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Panasonic KX-TG7741S Service Manual
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Panasonic KX-TG7741S Service Manual

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KX-TGA470S
(Handset)
(Charger Unit)
Configuration for each model
Model No
Base Unit
Handset
KX-TG7741 1 (TG7741) 1 (TGA470)
KX-TG7742 1 (TG7741) 2 (TGA470)
KX-TG7743 1 (TG7741) 3 (TGA470)
KX-TGA470*
1 (TGA470)
*KX-TGA470 is also an optional accessory, which contains a
handset and a charger.
KX-TG7741S
(Base Unit)
Charger Unit Expandable
Up to 6
1
Up to 6
2
Up to 6
1
Telephone Equipment
KX-TG7741S
Model No.
KX-TG7742S
KX-TG7743S
KX-TGA470S
Link-to-Cell Cellular Convergence
Solution
S: Silver Version
(for U.S.A.)
© Panasonic System Networks Co., Ltd. 2012
Unauthorized copying and distribution is a violation
of law.
ORDER NO. KM41201533CE
F13

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Summary of Contents for Panasonic KX-TG7741S

  • Page 1 KX-TG7743 1 (TG7741) 3 (TGA470) Up to 6 KX-TGA470* 1 (TGA470) *KX-TGA470 is also an optional accessory, which contains a handset and a charger. © Panasonic System Networks Co., Ltd. 2012 Unauthorized copying and distribution is a violation of law.
  • Page 2 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S WARNING This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electricity should be serviced or repaired only by experienced professional technicians.

  • Page 3: Table Of Contents

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S TABLE OF CONTENTS PAGE PAGE 1 Safety Precautions----------------------------------------------- 4 15.2. Circuit Board (Base Unit_Operation)---------------- 83 1.1. For Service Technicians --------------------------------- 4 15.3. Circuit Board (Handset_Main) ------------------------ 84 2 Warning -------------------------------------------------------------- 4 15.4. Circuit Board (Handset_LED) ------------------------- 86 2.1. Battery Caution--------------------------------------------- 4 15.5.

  • Page 4: Safety Precautions

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 1 Safety Precautions 1.1. For Service Technicians • Repair service shall be provided in accordance with repair technology information such as service manual so as to prevent fires, injury or electric shock, which can be caused by improper repair work.

  • Page 5: Discarding Of P. C. Board

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 2.2.1. Suggested PbF Solder There are several types of PbF solder available commercially. While this product is manufactured using Tin, Silver, and Copper (Sn+Ag+Cu), you can also use Tin and Copper (Sn+Cu), or Tin, Zinc, and Bismuth (Sn+Zn+Bi). Please check the manufacturer's specific instructions for the melting points of their products and any precautions for using their product with other materials.

  • Page 6: Specifications

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 3 Specifications ■ Standard: ■ Bit rate: DECT 6.0 (Digital Enhanced Cordless 1.152Mbit/s (DECT 6.0) Telecommunications 6.0) 1.0 Mbit/s (Bluetooth) Bluetooth wireless technology 2.0 ■ Modulation: ■ Number of channels: GFSK (Gaussian Frequency Shift Keying) 60 Duplex Channels (DECT 6.0) ■...

  • Page 7: Technical Descriptions

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 4 Technical Descriptions 4.1. Circuit Configuration of TG774x Series Phones TG774x consists of DECT cordless telephone and Bluetooth Module. Both voices of transmission and reception are transferred by PCM. BBIC on DECT side controls the cordless telephone system, which makes control data communication with BT_IC on BT Module in serial data.

  • Page 8: Dect Description

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 4.2. US-DECT Description The frequency range of 1.92 GHz-1.93 GHz is used. Transmitting and receiving carrier between base unit and handset is same frequency. Refer to Frequency Table (P.64). 4.2.1. TDD Frame Format 5 ms 5 ms Up Link ( Handset - > Base Unit ) Down Link ( Base Unit - >...
  • Page 9 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 4.2.3. Signal Flowchart in the Radio Parts Reception Base unit: A voice signal from TEL line is encoded to digital data and converted into a 1.9GHz modulated radio signal by BBIC(IC501). The RF signal, after which is amplified in BBIC, is fed to selected antenna.

