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Panasonic KX-TG7341BXM Service Manual
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Panasonic KX-TG7341BXM Service Manual

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Telephone Equipment
KX-TG7341BXM
Model No.
KX-TG7341BXT
KX-TGA731BXM
KX-TGA731BXT
KX-TGA731BXB
KX-TGA731BXF
KX-TGA731BXS
Digital Cordless Answering System
M:Metallic Grey Version
T:Titanium Black Version
B:Black Version
F:Metalic Blue Version
S:Silver Version
(for Asia, Middle Near East and other areas)
© Panasonic Communications Co., Ltd. 2008. Unau-
thorized copying and distribution is a violation of law.
ORDER NO. KM40809714CE

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Summary of Contents for Panasonic KX-TG7341BXM

  • Page 1 Digital Cordless Answering System M:Metallic Grey Version T:Titanium Black Version B:Black Version F:Metalic Blue Version S:Silver Version (for Asia, Middle Near East and other areas) © Panasonic Communications Co., Ltd. 2008. Unau- thorized copying and distribution is a violation of law.
  • Page 2 KX-TG7341BX/KX-TGA731BX...

  • Page 3: Table Of Contents

    KX-TG7341BX/KX-TGA731BX TABLE OF CONTENTS PAGE PAGE 1 Safety Precautions----------------------------------------------- 4 13.1. For Schematic Diagram -------------------------------- 78 1.1. For Service Technicians --------------------------------- 4 13.2. Schematic Diagram (Base Unit_Main)-------------- 80 2 Warning -------------------------------------------------------------- 4 13.3. Schematic Diagram (Base Unit_RF Part)---------- 82 2.1. Battery Caution--------------------------------------------- 4 13.4.

  • Page 4: Safety Precautions

    KX-TG7341BX/KX-TGA731BX 1 Safety Precautions 1.1. For Service Technicians • Repair service shall be provided in accordance with repair technology information such as technical guides so as to prevent fires, injury or electric shock, which can be caused by improper repair work. 1.

  • Page 5: Discarding Of P.c. Board

    KX-TG7341BX/KX-TGA731BX 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-TG7341BX/KX-TGA731BX 3 Specifications Note: • Specifications are subject to change. Note for Service: • Operation range: Up to 300 m outdoors, Up to 50 m indoors, depending on the condition. • Analog telephone connection: Telephone Line...

  • Page 7: Technical Descriptions

    KX-TG7341BX/KX-TGA731BX 4 Technical Descriptions 4.1. Block Diagram (Base Unit)

  • Page 8: Circuit Operation (Base Unit)

    KX-TG7341BX/KX-TGA731BX 4.2. Circuit Operation (Base Unit) 4.2.1. Outline Base Unit consists of the following ICs as shown in Block Diagram (Base Unit) (P.7). • DECT BBIC (Base Band IC): IC7 - Handling all the audio, signal and data processing needed in a DECT base unit - Controlling the DECT specific physical layer and radio section (Burst Module Controller section) - ADPCM code filter for speech encoding and speech decoding (DSP section) - Echo-cancellation and Echo-suppression (DSP section)
  • Page 9 KX-TG7341BX/KX-TGA731BX 4.2.2. Power Supply Circuit The power is supplied to the DECT BBIC, RF Module, EEPROM and Charge Contact from AC Adaptor (+6.5 V) as shown in Fig.101. The power supply is as follows; • DECT BBIC (IC7): DC Jack (+6.5 V) → IC1 → IC7 DC Jack (+6.5 V) →...
  • Page 10 KX-TG7341BX/KX-TGA731BX 4.2.3. Telephone Line Interface <Function> • Bell signal detection • Clip signal detection • ON/OFF hook circuit Bell & Clip (: Calling Line Identification Presentation: Caller ID) signal detection: In the standby mode, Q3 is open to cut the DC loop current and decrease the ring load. When ring voltage appears at the L1T (A) and L1R (B) leads (when the telephone rings), the AC ring voltage is transferred as follows;...

  • Page 11: Block Diagram (Handset)

    KX-TG7341BX/KX-TGA731BX 4.3. Block Diagram (Handset)

  • Page 12: Circuit Operation (Handset)

    KX-TG7341BX/KX-TGA731BX 4.4. Circuit Operation (Handset) 4.4.1. Outline Handset consists of the following ICs as shown in Block Diagram (Handset) (P.11). • DECT BBIC (Base Band IC): IC1 - All data signals (forming/analyzing ACK or CMD signal) - All interfaces (ex: Key, Detector Circuit, Charge, DC/DC Converter, EEPROM, LCD, RF Power Amp.) - PLL Oscillator - Detector - Compress/Expander...

