Panasonic KX-TG234SK Service Manual
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Panasonic KX-TG234SK Service Manual

Digital cordless answering system
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KX-TGA470B
(Handset)
(Charger Unit)
Configuration for each model
Model No
Base Unit
Handset
KX-TG234
1 (TG4741) 4 (TGA470)
KX-TGA470*
1 (TGA470)
*KX-TGA470 is also an optional accessory, which contains a
handset and a charger.
KX-TG4741B
(Base Unit)
Charger Unit Expandable
3
Up to 6
1
Telephone Equipment
KX-TG234SK
Model No.
KX-TGA470B
Digital Cordless Answering System
B: Black Version
(for U.S.A.)
© Panasonic System Networks Co., Ltd. 2012
Unauthorized copying and distribution is a violation
of law.
ORDER NO. KM41202541CE
F13

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Summary of Contents for Panasonic KX-TG234SK

  • Page 1 KX-TG234 1 (TG4741) 4 (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-TG234SK/KX-TGA470B 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-TG234SK/KX-TGA470B TABLE OF CONTENTS PAGE PAGE 1 Safety Precautions----------------------------------------------- 4 16.1. Cabinet and Electrical Parts (Base Unit) ----------- 85 1.1. For Service Technicians --------------------------------- 4 16.2. Cabinet and Electrical Parts (Handset)------------- 86 2 Warning -------------------------------------------------------------- 4 16.3. Cabinet and Electrical Parts (Charger Unit) ------- 87 2.1.

  • Page 4: Safety Precautions

    KX-TG234SK/KX-TGA470B 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: About Lead Free Solder (Pbf: Pb Free)

    KX-TG234SK/KX-TGA470B 2.2. 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 6: Specifications

    KX-TG234SK/KX-TGA470B 3 Specifications ■ ■ Standard: Bit rate: DECT 6.0 (Digital Enhanced Cordless 1,152 kbit/s ■ Telecommunications 6.0) Modulation: ■ Number of channels: GFSK (Gaussian Frequency Shift Keying) 60 Duplex Channels ■ RF transmission power: ■ Frequency range: 115 mW (max.) 1.92 GHz to 1.93 GHz...

  • Page 7: Technical Descriptions

    KX-TG234SK/KX-TGA470B 4 Technical Descriptions 4.1. 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.60). 4.1.1. TDD Frame Format 5 ms 5 ms Up Link ( Handset - >...
  • Page 8 KX-TG234SK/KX-TGA470B 4.1.3. 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 9: Block Diagram (Base Unit_Main)

    KX-TG234SK/KX-TGA470B 4.2. Block Diagram (Base Unit_Main)

  • Page 10: Block Diagram (Base Unit_Rf Part)

    KX-TG234SK/KX-TGA470B 4.3. Block Diagram (Base Unit_RF Part) ANT2 ANT2 ANT1 DA801 TXON RXON ANT1 KX-TG234 BLOCK DIAGRAM (Base Unit_RF Part)

  • Page 11: Circuit Operation (Base Unit)

    KX-TG234SK/KX-TGA470B 4.4. 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 12 KX-TG234SK/KX-TGA470B 4.4.4. 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: +3.0V VBAT IC601...

  • Page 13: Charge Circuit

    KX-TG234SK/KX-TGA470B 4.4.4.1. Charge Circuit The voltage from the AC adaptor is supplied to the charge circuits. +5.5V F301 CHARGE+ CHARGE-...
  • Page 14 KX-TG234SK/KX-TGA470B 4.4.5. Telephone Line Interface Telephone Line Interface Circuit: Function • Bell signal detection • ON/OFF hook and pulse dial circuit • Side tone circuit Bell 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: T →...
  • Page 15 KX-TG234SK/KX-TGA470B 4.4.6. 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 16 KX-TG234SK/KX-TGA470B 4.4.7. 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 17 KX-TG234SK/KX-TGA470B 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 18: Block Diagram (Handset)

    KX-TG234SK/KX-TGA470B 4.5. 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 19: Block Diagram (Handset_Rf Part)

