Panasonic KX-TG5776S Service Manual
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Panasonic KX-TG5776S Service Manual

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Telephone Equipment
KX-TG5776S
KX-TG5777S
KX-TGA571S
5.8 GHz Expandable Digital Cordless
Answering System
5.8 GHz Expandable Digital Cordless
Answering System with Two Handsets
Silver Version
(for U.S.A.)
© 2006 Panasonic Communications Co., Ltd. All
rights reserved. Unauthorized copying and distribu-
tion is a violation of law.
ORDER NO. KM40602997CE
F12

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  • Page 1 5.8 GHz Expandable Digital Cordless Answering System 5.8 GHz Expandable Digital Cordless Answering System with Two Handsets Silver Version (for U.S.A.) © 2006 Panasonic Communications Co., Ltd. All rights reserved. Unauthorized copying and distribu- tion is a violation of law.
  • Page 2 KX-TG5776S/KX-TG5777S/KX-TGA571S...

  • Page 3: Table Of Contents

    KX-TG5776S/KX-TG5777S/KX-TGA571S TABLE OF CONTENTS PAGE PAGE 1 Safety Precaution ------------------------------------------------ 4 13.7. Schematic Diagram (Charger Unit)---------------- 102 1.1. For Service Technicians --------------------------------- 4 14 Printed Circuit Board ---------------------------------------- 103 2 Warning -------------------------------------------------------------- 4 14.1. Circuit Board (Base Unit_Main) -------------------- 103 2.1.

  • Page 4: Safety Precaution

    KX-TG5776S/KX-TG5777S/KX-TGA571S 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-TG5776S/KX-TG5777S/KX-TGA571S 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-TG5776S/KX-TG5777S/KX-TGA571S 3 Specifications...

  • Page 7: Technical Descriptions

    KX-TG5776S/KX-TG5777S/KX-TGA571S 4 Technical Descriptions 4.1. FHSS Description 4.1.1. Frequency The frequency range of 5.76 GHz-5.84 GHz is used. Transmitting and receiving channel between Base Unit and Handset is same frequency. Refer to Frequency Table (P.88). 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-TG5776S/KX-TG5777S/KX-TGA571S 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-TG5776S/KX-TG5777S/KX-TGA571S 4.1.3. Signal Flowchart in the Whole System Reception CN101 of the Base Unit is connected to the TEL line, and signal is enter 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 TXMOD.

  • Page 10: Explanation Of Link Data Communication

    KX-TG5776S/KX-TG5777S/KX-TGA571S 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-TG5776S/KX-TG5777S/KX-TGA571S 4.3. Block Diagram (Base Unit_Main)

  • Page 12: Block Diagram (Base Unit_Rf Part)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 4.4. Block Diagram (Base Unit_RF Part) TC_CTRL RSTN RXEN TXEN REFIN RXGAIN RXEN TXEN 5.8GHz...

  • Page 13: Circuit Operation (Base Unit)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 4.5. Circuit Operation (Base Unit) General Description: (DSP, Flash Memory) 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 DSP system is fully controlled by a host processor DSP. The host processor provides activation and control of all that functions as follows.
  • Page 14 KX-TG5776S/KX-TG5777S/KX-TGA571S 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-TG5776S/KX-TG5777S/KX-TGA571S 4.5.3.1. Charge Circuit The voltage from the AC adaptor is supplied to the charge circuits. Main charge (130 ~ 220 mA at the Battery) of maximum 7-hours is started soon after the Handset is placed on the Base Unit. Then it changes to Trickle charge to prevent from overcharging.
  • Page 16 KX-TG5776S/KX-TG5777S/KX-TGA571S 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-TG5776S/KX-TG5777S/KX-TGA571S 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-TG5776S/KX-TG5777S/KX-TGA571S 4.5.6. Auto Disconnect circuit Function: This circuit is used to detect the fact that another telephone connected to the same line is OFF-HOOK while the unit is in a receiving status or OGM transmitting status. Circuit Operation: The voltage of pin 90 of IC501 is monitored. If a parallel-connected telephone is put into OFF-HOOK status, the presence/ absence of a parallel connection is determined when the voltage changes by 0.2 V or more.
  • Page 19 KX-TG5776S/KX-TG5777S/KX-TGA571S 4.5.7. 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 connected in parallel is on hook or off hook by detecting changes in the T/R voltage.
  • Page 20 KX-TG5776S/KX-TG5777S/KX-TGA571S 4.5.8. 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 21 KX-TG5776S/KX-TG5777S/KX-TGA571S 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 22: Block Diagram (Handset_Main)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 4.6. Block Diagram (Handset_Main) IC246 IC241 X201 FLASH EEPROM 13.824MHz Q231 MEMORY CHARGE DETECT CHG_DET OSC_IN Q361 Q362, Q363 RF part TX_DATA CHARGE CHG_CTL RX_DATA CHARGE PA_CONT CONTROL RADIO_EN D361 CON_EN R376~R379 SYN_LE2 SYN_OUT CHARGE IBAT1 SYN_DATA CURRENT IBAT2...

