Panasonic KX-TG3521BXB Service Manual
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Panasonic KX-TG3521BXB Service Manual

Panasonic KX-TG3521BXB Service Manual

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Telephone Equipment
KX-TG3521BXB
KX-TG3521BXS
KX-TG3522BXB
KX-TG3522BXS
KX-TGA351BXB
KX-TGA351BXS
2.4 GHz Expandable Digital Cordless
Phone
Black Version
Silver Version
(for Asia, Middle Near East and Other areas)
© 2007 Panasonic Communications Co., Ltd. All
rights reserved. Unauthorized copying and distribu-
tion is a violation of law.
ORDER NO. KM40611250CE

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Summary of Contents for Panasonic KX-TG3521BXB

  • Page 1 KX-TG3522BXS KX-TGA351BXB KX-TGA351BXS 2.4 GHz Expandable Digital Cordless Phone Black Version Silver Version (for Asia, Middle Near East and Other areas) © 2007 Panasonic Communications Co., Ltd. All rights reserved. Unauthorized copying and distribu- tion is a violation of law.
  • Page 2 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS...

  • Page 3: Table Of Contents

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS TABLE OF CONTENTS PAGE PAGE 1 Safety Precaution ------------------------------------------------ 4 13.5. Schematic Diagram (Handset_RF Part)------------ 88 1.1. For Service Technicians --------------------------------- 4 13.6. Schematic Diagram (Charger Unit)------------------ 89 2 Warning -------------------------------------------------------------- 4 14 Printed Circuit Board ------------------------------------------ 91 2.1. Battery Caution--------------------------------------------- 4 14.1.

  • Page 4: Safety Precaution

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 1 Safety Precautions 1.1. For Service Technicians ICs and LSIs are vulnerable to static electricity. When repairing, the following precautions will help prevent recurring malfunctions. 1. Cover plastic parts boxes with aluminum foil. 2. Ground the soldering irons. 3. Use a conductive mat on worktable.
  • Page 5 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 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 manufac- turer’s specific instructions for the melting points of their products and any precautions for using their product with other materi-...

  • Page 6: Specifications

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 3 Specifications...

  • Page 7: Technical Descriptions

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4 Technical Descriptions 4.1. FHSS Description 4.1.1. Frequency The frequency range of 2.4 GHz - 2.48 GHz is used. Transmitting and receiving channel between base unit and handset is same frequency. Refer to Frequency Table (P.79). 4.1.2. FHSS (Frequency Hopping Spread Spectrum) This telephone is using an IC chip which has similar specification to WDCT (World Digital Cordless Telephone) and is the tele- phone system that can use multiple portable unit simultaneously.
  • Page 8 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.1.2.1. TDD Frame Format Sync Field (72 bit): Preamble 56 bit + SyncWord 16 bit Base unit (handset) adjusts the timing of reception so that reception of base unit (handset) can correspond to transmission of handset (base unit). It is necessary for sync-field that handset gets synchronization.
  • Page 9 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.1.3. Signal Flowchart in the Whole System Reception CN101 of the base unit is connected to the TEL line, and signal is entered through the bridge diode D101. While talking, the relay (Q141) is turned ON and amplified at the Q171, then led to DSP (IC501). The DSP encodes ADPCM and TDD/TDMA with FHSS to TX-DATA.

  • Page 10: Explanation Of Link Data Communication

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.2. Explanation of Link Data Communication 4.2.1. Calling 4.2.2. To Terminate Communication 4.2.3. Ringing...

  • Page 11: Block Diagram (Base Unit_Main)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.3. Block Diagram (Base Unit_Main)

  • Page 12: Block Diagram (Base Unit_Rf Part)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.4. Block Diagram (Base Unit_RF Part) TC_CTRL RSTN RXEN RXGAIN TXEN...

