Programmable Number of digits 20 average Group dialing Program dialing Dial search Hold key Tone Dialing key Pause key...
  • Page 60 Fax-B820/B822/B840 Item FAX-B820/B822 FAX-B840 Telephone Switch FAX/TEL auto switch Detecting signal Method OGM1 Message Need to record Language Method OGM2 Message Language P-Ci Auto RX w/o ring Built-in answering machine Method Digital Need to record No. of messages 50(include OGM)
  • Page 61 Fax-B820/B822/B840 Item FAX-B820/B822 FAX-B840 Memory capacity 1.6MB Type DRAM Page Canon Standard Chart 120 pages CCITT (ITU-T) No.1 Chart 120 pages Storage Method Depend on receiving mode Option Indicating amount of memory use Memory Back-up Transmission Direct transmission Memory transmission...
  • Page 62 Fax-B820/B822/B840 Item FAX-B820/B822 FAX-B840 Transmission Polling TX Direct Memory Bulletin board function Sequential broadcasting Max. no. of destinations Max. 80 Delayed transmission No. of destinations No. of reservation Batch transmission No. of destinations Time setting Confidential transmission Relay broadcasting command...
  • Page 63 Fax-B820/B822/B840 Item FAX-B820/B822 FAX-B840 Reception Memory reception Page Canon Standard Chart 120 pages CCITT (ITU-T) No.1 Chart 120 pages Alarm Automatic output Memory lock reception Time setting Multiple printing Polling reception Timer polling Confidential mailbox Relay broadcasting Transfer Received image reduction...
  • Page 64 Fax-B820/B822/B840 Item FAX-B820/B822 FAX-B840 Others Use restriction Calling Transmission Printing Reports and lists Activity result report Activity result, phone number, abbr. TX start date, TX period, pages Activity management report Number: 20, phone number, abbr., by TX/RX, TX period, Activity result Memory Clear List RX mode, phone number, abbr., RX date, pages...
  • Page 65 Fax-B820/B822/B840 Item FAX-B820/B822 FAX-B840 Copy Scanning resolution Black & White 8×7.7 pel Color Printing resolution Black & White 360 dpi×360 dpi Color Copy speed Black & White 94.3 sec/pa ge Scanning Scanning resolution 8×7.7 Scanning method Type Sheet Color Scanning document size...
  • Page 66 Fax-B820/B822/B840 Item FAX-B820/B822 FAX-B840 General Power Consumption Maximum 33.1W Standby 3.2W Low Power Consumption Design Method Power Consumption Noise Maximum(Copy) 50db Standby Durability Unit 18,000 Sheets or 5 years Scanning Section 18,000 Sheets or 5 years Printing Section 18,000 Sheets or 5 years...

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