    KX-TG234SK/KX-TGA470B 4.6. Block Diagram (Handset_RF Part) TXON DA801 RXON KX-TGA470 BLOCK DIAGRAM (Handset_RF Part)

  • Page 20: Circuit Operation (Handset)

    KX-TG234SK/KX-TGA470B 4.7. Circuit Operation (Handset) 4.7.1. Outline Handset consists of the following ICs as shown in Block Diagram (Handset) (P.18). • 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 21: Circuit Operation (Charger Unit)

    KX-TG234SK/KX-TGA470B 4.7.3. 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 22: Signal Route

    KX-TG234SK/KX-TGA470B 4.9. 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(46/47 - 28) - C184 - Q161 - Q141 - D101 - L101/[L102 - P101] - T/R(TEL LINE)
  • Page 23 KX-TG234SK/KX-TGA470B RF part signal route SIGNAL ROUTE ROUTE HANDSET RF IC1(44/45) - L809 - C812 - DA801 - C803 - C801 - ANT [ TX_ROUTE ] HANDSET RF ANT - C801 - C803 - DA801 - C826 - IC1(46/47) [ RX_ROUTE ]...

  • Page 24: Location Of Controls And Components

    KX-TG234SK/KX-TGA470B 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 25: Test Mode

    KX-TG234SK/KX-TGA470B 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 26 KX-TG234SK/KX-TGA470B Frequently Used Items (Base Unit) ex.) Items Address Default Data New Data Remarks Frequency 00 07 / 00 08 00/01 Use these items in a READ-ONLY mode to confirm the contents. Careless rewriting may 00 02 ~ 00 06 Given value cause serious damage to the computer system.
  • Page 27 KX-TG234SK/KX-TGA470B 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 28 KX-TG234SK/KX-TGA470B 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 29: Service Mode

    KX-TG234SK/KX-TGA470B 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 30: Troubleshooting Guide

    KX-TG234SK/KX-TGA470B 10 Troubleshooting Guide 10.1. Troubleshooting Flowchart FLOW CHART Not working Power ON Base Unit Check Power Not playback Playback Pre-Message Check Playback Not record (*1) Record Check Record Link No link No charge Battery Charge Check Battery Charge Check Link...

  • Page 31: Check Power

    KX-TG234SK/KX-TGA470B 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 VDDC (1.2 V): Test Point [VDDC] RSTN: Reset = "High"? Check Reset Circuit.

  • Page 32: Check Record

    KX-TG234SK/KX-TGA470B 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 16 of BBIC. Check ICM Recording in Signal Route.
  • Page 33 KX-TG234SK/KX-TGA470B <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 34 KX-TG234SK/KX-TGA470B 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 35: Check Playback

    KX-TG234SK/KX-TGA470B 10.1.3. Check Playback 10.1.3.1. Base Unit Check VDDC (1.2 V): Test Point [VDDC] Check Power Supply Circuit. Check output of BBIC (Pin 29, 31). Check BBIC and Flash Memory. Check Speaker and its surroundings. Cross Reference: Note: Power Supply Circuit/Reset Circuit (P.12) Flash Memory is IC601.

  • Page 36: Check Link

    KX-TG234SK/KX-TGA470B 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 VBAT about 3.0 V? Check around Power Supply Circuit. Is the voltage of VDDC about 1.2 V? Adjust +3.0V voltage to 3.0 V.
  • Page 37 KX-TG234SK/KX-TGA470B 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 1.2 V? Is the voltage of TP 3.0 V about 3.0 V?

  • Page 38: Check The Rf Part

    KX-TG234SK/KX-TGA470B 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 39 KX-TG234SK/KX-TGA470B 10.1.6.2. RF Check Flowchart Each item (1 ~ 5) of RF Check Flowchart corresponds to Check Table for RF part (P.40). 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 40 KX-TG234SK/KX-TGA470B 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 41 KX-TG234SK/KX-TGA470B 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 42: Registering A Handset To The Base Unit

    KX-TG234SK/KX-TGA470B 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 43: Check Handset Transmission

    KX-TG234SK/KX-TGA470B 10.1.9. Check Handset Transmission Check MIC of handset. Check handset Tx in Signal Route. Cross Reference: Signal Route (P.22) 10.1.10. Check Handset Reception Check speaker of handset. Check handset Rx in Signal Route. Cross Reference: Signal Route (P.22) Note: When checking the RF part, Refer to Check the RF part (P.38).