  • Page 13: Circuit Operation (Base Unit)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.5. Circuit Operation (Base Unit) General Description: (DSP, EEPROM) is a digital speech/signal processing system that implements all the functions of speech compression and memory management required in a digital telephone. The DSP system is fully controlled by a host processor DSP. The host processor provides activation and control of all that func- tions as follows.
  • Page 14 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.5.3. Power Supply Circuit Function: The power supply voltage from AC adaptor is converted to the desired voltage of each block. Circuit Operation: • Q300 and IC300: 4.0 V DCDC Converter • IC331: 3.3 V Regulator...
  • Page 15 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.5.3.1. Charge Circuit The voltage from the AC adaptor is supplied to the charge circuits. The charge is controlled by the handset.
  • Page 16 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.5.4. Reset Circuit Function: This circuit is used to initialize the microcomputer when it incorporates an AC adaptor. Circuit Operation: When the AC Adaptor is inserted into the unit, then the voltage is shifted by IC331 and power is supplied to the DSP.
  • Page 17 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.5.5. 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 18 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.5.6. Parallel Connection Detect Circuit Function: In order to disable call waiting and stutter tone functions when using telephones connected in parallel, it is necessary to have a circuit that judges whether a telephone connected in parallel is in use or not. This circuit determines whether the telephone con- nected in parallel is on hook or off hook by detecting changes in the T/R voltage.
  • Page 19 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.5.7. Calling Line Identification (Caller ID) Function: The caller ID is a chargeable ID which the user of a telephone circuit obtains by entering a contract with the telephone company to utilize a caller ID service. For this reason, the operation of this circuit assumes that a caller ID service contract has been entered for the circuit being used.

  • Page 20: Block Diagram (Handset)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.6. Block Diagram (Handset) IC541 X501 EEPROM 13.824 MHz Q531 CHARGE CHG_DET DETECT OSC_IN Q362, Q363 RF part TX_DATA CHG_CTL RX_DATA CHARGE PA_CONT CONTROL RADIO_EN CON_EN Q521 SYN_LE2 SYN_OUT RESET RESET SYN_DATA Q361 D361 SYN_CLK CHARGE SYN_LE1 IC521 RX_GAIN...

  • Page 21: Block Diagram (Handset_Rf Part)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.7. Block Diagram (Handset_RF Part) TC_CTRL RSTN RXEN RXGAIN TXEN...

  • Page 22: Circuit Operation (Handset)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.8. Circuit Operation (Handset) 4.8.1. Construction The circuit mainly consists of DSP and RF part as shown in the block diagram. 4.8.1.1. DSP: IC501 Function • Battery Low, Power down detect circuit • Ringer Generation • Interface circuit RF part, Speaker, Mic, LED, Key scan, LCD, Headset...
  • Page 23 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.8.2. Power Supply Circuit Voltage is supplied separately to each block.
  • Page 24 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.8.3. Charge Circuit When the handset is put on the cradle of the base unit or the charger, the power is supplied from CHARGE+ and CHARGE- ter- minals to charge the battery via D361 and R366 or Q361. The voltage between CHARGE+ and CHARGE- flows R531 → Q531 →...
  • Page 25 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.8.5. Sending Signal The voice signal from the microphone is input to DSP (90, 91). CN431 is the headset jack. When the headphone is connected, the Q431 detect it. The input from the microphone of the handset (MIM, MIP) is cut and the microphone signal from the headset is input to DSP (95).

  • Page 26: Circuit Operation (Rf Part)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.9. Circuit Operation (RF Part) General Description: RF part includes Transmitter and Receiver functions. Digital signals (Mainly voice data) that come from DSP, are modulated and are transmitted. On the other hand, received signals are demodulated and go out to DSP.
  • Page 27 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.9.1. 2.4GHz Mod/Demod Circuit (Base Unit RF Part) IC701 incorporates all of the modulation and demodulation functions. TX Digital data (TX_DATA) from DSP is supplied to pin 27 of IC701, and then 2.4 GHz TX modulated signal is output from pin1. This TX signal is filtered by BPF (FL701) and supplied to Antenna.
  • Page 28 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.9.2. 2.4GHz Mod/Demod Circuit (Handset RF Part) IC701 incorporates all of the modulation and demodulation functions. TX Digital data (TX_DATA) from DSP is supplied to pin 27 of IC701, and then 2.4 GHz TX modulated signal is output from pin 1. This TX signal is filtered by BPF (FL701) and supplied to Antenna.