  • Page 10: Block Diagram (Base Unit_Main)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 4.3. Block Diagram (Base Unit_Main)

  • Page 11: Tel Interface Circuit

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 4.4. Tel Interface Circuit...

  • Page 12: Block Diagram (Base Unit_Rf Part)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 4.5. Block Diagram (Base Unit_RF Part)

  • Page 13: Circuit Operation (Base Unit)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 4.6. Circuit Operation (Base Unit) General Description: (BBIC, Flash Memory, EERROM) 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. The BBIC system is fully controlled by a host processor. The host processor provides activation and control of all that functions as follows.
  • Page 14 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 4.6.6. Power Supply Circuit/Reset Circuit The power supply voltage from AC adaptor is converted to VBAT (3.0V) in IC302. And +3.0V for peripherals and analog part is insulated from VBAT by Doubler of BBIC. Circuit Operation: VDD4 +5.5V +3.0V...
  • Page 15 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 4.6.6.1. Charge Circuit The voltage from the AC adaptor is supplied to the charge circuits. +5.5V F301 R373 CHARGE+ C351 CHARGE-...
  • Page 16 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 4.6.7. Telephone Line Interface Telephone Line Interface Circuit: Function • Bell signal detection • ON/OFF hook and pulse dial circuit • Side tone circuit Bell (RINGING) signal detection and OFF HOOK circuit: In the idle mode, Q141 is open to cut the DC loop current and decrease the ring load. When ring voltage appears at the Tip (T) and Ring (R) leads (When the telephone rings), the AC ring voltage is transferred as follows: L1T→L101→C105→R105→R110→R111→R112→BBIC pin18(RINGING)
  • Page 17 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 4.6.8. Parallel Connection Detect Circuit/Auto Disconnect 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 18 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 4.6.9. Calling Line Identification (Caller ID)/Call Waiting Caller ID Function: Caller ID 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 19 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S Call Waiting Caller ID Calling Identity Delivery on Call Waiting (CIDCW) is a CLASS service that allows a customer, while off-hook on an existing call, to receive information about a calling party on a waited call. The transmission of the calling information takes place almost immediately after the customer is alerted to the new call so he/she can use this information to decide whether to take the new call.

  • Page 20: Block Diagram (Handset)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 4.7. Block Diagram (Handset) VBAT ANT1 EEPROM 13.824 MHz VBAT CHG_DET RF part CHG_CTL RXON RSTN RESET TXON CHARGE VBAT BATTERY BBIC Receiver HSSPOUTP Headset Jack LOUT HSMIP 4.0V CN431 VBAT CHARGE HEADSET_DET (KEY) CP_OFF PUMP (BELL) KEY_LED BELL_LED...

  • Page 21: Block Diagram (Handset_Rf Part)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 4.8. Block Diagram (Handset_RF Part) TXON DA801 RXON KX-TGA470 BLOCK DIAGRAM (Handset_RF Part)

  • Page 22: Circuit Operation (Handset)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 4.9. Circuit Operation (Handset) 4.9.1. Outline Handset consists of the following ICs as shown in Block Diagram (Handset) (P.20). • DECT BBIC (Base Band IC): IC1 - All data signals (forming/analyzing ACK or CMD signal) - All interfaces (ex: Key, Detector Circuit, Charge, EEPROM, LCD) •...

  • Page 23: Circuit Operation (Charger Unit)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 4.9.3. Charge Circuit Circuit Operation: When charging the handset on the Base Unit, the charge current is as follows; DC+(6.5 V) → F301 → R371 → R372 →CHARGE+(Base) → CHARGE+(Handset) → Q4 → D7→ F1 → BATTERY+... Battery... BATTERY- → R45 → GND → CHARGE-(Handset)→ CHARGE-(Base) → GND → DC-(GND) In this way, the BBIC on Handset detects the fact that the battery is charged.

