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Telephone Equipment
KX-TG2448BXF
KX-TG2448BXS
KX-TGA254BXF
KX-TGA254BXS
2.4 GHz Digital Cordless Phone
Blue Version
Silver Version
(for Asia, Middle Near East and Other areas)
© 2005 Panasonic Communications Co., Ltd. All
rights
reserved.
distribution is a violation of law.
ORDER NO. KM40512964CE
Unauthorized
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Table of Contents
Troubleshooting
Related Manuals for Panasonic KX-TG2448BXF
Summary of Contents for Panasonic KX-TG2448BXF
- Page 1 Telephone Equipment KX-TG2448BXF KX-TG2448BXS KX-TGA254BXF KX-TGA254BXS 2.4 GHz Digital Cordless Phone Blue Version Silver Version (for Asia, Middle Near East and Other areas) © 2005 Panasonic Communications Co., Ltd. All rights reserved. Unauthorized copying distribution is a violation of law.
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Page 2: Table Of Contents
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS Note: Because CONTENTS 4 is the extract from the Operating Instructions of this model, it is subject to change without notice. You can download and refer to the original Operating Instructions on TSN Server for further information. - Page 3 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 23 CABINET AND ELECTRICAL PARTS (HANDSET) 28 SCHEMATIC DIAGRAM (BASE UNIT_MAIN) 24 ACCESSORIES AND PACKING MATERIALS 29 SCHEMATIC DIAGRAM (BASE UNIT_RF PART) 24.1. KX-TG2448BXF/BXS 30 SCHEMATIC DIAGRAM (BASE UNIT_OPERATION) 25 TERMINAL GUIDE OF THE ICs, TRANSISTORS AND DIODES...
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Page 4: About Lead Free Solder (Pbf: Pb Free)
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 1 ABOUT LEAD FREE SOLDER (PbF: Pb free) Note: In the information below, Pb, the symbol for lead in the periodic table of elements, will refer to standard solder or solder that contains lead. -
Page 5: How To Recognize That Pb Free Solder Is Used
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 1.2. How to Recognize that Pb Free Solder is Used (Example: Handset P.C.B.) Marked JTAG VBAT Q251 Q252 R257 R261 C209 R256 C382 R258 RA201 C241 C361 R209 IC241 L352 L326 D326 C354... -
Page 6: Operating Instructions
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 4 OPERATING INSTRUCTIONS 4.1. Battery 4.1.1. Battery Installation 4.1.2. Battery Charge 4.1.3. Recharging the Battery Note for service: The battery strength may not be indicated correctly if the battery is disconnected and connected again, even after it is fully... -
Page 7: Battery Strength
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 4.1.4. Battery Strength 4.1.5. Battery Replacement 4.1.6. Battery Performance... -
Page 8: Location Of Controls
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 4.2. Location of Controls 4.2.1. Base Unit 4.2.2. Handset... -
Page 9: Display
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 4.3. Display 4.3.1. Display Items 4.3.2. Troubleshooting (Handset LCD) -
Page 10: Settings
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 4.4. Settings 4.4.1. Connections... -
Page 11: Guide To Handset Programming
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 4.4.2. Guide to Handset Programming... - Page 12 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 4.4.3. Dial Lock 4.4.3.1. To turn dial lock on 4.4.3.2. To turn dial lock off...
- Page 13 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 4.4.4. Direct Commands...
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Page 14: Troubleshooting
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 4.5. Troubleshooting If the handset display shows error messages, see “Troubleshooting (Handset LCD) (P.9)” for the Cause & Solution. - Page 15 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS...
- Page 16 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS...