  • Page 13: Circuit Operation (Charger Unit)

    KX-TG7341BX/KX-TGA731BX 4.5. Circuit Operation (Charger Unit) 4.5.1. Power Supply Circuit The power supply is as shown.

  • Page 14: Signal Route

    KX-TG7341BX/KX-TGA731BX 4.6. Signal Route...
  • Page 15 KX-TG7341BX/KX-TGA731BX...

  • Page 16: Location Of Controls And Components

    KX-TG7341BX/KX-TGA731BX 5 Location of Controls and 5.1.2. Handset Components 5.1. Controls 5.1.1. Base Unit...

  • Page 17: Installation Instructions

    KX-TG7341BX/KX-TGA731BX 6 Installation Instructions 6.1. Connections...

  • Page 18: Battery

    In that case, by recharging the battery as mentioned above, you will get a correct indication of the battery strength. 6.2.3. Battery Level 6.2.4. Panasonic Ni-MH Battery Performance (supplied batteries) See For Service Hint (P.25)

  • Page 19: Operating Instructions

    KX-TG7341BX/KX-TGA731BX 7 Operating Instructions 7.1. Programmable Settings *1 The item will not be reset when pressing key of the handset. Refer to How to Clear User Setting (P.32). *2 The item will not be reset when pressing keys. Refer to How to Clear User Setting (P.32). *3 If you program these settings using one of the handsets, you do not need to program the same item using another handset.

  • Page 20: Registering A Handset To The Base Unit

    KX-TG7341BX/KX-TGA731BX 7.1.1. Answering System Settings 7.2. Registering a Handset to the Base Unit Cross Reference: For Service Hint (P.25) 7.2.1. Deregistering a Handset...

  • Page 21: Copying Phonebook Entries

    KX-TG7341BX/KX-TGA731BX 7.3. Copying Phonebook Entries You can copy phonebook entries to the phonebook of another compatible Panasonic handset. 7.3.1. Copying All Entries 7.4. Dialling Mode (Tone/Pulse) 7.5. Error Messages...

  • Page 22: Troubleshooting

    KX-TG7341BX/KX-TGA731BX 7.6. Troubleshooting...
  • Page 23 KX-TG7341BX/KX-TGA731BX...
  • Page 24 KX-TG7341BX/KX-TGA731BX...

  • Page 25: For Service Hint

    KX-TG7341BX/KX-TGA731BX 7.7. For Service Hint Cross Reference: Battery Charge (P.18)

  • Page 26: Service Mode

    KX-TG7341BX/KX-TGA731BX 8 Service Mode 8.1. Engineering Mode 8.1.1. Base Unit...
  • Page 27 KX-TG7341BX/KX-TGA731BX Frequently Used Items (Base Unit) ex.) Items Address Default Data New Data Remarks C-ID (FSK) sensitivity 04 D6 01 (6 dB up) 02 (12 dB up) When hex changes from “00” to “01” or “02”, gain increases by 6 dB or 12 dB. C-ID (DTMF) sensitivity 04 E4 60 (6 dB up)
  • Page 28 KX-TG7341BX/KX-TGA731BX 8.1.2. Handset...
  • Page 29 KX-TG7341BX/KX-TGA731BX Frequently Used Items (Handset) ex.) Items Address Default Data New Data Possible Adjusted Possible Adjusted Remarks Value MAX (hex) Value MIN (hex) Sending level 00 06 Adjusted value Given value (*2) Receiving level 00 07 Adjust value Given value (*3) Battery Low 00 04...

  • Page 30: Copying Phonebook Items When Repairing

    KX-TG7341BX/KX-TGA731BX 8.2. Copying Phonebook Items when Repairing You can copy the handset phonebook to another (compatible Panasonic) handset. This will help to save the original phonebook data which the customer has registered. Available models: KX-TG7331/7341 Refer to the following procedures.
  • Page 31 KX-TG7341BX/KX-TGA731BX Note: • BS=Base Unit , HS=Handset • If the max number of handsets are already registered to the base unit, a new handset cannot be registered. • To register the handset, refer to Registering a Handset to the Base Unit (P.20) •...