  • Page 24: Signal Route

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 4.11. Signal Route ROUTE SIGNAL ROUTE HANDSET TX HANDSET MIC - R73/74 - C11/13 - RA4 - IC1(22/23) - <HANDSET_RF_TX_ROUTE> - ANT. --- ANT. - <BASE_UNIT_RF_RX_ROUTE> - IC501(2/3 - 27) - C184 - Q161 -Q141 - D101 - L101/[L102-P101] - T/R (TEL LINE)
  • Page 25 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S RF part signal route SIGNAL ROUTE ROUTE INTERCOM HANDSET MIC - R73/74 - C11/13 - RA4 - IC1(22/23) - <HANDSET_RF_TX_ROUTE> - ANT. --- HANDSET TO BASE UNIT ANT - <BASE_UNIT_RF_RX_ROUTE> - IC501(2/3 - 41/43) - SPEAKER INTERCOM MIC - C457/C458 - RA452 - IC501(37/38 - 94/95) - <BASE_UNIT_RF_TX_ROUTE> - ANT BASE UNIT --- ANT.

  • Page 26: Location Of Controls And Components

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 5 Location of Controls and Components Refer to the Operating Instructions. Note: You can download and refer to the Operating Instructions (Instruction book) on TSN Server. 6 Installation Instructions Refer to the Operating Instructions. Note: You can download and refer to the Operating Instructions (Instruction book) on TSN Server.

  • Page 27: Test Mode

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 8 Test Mode 8.1. Engineering Mode 8.1.1. Base Unit Important: Make sure the address on LCD is correct when entering new data. Otherwise, you may ruin the unit. Soft keys {FLASH} {FLASH} {CALL WAIT} {CALL WAIT} Naviga tor key/...
  • Page 28 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S Set Addr.: 7). Press , a long confirmation beep New Data will be heard. CLEAR 8). Press {OFF} to return to standby mode. Set Addr.: After that, turn the base unit power off and then power on. _ _ _ _ BACK or {>} at "...
  • Page 29 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 8.1.2. Handset Important: Make sure the address on LCD is correct when entering new data. Otherwise, you may ruin the unit. Soft keys {FLASH} {FLASH} {CALL WAIT} {CALL WAIT} Naviga tor key/ (Volume) key {OFF} {OFF} Dial keypad Dial keypad...
  • Page 30 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S Frequently Used Items (Handset) ex.) Items Address Default Data New Data Possible Adjusted Possible Adjusted Remarks Value MAX (hex) Value MIN (hex) Battery Low 00 12/00 13 00 / 00 (*2) Frequency 00 07 / 00 08 00 / 01...

  • Page 31: Service Mode

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 9 Service Mode 9.1. How to Clear User Setting (Handset Only) Handset Press simultaneously until a beep sound is heard. Then single handset is initialized. (The contents of user setting are reset to factory default) *Usage time is not cleared.