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Page 17: Disassembly Instructions
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 5 DISASSEMBLY INSTRUCTIONS 5.1. Base Unit Shown in Fig.- To Remove - Remove - Cabinet Cover Screws (2.6 × 14)..(A) × 4 Main P. C. Board Tapes, Solders and Cable Main P. C. Board Cabinet Body Screws (2.6 ×... -
Page 18: Handset
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 5.2. Handset Shown in Fig.- To Remove - Remove - Cabinet Cover Screw Cover Screw (2.6 × 12)..(D) × 1 Screws (2 × 9).....(E ) × 2 Screws (2 × 14)...(F ) × 2 Follow the procedure. -
Page 19: How To Replace The Handset Lcd
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 6 HOW TO REPLACE THE HANDSET LCD... -
Page 20: Troubleshooting Guide
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 7 TROUBLESHOOTING GUIDE Cross Reference: Check Power (P.21) Check Battery Charge (P.22) Check Link (P.23) Check the RF part (P.24) Check Handset Transmission (P.30) Check Handset Reception (P.30) Check Caller ID (P.30) -
Page 21: Check Power
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 7.1. Check Power Cross Reference: Note: Power Supply Circuit (P.51) DSP is IC501. Reset Circuit (P.53) -
Page 22: Check Battery Charge
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 7.2. Check Battery Charge Note: DSP is IC501. -
Page 23: Check Link
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 7.3. Check Link Note: Cross Reference: DSP is IC501. Check the RF part (P.24) (*1) Refer to Finding out the Defective part (P.24). -
Page 24: Check The Rf Part
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 7.4. Check the RF part 7.4.1. 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. - Page 25 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 7.4.2. RF Check Flowchart Each item (1 ~ 6) of RF Check Flowchart corresponds to Check Table for RF part (P.26). Please refer to the each item.
- Page 26 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 7.4.3. Check Table for RF part Item BU (Base Unit) Check HS (HandSet) Check Link Confirmation Normal 1. Register Regular HS to BU (to be checked). 1. Register HS (to be checked) to Regular BU.
- Page 27 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 7.4.4. 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 1. Register Regular HS to BU (to be checked).
- Page 28 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 7.4.5. RF-DSP Interface Signal Wave Form <Test Burst Mode>...
- Page 29 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS <Test Burst Mode>...
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Page 30: Check Handset Transmission
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 7.5. Check Handset Transmission Cross Reference: SIGNAL ROUTE (P.65). 7.6. Check Handset Reception Cross Reference: SIGNAL ROUTE (P.65). Note: When checking the RF part, Refer to Check the RF part (P.24) 7.7. Check Caller ID Cross Reference: Telephone Line Interface (P.54). -
Page 31: Adjustment And Test Mode
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 8 ADJUSTMENT AND TEST MODE 8.1. Test Mode Flow Chart for Base Unit 8.1.1. Test Burst Mode Note: (*1) When you check test mode, connect to the external Buttons because Base Unit has only LOCATOR key. Refer to “For Test Mode”... - Page 32 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 8.1.2. RX-CW Test Mode Note: (*1) When you check test mode, connect to the external Buttons because Base Unit has only LOCATOR key. Refer to “For Test Mode” in Base Unit Reference Drawing (P.40). -Insert AC adaptor during checking.
- Page 33 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 8.1.3. Test Link Mode Note: (*1) When you check test mode, connect to the external Buttons because Base Unit has only LOCATOR key. Refer to “For Test Mode” in Base Unit Reference Drawing (P.40). -Insert AC adaptor during checking.
- Page 34 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 8.1.4. Adjustment Mode Cross Reference Check and Adjust X501 (Base Unit) Frequency (P.39) Note: (*1) When you check test mode, connect to the external Buttons because Base Unit has only LOCATOR key. Refer to “For Test Mode”...
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Page 35: Test Mode Flow Chart For Handset
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 8.2. Test Mode Flow Chart for Handset 8.2.1. Test Burst Mode Note: (*1) LCD displays the Channel number. (exception: default/ CH00 = 1ch.) (*2) Refer to Check Table for RF part (P.26) and RX-CW Test Mode (P.32) for proper Base Unit Settings. - Page 36 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 8.2.2. RX-CW Test Mode Note: (*1) LCD displays the Channel number. (exception: default/ CH00 = 1ch.) (*2) Refer to Check Table for RF part (P.26) and Test Burst Mode (P.31) for proper Base Unit Settings.
- Page 37 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 8.2.3. Test Link Mode Note: (*1) LCD displays the Channel number. (exception: default/ CH00 = 1ch.) (*2) for factory use only. (*3) Refer to Check Table for RF part (P.26) and Test Link Mode (P.33) for proper Base Unit Settings.
- Page 38 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 8.2.4. Adjustment Mode Cross Reference (*1) Adjust Battery Low Detector Voltage (Handset) (P.39) Note: (*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 Spectrum Analyzer for checking.
