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Panasonic KX-TG5431BXS Service Manual
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Panasonic KX-TG5431BXS Service Manual

Panasonic KX-TG5431BXS Service Manual

5.8 ghz digital cordless answering system
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Telephone Equipment
KX-TG5431BXS
KX-TGA542BXS
5.8 GHz Digital Cordless Answering
System
Silver Version
(for Asia, Middle Near East and Other areas)
© 2005 Panasonic Communications Co., Ltd. All
rights
reserved.
distribution is a violation of law.
ORDER NO. KM40505726CE
Unauthorized
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  • Page 1 ORDER NO. KM40505726CE Telephone Equipment KX-TG5431BXS KX-TGA542BXS 5.8 GHz Digital Cordless Answering System Silver Version (for Asia, Middle Near East and Other areas) © 2005 Panasonic Communications Co., Ltd. All rights reserved. Unauthorized copying distribution is a violation of law.

  • Page 2: Table Of Contents

    KX-TG5431BXS / KX-TGA542BXS Note: Because CONTENTS 4 to 10 are the extracts from the Operating Instructions of this model, they are subject to change without notice. Please refer to the original Operating Instructions for further information. CONTENTS Page Page 1 ABOUT LEAD FREE SOLDER (PbF: Pb free) 9.2.
  • Page 3 KX-TG5431BXS / KX-TGA542BXS 14.5. Base Unit Reference Drawing 26.1. IC201 14.6. Handset Reference Drawing 27 EXPLANATION OF IC TERMINALS (RF PART) 14.7. Frequency Table 27.1. IC701 14.8. How to Clear User Setting 27.2. IC801 15 DESCRIPTION 27.3. IC851 15.1. Frequency 28 HOW TO REPLACE THE FLAT PACKAGE IC 15.2.

  • Page 4: About Lead Free Solder (Pbf: Pb Free)

    KX-TG5431BXS / KX-TGA542BXS 1 ABOUT LEAD FREE SOLDER (PbF: Pb free) Note: In the information below, Pb, the symbol for lead in the periodic table of elements, will refer to standard solder or solder that contains lead. We will use PbF solder when discussing the lead free solder used in our manufacturing process which is made from Tin (Sn), Silver (Ag), and Copper (Cu).

  • Page 5: How To Recognize That Pb Free Solder Is Used

    KX-TG5431BXS / KX-TGA542BXS 1.2. How to Recognize that Pb Free Solder is Used (Example: Handset P.C.B.) Marked IC241 IC801 IC701 IC201 IC851 (Component View) Note: The location of the “PbF” mark is subject to change without notice.

  • Page 6: For Service Technicians

    KX-TG5431BXS / KX-TGA542BXS 2 FOR SERVICE TECHNICIANS ICs and LSIs are vulnerable to static electricity. When repairing, the following precautions will help prevent recurring malfunctions. 1. Cover plastic parts boxes with aluminum foil. 2. Ground the soldering irons. 3. Use a conductive mat on worktable.

  • Page 7: Battery

    KX-TG5431BXS / KX-TGA542BXS 4 BATTERY 4.1. Battery Installation 4.2. Battery Charge 4.3. Recharging the Battery Note for service: The battery strength may not be indicated correctly if the battery is disconnected and connected again, even after it is fully charged. In that case, by recharging the battery as mentioned above, you will get a correct indication of the battery strength.

  • Page 8: Battery Strength

    KX-TG5431BXS / KX-TGA542BXS 4.4. Battery Strength 4.5. Battery Replacement 4.6. Battery Performance...

  • Page 9: Location Of Controls

    KX-TG5431BXS / KX-TGA542BXS 5 LOCATION OF CONTROLS 5.1. Base Unit 5.2. Handset...
  • Page 10 KX-TG5431BXS / KX-TGA542BXS 5.2.1. How to Use the Soft Keys/Navigator Key...

  • Page 11: Displays

    KX-TG5431BXS / KX-TGA542BXS 6 DISPLAYS 6.1. Display Items...

  • Page 12: Troubleshooting (Handset Lcd)

    KX-TG5431BXS / KX-TGA542BXS 6.2. Troubleshooting (Handset LCD) Cross Reference: (*1) Re-registering the Handset (P.44) (*2) Erasing Items in the Phonebook (P.22)

  • Page 13: Settings

    KX-TG5431BXS / KX-TGA542BXS 7 SETTINGS 7.1. Connections...

  • Page 14: Connecting An Optional Headset

    KX-TG5431BXS / KX-TGA542BXS 7.2. Connecting an Optional Headset 7.3. Guide to Handset Programming...

  • Page 15: Date And Time

    KX-TG5431BXS / KX-TGA542BXS 7.4. Date and Time...

  • Page 16: Dialing Mode

    KX-TG5431BXS / KX-TGA542BXS 7.5. Dialing Mode 7.6. Line Mode 7.7. Flash Button...

  • Page 17: Voice Enhancer

    KX-TG5431BXS / KX-TGA542BXS 7.8. Voice Enhancer 7.9. Handset Ringer Tone...

  • Page 18: Dial Lock

    KX-TG5431BXS / KX-TGA542BXS 7.10. Dial Lock For Service Hint: *: If the current password is forgotten, enter “726276642” and you will be able to go to step 4.

