Panasonic KX-TG2448BXF Service Manual Download Page 1

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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)

Telephone Equipment

ORDER NO. KM40512964CE

Summary of Contents for KX-TG2448BXF

Page 1: ...ed Unauthorized copying and distribution is a violation of law 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 Telephone Equipment ORDER NO KM40512964CE ...

Page 2: ...SE UNIT_MAIN 48 12 BLOCK DIAGRAM BASE UNIT_RF PART 49 13 CIRCUIT OPERATION BASE UNIT_MAIN 50 13 1 DSP Digital Speech Signal Processing IC501 50 13 2 EEPROM IC611 50 13 3 Power Supply Circuit 51 13 4 Reset Circuit 53 13 5 Telephone Line Interface 54 13 6 Parallel Connection Detect Circuit 55 13 7 Calling Line Identification Caller ID 56 13 8 2 4GHz Mod Demod Circuit Base Unit RF Part 57 14 BLOCK DI...

Page 3: ...MATIC DIAGRAM HANDSET_MAIN 81 28 SCHEMATIC DIAGRAM BASE UNIT_MAIN 82 29 SCHEMATIC DIAGRAM BASE UNIT_RF PART 84 30 SCHEMATIC DIAGRAM BASE UNIT_OPERATION 85 31 SCHEMATIC DIAGRAM HANDSET_MAIN 86 32 SCHEMATIC DIAGRAM HANDSET_RF PART 88 33 CIRCUIT BOARD BASE UNIT_MAIN 89 33 1 Component View 89 33 2 Flow Solder Side View 90 34 CIRCUIT BOARD BASE UNIT_OPERATION 91 34 1 Component View 91 34 2 Flow Solder ...

Page 4: ...eat too long PbF solder will tend to splash if it is heated much higher than its melting point approximately 1100 F 600 C If you must use Pb solder on a PCB manufactured using PbF solder remove as much of the original PbF solder as possible and be sure that any remaining is melted prior to applying the Pb solder When applying PbF solder to double layered boards please check the component side for ...

Page 5: ...51 C243 C244 1 4 5 8 R241 C241 C354 C313 C311 C312 MICM MICP C242 R325 C332 C334 L334 L331 R324 C211 C381 C373 L373 D361 D231 D223 D313 D312 L351 L352 X201 Q221 Q231 Q363 Q243 Q253 Q362 Q361 CHG1 BATTP BATTM CHG2 RX TX VBAT VSS IC241 C372 C371 IC381 1 1 3 3 2 2 5 4 4 1 3 2 5 4 1 3 5 4 C361 SHIELD PQUP11367Z IC901 KX TG24 R KX TG24 R PbF Marked Component View Note The location of the PbF mark is su...

Page 6: ...te 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 6 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 7: ...4 1 4 Battery Strength 4 1 5 Battery Replacement 4 1 6 Battery Performance 7 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 8: ...4 2 Location of Controls 4 2 1 Base Unit 4 2 2 Handset 8 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 9: ...4 3 Display 4 3 1 Display Items 4 3 2 Troubleshooting Handset LCD 9 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 10: ...4 4 Settings 4 4 1 Connections 10 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 11: ...4 4 2 Guide to Handset Programming 11 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 12: ...4 4 3 Dial Lock 4 4 3 1 To turn dial lock on 4 4 3 2 To turn dial lock off 12 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 13: ...4 4 4 Direct Commands 13 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 14: ...4 5 Troubleshooting If the handset display shows error messages see Troubleshooting Handset LCD P 9 for the Cause Solution 14 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 15: ...15 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 16: ...16 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 17: ...ove Remove 1 Cabinet Cover Screws 2 6 14 A 4 Main P C Board Tapes Solders and Cable Main P C Board 2 Cabinet Body Screws 2 6 14 B 6 3 Operational P C Board Clear Grille Screws 2 6 8 C 2 Operational P C Board 17 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 18: ...emove Remove 4 Cabinet Cover Screw Cover Screw 2 6 12 D 1 Screws 2 9 E 2 Screws 2 14 F 2 5 Follow the procedure 6 Main P C Board Tape and Solders Screws 2 9 G 5 Main P C Board 18 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 19: ...6 HOW TO REPLACE THE HANDSET LCD 19 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 20: ...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 7 TROUBLESHOOTING GUIDE 20 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 21: ...Cross Reference Power Supply Circuit P 51 Reset Circuit P 53 Note DSP is IC501 7 1 Check Power 21 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 22: ...Note DSP is IC501 7 2 Check Battery Charge 22 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 23: ...Note DSP is IC501 1 Refer to Finding out the Defective part P 24 Cross Reference Check the RF part P 24 7 3 Check Link 23 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 24: ...e 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 7 4 1 1 Re registering the Handset 24 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 25: ...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 25 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 26: ...rm that RSSI of the Regular BU is approximately 2V by Oscilloscope 6 5 RX Sensitivity confirmation Regular HS BU Mode Test Burst Mode 1 HS BU to be checked Mode RX CW Mode 4 1 Place the Regular HS about 15cm away from the BU 2 Confirm that RSSI of the BU is approximately 2V by Oscilloscope 5 1 Place the HS about 15cm away from the Regular BU 2 Confirm that RSSI of the HS is approximately 2V by Osc...

