Panasonic KX-FT72BR-G Service Manual
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Panasonic KX-FT72BR-G Service Manual

Panasonic KX-FT72BR-G Service Manual

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KX-FT72BR-G
(for Brazil)
© 2001 Kyushu Matsushita Electric Co., Ltd. All
rights
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distribution is a violation of law.
.ORDER NO. KMF0112524C3
Personal FAX
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Summary of Contents for Panasonic KX-FT72BR-G

  • Page 1 .ORDER NO. KMF0112524C3 Personal FAX KX-FT72BR-G (for Brazil) © 2001 Kyushu Matsushita Electric Co., Ltd. All rights reserved. Unauthorized copying distribution is a violation of law.

  • Page 2: Table Of Contents

    KX-FT72BR-G CONTENTS Page Page 1 INTRODUCTION 5 CIRCUIT OPERATIONS 1.1. LCD MESSAGE 5.1. CONNECTION DIAGRAM 1.2. SAFETY PRECAUTIONS 5.2. GENERAL BLOCK DIAGRAM 1.3. INSULATION RESISTANCE TEST 5.3. CONTROL SECTION 1.4. FOR SERVICE TECHNICIANS 5.4. FACSIMILE SECTION 1.5. BATTERY CAUTION 5.5. SENSORS AND SWITCHES 1.6.

  • Page 3: Introduction

    KX-FT72BR-G 1 INTRODUCTION 1.1. LCD MESSAGE...

  • Page 4: Safety Precautions

    KX-FT72BR-G 1.2. SAFETY PRECAUTIONS 1. Before servicing, unplug the AC power cord to prevent an electric shock. 2. When replacing parts, use only the manufacturer´s recommended components. 3. Check the condition of the power cord. Replace if wear or damage is evident.

  • Page 5: Ac Caution

    KX-FT72BR-G 1.6. AC CAUTION For safety, before closing the lower cabinet, please make sure of the following precautions. (1) The earth lead is fixed with the screw. (2) The AC connector is connected properly. (3) Wrap the Earth Lead lead around the core 4 times.

  • Page 6: Features

    KX-FT72BR-G 1.7.2. LIVE ELECTRICAL SECTIONS All the electrical sections of the unit supplied with AC power by the AC power cord are live. Never disassemble the unit for service with the AC power supply plugged in. 1.8. FEATURES General Integrated Telephone System •...

  • Page 7: Specifications

    KX-FT72BR-G 1.9. SPECIFICATIONS Applicable Lines: Public Switched Telephone Network Document Size: Max. 216 mm (8 1/2”) in width Max. 600 mm (23 5/8”) in length Effective Scanning Width: 208mm (8 3/16”) Recording Paper Size: 216 mm max. 30 m (8 1/2”×98”) roll Effective Printing Width: 208 mm (8 3/16”)

  • Page 8: Test Chart

    KX-FT72BR-G 1.11. TEST CHART 1.11.1. ITU-T NO.1 TEST CHART...
  • Page 9 KX-FT72BR-G 1.11.2. CCITT NO. 2 TEST CHART...

  • Page 10: Location Of Controls

    KX-FT72BR-G 1.12. LOCATION OF CONTROLS 1.12.1. OVERVIEW...
  • Page 11 KX-FT72BR-G 1.12.2. CONTROL PANEL • • To initiate or exit programming . RECEIVE MODE • • To change the receive mode. NAVIGATOR, VOLUME • • To adjust volume. STOP • • To stop an operation or cancel programming. • • To search for a stored name.

  • Page 12: Connections

    KX-FT72BR-G 1.13. CONNECTIONS (1) Connect the handset cord. (2) Connect the telephone line cord. (3) Connect the power cord. NOTE When you operate this products, the power outlet should be near the product and easily accessible.

  • Page 13: Installation

    KX-FT72BR-G 1.14. INSTALLATION 1.14.1. INSTALLING THE RECORDING PAPER Open the cover by pressing the cover open button and install the recording paper roll. • • If the paper is secured with glue or tape, cut approximately 15 cm (6 inches) from the beginning of the roll.
  • Page 14 KX-FT72BR-G 1.14.2. SETTING YOUR LOGO The logo can be your company, division or name. Press Display:Refer to LCD MESSAGE (P.3) Press Press until the following is displayed. Press . Enter your logo, up to 30 characters, by using the dial keypad.
  • Page 15 KX-FT72BR-G 1.14.3. TO SELECT CHARACTERS WITH THE DIAL KEYPAD Pressing the dial keys will select a character as shown below. 1.14.4. TO SELECT CHARACTERS USING Instead of pressing the dial keys, you can select characters using Press until the desired character is displayed.
  • Page 16 KX-FT72BR-G 1.14.5. SETTING THE DIAL LOCK The dial lock feature prevents the unit from calls being made to any numbers, except for pre-stored emergency telephone numbers. Press Display: Press Enter yor PIN(Personal dentification Number) code, from 2 to 4 digits, using 0-9.
  • Page 17 KX-FT72BR-G 1.14.6. DOCUMENTS YOU CAN SEND Note: • • Remove clips, staples or other similar fasteners. • • Check that ink, paste or correction fluid has dried. • • Do not send the following types of documents:(Use copies for fax transmission.) —...

