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Panasonic KX-FT25LA Service Manual

Facsimile with telephone answering system
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Facsimile with Telephone Answering system
KX-FT25LA
(Latin America)
ORDER NO. KMF0002393C3
© 2000 Kyushu Matsushita Electric Co., Ltd. All
rights
reserved.
Unauthorized
distribution is a violation of law.
copying
and

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Summary of Contents for Panasonic KX-FT25LA

  • Page 1 ORDER NO. KMF0002393C3 Facsimile with Telephone Answering system KX-FT25LA (Latin America) © 2000 Kyushu Matsushita Electric Co., Ltd. All rights reserved. Unauthorized copying distribution is a violation of law.

  • Page 2: Table Of Contents

    KX-FT25LA CONTENTS Page Page 1 INTRODUCTION 6.10. ATAS (Automatic Telephone Answering System) 1.1. SAFETY PRECAUTIONS SECTION 1.2. INSULATION RESISTANCE TEST 6.11. OPERATION PANEL 1.3. FOR SERVICE TECHNICIANS 6.12. POWER SUPPLY BOARD SECTION 1.4. BATTERY CAUTION 7 FOR THE SCHEMATIC DIAGRAMS 1.5.

  • Page 3: Introduction

    KX-FT25LA 1 INTRODUCTION 1.1. 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 4: Ac Caution

    KX-FT25LA 1.5. AC CAUTION For safety, before closing the lower cabinet, please make sure of the following precautions.

  • Page 5: Personal Safety Precautions

    KX-FT25LA 1.6. PERSONAL SAFETY PRECAUTIONS 1.6.1. MOVING SECTIONS OF THE UNIT Be careful not to let your hair, clothes, fingers, accessories, etc., become caught in any moving sections of the unit. The moving sections of the unit are the rollers and a gear. There is a separation roller and a document feed roller which are rotated by the document feed motor.

  • Page 6: Features

    KX-FT25LA 1.7. FEATURES General · Desktop type · LCD (Liquid Crystal Display) readout · Help function · Copier function · Digital answering system Facsimile · Space Saving Compact Design · Resolution: standard/fine/super fine/halftone · Copier Function · Automatic Document Feeder (10 Sheets) ·...

  • Page 7: Specifications

    KX-FT25LA 1.8. 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: Ccitt No. 1 Test Chart

    KX-FT25LA 1.10. CCITT No. 1 TEST CHART...

  • Page 9: Location Of Controls

    KX-FT25LA 1.11. LOCATION OF CONTROLS 1.11.1. OVERVIEW...
  • Page 10 KX-FT25LA 1.11.2. CONTROL PANEL...

  • Page 11: Connections

    KX-FT25LA 1.12. CONNECTIONS NOTE When you operate this products, the power outlet should be near the product and easily accessible.

  • Page 12: Installation

    KX-FT25LA 1.13. INSTALLATION 1.13.1. INSTALLING THE RECORDING PAPER Note: Only use the included roll of paper or specified recording paper, or else the print quality may be affected and/or excessive thermal head wear may occur. For accessory order information. When the power cord is connected, every time you close the cover a message will be printed. If the recording paper is set to the wrong side, the message will not be printed.
  • Page 13 KX-FT25LA 1.13.3. SETTING YOUR LOGO...

  • Page 14: Documents You Can Send

    KX-FT25LA 1.13.4. To select characters with the dial keypad Pressing the dial keys will select a character as shown below. 1.13.5. Documents you can send Note: Remove clips, staples or other similar fastening objects. Check that ink, paste or correction fluid has dried.

  • Page 15: Maintenance Items And Component Locations

    KX-FT25LA 1.14. MAINTENANCE ITEMS AND COMPONENT LOCATIONS 1.14.1. 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 16 KX-FT25LA 1.14.2.1. MAINTENANCE LIST 1.14.2.2. MAINTENANCE CYCLE...
  • Page 17 KX-FT25LA 1.14.3. MAINTENANCE 1.14.3.1. CLEANING THE DOCUMENT FEEDER UNIT If misfeeding occurs frequently or if dirty patterns or black bands appear on a copied or transmitted document, clean the document feeder.
  • Page 18 KX-FT25LA 1.14.3.2. CLEANING THE THERMAL HEAD If dirty patterns or black bands appear on a copied or received document, clean the thermal head. Disconnect the power cord and the telephone line cord. Thermal head Open the cover by pressing the cover open button.