Page 27: ...lar HS to BU to be checked 2 Set BU to Test Link mode 3 Set Regular HS to Test Link mode Set TX Power and RX Sensitivity of the BU and Regular HS by CHART1 At distance of about 20m between HS and BU Link OK RX Sensitivity of the BU is OK No Link RX Sensitivity of the BU is NG 1 Register HS to be checked to Regular BU 2 Set Regular BU to Test Link mode 3 Set HS to Test Link mode Set TX Power and RX...

Page 28: ...7 4 5 RF DSP Interface Signal Wave Form Test Burst Mode 28 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 29: ... Test Burst Mode 29 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 30: ... the RF part P 24 7 7 Check Caller ID Cross Reference Telephone Line Interface P 54 Calling Line Identification Caller ID P 56 Note Make sure the format of the Caller ID service of the Telephone company that the customer subscribed to Also we recommend to confirm that the customer is really a subscriber of the service 30 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 31: ...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 2 Refer to Check Table for RF part P 26 and RX CW Test Mode P 36 for proper Handset Settings 31 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 32: ...ons because Base Unit has only LOCATOR key Refer to For Test Mode in Base Unit Reference Drawing P 40 Insert AC adaptor during checking 2 Refer to Check Table for RF part P 26 and Test Burst Mode P 35 for proper Handset Settings 32 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 33: ... Base Unit has only LOCATOR key Refer to For Test Mode in Base Unit Reference Drawing P 40 Insert AC adaptor during checking 2 for factory use only 3 Refer to Check Table for RF part P 26 and Test Link Mode P 37 for proper Handset Settings 33 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 34: ... 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 2 Refer to the table below if using Spectrum Analyzer for checking 34 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 35: ... 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 35 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 36: ...ode 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 36 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 37: ...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 37 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 38: ...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 38 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 39: ...key to Adjust Crystal mode Clock Adj is displayed on LCD Check BCK frequency 4 If the BCK frequency is out of the checking tolerance 100Hz adjust to Adjustment tolelance 30Hz by pressing or key Adjustment Tolerance 13 824MHz 30Hz 5 Press TALK key to write the new frequency factor in EEPROM 6 Turn the power off Then this value is available Cross Reference Adjustment Mode P 38 8 4 Adjust Battery Low...

Page 40: ...C101 C373 C371 R377 R374 R372 R371 R373 R363 R375 D300 R300 C307 C332 C331 R675 R677 C677 C679 C663 C664 C666 C668 C669 C670 C665 R601 C601 C603 C455 C453 R453 R459 C459 R460 C456 R454 C457 C458 C454 C667 C660 C672 C671 C421 C675 Y GND JS JC JO JI G R B R421 RST PDN C423 R423 C422 R422 C342 R602 FCS TXO RSSI FSI FSO FRST UG RDY MIP MIN INT0 INT1 UVCC FCLK L401 L402 C166 C165 C167 C142 R145 C120 C3...

