Panasonic KX-TG7331 Service Manual
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Panasonic KX-TG7331 Service Manual

Panasonic KX-TG7331 Service Manual

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Telephone Equipment
KX-TG7331BXM
Model No.
KX-TG7331BXT
KX-TGA731BXM
KX-TGA731BXT
KX-TGA731BXB
KX-TGA731BXF
KX-TGA731BXS
Digital Cordless Phone
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. KM40809711CE

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Summary of Contents for Panasonic KX-TG7331

  • Page 1 Digital Cordless Phone 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-TG7331BX//KX-TGA731BX...

  • Page 3: Table Of Contents

    KX-TG7331BX//KX-TGA731BX TABLE OF CONTENTS PAGE PAGE 1 Safety Precautions----------------------------------------------- 4 13.1. For Schematic Diagram -------------------------------- 77 1.1. For Service Technicians --------------------------------- 4 13.2. Schematic Diagram (Base Unit_Main)-------------- 78 2 Warning -------------------------------------------------------------- 4 13.3. Schematic Diagram (Base Unit_RF Part)---------- 80 2.1. Battery Caution--------------------------------------------- 4 13.4.

  • Page 4: Safety Precautions

    KX-TG7331BX//KX-TGA731BX 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 pre- vent fires, injury or electric shock, which can be caused by improper repair work. 1.

  • Page 5: Discarding Of P.c. Board

    KX-TG7331BX//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-TG7331BX//KX-TGA731BX 3 Specifications Note: • Design and 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-TG7331BX//KX-TGA731BX 4 Technical Descriptions 4.1. Block Diagram (Base Unit)

  • Page 8: Circuit Operation (Base Unit)

    KX-TG7331BX//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-TG7331BX//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-TG7331BX//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-TG7331BX//KX-TGA731BX 4.3. Block Diagram (Handset)

  • Page 12: Circuit Operation (Handset)

    KX-TG7331BX//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-TG7331BX//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-TG7331BX//KX-TGA731BX 4.6. Signal Route...

  • Page 15: Location Of Controls And Components

    KX-TG7331BX//KX-TGA731BX 5 Location of Controls and 5.1.2. Handset Components 5.1. Controls 5.1.1. Base Unit...

  • Page 16: Installation Instructions

    KX-TG7331BX//KX-TGA731BX 6 Installation Instructions 6.1. Connections...

  • Page 17: 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.24)

  • Page 18: Operating Instructions

    KX-TG7331BX//KX-TGA731BX 7 Operating Instructions 7.1. Programmable Settings...

  • Page 19: Registering A Handset To The Base Unit

    KX-TG7331BX//KX-TGA731BX *1 The item will not be reset when pressing key of the handset. Refer to How to Clear User Setting (P.31). *2 The item will not be reset when pressing keys. Refer to How to Clear User Setting (P.31). *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: Copying Phonebook Entries

    KX-TG7331BX//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...

  • Page 21: Error Messages

    KX-TG7331BX//KX-TGA731BX 7.5. Error Messages...

  • Page 22: Troubleshooting

    KX-TG7331BX//KX-TGA731BX 7.6. Troubleshooting Cross Reference: For Service Hint (P.24)
  • Page 23 KX-TG7331BX//KX-TGA731BX...

  • Page 24: For Service Hint

    KX-TG7331BX//KX-TGA731BX 7.7. For Service Hint Cross Reference: Battery Charge (P.17)

  • Page 25: Service Mode

    KX-TG7331BX//KX-TGA731BX 8 Service Mode 8.1. Engineering Mode 8.1.1. Base Unit...
  • Page 26 KX-TG7331BX//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 27 KX-TG7331BX//KX-TGA731BX 8.1.2. Handset...
  • Page 28 KX-TG7331BX//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 29: Copying Phonebook Items When Repairing

    KX-TG7331BX//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 30 KX-TG7331BX//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.19) •...

  • Page 31: How To Clear User Setting

    KX-TG7331BX//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.18). •...