  • Page 29: Circuit Operation (Charger Unit)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.10. Circuit Operation (Charger Unit) The voltage from the AC adaptor is supplied to the charge circuits. Main charge (180~250 mA at the Battery) of maximum 7- hours is started soon after the handset is placed on the charger unit. Then it changes to Trickle charge to prevent from over- charging.

  • Page 30: Signal Route

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.11. Signal Route RF part signal route...

  • Page 31: Location Of Controls And Components

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 5 Location of Controls and Components 5.1. Controls 5.1.2. Handset 5.1.1. Base Unit 5.2. Display...

  • Page 32: Installation Instructions

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 6 Installation Instructions 6.1. Setting Up the Base Unit 6.2. Setting Up the Handset 6.1.1. Connecting the AC Adaptor and 6.2.1. Connecting the AC Adaptor Telephone Line Cord 6.3. Battery Installation/ Replacement...

  • Page 33: Battery Charge

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 6.4. Battery Charge 6.4.2. Panasonic Battery Performance 6.4.1. Battery Level...

  • Page 34: Operation Instructions

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 7 Operation Instructions 7.1. Programmable Settings You can customize the unit by programming the following features using the handset. To access the features, there are 2 methods: - scrolling through the display menus - using the direct commands • Mainly the direct command method is used in this service manual.
  • Page 35 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 7.1.2. Programming using the Direct Commands...

  • Page 36: Copying Handset Phonebook Items

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 7.2. Copying Handset Phonebook Items You can copy one or all of the phonebook items from one handset to another. 7.2.1. Copying All Items 7.3. Dial Lock For Service Hint: *: If the current password is forgotten, enter “726276642” and you will be able to go to next step.

  • Page 37: Error Messages

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 7.4. Error Messages...

  • Page 38: Troubleshooting

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 7.5. Troubleshooting...
  • Page 39 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS...

  • Page 40: Test Mode

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 8 Test Mode 8.1. Adjustment and Test Mode Flow Chart 8.1.1. Test Burst Mode for Base Unit Note: (*1) When you check test mode, connect to the external Buttons because base unit has only LOCATOR key. Refer to Flow Sol- der Side View (P.77).
  • Page 41 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 8.1.2. TX-CW Mode for Base Unit Note: (*1) When you check test mode, connect to the external Buttons because base unit has only LOCATOR key. Refer to Flow Sol- der Side View (P.77). (*2) Refer to Check Table for RF part (P.61).
  • Page 42 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 8.1.3. RX-CW Test Mode for Base Unit Note: (*1) When you check test mode, connect to the external Buttons because base unit has only LOCATOR key. Refer to Flow Sol- der Side View (P.77). (*2) Refer to Check Table for RF part (P.61).
  • Page 43 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 8.1.4. Test Link Mode for Base Unit Note: (*1) When you check test mode, connect to the external Buttons because base unit has only LOCATOR key. Refer to Flow Sol- der Side View (P.77). (*2) Refer to Test Link Mode for Handset (P.48). If you can not proceed to the next step, refer to Registering a Handset (P.58).
  • Page 44 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 8.1.5. Adjustment Mode for Base Unit Cross Reference Check and Adjust Frequency (Base Unit) (P.75) Note: (*1) Refer to the table below, if using Frequency Counter for checking. TEST MODE Frequency (1 Channel) → 13.824 MHz 2400.724512 MHz →...
  • Page 45 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 8.1.6. Test Burst Mode for Handset Note: (*1) LCD displays the Channel number. (exception: default/ CH00 = 1ch.) (*2) Refer to Check Table for RF part (P.61).
  • Page 46 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 8.1.7. TX-CW Mode for Handset Note: (*1) LCD displays the Channel number. (exception: default/ CH00 = 1ch.) (*2) Refer to Check Table for RF part (P.61).
  • Page 47 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 8.1.8. RX-CW Test Mode for Handset Note: (*1) LCD displays the Channel number. (exception: default/ CH00 = 1ch.) (*2) Refer to Check Table for RF part (P.61).
  • Page 48 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 8.1.9. Test Link Mode for Handset Note: (*1) LCD displays the Channel number. (exception: default/ CH00 = 1ch.) (*2) If you can not proceed to the next step, refer to Registering a Handset (P.58). (*3) for factory use only.
  • Page 49 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 8.1.10. Adjustment Mode for Handset Cross Reference (*1) Adjust Battery Low Detector Voltage (Handset) (P.75) (*2) These are the default values. (*3) These values may not be fixed depending on the battery strength. (*4) Refer to the table below, if using Frequency Counter for checking.