  • Page 32: How To Clear User Setting

    KX-TG7341BX/KX-TGA731BX 8.3. 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.) Note: • Some menus are not reset. Refer to Operating Instructions (P.19). •...

  • Page 33: Troubleshooting Guide

    KX-TG7341BX/KX-TGA731BX 9 Troubleshooting Guide 9.1. Troubleshooting Flowchart Flow Chart Cross Reference: Check Power (P.34) Bell Reception (P.44) Check Battery Charge (P.35) Check Link (P.36) Check the RF part (P.40) Check Handset Transmission (P.43) Check Handset Reception (P.43) Signal Route (P.14) Check Caller ID (P.43) Check TAM Operation (P.44)
  • Page 34 KX-TG7341BX/KX-TGA731BX 9.1.1. Check Power 9.1.1.1. Base Unit Is the AC Adaptor inserted into AC outlet? (*1) Cross Reference: Note: Power Supply Circuit (P.9) (*1) Refer to Specifications (P.6) for part number and supply voltage of AC Adaptor. 9.1.1.2. Handset Cross Reference: Power Supply Circuit/Reset Circuit (P.12)
  • Page 35 KX-TG7341BX/KX-TGA731BX 9.1.2. Check Battery Charge 9.1.2.1. Base Unit Cross Reference: Charge Circuit (P.12) 9.1.2.2. Handset Cross Reference: Check Power (P.34) Charge Circuit (P.12) 9.1.2.3. Charger Unit Cross Reference: Charge Circuit (P.12)
  • Page 36 KX-TG7341BX/KX-TGA731BX 9.1.3. Check Link 9.1.3.1. Base Unit Note: (*1) Refer to Troubleshooting by Symptom (Base Unit and Charger Unit) (P.45) Cross Reference: Check Point (Base Unit) (P.45) Power Supply Circuit (P.9)
  • Page 37 KX-TG7341BX/KX-TGA731BX Cross Reference: Check Point (Base Unit) (P.45)
  • Page 38 KX-TG7341BX/KX-TGA731BX 9.1.3.2. Handset Cross Reference: Check Point (Handset) (P.49) Power Supply Circuit/Reset Circuit (P.12)
  • Page 39 KX-TG7341BX/KX-TGA731BX Cross Reference: Check Point (Handset) (P.49)
  • Page 40 KX-TG7341BX/KX-TGA731BX 9.1.4. Check the RF part 9.1.4.1. 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: If you need to register a handset, refer to Registering a Handset to the Base Unit (P.20)
  • Page 41 KX-TG7341BX/KX-TGA731BX 9.1.4.2. RF Check Flowchart Each item (1 ~ 3) of RF Check Flowchart corresponds to Check Table for RF part (P.42). Please refer to the each item. Note: (*1) Base unit - refer to (G) of Check Point (Base Unit) (P.45) Handset - refer to (H) of Check Point (Handset) (P.49)
  • Page 42 KX-TG7341BX/KX-TGA731BX 9.1.4.3. 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-TG7341BX/KX-TGA731BX 9.1.5. Check Handset Transmission Cross Reference: Signal Route (P.14) 9.1.6. Check Handset Reception Cross Reference: How to Check the Speaker or Receiver (P.68). Signal Route (P.14) 9.1.7. Check Caller ID Cross Reference: Signal Route (P.14)
  • Page 44 KX-TG7341BX/KX-TGA731BX 9.1.8. Bell Reception 9.1.8.1. Base Unit 9.1.8.2. Handset Cross Reference: Telephone Line Interface (P.10) Check Link (P.36) How to Check the Speaker or Receiver (P.68) 9.1.9. Check TAM Operation Cross Reference: Power Supply Circuit (P.9) Note: (*1) When replacing FLASH MEMORY (IC421), TAM data need to be written to it. Refer to Base Unit of Things to Do after Replacing IC or X'tal (P.65)

  • Page 45: Troubleshooting By Symptom (Base Unit And Charger Unit)