  • Page 18: Maintenance Items And Component Locations

    KX-FT72BR-G 1.15. MAINTENANCE ITEMS AND COMPONENT LOCATIONS 1.15.1. OUTLINE MAINTENANCE AND REPAIRS ARE PERFORMED USING THE FOLLOWING STEPS. 1. Periodic maintenance Inspect the equipment periodically and if necessary, clean any contaminated parts. 2. Check for breakdowns Look for problems and consider how they arose.
  • Page 19 KX-FT72BR-G 1.15.2.1. MAINTENANCE LIST OPERATION CHECK REMARKS Document Path Remove any foreign matter such as paper. — Rollers If the roller is dirty, clean it with a damp cloth then dry See CLEANING (P.20) thoroughly. Thermal Head If the thermal head is dirty, clean the printing surface See CLEANING (P.20) and...
  • Page 20 KX-FT72BR-G 1.15.3. CLEANING 1.15.3.1. DOCUMENT FEEDER If misfeeding occurs frequently or if dirty patterns or black bands or white bands appear on a copied or transmitted document or the original of a copied document, clean the document feeder. Disconnect the power cord and the telephone line cord.

  • Page 21: Troubleshooting Guide

    KX-FT72BR-G 2 TROUBLESHOOTING GUIDE 2.1. TROUBLESHOOTING SUMMARY 2.1.1. TROUBLESHOOTING After confirming the problem by asking the user, troubleshoot according to the instructions and observe the following precautions. 2.1.2. PRECAUTIONS 1. If there is a problem with the print quality or the paper feed, first check if the installation space and the print paper meets the specifications, the paper selection lever/paper thickness lever is set correctly, and the paper is set correctly without any slack.

  • Page 22: User Recoverable Errors

    KX-FT72BR-G 2.2. USER RECOVERABLE ERRORS If the unit detects a problem, the following messages will appear on the display. Refer to LCD MESSAGE (P.3) DISPLAY MESSAGE CAUSE AND SOLUTION • • There is something wrong with the unit. Contact our service personnel.
  • Page 23 KX-FT72BR-G 2.2.1. DOCUMENT JAMS (SENDING) If the unit does not release the document during feeding, remove the jammed document as follows. Open the cover by pressing the cover open button. Remove the jammed document carefully. Pull leading edge recording paper approximately 10 cm (4 inches) out of the unit.
  • Page 24 KX-FT72BR-G 2.2.2. RECORDING PAPER JAM If the unit dose not eject any recording paper during fax reception or copying, the recording paper has jammed. Remove the jammed paper as shown below. Open the cover by pressing the cover open button and remove the recording paper roll.