  • Page 19: Direct Commands

    KX-TG5431BXS / KX-TGA542BXS 7.11. Direct Commands Cross Reference: Date and Time (P.15) Dial Lock (P.18)
  • Page 20 KX-TG5431BXS / KX-TGA542BXS Cross Reference: Remote Code (P.29) Re-registering the Handset (P.44)

  • Page 21: Operation

    KX-TG5431BXS / KX-TGA542BXS 8 OPERATION 8.1. Phonebook 8.1.1. Adding Items to the Phonebook...
  • Page 22 KX-TG5431BXS / KX-TGA542BXS 8.1.2. Calling Someone in the Phonebook Note: *: Refer to Adding Items to the Phonebook (P.21) 8.1.3. Editing Items in the Phonebook Note: *: Refer to Adding Items to the Phonebook (P.21) 8.1.4. Erasing Items in the Phonebook...

  • Page 23: Caller Id Service

    KX-TG5431BXS / KX-TGA542BXS 8.1.5. Chain Dial 8.2. Caller ID Service 8.2.1. For Call Waiting Service Users 8.2.2. Caller List...

  • Page 24: Pause Button (For Pbx/Long Distance Service Users)

    KX-TG5431BXS / KX-TGA542BXS 8.2.2.1. Storing Caller Information into the Phonebook 8.2.2.2. Erasing Caller Information 8.3. PAUSE Button (For PBX/Long Distance Service Users)

  • Page 25: Answering System

    KX-TG5431BXS / KX-TGA542BXS 9 ANSWERING SYSTEM The unit contains an answering system which can answer and record calls for you when you are unavailable to answer the phone. Important: • • • • Only 1 person can access the answering system (listen to messages, record a greeting message, etc.) at a time.

  • Page 26: Turning The Answering System On/Off

    KX-TG5431BXS / KX-TGA542BXS 9.2. Turning the Answering System On/Off 9.3. Caller’s Recording Time 9.4. Message Alert...

  • Page 27: Listening To Messages

    KX-TG5431BXS / KX-TGA542BXS 9.5. Listening to Messages 9.5.1. Listening to Messages Using the Base Unit...

  • Page 28: Remote Operation

    KX-TG5431BXS / KX-TGA542BXS 9.5.2. Listening to Messages Using the Handset 9.5.3. Answering System Commands 9.6. Remote Operation...
  • Page 29 KX-TG5431BXS / KX-TGA542BXS 9.6.1. Using the Answering System Remotely 9.6.2. Remote Code...
  • Page 30 KX-TG5431BXS / KX-TGA542BXS 9.6.3. Remote Commands 9.6.4. Turning on the Answering System Remotely...

  • Page 31: Troubleshooting

    KX-TG5431BXS / KX-TGA542BXS 10 TROUBLESHOOTING If the handset display shows error messages, see “Troubleshooting (Handset LCD) (P.12)” for the Cause & Solution. 10.1. General Use Cross Reference: (*1) Battery Installation (P.7) (*2) Connections (P.13) (*3) Battery Charge (P.7) (*4) Re-registering the Handset (P.44)

  • Page 32: Making/Answering Calls, Intercom

    KX-TG5431BXS / KX-TGA542BXS 10.3. Making/Answering Calls, Intercom Cross Reference: (*5) Dialing Mode (P.16) (*6) Dial Lock (P.18) (*7) Connecting an Optional Headset (P.14) 10.4. Phonebook Cross Reference: (*8) Dial Lock (P.18)

  • Page 33: Caller Id

    KX-TG5431BXS / KX-TGA542BXS 10.5. Caller ID Cross Reference: (*9) Caller ID Service (P.23) (*10) Date and Time (P.15)

  • Page 34: Answering System

    KX-TG5431BXS / KX-TGA542BXS 10.6. Answering System Cross Reference: (*11) Remote Code (P.29) (*12) Turning the Answering System On/Off (P.26) (*13) Caller’s Recording Time (P.26) (*14) Listening to Messages Using the Base Unit (P.27) (*15) Message Alert (P.26) (*16) Date and Time (P.15)

  • Page 35: Battery Charge

    KX-TG5431BXS / KX-TGA542BXS 10.7. Battery Charge Cross Reference: (*17) Battery Charge (P.7) (*18) Battery Replacement (P.8) 10.8. Power Failure Cross Reference: (*19) Connections (P.13)

  • Page 36: Disassembly Instructions

    KX-TG5431BXS / KX-TGA542BXS 11 DISASSEMBLY INSTRUCTIONS 11.1. Base Unit Shown in Fig.- To Remove - Remove - Cabinet Cover Screws (2.6 × 12)..(A) × 4 Main P. C. Board Tapes, Solders and Cable Main P. C. Board Operational P. C. Board Tape Screws (2.6 ×...

  • Page 37: Handset

    KX-TG5431BXS / KX-TGA542BXS 11.2. Handset Shown in Fig.- To Remove - Remove - Cabinet Cover Screws (2 × 14)..(C) × 2 Follow the procedure. Main P. C. Board Tape and Solders Screws (2 × 9).....(D ) × 3 Main P. C. Board...

  • Page 38: Assembly Instructions

    KX-TG5431BXS / KX-TGA542BXS 12 ASSEMBLY INSTRUCTIONS 12.1. Fix the LCD and the Receiver Guide to the Main P.C. Board (Handset)

  • Page 39: Troubleshooting Guide

    KX-TG5431BXS / KX-TGA542BXS 13 TROUBLESHOOTING GUIDE Cross Reference: Note: Check Power (P.40) (*1) When a user claims that the unit disconnects a call right after the greeting message and no incoming Error Message Table (P.40) messages can be recorded, this symptom can not be Check Playback (P.42)

  • Page 40: Check Power

    KX-TG5431BXS / KX-TGA542BXS 13.1. Check Power Cross Reference: Note: Power Supply Circuit (P.71) Flash Memory is IC601. Reset Circuit (P.73) DSP is IC501. 13.2. Error Message Table Display Symptom Remedy The initialization was tried, but it could not be done.