  • Page 23: Block Diagram (Handset_Rf Part)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 4.7. Block Diagram (Handset_RF Part) TC_CTRL RSTN RXEN TXEN REFIN RXGAIN RXEN TXEN 5.8GHz...

  • Page 24: Circuit Operation (Handset)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 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: IC201 Function • Battery Low, Power down detect circuit • Ringer Generation • Interface circuit RF part, Speaker, Mic, LED, Key scan, LCD, Headset...
  • Page 25 KX-TG5776S/KX-TG5777S/KX-TGA571S 4.8.2. Power Supply Circuit Voltage is supplied separately to each block.
  • Page 26 KX-TG5776S/KX-TG5777S/KX-TGA571S 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- terminals to charge the battery via Q361 or R366, and D361. The voltage between CHARGE+ and CHARGE- flows R231 →...
  • Page 27 KX-TG5776S/KX-TG5777S/KX-TGA571S 4.8.5. Sending Signal The voice signal from the microphone is input to DSP (89, 90). CN331 is the headset jack. When the headphone is connected, the Q331 detect it. The input from the microphone of the Handset (MIN, MIP) is cut and the microphone signal from the headset is input to DSP (94).
  • Page 28 KX-TG5776S/KX-TG5777S/KX-TGA571S 4.8.7. USB Signal Q291-Base1 detects that USB-cable is connected to the unit, which is recognized by pin 39 of DSP. Then 3.3 V is made by IC291 under the control of pin 21 of DSP. And a signal is output to inform of the completion of the USB- cable connection.

  • Page 29: Circuit Operation (Rf Part)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 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 30 KX-TG5776S/KX-TG5777S/KX-TGA571S 4.9.1. Power Supply Circuit As indicated below, the various voltages are supplied to each block. V_PA, about 4.0 V at Base Unit or 3.1 V at Handset, is supplied to the Power amplifier in 5.8 GHz PA circuit. IC841 is 3.0 V (Base Unit) or 2.8 V (Handset) Regulators, and IC761 is a 2.5 V Regulator. They output Vcc_5.8 GHz, and Vcc_2.4...
  • Page 31 KX-TG5776S/KX-TG5777S/KX-TGA571S 4.9.2. 2.4 GHz Mod/Demod Circuit 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 goes into the 5.8 GHz Converter circuit. 2.4 GHz RX signal from 5.8 GHz Converter circuit is passed through matching circuit and supplied to pin 4 of IC701, then demodulated...
  • Page 32 KX-TG5776S/KX-TG5777S/KX-TGA571S 4.9.3. 5.8 GHz Converter Circuit This block converts frequency of TX signal and RX signal. IC801 includes TX-MIXER, RX-MIXER, PLL and VCO modules internally. The VCO module is tuned by PLL synthesizer module, and generates 3.4 GHz Local signal. Reference clock (13.824 MHz) from DSP block is supplied to pin 7 of IC701.
  • Page 33 KX-TG5776S/KX-TG5777S/KX-TGA571S 4.9.4. 5.8 GHz PA (Power Amplifier), 5.8 GHz LNA (Low Noise Amplifier) and Antenna Switch Circuit PA block amplifies power of 5.8 GHz TX signal. 5.8 GHz TX signal from 5.8 GHz Converter circuit is filtered by 5.8 GHz-BPF FL811, and amplified by Power amplifier (PA) block of IC851.

  • Page 34: Circuit Operation (Charger Unit)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 4.10. Circuit Operation (Charger Unit) The voltage from the AC adaptor is supplied to the charge circuits. Main charge (130 ~ 220 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 overcharging.

  • Page 35: Signal Route

    KX-TG5776S/KX-TG5777S/KX-TGA571S 4.11. Signal Route Each signal route is as follows.
  • Page 36 KX-TG5776S/KX-TG5777S/KX-TGA571S Each signal route is as follows. RF part signal route...