  • Page 32: Troubleshooting Guide

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 10 Troubleshooting Guide 10.1. Troubleshooting Flowchart FLOW CHART Not working Power ON Base Unit Check Power Not record (*1) Record Check Record Not playback Playback Pre-Message Check Playback Link No link No charge Battery Charge Check Battery Charge Check Link...
  • Page 33 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 10.1.1. Check Power 10.1.1.1. Base Unit Is the AC Adaptor inserted into AC outlet? (*1) AC Adaptor. Is output voltage of AC adaptor 5.5 V? Check Check Power Supply Circuit. Check VDD1(1.8V) :Test point (VDD1) RSTN: Reset = "High"? Check Reset Circuit.
  • Page 34 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 10.1.2. Check Record 10.1.2.1. Base Unit Not record Incoming Message Check Telephone Line Interface Check Bell signal. [Bell]. Check Telephone Line Interface Does the unit catch line? [OFF HOOK]. Check Line In: Pin 25 of BBIC. Check ICM Recording in Signal Route.
  • Page 35 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S <How to change the Auto Disconnect activation time and VOX level> A) 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 36 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S B) Vox level: It makes easier to detect a small voice (caller) by raising the sensitivity of VOX level. Therefore, the recording of TAM is not turned off during a detection. 1) ~ 2) are same as (A). 3) Press "5","1","1".
  • Page 37 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 10.1.3. Check Playback 10.1.3.1. Base Unit Check VDD1(1.8V) :Test point (VDD1) Check Power Supply Circuit. Check output of BBIC (Pin 41,43). Check BBIC and Flash Memory. Check Speaker and its surroundings. Cross Reference: Note: Power Supply Circuit/Reset Circuit (P.14) Flash Memory is IC601.
  • Page 38 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 10.1.5. Check Link 10.1.5.1. Base Unit Does Base Unit make link with normal working Base Unit is OK. Check Handset. Handset? Is the voltage of VDD3 about 3.0V? Check around Power Supply Circuit. Is the voltage of VDD1 about 1.8V? Does the RF clock (CLK) oscillate at 10.368 MHz in...
  • Page 39 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 10.1.5.2. Handset Does Handset make link with Base Unit? Handset is OK. Check Base Unit. (Correct working unit) Is the voltage of TP VBAT about 2.2~2.8 V? Check the batteries. Check around Power Supply Circuit/Reset Circuit. Is the voltage of TP VDDC about 1.8 V? Is the voltage of TP 3.0 V about 3.0 V?
  • Page 40 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 10.1.6. Check the RF part 10.1.6.1. Finding out the Defective part 1. Prepare Regular HS(*1) and Regular BU(*2). 2. a. Re-register regular HS (Normal mode) to base unit (to be checked). If this operation fails in some ways, the base unit is defective.
  • Page 41 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 10.1.6.2. RF Check Flowchart Each item (1 ~ 5) of RF Check Flowchart corresponds to Check Table for RF part (P.42). Please refer to the each item. Start Link Control Check BBIC interface parts. confirmation signal (RF Block <->BBIC on BU/HS P.C.B)
  • Page 42 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 10.1.6.3. Check Table for RF part Item BU (Base Unit) Check HS (Handset) Check Link Confirmation Normal 1. Register Regular HS to BU (to be 1. Register HS (to be checked) to Regular checked). HS, BU Mode [Normal Mode] 2.
  • Page 43 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 10.1.6.4. 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 TEST 1. Register Regular HS to BU (to be checked). 1. Register HS (to be checked) to Regular BU.
  • Page 44 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 10.1.7. Registering a Handset to the Base Unit The supplied handset and base unit are pre-registered. If for some reason the handset is not registered to the base unit, re-register the handset. 1 Handset: {MENU} i # 1 3 0...
  • Page 45 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 10.1.9. Check Handset Transmission Check MIC of handset. Check handset Tx in Signal Route. Cross Reference: Signal Route (P.24) 10.1.10. Check Handset Reception Check speaker of handset. Check handset Rx in Signal Route. Cross Reference: Signal Route (P.24) Note: When checking the RF part, Refer to Check the RF part (P.40).
  • Page 46 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 10.1.12. Check BT Communication Plug in the AC power source and wait 10 seconds. Operate to enter the menu of "Bluetooth" by using a handset Press [MENU] Bluetooth [SELECT] Is it possible to enter the menu of "Bluetooth"? Check the circuit of around RF parts of BT...
  • Page 47 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S Case1: OK AC power on PIO01 3.6sec 0.06sec 2.8sec 1.4sec Case2: NG1(fail to reset BT_IC) AC power on If BT_IC does not work, 1st and 2nd signals does not appear. Check the circuit of around PIO01 POWER and RESET parts of BT Module.

  • Page 48: Disassembly And Assembly Instructions

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 11 Disassembly and Assembly Instructions 11.1. Disassembly Instructions 11.1.1. Base Unit Remove the 5 screws to remove the cabinet cover. Remove the solders. Cabinet cover Solders Remove the screw and pararell wire to remove the main P.C. board.
  • Page 49 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S Remove the 2 screws to remove the Jack holder. Remove the 4 screws to remove the operational P.C.B board.
  • Page 50 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 11.1.2. Handset 2 screws Remove the 2 screws. Insert a plastic card. (Ex. Used SIM card etc.) Cabinet body between the cabinet body and the cabinet cover, then pull it along the gap to open the cabinet. Cabinet cover Likewise, open the other side of the cabinet.
  • Page 51 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 11.1.3. Charger Unit 2 charge terminals...