  • Page 41: Check Record

    KX-TG5431BXS / KX-TGA542BXS 13.3. Check Record c) How to change the Auto Disconnect activation (time) Some Telephone Company lines (fiber or cable) ON Hook and OFF Hook voltages are lower than conventional lines, which may cause a malfunction of Auto Disconnect detection. To solve this problem, try changing the Auto Disconnect activation through the procedures below.

  • Page 42: Check Playback

    KX-TG5431BXS / KX-TGA542BXS 13.4. Check Playback Cross Reference: Note: Power Supply Circuit (P.71) Flash Memory is IC601. DSP is IC501. 13.5. Check Battery Charge Note: Flash Memory is IC601. DSP is IC501.

  • Page 43: Check Link

    KX-TG5431BXS / KX-TGA542BXS 13.6. Check Link Note: Flash Memory is IC601. DSP is IC501. (*1) Refer to Finding out the Defective part (P.44). Cross Reference: Check the RF part (P.44)

  • Page 44: Check The Rf Part

    KX-TG5431BXS / KX-TGA542BXS 13.7. Check the RF part 13.7.1. Finding out the Defective part After All the Checkings or Repairing 1. Re-register the checked Handset to the checked Base Unit, and Regular HS to Regular BU. Note: (*1) HS: Handset (*2) BU: Base Unit 13.7.1.1.
  • Page 45 KX-TG5431BXS / KX-TGA542BXS 13.7.2. RF Check Flowchart Each item (1 ~ 6) of RF Check Flowchart corresponds to Check Table for RF part (P.46). Please refer to the each item.
  • Page 46 KX-TG5431BXS / KX-TGA542BXS 13.7.3. Check Table for RF part Item BU (Base Unit) Check HS (HandSet) Check Link Confirmation Normal 1. Register Regular HS to BU (to be checked). 1. Register HS (to be checked) to Regular BU. 2. Press [Talk] key of the Regular HS to 2.
  • Page 47 KX-TG5431BXS / KX-TGA542BXS 13.7.4. TEST RANGE Check Circuit block which range is defective can be found by the following check. Item BU (Base Unit) Check HS (HandSet) Check Range Confirmation TX 1. Register Regular HS to BU (to be checked).
  • Page 48 KX-TG5431BXS / KX-TGA542BXS 13.7.5. RF-DSP Interface Signal Wave Form <Test Burst Mode>...
  • Page 49 KX-TG5431BXS / KX-TGA542BXS <Test Burst Mode>...

  • Page 50: Check Handset Transmission

    KX-TG5431BXS / KX-TGA542BXS 13.8. Check Handset Transmission Cross Reference: SIGNAL ROUTE (P.91). 13.9. Check Handset Reception Cross Reference: SIGNAL ROUTE (P.91). Note: When checking the RF part, Refer to Check the RF part (P.44) 13.10. Check Caller ID Cross Reference: Telephone Line Interface (P.74).

  • Page 51: Adjustment And Test Mode

    KX-TG5431BXS / KX-TGA542BXS 14 ADJUSTMENT AND TEST MODE 14.1. Test Mode Flow Chart for Base Unit 14.1.1. Test Burst Mode Note: (*1) LCD displays the Channel number. (*2) Refer to Check Table for RF part (P.46) and RX-CW Test Mode (P.56) for proper Handset settings.
  • Page 52 KX-TG5431BXS / KX-TGA542BXS 14.1.2. RX-CW Test Mode Note: (*1) LCD displays the Channel number. (*2) Refer to Check Table for RF part (P.46) and Test Burst Mode (P.55) for proper Handset settings.
  • Page 53 KX-TG5431BXS / KX-TGA542BXS 14.1.3. Test Link Mode Note: (*1) LCD displays the Channel number. (*2) LCD displays the number of selected power. (*3) Refer to Check Table for RF part (P.46) and Test Link Mode (P.57) for proper Handset settings.
  • Page 54 KX-TG5431BXS / KX-TGA542BXS 14.1.4. Adjustment Mode Cross Reference Check and Adjust X501 (Base Unit) Frequency (P.59) Note: (*1) This is an adjustment value (hex.).

  • Page 55: Test Mode Flow Chart For Handset

    KX-TG5431BXS / KX-TGA542BXS 14.2. Test Mode Flow Chart for Handset 14.2.1. Test Burst Mode Note: (*1) LCD displays the Channel number. (exception: default/ CH00 = 1ch.) (*2) Refer to Check Table for RF part (P.46) and RX-CW Test Mode (P.52) for proper Base Unit settings.
  • Page 56 KX-TG5431BXS / KX-TGA542BXS 14.2.2. RX-CW Test Mode Note: (*1) LCD displays the Channel number. (exception: default/ CH00 = 1ch.) (*2) Refer to Check Table for RF part (P.46) and Test Burst Mode (P.51) for proper Base Unit settings.
  • Page 57 KX-TG5431BXS / KX-TGA542BXS 14.2.3. Test Link Mode Note: (*1) LCD displays the Channel number. (exception: default/ CH00 = 1ch.) (*2) for factory use only. (*3) Refer to Check Table for RF part (P.46) and Test Link Mode (P.53) for proper Base Unit settings.
  • Page 58 KX-TG5431BXS / KX-TGA542BXS 14.2.4. Adjustment Mode Cross Reference (*1) Adjust Battery Low Detector Voltage (Handset) (P.59) Note: (*2) These are the default values. (*3) These values may not be fixed depending on the battery strength.

