Panasonic KX-TG8021BXS Service Manual
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Panasonic KX-TG8021BXS Service Manual

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Telephone Equipment
KX-TG8021BXS
Model No.
KX-TG8021BXT
KX-TGA800BXS
KX-TGA800BXT
Digital Cordless Answering System
S: Silver Version
T: Titanium Black Version
(for Middle Near East and Africa)
© Panasonic Communications Co., Ltd. 2008. Unau-
thorized copying and distribution is a violation of law.
ORDER NO. KM40810745CE

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Summary of Contents for Panasonic KX-TG8021BXS

  • Page 1 Telephone Equipment KX-TG8021BXS Model No. KX-TG8021BXT KX-TGA800BXS KX-TGA800BXT Digital Cordless Answering System S: Silver Version T: Titanium Black Version (for Middle Near East and Africa) © Panasonic Communications Co., Ltd. 2008. Unau- thorized copying and distribution is a violation of law.
  • Page 2 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT...

  • Page 3: Table Of Contents

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT TABLE OF CONTENTS PAGE PAGE 1 Safety Precautions----------------------------------------------- 4 13.2. Schematic Diagram (Base Unit_Main)-------------- 78 1.1. For Service Technicians --------------------------------- 4 13.3. Schematic Diagram (Base Unit_Operation) ------- 80 2 Warning -------------------------------------------------------------- 4 13.4. Schematic Diagram (Handset)------------------------ 82 2.1. Battery Caution--------------------------------------------- 4 13.5.

  • Page 4: Safety Precautions

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 1 Safety Precautions 1.1. For Service Technicians • Repair service shall be provided in accordance with repair technology information such as service manual so as to pre- vent fires, injury or electric shock, which can be caused by improper repair work.

  • Page 5: Discarding Of P.c. Board

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 2.2.1. Suggested PbF Solder There are several types of PbF solder available commercially. While this product is manufactured using Tin, Silver, and Copper (Sn+Ag+Cu), you can also use Tin and Copper (Sn+Cu) or Tin, Zinc, and Bismuth (Sn+Zn+Bi). Please check the manufacturer’s specific instructions for the melting points of their products and any precautions for using their product with other materials.

  • Page 6: Specifications

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 3 Specifications Note: • Design and specifications are subject to change without notice. Note for Service: • Operation range: Up to 300 m outdoors, Up to 50 m indoors, depending on the condition. • Analog telephone connection: Telephone Line...

  • Page 7: Technical Descriptions

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 4 Technical Descriptions 4.1. Block Diagram (Base Unit)

  • Page 8: Circuit Operation (Base Unit)

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 4.2. Circuit Operation (Base Unit) 4.2.1. Outline Base Unit consists of the following ICs as shown in Block Diagram (Base Unit) (P.7). • DECT BBIC (Base Band IC): IC7 - Handling all the audio, signal and data processing needed in a DECT base unit...
  • Page 9 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 4.2.2. Power Supply Circuit The power is supplied to the DECT BBIC, RF Module, EEPROM and Charge Contact from AC Adaptor (+6.5 V) as shown in Fig.101. The power supply is as follows; • DECT BBIC (IC7): DC Jack (+6.5 V) → IC1 → Q9 → IC7 DC Jack (+6.5 V) →...
  • Page 10 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 4.2.3. Telephone Line Interface <Function> • Bell signal detection • Clip signal detection • ON/OFF hook circuit Bell & Clip (: Calling Line Identification Presentation: Caller ID) signal detection: In the standby mode, Q3 is open to cut the DC loop current and decrease the ring load.

  • Page 11: Block Diagram (Handset)

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 4.3. Block Diagram (Handset)

  • Page 12: Circuit Operation (Handset)

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 4.4. Circuit Operation (Handset) 4.4.1. Outline Handset consists of the following ICs as shown in Block Diagram (Handset) (P.11). • DECT BBIC (Base Band IC): IC1 - All data signals (forming/analyzing ACK or CMD signal) - All interfaces (ex: Key, Detector Circuit, Charge, DC/DC Converter, EEPROM, LCD, RF Power Amp.)