  • Page 50: Service Mode

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 9 Service Mode 9.1. How to Clear User Setting Units are reset to the Factory settings by this operation (Erase stored Phone numbers, Caller list and etc.). This operation should not be performed for a usual repair. 9.1.1. Handset Note: (*1) Be sure to short the battery terminals of the handset with a lead wire, etc.

  • Page 51: Copying Phonebook Items When Repairing

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 9.2. 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. Refer to the following procedures.
  • Page 52 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS Note: • 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 (P.58). • To cancel the handset, refer to Deregistering a Handset (P.58).

  • Page 53: Replacing P.c. Board Of Base Unit With Used P.c. Board

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 9.3. Replacing P.C. Board of Base Unit with Used P.C. Board The base unit can be repaired by replacing the P.C. board with the used P.C. board of KX-TG3521, KX-TG3522 or any other compatible P.C. board. (*1) The previous handset’s ID and user information are stored in the P.C. board of the substitute base unit.
  • Page 54 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 9.3.2. For Models with 2 or More Handsets Included Replace the P.C. board (a) by the normal P.C. board (b). Register the handset (A-1) to the base unit (A). • Refer to Registering a Handset (P.58). Reset the setting information existed in P.C. board (b).

  • Page 55: Troubleshooting Guide

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 10 Troubleshooting Guide 10.1. Troubleshooting Flowchart Cross Reference: Check Power (P.56) Check Handset Transmission (P.65) Check Battery Charge (P.56) Check Handset Reception (P.65) Check Link (P.57) Check Caller ID (P.65) Check the RF part (P.58)
  • Page 56 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 10.1.1. Check Power Cross Reference: Note: Power Supply Circuit (P.14) DSP is IC501. Reset Circuit (P.16) (*1) Refer to Specifications (P.6) for part number and sup- ply voltage of AC adaptor. (*2) Refer to Circuit Board (Base Unit_Main) (P.91).
  • Page 57 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 10.1.3. Check Link Note: DSP is IC501. (*1) Refer to Finding out the Defective part (P.58). Cross Reference: Check the RF part (P.58)
  • Page 58 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 10.1.4. Check the RF part 10.1.4.1. 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: (*1) HS: Handset (*2) BU: Base Unit 10.1.4.1.1.
  • Page 59 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 10.1.4.1.3. Deregistering All Handsets by the Base Unit...
  • Page 60 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 10.1.4.2. RF Check Flowchart Each item (1 ~ 6) of RF Check Flowchart corresponds to Check Table for RF part (P.61). Please refer to the each item. Note: (*1) Refer to Things to Do after Replacing IC or X’tal (P.75)
  • Page 61 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 10.1.4.3. 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 62 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 10.1.4.4. 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 63 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 10.1.4.5. RF-DSP Interface Signal Wave Form Test Burst Mode...
  • Page 64 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS Test Burst Mode...
  • Page 65 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 10.1.5. Check Handset Transmission Cross Reference: Signal Route (P.30) 10.1.6. Check Handset Reception Cross Reference: Signal Route (P.30) Note: When checking the RF part, Refer to Check the RF part (P.58). 10.1.7. Check Caller ID Cross Reference: Telephone Line Interface (P.17) Calling Line Identification (Caller ID) (P.19)

  • Page 66: How To Replace The Flat Package

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 10.2. How to Replace the Flat Package IC 10.2.1. 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 67 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 10.2.3. 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 68: How To Replace The Llp

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 10.3. How to Replace the LLP (Leadless Leadframe Package) IC 10.3.1. 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 69 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 10.3.4. 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.

  • Page 70: Disassembly And Assembly Instructions

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 11 Disassembly and Assembly Instructions 11.1. Disassembly Instructions 11.1.1. Base Unit...
  • Page 71 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 11.1.2. Handset...
  • Page 72 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 11.1.3. Charger Unit...