  • Page 19: Troubleshooting Guide

    KX-FT25LA 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 20: User Recoverable Errors

    KX-FT25LA 2.2. USER RECOVERABLE ERRORS If the unit detects a problem, the following messages will appear on the display.
  • Page 21 KX-FT25LA 2.2.1. Document Jam...

  • Page 22: Troubleshooting Details

    KX-FT25LA 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 23 KX-FT25LA 2.3.3. Simple Check List...
  • Page 24 KX-FT25LA 2.3.4. TROUBLESHOOTING ITEMS TABLE...
  • Page 25 KX-FT25LA 2.3.4.1. ADF (Auto Document Feed) Section 1. No document feed...
  • Page 26 KX-FT25LA 2. Document JAM...
  • Page 27 KX-FT25LA 3. Multiple feed When using thick paper etc., If the document will not feed. Refer to 3.1. ADJUSTING THE FEED PRESSURE.
  • Page 28 KX-FT25LA 4. Skew...
  • Page 29 KX-FT25LA 5. Image is distorted (When printing)
  • Page 30 KX-FT25LA 6. Black or white vertical lines appear 7. Skewed receiving image...
  • Page 31 KX-FT25LA 8. Expander print (When printing) 9. When copying or printing, an abnormal sound is heard from the unit...
  • Page 32 KX-FT25LA...
  • Page 33 KX-FT25LA 2.3.4.2. Communication Section Find the problem in the table shown below, and refer to the corresponding troubleshooting procedure in 2.3.4.2.1. Defective facsimile section.
  • Page 34 KX-FT25LA 2.3.4.2.1. Defective facsimile section 1. Transmit problem...
  • Page 35 KX-FT25LA 2. Sometimes there is a transmit problem...
  • Page 36 KX-FT25LA 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. OUT OF PAPER CHECK COVER Unit OVERHEATED (If it doesn´t return automatically, COVER OPEN, etc., reset the unit.) CHECK DOCUMENT Please refer to 2.2.
  • Page 37 KX-FT25LA 4. The unit can copy, but cannot transmit/receive...
  • Page 38 KX-FT25LA 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 39 KX-FT25LA (Causes and Countermeasures) (Cause A) When a training signal is transmitted from FAX1 during the communication procedure at the time of transmission from FAX1 toFAX2, there is a delay until the echo canceler operates. S1 is closed so that a part of the head of the training signal may dropout.
  • Page 40 KX-FT25LA 6. The unit can copy, but the transmission and reception image is incorrect (Long distance or international communication operation) This depends widely on the transmission and reception capability of the other FAX unit and the line conditions. The countermeasures for this unit are shown below.
  • Page 41 KX-FT25LA 7. How to output the Journal Report:...
  • Page 42 KX-FT25LA SND=TRANSMISSION RCV=RECEPTION Most fax communication problems can be resolved by the following steps. a. Change the transmit level. (Service code: 596, refer to 2.4.4. Service Function Table.) b. Change the TX speed/RX speed. (Service code: 717/718, refer to 2.4.4. Service Function Table.)
  • Page 43 KX-FT25LA Countermeasure...
  • Page 44 KX-FT25LA...
  • Page 45 KX-FT25LA...
  • Page 46 KX-FT25LA...
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  • Page 51: Remote Programming

    KX-FT25LA 2.3.4.2.2. 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 52 KX-FT25LA 1. Entering the remote programming mode and changing service codes...
  • Page 53 KX-FT25LA 2. Program Mode Table Code Function Set Value Default Remote setting Set the date and time dd/mm/yy hh:mm AM/PM --------- Your logo --------- --------- Your telephone number --------- --------- Print transmission report 1:ERROR 2:ON 3:OFF ERROR Auto receive mode...
  • Page 54 KX-FT25LA Code Function Set Value Default Remote setting Receiving Sensitivity 20~48 Transmit speed select 1:9600/2:7200/3:4800/4:2400bps 9600bps Receive speed select 1:9600/2:7200/3:4800/4:2400bps 9600bps Ringer off in TEL/FAX mode 1:ON/2:OFF Pause tone detect 1:ON/2:OFF Redial tone detect 1:ON/2:OFF CPC mode 1:A / 2:B / 3:OFF...