  • Page 13: Circuit Operation (Charger Unit)

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 4.5. Circuit Operation (Charger Unit) 4.5.1. Power Supply Circuit The power supply is as shown.

  • Page 14: Signal Route

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 4.6. Signal Route...
  • Page 15 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT...

  • Page 16: Location Of Controls And Components

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 5 Location of Controls and 5.1.2. Handset Components 5.1. Controls 5.1.1. Base Unit...

  • Page 17: Installation Instructions

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 6 Installation Instructions 6.2. Battery 6.2.1. Battery Installation and Replace- 6.1. Connections ment See For Service Hint (P.25)
  • Page 18 In that case, by recharging the battery as mentioned above, you will get a correct indication of the battery strength. 6.2.3. Battery Level 6.2.4. Panasonic Ni-MH Battery Performance (supplied batteries)

  • Page 19: Operating Instructions

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 7 Operating Instructions 7.1. Programmable Settings...

  • Page 20: Registering A Handset To A Base Unit

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT *1 The item will not be reset when pressing key of the handset. Refer to How to Clear User Setting (P.32). *2 The item will not be reset when pressing keys. Refer to How to Clear User Setting (P.32).

  • Page 21: Copying Phonebook Entries

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 7.2.1. Deregistering a Handset 7.3. Copying Phonebook Entries You can copy phonebook entries to the phonebook of another compatible Panasonic handset. Note: Category settings for phonebook entries are not copied. 7.3.1. Copying All Entries 7.4. Dialling Mode...

  • Page 22: Error Messages

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 7.5. Error Messages...

  • Page 23: Troubleshooting

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 7.6. Troubleshooting...
  • Page 24 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT...

  • Page 25: For Service Hint

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 7.7. For Service Hint Cross Reference: Battery Charge (P.18)

  • Page 26: Service Mode

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 8 Service Mode 8.1. Engineering Mode 8.1.1. Base Unit...
  • Page 27 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Frequently Used Items (Base Unit) ex.) Items Address Default Data New Data Remarks C-ID (FSK) sensitivity 04 D6 01 (6 dB up) 02 (12 dB up) When hex changes from “00” to “01” or “02”, gain increases by 6 dB or 12 dB.
  • Page 28 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 8.1.2. Handset...
  • Page 29 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Frequently Used Items (Handset) ex.) Items Address Default Data New Data Possible Adjusted Possible Adjusted Remarks Value MAX (hex) Value MIN (hex) Sending level 00 06 Adjusted value Given value (*2) Receiving level 00 07 Adjust value Given value...

  • Page 30: Copying Phonebook Items When Repairing

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 8.2. Copying Phonebook Items when Repairing You can copy the handset phonebook to another (compatible Panasonic) handset. This will help to save the original phonebook data which the customer has registered. Available models: KX-TG8011/8012/8021 Refer to the following procedures.
  • Page 31 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Note: • BS=Base Unit , HS=Handset • If the max number of handsets are already registered to the base unit, a new handset cannot be registered. • To register the handset, refer to Registering a Handset to a Base Unit (P.20) •...

  • Page 32: How To Clear User Setting

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 8.3. How to Clear User Setting Units are reset to the Factory settings by this operation (Erase recorded Voice messages*, stored Phone numbers, Caller list and etc.) Note: • Some menus are not reset. Refer to Operating Instructions (P.19).