  • Page 25: Troubleshooting Details

    KX-FT72BR-G 2.3. TROUBLESHOOTING DETAILS 2.3.1. OUTLINE Troubleshooting guide provides a logical path of deduction to assist in locating a fault and suggests methods of restoring the unit to full working condition. Use the reported symptoms of the fault to determine the best troubleshooting method. Even difficult faults can be tracked to a specific block or area, for example, the "Digital Board"...
  • Page 26 KX-FT72BR-G 2.3.3. TROUBLESHOOTING ITEMS TABLE FUNCTION SYMPTOM REFERENCE Printing Skewed receiving image See SKEWED RECEIVING IMAGE (P.32) Expanded print See EXPANDER PRINT (WHEN PRINTING) (P.33) Image is distorted See IMAGE IS DISTORTED (WHEN PRINTING) (P.31) Black or White vertical lines appear.
  • Page 27 KX-FT72BR-G 2.3.4. ADF (AUTO DOCUMENT FEED) SECTION 2.3.4.1. NO DOCUMENT FEED CROSS REFERENCE: DIGITAL BOARD SECTION (P.56) POWER SUPPLY BOARD SECTION (P.67) SENSOR SECTION (P.72) TEST FUNCTIONS (P.82) DISASSEMBLY INSTRUCTIONS (P.84)
  • Page 28 KX-FT72BR-G 2.3.4.2. DOCUMENT JAM CROSS REFERENCE: SENSOR SECTION (P.72) DISASSEMBLY INSTRUCTIONS (P.84)
  • Page 29 KX-FT72BR-G 2.3.4.3. MULTIPLE FEED CROSS REFERENCE: DISASSEMBLY INSTRUCTIONS (P.84)
  • Page 30 KX-FT72BR-G 2.3.4.4. SKEW CROSS REFERENCE: DISASSEMBLY INSTRUCTIONS (P.84)
  • Page 31 KX-FT72BR-G 2.3.4.5. IMAGE IS DISTORTED (WHEN PRINTING) CROSS REFERENCE: READ SECTION (P.73) THERMAL HEAD SECTION (P.74) TEST FUNCTIONS (P.82) DISASSEMBLY INSTRUCTIONS (P.84)
  • Page 32 KX-FT72BR-G 2.3.4.6. BLACK OR WHITE VERTICAL LINES APPEAR CROSS REFERENCE: DIGITAL BOARD SECTION (P.56) TEST FUNCTIONS (P.82) 2.3.4.7. SKEWED RECEIVING IMAGE...
  • Page 33 KX-FT72BR-G 2.3.4.8. EXPANDER PRINT (WHEN PRINTING) CROSS REFERENCE: DISASSEMBLY INSTRUCTIONS (P.84) 2.3.4.9. WHEN COPYING OR PRINTING, AN ABNORMAL SOUND IS HEARD FROM THE UNIT...
  • Page 34 KX-FT72BR-G CROSS REFERENCE: DISASSEMBLY INSTRUCTIONS (P.84)
  • Page 35 KX-FT72BR-G 2.3.5. COMMUNICATION SECTION Find the problem in the table shown below, and refer to the corresponding troubleshooting procedure in DEFECTIVE FACSIMILE SECTION (P.36). Symptom Content Possible cause The paper is not fed properly when faxing. Troubleshooting Problem with the feeding (Copying is also not possible.)
  • Page 36 KX-FT72BR-G 2.3.5.1. DEFECTIVE FACSIMILE SECTION 2.3.5.1.1. TRANSMIT PROBLEM CROSS REFERENCE: LCD MESSAGE (P.3) ADF (AUTO DOCUMENT FEED) SECTION (P.27) OPERATION BOARD SECTION (P.71) SENSOR SECTION (P.72)
  • Page 37 KX-FT72BR-G 2.3.5.1.2. SOMETIMES THERE IS A TRANSMIT PROBLEM CROSS REFERENCE: LCD MESSAGE (P.3)
  • Page 38 KX-FT72BR-G 2.3.5.1.3. RECEPTION PROBLEM Confirm the following before starting troubleshooting. Is the recording paper installed properly? There is the receiving problem when sometimes the below errors may be occurred. (Refer to LCD MESSAGE (P.3)) OUT OF PAPER CHECK COVER UNIT OVERHEATER(If it doesn´t return automatically, COVER OPEN, etc., reset the unit.) CHECK DOCUMENT Please refer to USER RECOVERABLE ERRORS (P.22) for the above items.
  • Page 39 KX-FT72BR-G 2.3.5.1.4. THE UNIT CAN COPY, BUT CANNOT TRANSMIT/RECEIVE...
  • Page 40 KX-FT72BR-G 2.3.5.1.5. UNIT CAN COPY, BUT CANNOT TRANSMIT/RECEIVE LONG DISTANCE OR INTERNATIONAL COMMUNICATIONS The following 2 causes can be considered for this. Cause 1: The other party is executing automatic dialling, the call has been received by this unit, and the CED or DIS signal response time is too long.
  • Page 41 KX-FT72BR-G (Causes and Countermeasures) Countermeasure Side Echo Communication Problem Example Countermeasure Service Code Sending side Some time is needed to compare the level Add a dummy signal to the beginning Service code (521) of the receiving and sending signals for the of the training signal.
  • Page 42 KX-FT72BR-G Fig. c (Countermeasure by Changing the Interval Between CED and DIS) Fig. d (C3ountemeasure by Ignoring the 1st DIS) <TX side signal> <RX side signal> <Countermeasure> 2nd / 3rd DCS / Training & delayed CFR / FTT at TX side 2nd / 3rd EOP / EOM / MPS &...
  • Page 43 KX-FT72BR-G 2.3.5.1.7. HOW TO RECORD FAX SIGNAL BY USING PC Recording FAX signal is one of the useful analysis measures to solve communication problems. The way of recording easily by using PC is shown as follows. 1. Equipment Parts No.
  • Page 44 KX-FT72BR-G 2.3.5.1.8. HOW TO OUTPUT THE JOURNAL REPORT 1. Press three times. 2. Press 3. Press until the “ JOURNAL REPORT ” is displayed. 4. The report is printed out. Error code table: (1) CODE (2) RESULT (3) MODE SYMPTOM...
  • Page 45 KX-FT72BR-G...
  • Page 46 KX-FT72BR-G CROSS REFERENCE: TEST FUNCTIONS(P.82)
  • Page 47 KX-FT72BR-G CROSS REFERENCE: TEST FUNCTIONS(P.82)
  • Page 48 KX-FT72BR-G...
  • Page 49 KX-FT72BR-G CROSS REFERENCE: TEST FUNCTIONS(P.82) CROSS REFERENCE: TEST FUNCTIONS(P.82)
  • Page 50 KX-FT72BR-G...
  • Page 51 KX-FT72BR-G...
  • Page 52 KX-FT72BR-G CROSS REFERENCE: TEST FUNCTIONS(P.82)
  • Page 53 KX-FT72BR-G 2.3.5.2. REMOTE PROGRAMMING If, after the call is connected, the customer describes the situation and it is determined that the problem can be corrected by making parameter changes, this function makes it possible to change parameters such as the user code and service code from another fax (using DTMF tones).
  • Page 54 KX-FT72BR-G 2.3.5.2.2. PROGRAM MODE TABLE Code Function Set Value Default Remote setting Set the date and time dd/mm/yy hh:mm --------- Your logo --------- --------- Your fax number --------- --------- Print transmission report 1:ERROR / 2:ON / 3:OFF ERROR Auto receive mode...
  • Page 55 KX-FT72BR-G Code Function Set Value Default Remote setting Transmit journal report 1: START --------- Journal 3 1: START --------- Transmit service list 1: START --------- OK : Can set the value by the remote programming feature or print a list.
  • Page 56 KX-FT72BR-G 2.3.6. DIGITAL BOARD SECTION One of most difficult problems to deal with is when the system will not boot up. The symptom: No response when the power is turned on. (No LCD display, keys are not accepted.) Note: 1. Electrical continuity may have existed at the factory check, but a faulty contact occurred as a result of vibration, etc., during transport.
  • Page 57 KX-FT72BR-G 2.3.6.1. DIGITAL BLOCK DIAGRAM The signal lines that must be normal for the system to boot up are listed here [List 1]. For signal lines other than these, even if they malfunction they do not directly affect booting up the system.
  • Page 58 KX-FT72BR-G...
  • Page 59 KX-FT72BR-G Normal Wave Patterns...
  • Page 60 KX-FT72BR-G For these reasons and the software sequence to boot up the unit, if you use an oscilloscope to judge whether a signal is OK or NG, you must check in the same order as in [List 1]. (If the ASIC (CPU) failed to access the ROM, the ASIC cannot access the SRAM normally.)
  • Page 61 KX-FT72BR-G CROSS REFERENCE: NG EXAMPLE (P.63) CHECK THE STATUS OF THE DIGITAL BOARD (P.64)
  • Page 62 KX-FT72BR-G CROSS REFERENCE: CHECK THE STATUS OF THE DIGITAL BOARD (P.64)
  • Page 63 KX-FT72BR-G 2.3.6.2. NG EXAMPLE...
  • Page 64 KX-FT72BR-G 2.3.6.3. CHECK THE STATUS OF THE DIGITAL BOARD Put the unit in the test mode and check the voltage at lands A, B, C and D.
  • Page 65 KX-FT72BR-G 2.3.7. ANALOG BOARD SECTION The analog parts check is actually different than the digital parts check. The signal route is determined by the purpose of the check. For example, the handset TX route begins from the handset microphone and is output in the telephone line. In this route, it is mainly an analog signal.
  • Page 66 KX-FT72BR-G 2.3.7.2. DEFECTIVE ITS (INTEGRATED TELEPHONE SYSTEM) SECTION...
  • Page 67 KX-FT72BR-G 2.3.8. POWER SUPPLY BOARD SECTION 1. Key components for troubleshooting The following components have been known to break frequently: F101, D101-D104, C106, Q101, PC101. This comes from our experience with experimental tests. For example: power supply, lightning surge voltage test, withstanding voltage test, intentional short circuit test, etc.
  • Page 68 KX-FT72BR-G 2. Troubleshooting Flow Chart...
  • Page 69 KX-FT72BR-G...
  • Page 70 KX-FT72BR-G 3. Broken parts repair details (D101, D102, D103, D104) Check for a short-circuit in terminal 4. If D101, D102, D103 and D104 are short-circuited, F101 will melt (open). In this case, replace all of the parts (D101, D102, D103, D104, F101).
  • Page 71 KX-FT72BR-G 2.3.9. OPERATION BOARD SECTION 2.3.9.1. NO KEY OPERATION CROSS REFERENCE: TEST FUNCTIONS (P.82) 2.3.9.2. NO LCD INDICATION CROSS REFERENCE: TEST FUNCTIONS (P.82)
  • Page 72 KX-FT72BR-G 2.3.10. SENSOR SECTION Refer to SENSORS AND SWITCHES (P.118) for the circuit descriptions. Refer to LCD MESSAGE (P.3). 2.3.10.1. CHECK THE DOCUMENT SENSOR (PS1)...."REMOVE DOCUMENT" 2.3.10.2. CHECK THE READ POSITION SENSOR (PS2)...."CHECK DOCUMENT"...
  • Page 73 KX-FT72BR-G 2.3.11. READ SECTION Refer to SCANNING BLOCK (P.112).
  • Page 74 KX-FT72BR-G 2.3.12. THERMAL HEAD SECTION Refer to THERMAL HEAD (P.110). CROSS REFERENCE: SUPERVISION CIRCUIT FOR THE THERMAL HEAD TEMPERATURE (P.107) THERMAL HEAD (P.110)