  • Page 37: Location Of Controls And Components

    KX-TG5776S/KX-TG5777S/KX-TGA571S 5 Location of Controls and Components 5.1. Controls 5.1.1. Base Unit...

  • Page 38: Displays

    KX-TG5776S/KX-TG5777S/KX-TGA571S 5.2. Displays 5.1.2. Handset 5.2.1. Base Unit Display Items 5.2.2. Handset Display Items...
  • Page 39 KX-TG5776S/KX-TG5777S/KX-TGA571S 5.2.3. Handset Menu Icons...

  • Page 40: Installation Instructions

    KX-TG5776S/KX-TG5777S/KX-TGA571S 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 Charger (KX- Telephone Line Cord TG5777/KX-TGA571 only) 6.1.1.1. If you subscribe to a DSL service...

  • Page 41: Battery Installation/Replacement

    KX-TG5776S/KX-TG5777S/KX-TGA571S 6.3. Battery Installation/Replace- 6.4. Battery Charge ment Note for service: The battery strength may not be indicated correctly if the battery is disconnected and connected again, even after it is fully charged. In that case, by recharging the battery as mentioned above, you will get a correct indication of the battery strength.
  • Page 42 KX-TG5776S/KX-TG5777S/KX-TGA571S 6.4.1. Battery Level 6.4.2. Panasonic Battery Performance...

  • Page 43: Expanding Your Phone System

    KX-TG5776S/KX-TG5777S/KX-TGA571S 6.5. Expanding Your Phone System You can expand the phone system by registering the following handsets and other devices to a single base unit: max. 8 Note for service: For these handsets and devices, please refer to each Service Manual.

  • Page 44: Operation Instructions

    KX-TG5776S/KX-TG5777S/KX-TGA571S 7 Operation Instructions 7.1. Symbols Used in These Operating Instructions...

  • Page 45: Programmable Settings

    KX-TG5776S/KX-TG5777S/KX-TGA571S 7.2. Programmable Settings 7.2.1. Programming by Scrolling through the Display Menus...
  • Page 46 KX-TG5776S/KX-TG5777S/KX-TGA571S...
  • Page 47 KX-TG5776S/KX-TG5777S/KX-TGA571S 7.2.2. Programming Using the Direct Commands...
  • Page 48 KX-TG5776S/KX-TG5777S/KX-TGA571S...

  • Page 49: Error Messages

    KX-TG5776S/KX-TG5777S/KX-TGA571S 7.3. Error Messages...

  • Page 50: Troubleshooting

    KX-TG5776S/KX-TG5777S/KX-TGA571S 7.4. Troubleshooting If the handset display shows error messages, see “Error Messages (P.49)” for the Cause & Solution.
  • Page 51 KX-TG5776S/KX-TG5777S/KX-TGA571S...
  • Page 52 KX-TG5776S/KX-TG5777S/KX-TGA571S...
  • Page 53 KX-TG5776S/KX-TG5777S/KX-TGA571S...

  • Page 54: Test Mode

    KX-TG5776S/KX-TG5777S/KX-TGA571S 8 Test Mode 8.1. Adjustment and Test Mode Flow Chart 8.1.1. Test Burst Mode for Base Unit Note: (*1) LCD displays the Channel number. (*2) Refer to Check Table for RF part (P.72) and RX-CW Test Mode for Handset (P.59) for proper Handset settings.
  • Page 55 KX-TG5776S/KX-TG5777S/KX-TGA571S 8.1.2. RX-CW Test Mode for Base Unit Note: (*1) LCD displays the Channel number. (*2) Refer to Check Table for RF part (P.72) and Test Burst Mode for Handset (P.58) for proper Handset settings.
  • Page 56 KX-TG5776S/KX-TG5777S/KX-TGA571S 8.1.3. Test Link Mode for Base Unit Note: (*1) LCD displays the Channel number. (*2) LCD displays the number of selected power. (*3) Refer to Test Link Mode for Handset (P.60). If can not proceed to the next step, refer to Registering a Handset (P.70).
  • Page 57 KX-TG5776S/KX-TG5777S/KX-TGA571S 8.1.4. Adjustment Mode for Base Unit Cross Reference Check and Adjust X501 (Base Unit) Frequency (P.85) Note: (*1) This is an adjustment value (hex.).
  • Page 58 KX-TG5776S/KX-TG5777S/KX-TGA571S 8.1.5. 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.72) and RX-CW Test Mode for Base Unit (P.55) for proper Base Unit settings.
  • Page 59 KX-TG5776S/KX-TG5777S/KX-TGA571S 8.1.6. 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.72) and Test Burst Mode for Base Unit (P.54) for proper Base Unit settings.
  • Page 60 KX-TG5776S/KX-TG5777S/KX-TGA571S 8.1.7. Test Link Mode for Handset Note: (*1) LCD displays the Channel number. (exception: default/ CH00 = 1ch.) (*2) If can not proceed to the next step, refer to Registering a Handset (P.70). (*3) for factory use only. (*4) Refer to Check Table for RF part (P.72) and Test Link Mode for Base Unit (P.56) for proper Base Unit settings.
  • Page 61 KX-TG5776S/KX-TG5777S/KX-TGA571S 8.1.8. Adjustment Mode for Handset Cross Reference (*1) Adjust Battery Low Detector Voltage (Handset) (P.85) Note: (*2) These are the default values. (*3) These values may not be fixed depending on the battery strength.
  • Page 62 KX-TG5776S/KX-TG5777S/KX-TGA571S 8.1.9. LCD Contrast Adjustment for Handset POWER OFF While pressing [ 1 ], [ 9 ] and [ simultaneously, install the battery. 1.5 inch Color LCD LCD/LED Check LCD: Test Pattern is displayed. LED: Three colors are turned on in turn.