  • Page 33: Troubleshooting Guide

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 9 Troubleshooting Guide 9.1. Troubleshooting Flowchart Flow Chart Cross Reference: Check Power (P.34) Bell Reception (P.44) Check Battery Charge (P.35) Check Link (P.36) Check the RF part (P.40) Check Handset Transmission (P.43) Check Handset Reception (P.43) Signal Route (P.14) Check Caller ID (P.43)
  • Page 34 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 9.1.1. Check Power 9.1.1.1. Base Unit Is the AC Adaptor inserted into AC outlet? (*1) Cross Reference: Note: Power Supply Circuit (P.9) (*1) Refer to Specifications (P.6) for part number and supply voltage of AC Adaptor. 9.1.1.2. Handset Cross Reference:...
  • Page 35 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 9.1.2. Check Battery Charge 9.1.2.1. Base Unit Cross Reference: Charge Circuit (P.12) 9.1.2.2. Handset Cross Reference: Check Power (P.34) Charge Circuit (P.12) 9.1.2.3. Charger Unit Cross Reference: Charge Circuit (P.12)
  • Page 36 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 9.1.3. Check Link 9.1.3.1. Base Unit Note: (*1) Refer to Troubleshooting by Symptom (Base Unit and Charger Unit) (P.45) Cross Reference: Check Point (Base Unit) (P.45) Power Supply Circuit (P.9)
  • Page 37 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Cross Reference: Check Point (Base Unit) (P.45)
  • Page 38 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 9.1.3.2. Handset Note: (*1) Refer to Troubleshooting by Symptom (Handset) (P.49) Cross Reference: Check Point (Handset) (P.49) Power Supply Circuit/Reset Circuit (P.12)
  • Page 39 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Cross Reference: Check Point (Handset) (P.49)
  • Page 40 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 9.1.4. Check the RF part 9.1.4.1. Finding out the Defective part After All the Checkings or Repairing 1. Re-register the checked Handset to the checked Base Unit, and Regular HS to Regular BU. Note: If you need to register a handset, refer to Registering a Handset to a Base Unit (P.20)
  • Page 41 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 9.1.4.2. RF Check Flowchart Each item (1 ~ 3) of RF Check Flowchart corresponds to Check Table for RF part (P.42). Please refer to the each item. Note: (*1) Base unit - refer to (G) of Check Point (Base Unit) (P.45)
  • Page 42 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 9.1.4.3. Check Table for RF part Item BU (Base Unit) Check HS (Handset) Check Link Confirmation Normal 1. Register Regular HS to BU (to be 1. Register HS (to be checked) to Regular checked). HS, BU Mode: [Normal mode] 2.
  • Page 43 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 9.1.5. Check Handset Transmission Cross Reference: Signal Route (P.14) 9.1.6. Check Handset Reception Cross Reference: How to Check the Handset Speaker or Receiver (P.68). Signal Route (P.14) 9.1.7. Check Caller ID Cross Reference: Signal Route (P.14)
  • Page 44 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 9.1.8. Bell Reception 9.1.8.1. Base Unit 9.1.8.2. Handset Cross Reference: Telephone Line Interface (P.10) Check Link (P.36) How to Check the Handset Speaker or Receiver (P.68) 9.1.9. Check TAM Operation Cross Reference: Power Supply Circuit (P.9) Note: (*1) When replacing FLASH MEMORY (IC421), TAM data need to be written to it. Refer to Base Unit of Things to Do after...

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

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 9.2. Troubleshooting by Symptom (Base Unit and Charger Unit) If your unit has below symptoms, follow the instructions in remedy column. Remedies depend on whether you have DECT tester (*1) or not. Note: (*1) A general repair is possible even if you don’t have the DECT tester because it is for confirming the levels, such as Acoustic level in detail.
  • Page 46 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Items Check Procedure Check or Point Replace Parts (G)* BBIC Clock Adjustment 1. Input Command “ sendchar WWD ff 48 IC 8006” X1, IC7, R430, VDD4 2. Confirm that the voltage between testpoint VDD4 and GND is less than 1.0 V.
  • Page 47 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Items Check Procedure Check or Point Replace Parts (M)* Frequency Drift Confir- Follow steps 1 to 6 of (J). IC7, L7, C117, mation ANTI_TP 7.Confirm that the frequency drift is < ± 20 kHz/ms. C118, C124, C125, R106, R109,DA1,...
  • Page 48 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Items Check Procedure Check or Point Replace Parts Audio Check 1. Link with Handset. IC7, SA1, L1, 2. Input -45 dBm/1kHz to MIC of Handset. L2, D3, Q3, Q4, Measure the Level at Line I/F and distortion level. R14, R15, R16, 3.