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Page 39: X501 (Base Unit), X201 (Handset) Check
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 8.3. X501 (Base Unit), X201 (Handset) Check Equipment: Frequency counter Check Point for measurement: BCK Checking tolerance: 13.824MHz ± 100Hz (Base Unit)/13.824MHz ± 100Hz (Handset) 8.3.1. Check and Adjust X501 (Base Unit) Frequency 1. -
Page 40: Base Unit Reference Drawing
8.5. Base Unit Reference Drawing When connecting the Simulator Equipment for checking, please refer to below. DC_VOLT Oscilloscope METER RSSI (RS) ANT1 CN101 Spectrum P101 D301 Analyzer CN301 C301 C382 SA102 SA103 FL901 C381 D371 C305 D362 SA101 Q361 C384 L371 SA104 R361... -
Page 41: Handset Reference Drawing
8.6. Handset Reference Drawing When connecting the Simulator Equipment for checking, please refer to below. MONITOR_SP AC VOLT Oscilloscope DC_VOLT_METER METER VBAT1 VSS1 Spectrum VBAT2 Oscilloscope Analyzer DC_POWER_SUPPLY 2.6V 2.33V 2.3~2.90V VSS2 (pin 79) (Battery) SP_PHONE JTAG VBAT Q251 Q252 R257 R261 C209... -
Page 42: Frequency Table
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 8.7. Frequency Table Channel TX/RX Frequency TEST MODE Frequency Channel TX/RX Frequency TEST MODE Frequency (MHz) (MHz) (MHz) (MHz) 2400.914355 2400.724512 2457.994043 2457.804199 2401.808203 2401.618359 2458.887891 2458.698047 2402.698096 2402.508252 2459.777783 2459.587939 2403.591943 2403.402100 2460.671631... -
Page 43: How To Clear User Setting (Handset Only)
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 8.8. How to Clear User Setting (Handset Only) 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. -
Page 44: Description
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 9 DESCRIPTION 9.1. Frequency The frequency range of 2.4GHz-2.48GHz is used. Transmitting and receiving channel between Base Unit and Handset is same frequency. Refer to Frequency Table (P.42). 9.2. 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 telephone system that can use multiple portable unit simultaneously. - Page 45 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 9.2.1. TDD Frame Format Sync Field (72bit): Preamble 56bit + SyncWord 16bit Base Unit (Handset) adjusts the timing of reception so that reception of Base Unit (Handset) can correspond to transmission of Handset (Base Unit).
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Page 46: Signal Flowchart In The Whole System
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 9.3. 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 TX-DATA. -
Page 47: Explanation Of Link Data Communication
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 10 EXPLANATION OF LINK DATA COMMUNICATION 10.1. Calling 10.2. To Terminate Communication 10.3. Ringing... -
Page 48: Block Diagram (Base Unit_Main)
11 BLOCK DIAGRAM (BASE UNIT_MAIN) Q141 KEYS D101 CN101 Q161 Q156 R131,R132 Ti p SIDE TONE LINE INUSE CIRCUIT SEIZURE DETECT Ring TEL JACK X501 Q521 13.824MHz Q171 CN301 RECEIVE Q111 OSC_IN DC JACK LOUT BELL DETECT RXDATA RF_PART TXDATA DCIN MOD_EN BELL... -
Page 49: Block Diagram (Base Unit_Rf Part)
12 BLOCK DIAGRAM (BASE UNIT_RF PART) MOD_EN VBATT2 SCLK SDATA SDIO OSC_IN TX_EN Serial Interface ANTENNA 2.4GHz TX_DATA Frac-N IC901 FL901 RSSI D903,D904 Slicer RX_DATA det. 2.4GHz 2MHz 2.4GHz Mod/Demod Circuit SHCTRL RF_RESET RX_EN RX_GAIN KX-TG2448 BLOCK DIAGRAM (Base Unit_RF Part) -
Page 50: Circuit Operation (Base Unit_Main)
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 13 CIRCUIT OPERATION (BASE UNIT_MAIN) 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 functions as follows. -
Page 51: Power Supply Circuit
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 13.3. 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: 4.0V DCDC Converter... - Page 52 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 13.3.1. Charge Circuit The voltage from the AC is supplied to the charge circuits. Main charge (180mA at the Battery) of maximum 6-hours is started soon after the Handset is placed on the Base Unit. Then it changes to Trickle charge to prevent from overcharging.