    KX-TG7341BX/KX-TGA731BX 9.2. Troubleshooting by Symptom (Base Unit and Charger Unit) If your unit has below symptoms, follow the instructions in remedy column. Remedies depend on whether you have DECT tester (*1) or not. Note: (*1) A general repair is possible even if you don’t have the DECT tester because it is for confirming the levels, such as Acoustic level in detail.
  • Page 46 KX-TG7341BX/KX-TGA731BX Items Check Procedure Check or Point Replace Parts 1. Connect Telephone Socket to Tel-simulator which is connected with 600 Ω. (H)* Hookswitch Check with L1, L2, Q3, R14, DC Characteristics 2. Set line voltage to 48 V and line current to 40mA at off-hook condition of nor- R15, Q4, R16, mal telephone.
  • Page 47 KX-TG7341BX/KX-TGA731BX Items Check Procedure Check or Point Replace Parts (M)* Frequency Drift Confir- Follow steps 1 to 6 of (J). IC7, L104, mation ANTI_TP 7.Confirm that the frequency drift is < ± 20 kHz/ms. C101, C106, C102, C109, R65, R66, DA1, R802~R807, C837, C826, C822, C820,...
  • Page 48 KX-TG7341BX/KX-TGA731BX Items Check Procedure Check or Point Replace Parts (P)* Power RAMP Confirma- Follow steps 1 to 6 of (J). IC7, L104, tion 7.Confirm that Power RAMP is matching. C101, C106, C102, C109, R65, R66, DA1, R802~R807, C837, C826, C822, C820, C832, C833, C63, Q401, C402, C105,...

  • Page 49: Troubleshooting By Symptom (Handset)

    KX-TG7341BX/KX-TGA731BX 9.3. Troubleshooting by Symptom (Handset) If your unit has below symptoms, follow the instructions in remedy column. Remedies depend on whether you have DECT tester (*1) or not. Note: (*1) A general repair is possible even if you don’t have the DECT tester because it is for confirming the levels, such as Acoustic level in detail.
  • Page 50 KX-TG7341BX/KX-TGA731BX Items Check Procedure Check or Point Replace Parts (E) Charge Detection (OFF) 1. Stop supplying 3.5 V to CHG (+) and CHG (-). IC1, Q4 Q9, Check 2. Confirm the indication of “charging” has been cleared. D7, D8, L4, L5, R6, R7, F1, C1, C3, R2, R30, R31, R8,...
  • Page 51 KX-TG7341BX/KX-TGA731BX Items Check Procedure Check or Point Replace Parts (J)* Modulation Check and Follow steps 1 to 3 of (I). IC1, Adjustment 4.Confirm that the B-Field Modulation is -370±30/ +370±30 kHz/div & Modulated C808~C814, width 690 kHz using data type Fig 31. L802~L804, C825, C834, C819, IC801,...
  • Page 52 KX-TG7341BX/KX-TGA731BX Items Check Procedure Check or Point Replace Parts (N)* Power RAMP Confirma- Follow steps 1 to 3 of (I). IC1, tion 4.Confirm that Power RAMP is matching. C808~C814, L802~L804, C825, C834, C819, IC801, R107, R108, C117, C118, C841, C125, C842, DA1, C801~C804, D801,D802,...

  • Page 53: Disassembly And Assembly Instructions

    KX-TG7341BX/KX-TGA731BX 10 Disassembly and Assembly Instructions 10.1. Disassembly Instructions 10.1.1. Base Unit...
  • Page 54 KX-TG7341BX/KX-TGA731BX...
  • Page 55 KX-TG7341BX/KX-TGA731BX 10.1.2. Handset...
  • Page 56 KX-TG7341BX/KX-TGA731BX 10.1.3. Charger Unit...

  • Page 57: How To Replace The Handset Lcd

    KX-TG7341BX/KX-TGA731BX 10.2. How to Replace the Handset LCD...

  • Page 58: Measurements And Adjustments

    KX-TG7341BX/KX-TGA731BX 11 Measurements and Adjustments 11.1. The Setting Method of JIG (Base Unit) 11.1.1. Preparation 11.1.1.1. Equipment Required • DECT tester: Rohde & Schwarz, CMD 60 is recommended. • Frequency counter: It must be precise enough to measure intervals of 1 Hz (precision; ±4 ppm). Hewlett Packard, 53131A is recommended.
  • Page 59 KX-TG7341BX/KX-TGA731BX 11.1.2.2. Batch file Setting Note: • “****” varies depending on the country. 11.1.2.3. Commands See the table below for frequently used commands. Command name Function Example rdeeprom Read the data of EEPROM Type “rdeeprom 00 00 FF”, and the data from address “00 00”...