  • Page 49: Troubleshooting By Symptom (Handset)

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 9.3. Troubleshooting by Symptom (Handset) If your unit has below symptoms, follow the instructions in remedy column. Remedies depend on whether you have DECT tester (*1) or not. Note: (*1) A general repair is possible even if you don’t have the DECT tester because it is for confirming the levels, such as Acoustic level in detail.
  • Page 50 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Items Check Procedure Check or Point Replace Parts (F)* Battery Monitor Check 1. Apply 2.25 V between BATT+ and BATT-. IC1, F1, C1, 2. Execute the command sendchar PAD sendchar LED 0 sendchar AD1 It assumes that the return value is XX.
  • Page 51 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Items Check Procedure Check or Point Replace Parts (K)* Frequency Offset Confir- Follow steps 1 to 3 of (I). IC1, mation 4.Confirm that the frequency Offset is < ± 20 kHz. R801~R806, C808~C814, C819, C825, C834, IC801, L802~L804, D801, R807,...
  • Page 52 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Items Check Procedure Check or Point Replace Parts (O) Audio Check and Confir- 1. Link to BASE which is connected to Line Simulator. IC1, R23, C12, mation 2. Set line voltage to 48 V and line current to 40 mA.

  • Page 53: Disassembly And Assembly Instructions

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 10 Disassembly and Assembly Instructions 10.1. Disassembly Instructions 10.1.1. Base Unit...
  • Page 54 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT...
  • Page 55 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 10.1.2. Handset...
  • Page 56 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 10.1.3. Charger Unit...

  • Page 57: How To Replace The Handset Lcd

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 10.2. How to Replace the Handset LCD...

  • Page 58: Measurements And Adjustments

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 11 Measurements and Adjustments 11.1. The Setting Method of JIG (Base Unit) 11.1.1. Preparation 11.1.1.1. Equipment Required • DECT tester: Rohde & Schwarz, CMD 60 is recommended. • Frequency counter: It must be precise enough to measure intervals of 1 Hz (precision; ±4 ppm).
  • Page 59 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 11.1.2.2. Batch file Setting Note: • “****” varies depending on the country. 11.1.2.3. Commands See the table below for frequently used commands. Command name Function Example rdeeprom Read the data of EEPROM Type “rdeeprom 00 00 FF”, and the data from address “00 00”...

  • Page 60: Adjustment Standard (Base Unit)

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 11.2. Adjustment Standard (Base Unit) When connecting the simulator equipments for checking, please refer to below. 11.2.1. Bottom View Note: (A) - (S) is referred to Check Point (Base Unit) (P.45)

  • Page 61: Adjustment Standard (Charger Unit)

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 11.3. Adjustment Standard (Charger Unit) When connecting the simulator equipment for checking, please refer to below. 11.3.1. Bottom View Digital Volt Meter /2 W DC POWER DC 6.5 V Note: (A) is referred to Check Point (Charger Unit) (P.48)

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

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 11.4. The Setting Method of JIG (Handset) 11.4.1. Preparation 11.4.1.1. Equipment Required • DECT tester: Rohde & Schwarz, CMD 60 is recommended. • Frequency counter: It must be precise enough to measure intervals of 1 Hz (precision; ±4 ppm).
  • Page 63 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 11.4.2.2. Batch file Setting Note: • “*****” varies depending on the country. 11.4.2.3. Commands See the table below for frequently used commands. Command name Function Example rdeeprom Read the data of EEPROM Type “rdeeprom 00 00 FF”, and the data from address “00 00”...