  • Page 59: X501 (Base Unit), X201 (Handset) Check

    KX-TG5431BXS / KX-TGA542BXS 14.3. X501 (Base Unit), X201 (Handset) Check Equipment: Frequency counter Check Point for measurement: BCK Checking tolerance: 13.824MHz ± 270Hz (Base Unit)/13.824MHz ± 100Hz (Handset) 14.3.1. Check and Adjust X501 (Base Unit) Frequency 1. Set up Base Unit in TEST mode.

  • Page 60: Base Unit Reference Drawing

    14.5. Base Unit Reference Drawing When connecting the Simulator Equipment for checking, please refer to below. Frequency Counter (*1) Oscilloscope DC_VOLT_METER BMC-CLK RSSI (RS) (BCK) ANT0 CN101 SA101 SHIELD D301 C301 C302 SA102 IC841 IC761 IC851 D371 C382 C305 D362 Q361 L371 SA104...

  • Page 61: Handset Reference Drawing

    14.6. Handset Reference Drawing When connecting the Simulator Equipment for checking, please refer to below. MONITOR_SP AC VOLT DC_VOLT_METER Oscilloscope METER VBAT1 VSS1 Oscilloscope VBAT2 DC_POWER_SUPPLY INT_1 3.5~4.2V (pin100) 3.9V 3.5V (Battery) VSS2 SP_PHONE VBAT R242 R354 RA251 C264 PQUP11290Z C242 L326 D354...

  • Page 62: Frequency Table

    KX-TG5431BXS / KX-TGA542BXS 14.7. Frequency Table 14.7.1. Base Unit Channel TX/RX Frequency (MHz) Channel TX/RX Frequency (MHz) Channel TX/RX Frequency (MHz) 5759.702398 5788.242242 5816.782086 5760.592291 5789.132135 5817.671978 5761.486139 5790.025982 5818.565826 5762.376031 5790.915875 5819.455719 5763.269879 5791.809723 5820.349566 5764.159771 5792.699615 5821.239459 5765.053619 5793.593463...
  • Page 63 KX-TG5431BXS / KX-TGA542BXS 14.7.2. Handset Channel TX/RX Frequency (MHz) Channel TX/RX Frequency (MHz) Channel TX/RX Frequency (MHz) 5759.700425 5788.240269 5816.780113 5760.594273 5789.134117 5817.673960 5761.484165 5790.024009 5818.563853 5762.378013 5790.917857 5819.457701 5763.267906 5791.807749 5820.347593 5764.161753 5792.701597 5821.241441 5765.051646 5793.591490 5822.131333 5765.945494 5794.485337 5823.025181...

  • Page 64: How To Clear User Setting

    KX-TG5431BXS / KX-TGA542BXS 14.8. How to Clear User Setting Units are reset to the Factory settings by this operation (Erase recorded Voice messages, stored Phone numbers, Caller list and etc.). This operation should not be performed for a usual repair.

  • Page 65: Description

    KX-TG5431BXS / KX-TGA542BXS 15 DESCRIPTION 15.1. Frequency The frequency range of 5.76GHz-5.84GHz is used. Transmitting and receiving channel between Base Unit and Handset is same frequency. Refer to Frequency Table (P.62). 15.2. FHSS (Frequency Hopping Spread Spectrum) This telephone is using an IC chip which has similar specification to WDCT (World Digital Cordless Telephone) and is the telephone system that can use multiple portable unit simultaneously.
  • Page 66 KX-TG5431BXS / KX-TGA542BXS 15.2.1. TDD Frame Format Sync Field (72bit): Preamble 56bit + SyncWord 16bit Base Unit (Handset) adjusts the timing of reception so that reception of Base Unit (Handset) can correspond to transmission of Handset (Base Unit). It is necessary for sync-field that Handset gets synchronization.

  • Page 67: Signal Flowchart In The Whole System

    KX-TG5431BXS / KX-TGA542BXS 15.3. Signal Flowchart in the Whole System Reception CN101 of the Base Unit is connected to the TEL line, and signal is enter through the bridge diode D101. While talking, the relay (Q141) is turned ON and amplified at the Q171, then led to DSP (IC501). The DSP encodes ADPCM and TDD/TDMA with FHSS to TXMOD.

  • Page 68: Explanation Of Link Data Communication

    KX-TG5431BXS / KX-TGA542BXS 16 EXPLANATION OF LINK DATA COMMUNICATION 16.1. Calling 16.2. To Terminate Communication 16.3. Ringing...
  • Page 69 17 BLOCK DIAGRAM (BASE UNIT_MAIN) Q141 CN101 KEYS D101 Q161 R131,R132 Ti p SIDE TONE INUSE CIRCUIT DETECT Ring TEL JACK ANT0 ANT1 X501 Q521 13.824MHz Q171 CN301 RECEIVE Q111 OSC_IN DC JACK LOUT BELL DETECT RXDATA RF_PART TXDATA DCIN RADIO_EN BELL LO_EN...

  • Page 70: Circuit Operation (Base Unit_Main)

    KX-TG5431BXS / KX-TGA542BXS 18 CIRCUIT OPERATION (BASE UNIT_MAIN) General Description: (DSP, Flash Memory) is a digital speech/signal processing system that implements all the functions of speech compression, record and playback, and memory management required in a digital telephone answering machine.