  • Page 55: Digital Board Section

    KX-FT25LA 2.3.4.3. 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.) Then first thing to do is check the power source, If there is no problem with the power supply unit, then there is a problem with the digital unit (main board).
  • Page 56 KX-FT25LA 2.3.4.3.1. Digital Block Diagram...
  • Page 57 KX-FT25LA 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-FT25LA Normal Wave Patterns...
  • Page 59 KX-FT25LA 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 60 KX-FT25LA...
  • Page 61 KX-FT25LA After the power is turned on, the ASIC (CPU) initializes and checks each IC. The ROM, SRAM, and Modem are checked. If initialization fails for the ICs, the system will not boot up.
  • Page 62 KX-FT25LA...
  • Page 63 KX-FT25LA NG Example...
  • Page 64 KX-FT25LA 2.3.4.3.2. 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-FT25LA 2.3.4.4. 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-FT25LA Note: { }: Inside the digital board [ ]: Inside the operation board...
  • Page 67 KX-FT25LA 2.3.4.4.2. Defective ITS (Integrated Telephone System) Section...
  • Page 68 KX-FT25LA 2.3.4.4.3. Digital Speakerphone The digital speakerphone has different features from the analog speakerphone. The analog speakerphone switches between Tx or Rx. Either Tx or Rx is able to pass through a telephone line or speaker, depending on the Tx and Rx signal (voice) level. The higher-level signal (either TX or RX) can pass through the route.
  • Page 69 KX-FT25LA Refer to 2.3.4.4. Analog Board Section.
  • Page 70 KX-FT25LA 2.3.4.5. Power Supply Board Section 1. Key components for troubleshooting The following components have been known to break frequently: F101, D101-D104, C109, Q101, PC101, ZD203, R302. 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 71 KX-FT25LA 2. Troubleshooting Flow Chart...
  • Page 72 KX-FT25LA...
  • Page 73 KX-FT25LA 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 74 KX-FT25LA 2.3.4.6. Operation Board Section 1. No key operation 2. No LCD indication...
  • Page 75 KX-FT25LA 2.3.4.7. Sensor Section Refer to 6.5. SENSORS AND SWITCHES for the circuit descriptions. 1. Check the document sensor (PS1)...."CHECK DOCUMENT" 2. Check the read position (PS2)...."REMOVE DOCUMENT"...
  • Page 76 KX-FT25LA 2.3.4.8. Read Section Refer to 6.4.4. SCANNING BLOCK.
  • Page 77 KX-FT25LA...
  • Page 78 KX-FT25LA 2.3.4.9. Thermal Head Section Refer to 6.4.3. THERMAL HEAD.

  • Page 79: Programming And Lists

    KX-FT25LA 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 80 KX-FT25LA 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 81 KX-FT25LA 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 05000 msec Selects the pause time in 100 msec steps. Setting the flash recall time 01~99 X 10 msec...
  • Page 82 KX-FT25LA Code Function Set Value Effective Range Default Remarks Setting the overseas DIS 1: Detects on the 1st 1, 2 Detects on the Sets the recognition format of the DIS signal. detection time.2: Detects on the 1st time. 1:Detects the first DIS signal sent from the 2nd time.
  • Page 83 KX-FT25LA 2.4.5. SERVICE MODE SETTINGS (Example of a printed out list) Note: The above values are the default values.
  • Page 84 KX-FT25LA 2.4.6. OTHER 2.4.7. SPECIAL SERVICE JOURNAL REPORTS Journal 3 shown below, which are special journals giving the additional detailed information about the latest 35 communications, can be printed by Service Code 882. Remote printing function for the journal reports (JOURNAL and JOURNAL 3) is also available for service technicians.
  • Page 85 KX-FT25LA 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 86: Test Functions

    KX-FT25LA 2.5. TEST FUNCTIONS...
  • Page 87 KX-FT25LA 2.5.1. DTMF SIGNAL TONE TRANSMIT SELECTION Note: After performing this check, do not forget to turn the setting off. Otherwise, dialing using DTMF will not be possible. 2.5.2. BUTTON CODE TABLE Note: These codes (00, 01) are only for the data in the History Report.

  • Page 88: Adjustments

    KX-FT25LA 3 ADJUSTMENTS 3.1. ADJUSTING THE FEED PRESSURE If no feeding or multiple feeding occurs frequently, adjust the feeder pressure. 1. Open the front lid by pressing the front lid open. 2. Shift the position of the lever using an instrument with a pointed end, such as paper clip.