  • Page 52: How To Replace The Base Unit Lcd

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 11.2. How to Replace the Base unit LCD Fit the heatseal of a new LCD. Vertical Interval Tolerance 0.2mm Horizontal Interval Tolerance 0.2mm If interval tolerance between center lines is less than 0.2 mm, it is o.k. New LCD (Inclined) Operational P.C.B.
  • Page 53 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S Attach the LCD and fix by hook A (two points).

  • Page 54: How To Replace The Handset Lcd

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 11.3. How to Replace the Handset LCD Note: The illustrations are simplified in this page. They may differ from the actual product. P. C. board Vertical Interval Tolerance Peel off the FFC (Flexible Flat Cable) from 0.2 mm the LCD, in the direction of the arrow. Take care to ensure that the foil on the P.C.

  • Page 55: Measurements And Adjustments

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 12 Measurements and Adjustments This chapter explains the measuring equipment, the JIG connection, and the PC setting method necessary for the measurement in Troubleshooting Guide (P.32) 12.1. Equipment Required • Digital multi-meter (DMM): it must be able to measure voltage and current.
  • Page 56 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 12.2.2. Connections (Handset) Connect the DC Power or Battery to BATT+ and BATT-. Connect the JIG cable GND (black) to GND. Connect the JIG cable UTX (yellow) to UTX and URX (red) to URX. URX (red) To Serial Port...
  • Page 57 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 12.2.3. How to install Batch file into P.C. Insert the Batch file CD-ROM into CD-ROM drive and copy PNZZTG**** folder to your PC (example: D drive). <Example for Windows> On your computer, click [Start], select Programs Open an MS-DOS mode window.
  • Page 58 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 12.2.4. Commands See the table below for frequently used commands. Command name Function Example XBT 0 Base unit only. Type "sendchar XBT 0". For excluding failure of command response. Please send this command at first before other command is executed.

  • Page 59: Adjustment Standard (Base Unit)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 12.3. Adjustment Standard (Base Unit) When connecting the simulator equipment for checking, please refer to below. 12.3.1. Bottom View UART Oscilloscope C552 UTX URX C721 C521 Q732 R733 ANT1_TP Spectrum Analyzer Q731 C731 R735 R736 ANT2_TP C301 ANT_C3 R721 F301 3.0A...

  • Page 60: Adjustment Standard (Charger Unit)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 12.4. Adjustment Standard (Charger Unit) When connecting the simulator equipment for checking, please refer to below. 12.4.1. Bottom View Digital Volt Meter /2 W DC POWER DC 5.5 V...

  • Page 61: Adjustment Standard (Handset)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 12.5. Adjustment Standard (Handset) When connecting the simulator equipment for checking, please refer to below. 12.5.1. Component View LED11 LED10 LED12 ANT_TP C801 RESET C804 C802 C814 C812 C813 C810 C822 C820 R807 C805 C806 ATSTP CKM/STM GND_J RSTN C96 C97 3.0V...

  • Page 62: Things To Do After Replacing Ic Or X'tal

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 12.6. Things to Do after Replacing IC or X'tal If repairing or replacing EEPROM and X'tal, it is necessary to download the required data such as Programming data or adjustment data, etc. in memory. The set doesn't operate if it is not executed.
  • Page 63 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 12.6.1.2. Handset First, operate the PC setting according to The Setting Method of JIG (P.55). Then download the appropriate data according to the following procedures. Items How to download/Required adjustment EEPROM (IC3) Adjusted parameter data is stored in memory.

  • Page 64: Frequency Table

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 12.7. Frequency Table Ch. (hex) TX/RX Frequency (MHz) Channel 0 1928.448 Channel 1 1926.720 Channel 2 1924.992 Channel 3 1923.264 Channel 4 1921.536...