  • Page 71: Power Supply Circuit

    KX-TG5431BXS / KX-TGA542BXS 18.3. Power Supply Circuit Function: The power supply voltage from AC adaptor is converted to the desired voltage of each block. Circuit Operation: • • • • Q300 and IC300: 4.0V DCDC Converter • • • • IC331: 3.3V Regulator...
  • Page 72 KX-TG5431BXS / KX-TGA542BXS 18.3.1. Charge Circuit The voltage from the AC is supplied to the charge circuits. Main charge (180mA at the Battery) of maximum 6-hours is started soon after the Handset is placed on the Base Unit. Then it changes to Trickle charge to prevent from overcharging.

  • Page 73: Reset Circuit

    KX-TG5431BXS / KX-TGA542BXS 18.4. Reset Circuit Function: This circuit is used to initialize the microcomputer when it incorporates an AC adaptor. Circuit Operation: When the AC Adaptor is inserted into the unit, then the voltage is shifted by IC331 and power is supplied to the DSP.

  • Page 74: Locator/Intercom Mode

    KX-TG5431BXS / KX-TGA542BXS 18.5. Locator/Intercom Mode 1. Press the Base Unit LOCATOR/INTERCOM button, then a call monitor signal (intercom sound) is output from pins 29 and 31 of IC501. Thus a monitor tone is heard from the speaker. 2. At the same time, the Handset ring. This status is called “Intercom stand-by”.

  • Page 75: Auto Disconnect Circuit

    KX-TG5431BXS / KX-TGA542BXS 18.7. Auto Disconnect Circuit Function: This circuit is used to detect the fact that another telephone connected to the same line is OFF-HOOK while the unit is in a receiving status or OGM transmitting status. Circuit Operation: The voltage of pin 35 of IC501 is monitored.

  • Page 76: Parallel Connection Detect Circuit

    KX-TG5431BXS / KX-TGA542BXS 18.8. Parallel Connection Detect Circuit Function: In order to disable call waiting and stutter tone functions when using telephones connected in parallel, it is necessary to have a circuit that judges whether a telephone connected in parallel is in use or not. This circuit determines whether the telephone connected in parallel is on hook or off hook by detecting changes in the T/R voltage.

  • Page 77: Calling Line Identification (Caller Id)

    KX-TG5431BXS / KX-TGA542BXS 18.9. Calling Line Identification (Caller ID) Function: The caller ID is a chargeable ID which the user of a telephone circuit obtains by entering a contract with the telephone company to utilize a caller ID service. For this reason, the operation of this circuit assumes that a caller ID service contract has been entered for the circuit being used.

  • Page 78: Block Diagram (Base Unit_Rf Part)

    19 BLOCK DIAGRAM (BASE UNIT_RF PART) Power Supply Circuit V_PA 5.8GHz Power Amp. and Antenna Switch Circuit V_RF IC841 3.0V REGULATOR ANT_0 IC851 FL811 IC761 2.5V REGULATOR RADIO_EN PA_CONT ANT_1 SYN_LE2 SYN_DATA SYN_CLK SYN_LE1 SYN_OUT OSC_IN TX_EN Serial Interface Serial Interface 2.4GHz TX_DATA...

  • Page 79: Block Diagram (Handset_Rf Part)

    20 BLOCK DIAGRAM (HANDSET_RF PART) Power Supply Circuit V_PA 5.8GHz Power Amp. and Antenna Switch Circuit V_RF IC841 3.0V REGULATOR IC851 FL811 IC761 2.5V REGULATOR RADIO_EN PA_CONT SYN_LE2 SYN_DATA SYN_CLK SYN_LE1 SYN_OUT OSC_IN TX_EN Serial Interface Serial Interface 2.4GHz TX_DATA Frac-N IC801 3.4GHz...

  • Page 80: Circuit Operation (Rf Part)

    KX-TG5431BXS / KX-TGA542BXS 21 CIRCUIT OPERATION (RF PART) General Description: RF part includes Transmitter and Receiver functions. Digital signals (Mainly voice data) that come from DSP, are modulated and are transmitted. On the other hand, received signals are demodulated and go out to DSP.

  • Page 81: Power Supply Circuit

    KX-TG5431BXS / KX-TGA542BXS 21.1. Power Supply Circuit As indicated below, the various voltages are supplied to each block. V_PA, about 4.0V at Base Unit or 3.3V at Handset, is supplied to the Power amplifier in 5.8GHz PA circuit. IC841 is 3.0V Regulators, and IC761 is a 2.5V Regulator. They output Vcc_5.8GHz, and Vcc_2.4GHz respectively by order of...

  • Page 82: Ghz Mod/Demod Circuit

    KX-TG5431BXS / KX-TGA542BXS 21.2. 2.4GHz Mod/Demod Circuit IC701 incorporates all of the modulation and demodulation functions. TX Digital data (TX_DATA) from DSP is supplied to pin 27 of IC701, and then 2.4GHz TX modulated signal is output from pin1. This TX signal goes into the 5.8GHz Converter circuit. 2.4GHz RX signal from 5.8GHz Converter circuit is passed through matching circuit and supplied to pin4 of IC701, then demodulated signal...

  • Page 83: Ghz Converter Circuit

    KX-TG5431BXS / KX-TGA542BXS 21.3. 5.8GHz Converter Circuit This block converts frequency of TX signal and RX signal. IC801 includes TX-MIXER, RX-MIXER, PLL and VCO modules internally. The VCO module is tuned by PLL synthesizer module, and generates 3.4GHz Local signal. Reference clock (13.824MHz) from DSP block is supplied to pin7 of IC701.

  • Page 84: Ghz Lna (Low Noise Amplifier) Circuit

    KX-TG5431BXS / KX-TGA542BXS 21.4. 5.8GHz LNA (Low Noise Amplifier) Circuit This block amplifies receiving 5.8GHz signal. 5.8GHz RX signal from Antenna Switch circuit amplified by LNA (Low Noise Amplifier) Q871 and filtered by HPF (FL821), and then supplied to 5.8GHz Converter circuit.