Page 41: ...249 SPM SPP R201 Q251 Q252 Q373 CA274 CA271 TP_TESTN R209 C377 C226 R315 R314 C315 C314 R224 C222 R208 R222 C306 C221 R228 IC221 R340 BCK R232 R376 R377 R351 C243 C244 1 4 5 8 R241 C241 C354 C313 C311 C312 MICM MICP C242 R325 C332 C334 L334 L331 R324 C211 C381 C373 L373 D361 D231 D223 D313 D312 L351 L352 X201 Q221 Q231 Q363 Q243 Q253 Q362 Q361 CHG1 BATTP BATTM CHG2 RX TX VBAT VSS IC241 C372 C371 I...

Page 42: ...3057 44 2439 266748 2439 076904 45 2440 156641 2439 966797 46 2441 050488 2440 860645 47 2441 940381 2441 750537 48 2442 834229 2442 644385 49 2443 724121 2443 534277 50 2444 617969 2444 428125 51 2445 507861 2445 318018 52 2446 401709 2446 211865 53 2447 291602 2447 101758 54 2448 185449 2447 995605 55 2449 075342 2448 885498 56 2449 969189 2449 779346 57 2450 859082 2450 669238 58 2451 752930 24...

Page 43: ...on Erase stored Phone numbers Caller list and etc This operation should not be performed for a usual repair Note 1 Be sure to short the battery terminals of the Handset with a lead wire etc for 2 seconds for discharge after removing the battery 43 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 44: ...quency The construction of RX TX frequency data is shown below It consists of 4 slots from the Base Unit to the Handset and 4 slots from the Handset to the Base Unit total 8 slots in 10ms By this slot system simultaneous air link and communication between 4 Handsets and the Base Unit can be realized One communication between Handset and the Base Unit is done by one slot from the Base Unit to Hands...

Page 45: ...plex communications simultaneously In 1 slot 1 25ms the 10ms of voice data is transmitted Each slot makes every frame frequency hop 100hops sec Although each slot UpLink3 and UpLink4 uses different frequency UpLink3 and DownLink3 use the same frequency Handset Link Traffic Bearer A link is established between Base Unit and Handset The state where duplex communication is performed The hopping patte...

Page 46: ...D TDMA and ADPCM decoding to convert the RXDATA into the voice signal then it is output to the speaker Transmission The voice signal entering from the Handset microphone is led to DSP IC201 The DSP encodes ADPCM and TDD TDMA with FHSS to TX DATA The TX DATA signal enters to IC101 of RF PART and is modulated to 2 4GHz The RF signal is fed into Tx Rx switch D904 The RF signal is passed through filte...

Page 47: ...10 EXPLANATION OF LINK DATA COMMUNICATION 10 1 Calling 10 2 To Terminate Communication 10 3 Ringing 47 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 48: ...N LOUT Q361 Q362 RF_PART HSMIN HSMIP IC501 DSP CHG 4 0V CONVERTOR INUSE DETECT RECEIVE AMP DCIN IC331 RESET POWER_DOWN LINE_SZ VRCCR VCC VCCA VCCPA CHARGE CONTROL CHG_CTL INT_1 VBATT2 INT_1 5 VCC IC611 EEPROM KEYS IC300 Q300 R131 R132 Q171 Q371 Q372 OSC_IN WP CLK INUSE_LED MSG_LED KEY1 KEYC OSC AMP 3 3V REGULATOR with RESET Q521 DATA RSSI SHCTRL MOD_EN TX_EN RX_EN SDATA SCLK TXDATA RXDATA SLE SDIO...

Page 49: ...M det Slicer Serial Interface VCC 2 4GHz Mod Demod Circuit 2 4GHz 2 4GHz MOD_EN SCLK SDIO SLE OSC_IN TX_EN SDATA TX_DATA RX_DATA RSSI SHCTRL RF_RESET RX_EN RX_GAIN DSP VBATT2 FL901 D903 D904 RXGAIN KX TG2448 BLOCK DIAGRAM Base Unit_RF Part KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS 49 ...