  • Page 44: Disassembly And Assembly Instructions

    KX-TG234SK/KX-TGA470B 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 pararell wire to remove the main P.C. board.
  • Page 45 KX-TG234SK/KX-TGA470B Remove the 2 screws to remove the Jack holder. Remove the 4 screws to remove the operational P.C.B board.
  • Page 46 KX-TG234SK/KX-TGA470B 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 47: Charger Unit

    KX-TG234SK/KX-TGA470B 11.1.3. Charger Unit 2 charge terminals...

  • Page 48: How To Replace The Base Unit Lcd

    KX-TG234SK/KX-TGA470B 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 49 KX-TG234SK/KX-TGA470B Attach the LCD and fix by hook A (two points).

  • Page 50: How To Replace The Handset Lcd

    KX-TG234SK/KX-TGA470B 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 51: Measurements And Adjustments

    KX-TG234SK/KX-TGA470B 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.30) 12.1. Equipment Required • Digital multi-meter (DMM): it must be able to measure voltage and current.
  • Page 52 KX-TG234SK/KX-TGA470B 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 53 KX-TG234SK/KX-TGA470B 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 54 KX-TG234SK/KX-TGA470B 12.2.4. Commands (Base Unit) 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” to “FF” is read out.

  • Page 55: Adjustment Standard (Base Unit)

    KX-TG234SK/KX-TGA470B 12.3. Adjustment Standard (Base Unit) When connecting the simulator equipment for checking, please refer to below. 12.3.1. Bottom View Note: (*1) is referred to No.2 of Check Check Table for RF part (P.40) (*2) is referred to Power Supply Circuit/Reset Circuit (P.12)

  • Page 56: Adjustment Standard (Charger Unit)

    KX-TG234SK/KX-TGA470B 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 57: Adjustment Standard (Handset)

    KX-TG234SK/KX-TGA470B 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 58: Things To Do After Replacing Ic Or X'tal

    KX-TG234SK/KX-TGA470B 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 59 KX-TG234SK/KX-TGA470B 12.6.1.2. Handset First, operate the PC setting according to The Setting Method of JIG (P.51). 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 60: Frequency Table

    KX-TG234SK/KX-TGA470B 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 61: Miscellaneous

    KX-TG234SK/KX-TGA470B 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 62 KX-TG234SK/KX-TGA470B 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 63: How To Replace The Flat Package Ic

    KX-TG234SK/KX-TGA470B 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 64 KX-TG234SK/KX-TGA470B 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 65: Terminal Guide Of The Ics, Transistors And Diodes

    KX-TG234SK/KX-TGA470B 13.3. Terminal Guide of the ICs, Transistors and Diodes 13.3.1. Base Unit (Reverse View) 2SC6054JSL, B1ABDM000001 PNWI1TG4741H DRC9113Z0L, 2SA1576S C0DBEYY00102 C2HBCY000107 PNWI2TG4741H B1GBCFYY0020 Cathode Anode DA2J10100L B1ACGP000008 DSC7003S0L PSVTUMG11NTR PQVDMD5S Cathode Cathode Cathode Anode Anode Anode B3AAB0000347 B0ECKM000008 PQVDPTZT2530...
  • Page 66 KX-TG234SK/KX-TGA470B Memo...

  • Page 67: Schematic Diagram

    KX-TG234SK/KX-TGA470B 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 68: Schematic Diagram (Base Unit_Main)

    KX-TG234SK/KX-TGA470B 14.2. Schematic Diagram (Base Unit_Main) ANT1 R807 RXON C822 C827 C892 ANT1 W 0.2mm W 0.15mm L 20mm 3rd layer 1st layer C894 C826 W 0.2mm L 10mm C820 1st layer 1.5p ANT2 DA801 C805 C895 C812 L809 2.7p 7.5n...
  • Page 69 KX-TG234SK/KX-TGA470B VCCA +3.0V REFERENCE Q141 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 C163 C173...