  • Page 64: Adjustment Standard (Handset)

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 11.5. Adjustment Standard (Handset) When connecting the simulator equipments for checking, please refer to below. 11.5.1. Component View Note: (A) - (Q) is referred to Check Point (Handset) (P.49)

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

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 11.6. Things to Do after Replacing IC or X'tal Cautions: Some of the content on this page may not apply to models from some countries. 11.6.1. Base Unit Before making the following adjustment, ensure you have carried out PC Setting (P.58) in The Setting Method of JIG (Base Unit).
  • Page 66 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 11.6.2. Handset Before making the following adjustment, ensure you have carried out PC Setting (P.62) in The Setting Method of JIG (Hand- set). Items Necessary Adjustment BBIC (FLASH type) Programs for Voice processing, interface for RF 1. Make sure to connect the JIG cable, then detach the DC...

  • Page 67: Rf Specification

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 11.7. RF Specification 11.7.1. Base Unit Item Value Refer to -. * TX Power 19 dBm ~ 25 dBm Check Point (Base Unit) (J) Modulation -370±30/+370±30 kHz/div & Modulated Check Point (Base Unit) (K) width 690 kHz Frequency Offset...

  • Page 68: How To Check The Handset Speaker Or Receiver

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 11.8. How to Check the Handset Speaker or Receiver 1. Prepare the digital voltmeter, and set the selector knob to ohm meter. 2. Put the probes at the speaker terminals as shown below. 11.9. Frequency Table (MHz) BASE UNIT...

  • Page 69: Miscellaneous

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 12 Miscellaneous 12.1. CPU Data (Base Unit) 12.1.1. IC7 (BBIC) Pin No. Description Connection at Normal mode at Reset mode VSS_LNA1 RF_RXp RF_RXp RF_RXn RF_RXn VSS_LNA2 RFP1 RXON O_0/1 Hi-Z RFP0 ANT1 O_0/1 Hi-Z REF_RES REF_RES AVS_XTAL XTAL2 XTAL2...
  • Page 70 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Pin No. Description Connection at Normal mode at Reset mode P0_1/URX I_0/1 I-PU P0_0/UTX O_0/1 I-PU RSTn RSTn O_0/1 I-PU JTAG D.I/O JTAG I/O_0/1 I-PU P2_5/PCM_FSC/SF EEP_WP O_0/1 I-PU P2_4/SCL1/PCM_DO/ N.C. I-PU P2_3/SDA1/PCM_DI/DP2 N.C. I-PU P2_2/PCM_CLK/CLK100 N.C. I-PU P2_1/ECZ2/PWM1/LED4...

  • Page 71: Cpu Data (Handset)

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 12.2. CPU Data (Handset) 12.2.1. IC1 (BBIC) Pin No. Description Connection at Normal mode at Reset mode VSS_LNA1 RF_RXp RF_RXp RF_RXn RF_RXn VSS_LNA2 RFP1 RXON O_0/1 Hi-Z RFP0 ANT1 O_0/1 Hi-Z REF_RES REF_RES AVS_XTAL XTAL2 XTAL2 XTAL1 XTAL1 AVD_XTAL...
  • Page 72 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Pin No. Description Connection at Normal mode at Reset mode JTAG D.I/O JTAG I/O_0/1 I-PU P2_5/PCM_FSC/SF LCD_CSB O_0/1 I-PU P2_4/SCL1/PCM_DO/ N.C. I-PU P2_3/SDA1/PCM_DI/DP2 LCD_BACKLIT(NC) I-PU P2_2/PCM_CLK/CLK100 LCD_RESET O_0/1 I-PU P2_1/ECZ2/PWM1/LED4 N.C. P2_0/ECZ1/PWM0/LED3 BELL_LED_A VDD2 +1.8V LDORF_CTRL N.C. RF_SUPPLY2 RF_SUPPLY2...

  • Page 73: How To Replace The Flat Package

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 12.3. How to Replace the Flat Package IC Even if you do not have the special tools (for example, a spot heater) to remove the Flat IC, with some solder (large amount), a soldering iron and a cutter knife, you can easily remove the ICs that have more than 100 pins.
  • Page 74 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 12.3.3. How to Install the IC 1. Temporarily fix the FLAT PACKAGE IC, soldering the two marked pins. *Check the accuracy of the IC setting with the corresponding soldering foil. 2. Apply flux to all pins of the FLAT PACKAGE IC.