  • Page 65: Bluetooth Frequency Table

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 12.8. Bluetooth Frequency Table Frequency (MHz) Frequency (MHz) Frequency (MHz) 2402 2435 2468 2403 2436 2469 2404 2437 2470 2405 2438 2471 2406 2439 2472 2407 2440 2473 2408 2441 2474 2409 2442 2475 2410 2443 2476 2411 2444...

  • Page 66: Miscellaneous

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 13 Miscellaneous 13.1. How to Replace the LLP (Leadless Leadframe Package) IC Note: This description is only applied on the model with Shield case. 13.1.1. Preparation • PbF (: Pb free) Solder • Soldering Iron Tip Temperature of 700 °F ± 20 °F (370 °C ± 10 °C) Note: We recommend a 30 to 40 Watt soldering iron.
  • Page 67 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 13.1.4. How to Install the IC 1. Place the solder a little on the land where the radiation GND pad on IC bottom is to be attached. Soldering Iron Land Solder P.C.Board 2. Place the solder a little on the land where IC pins are to be attached, then place the IC.

  • Page 68: How To Replace The Flat Package

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 13.2. 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 69 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 13.2.3. How to Install the IC 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 70: Terminal Guide Of The Ics, Transistors And Diodes

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 13.3. Terminal Guide of the ICs, Transistors and Diodes 13.3.1. Base Unit (Reverse View) PNWI1TG7741H PNWI2TG7741H C0JBAQ000247 C0DBEYY00102 C1CB00003663 PNWI3TG7741H B1ACGP000008 B1ABDM000001, B1ADGE000012 2SC6054JSL, DRC9113Z0L 2SA1576S, B1GBCFYY0020 DSC7003S0L PSVTUMG11NTR PQVDMD5S Cathode Cathode Cathode Anode Cathode Anode Anode Anode B3AAB0000347...

  • Page 71: Schematic Diagram

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 14 Schematic Diagram 14.1. For Schematic Diagram 14.1.1. Base Unit (Schematic Diagram (Base Unit_Main)) Notes: 1. DC voltage measurements are taken with voltmeter from the negative voltage line. Important Safety Notice: Components identified by mark have special characteristics important for safety.

  • Page 72: Schematic Diagram (Base Unit_Main)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 14.2. Schematic Diagram (Base Unit_Main) +3.0V C751 0.1u IC751 SP_LED 1 QB BT_HS_LED(R) 2 QC BT_HS_LED(G) SPI2_DO 3 QD R753 CELL1_LED(R) 4 QE *RCLR CELL1_LED(G) IO_LE 5 QF CELL2_LED(R) SPI2_CLK 6 QG Q653 CELL2_LED(G) IO_CLR 7 QH BT_HS_LED(R) *SCLR...
  • Page 73 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S Q141 REFERENCE R160 1XX : TEL LINE 3XX : POWER, CHARGE 4XX : MIC, SP Q161 5XX : BBIC R141 6XX : FLASH, EEPROM, KEY, LCD 7XX : FOR DK/BT 100k 8XX : RF C165 NC C163 NC C173...

  • Page 74: Schematic Diagram (Base Unit_Rf)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 14.3. Schematic Diagram (Base Unit_RF) ANT_1 ANT_2 ANT1_TP ANT2_TP C853 C851 W 0.15mm W 0.15mm L 22+/-4mm L 22+/-4mm 1st or 4th layer 1st or 4th layer DA802 GNDGND W 0.15mm L 20+/-2mm 3rd layer R807 RXON C826 C863...

  • Page 75: Schematic Diagram (Base Unit_Operation)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 14.4. Schematic Diagram (Base Unit_Operation) R901 LED905 R902 LED906 R903 LED907 CN901 R904 LED908 C901 *LED911 CELL1_LED(R) /RSTB *LED916 BT_HS_LED(G) /CSB *LED915 BT_HS_LED(R) LED902 MEG_LED LED901 ANS_LED SCLK VDD1 LCD_BLT VDD2 LCD_GND 13pin:TG4741 16pin:TG7741 LCD_RST LCD_CS LCD_CD CELL1_2 CELL2_2...