  • Page 32: Troubleshooting Guide

    KX-TG7331BX//KX-TGA731BX 9 Troubleshooting Guide 9.1. Troubleshooting Flowchart Flow Chart Cross Reference: Check Power (P.33) Bell Reception (P.43) Check Battery Charge (P.34) Check Link (P.35) Check the RF part (P.39) Check Handset Transmission (P.42) Check Handset Reception (P.42) Signal Route (P.14) Check Caller ID (P.42)
  • Page 33 KX-TG7331BX//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...
  • Page 34 KX-TG7331BX//KX-TGA731BX Cross Reference: Power Supply Circuit/Reset Circuit (P.12) 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.33) Charge Circuit (P.12) 9.1.2.3. Charger Unit Cross Reference: Charge Circuit (P.12)
  • Page 35 KX-TG7331BX//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.44) Cross Reference: Check Point (Base Unit) (P.44) Power Supply Circuit (P.9)
  • Page 36 KX-TG7331BX//KX-TGA731BX Cross Reference: Check Point (Base Unit) (P.44)
  • Page 37 KX-TG7331BX//KX-TGA731BX 9.1.3.2. Handset Note: (*1) Refer to Troubleshooting by Symptom (Handset) (P.48) Cross Reference: Check Point (Handset) (P.48) Power Supply Circuit/Reset Circuit (P.12)
  • Page 38 KX-TG7331BX//KX-TGA731BX Cross Reference: Check Point (Handset) (P.48)
  • Page 39 KX-TG7331BX//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.19)
  • Page 40 KX-TG7331BX//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.41). Please refer to the each item. Note: (*1) Base unit - refer to (G) of Check Point (Base Unit) (P.44) Handset - refer to (H) of Check Point (Handset) (P.48)
  • Page 41 KX-TG7331BX//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 42 KX-TG7331BX//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.67). Signal Route (P.14) 9.1.7. Check Caller ID Cross Reference: Signal Route (P.14)
  • Page 43 KX-TG7331BX//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.35) How to Check the Speaker or Receiver (P.67)

  • Page 44: Troubleshooting By Symptom (Base Unit And Charger Unit)

    KX-TG7331BX//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 45 KX-TG7331BX//KX-TGA731BX Items Check Procedure Check or Point Replace Parts (H)* Hookswitch Check with 1. Connect Telephone Socket to Tel-simulator which is connected with 600 Ω. 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 46 KX-TG7331BX//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 47 KX-TG7331BX//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 48: Troubleshooting By Symptom (Handset)

    KX-TG7331BX//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 49 KX-TG7331BX//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 50 KX-TG7331BX//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 51 KX-TG7331BX//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 52: Disassembly And Assembly Instructions

    KX-TG7331BX//KX-TGA731BX 10 Disassembly and Assembly Instructions 10.1. Disassembly Instructions 10.1.1. Base Unit...
  • Page 53 KX-TG7331BX//KX-TGA731BX...
  • Page 54 KX-TG7331BX//KX-TGA731BX 10.1.2. Handset...
  • Page 55 KX-TG7331BX//KX-TGA731BX 10.1.3. Charger Unit...

  • Page 56: How To Replace The Handset Lcd

    KX-TG7331BX//KX-TGA731BX 10.2. How to Replace the Handset LCD...

  • Page 57: Measurements And Adjustments

    KX-TG7331BX//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 58 KX-TG7331BX//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 59: Adjustment Standard (Base Unit)

    KX-TG7331BX//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) - (R) is referred to Check Point (Base Unit) (P.44)

  • Page 60: Adjustment Standard (Charger Unit)

    KX-TG7331BX//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.47)

  • Page 61: The Setting Method Of Jig (Handset)

    KX-TG7331BX//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 62 KX-TG7331BX//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 63: Adjustment Standard (Handset)

    KX-TG7331BX//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.48)

  • Page 64: Things To Do After Replacing Ic Or X'tal

    KX-TG7331BX//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.57) in The Setting Method of JIG (Base Unit).
  • Page 65 KX-TG7331BX//KX-TGA731BX 11.6.2. Handset Before making the following adjustment, ensure you have carried out PC Setting (P.61) 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 66: Rf Specification

    KX-TG7331BX//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 67: How To Check The Speaker Or Receiver

    KX-TG7331BX//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 68: Miscellaneous

    KX-TG7331BX//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 69 KX-TG7331BX//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 N.C. I_0/1 I-PU P2_6/WTF_IN I-PU P0_7/SPI_DI N.C. I_0/1 I-PU P0_6/SPI_DO N.C. O_0/1 I-PU P0_5/SPI_CLK N.C. O_0/1 I-PU P0_4/SPI_EN N.C. O_0/1 I-PU P0_3/SCL2 SCL2...