  • Page 70: Schematic Diagram (Base Unit_Operation)

    KX-TG234SK/KX-TGA470B 14.3. 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 LCD_BLT VDD1 VDD2 LCD_GND 13pin:TG4741 16pin:TG7741 LCD_RST LCD_CS LCD_CD CELL1_2 CELL2_2...
  • Page 71 KX-TG234SK/KX-TGA470B Memo...

  • Page 72: Schematic Diagram (Handset_Main)

    KX-TG234SK/KX-TGA470B 14.4. 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 73 KX-TG234SK/KX-TGA470B 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 74: Schematic Diagram (Handset_Led)

    KX-TG234SK/KX-TGA470B 14.5. Schematic Diagram (Handset_LED) KX-TGA470 SCHEMATIC DIAGRAM (Handset_LED)

  • Page 75: Schematic Diagram (Charger Unit)

    KX-TG234SK/KX-TGA470B 14.6. Schematic Diagram (Charger Unit) 1 (0.5W) 1 (0.5W) SCHEMATIC DIAGRAM (Charger Unit)
  • Page 76 KX-TG234SK/KX-TGA470B Memo...

  • Page 77: Printed Circuit Board

    KX-TG234SK/KX-TGA470B 15 Printed Circuit Board 15.1. Circuit Board (Base Unit_Main) 15.1.1. Component View C894 ANT1 C306 ANT2 C343 L102 L101 SA101 R321 R322 KX-TG474x/473xH P101 PNLB2013Z C341 C342 D101 SA102 DA802 X501 R891 R806 C509 C508 R509 MSG_LED KEYS_E ANS_LED...
  • Page 78 KX-TG234SK/KX-TGA470B 15.1.2. Bottom View For JIG ANT1 ANT2 UGND KX-TG474x/473xH C301 VBAT PNLB2013Z VBAT F301 R331 R332 3.0A C115 R115 +5.5V C331 C121 C122 R111 R122 C112 C510 C514 C457 VCCA C511 C458 C512 VREF C530 Q111 C513 L661 C461...

  • Page 79: Circuit Board (Base Unit_Operation)

    KX-TG234SK/KX-TGA470B 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-TG234 CIRCUIT BOARD (Base Unit_Operation (Component View))
  • Page 80 KX-TG234SK/KX-TGA470B Memo...

  • Page 81: Circuit Board (Handset_Main)

    KX-TG234SK/KX-TGA470B 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 82 KX-TG234SK/KX-TGA470B 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 83: Circuit Board (Handset_Led)

    KX-TG234SK/KX-TGA470B 15.4. Circuit Board (Handset_LED) PNLB1964Z KX-TGA470 CIRCUIT BOARD (Handset_LED (Component View))

  • Page 84: Circuit Board (Charger Unit)

    KX-TG234SK/KX-TGA470B 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 85: Cabinet And Electrical Parts (Base Unit)

    KX-TG234SK/KX-TGA470B 16 Exploded View and Replacement Parts List 16.1. Cabinet and Electrical Parts (Base Unit) E1 (*1) PCB1 PCB2 MIC1 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.48).

  • Page 86: Cabinet And Electrical Parts (Handset)

    (*1) This cable is fixed by welding. Refer to How to Replace the Handset LCD (P.50). (*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 87: Cabinet And Electrical Parts (Charger Unit)

    KX-TG234SK/KX-TGA470B 16.3. Cabinet and Electrical Parts (Charger Unit) 200-1 PCB200 200-3 200-2 200-4 Ref.No. Figure 2 8 mm...

  • Page 88: Accessories

    KX-TG234SK/KX-TGA470B 16.4. Accessories...