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Page 53: Reset Circuit
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 13.4. 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 54: Telephone Line Interface
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 13.5. 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. -
Page 55: Parallel Connection Detect Circuit
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 13.6. 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 connected in parallel is on hook or off hook by detecting changes in the T/R voltage. -
Page 56: Calling Line Identification (Caller Id)
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 13.7. 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 57: Ghz Mod/Demod Circuit (Base Unit Rf Part)
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 13.8. 2.4GHz Mod/Demod Circuit (Base Unit RF Part) IC901 incorporates all of the modulation and demodulation functions. TX Digital data (TX_DATA) from DSP is supplied to pin 27 of IC901, and then 2.4GHz TX modulated signal is output from pin1. This TX signal is filtered by BPF (FL901) and supplied to Antenna. -
Page 58: Block Diagram (Handset_Main)
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 14 BLOCK DIAGRAM (HANDSET_MAIN) IC241 X201 EEPROM 13.824MHz Q231 CHARGE DETECT CHG_DET OSC_IN Q361 Q362, Q363 RF part TX_DATA RX_DATA CHARGE CHG_CTL CHARGE CONTROL MOD_EN D361 IC221, Q221 SDIO RESET RESET SDATA SCLK... -
Page 59: Block Diagram (Handset_Rf Part)
15 BLOCK DIAGRAM (HANDSET_RF PART) MOD_EN VBATT2 SCLK SDATA SDIO OSC_IN TX_EN Serial Interface ANTENNA 2.4GHz TX_DATA Frac-N IC901 FL901 RSSI D903,D904 Slicer RX_DATA det. 2.4GHz 2MHz 2.4GHz Mod/Demod Circuit SHCTRL RF_RESET RX_EN RX_GAIN KX-TGA254 BLOCK DIAGRAM (Handset_RF Part) -
Page 60: Circuit Operation (Handset)
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 16 CIRCUIT OPERATION (HANDSET) 16.1. Construction The circuit mainly consists of DSP and RF part as shown in the block diagram. 16.1.1. DSP: IC201 Function • • • • Battery Low, Power down detect circuit •... -
Page 61: Power Supply Circuit
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 16.2. Power Supply Circuit Voltage is supplied separately to each block. -
Page 62: Charge Circuit
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 16.3. Charge Circuit When the Handset is put on the cradle of the Base unit, the power is supplied from CHARGE+ and CHARGE- terminals to charge the battery via R368 or Q361 and D361. The voltage between CHARGE+ and CHARGE- flows R231 → Q231 → pin38 of IC201, where the charge is detected. -
Page 63: Sending Signal
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 16.5. Sending Signal The voice signal from the microphone is input to DSP (90, 91). CN331 is the headset jack. When the headphone is connected, Q331 detects it. The input from the microphone of the Handset (MIN, MIP) is cut and the microphone signal from the headset is input to DSP (95). -
Page 64: Ghz Mod/Demod Circuit (Handset Rf Part)
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 16.7. 2.4GHz Mod/Demod Circuit (Handset RF Part) IC901 incorporates all of the modulation and demodulation functions. TX Digital data (TX_DATA) from DSP is supplied to pin 27 of IC901, and then 2.4GHz TX modulated signal is output from pin1. This TX signal is filtered by BPF (FL901) and supplied to Antenna. -
Page 65: Signal Route
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 17 SIGNAL ROUTE Each signal route is as follows. RF part signal route... -
Page 66: Cpu Data (Base Unit)
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 18 CPU DATA (BASE UNIT) 18.1. IC501 Description High High_Z Description High High_Z LINE_SZ 63 RXEN Active NOT_RLY On Hook Off Hook 64 TXEN Active BELL 65 RXGAIN High Off Hook On Hook... -
Page 67: Cpu Data (Handset)
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 19 CPU DATA (HANDSET) 19.1. IC201 Description High High_Z Description High High_Z GNDPA 61 LIGHTED SPOUTP 62 NC Normal BCLK 63 KEYSTROBE _E Active RSSI 64 KEYSTROBE _D Active 65 KEYSTROBE _C Active... -
Page 68: Explanation Of Ic Terminals (Rf Part)
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 20 EXPLANATION OF IC TERMINALS (RF PART) 20.1. IC901... -
Page 69: How To Replace A Flat Package Ic
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 21 HOW TO REPLACE A 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 70: Flat Package Ic Installation Procedure
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 21.3. FLAT PACKAGE IC INSTALLATION PROCEDURE 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 71: Cabinet And Electrical Parts (Base Unit)
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 22 CABINET AND ELECTRICAL PARTS (BASE UNIT) -
Page 72: Cabinet And Electrical Parts (Handset)
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 23 CABINET AND ELECTRICAL PARTS (HANDSET) Note: (*1) This cable is fixed by welding. Refer to HOW TO REPLACE THE HANDSET LCD (P.19). -
Page 73: Accessories And Packing Materials
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 24 ACCESSORIES AND PACKING MATERIALS 24.1. KX-TG2448BXF/BXS... -
Page 74: Base Unit
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 25 TERMINAL GUIDE OF THE ICs, TRANSISTORS AND DIODES 25.1. Base Unit 25.2. Handset... -
Page 75: Replacement Parts List
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 26 REPLACEMENT PARTS LIST Note: Ref. Part No. Part Name & Description Remarks 1. RTL (Retention Time Limited) PQGG10268Y1 GRILLE, BASE PS-HB The marking (RTL) indicates that the Retention Time is PQSX10277Z KEYBOARD SWITCH, LOCATOR KEY... - Page 76 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks L904 MQLRF22NJFB COIL R930 ERJ2GEJ102 L905 MQLRF10NJFB COIL R931 ERJ2GEJ102 L909 MQLRF1N8DFB COIL R932 ERJ2GEJ102 L911 MQLRF2N7DFB...