Page 50: ...med during Record Play back and Line Monitoring modes of operation When the DTMF data from the Handset is received the DTMF signal is output Caller ID demodulation The DSP implements monitor and demodulate the FSK signals that provide CID information from the Central Office Analog Switching The voice signal from telephone line is transmitted to the speaker or the voice signal from speakerphone mic...

Page 51: ...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 IC331 3 3V Regulator 51 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 52: ...ery 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 Q361 and Q362 detect the ON HOOK state Handset is placed on Base Unit Q371 and Q372 control the charge current 52 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 53: ...en the AC Adaptor is inserted into the unit then the voltage is shifted by IC331 and power is supplied to the DSP The set starts to operate when VCC goes up to 3 0V or more in the circuit voltage diagram Note 1 The initializing time of the DSP chip is 26 6ms under normal conditions 53 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 54: ... ring signal Q141 turns on thus providing an off hook condition active DC current flow through the circuit Following signal flow is the DC current flow T L101 D101 Q141 Q161 R163 D101 L102 P101 R ON HOOK Circuit Q141 is open Q141 is connected as to cut the DC loop current and to cut the voice signal The unit is consequently in an on hook condition Pulse Dial Circuit Pin 4 of DSP turns Q141 ON OFF ...

Page 55: ...ng changes in the T R voltage Circuit Operation Parallel connection detection when on hook When on hook Q136 is ON the voltage is monitored pin 35 of IC501 There is no parallel connection if the voltage is 1 65 V or higher while a parallel connection is deemed to exist if the voltage is lower Parallel connection detection when off hook When off hook Q136 is OFF the voltage is monitored pin 35 of I...

Page 56: ...sen according to the exchange of telephone office This unit is available to receive the data with both methods and displays the received data on LCD FSK Frequency Shift Keying format DTMF format It is the method to send the telephone number of calling party with DTMF to the telephone DTMF is sent before the first bell signal The data is sent in turn first the start code secondly the telephone numb...

Page 57: ...X signal is filtered by BPF FL901 and supplied to Antenna 2 4GHz RX signal from the Antenna is filtered by BPF FL901 and supplied to pin4 of IC901 then demodulated signal RX_DATA comes out from pin 16 At the same time RSSI Received Signal Strength Indicator outputs from pin 14 Reference clock 13 824MHz from DSP block is supplied to pin 11 of IC901 VBATT2 supplies 2 5V regulated voltage 57 KX TG244...

Page 58: ... RX_GAIN RX_EN TX_EN SHCTRL RF_RESET RSSI WP SCL SDA LCD_LIGHT KEY_LIGHT KEYSTOROBE_A F KEYIN_1 5 Q231 CHARGE DETECT CHARGE D361 Q361 IC221 Q221 Q362 Q363 CHARGE CONTROL RESET POWER DOWN REGULATOR 3 0V CONVERTOR MIC SP Headset Jack CN331 Q331 HEADSET DETECT Monitor SP 2 5V REGULATOR LCD KEYS RF part ANT X201 13 824MHz EEPROM BATTERY TX_DATA RX_DATA OSC_IN KX TGA254 BLOCK DIAGRAM Handset 58 KX TG24...

Page 59: ...M det Slicer Serial Interface VCC 2 4GHz Mod Demod Circuit 2 4GHz 2 4GHz MOD_EN SCLK SDIO SLE OSC_IN TX_EN SDATA TX_DATA RX_DATA RSSI SHCTRL RF_RESET RX_EN RX_GAIN DSP VBATT2 FL901 D903 D904 RXGAIN KX TGA254 BLOCK DIAGRAM Handset_RF Part KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS 59 ...