  • Page 76: Schematic Diagram (Handset_Main)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 14.5. Schematic Diagram (Handset_Main) Charge Current VBAT VBAT BAT+ 2.5A BAT- Battery CHG_CUR When on Charge CP3V 0.1u 3.3k EEP_WP EEP_WP E_WP EEP_SCL EEP_SCL E_SCL 1000p EEP_SDA EEP_SDA E_SDA CHG+ *IC3 CHG+ * Start Monitor CHARGE * When "SFR" command...
  • Page 77 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S RF BLOCK ANT-Short-GND R807 ANT-Short RXON W 0.15mm ANT-Pattern L 20mm W 0.15mm/L 7mm 3rd layer W 0.5mm /L 5mm C826 1st layer RX_RF C803 1.3p C812 L809 8.2n DA801 W 0.15mm TX_RF L 20mm 3rd layer W 0.2mm R806 L 10.0mm...

  • Page 78: Schematic Diagram (Handset_Led)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 14.6. Schematic Diagram (Handset_LED) KX-TGA470 SCHEMATIC DIAGRAM (Handset_LED)

  • Page 79: Schematic Diagram (Charger Unit)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 14.7. Schematic Diagram (Charger Unit) 1 (0.5W) 1 (0.5W) SCHEMATIC DIAGRAM (Charger Unit)
  • Page 80 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S Memo...

  • Page 81: Printed Circuit Board

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 15 Printed Circuit Board 15.1. Circuit Board (Base Unit_Main) 15.1.1. Component View C851 C843 C306 IC302 ANT_2 ANT_1 IC721 R781 BT_CTS C782 C853 BT_URX R791 TP_ANT_C3 P101 C844 SA101 DA802 CELL1_LED(R) CELL1_LED(G) BT_HS_LED(G) CELL2_LED(R) C858 R753 C751 SA103 C841...
  • Page 82 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 15.1.2. Bottom View For JIG BT_01 C552 UTX URX C721 C521 Q732 R733 ANT1_TP C731 Q731 R735 R736 ANT2_TP C301 ANT_C3 R721 F301 3.0A +5.5V ANT_BT TP_ANT_BT R751 Q652 Q653 IC611 C115 L661 C663 C662 R611 C664 C611 C602...

  • Page 83: Circuit Board (Base Unit_Operation)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 15.2. Circuit Board (Base Unit_Operation) TG774xH PNLB2050Z TG474xH C903 R902 LED908 R904 LED906 R903 R901 LED905 LED907 LED901 C902 C901 HOLD/CONF ERASE/MUTE REDIAL/PAUSE STOP LOCAT/INT FLASH MSG1 MSG2 SKIP LED902 C910 MSG3 MSG4 DOWN MIC- MIC+ LED904 KX-TG7741/7742/7743 CIRCUIT BOARD (Base Unit_Operation (Component View))

  • Page 84: Circuit Board (Handset_Main)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 15.3. Circuit Board (Handset_Main) 15.3.1. Component View LED11 LED10 LED12 ANT_TP C801 ANT-TP RESET ANT-GND C804 C802 C814 C812 C813 C810 C822 C820 R807 C805 C806 ATSTP CKM/STM CKM/STM GND_J RSTN (CLK:13.824MHz) C96 C97 3.0V (Output) 3.0V VBAT_MON VBG/CHG_MON...
  • Page 85 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 15.3.2. Bottom View CN3_C PNLB2012Z LED7 LED9 LED9 SOFT_A SOFT_B SOFT_C FLASH LED1 LED2 LEFT RIGHT DOWN TALK KX-TGA470 CIRCUIT BOARD (Handset_Main (Bottom View))

  • Page 86: Circuit Board (Handset_Led)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 15.4. Circuit Board (Handset_LED) PNLB1964Z KX-TGA470 CIRCUIT BOARD (Handset_LED (Component View))

  • Page 87: Circuit Board (Charger Unit)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 15.5. Circuit Board (Charger Unit) 15.5.1. Component View CIRCUIT BOARD (Charger Unit (Component View)) 15.5.2. Bottom View CIRCUIT BOARD (Charger Unit (Bottom View))

  • Page 88: Exploded View And Replacement Parts List

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 16 Exploded View and Replacement Parts List 16.1. Cabinet and Electrical Parts (Base Unit) E1 (*1) PCB1 MIC1 PCB2 Ref.No. Figure 2.6 x 8mm Note: (*1) This cable is fixed by welding. Refer to How to Replace the Base unit LCD (P.52).