  • Page 85: Ghz Power Amplifier And Antenna Switch Circuit

    KX-TG5431BXS / KX-TGA542BXS 21.5. 5.8GHz Power Amplifier and Antenna Switch Circuit This block amplifies power of 5.8GHz TX signal. 5.8GHz TX signal from 5.8GHz Converter circuit is filtered by 5.8GHz-BPF FL811, and amplified by Power amplifier (PA) block of IC851, and then passes through internal 5.8GHz-BPF. After that, it is supplied to Antenna Switch block of IC851.

  • Page 86: Block Diagram (Handset)

    KX-TG5431BXS / KX-TGA542BXS 22 BLOCK DIAGRAM (HANDSET) IC241 X201 EEPROM 13.824MHz Q341 Q231 CHG_DET CHARGE OSC-IN DETECT Q362, Q363 RF part TX_DATA RX_DATA CHARGE CHG_CTL PA_CONT CONTROL RADIO_EN CON_EN Q221 SYN_LE2 SYN_OUT RESET RESET SYN_DATA Q361 SYN_CLK CHARGE SYN_LE1 IC221...

  • Page 87: Circuit Operation (Handset)

    KX-TG5431BXS / KX-TGA542BXS 23 CIRCUIT OPERATION (HANDSET) 23.1. Construction The circuit mainly consists of DSP and RF part as shown in the block diagram. 23.1.1. DSP: IC201 Function • • • • Battery Low, Power down detect circuit • • • • Ringer Generation •...

  • Page 88: Power Supply Circuit

    KX-TG5431BXS / KX-TGA542BXS 23.2. Power Supply Circuit Voltage is supplied separately to each block. Block Diagram (Handset Power) KEY, BACK +3.6V BATTERY LIGHT BATT+ +3.6V BATT- LEDS REG +3.0V IC371 Q361 +3.0VA D353 CHARGE2 IC201 +3.0VD CHARGE1 EEPROM IC241 RA371...

  • Page 89: Charge Circuit

    KX-TG5431BXS / KX-TGA542BXS 23.3. Charge Circuit When the Handset is put on the cradle of the Base unit, the power is supplied from CHARGE+ and CHARGE- terminals to charge the battery via D353 and R368 or Q361. The voltage between CHARGE+ and CHARGE- flows R231 → Q231 → pin80 of IC201, where the charge is detected.

  • Page 90: Sending Signal

    KX-TG5431BXS / KX-TGA542BXS 23.5. Sending Signal The voice signal from the microphone is input to DSP (42, 43). CN331 is the headset jack. When the headphone is connected, the Q331 detect it. The input from the microphone of the Handset (MIN, MIP) is cut and the microphone signal from the headset is input to DSP (36).

  • Page 91: Signal Route

    KX-TG5431BXS / KX-TGA542BXS 24 SIGNAL ROUTE Each signal route is as follows.
  • Page 92 KX-TG5431BXS / KX-TGA542BXS Each signal route is as follows. RF part signal route...

  • Page 93: Cpu Data (Base Unit)

    KX-TG5431BXS / KX-TGA542BXS 25 CPU DATA (BASE UNIT) 25.1. IC501 Description High High_Z Description High High_Z LINE_SZ 62 BMCCLK High NOT_RLY On Hook Off Hook 63 RXEN Active BELL 64 TXEN Active Off Hook On Hook 65 RXGAIN High AC_DOWN _DET...

  • Page 94: Cpu Data (Handset)

    KX-TG5431BXS / KX-TGA542BXS 26 CPU DATA (HANDSET) 26.1. IC201 Description High High_Z Description High High_Z NC(INT0) Normal 60 (FLASH_SI) High NC(CV-hook) Normal 61 (FLASH_CS) Normal DOT_LCD_RS Data Instruct 62 BMCCLK DOT_LCD_RW Read Write 63 RXEN Active 64 TXEN Active DOT_LCD_E _RD D.O...

  • Page 95: Explanation Of Ic Terminals (Rf Part)

    KX-TG5431BXS / KX-TGA542BXS 27 EXPLANATION OF IC TERMINALS (RF PART) 27.1. IC701...

  • Page 96: Ic801

    KX-TG5431BXS / KX-TGA542BXS 27.2. IC801 Backside Terminal: GND...

  • Page 97: Ic851

    KX-TG5431BXS / KX-TGA542BXS 27.3. IC851 Backside Terminal: GND...

  • Page 98: How To Replace The Flat Package Ic

    KX-TG5431BXS / KX-TGA542BXS 28 HOW TO REPLACE THE FLAT PACKAGE IC Even if you do not have the special tools (for example, a spot heater) to remove the Flat IC, with some solder (large amount), a soldering iron and a cutter knife, you can easily remove the ICs that have more than 100 pins.

  • Page 99: Flat Package Ic Installation Procedure

    KX-TG5431BXS / KX-TGA542BXS 28.3. FLAT PACKAGE IC INSTALLATION PROCEDURE 1. Temporarily fix the FLAT PACKAGE IC, soldering the two marked pins. *Check the accuracy of the IC setting with the corresponding soldering foil. 2. Apply flux to all pins of the FLAT PACKAGE IC.