  • Page 73: How To Replace The Handset Lcd

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 11.2. How to Replace the Handset LCD...

  • Page 74: Antenna Soldering Work

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 11.3. Antenna soldering work 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. Solder the antenna P.C. board as below.

  • Page 75: Measurements And Adjustments

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 12 Measurements and Adjustments 12.1. Things to Do after Replacing IC or X’tal 12.1.1. Preparation Equipment: Frequency counter Check Point for measurement: BCK Checking tolerance: 13.824 MHz ± 100 Hz (Base Unit)/13.824 MHz ± 100 Hz (Handset) 12.1.2. Check and Adjust Frequency (Base Unit) 1.

  • Page 76: Base Unit Reference Drawing

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 12.2. Base Unit Reference Drawing When connecting the simulator equipment for checking, please refer to below. 12.2.1. Component View 9.0 V CN101 Spectrum analyzer CN301 JOINT1 ANT1 FL701 C711 L703 L713 L702 D703 L704 L706 C710 C704 C706 C743...
  • Page 77 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 12.2.2. Flow Solder Side View ANT_HOT DCM DCM2 ANT_GND DCP2 D101 IC612 Q141 BCLK Q143 Q142 Q156 TEST SW Q161 Button 2 KEY3/TE KEY2 Button 1 KEY1 KEYB FCLK FRST Button 3 IC611 MIN2 MIP2 MIC1 PQUP11457Z...

  • Page 78: Handset Reference Drawing

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 12.3. Handset Reference Drawing When connecting the simulator equipment for checking, please refer to below. Note: (*1) is referred to No.3 of Check Table for RF part (P.61).

  • Page 79: Frequency Table

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 12.4. Frequency Table Channel TX/RX Frequency TEST MODE Frequency (MHz) (MHz) Channel TX/RX Frequency TEST MODE Frequency 2457.104150 2456.914307 (MHz) (MHz) 2457.994043 2457.804199 2400.914355 2400.724512 2458.887891 2458.698047 2401.808203 2401.618359 2459.777783 2459.587939 2402.698096 2402.508252 2460.671631 2460.481787 2403.591943 2403.402100 2461.561523 2461.371680 2404.481836...
  • Page 80 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS Memo...

  • Page 81: Schematic Diagram

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 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.

  • Page 82: Schematic Diagram (Base Unit_Main)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 13.2. Schematic Diagram (Base Unit_Main) RF Interface IC612 V_PA V_RF VOUT PA_CONT PA_CONT SYN_OUT SYN_OUT 4.0V SYN_DATA SYN_DATA SYN_CLK SYN_CLK SYN_EN VOUT SYN_EN TX_DATA TX_DATA IC301 RX_GAIN RX_GAIN RX_EN RX_EN 3.3V TX_EN TX_EN SH_CTRL SH_CTRL RX_DATA RX2 RX1 RF_RSTN...
  • Page 83 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 4.0V 3.3V 4.0V CONVERTOR IC331 Q300 L300 22uH VOUT VDET *RESET REFERENCE 1XX : TEL LINE 3XX : POWER, CHARGE 4XX : RESET, MIC, SP IC300 5XX : DSP, RF I/F 6XX : FLASH, KEY, LCD 7XX : RF(2.4G) ON/*OFF 8XX : RF(5.8G)

  • Page 84: Schematic Diagram (Base Unit_Rf Part)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 13.3. Schematic Diagram (Base Unit_RF Part) PA_CONT 2.5 V (MOD_EN) V_PA L702 V_RF 10nH 2.5 V SYN_OUT SYN_DATA SYN_EN SYN_CLK R719 TX_DATA L705 R730 RX_GAIN 10nH C760 D10P C790 K1000P C737 K470P C783 K1000P C791 C717 2.4 GHz TX...
  • Page 85 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS Memo...