  • Page 89: Cabinet And Electrical Parts (Handset)

    (*1) This cable is fixed by welding. Refer to How to Replace the Handset LCD (P.54). (*2) The rechargeable Ni-MH battery HHR-4DPA is available through sales route of Panasonic. (*3) Attach the SPACER (No. 121) to the exact location described above.

  • Page 90: Cabinet And Electrical Parts (Charger Unit)

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 16.3. Cabinet and Electrical Parts (Charger Unit) 200-1 PCB200 200-3 200-2 200-4 Ref.No. Figure 2×8 mm φ...

  • Page 91: Accessories And Packing Materials

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 16.4. Accessories and Packing Materials 16.4.1. KX-TG7741S A3, A4...
  • Page 92 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 16.4.2. KX-TG7742S A105 A102 A106 P103 P102 A101 P102 A101 A103, A104 P101...
  • Page 93 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 16.4.3. KX-TG7743S A206 A205 A201 P202 A202 P202 P203(*1) A203, A204 P202 P201 Note: (*1) This pad is a piece of Ref No.P201 (GIFT BOX).
  • Page 94 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 16.4.4. KX-TGA470S A303 P302 (*1) A302 A301 P301 Note: (*1) This pad is a piece of Ref No.P301 (GIFT BOX).

  • Page 95: Replacement Parts List

    KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 16.5. Replacement Parts List Safety Ref. Part No. Part Name & Description Remarks 1. RTL (Retention Time Limited) PNJK1147Z KEYBOARD SWITCH, HEAD- Note: PNLA1047Z ANTENNA, SUB The “RTL” marking indicates that its Retention Time is PNLA1052Z ANTENNA, BT Limited.
  • Page 96 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks SA101 PQVDDSS301L VARISTOR (SURGE R658 D0GA122JA015 1.2k ABSORBER) R659 D0GA102JA021 1k (RESISTORS) R660 D0GA102JA021 1k R101 PQ4R10XJ475 4.7M R661 D0GA102JA021 1k...
  • Page 97 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks C475 ECUE1H222KBQ 0.0022 LED907 LNJ237W82RA C476 ECUE1H151JCQ 150p LED908 LNJ237W82RA C477 ECUE1H100DCQ 10p LED911 B3AAB0000347 LED C478 ECUE1H100DCQ 10p LED912 B3ABB0000331 LED...
  • Page 98 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks C0DBZYY00357 IC R807 ERJ2GEJ471 (TRANSISTORS) ERJ2GEJ100 B1ADCF000040 TRANSISTOR(SI) ERJ2GE0R00 B1ABGE000011 TRANSISTOR(SI) (CAPACITORS) B1ADCF000040 TRANSISTOR(SI) EEE0JA221WP DRC9113Z0L TRANSISTOR(SI) EEE0JA221WP DRC9113Z0L TRANSISTOR(SI) EEE0JA221WP...
  • Page 99 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S 16.5.4.1. KX-TG7741S Safety Ref. Part No. Part Name & Description Remarks C803 F1G1H1R3A480 1.3p C804 F1G1H1R8A480 1.8p Safety Ref. Part No. Part Name & Description Remarks C805 F1G1H2R4A480 2.4p C806 F1G1H2R4A480 2.4p PNLV226Z AC ADAPTOR C810 F1G1H2R5A480 2.5p PQJA10075Z...
  • Page 100 KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S Safety Ref. Part No. Part Name & Description Remarks PNZZTG7741M BATCH FILE CD-ROM (*1) PQZZ430PIR TIP OF SOLDERING IRON (*2) PQZZ430PRB RUBBER OF SOLDERING IRON (*2) T.I/N KXTG7741S KXTG7742S KXTG7743S KXTGA470S...

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