  • Page 63: Service Mode

    KX-TG5776S/KX-TG5777S/KX-TGA571S 9 Service Mode 9.1. 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.). This operation should not be performed for a usual repair.

  • Page 64: Troubleshooting Guide

    KX-TG5776S/KX-TG5777S/KX-TGA571S 10 Troubleshooting Guide 10.1. Troubleshooting Flowchart Cross Reference: Note: Check Power (P.65) (*1) When a user claims that the unit disconnects a call right Error Message Table (P.65) after the greeting message and no incoming messages can Check Playback (P.67) be recorded, this symptom can not be reappeared with TEL Check Record (P.66)
  • Page 65 KX-TG5776S/KX-TG5777S/KX-TGA571S 10.1.1. Check Power Cross Reference: Note: Power Supply Circuit (P.14) Flash Memory is IC601. Reset Circuit (P.16) DSP is IC501. (*1) Refer to Specifications (P.6) for part number and supply voltage of AC adaptor. 10.1.2. Error Message Table Display...
  • Page 66 KX-TG5776S/KX-TG5777S/KX-TGA571S 10.1.3. Check Record BASE UNIT A) Not record Greeting Message B) Not record Incoming Message C) How to change the 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.
  • Page 67 KX-TG5776S/KX-TG5777S/KX-TGA571S 10.1.4. Check Playback Cross Reference: Note: Power Supply Circuit (P.14) Flash Memory is IC601. DSP is IC501. 10.1.5. Check Sp-phone Transmission Cross Reference: Note: Signal Route (P.35) Flash Memory is IC601. Telephone Line Interface (P.17) DSP is IC501. 10.1.6. Check Sp-phone Reception...
  • Page 68 KX-TG5776S/KX-TG5777S/KX-TGA571S 10.1.7. Check Battery Charge Note: Flash Memory is IC601. DSP is IC501. (*1) Refer to Specifications (P.6) for part number and supply voltage of AC adaptor.
  • Page 69 KX-TG5776S/KX-TG5777S/KX-TGA571S 10.1.8. Check Link Note: Flash Memory is IC601. DSP is IC501. (*1) Refer to Finding out the Defective part (P.70). Cross Reference: Check the RF part (P.70)
  • Page 70 KX-TG5776S/KX-TG5777S/KX-TGA571S 10.1.9. Check the RF part 10.1.9.1. 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...
  • Page 71 KX-TG5776S/KX-TG5777S/KX-TGA571S 10.1.9.1.2. Deregistering a Handset 10.1.9.2. RF Check Flowchart Each item (1 ~ 6) of RF Check Flowchart corresponds to Check Table for RF part (P.72). Please refer to the each item.
  • Page 72 KX-TG5776S/KX-TG5777S/KX-TGA571S 10.1.9.3. 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 73 KX-TG5776S/KX-TG5777S/KX-TGA571S 10.1.9.4. 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 74 KX-TG5776S/KX-TG5777S/KX-TGA571S 10.1.9.5. RF-DSP Interface Signal Wave Form Test Burst Mode:...
  • Page 75 KX-TG5776S/KX-TG5777S/KX-TGA571S Test Burst Mode:...
  • Page 76 KX-TG5776S/KX-TG5777S/KX-TGA571S 10.1.10. Check Handset Transmission Cross Reference: Signal Route (P.35). 10.1.11. Check Handset Reception Cross Reference: Signal Route (P.35). Note: When checking the RF part, Refer to Check the RF part (P.70) 10.1.12. Check Caller ID Cross Reference: Telephone Line Interface (P.17).