Page 60: ...er Generation Interface circuit RF part Speaker Mic LED Key scan LCD Headset Initialize Note 1 The initializing time of the DSP chip is 20ms under normal conditions 16 1 2 RF part Mainly voice signal is modulated to RF or it goes the other way 16 1 3 EEPROM IC241 All setting data is stored ex ID code user setting Phonebook Caller ID data 60 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 61: ...16 2 Power Supply Circuit Voltage is supplied separately to each block 61 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 62: ... flows R231 Q231 pin38 of IC201 where the charge is detected Then IC201 calculates the battery consumption amount from the previous charge and it controls Q361 Q362 Q363 by pin80 of IC201 until charging is complete When charging is complete the control pattern is switched to Trickle charging form from Operational charging form 16 4 Ringer and Handset SP Phone 62 KX TG2448BXF KX TG2448BXS KX TGA254...

Page 63: ...ophone is supplied from DSP 92 and the power is turned OFF on standby 16 6 Reception Signal The voice signal from the Base Unit is output to DSP 98 HSSPOUT This signal is led to the headset jack CN331 The signal through the headset jack and the other signal output from DSP 97 drives the speaker When the headset is inserted into the jack the voice signal is cut at the jack so the sound does not com...

Page 64: ... signal is filtered by BPF FL901 and supplied to Antenna 2 4GHz RX signal from the Antenna is filtered by BPF FL901 and supplied to pin4 of IC901 then demodulated signal RX_DATA comes out from pin 16 At the same time RSSI Received Signal Strength Indicator outputs from pin 14 Reference clock 13 824MHz from DSP block is supplied to pin 11 of IC901 VBATT2 supplies 2 5V regulated voltage 64 KX TG2448...

Page 65: ...17 SIGNAL ROUTE Each signal route is as follows RF part signal route 65 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 66: ...A I 43 MIP A I 44 GNDR GND 45 TXMOD A O 46 VREFR A O 47 RSSI A I 48 VCCR VCC 49 GNDPLL GND 50 VCCPLL VCC 51 XOUT A O 52 XIN A I 53 GND GND 54 Reset D I Normal Reset 55 Power Down D I Normal Power Down 56 NC D O 57 TX_OUT D O High Low 58 MOD_EN D O Active Not 59 NC D O 60 NC D O 61 NC D O 62 NC D O PIN Description I O High High_Z Low 63 RXEN D O Active Off 64 TXEN D O Active Off 65 RXGAIN D O High ...

Page 67: ... Reset 51 FLASH_SCK D O High Low 52 NC D O Normal 53 LED_BL1 D O On Off 54 LED_BL2 D O On Off 55 LED_BL3 D O On Off 56 DOT_LCD_RS D O Data Instruct 57 DOT_LCD _RW_WR D O Read Write 58 DOT_LCD _E_RD D O Active Not 59 DOT_LCD _POWER_SW D O On Off 60 ANT_LED D O On Off PIN Description I O High High_Z Low 61 LIGHTED D O On Off 62 NC D O Normal 63 KEYSTROBE _E D O Not Active 64 KEYSTROBE _D D O Not Act...

Page 68: ...20 EXPLANATION OF IC TERMINALS RF PART 20 1 IC901 68 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 69: ...y 0 82 Type RMA lower residue non cleaning type Note See ABOUT LEAD FREE SOLDER PbF Pb free P 4 21 2 FLAT PACKAGE IC REMOVAL PROCEDURE 1 Put plenty of solder on the IC pins so that the pins can be completely covered Note If the IC pins are not soldered enough you may give pressure to the P C board when cutting the pins with a cutter 2 Make a few cuts into the joint between the IC and its pins firs...