  • Page 75: Programming And Lists

    KX-FT72BR-G 2.4. PROGRAMMING AND LISTS The programming functions are used to program the various features and functions of the machine, and to test the machine. Programming can be done in both the on-hook and off-hook conditions. This facilitates communication between the user and the service while programming the machine.
  • Page 76 KX-FT72BR-G 2.4.3. USER MODE (The list below is an example of the SYSTEM SETUP LIST the unit prints out.) Note: The above values are the default values.
  • Page 77 KX-FT72BR-G 2.4.4. SERVICE FUNCTION TABLE Code Function Set Value Effective Range Default Remarks Setting the pause time 001~600 X 100 msec 001~600 Selects the pause time in 100 msec steps. Setting the flash recall time 01~99 X 10 msec 01~99 Selects the line break time during flashing in 10 msec steps.
  • Page 78 KX-FT72BR-G Code Function Set Value Effective Range Default Remarks Setting an acceptable 001~999 X number of 001~999 Sets the number of acceptable error lines when reception error value times the FAX reconstructs the received data. Setting the transmit level - 21~00...
  • Page 79 KX-FT72BR-G 2.4.5. SERVICE MODE SETTINGS (Example of a printed out list)
  • Page 80 KX-FT72BR-G 2.4.6. OTHER [HISTORY] Display Function DATA Date and time which are set by a user for the first time after purchase. TIME is the expiration from the first power on after purchase. KEY OPERATION Indicate 2-digit codes. (Refer toBUTTON CODE TABLE (P.83).1st.50: History of the key operation from 1st to 50th after purchase.
  • Page 81 KX-FT72BR-G 2.4.7.1. JOURNAL 3 Descriptions: 1. ENCODE Compression Code: MH/MR 2. MSLT MSLT means Minimum Scan Line Time. Used only at the factory. 3. RESOLUTION (RESOL) Indicates the resolution of the communication. If multiple pages are transmitted or received, it indicates the last page´s resolution.

  • Page 82: Test Functions

    KX-FT72BR-G 2.5. TEST FUNCTIONS Test Mode Type of Mode Code Function Operation after code input PRINT TEST Service Mode “8” “5” Prints a test pattem and checks the thermal head for abnormalities (missing dots, etc), and also checks the operation of the reception motor.(Refer to JOURNAL START 3(P.81).)
  • Page 83 KX-FT72BR-G 2.5.1. DTMF SINGLE TONE TRANSMIT SELECTION When set to ON (=1), the 12 keys and transmission When set to OFF (=2), the 12 keys and transmission frequencies are as shown. frequencies are as shown. High Frequency (Hz) Low Frequency (Hz)

  • Page 84: Disassembly Instructions

    KX-FT72BR-G 3 DISASSEMBLY INSTRUCTIONS 3.1. HOW TO REMOVE THE HANDSET CRADLE CABINET, HOOK BUTTON AND SPEAKER...

  • Page 85: How To Remove The Operation Block

    KX-FT72BR-G 3.2. HOW TO REMOVE THE OPERATION BLOCK...

  • Page 86: How To Remove The Operation Board And Lcd

    KX-FT72BR-G 3.3. HOW TO REMOVE THE OPERATION BOARD AND LCD...

  • Page 87: How To Remove The Bottom Frame And Analog Board

    KX-FT72BR-G 3.4. HOW TO REMOVE THE BOTTOM FRAME AND ANALOG BOARD...