  • Page 77: How To Replace The Flat Package

    KX-TG5776S/KX-TG5777S/KX-TGA571S 10.2. 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 78 KX-TG5776S/KX-TG5777S/KX-TGA571S 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 79: How To Replace The Llp

    KX-TG5776S/KX-TG5777S/KX-TGA571S 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 80 KX-TG5776S/KX-TG5777S/KX-TGA571S 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 81: Disassembly And Assembly Instructions

    KX-TG5776S/KX-TG5777S/KX-TGA571S 11 Disassembly and Assembly Instructions 11.1. Disassembly Instructions 11.1.1. Base Unit Shown in Fig.- To Remove - Remove - Screws (2.6 × 14)..(A) × 5 Cabinet Cover Main P. C. Board Tape, Solders and Cable Main P. C. Board Screws (2.6 ×...
  • Page 82 KX-TG5776S/KX-TG5777S/KX-TGA571S 11.1.2. Handset Shown in Fig.- To Remove - Remove - Screws (2 × 10)..(C) × 2 Cabinet Cover Follow the procedure. Main P. C. Board Tape and Solders Screws (2 × 10)..(D) × 3 Main P. C. Board...
  • Page 83 KX-TG5776S/KX-TG5777S/KX-TGA571S 11.1.3. Charger Unit Shown in Fig.- To Remove - Remove - Screws (2.6 × 10)..(E) × 1 Cabinet Cover Main P.C.Board Main P.C.Board...

  • Page 84: Fix The Lcd And The Receiver Guide To The Main P.c. Board (Handset)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 11.2. Fix the LCD and the Receiver Guide to the Main P.C. Board (Handset)

  • Page 85: Measurements And Adjustments

    KX-TG5776S/KX-TG5777S/KX-TGA571S 12 Measurements and Adjustments 12.1. Things to Do after Replacing IC 12.1.1. X501 (Base Unit), X201 (Handset) Check Equipment: Frequency counter Check Point for measurement: BCK Checking tolerance: 13.824 MHz ± 270 Hz (Base Unit)/13.824 MHz ± 100 Hz (Handset) 12.1.1.1.

  • Page 86: Base Unit Reference Drawing

    KX-TG5776S/KX-TG5777S/KX-TGA571S 12.2. Base Unit Reference Drawing When connecting the Simulator Equipment for checking, please refer to below. FL881 C891 C881 FL891 FL821 R813 FL811 C856 IC300 C857 Q141 Q142 Q161 Q156 PQUP11394Z Note: (*1) is referred to No.3 of Check Table for RF part (P.72)

  • Page 87: Handset Reference Drawing

    KX-TG5776S/KX-TG5777S/KX-TGA571S 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.72)

  • Page 88: Frequency Table

    KX-TG5776S/KX-TG5777S/KX-TGA571S 12.4. Frequency Table 12.4.1. Base Unit Channel TX/RX Frequency (MHz) Channel TX/RX Frequency (MHz) Channel TX/RX Frequency (MHz) 5759.702398 5788.242242 5816.782086 5760.592291 5789.132135 5817.671978 5761.486139 5790.025982 5818.565826 5762.376031 5790.915875 5819.455719 5763.269879 5791.809723 5820.349566 5764.159771 5792.699615 5821.239459 5765.053619 5793.593463 5822.133307 5765.943512...
  • Page 89 KX-TG5776S/KX-TG5777S/KX-TGA571S 12.4.2. Handset Channel TX/RX Frequency (MHz) Channel TX/RX Frequency (MHz) Channel TX/RX Frequency (MHz) 5759.700425 5788.240269 5816.780113 5760.594273 5789.134117 5817.673960 5761.484165 5790.024009 5818.563853 5762.378013 5790.917857 5819.457701 5763.267906 5791.807749 5820.347593 5764.161753 5792.701597 5821.241441 5765.051646 5793.591490 5822.131333 5765.945494 5794.485337 5823.025181 5766.835386 5795.375230...