Page 70: ...ding soldering foil 2 Apply flux to all pins of the FLAT PACKAGE IC 3 Solder the pins sliding the soldering iron in the direction of the arrow 21 4 BRIDGE MODIFICATION PROCEDURE 1 Lightly resolder the bridged portion 2 Remove the remaining solder along the pins using a soldering iron as shown in the figure below 70 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 71: ...22 CABINET AND ELECTRICAL PARTS BASE UNIT 71 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 72: ...23 CABINET AND ELECTRICAL PARTS HANDSET Note 1 This cable is fixed by welding Refer to HOW TO REPLACE THE HANDSET LCD P 19 72 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 73: ...24 ACCESSORIES AND PACKING MATERIALS 24 1 KX TG2448BXF BXS 73 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 74: ...25 TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES 25 1 Base Unit 25 2 Handset 74 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 75: ...PARTS PET SHEET 11 PQKM10649Z1 CABINET BODY ABS HB 12 PQSA10180Z ANTENNA 13 PQKE10433Z1 COVER ANTENNA CAP L 14 PQHX11305Z PLASTIC PARTS PET SHEET 15 PQHR11063Z GUIDE CHARGE TERMINAL PS HB 16 PQKE10338Z1 HOLDER CHARGE TERMINAL POM HB 17 PQJT10238Z TERMINAL CHARGE 18 PQHR11062Z GUIDE CHARGE TERMINAL PS HB 19 PQYF10594Y1 CABINET COVER PS HB 20 PQGT18522Z NAME PLATE for KX TG2448BXF 20 PQGT18520Z NAME...

Page 76: ...03X 10K R909 ERJ2GEJ331 330 R919 ERJ2GEJ102 1K Ref No Part No Part Name Description Remarks R930 ERJ2GEJ102 1K R931 ERJ2GEJ102 1K R932 ERJ2GEJ102 1K R933 ERJ2GEJ331 330 R940 ERJ2GEJ4R7 4 7 R941 ERJ2GEJ100 10 R942 ERJ2GEJ100 10 R943 ERJ2GE0R00 0 R991 ERJ2GEJ102 1K CAPACITORS C101 ECUV2H681KB 680P S C102 ECUV2H681KB 680P S C111 F1J2A473A024 0 047 C112 F1J2A473A024 0 047 C113 PQCUV1A684KB 0 68 C120 E...

Page 77: ...105Z GUIDE RECEIVER ABS HB 111 PQHS10652Z SPACER CUSHION LCD 112 PQBC10417Z1 BUTTON NAVI KEY ABS HB 113 PQHX11325Z PLASTIC PARTS PET SHEET 114 PQSX10275Y KEYBOARD SWITCH 115 PQHS10656Z WATER SHIELD PARTS MIC 116 PQHG10679Z PACKING EARPHONE 117 PQSA10179Z ANTENNA 118 PQWE10042Z BATTERY TERMINAL ABS HB 119 PQJT10220Z TERMINAL CHARGE L 120 PQJT10221Z TERMINAL CHARGE R 121 PQHR10778Z GUIDE SP HOLDER A...

Page 78: ...J2GEJ102 1K R334 ERJ2GEJ222 2 2K R340 ERJ2GE0R00 0 R361 ERJ2GEJ473 47K R362 ERJ2GEJ102 1K Ref No Part No Part Name Description Remarks R363 ERJ2GEJ473 47K R368 ERJ3GEYJ332 3 3K R376 ERJ2GEJ225 2 2M R377 ERJ3GEYJ106 10M R401 ERJ2GEJ101 100 R402 ERJ2GEJ182 1 8K R906 ERJ2RKF103X 10K R909 ERJ2GEJ331 330 R919 ERJ2GEJ102 1K R930 ERJ2GEJ102 1K R931 ERJ2GEJ102 1K R932 ERJ2GEJ102 1K R933 ERJ2GEJ331 330 R94...

Page 79: ...4Z MAGNETIC SHIELD FRAME E107 PQMC10493Z MAGNETIC SHIELD COVER CN331 K2HD103D0001 JACK FL901 J0E2457B0008 LCR FILTER X201 H0J138500003 CRYSTAL OSCILLATOR 26 3 Accessories and Packing Materials Note 1 You can download and refer to the Operating Instructions Instruction book on TSN Server 26 3 1 KX TG2448BXF BXS Ref No Part No Part Name Description Remarks A1 PQLV1BXY AC ADAPTOR A2 PQJA10075Z CORD T...