  • Page 60: Adjustment Standard (Base Unit)

    KX-TG7341BX/KX-TGA731BX 11.2. Adjustment Standard (Base Unit) When connecting the simulator equipments for checking, please refer to below. 11.2.1. Bottom View 6.3 V 47 F CHARGE- CHARGE+ LINE_DC Note: (A) - (S) is referred to Check Point (Base Unit) (P.45)

  • Page 61: Adjustment Standard (Charger Unit)

    KX-TG7341BX/KX-TGA731BX 11.3. Adjustment Standard (Charger Unit) When connecting the simulator equipment for checking, please refer to below. 11.3.1. Bottom View Digital Volt Meter /2 W DC POWER DC 6.5 V Note: (A) is referred to Check Point (Charger Unit) (P.48)

  • Page 62: The Setting Method Of Jig (Handset)

    KX-TG7341BX/KX-TGA731BX 11.4. The Setting Method of JIG (Handset) 11.4.1. Preparation 11.4.1.1. Equipment Required • DECT tester: Rohde & Schwarz, CMD 60 is recommended. • Frequency counter: It must be precise enough to measure intervals of 1 Hz (precision; ±4 ppm). Hewlett Packard, 53131A is recommended.
  • Page 63 KX-TG7341BX/KX-TGA731BX 11.4.2.2. Batch file Setting Note: • “*****” varies depending on the country. 11.4.2.3. Commands See the table below for frequently used commands. Command name Function Example rdeeprom Read the data of EEPROM Type “rdeeprom 00 00 FF”, and the data from address “00 00”...

  • Page 64: Adjustment Standard (Handset)

    KX-TG7341BX/KX-TGA731BX 11.5. Adjustment Standard (Handset) When connecting the simulator equipments for checking, please refer to below. 11.5.1. Component View Note: (A) - (Q) is referred to Check Point (Handset) (P.49)

  • Page 65: Things To Do After Replacing Ic Or X'tal

    KX-TG7341BX/KX-TGA731BX 11.6. Things to Do after Replacing IC or X'tal Cautions: Some of the content on this page may not apply to models from some countries. 11.6.1. Base Unit Before making the following adjustment, ensure you have carried out PC Setting (P.58) in The Setting Method of JIG (Base Unit).
  • Page 66 KX-TG7341BX/KX-TGA731BX 11.6.2. Handset Before making the following adjustment, ensure you have carried out PC Setting (P.62) in The Setting Method of JIG (Hand- set). Items Necessary Adjustment BBIC (FLASH type) Programs for Voice processing, interface for RF 1. Make sure to connect the JIG cable, then detach the DC (IC1) and EEPROM Power.

  • Page 67: Rf Specification

    KX-TG7341BX/KX-TGA731BX 11.7. RF Specification 11.7.1. Base Unit Item Value Refer to -. * TX Power 19 dBm ~ 25 dBm Check Point (Base Unit) (J) Modulation -370±30/+370±30 kHz/div & Modulated Check Point (Base Unit) (K) width 690 kHz Frequency Offset -50 kHz ~ +50 kHz Check Point (Base Unit) (L) Frequency Drift...

  • Page 68: How To Check The Speaker Or Receiver

    KX-TG7341BX/KX-TGA731BX 11.8. How to Check the Speaker or Receiver 1. Prepare the digital voltmeter, and set the selector knob to ohm meter. 2. Put the probes at the speaker (receiver) terminals as shown below. 11.9. Frequency Table (MHz) BASE UNIT HANDSET Channel No Transmit Frequency...

  • Page 69: Miscellaneous

    KX-TG7341BX/KX-TGA731BX 12 Miscellaneous 12.1. CPU Data (Base Unit) 12.1.1. IC7 (BBIC) Pin No. Description Connection at Normal mode at Reset mode VSS_LNA1 RF_RXp RF_RXp RF_RXn RF_RXn VSS_LNA2 RFP1 RXON O_0/1 Hi-Z RFP0 ANT1 O_0/1 Hi-Z REF_RES REF_RES AVS_XTAL XTAL2 XTAL2 XTAL1 XTAL1 AVD_XTAL...
  • Page 70 KX-TG7341BX/KX-TGA731BX Pin No. Description Connection at Normal mode at Reset mode P1_3/INT3/SIO ROW2 I_0/1 I-PD P1_2/INT2/SK ROW3 I_0/1 I-PU P1_1/INT1/LE ROW4 I_0/1 I-PU P2_6/WTF_IN N.C. I_High I-PU P0_7/SPI_DI SPI_DI I_0/1 I-PU P0_6/SPI_DO SPI_DO O_0/1 I-PU P0_5/SPI_CLK SPI_CLK O_0/1 I-PU P0_4/SPI_EN FLASH_CSn O_0/1 I-PU...