  • Page 90: Schematic Diagram

    KX-TG5776S/KX-TG5777S/KX-TGA571S 13 Schematic Diagram 13.1. For Schematic Diagram 13.1.1. Base Unit (Schematic Diagram (Base Unit_Main)) 13.1.1.1. Acoustic Testing Mode 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 91 KX-TG5776S/KX-TG5777S/KX-TGA571S Memo...

  • Page 92: Schematic Diagram (Base Unit_Main)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 13.2. Schematic Diagram (Base Unit_Main) ANT0 ANT1 CON_EN CON_EN (VPA) RADIO_EN RADIO_EN RADIO_EN PA_CONT PA_CONT PA_CONT SYN_LE2 SYN_LE2 SYN_LE2 SYN_OUT SYN_OUT SYN_OUT 4.0V SYN_DATA SYN_DATA SYN_DATA SYN_CLK SYN_CLK SYN_CLK SYN_LE1 SYN_LE1 SYN_LE1 TX_DATA TX_DATA TX_DATA RX_GAIN RX_GAIN RX_GAIN RX_EN...
  • Page 93 KX-TG5776S/KX-TG5777S/KX-TGA571S 4.0V 4.0V CONVERTOR IC331 Q300 L300 22uH VOUT VDET *RESET REFERENCE 1XX : TEL LINE 3XX : POWER, CHARGE 4XX : RESET, MIC, SP 5XX : DSP, RF I/F IC300 6XX : FLASH, KEY, LCD 7XX : RF(2.4G) ON/*OFF 8XX : RF(5.8G)

  • Page 94: Schematic Diagram (Base Unit_Rf Part)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 13.3. Schematic Diagram (Base Unit_RF Part) 4.0V 3.0V R863 R864 5.8GHz RF FL891 TRSW_IN VDD_PA 5.8GHz_LPF FL811 5.8GHz_BPF R813 3.0V GND_ISO1 PA_IN C891 ANT1 PA_EN VCC_PA1 SYN_CLK GND_ISO2 IC851 ANTSEL_A GND_ISO3 5.8G_PA ANTSEL_B C881 VCC_PA2 VCC_TXRX 5.8GHz RF ANT2...
  • Page 95 KX-TG5776S/KX-TG5777S/KX-TGA571S L860 PA_CONT CON_EN IC841 IC761 4.0V 3.0V_REG 2.5V_REG C766 C846 RADIO_EN L768 VRF(3.0V) VRF(2.5V) VOUT VOUT SYN_LE2 SYN_OUT SYN_DATA SYN_LE1 SYN_CLK C714 K1000P C707 K1000P 2.5V C751 D10P C708 C1.5P C713 D10P C752 K470P C735 K0.1 R747 C716 C715 TX_DATA 2.4GHz TX...

  • Page 96: Schematic Diagram (Base Unit_Operation)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 13.4. Schematic Diagram (Base Unit_Operation) CN901 CN901 COM1 CN901 COM2 CN901 SEG3 CN901 SEG4 CN901 SEG5 CN901 SEG6 CN901 SEG7 CN901 SEG8 CN901 SEG9 CN901 SEG10 CN901 SEG11 CN901 SEG12 CN901 2APVCC CN901 LED904 MEG_LED CN901 L5DC01 LED907 ANS_LED...
  • Page 97 KX-TG5776S/KX-TG5777S/KX-TGA571S Memo...

  • Page 98: Schematic Diagram (Handset_Main)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 13.5. Schematic Diagram (Handset_Main) OSC_IN RSSI RSSI Q291 R297 150k TX_DATA TX_DATA PA_CONT PA_CONT RX_EN RX_EN TX_EN TX_EN RX_GAIN RX_GAIN RX_DATA RX_DATA CON_EN CON_EN SYN_LE2 SYN_LE2 RADIO_EN SHCTRL SHCTRL R340 C340 K0.1 RF_RESET RF_RESET SYN_DATA SYN_DATA SYN_LE1 SYN_LE1 IC246...
  • Page 99 KX-TG5776S/KX-TG5777S/KX-TGA571S 3.3V TEST SIGNAL FREQUENCY:1kHz R295 1.5k R291 SP phone RX (MIC Mute: ON) L291 CN291 L293 1.8Vp-p/8 (Vol.MAX) IC291 R292 VOUT L327 470nH VBUS ON/OFF L292 3.3V L326 470nH 2.7 or 3.1V Headset TX -37dBm/600 R331 50mVp-p HEADSET_JACK R227...