  • Page 75: Terminal Guide Of The Ics, Transistors And Diodes

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 12.4. Terminal Guide of the ICs, Transistors and Diodes 12.4.1. Base Unit 12.4.2. Handset 12.4.3. Charger Unit...

  • Page 76: Schematic Diagram

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 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 77 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Memo...

  • Page 78: Schematic Diagram (Base Unit_Main)

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 13.2. Schematic Diagram (Base Unit_Main) ANT1_TP ANT2_TP ANT_2 ANT_1 Beep Bell signal *R86 C122 *R87 To RF output R807 RXON GND_C C826 1.5p RX _RF C832 RF_RXn To ANT C833 C803 C616 RF_RXp 2.5V 1.3p C801 VDD5 +2.5_CP +3.0V...
  • Page 79 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Loop Current LINE_DC *R30 100k (1005) C155 6.8k *R13 TP10 *R20 R116 3.9k 2.2k *R12 100k 5.6M +1.8V +1.8V 100k GND GND Caller ID 5.6M Bell signal RX_AF R100 K1000p 180k *R82 *R83 1.5n *C147 TX _AF 180k K1000p *C148 1.5n...

  • Page 80: Schematic Diagram (Base Unit_Operation)

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 13.3. Schematic Diagram (Base Unit_Operation) ANSWER ON PLAY CN10-9 CN10-8 CN10-10 CN10-5 CN10-4 CN10-2 CN10-7 SKIP REPEAT ERASE CN10-1 CN10-3 ANS_ON VOL_UP STOP CN10-6 VOL_DOWN PLAY LOCATOR PLAY2 KX-TG8021 SCHEMATIC DIAGRAM (Base Unit_Operation)
  • Page 81 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Memo...

  • Page 82: Schematic Diagram (Handset)

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 13.4. Schematic Diagram (Handset) Charge Current BATTERY BATTERY BATT+ 5.6n 1.8V (MAX500mA) 330u +1.8V 330u 1.8V BATT- X_CLK 2.5V 4.0V CP+4.0V CP+2.5V 3.9k CHG(+) k0.1u POWER +1.8V CHG(-) GND_0 GND_1 K0.1u RSTn VBAT2 +1.8V JTAG CP_C1y LCD_CSB P2_5/PCM_FSC/SF CP_C2x...
  • Page 83 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT R107 ANT_TP ANT1 R108 ANT2 R807 RXON C822 100p C827 L801 RX_RF C826 B1.5p D802 C803 RF_RXn C837 B0.5p 1.3p C832 ANT2 RF_RXp C833 CP+2.5V R806 TXON C172 BATTERY C825 0.1u VDD_PADRV R805 C812 R801 C808 100n C811 PSET...

  • Page 84: Schematic Diagram (Charger Unit)

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 13.5. Schematic Diagram (Charger Unit) R1 10 SCHEMATIC DIAGRAM (Charger Unit)

  • Page 85: Printed Circuit Board

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 14 Printed Circuit Board 14.1. Circuit Board (Base Unit_Main) 14.1.1. Component View R38 R39 R654 C501 R653 C163 R542 C147 R532 C148 C306 C141 C166 KX-TG8021 CIRCUIT BOARD (Base Unit (Component View))
  • Page 86 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 14.1.2. Bottom View KX-TG8021 CIRCUIT BOARD (Base Unit (Bottom View))

  • Page 87: Circuit Board (Base Unit_Operation)

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 14.2. Circuit Board (Base Unit_Operation) 14.2.1. Component View PQUP11539Z KX-TG7321 TG8021 CN10 KX-TG8021 CIRCUIT BOARD (Base Unit_Operation (Component View))
  • Page 88 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 14.2.2. Bottom View PQUP11539Z KX-TG7321 TG8021 LED2 VOL_UP ANS_ON ERASE PLAY REPEAT SKIP LED1 STOP LOCATOR VOL_DOWN CN10 KX-TG8021 CIRCUIT BOARD (Base Unit_Operation (Bottom View))