  • Page 70: Cpu Data (Handset)

    KX-TG7331BX//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 71 KX-TG7331BX//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 72: How To Replace The Flat Package

    KX-TG7331BX//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 73 KX-TG7331BX//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 74: How To Replace The Llp

    KX-TG7331BX//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 75 KX-TG7331BX//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 76: Terminal Guide Of The Ics, Transistors And Diodes

    KX-TG7331BX//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 77: Schematic Diagram

    KX-TG7331BX//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 78: Schematic Diagram (Base Unit_Main)

    KX-TG7331BX//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 100n *C422 TAM_WP *Q421 CHARGE VD D *C424 ROW0 *HOLD ROW1 SPI_CLK ROW2 (10) SPI_DO ROW3...
  • Page 79 KX-TG7331BX//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 80: Schematic Diagram (Base Unit_Rf Part)

    KX-TG7331BX//KX-TGA731BX 13.3. Schematic Diagram (Base Unit_RF Part)

  • Page 81: Schematic Diagram (Base Unit_Operation)

    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 LED2 CN1-2 PAUSE RECALL NC (ANSWER_LED) *LED3 CN1-3 ROW0 NC (NEW-MSG_LED) *LED4 CN1-4 CN2-1 NC: No Components KX-TG7331 SCHEMATIC DIAGRAM (Base Unit_Operation)

  • Page 82: Schematic Diagram (Handset)

    KX-TG7331BX//KX-TGA731BX 13.5. Schematic Diagram (Handset) Charge Current BATTERY 5.6n BATT+ DD+4.0V BATTERY RG+3.1V +3.0V IC20 IC10 IC11 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 83 KX-TG7331BX//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 84: Schematic Diagram (Charger Unit)

    KX-TG7331BX//KX-TGA731BX 13.6. Schematic Diagram (Charger Unit) R1 10 SCHEMATIC DIAGRAM (Charger Unit)

  • Page 85: Printed Circuit Board

    D801 L804 R805 L803 C809 C805 C819 C810 IC801 Q101 R103 Q401 R801 C402 C404 CHARGE R208 TP16 R204 C203 IC201 C211 R209 C216 TP15 R206 R207 RA501 RA502 PNWH01 KX-TG7341/31H PNWH02 PNLB1037Z KX-TG7331 CIRCUIT BOARD (Base Unit_Main (Component View))
  • Page 86 (3.0 V) UVCC JTAG IC421 EEP_WP Q421 SPI_DI TP16_sub RA401 SCL2 CHARGE+ CHG+ UVCC SDA2 VDD4 VDD4 TAM_EM SPI2_CLK IC401 (CP3.0V) SPI2_DI MIC+ SPI2_DO VDD5 MIC- CHARGE- CHG- (10.368 MHz) PNLB1037Z TP15_sub VDD5 (CP2.5V) KX-TG7331 CIRCUIT BOARD (Base Unit_Main (Bottom View))

  • Page 87: Circuit Board (Base Unit_Operation)

    KX-TG7331BX//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-TG7331 CIRCUIT BOARD (Base Unit_Operation (Component View))
  • Page 88 KX-TG7331BX//KX-TGA731BX 14.2.2. Bottom View KX-TG7341H TG7331H PNLB1038Z PNWH01 PNWH02 KX-TG7331 CIRCUIT BOARD (Base Unit_Operation (Bottom View))

  • Page 89: Circuit Board (Handset)

    KX-TG7331BX//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 90 KX-TG7331BX//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 91: Circuit Board (Charger Unit)