  • Page 86: Schematic Diagram (Handset_Main)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 13.4. Schematic Diagram (Handset_Main) RF circuit BCLK BCLK Flash memory for booting RSSI RSSI TX_DATA TX_DATA PA_CONT PA_CONT RX_EN *RESET RX_EN TX_EN TX_EN IC546 RX_GAIN RX_GAIN DSP Part (control circuit) RX_DATA RX_DATA RF control line R540 C540 K0.1 X501 SHCTRL 13.824MHZ...
  • Page 87 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS TEST SIGNAL FREQUENCY: 1kHz SP phone TX Voice circuit -43 dBm/600 Rear speaker 30 mVp-p C427 D10P L427 NC SP phone RX (MIC Mute: ON) L426 NC 1.8 Vp-p/8 (Vol. Max) Headset TX R431 -37 dBm/600 Headset detection TR...

  • Page 88: Schematic Diagram (Handset_Rf Part)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 13.5. Schematic Diagram (Handset_RF Part) PA_CONT 3.3 V (MOD_EN) V_PA L702 V_RF 10nH 2.5 V SYN_OUT SYN_DATA SYN_EN SYN_CLK R719 TX_DATA L705 R730 RX_GAIN 10nH C760 D10P C790 K1000P C737 K470P C783 K1000P C717 C791 D10P 2.4 GHz TX...

  • Page 89: Schematic Diagram (Charger Unit)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 13.6. Schematic Diagram (Charger Unit) NC: No Components SCHEMATIC DIAGRAM (Charger Unit)
  • Page 90 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS Memo...

  • Page 91: Printed Circuit Board

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 14 Printed Circuit Board 14.1. Circuit Board (Base Unit_Main) 14.1.1. Component View V_PA V_RF CN101 CN301 JOINT1 ANT1 FL701 C711 L703 L713 L702 D703 L704 L706 C710 C704 C706 C743 L701 TP_TESTN C741 L790 C792 IC701 C744 R706 C760...
  • Page 92 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 14.1.2. Flow Solder Side View ANT_HOT DCM DCM2 ANT_GND DCP2 D101 IC612 Q141 BCLK Q143 Q142 Q156 Q161 KEY3/TE KEY2 KEY1 KEYB FCLK FRST IC611 MIN2 MIP2 MIC1 PQUP11457Z KX-TG3521/3522 CIRCUIT BOARD (Base Unit_Main (Flow Solder Side View))

  • Page 93: Circuit Board (Base Unit_Rf Part)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 14.2. Circuit Board (Base Unit_RF Part) FL701 C711 L703 L713 L702 D703 L704 L706 C710 C706 C704 C743 L701 TP_TESTN C741 L790 C792 IC701 C744 R706 C760 C746 C766 C765 C717 C780 KX-TG3521/3522 CIRCUIT BOARD (Base Unit_RF Part (Component View))

  • Page 94: Circuit Board (Base Unit_Antenna)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 14.3. Circuit Board (Base Unit_Antenna) KX-TG3521/3522 CIRCUIT BOARD (Base Unit_Antenna)

  • Page 95: Circuit Board (Handset_Main)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 14.4. Circuit Board (Handset_Main) 14.4.1. Component View KX-TGA30 R PQUP11462Z L705 R719 C752 C756 C783 RA701 C737 C790 R730 R709 C761 C784 C791 C722 R791 C777 C796 C738 C776 R740 C798 C762 C718 L711 R731 D704 C763 R743 C710...
  • Page 96 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 14.4.2. Flow Solder Side View LED561 SYN_OUT TAPE LED557 LED559 LED558 LED555 LED556 LEFT MENU RIGHT TALK BACK NEXT PAUSE DOWN HOLD FLASH KX-TGA351 CIRCUIT BOARD (Handset (Flow Solder Side View))

  • Page 97: Circuit Board (Handset_Rf Part)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 14.5. Circuit Board (Handset_RF Part) L705 R719 C752 C756 C783 RA701 C737 C790 R730 R709 C761 C784 C791 C722 R791 C777 C796 C776 C738 R740 C798 C762 C718 R731 L711 D704 C763 R743 C710 C779 R741 TP_TESTN C764 R742...