  • Page 88: How To Remove The Digital, Power Supply Board And Ac Inlet

    KX-FT72BR-G 3.5. HOW TO REMOVE THE DIGITAL, POWER SUPPLY BOARD AND AC INLET...

  • Page 89: How•@To Remove The Motor Block And Separation Roller

    KX-FT72BR-G 3.6. HOW•@TO REMOVE THE MOTOR BLOCK AND SEPARATION ROLLER...

  • Page 90: How To Remove The Motor And Gears Of Motor Block

    KX-FT72BR-G 3.7. HOW TO REMOVE THE MOTOR AND GEARS OF MOTOR BLOCK...

  • Page 91: How To Remove The Image Sensor (Cis)

    KX-FT72BR-G 3.8. HOW TO REMOVE THE IMAGE SENSOR (CIS)

  • Page 92: How To Remove The Document Feed Roller

    KX-FT72BR-G 3.9. HOW TO REMOVE THE DOCUMENT FEED ROLLER...

  • Page 93: How To Remove The Thermal Head

    KX-FT72BR-G 3.10. HOW TO REMOVE THE THERMAL HEAD...

  • Page 94: Installation Position Of The Lead Wires

    KX-FT72BR-G 3.11. INSTALLATION POSITION OF THE LEAD WIRES...

  • Page 95: How To Replace The Flat Package Ic

    KX-FT72BR-G 4 HOW TO REPLACE THE FLAT PACKAGE IC If you do not have the special tools (for example: SPOT HEATER) to remove the SPOT HEATER´S Flat IC, if you have solder (large amount), a soldering iron, and a cutter knife, you can easily remove the ICs even if there are more than 100 pins.

  • Page 96: Flat Package Ic Installation Procedure

    KX-FT72BR-G 4.3. FLAT PACKAGE IC INSTALLATION PROCEDURE 4.4. BRIDGE MODIFICATION PROCEDURE...

  • Page 97: Circuit Operations

    KX-FT72BR-G 5 CIRCUIT OPERATIONS 5.1. CONNECTION DIAGRAM...

  • Page 98: General Block Diagram

    KX-FT72BR-G 5.2. GENERAL BLOCK DIAGRAM The control section will be explained as shown in the block diagram. 1. ASIC (IC1) Composed mainly of an address decoder, modem control section, CPU and RTC. Controls the general FAX operations. Controls the operation panel I/F.
  • Page 99 KX-FT72BR-G 5.2.1. General Block Diagram...

  • Page 100: Control Section

    KX-FT72BR-G 5.3. CONTROL SECTION 5.3.1. BLOCK DIAGRAM...
  • Page 101 KX-FT72BR-G 5.3.2. ASIC (IC1) This custom IC is used for general FAX operations. 1. CPU This model uses a Z80 equivalent CPU operating at 8MHz. Many of the peripheral functions are handled by custom designed LSIS. As a result, the CPU only needs to process the result.
  • Page 102 KX-FT72BR-G Pin Name Buffer Power supply 5V Tolerant Signal Name Description IRDATXD/IOP81 3.3V OPEN O Not used IRDARXD/IOP80 3.3V OPEN O Not used TXD/IOP30 3.3V BREAK O TEL Line Break Control RXD/IOP31 3.3V H/S ALC Not used (Hardware Control) XRTS/IOP32 3.3V...
  • Page 103 KX-FT72BR-G Pin Name Buffer Power supply 5V Tolerant Signal Name Description TEST3 3.3V +3.3V Test pin. fixed High XOUT 3.3V XOUT 24MHz oscillator 3.3V 24MHz oscillator Ground 3.3V +3.3V Power supply TEST4 3.3V +3.3V Test pin. fixed High XHSTWR/IOP41 3.3V...
  • Page 104 KX-FT72BR-G Pin Name Buffer Power supply 5V Tolerant Signal Name Description STB2 MULT3/5 STB2 O Thermal head strobe 2 STB3 MULT3/5 OPEN O Not used STB4 MULT3/5 OPEN O Not used THDAT MULT3/5 TH DATA O Thermal data Ground MULT3/5...
  • Page 105 KX-FT72BR-G 5.3.3. ROM (IC2) This 128 KB ROM (OTPROM or MASKROM) has 32 KB of common area and bank area (BK4~BK15). The capacity of each bank is 8 KB. The addresses of the common area are from 0000H to 7FFFH, and addresses 8000H to 9FFFH are for the bank area.
  • Page 106 KX-FT72BR-G 5.3.6. SRAM and RTC BACK UP CIRCUIT 1. Function This unit has a lithium battery (BAT1) which works for the RAM (IC3) and Real Time Clock (RTC, Integrated into ASIC:IC1). The user parameter for auto dial numbers, the transmission ID, the system setup date and so on are stored in the RAM (IC3).
  • Page 107 KX-FT72BR-G 5.3.7. SUPERVISION CIRCUIT FOR THE THERMAL HEAD TEMPERATURE 1. Function The thermistor changes the resistor according to the temperature and uses the thermistor´s characteristics. The output of pin 193 of IC1 becomes a low level. Then when it becomes a high level, it triggers point (A).