  • Page 100: Cabinet And Electrical Parts (Base Unit)

    KX-TG5431BXS / KX-TGA542BXS 29 CABINET AND ELECTRICAL PARTS (BASE UNIT)

  • Page 101: Cabinet And Electrical Parts (Handset)

    KX-TG5431BXS / KX-TGA542BXS 30 CABINET AND ELECTRICAL PARTS (HANDSET)

  • Page 102: Accessories And Packing Materials

    KX-TG5431BXS / KX-TGA542BXS 31 ACCESSORIES AND PACKING MATERIALS 31.1. KX-TG5431BXS...

  • Page 103: Terminal Guide Of The Ics, Transistors And Diodes

    KX-TG5431BXS / KX-TGA542BXS 32 TERMINAL GUIDE OF THE ICs, TRANSISTORS AND DIODES 32.1. Base Unit 32.2. Handset...

  • Page 104: Replacement Parts List

    KX-TG5431BXS / KX-TGA542BXS 33 REPLACEMENT PARTS LIST Note: Ref. Part No. Part Name & Description Remarks 1. RTL (Retention Time Limited) PQHR11082Z GUIDE, SP HOLDER POM-HB The marking (RTL) indicates that the Retention Time is PQWE10037Z BATTERY TERMINAL PS-HB PQBC10423Z1...
  • Page 105 KX-TG5431BXS / KX-TGA542BXS Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks L472 G1C6R8MA0072 COIL R474 ERJ2GEJ1R0 L501 PQLQR2KA213 COIL R506 ERJ2GEJ121 L711 MQLRF18NJFB COIL R521 ERJ2GEJ182 1.8K L782 G1C1R0KA0096 COIL R522 ERJ2GEJ151...

  • Page 106: Handset

    KX-TG5431BXS / KX-TGA542BXS Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C458 ECJ0EB1C223K 0.022 C804 ECJ0EC1H150J C459 F1G1C153A081 0.015 C806 ECJ0EC1H100D C501 ECUV1C104KBV C809 ECJ0EB1H102K 0.001 C503 ECUV1C104KBV C811 ECJ0EC1H020C C504 ECUV1C104KBV...
  • Page 107 KX-TG5431BXS / KX-TGA542BXS Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks PQSX10285Z KEYBOARD SWITCH (COILS) PQWE10033Z BATTERY TERMINAL ABS-HB L331 PQLQR2KB113T COIL PQJT10225Z CHARGE TERMINAL (L) L332 PQLQR2KB113T COIL PQJT10226Z CHARGE TERMINAL (R)

  • Page 108: Accessories And Packing Materials

    KX-TG5431BXS / KX-TGA542BXS Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R834 ERJ2GEJ332 3.3K C749 ECJ0EC1H101J 100P R856 ERJ2GEJ472X 4.7K C750 ECJ0EC1H101J 100P R872 ERJ2GEJ473 C751 ECJ0EC1H100D R873 ERJ2GEJ121 C752 ECJ0EB1H471K 470P...

  • Page 109: For Schematic Diagram

    KX-TG5431BXS / KX-TGA542BXS 34 FOR SCHEMATIC DIAGRAM 34.1. Base Unit (SCHEMATIC DIAGRAM (BASE UNIT_MAIN)) 34.1.1. Acoustic Testing Mode Notes: 1. DC voltage measurements are taken with voltmeter from the negative voltage line. 2. This schematic diagram may be modified at any time with the development of new technology.
  • Page 110 KX-TG5431BXS / KX-TGA542BXS 35 SCHEMATIC DIAGRAM (BASE UNIT_MAIN) CON_EN CON_EN V_RF (VPA) V_RF V_RF RADIO_EN RADIO_EN PA_CONT PA_CONT SYN_LE2 SYN_LE2 SYN_OUT SYN_OUT IC609 SYN_DATA SYN_DATA SYN_CLK SYN_CLK R521 C521 R523 SYN_LE1 SYN_LE1 1.8K TX_DATA TX_DATA Q521 RX_GAIN RX_GAIN RX_EN RX_EN...

  • Page 111: Schematic Diagram (Base Unit_Main)

    KX-TG5431BXS / KX-TGA542BXS 4.0V REFERENCE 1XX : TEL LINE 3XX : POWER, CHARGE, 4XX : RESET,MIC, SP 5XX : DSP,RF I/F 4.0V CONVERTOR IC331 Q300 6XX : FLASH, KEY, LCD VCC 3.3V L300 7XX : RF(2.4G) VOUT 22uH 8XX : RF(5.8G)
  • Page 112 KX-TG5431BXS / KX-TGA542BXS 36 SCHEMATIC DIAGRAM (BASE UNIT_RF PART) R856 10K R809 22K 4.0V TX-Amp. ANT-SW. 5.8GHz RF C852 K0.01 C851 J100P C891 R808 C854 K1000P 7 SW1 VCC1 8 SW2 5.8GHz RF GN D 9 ANT1 IC851 GN D...
  • Page 113 KX-TG5431BXS / KX-TGA542BXS SHIELD L860 V_RF (VPA) PA_CONT CON_EN RF-Reg. IF-Reg. 4.0V IC841 IC761 C846 C766 RADIO_EN L768 Vcc_TX V_RF VOUT VOUT 3.0V Reg 2.5V_REG SYN_LE2 2.4GHz IF SYN_OUT 2.5V SYN_DATA C751 D10P SYN_LE1 C752 K470P SYN_CLK C707 K1000P C714...
  • Page 114 KX-TG5431BXS / KX-TGA542BXS 37 SCHEMATIC DIAGRAM (BASE UNIT_OPERATION) SEG12 SEG11 SEG10 SEG9 SEG8 SEG7 SEG6 SEG5 SEG4 SEG3 COM2 COM1 2APVCC LED904 MSG_LED LED907 ANS_LED INUSE_LED LED901 CHARGE CHG_LED INT_LED KEYIN1 KEYIN2 KIN3 KEYIN3 ANS2 KEYIN4 KEYIN5 KEYIN6 MSG2 KEYS_F...
  • Page 115 KX-TG5431BXS / KX-TGA542BXS Memo...