  • Page 71: Cpu Data (Handset)

    KX-TG7341BX/KX-TGA731BX 12.2. CPU Data (Handset) 12.2.1. IC1 (BBIC) Pin No. Description Connection at Normal mode at Reset mode VSS_LNA1 RF_RXp RF_RXp RF_RXn RF_RXn VSS_LNA2 RFP1 RXON O_0/1 Hi-Z RFP0 ANT1 O_0/1 Hi-Z REF_RES REF_RES AVS_XTAL XTAL2 XTAL2 XTAL1 XTAL1 AVD_XTAL AVD_XTAL RF_SUPPLY1 RF_SUPPLY1...
  • Page 72 KX-TG7341BX/KX-TGA731BX Pin No. Description Connection at Normal mode at Reset mode JTAG D.I/O JTAG I/O_0/1 I-PU P2_5/PCM_FSC/SF LCD_CSB O_0/1 I-PU P2_4/SCL1/PCM_DO/ N.C. I-PU P2_3/SDA1/PCM_DI/DP2 N.C. I-PU P2_2/PCM_CLK/CLK100 LCD_RESET O_0/1 I-PU P2_1/ECZ2/PWM1/LED4 N.C. P2_0/ECZ1/PWM0/LED3 BELL_LED_A VDD2 +1.8V LDORF_CTRL N.C. RF_SUPPLY2 RF_SUPPLY2 RF0n ANT2 O_0/1...

  • Page 73: How To Replace The Flat Package

    KX-TG7341BX/KX-TGA731BX 12.3. 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. 12.3.1.
  • Page 74 KX-TG7341BX/KX-TGA731BX 12.3.3. 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. 3.

  • Page 75: How To Replace The Llp

    KX-TG7341BX/KX-TGA731BX 12.4. How to Replace the LLP (Leadless Leadframe Package) IC 12.4.1. 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. An expert may be able to use a 60 to 80 Watt iron where someone with less experience could overheat and damage the PCB foil.
  • Page 76 KX-TG7341BX/KX-TGA731BX 12.4.4. 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. 2. Place the solder a little on the land where IC pins are to be attached, then place the IC. Note: •...

  • Page 77: Terminal Guide Of The Ics, Transistors And Diodes

    KX-TG7341BX/KX-TGA731BX 12.5. Terminal Guide of the ICs, Transistors and Diodes 12.5.1. Base Unit 12.5.2. Handset 12.5.3. Charger Unit...

  • Page 78: Schematic Diagram

    KX-TG7341BX/KX-TGA731BX 13 Schematic Diagram 13.1. For Schematic Diagram 13.1.1. Base Unit (Schematic Diagram (Base Unit_Main)) Notes: 1. DC voltage measurements are taken with voltmeter from the negative voltage line. 2. The schematic diagrams may be modified at any time with the development of new technology. 13.1.2.
  • Page 79 KX-TG7341BX/KX-TGA731BX Memo...

  • Page 80: Schematic Diagram (Base Unit_Main)

    KX-TG7341BX/KX-TGA731BX 13.2. Schematic Diagram (Base Unit_Main) ANT2_TP ANT1_TP ANT_1 ANT_2 Low_Rad +3.0V ANT1 ANT2 Pow_Adj Pow_Adj Low_Rad *Q101 L104 TX_RF RX_RF C425 3.0V VDD4 CP_OUT1=3.0V TAM_WP *R425 270k 100n TAM_WP *C422 *Q421 100n CHARGE VD D *C424 ROW0 *HOLD ROW1 SPI_CLK ROW2 (10)
  • Page 81 KX-TG7341BX/KX-TGA731BX LINE_DC Loop Current 100k 6.8k TP10 2.2k 100k 3.9k +1.8V 5.6M +1.8V 100k GND GND TX_AF RX_AF Caller ID, 5.6M Bell Signal K1000p 180k 1.5n K1000p 180k 1.5n Bell signal Charge Current +2.5_CP VDD5 220p C403 2.5V DC_IN 100k J101 100k 3.0V...