  • Page 108: Facsimile Section

    KX-FT72BR-G 5.3.8. LED ARRAY(CIS) The LED ARRAY will light during transmission and copying as a light source to recognize document characters, patterns, or graphics on a document. It is also possible to light the LED ARRAY in the test mode.
  • Page 109 KX-FT72BR-G 5.4.2. BLOCK DIAGRAM...
  • Page 110 KX-FT72BR-G 5.4.3. THERMAL HEAD 1. Function This unit utilizes state of the art thermal printer technology. The recording paper (roll paper) is chemically processed. When the thermal head contacts this paper it emits heat momentarily, and black dots (appearing like points) are printed on the paper. If this continues, letters and/or diagrams appear, and the original document is reproduced.
  • Page 111 KX-FT72BR-G...
  • Page 112 KX-FT72BR-G 5.4.4. SCANNING BLOCK The scanning block of this device consists of a control circuit and a contact image sensor made up of a celfoc lens array, an LED array, and photoelectric conversion elements. When an original is inserted and the start button pressed, pin 154 of IC1 goes to a high level and the transistor inside IC7 turns on.
  • Page 113 KX-FT72BR-G 5.4.5. STEPPING MOTOR DRIVE CIRCUIT 1. Function One individual stepping motor is used for transmission and reception. It feeds the document or recording paper synchronized for reading or printing. 2. Circuit Operation During motor drive, gate array IC1 pin 153 becomes a high level, and Q14 and Q7 go ON as a result. +24 V is supplied to the motor coil.
  • Page 114 KX-FT72BR-G 5.4.6. GEAR SECTION This section shows how the motor-driven gear mechanism works in the main operations: FAX transmission, FAX reception the motor and copying. 5.4.6.1. MODE SELECTION When the motor attached to the Drive Motor Gear rotates counterclockwise (CCW), Swing Gear A-2 engages the CAM and the CAM turns counterclockwise to select a mode.
  • Page 115 KX-FT72BR-G 5.4.6.2. MODE OPERATION Once a mode is selected, the Drive Motor Gear rotates clockwise (CW) and then the Swing Gear A-1 controls the mode operation. A: Transmit mode Swing Gear A-1 engages G6 and conveys its drive power to the Separation Roller Gear for pre-feeding documents.
  • Page 116 KX-FT72BR-G 5.4.6.3.2. SCANNING CROSS REFERENCE: SENSOR SECTION (P.72) 5.4.6.3.3. PRINTING Note: See 6.5. SENSERS AND SWITCHES.
  • Page 117 KX-FT72BR-G 5.4.6.3.4. COPYING CROSS REFERENCE: SENSOR SECTION (P.72)

  • Page 118: Sensors And Switches

    KX-FT72BR-G 5.5. SENSORS AND SWITCHES All of the sensor and switches are shown below. Sensor Circuit Sensor Sensor or Switch Name Message Error Location Digital Motor Position ———— Analog Cover Open and Paper set [CHECK COVER] and [OUT OF PAPER] Hook SW ————...
  • Page 119 KX-FT72BR-G 5.5.1. MOTOR POSITION SENSOR This sensor is a detection switch for recording the position of the CAM. Digital Board Signal (IC1-174 Pin) Home position Low level Other High level 5.5.2. COVER OPEN AND PAPER SET SWITCH (SW1) When there is no recording paper, the plate is separated from the switch lever and the switch turns off.
  • Page 120 KX-FT72BR-G 5.5.3. READ POSITION (PS2) When a document is brought to the read position, the shelter plate passes the sensor light, the photo transistor becomes ON, and the input signal of the CN2-5 pin (Operation) becomes a low level. When there is no document at the read position, the shelter plate closes the sensor light, the photo transistor becomes OFF, and the input signal of the CN2-5 pin (Operation) becomes a high level.

  • Page 121: Modem Section

    KX-FT72BR-G 5.6. MODEM SECTION 5.6.1. FUNCTION The unit uses a 1 chip modem (IC1), enabling it to act as an interface between the control section for FAX sending and receiving, and the telephone line. During a sending operation, the digital image signals are modulated and sent to the telephone line.
  • Page 122 KX-FT72BR-G 3. Facsimile Call Time Series As shown in the following diagram, the facsimile call time series is divided into five phases. Phase A : Call setting Call setting can be manual/automatic. Phase B : Pre-message procedure Phase B is a pre-processing procedure and sequence for confirming the status of the terminal, transmission route, etc. and for terminal control.
  • Page 123 KX-FT72BR-G 6. Explanation of Technology a. G3 Communication Signals (T. 30 Binary Process) For G3 facsimile communication, this is the procedure for exchanging control signals between the sending and receiving machines both before and after transmission of image signals. Control signals at 300 bps FSK are: 1850 Hz...0, 1650Hz...1.
  • Page 124 KX-FT72BR-G (Example) Bit No. DIS/DTC Transmitter - T.2 operation Receiver - T.2 operation Receiver - T.2 operation T.2 IOC = 176 T.2 IOC = 176 Transmitter - T.3 operation Receiver - T.3 operation Receiver - T.3 operation Reserved for future T.3 operation features.
  • Page 125 KX-FT72BR-G Bit No. DIS/DTC Standard setting Recording width capability 1216 picture elements along Middle 1216 elements of 1728 picture elements scan line length of 151 ± mm 1% Recording width capability 864 picture elements along Middle 864 elements of 1728 picture elements scan line length of 107 ±...
  • Page 126 KX-FT72BR-G b. Redundancy Compression Process Coding Mode This unit uses one-dimensional MH format.
  • Page 127 KX-FT72BR-G 5.6.2. MODEM CIRCUIT OPERATION The ASIC (IC1) has all the hardware satisfying the ITU-T standards mentioned previously. The modem is included in IC1. The signal communicates with the TEL line through the analog front end IC (IC5) of digital/analog, analog/digital convertor.

  • Page 128: Analog Unit Block Diagram

    KX-FT72BR-G 5.7. ANALOG UNIT BLOCK DIAGRAM...

  • Page 129: Ncu Section

    KX-FT72BR-G 5.8. NCU SECTION 5.8.1. GENERAL This section is the interface between the telephone line and external telephone. It is composed of an EXT. TEL Line relay (RLY1), bell detection circuit, EXT TEL selection circuit, pulse dialing circuit, line amplifier, sidetone circuits and multiplexer.
  • Page 130 KX-FT72BR-G 5.8.5. LINE AMPLIFIER AND SIDE TONE CIRCUITS 1. Circuit Operation The reception signal received as output from line transformer T2 is given as input to C23, R33 and IC2 pin (6). Then it is input to the reception system at an amplifier gain of 5.9 dB from pin (6).