  • Page 89: Disassembly Instructions

    KX-FT25LA 4 DISASSEMBLY INSTRUCTIONS...
  • Page 90 KX-FT25LA...
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  • Page 100: How To Replace The Flat Package Ic

    KX-FT25LA 5 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 101: Flat Package Ic Installation Procedure

    KX-FT25LA 5.3. FLAT PACKAGE IC INSTALLATION PROCEDURE 5.4. BRIDGE MODIFICATION PROCEDURE...

  • Page 102: Circuit Operations

    KX-FT25LA 6 CIRCUIT OPERATIONS 6.1. CONNECTION DIAGRAM...

  • Page 103: General Block Diagram

    KX-FT25LA 6.2. 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 104 KX-FT25LA 6.2.1. General Block Diagram...

  • Page 105: Control Section

    KX-FT25LA 6.3. CONTROL SECTION 6.3.1. BLOCK DIAGRAM...
  • Page 106 KX-FT25LA 6.3.2. 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 107 KX-FT25LA Pin No. Pin Name Buffer Power Supply Description Digital TONE1 3.3V TONE1 (Analog output) TONE1 TONE2 3.3V TONE2 (Analog output) TONE2 VOLU1 (3.3V) Electronic volume REF for speaker EVOL REF VOLU2 (3.3V) Electronic volume OUT for speaker EVOL OUT VOLU3 (3.3V)
  • Page 108 KX-FT25LA Pin No. Pin Name Buffer Power Supply Description Digital Ground Power supply for buffer RBA0 Bank address (also used as DRAM address) RBA1 Bank address (also used as DRAM address) RBA2 Bank address (also used as DRAM address) RBA3...

  • Page 109: Reset Circuit

    KX-FT25LA 6.3.3. ROM (IC2) This 512 KB ROM (OTPROM or MASKROM) has 32 KB of common area and bank area (BK4~BK 63). 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 110 KX-FT25LA 6.3.6. SRAM and RTC BACK UP CIRCUIT 1. Function This unit has a lithium battery (BAT1) which works for the RAM (IC4) 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 (IC4).
  • Page 111 KX-FT25LA 6.3.7. 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 137 of IC1 becomes a low level. Then when it becomes a high level, it triggers point (A).
  • Page 112 KX-FT25LA 6.3.8. 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 113: Facsimile Section

    KX-FT25LA 6.4. FACSIMILE SECTION 6.4.1. IMAGE DATA FLOW DURING FACSIMILE OPERATION COPY (Fine, Super-Fine, Half Tone) 1. Line information is read by CIS, via route (1), and is input to IC1. 2. In IC1, the data is adjusted to a suitable level for A/D conversion in the Analog Signal Processing Section, and via route (2) it is input to A/D conversion (8 bit).
  • Page 114 KX-FT25LA 6.4.2. Block Diagram...

  • Page 115: Thermal Head

    KX-FT25LA 6.4.3. 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 116 KX-FT25LA...
  • Page 117 KX-FT25LA 6.4.4. 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 128 of IC1 goes to a high level and the transistor inside IC8 turns on.
  • Page 118 KX-FT25LA 6.4.5. 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 124 becomes a high level, and Q7 and Q5 go ON as a result. +24 V is supplied to the motor coil.

  • Page 119: Gear Section

    KX-FT25LA 6.4.6. GEAR SECTION This section shows how the motor-driven gear mechanism works in the main operations: FAX transmission, FAX reception the motor and copying. 6.4.6.1. 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 120 KX-FT25LA 6.4.6.2. 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 121 KX-FT25LA 6.4.6.3.2. Scanning 6.4.6.3.3. Printing Note: See 6.5. SENSERS AND SWITCHES.
  • Page 122 KX-FT25LA 6.4.6.3.4. Copying...