  • Page 82: Schematic Diagram (Base Unit_Rf Part)

    KX-TG7341BX/KX-TGA731BX 13.3. Schematic Diagram (Base Unit_RF Part)

  • Page 83: Schematic Diagram (Base Unit_Operation)

    KX-TG7341BX/KX-TGA731BX 13.4. Schematic Diagram (Base Unit_Operation) KEY5 KEY4 KEY3 KEY2 KEY1 KEY0 NEWMSG2 STOP NEWMSG ERASE ROW4 CN1-5 CN1-6 CN1-7 AUTO SP-PHONE MUTE CN1-8 ROW3 CN1-9 CN1-10 CN2-2 CN2-3 CN2-4 GREETING REDIAL CN2-5 ROW2 CN2-6 SKIP DOWN IN USE_LED LED1 CN1-1 ROW1 SP-PHONE_LED...

  • Page 84: Schematic Diagram (Handset)

    KX-TG7341BX/KX-TGA731BX 13.5. Schematic Diagram (Handset) Charge Current BATTERY 5.6n BATT+ DD+4.0V BATTERY RG+3.1V +3.0V IC20 IC11 IC10 IC13 BATT- 3.1V REG VOUT VOUT VOUT FET/DIODE ON/*OFF DCDC_REG_CS C149 X_CLK 2.5V 4.0V CP+2.5V CP+4.0V 3.9k CHG(+) CHARGE POWER Terminal k0.1u +1.8V CHG(-) GND_0 K0.1u...
  • Page 85 KX-TG7341BX/KX-TGA731BX ANT_TP R107 R108 R807 ANT1 ANT2 RXON C822 100p C826 RX_RF 1.5p (MAX500mA) +1.8V 1.8V 1.8V RF_RXn C832 RF_RXp C833 C803 C801 1.3p C804 C802 2.4p 2.4p CP+2.5V RG+3.1V +1.8V C172 0.1u R806 TXON C825 BATTERY R805 VDD_PADRV C812 C808 C819 100n...

  • Page 86: Schematic Diagram (Charger Unit)

    KX-TG7341BX/KX-TGA731BX 13.6. Schematic Diagram (Charger Unit) R1 10 SCHEMATIC DIAGRAM (Charger Unit)

  • Page 87: Printed Circuit Board

    KX-TG7341BX/KX-TGA731BX 14 Printed Circuit Board 14.1. Circuit Board (Base Unit_Main) 14.1.1. Component View ANT_1 C104 C101 C102 L104 C111 C826 C803 R32 R36 C820 D802 R12 R13 C801 C812 C833 C825 D801 L804 R805 L803 C809 C805 C819 C810 IC801 Q101 R103 Q401...
  • Page 88 KX-TG7341BX/KX-TGA731BX 14.1.2. Bottom View KX-TG7341H TG7331H ANT2_TP YELLOW GREEN WHITE J101 ANT1 ANT2 VDD3 GND_C GND_C LINE_DC TP10 LINE_DC VDD1 VDD1 (1.8 V) Low_Rad TG7331_short VDD2 SPI_DO VDD2 (2.4 V) TAM_WP SPI_CLK FLASH_CSn UVCC (3.0 V) JTAG IC421 EEP_WP Q421 SPI_DI TP16_sub RA401...

  • Page 89: Circuit Board (Base Unit_Operation)

    KX-TG7341BX/KX-TGA731BX 14.2. Circuit Board (Base Unit_Operation) 14.2.1. Component View KX-TG7341H TG7331H LED4 LED3 ERASE SKIP DOWN PNLB1038Z PROGRAM MUTE LED1 RECALL LED2 SP-PHONE KX-TG7341 CIRCUIT BOARD (Base Unit_Operation (Component View))
  • Page 90 KX-TG7341BX/KX-TGA731BX 14.2.2. Bottom View KX-TG7341H TG7331H PNLB1038Z PNWH01 PNWH02 KX-TG7341 CIRCUIT BOARD (Base Unit_Operation (Bottom View))

  • Page 91: Circuit Board (Handset)

    KX-TG7341BX/KX-TGA731BX 14.3. Circuit Board (Handset) 14.3.1. Component View PQUP11548Y KX-TGA730/731 C811 ANT_TP C807 C814 C804 C813 R803 C802 L802 C808 R805 C837 C834 JTAG C832 R807 R203 R235 X_CLK C101 R152 R157 POWER 1.8V IC13 R255 R256 R271 CP 4.0V R250 R247 R249...
  • Page 92 KX-TG7341BX/KX-TGA731BX 14.3.2. Bottom View C138 C70 C71 R801 R108 R107 SOFT_A SOFT_B SOFT_C TALK LEFT RIGHT LED8 LED6 CANCEL DOWN KX-TGA731 CIRCUIT BOARD (Handset (Bottom View))