  • Page 100: Schematic Diagram (Handset_Rf Part)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 13.6. Schematic Diagram (Handset_RF Part) 3.1V R863 R864 2.8V 5.8GHz TX TRSW_IN VDD_PA FL811 5.8GHz RF 5.8GHz_BPF R813 GND_ISO1 PA_IN C891 ANT1 PA_EN VCC_PA1 SYN_CLK GND_ISO2 ANTSEL_A IC851 5.8G_PA GND_ISO3 ANTSEL_B VCC_PA2 VCC_TXRX C881 ANT2 LNA_EN 2G4_IN GND_ISO4 LNA_GAIN...
  • Page 101 KX-TG5776S/KX-TG5777S/KX-TGA571S L860 PA_CONT CON_EN IC841 IC761 3.1V 2.8V_REG 2.5V_REG C766 C846 ON/OFF RADIO_EN L768 VRF(2.8V) VRF(2.5V) VOUT VOUT SYN_LE2 SYN_OUT SYN_DATA 2.5V SYN_LE1 SYN_CLK C714 K1000P C707 K1000P C751 D10P C713 D10P C708 C1.5P C752 K470P C735 K0.1 R747 C716...

  • Page 102: Schematic Diagram (Charger Unit)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 13.7. Schematic Diagram (Charger Unit) 6.5~11V NC: No Components SCHEMATIC DIAGRAM (Charger Unit)

  • Page 103: Printed Circuit Board

    KX-TG5776S/KX-TG5777S/KX-TGA571S 14 Printed Circuit Board 14.1. Circuit Board (Base Unit_Main) 14.1.1. Component View C891 FL881 C881 FL891 FL821 R813 FL811 C856 IC300 C857 Q141 Q142 Q161 Q156 PQUP11394Z...
  • Page 104 KX-TG5776S/KX-TG5777S/KX-TGA571S 14.1.2. Flow Solder Side View DCM2 DCP2 5761 5766 5771 5776 URX2 UTX2 BCLK PQUP11394Z DVCC JC JS CHARGE- KIN3 KIN4 CHARGE+...

  • Page 105: Circuit Board (Base Unit_Rf Part)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 14.2. Circuit Board (Base Unit_RF Part) C891 FL881 C881 FL891 FL821 R813 FL811 C856 C857...
  • Page 106 KX-TG5776S/KX-TG5777S/KX-TGA571S Memo...

  • Page 107: Circuit Board (Base Unit_Operation)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 14.3. Circuit Board (Base Unit_Operation) 14.3.1. Component View...
  • Page 108 KX-TG5776S/KX-TG5777S/KX-TGA571S 14.3.2. Flow Solder Side View...

  • Page 109: Circuit Board (Handset_Main)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 14.4. Circuit Board (Handset_Main) 14.4.1. Component View...
  • Page 110 KX-TG5776S/KX-TG5777S/KX-TGA571S 14.4.2. Flow Solder Side View...

  • Page 111: Circuit Board (Handset_Rf Part)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 14.5. Circuit Board (Handset_RF Part)

  • Page 112: Circuit Board (Charger Unit)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 14.6. Circuit Board (Charger Unit) 14.6.1. Component View PQLV30043 KX-TG57 PQUP11398Z WHITE CIRCUIT BOARD (Charger Unit (Component View)) 14.6.2. Flow Solder Side View PQUP11398Z KX-TG57 PQLV30043 CIRCUIT BOARD (Charger Unit (Flow Solder Side View))

  • Page 113: Appendix Information Of Schematic Diagram

    KX-TG5776S/KX-TG5777S/KX-TGA571S 15 Appendix Information of Schematic Diagram 15.1. CPU Data (Base Unit) 15.1.1. IC501 Description High High_Z KEY_IN6 Key In Description High High_Z KEY_IN5 Key In GNDPA KEY_IN4 Key In SPOUTP KEY_IN3 Key In BCLK KEY_IN2 Key In TXMOD KEY_IN1...

  • Page 114: Cpu Data (Handset)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 15.2. CPU Data (Handset) 15.2.1. IC201 Description High High_Z 63 STB_D Active Description High High_Z 64 STB_C Active 1 SPOUTP 65 STB_B Active 2 BCLK 66 STB_A Active 3 NC 67 GND 4 RSSI 68 VCC 5 XIN 69 TCK...

  • Page 115: Explanation Of Ic Terminals (Rf Part)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 15.3. Explanation of IC Terminals (RF Part) 15.3.1. IC701...
  • Page 116 KX-TG5776S/KX-TG5777S/KX-TGA571S 15.3.2. IC801 Backside Terminal: GND...
  • Page 117 KX-TG5776S/KX-TG5777S/KX-TGA571S 15.3.3. IC851 Backside Terminal: GND...