  • Page 123: Sensors And Switches

    KX-FT25LA 6.5. 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 CALL SERVICE 2 Analog Cover Open and Paper set [CHECK COVER] and [OUT OF PAPER] Hook SW ————...
  • Page 124 KX-FT25LA 6.5.1. Motor Position Sensor This sensor is a detection switch for recording the position of the CAM. Digital Board Signal (IC1-119 Pin) Home position Low level Other High level 6.5.2. Recording Paper Sensor (SW1) When there is no recording paper, the plate is separated from the switch lever and the switch turns off.
  • Page 125 KX-FT25LA 6.5.3. Read Position Sensor (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 126: Modem Section

    KX-FT25LA 6.6. MODEM SECTION 6.6.1. FUNCTION The unit uses a 1 chip modem (IC5), 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. During a receiving operation, the analog image signals which are received via the telephone line are demodulated and converted into digital image signals.
  • Page 127 KX-FT25LA Phase D is the procedure for confirming that the message is completed and received. For continuous transmission, phase B or phase C are repeated for transmission. Phase E : Call retrieval Phase E is the procedure for call retrieval, that is for circuit disconnection.
  • Page 128 KX-FT25LA Explanation of Signals Control signals are comprised mainly of 8-bit identification signals and of the data signals added to them. Data signals are added to DIS and DCS signals. Signal..DIS (Digital Identification Signal) Identification Signal Format..00000001 Function: Notifies the capacity of the receiving unit. The added data signals are as follows.
  • Page 129 KX-FT25LA Bit No. DIS/DTC 17, 18 Recording width capabilities Recording width (0, 0) 1728 picture elements along scan line length of 1728 picture elements along scan line length of 215 mm ± 1% 215 mm ± 1% (0, 1) 1728 picture elements along scan line length of 2432 picture elements along scan line length of 215 mm ±...
  • Page 130 KX-FT25LA Note 2 - Standard facsimile units conforming to T.3 must have the following capability: Index of cooperation (IOC)=264. Note 3 - Standard facsimile units conforming to T.4 must have the following capability: Paper length=297 mm. Signal Identification Signal Format...
  • Page 131 KX-FT25LA b. Redundancy Compression Process Coding Mode This unit uses one-dimensional MH format.
  • Page 132 KX-FT25LA 6.6.2. MODEM CIRCUIT OPERATION The modem (IC5) has all the hardware satisfying the ITU-T standards mentioned previously. When the ASIC IC1 (61) is brought to a low level, the modem (IC5) is chip-selected and the resistors inside IC are selected by the select signals from ASIC (IC1) ADR0-ADR4.

  • Page 133: Analog Unit Block Diagram

    KX-FT25LA 6.7. Analog Unit Block Diagram...

  • Page 134: Ncu Section

    KX-FT25LA 6.8. NCU SECTION 6.8.1. GENERAL This section is the interface between the telephone line. It is composed of bell detection circuit, pulse dialing circuit, CPC detection circuit, line amplifier, sidetone circuits and Remote FAX activation circuit. 6.8.2. Line Relay (RLY1) 1.
  • Page 135 KX-FT25LA 6.8.5. LINE AMPLIFIER AND SIDE TONE CIRCUITS 1. Circuit Operation The reception signal received as output from line transformer T1 is given as input to C14, R13 and IC2(2). Then it is input to the reception system at an amplifier gain of 3.3 dB from pin (2).

  • Page 136: Its (Integrated Telephone System) And Monitor Section

    KX-FT25LA 6.9. ITS (Integrated telephone System) and MONITOR SECTION 6.9.1. GENERAL The general ITS operation is performed by the special IC5 which has a handset circuit. The alarm tone, the key tone, and the beep are output from the ASIC IC1 (digital board). During the pulse dial operation, the monitor tone is output from the ASIC IC1.
  • Page 137 KX-FT25LA 6.10.2. Circuit Diagram...

  • Page 138: Operation Panel

    KX-FT25LA 6.11. OPERATION PANEL The unit consists of an LCD (Liquid crystal display), KEYs, photo interrupters (sensor), and analog switches (for key scan). The key scan (analog switch control, reading), sensor detection (sensor control, reading) and LCD control are all controlled by I/O of ASIC (IC1) on the digital board.
  • Page 139 KX-FT25LA 6.11.2. SENSOR DETECTION When CN1(8) (OPSEL) is "L", the detection of the document sensor and read start position sensor are available. 6.11.3. LCD CONTROL "KTXD", "KSCLK", "KLATCH" and "KSTART" are sent as D4~D7 to control the LCD.

  • Page 140: Power Supply Board Section

    KX-FT25LA 6.12. POWER SUPPLY BOARD SECTION...
  • Page 141 KX-FT25LA 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 142: For The Schematic Diagrams

    KX-FT25LA 7 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 143: Printed Circuit Board

    KX-FT25LA 8 PRINTED CIRCUIT BOARD 8.1. PRINTED CIRCUIT BOARD (DIGITAL BOARD): COMPONENT VIEW PFUP1184Z L13 R57 C115 C119 C117 C118 IC11 C102 C101 TEST 3.3V...