  • Page 116: Schematic Diagram (Handset_Main)

    KX-TG5431BXS / KX-TGA542BXS 38 SCHEMATIC DIAGRAM (HANDSET_MAIN) to RF PART OSC_IN RSSI C246 K0.1 TX_DATA PA_CONT RX_EN TX_EN RX_GAIN RX_DATA CON_EN SYN_LE2 RADIO_EN IC249 SHCTRL RF_RESET RA201 SYN_DATA RESET 4.7K SYN_LE1 R249 FLASH_BOOT SYN_CLK SYN_OUT V_RF BACK FLASH LEFT TALK...
  • Page 117 KX-TG5431BXS / KX-TGA542BXS C346 K0.1 R342 39K Q341 TEST SIGNAL FREQUENCY:1KHz Headset TX -37dBm/600 50mVp-p R331 L331 HEADSET_JACK L332 MIC1 Q331 MIC2 R226 R227 L334 R225 X201 Headset RX CN331 13.824MHz 170mVp-p/150 HEADSET-DET (Vol. MAX) R201 NC HANDSET SP R323 C203 K0.1...
  • Page 118 KX-TG5431BXS / KX-TGA542BXS 39 SCHEMATIC DIAGRAM (HANDSET_RF PART) R856 4.7K R809 3.3V TX-Amp. ANT-SW C852 K0.01 C851 J100P C891 B0.2P R808 C854 K1000P VCC1 5.8GHz RF ANT1 10 GND IC851 VCC0 FL811 11 GND 12 ANT2 PAIN 5.8GHz TX C896 5.8GHz-RF...

  • Page 119: Schematic Diagram (Handset_Rf Part)

    KX-TG5431BXS / KX-TGA542BXS SHIELD L860 PA_CONT CON_EN RF-Reg. 3.6~4.2V IF-Reg. IC761 IC841 C846 C766 RADIO_EN L768 Vcc_TX V_RF VOUT VOUT 3.0V Reg 2.5V_REG SYN_LE2 2.4GHz IF SYN_OUT SYN_DATA 2.5V C751 D10P SYN_LE1 C752 K470P SYN_CLK C707 K1000P C714 K1000P C708 C1.5P...
  • Page 120 KX-TG5431BXS / KX-TGA542BXS Memo...

  • Page 121: Circuit Board (Base Unit_Main)

    40 CIRCUIT BOARD (BASE UNIT_MAIN) 40.1. Component View 3.0V 2.5V Vcc_5.8G Vcc_2.4G RF_Vcc A RSSI AC_DOWN 2 ANT0 CN101 SA101 SHIELD D301 C301 C302 SA102 IC841 IC761 IC851 D371 C382 C305 D362 Q361 L371 SA104 C371 R308 Q373 R361 C110 C361 L361 C306...

  • Page 122: Flow Solder Side View

    40.2. Flow Solder Side View PQUP11294Z KIN4 MIC- MIC+ /K13 DVCC INUSE/KI2 CHG/KS_D 2APVCC DCM2 DCP DCP2 KX-TG5431 CIRCUIT BOARD (Base Unit_Main (Flow Solder Side View))

  • Page 123: Circuit Board (Base Unit_Operation)

    41 CIRCUIT BOARD (BASE UNIT_OPERATION) 41.1. Component View CN901 KX-TG5431 CIRCUIT BOARD (Base Unit_Operation (Component View))

  • Page 124: Flow Solder Side View

    41.2. Flow Solder Side View KX-TG5431 CIRCUIT BOARD (Base Unit_Operation (Flow Solder Side View))

  • Page 125: Circuit Board (Base Unit_Rf Part)

    42 CIRCUIT BOARD (BASE UNIT_RF PART) SHIELD C764 C765 C890 C845 C851 C843 C857 C859 IC841 IC761 C891 R847 C844 C763 L860 C852 L768 C842 C858 C761 C846 IC851 C769 C841 C766 C768 R809 R808 C854 C735 C762 C748 R747 C747 C809 C713...
  • Page 126 Memo...

  • Page 127: Circuit Board (Handset_Main)

    43 CIRCUIT BOARD (HANDSET_MAIN) 43.1. Component View VBAT 1 3.5~4.2V 3.3V (Battery) INT_1 V_RF VBAT R242 R354 RA251 C264 PQUP11290Z C242 L326 D354 IC241 C263 R353 C361 D326 R243 R207 SP-PHONE CA274 R352 R205 L352 D352 R208 R206 C354 C209 R241 C243 D327...

  • Page 128: Flow Solder Side View

    43.2. Flow Solder Side View LED254 LED253 LED252 LED251 PQUP11290Z KX-TGA542 CIRCUIT BOARD (Handset_Main (Flow Solder Side View))

  • Page 129: Circuit Board (Handset_Rf Part)

    44 CIRCUIT BOARD (HANDSET_RF PART) SHIELD C764 C765 C890 C845 C851 C857 C843 C859 IC841 IC761 C891 R847 C844 C763 L860 C852 L768 C842 C858 C761 C846 IC851 C769 C841 C766 C768 R809 R808 C854 C735 C762 C748 R747 C747 C809 C713 C711...
  • Page 130 KX-TG5431BXS / KX-TGA542BXS KXTG5431BXS KXTGA542BXS...

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