  • Page 131: Its (Integrated Telephone System) And Monitor Section

    KX-FT72BR-G 5.9. ITS (Integrated telephone System) and MONITOR SECTION 5.9.1. GENERAL During the monitor operation, the speaker output passes through the power amplifier (IC1) [Analog board]. The DTMF signal is output from the modem (IC1: digital board). The alarm tone, the key tone, bell tone, and beep are output from gate array IC1 (digital board).
  • Page 132 KX-FT72BR-G 5.10.1. CIRCUIT DIAGRAM...

  • Page 133: Operation Board Section

    READ POSITION SENSOR DOCUMENT SENSOR DIGITAL BOARD OPERATION BOARD KX-FT72BR-G OPERATION BOARD:BLOCK DIAGRAM 5.11.1. KEY SCAN When CN1(8) (OPSEL) is "H", the analog switch (IC1) is available. The "KLATCH", "KSCLK" and "KTXD" control the analog switch (IC1) to read at KIN0~3.
  • Page 134 KX-FT72BR-G 5.11.2. SENSOR DETECTION When CN1(8) (OPSEL) is "L", the detection of the document sensor and read start position sensor are available. 5.11.3. LCD CONTROL "KTXD", "KSCLK", "KLATCH" and "KSTART" are sent as D0~D3 to control the LCD.

  • Page 135: Power Supply Board Section

    KX-FT72BR-G 5.12. POWER SUPPLY BOARD SECTION...
  • Page 136 KX-FT72BR-G Using a different winding ratio results in the voltage function given by the formula in figure (c). As you can see, it is possible to keep VO constant by changing the ratio of TON and TOFF in response to variations in input voltage.

  • Page 137: Terminal Guide Of The Ics Transistors And Diodes

    KX-FT72BR-G 6 TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES...

  • Page 138: Fixtures And Tools

    KX-FT72BR-G 7 FIXTURES AND TOOLS...

  • Page 139: Cabinet, Mechanical And Electrical Parts Location

    KX-FT72BR-G 8 CABINET, MECHANICAL AND ELECTRICAL PARTS LOCATION 8.1. OPERATION PANEL SECTION...

  • Page 140: Upper Cabinet Section

    KX-FT72BR-G 8.2. UPPER CABINET SECTION...

  • Page 141: Lower Cabinet/P.c.b. Section

    KX-FT72BR-G 8.3. LOWER CABINET/P.C.B. SECTION CROSS REFFERENCE: MOTOR SECTION (P.142)

  • Page 142: Motor Section

    KX-FT72BR-G 8.4. MOTOR SECTION...

  • Page 143: Actual Size Of Screws

    KX-FT72BR-G 8.5. ACTUAL SIZE OF SCREWS...

  • Page 144: Accessories And Packing Materials

    KX-FT72BR-G 9 ACCESSORIES AND PACKING MATERIALS...

  • Page 145: Replacement Parts List

    KX-FT72BR-G 10 REPLACEMENT PARTS LIST Notes: Ref. Part No. Part Name & Description Remarks 1. The marking (RTL) indicates that the Retention Time is PFDF1017Z SHAFT limited for this item. PFDJ1020Z SPACER, PLATEN (LEFT) PFDN1033Z ROLLER, PLATEN After the discontinuation of this assembly in production, the...

  • Page 146: Digital Board Parts

    KX-FT72BR-G Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks PFUS1214Z TORSION SPRING, ROLLER EARTH 2SD1819A TRANSISTOR(SI) PFHX1555Z PLASTIC PARTS, DIGITAL UNIT PQVTDTC114EU TRANSISTOR(SI) WLR18YK26CM4 EARTH LEAD 2SB1322 TRANSISTOR(SI) PQMX10010Z SUMI TUBE PQVTDTC114EU...
  • Page 147 KX-FT72BR-G Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks ERJ3GEY0R00 ERJ3GEYJ224 220K ERJ3GEY0R00 ERJ3GEYJ224 220K ERJ3GEY0R00 ERJ3GEYJ222 2.2K ERJ3GEY0R00 ERJ3GEYJ473 ERJ3GEYJ473 ERJ3GEYJ102 ERJ3GEY0R00 ERJ3GEY0R00 ERJ3GEY0R00 R102 ERJ3GEYJ821 ERJ3GEYJ103 R103 ERJ3GEYJ821 ERJ3GEYJ472 4.7K...

  • Page 148: Analog Board Parts

    KX-FT72BR-G Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks ECUV1H182KBV 0.0018 G4A1A0000160 TRANSFORMER ECUV1C104KBV ECUV1C104KBV (COILS) ECUV1H181JCV 180P PQLQR2KA213 COIL ECUV1C104KBV PQLQR2KA213 COIL ECUV1C104KBV PQLQR2KA213 COIL ECUV1H101JCV 100P PQLQR2KA213 COIL ECUV1C104KBV PQLQR1RS102...

  • Page 149: Operation Board Parts

    KX-FT72BR-G Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks ECUV1H101JCV 100P SW31 EVQ11Y05B SWITCH ECUV1E104ZFV ECEA1HKS4R7 (RESISTORS) ECUV1C683KBV 0.068 ERJ3GEYJ103 ECUV1H822KBV 0.0082 ERJ3GEYJ103 ECUV1H102KBV 0.001 ERJ3GEYJ103 ECEA1HKS4R7 ERJ3GEYJ103 ECUV1H103KBV 0.01 ERJ3GEYJ103 ECEA1CKS100...