  • Page 118: Terminal Guide Of The Ics, Transistors And Diodes

    KX-TG5776S/KX-TG5777S/KX-TGA571S 15.4. Terminal Guide of the ICs, Transistors and Diodes 15.4.1. Base Unit 15.4.2. Handset...

  • Page 119: Exploded View And Replacement Parts List

    KX-TG5776S/KX-TG5777S/KX-TGA571S 16 Exploded View and Replacement Parts List 16.1. Cabinet and Electrical Parts (Base Unit) Note: (*1) for KX-TG5776...

  • Page 120: Cabinet And Electrical Parts (Handset)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 16.2. Cabinet and Electrical Parts (Handset) Note: (*1) Stick the magnetic shield (No. 120) to the exact location described above. (*2) Attach the spacer (No. 124) to the exact location described above.

  • Page 121: Cabinet And Electrical Parts (Charger Unit)

    KX-TG5776S/KX-TG5777S/KX-TGA571S 16.3. Cabinet and Electrical Parts (Charger Unit)

  • Page 122: Accessories And Packing Materials

    KX-TG5776S/KX-TG5777S/KX-TGA571S 16.4. Accessories and Packing Materials 16.4.1. KX-TG5776S 16.4.2. KX-TG5777S...
  • Page 123 KX-TG5776S/KX-TG5777S/KX-TGA571S 16.4.3. KX-TGA571S...

  • Page 124: Replacement Parts List

    D362 B0ECKM000008 DIODE(SI) PQQT23130Z LABEL, URL D472 MAZ805100L DIODE(SI) PQQT23193Z LABEL, CHARGE D473 MAZ805100L DIODE(SI) PQKM10717Z1 CABINET BODY (for KX-TG5776S) PS-HB (COILS) PQKM10717M1 CABINET BODY (for KX-TG5777S) PS-HB L101 PQLQXF330K COIL PFSA1049Z ANTENNA (R) L102 PQLQXF330K COIL PFSA1050Z ANTENNA (L)
  • Page 125 KX-TG5776S/KX-TG5777S/KX-TGA571S Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks L871 MQLRF3N3DFB COIL R677 ERJ2GEJ221 C723 MQLRF2N7DFB COIL R679 ERJ2GEJ821 (JACKS AND CONNECTOR) R681 ERJ2GEJ561 CN101 K2LB102B0053 JACK R683 ERJ2GEJ821 CN301 K2ECYB000001 JACK...
  • Page 126 KX-TG5776S/KX-TG5777S/KX-TGA571S Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C518 ECST0JY106 C842 ECUV1A105KBV C521 ECJ0EB1A104K C843 ECUV1A474KBV 0.47 C531 ECUV1C104KBV C844 ECJ0EC1H020C C601 ECJ0EB1A104K C856 ECJ0EC1H020C C660 ECUV1C104KBV C857 ECJ0EB0J105K C663 ECJ0EB1H102K 0.001...
  • Page 127 KX-TG5776S/KX-TG5777S/KX-TGA571S 16.5.2.2. Main P.C. Board Parts Ref. Part No. Part Name & Description Remarks Note: FL821 KNCFH165R8Z1 LCR FILTER (*1) When you have replaced IC201 or IC241, adjust X201. FL881 J0E5797B0002 LCR FILTER Refer to Check and Adjust X201 (Handset) Frequency (COMPONENTS PARTS) (P.85) and Adjust Battery Low Detector Voltage (Hand-...
  • Page 128 KX-TG5776S/KX-TG5777S/KX-TGA571S Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R834 ERJ2GEJ332 3.3K C746 ECJ0EC1H101J 100P R864 ERJ2GEJ102 C747 ECJ0EC1H100D R865 ERJ2GEJ391 C748 ECJ0EC1H101J 100P (CAPACITORS) C749 ECJ0EC1H101J 100P C201 ECJ0EC1H060D C750 ECJ0EC1H101J...
  • Page 129 16.5.4. Accessories and Packing Materials P204 PQXDDS400-8 PHOTO ELECTRIC TRANSDUCER, SECURITY TAG Note: (*1) You can download and refer to the Operating Instructions (Instruction book) on TSN Server. 16.5.4.1. KX-TG5776S Ref. Part No. Part Name & Description Remarks PQLV207Z AC ADAPTOR PQJA10075Z...

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