    KX-TG7331BX//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 92: Exploded View And Replacement Parts List

    KX-TG7331BX//KX-TGA731BX 15 Exploded View and Replacement Parts List 15.1. Cabinet and Electrical Parts (Base Unit)

  • Page 93: Cabinet And Electrical Parts (Handset)

    (*1) This cable is fixed by welding. Refer to How to Replace the Handset LCD (P.56). (*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 94: Cabinet And Electrical Parts (Charger Unit)

    KX-TG7331BX//KX-TGA731BX 15.3. Cabinet and Electrical Parts (Charger Unit)

  • Page 95: Accessories And Packing Materials

    KX-TG7331BX//KX-TGA731BX 15.4. Accessories and Packing Materials 15.4.1. KX-TG7331BXM/BXT...
  • Page 96 KX-TG7331BX//KX-TGA731BX 15.4.2. KX-TGA731BXB/BXF/BXS...

  • Page 97: Replacement Part List

    KX-TG7331BX//KX-TGA731BX 15.5. Replacement Part List Safety Ref. Part No. Part Name & Description Remarks 1. RTL (Retention Time Limited) PNBC1242Z2 BUTTON, (for ABS-HB KX-TG7331BXM) Note: PNBC1242Z1 BUTTON, (for ABS-HB The “RTL” marking indicates that its Retention Time is KX-TG7331BXT) Limited. PNJK1026Y KEYBOARD SWITCH...
  • Page 98 KX-TG7331BX//KX-TGA731BX Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks L802 G1C2N7Z00009 COIL R208 ERJ2GEJ222 2.2k L803 G1C4N7Z00006 COIL R209 ERJ2GEJ222 2.2k L804 G1C3N3Z00007 COIL R210 ERJ2GEJ105X L805 G1C1N0Z00002 COIL R301 ERJ3GEYJ221 (COMPONENTS PARTS) R302...
  • Page 99 KX-TG7331BX//KX-TGA731BX 15.5.2. Handset Safety Ref. Part No. Part Name & Description Remarks 15.5.2.1. Cabinet and Electrical Parts C204 ECUE1A104KBQ 0.1 C205 ECUE1A104KBQ 0.1 C206 ECUE1H102KBQ 0.001 C207 ECUE1A104KBQ 0.1 Safety Ref. Part No. Part Name & Description Remarks C208 ECUE1A104KBQ 0.1 C209 ECUE1H100DCQ 10p PNGP1001Z8...
  • Page 100 KX-TG7331BX//KX-TGA731BX 15.5.2.2. Main P.C.Board Parts Safety Ref. Part No. Part Name & Description Remarks Note: ERJ2GE0R00 (*1) Reconfirm the model No. written on the handset’s name ERJ2GE0R00 plate when replacing PCB100. Because the model No. of ERJ2GEJ102 the optional handset may differ from the included handset. ERJ2GE0R00 (*2) When replacing IC1, IC3 or X1, make the adjustment ERJ2GE0R00...
  • Page 101 KX-TG7331BX//KX-TGA731BX 15.5.3. Charger Unit Safety Ref. Part No. Part Name & Description Remarks 15.5.3.1. Cabinet and Electrical Parts ECUV1A105KBV 1 ECUV1A105KBV 1 ECUV1A105KBV 1 PQCUV0J106KB 10 Safety Ref. Part No. Part Name & Description Remarks PQCUV0J106KB 10 ECUE1H100DCQ 10p PNLC1001ZB CHARGER UNIT ASS'Y ECUE1H100DCQ 10p without NAME PLATE...
  • Page 102 KX-TG7331BX//KX-TGA731BX Safety Ref. Part No. Part Name & Description Remarks PNPK1595Z GIFT BOX 15.5.4.2. KX-TGA731BXB/BXF/BXS Safety Ref. Part No. Part Name & Description Remarks A101 PQLV209BXU AC ADAPTOR A102 PNQX1170Z INSTRUCTION BOOK (for English) (*1) A103 PNQX1171Z INSTRUCTION BOOK (for Arabic) (*1) A104 PNQX1172Z...

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