  • Page 89: Circuit Board (Handset)

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 14.3. Circuit Board (Handset) 14.3.1. Component View ANT1 SOLDER C811 R804 R803 C804 C814 C117 C813 C183 C802 L802 C182 C808 L801 R801 C827 R805 ANT_TP JTAG C837 C834 C46 C45 C44 C187 C186 C832 R807 R203 R206 1.8V...
  • Page 90 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 14.3.2. Bottom View PNLB1040Z KX-TGA800EX C114 C103 SOFT_A SOFT_B TALK LED8 LED5 LEFT RIGHT CANCEL DOWN KX-TGA800 CIRCUIT BOARD (Handset_Main (Bottom View))

  • Page 91: Circuit Board (Charger Unit)

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 14.4. Circuit Board (Charger Unit) 14.4.1. Component View CIRCUIT BOARD (Charger unit (Component View)) 14.4.2. Bottom View TP4 (GND) CIRCUIT BOARD (Charger unit (Bottom View))

  • Page 92: Exploded View And Replacement Parts List

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 15 Exploded View and Replacement Parts List 15.1. Cabinet and Electrical Parts (Base Unit)

  • Page 93: Cabinet And Electrical Parts (Handset)

    (*1) This cable is fixed by welding. Refer to How to Replace the Handset LCD (P.57). (*2) The rechargeable Ni-MH battery HHR-4MPT is available through sales route of Panasonic. (*3) Attach the spacer (No. 121) to the exact location described above.

  • Page 94: Cabinet And Electrical Parts (Charger Unit)

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 15.3. Cabinet and Electrical Parts (Charger Unit)

  • Page 95: Accessories And Packing Materials

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 15.4. Accessories and Packing Materials 15.4.1. KX-TG8021BXS/BXT...
  • Page 96 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 15.4.2. KX-TGA800BXS/BXT...

  • Page 97: Replacement Part List

    KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT 15.5. Replacement Part List Safety Ref. Part No. Part Name & Description Remarks 1. RTL (Retention Time Limited) PQJJ1T039Y JACK, MODULAR Note: PNBC1002Y3 BUTTON, NAVIGATOR ABS-HB The “RTL” marking indicates that its Retention Time is PNHR1001Z GUIDE, BUTTON PS-HB...
  • Page 98 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks ERJ3GEYJ184 180k R804 ERJ2GEJ102 ERJ3GEYJ105 R805 ERJ2GEJ470 ERJ3GEYJ184 180k R806 ERJ2GEJ221 ERJ3GEYJ105 R807 ERJ2GEJ221 ERJ3GEYJ565 5.6M (CAPACITORS) ERJ3GEYJ104 100k F1K2H152A008 1.5n ERJ3GEYJ565 5.6M...
  • Page 99 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks C810 F1G1H1R6A480 1.6p PNKK1001Z6 LID, BATTERY (KX- ABS-HB TGA800BXS) C811 ECUE1H100DCQ 10p PNKK1001Z2 LID, BATTERY (KX- ABS-HB C812 F1G1H7R0A480 7p TGA800BXT) C813 F1G1H1R6A480 1.6p...
  • Page 100 KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks (CONNECTOR) ECUV1A105KBV 1 K1MY20BA0112 CONNECTOR PQCUV0J106KB 10 (RESISTORS) PQCUV0J106KB 10 ERJ2GEJ392 3.9k ECUE1H100DCQ 10p ERJ2GEJ102 ECUE1H100DCQ 10p ERJ2GEJ122 1.2k ECUE1H101JCQ 100p...
  • Page 101 ERG2SJ100E (FUSE) K5H302Y00003 FUSE 15.5.4. Accessories and Packing Materials Note: (*1) You can download and refer to the Operating Instruc- tions (Instruction book) on TSN Server. 15.5.4.1. KX-TG8021BXS/BXT Safety Ref. Part No. Part Name & Description Remarks PQLV207BXU AC ADAPTOR...

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