  • Page 93: Circuit Board (Charger Unit)

    KX-TG7341BX/KX-TGA731BX 14.4. Circuit Board (Charger Unit) 14.4.1. Component View CIRCUIT BOARD (Charger unit (Component View)) 14.4.2. Bottom View TP4 (GND) CIRCUIT BOARD (Charger unit (Bottom View))

  • Page 94: Exploded View And Replacement Parts List

    KX-TG7341BX/KX-TGA731BX 15 Exploded View and Replacement Parts List 15.1. Cabinet and Electrical Parts (Base Unit)

  • Page 95: Cabinet And Electrical Parts (Handset)

    (*1) This cable is fixed by welding. Refer to How to Replace the Handset LCD (P.57). (*2) The rechargeable Ni-MH battery HHR-4MPT is available through sales route of Panasonic. (*3) Attach the spacer (No. 123) to the exact location described above.

  • Page 96: Cabinet And Electrical Parts (Charger Unit)

    KX-TG7341BX/KX-TGA731BX 15.3. Cabinet and Electrical Parts (Charger Unit)

  • Page 97: Accessories And Packing Materials

    KX-TG7341BX/KX-TGA731BX 15.4. Accessories and Packing Materials 15.4.1. KX-TG7341BXM/BXT...
  • Page 98 KX-TG7341BX/KX-TGA731BX 15.4.2. KX-TGA731BXB/BXF/BXS...

  • Page 99: Replacement Part List

    15.5. Replacement Part List Safety Ref. Part No. Part Name & Description Remarks 1. RTL (Retention Time Limited) PNBC1002Y6 BUTTON, NAVIGATOR ABS-HB (for KX-TG7341BXM) Note: PNBC1002Y5 BUTTON, NAVIGATOR ABS-HB The “RTL” marking indicates that its Retention Time is (for KX-TG7341BXT) Limited. PNHR1001Z...
  • Page 100 KX-TG7341BX/KX-TGA731BX Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks D802 MA27P1200L DIODE(SI) ERJ2GEJ103 B0DDCL000001 DIODE(SI) ERJ2GEJ103 (COILS) R202 ERJ3GEYJ102 PQLQXF330K COIL R203 ERJ2GEJ104 100k PQLQXF330K COIL R204 ERJ2GE0R00 L104 PQLQR4C15NJ COIL R205 ERJ2GEJ331...
  • Page 101 KX-TG7341BX/KX-TGA731BX Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks ECUE1H100DCQ 10p PNWHK10SH05C LEAD WIRE, PARALLEL WIRE ECUE1A104KBQ 0.1 K5H302Y00003 FUSE ECUE1H100DCQ 10p H0J103500032 CRYSTAL OSCILLATOR (*1) ECUE0J105KBQ 1 15.5.1.3. Operational P.C.Board Parts ECUE1H100DCQ 10p ECUE1A104KBQ 0.1 F1G1H3R0A480 3p...
  • Page 102 KX-TG7341BX/KX-TGA731BX Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks PNGT1681S NAME PLATE (for L803 G1C4N7Z00006 COIL TGA731BXM) L804 G1C4N7Z00006 COIL PNGT1681T NAME PLATE (for PQLQR2M5N6K COIL TGA731BXT) (COMPONENTS PARTS) PNGT1681Z NAME PLATE (for...
  • Page 103 KX-TG7341BX/KX-TGA731BX Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks R806 ERJ2GEJ221 C842 ECUE1H101JCQ 100p R807 ERJ2GEJ221 (OTHERS) ERJ2GEJ330 MIC100 L0CBAY000016 MICROPHONE ERJ2GEJ330 E101 L5DZBYY00013 LIQUID CRYSTAL DISPLAY (*3) (CAPACITORS) E102 PQHX11378Z COVER, LCD COVER SHEET F2A0J1010090 100...
  • Page 104 KX-TG7341BX/KX-TGA731BX 15.5.4.1. KX-TG7341BXM/BXT Safety Ref. Part No. Part Name & Description Remarks PQLV207BXU AC ADAPTOR PQJA10075Z CORD, TELEPHONE PNQX1230Z INSTRUCTION BOOK (*1) PNQW1175Z LEAFLET, QUICK GUIDE (for Arabic) PNQW1176Z LEAFLET, QUICK GUIDE (for Persian) PQPP10152Z PROTECTION COVER (for Base Unit)

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