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Page 77: Handset
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C904 ECUE1H020CCQ PQHG10703Z RUBBER PARTS, RECEIVER C910 ECUE1H1R5CCQ 1.5P PQHR11105Z GUIDE, RECEIVER ABS-HB C911 ECUE1H470JCQ PQHS10652Z SPACER, CUSHION LCD... - Page 78 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks Q363 PQVTDTC143E TRANSISTOR(SI) R363 ERJ2GEJ473 Q373 PQVTXP151A13 TRANSISTOR(SI) R368 ERJ3GEYJ332 3.3K (DIODES) R376 ERJ2GEJ225 2.2M D223 MA111...
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Page 79: Accessories And Packing Materials
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS Ref. Part No. Part Name & Description Remarks C952 ECUE1H020CCQ C956 ECUE1H100DCQ C960 ECUE1H100DCQ C962 ECUE1H100DCQ C963 ECUE1H100DCQ C964 ECUE1H102KBQ 0.001 C965 ECJ0EC1H221J 220P C976 F1G1A1040003 C977 ECUE1H102KBQ 0.001 C979 ECUE1H102KBQ 0.001 C980 ECUE1C103KBQ 0.01... - Page 80 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS Memo...
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Page 81: For Schematic Diagram
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 27 FOR SCHEMATIC DIAGRAM 27.1. Base Unit (SCHEMATIC DIAGRAM (BASE UNIT_MAIN)) Notes: 1. DC voltage measurements are taken with voltmeter from the negative voltage line. 2. This schematic diagram may be modified at any time with the development of new technology. -
Page 82: Schematic Diagram (Base Unit_Main)
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 28 SCHEMATIC DIAGRAM (BASE UNIT_MAIN) 2.5V REG_2.5V VBATT2 VBATT2 Vout MOD_EN MOD_EN C383 Cont SDIO K470P SDIO IC381 SDATA SDATA SCLK SCLK R523 39K C521 C3P R521 1.8K TX_DATA Q521 TX_DATA RX_GAIN RX_GAIN... - Page 83 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 4.0V REFERENCE 1XX : TEL LINE 3.3V 3XX : POWER, CHARGE, 4XX : RESET,MIC, SP 5XX : DSP,RF I/F 4.0V CONVERTOR IC331 Q300 6XX : FLASH, KEY, LCD VCC 3.3V 7XX : RF(2.4G)
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Page 84: Schematic Diagram (Base Unit_Rf Part)
29 SCHEMATIC DIAGRAM (BASE UNIT_RF PART) MOD_EN 2.5V L902 VBATT2 10nH (PF) SDIO SDATA SCLK L905 R919 TX_DATA 10nH C983 K1000P C990 K1000P R930 C984 RX_GAIN J100P C991 2.4GHz TX 2.4GHz RF C938 VCC_PLL2A R940 D10P VCC_PLL2B GND_TX R931 C918 L911 RX_EN FL901... -
Page 85: Schematic Diagram (Base Unit_Operation)
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 30 SCHEMATIC DIAGRAM (BASE UNIT_OPERATION) LED902 INUSE GREEN INUSE_LED LED903 CHG_LED KEYS_C KEYIN1 MSG/LOCATOR 2APVCC KX-TG2448 SCHEMATIC DIAGRAM (Base Unit_Operation) -
Page 86: Schematic Diagram (Handset_Main)
KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS 31 SCHEMATIC DIAGRAM (HANDSET_MAIN) to RF PART C246 K0.1 OSC_IN RSSI TX_DATA MOD_EN RX_EN TX_EN RX_GAIN RX_DATA SHCTRL RF_RESET (10) SDATA IC249 (11) (12) SCLK SDIO RESET R249 VBATT2 (13) FLASH_BOOT (14) (15) - Page 87 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS TEST SIGNAL FREQUENCY:1KHz Headset TX -37dBm/600 C340 R340 K0.01 50mVp-p R331 2.6V HEADSET_JACK L331 L332 Q331 MIC1 MIC2 R332 R225 L334 Headset RX CN331 HEADSET-DET X201 170mVp-p/150 (Vol. MAX) 13.824MHz HANDSET SP R201 NC...