  • Page 144: Printed Circuit Board (Digital Board): Bottom

    KX-FT25LA 8.2. PRINTED CIRCUIT BOARD (DIGITAL BOARD): BOTTOM VIEW C116 C120 C112 MDM3.3V C104 C105 RESET1 R102 XCLK C107 EYECLK EYEXY EYESYNC C103 RESET R100 R101 XTEST 3.3V ANONI BATT 3.3V/BATT 5V/BATT PFUP1184Z F1 FTG DG...

  • Page 145: Printed Circuit Board (Analog Board): Component View

    KX-FT25LA 8.3. PRINTED CIRCUIT BOARD (ANALOG BOARD): COMPONENT VIEW PFUP1185Z...

  • Page 146: Printed Circuit Board (Analog Board): Bottom View

    KX-FT25LA 8.4. PRINTED CIRCUIT BOARD (ANALOG BOARD): BOTTOM VIEW PFUP1185Z...

  • Page 147: Supply)

    KX-FT25LA 8.5. PRINTED CIRCUIT BOARD (SWITCHING POWER SUPPLY) (COMPONENT VIEW) (BOTTOM VIEW) CAUTION SRF912UC FOR CONTINUED PROTECTION AGAINST RISK OF MITSUMI ELEC. CO., LTD. FIRE. REPLACE ONLY WITH 68-4492A SAME TYPE AC125V 5A CN31 7694V-0 AC125V 5A 94V-0 RATINGS OF FUSE.

  • Page 148: Printed Circuit Board (Operation Board)

    KX-FT25LA 8.6. PRINTED CIRCUIT BOARD (OPERATION BOARD) (COMPONENT VIEW) (BOTTOM VIEW)

  • Page 149: Schematic Diagram

    KX-FT25LA 9 SCHEMATIC DIAGRAM 9.1. SCHEMATIC DIAGRAM (DIGITAL CIRCUIT) +5VD +24V FAX TX A[0] D[0] +3.3V/BATT +3.3V +5VD Z0.1 +24V CIS LED ARRAY A[1] D[1] 1 +24v A[2] D[2] A[0] D[0] +5V/BATT FAX RX ON: 3.3V A[3] D[3] A[1] D[1]...

  • Page 150: Schematic Diagram (Analog Circuit)

    KX-FT25LA 9.2. SCHEMATIC DIAGRAM (ANALOG CIRCUIT) FAX TX FAX RX J220p +5VA FAX RX 56Kµ K0.1 150(2W) K0.1 Z0.1 +2.0V K0.01 RLY1 POS1 220(1/4W) +5VD +5VD 250V1 50V4.7 BELL DETECT FAX TX 47K(1/2W) +12V +24V LINE ON/OFF, DIALPULSE +24V +5VD +5VA 3.3V...

  • Page 151: Schematic Diagram (Switching Power Supply)

    KX-FT25LA 9.3. SCHEMATIC DIAGRAM (SWITCHING POWER SUPPLY) 300V -0.8V Cycle=2.2 s T101 TRANS CN301 Cycle=2.2 s D201 D102 D101 C202 D103 D104 1000p R105 G R223 C205 Q101 1/50 D107 Q102 R107 R106 C109 ZNR102 470V 100/2 100/2 0.01 C102...

  • Page 152: Schematic Diagram (Operation Circuit)

    KX-FT25LA 9.4. SCHEMATIC DIAGRAM (OPERATION CIRCUIT) 680p 560k KEY SCAN 0V K 0.1 SENSOR SCAN 5V OV/3.3V/5V NO PAPER 0V Document Read PAPER 5V sensor position sensor...

  • Page 153: Terminal Guide Of The Ic·s Transistors And Diodes

    KX-FT25LA 10 TERMINAL GUIDE OF THE IC´S TRANSISTORS AND DIODES...

  • Page 154: Fixtures And Tools

    KX-FT25LA 11 FIXTURES AND TOOLS...

  • Page 155: Cabinet, Mechanical And Electrical Parts

    KX-FT25LA 12 CABINET, MECHANICAL AND ELECTRICAL PARTS LOCATION 12.1. OPERATION PANEL SECTION...

  • Page 156: Upper Cabinet Section

    KX-FT25LA 12.2. UPPER CABINET SECTION...