  • Page 98: Circuit Board (Charger Unit)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 14.6. Circuit Board (Charger Unit) 14.6.1. Component View PQJT01 PQHG PQHG01 PQHG02 PQHG PQJT02 PQLV30054 PQUP11464Z CIRCUIT BOARD (Charger Unit (Component View)) 14.6.2. Flow Solder Side View PQUP11464Z PQLV30054 CIRCUIT BOARD (Charger Unit (Flow Solder Side View))

  • Page 99: Appendix Information Of Schematic Diagram

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 15 Appendix Information of Schematic Diagram 15.1. CPU Data (Base Unit) 15.1.1. IC501 Description High High_Z 60 NC Description High High_Z 61 NC GNDPA 62 NC SPOUTP 63 KEY_IN3 Key In BCLK 64 KEY_IN2 Key In TXMOD 65 KEY_IN1...

  • Page 100: Cpu Data (Handset)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 15.2. CPU Data (Handset) 15.2.1. IC501 Description High High_Z 60 NC Normal Description High High_Z 61 NC Normal GNDPA 62 NC Normal SPOUTP 63 KEYSTROBE _E Active BCLK 64 KEYSTROBE _D Active RSSI 65 KEYSTROBE _C Active 66 KEYSTROBE _B...

  • Page 101: Explanation Of Ic Terminals (Rf Part)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 15.3. Explanation of IC Terminals (RF Part) IC701 15.3.1.

  • Page 102: Terminal Guide Of The Ics, Transistors And Diodes

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 15.4. Terminal Guide of the ICs, Transistors and Diodes 15.4.1. Base Unit 15.4.2. Handset...

  • Page 103: Exploded View And Replacement Parts List

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 16 Exploded View and Replacement Parts List 16.1. Cabinet and Electrical Parts (Base Unit)

  • Page 104: Cabinet And Electrical Parts (Handset)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 16.2. Cabinet and Electrical Parts (Handset) Note: (*1) This cable is fixed by welding. Refer to How to Replace the Handset LCD (P.73). (*2) Attach the SPACER (No. 121) to the exact location described above.

  • Page 105: Cabinet And Electrical Parts (Charger Unit)

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 16.3. Cabinet and Electrical Parts (Charger Unit)

  • Page 106: Accessories And Packing Materials

    KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 16.4. Accessories and Packing Materials 16.4.1. KX-TG3521BXB/BXS...
  • Page 107 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 16.4.2. KX-TG3522BXB/BXS...
  • Page 108 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS 16.4.3. KX-TGA351BXB/BXS...

  • Page 109: Replacement Parts List

    PQHA10023Z RUBBER PARTS, FOOT CUSHION After the discontinuation of this assembly in production, PQGT19716Z NAME PLATE (for KX-TG3521BXB) (for KX-TG3522BXB) the item will continue to be available for a specific period PQGT19648Z NAME PLATE (for KX-TG3521BXS) of time.
  • Page 110 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks (RESISTORS) C166 EEE1CA100SR R111 ERJ3GEYJ104 100K C167 ECUV1A224KBV 0.22 R112 ERJ3GEYJ104 100K C172 ECUE1H272KBQ 0.0027 R113 ERJ3GEYJ103 C176 PQCUV0J106KB R114 ERJ3GEYJ473 C177 ECUE1H100DCQ...
  • Page 111 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C798 ECJ0EC1H0R5C 0.5P IC501 C2HBBY000067 IC (*1) (OTHERS) IC521 C0EBF0000179 PQUP11466Z ANTENNA P.C.BOARD ASS'Y (RTL) IC541 PQWIG3521BXR IC (*1) PQMC10493Z MAGNETIC SHIELD, COVER...
  • Page 112 KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R523 ERJ2GEJ224 220K C740 ECUE1C103KBQ 0.01 R525 ERJ2GEJ102 C741 ECUE1H102KBQ 0.001 R526 ERJ2GEJ223 C742 PQCUV0J475MB R528 ERJ2GEJ104 100K C744 ECUE1A104KBQ R534 ERJ2GEJ103 C746 ECUE1H222KBQ 0.0022...
  • Page 113 16.5.4. Accessories and Packing Materials P203 PQPK15864Z GIFT BOX Note: 16.5.5. Screws (*1) You can download and refer to the Operating Instruc- tions (Instruction book) on TSN Server. 16.5.4.1. KX-TG3521BXB/BXS Ref. Part No. Part Name & Description Remarks XTW26+T8PFJ TAPPING SCREW XTW2+R10PFJ TAPPING SCREW Ref.

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