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Page 88: Schematic Diagram (Handset_Rf Part)
32 SCHEMATIC DIAGRAM (HANDSET_RF PART) MOD_EN 2.5V L902 VBATT2 10nH (PF) SDIO SDATA SCLK L905 R919 TX_DATA 10nH C983 K1000P C990 K1000P R930 C984 RX_GAIN J100P C991 2.4GHz TX 2.4GHz RF C938 VCC_PLL2A R940 D10P VCC_PLL2B GND_TX R931 C918 L911 RX_EN FL901 GND_RX... -
Page 89: Component View
33 CIRCUIT BOARD (BASE UNIT_MAIN) 33.1. Component View VBATT AC_Down (13.824MHz) CN101 P101 D301 CN301 C301 C382 SA102 SA103 FL901 C381 D371 C305 D362 SA101 Q361 C384 L371 SA104 R361 Q373 C306 C361 L361 IC381 R308 R362 Q362 RA901 C383 C373 D373 C122... -
Page 90: Flow Solder Side View
33.2. Flow Solder Side View MIC- MIC+ KX-TG2448/2459 KX-TG2499 /KI3 PQUP11366Z DVCC TXEN RXEN 2APVCC INUSE JG JC DCM2 ANT1 ANTG1 DCP2 KX-TG2448 CIRCUIT BOARD (Base Unit_Main (Flow Solder Side View)) -
Page 91: Circuit Board (Base Unit_Operation)
34 CIRCUIT BOARD (BASE UNIT_OPERATION) 34.1. Component View PQUP11295Z KX-TG5428 KX-TG2448 CIRCUIT BOARD (Base Unit_Operation (Component View)) -
Page 92: Flow Solder Side View
34.2. Flow Solder Side View 2APVCC KEYIN1 KEYS_C CHG_LED INUSE_LED KX-TG5428 PQUP11295Z KX-TG2448 CIRCUIT BOARD (Base Unit_Operation (Flow Solder Side View)) -
Page 93: Circuit Board (Base Unit_Rf Part)
35 CIRCUIT BOARD (BASE UNIT_RF PART) C999 L905 L902 C960 R919 C952 C956 R930 C990 C983 R909 C961 RA901 C984 C937 C991 C922 C977 R991 C996 C976 C938 C998 R940 C962 R931 D904 C918 L911 C963 IC901 C979 R943 C964 R941 R942 C939... - Page 94 Memo...
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Page 95: Circuit Board Component View
36 CIRCUIT BOARD (HANDSET_MAIN) 36.1. Component View VBATT1 Vcc_DSP 2.3~2.9V (pin 79) 2.6V (Battery) JTAG VBAT Q251 Q252 R257 R261 C209 R256 C382 R258 RA201 C241 C361 R209 IC241 L352 D326 L326 C354 R241 TDO TMS R251 R252 TDI TCK R352 R354 D327... - Page 96 36.2. Flow Solder Side View TALK LEFT PAUSE LED256 LED253 LED254 BACK LED257 MENU DOWN R402 R401 LED251 LED252 NEXT CN271 HOLD LED258 RIGHT PQUP11367Z MUTE KX-TG24**R KX-TGA254 CIRCUIT BOARD (Handset_Main (Flow Solder Side View))
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Page 97: Circuit Board (Handset_Rf Part)
37 CIRCUIT BOARD (HANDSET_RF PART) L902 L905 C960 R919 C983 C956 C952 C990 R930 R909 C984 C961 RA901 C937 C991 C922 C977 R991 C996 C976 C938 C998 R940 C962 C918 L911 R931 D904 C963 IC901 C979 R943 C964 R941 R942 C939 C993 R933... - Page 98 KX-TG2448BXF / KX-TG2448BXS / KX-TGA254BXF / KX-TGA254BXS KXTG2448BXF KXTG2448BXS KXTGA254BXF KXTGA254BXS...