  • Page 89: Replacement Parts List

    KX-TG234SK/KX-TGA470B 16.5. Replacement Parts List Safety Ref. Part No. Part Name & Description Remarks 1. RTL (Retention Time Limited) PQMG10025W RUBBER PARTS, MIC Note: PNHR1584Z GUIDE, JACK PS-HB The “RTL” marking indicates that its Retention Time is PQJJ1T039L JACK, MODULAR K2ECYZ000001 JACK, DC Limited.
  • Page 90 KX-TG234SK/KX-TGA470B Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks R145 D0GA222JA021 2.2k C451 PQCUV0J106KB 10 R151 D0GA104JA021 100k C452 ECUE1H100DCQ 10p R152 ERJ2GEJ474X 470k C457 ECUE1C333KBQ 0.033 R160 ERJ3GEYJ911 C458 ECUE1C333KBQ 0.033...
  • Page 91 KX-TG234SK/KX-TGA470B Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks LED905 LNJ237W82RA B1ADCF000040 TRANSISTOR(SI) LED906 LNJ237W82RA DRC9113Z0L TRANSISTOR(SI) LED907 LNJ237W82RA DRC9113Z0L TRANSISTOR(SI) LED908 LNJ237W82RA 2SC6054JSL TRANSISTOR(SI) (RESISTORS) (DIODES) R901 D0GA271JA015 270...
  • Page 92 KX-TG234SK/KX-TGA470B Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks EEE0JA221WP C810 F1G1H2R5A480 2.5p EEE0JA221WP C811 ECUE1H101JCQ 100p EEE0JA221WP C813 F1G1H1R6A480 1.6p ECUE1H390JCQ 39p C820 F1G1H1R8A480 1.8p ECUE1A104KBQ 0.1 C822 ECUE1H100DCQ 10p ECUE1A104KBQ 0.1...
  • Page 93 KX-TG234SK/KX-TGA470B 16.5.4. Accessories Note: (*1) You can download and refer to the Operating Instructions (Instruction book) on TSN Server. Safety Ref. Part No. Part Name & Description Remarks PNLV226Z AC ADAPTOR PQJA10075Z CORD, TELEPHONE PNQX5092Z INSTRUCTION BOOK (*1) PNKE1132Z1 HANGER, BELT CLIP...
  • Page 94 Model No. KX-TGA470B Digital Cordless Answering System B: Black Version (for U.S.A.) Please file and use this supplement manual together with the service manual for Model No.KX-TG234SK/ KX-TGA470B, Order No. KM41202541CE. TABLE OF CONTENTS PAGE 1 REPLACEMENT PARTS LIST--------------------------------- 2 1.1.
  • Page 95 KX-TG234SK/KX-TGA470B 1 REPLACEMENT PARTS LIST 1.1. REFERENCE CHART Reason for Change *The following items (1-8) indicate the reason for change. See the “Notes” column for each part in ORIGINAL AND NEW PARTS COMPARISON LISTS. 1. Improve performance Remarks: *c: To share the parts with other models 2.
  • Page 96 Model No. KX-TGA470B Digital Cordless Answering System B: Black Version (for U.S.A.) Please file and use this supplement manual together with the service manual for Model No.KX-TG234SK/ KX-TGA470B, Order No. KM41202541CE. TABLE OF CONTENTS PAGE 1 REPLACEMENT PARTS LIST--------------------------------- 2 1.1.
  • Page 97 KX-TG234SK/KX-TGA470B 1 REPLACEMENT PARTS LIST 1.1. REFERENCE CHART Reason for Change *The following items (1-8) indicate the reason for change. See the “Notes” column for each part in ORIGINAL AND NEW PARTS COMPARISON LISTS. 1. Improve performance Remarks: *j : To meet the standards.
  • Page 98 Model No. KX-TGA470B Digital Cordless Answering System B: Black Version (for U.S.A.) Please file and use this supplement manual together with the service manual for Model No.KX-TG234SK/ KX-TGA470B, Order No. KM41202541CE. TABLE OF CONTENTS PAGE 1 REPLACEMENT PARTS LIST--------------------------------- 2 1.1.
  • Page 99 KX-TG234SK/KX-TGA470B 1 REPLACEMENT PARTS LIST 1.1. REFERENCE CHART Reason for Change *The following items (1-8) indicate the reason for change. See the “Notes” column for each part in ORIGINAL AND NEW PARTS COMPARISON LISTS. 1. Improve performance Remarks: *m : Discontinued (To be replaced with a new part) 2.

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