  • Page 157: Lower Cabinet/P.c.b. Section

    KX-FT25LA 12.3. LOWER CABINET/P.C.B. SECTION...

  • Page 158: Motor Section

    KX-FT25LA 12.4. MOTOR SECTION Note: Make sure that Gears 1, 2 and 3 are installed face up. (The product number is put on the face.)

  • Page 159: Actual Size Of Screws And Washer

    KX-FT25LA 12.5. ACTUAL SIZE OF SCREWS AND WASHER...

  • Page 160: Accessories And Packing Materials

    KX-FT25LA 13 ACCESSORIES AND PACKING MATERIALS...

  • Page 161: Replacement Parts List

    KX-FT25LA 14 REPLACEMENT PARTS LIST This replacement parts list is for KX-FT25LA only. Ref. Part No. Part Name & Description Remarks Refer to the simplified manual (cover) for other areas. PFJE1009Z LEAD, OPERATION Notes: PFDE1096Z LEVER, DOCUMENT DETECTION PFDE1100Z LEVER, READ DETECTION 1.

  • Page 162: Digital Board Parts

    KX-FT25LA Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks PFJP03S04Z AC INLET PQLB1E1 FERRITE CORE (TRANSISTORS) PQJS02Q59Y CONNECTOR, 2PIN XWC4B WASHER 2SC4155S TRANSISTOR(SI) PFUS1177Z SPRING, EARTH 2SC4155S TRANSISTOR(SI) PFJS08R44Z CONNECTOR, 8PIN 2SB1322...
  • Page 163 KX-FT25LA Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks ERJ3GEY0R00 ERJ8GEY0R00 ERJ3GEYJ151 ERJ3GEYJ821 ERJ3GEY0R00 ERJ3GEYJ6R8 ERJ8GEY0R00 ERJ3GEY0R00 ERJ8GEY0R00 ERJ3GEYJ101 ERJ3GEY0R00 ERJ3GEYJ101 ERJ3GEY0R00 ERJ3GEY0R00 ERJ3GEYJ101 ERJ8GEY0R00 ERJ3GEYJ823 ERJ8GEY0R00 ERJ3GEYJ470 PQ4R18XJ100 ERDS1TJ222 2.2k ERJ3GEYJ223 PQ4R18XJ220 2.2k...

  • Page 164: Analog Board Parts

    KX-FT25LA Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks ECUV1H104ZFV ECUV1H104ZFV ECEA1HKS100 ECUV1C104KBV ECUV1H104ZFV ECUV1H104ZFV ECUV1H104ZFV ECUV1H102KBV 0.001 ECUV1H120JCV ECEA1CK101 ECUV1H104ZFV ECUV1C104KBV ECUV1H150JCV ECUV1C104KBV ECUV1H104ZFV ECUV1H101JCV 100P ECUV1H104ZFV ECUV1H681KBV 680P ECUV1H104ZFV C100...

  • Page 165: Operation Board Parts

    KX-FT25LA Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks ERG2SJ122 1.2k PQLQR1RM601 COIL PQLQR1RM601 COIL PQLQR1E32A07 COIL PQLQR1E32A07 COIL (CAPACITORS) ECUV1H103KBV 0.01 (PHOTO ELECTRIC TRANSDUCERS) ECUV1H103KBV 0.01 ECUV1H182KBV 0.0018 PQVIPC814K PHOTO ELECTRIC TRANSDUCER...

  • Page 166: Power Supply Board Parts

    KX-FT25LA Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks CNA1006N PHOTO ELECTRIC TRANSDUCER (CAPACITORS) ECUV1H104ZFV (SWITCHES) ECEA0JK221 ECUV1H681KBV 680P EVQ11Y05B SWITCH, ECUV1C104KBV EVQ11Y05B SWITCH, FLASH ECUV1H103KBV 0.01 EVQ11Y05B SWITCH,"0" DIAL KEY ECUV1C224ZFV 0.22...

  • Page 167: Fixtures And Tools

    KX-FT25LA Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks EC10 PFZZ2K2Z CONNECTOR, 2P (TRANSFORMER) T101 ETS29AK415AC TRANSFORMER KM79811245C0 BASIC FACSIMILE TECHNIQUE (VARIABLE RESISTOR) (for training service technicians) VR201 EVNDJAA03B53 VARIABLE RESISTOR Notes: Tools and Extension Cords are useful for servicing.

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