  • Page 150: Fixtures And Tools

    KX-FT72BR-G Ref. Part No. Part Name & Description Remarks Ref. No. Part No. Part Name & Description PQZZ2K1Z EXTENSION CABLE, 2 PIN R105 PQ4R10XJ100 EC10 PFZZ2K2Z EXTENSION CABLE, 2 PIN R106 ERG2SJ101 R107 ERG2SJ101 KM79811245C0 BASIC FACSIMILE TECHNIQUE R108 ERDS2TJ104...

  • Page 151: Printed Circuit Board

    11 PRINTED CIRCUIT BOARD 11.1. DIGITAL BOARD : COMPONENT VIEW R90 Q10 C103 C106 3.3V PFUP1267ZA 24VA C101 3.3V/B 5V/B R133 R103 R102 R132 RESET1 DIGITAL BOARD (COMPONENT) KX-FT72BR-G...

  • Page 152: Digital Board (Pcb1) : Bottom View

    11.2. DIGITAL BOARD (PCB1) : BOTTOM VIEW 0.25A C107 C102 C60 R51 R101 TEST C27 C56 3.3V TP10 R134 R104 R136 RESET C105 TP13 0.25A TP14 TP11 PFUP1267ZA DIGITAL BOARD (BOTTOM) KX-FT72BR-G...

  • Page 153: Analog Board (Pcb2) : Component View

    11.3. ANALOG BOARD (PCB2) : COMPONENT VIEW PFUP1268ZA a b c d A B C 1 2 3 4 5 6 7 8 9 A B C A B C D E F G ANALOG BOARD (COMPONENT) KX-FT72BR-G...

  • Page 154: Analog Board (Pcb2) : Bottom View

    11.4. ANALOG BOARD (PCB2) : BOTTOM VIEW PFUP1268ZA JJ21 JJ57 AUTO-CH PCB-CH JJ51 JJ52 JJ15 JJ12 JJ16 JJ11 JJ17 JJ13 JJ18 JJ59 JJ54 JJ19 JJ53 JJ14 JJ20 JJ55 JJ56 ANALOG BOARD (BOTTOM) KX-FT72BR-G...

  • Page 155: Operation Board (Pcb3)

    STOP JJ26 SW26 SW10 SW18 SW15 COPY JJ27 JJ28 VOL + SW27 SW11 SW19 SW29 SW22 SW14 SW30 SW31 JJ23 MENU PREV NEXT HELP MONITOR/ SW26 SW12 SW20 SW13 SP-PHONE SW21 FAX/START/ VOL - FLASH REDIAL MUTE OPERATION BOARD KX-FT72BR-G...

  • Page 156: Power Supply Board (Pcb4)

    (BOTTOM VIEW) CN31 R112 R105 R104 CN301 T101 R221 R225 PC101 R222 R223 (COMPONENT VIEW) VR201 SRF912UC PRIMARY C205 D105 R109 D106 PC101 SECONDARY Q201 C109 R110 R108 R106 D205 D107 R101 ZNR101 T101 C102 R206 POWER SUPPLY BOARD KX-FT72BR-G...

  • Page 157: For The Schematic Diagrams

    KX-FT72BR-G 12 FOR THE SCHEMATIC DIAGRAMS Note: 1. DC voltage measurements are taken with an oscilloscope or a tester with a ground. 2. The schematic diagrams and circuit board may be modified at any time with the development of new technology.

  • Page 158: Schematic Diagram

    KX-FT72BR-G 13 SCHEMATIC DIAGRAM 13.1. DIGITAL BOARD (PC1) +24VF TO MOTOR 3.3V (10) MOTOR ON: 3.3V (11) (12) (13) OFF: 0V (14) (15) (16) PRINTING (17) (18) 23~24V +24V (19) (20) (21) (22) (23) (24) (25) (26) PRINTING 3.3V 4.7K...
  • Page 159 KX-FT72BR-G +3.3V A[0-17] +3.3V/BATT +24V D[0-7] +24VF A[17] A[0] A[0] D[0] D[0] A[16] 1 +24v A[1] D[1] A[1] D[1] A[15] A[2] D[2] A[2] D[2] A[14] 2 +24v A[3] D[3] A[3] D[3] A[13] A[4] D[4] A[4] D[4] A[12] 3 +24v A[5]...

  • Page 160: Analog Circuit (Pcb2)

    J270p +5VD NO PAPER: 5V 390K PAPER: 0V K0.033 K0.033 +5VA +2.0V +5VA +5VD 1 HSMIC(-) 2KA113T 2KA113T 3 HSSP(+) 2KA113T +2.0V +5VD 2 HSSP(-) 2KA113T 4 HSMIC(+) HOOK SW 16V10 ON-HOOK: 5V OFF-HOOK: 0V ANALOG BOARD SCHEMATIC DIAGRAM KX-FT72BR-G...

  • Page 161: Operation Board (Pcb3)

    RECEIVE MODE COPY STOP FAX/START 3 V0 4 RS TO:DIGITAL BOARD 5 R/W KSTART 7 DB0 KIN3 8 DB1 KIN2 9 DB2 KIN1 10 DB3 KIN0 OPESEL MICIN KRXD PAPER PAPER KTXD SENSOR1 SENSOR2 KLATCH KSCLK OPERATION BOARD SCHEMATIC DIAGRAM KX-FT72BR-G...

  • Page 162: Power Supply Board (Pcb4)

    C102 C110 R108 C103 C104 100K 2200p 2200p R109 D105 D202 IC202 5.1K L101 D106 R110 R113 R112 R111 PC101 330K 330K 330K ZNR101 25.5V 470V C101 Cycle=2.2 s 0.22 -35V Cycle=2.2 s CN31 POWER SUPPLY BOARD SCHEMATIC DIAGRAM KX-FT72BR-G...
  • Page 163 KX-FT72BR-G KXFT72BRG...

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