Page 80: ...Memo 80 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 81: ...tic diagram may be modified at any time with the development of new technology 27 2 Handset SCHEMATIC DIAGRAM HANDSET_MAIN Notes 1 DC voltage measurements are taken with an oscilloscope or a tester with a ground 2 The schematic diagrams and circuit board may be modified at any time with the development of new technology 81 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 82: ... NC 28 NC NC R601 RDY C421 K0 1 C518 10uF NC R602 C603 NC R675 820 R680 NC R421 47K C120 K5600P C601 NC C525 K0 1 C521 C3P K0 01 C551 C522 K0 1 NC RA500 2 4 6 8 7 5 3 1 C365 K0 01 C524 K0 1 RA501 4 7K 7 5 3 1 2 4 6 8 KIN1 GND KIN2 KIN3 SPP C471 NC SPN C472 NC C458 NC NC R460 C457 NC NC R459 C459 NC INT0 INT1 R423 1K PDN C423 K0 1 RXD R679 NC NC C680 NC C677 NC C679 NC C675 R668 NC KEYS_A R669 NC K...

Page 83: ...60 NC R161 750 39K R162 R165 430 R166 NC R168 0 C178 K0 047 R171 27 C172 K2700P 50V C185 K0 018 10K R145 10K R142 CN301 DC JACK 1 DC 2 DC DCM DCM2 DCP2 DCP CN101 TEL JACK 1 T 2 R Q300 C308 K0 1 R308 120 R301 NC R305 NC R304 220 DCDC_IC 1 CE 2 GND 3 VOUT 4 EXT 5 VIN D300 R303 220 R300 NC K1 0 C304 C305 K0 01 C303 K0 01 C307 NC L300 22uH C306 100u 25V C300 47u 16V C342 K0 1 C341 330u 6 3V REG_3 3V 1...

Page 84: ...04 J47P C911 10 R941 10 R942 K1000P C941 K0 1 C976 D10P C963 D10P C962 J100P C984 D10P C917 1K R931 1K R932 330 R933 3 9nH L909 C2P C952 D10P C938 D10P C956 2 7nH L911 J220P C965 TP_TESTP TP_TESTN 0 R943 K1000P C990 C5P C991 1K R991 K470P C937 K0 1 C993 J120P C992 1uH 1005 L990 K0 1 C996 VBATT2 SDATA SLE SCLK TX_DATA RX_GAIN RX_EN TX_EN SHCTRL SDIO RX_DATA RF_RESET OSC_IN RSSI ANT 10nH PF L902 C5P...

Page 85: ...DIAGRAM BASE UNIT_OPERATION LED902 GREEN INUSE MSG LOCATOR LED903 RED CHG INUSE_LED CHG_LED KEYS_C KEYIN1 2APVCC KX TG2448 SCHEMATIC DIAGRAM Base Unit_Operation 85 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS ...

Page 86: ... R256 120 R258 120 Q252 1 B1 2 E 3 B2 4 C2 5 C1 Q253 MOD_EN CA274 K0 1 2 4 3 1 6 8 7 5 CA271 K0 47 3 1 2 4 C382 K1 0 C384 K1 0 TG TA RSSI_ RSSI 2 5V REG 1 NC 2 VSS 3 CE 4 VIN 5 VOUT 10K R251 10K R252 LED261 Amber RA251 330 1 3 7 5 6 8 4 2 100 R401 1 8K R402 LED252 LED254 LED251 Amber LED253 LED257 CN272 NC 22 RESETB 21 VSS 20 CAP1 19 CAP1 18 CAP2 17 CAP2 16 VOUT 15 VR 14 V0 13 V1 12 V2 11 V3 10 V4...

Page 87: ...BL 62 EGPIO6 63 STB_E 64 STB_D 65 STB_C 66 STB_B 67 STB_A 68 GND 69 VCC 70 TCK 71 TMS 72 TDI 73 TDO 74 KIN_1 75 KIN_2 76 76 KIN_3 77 KIN_4 78 KIN_5 79 AGPIO0 80 CHG_CTRL 81 EEPROM_SCL 82 EEPROM_SDA 83 UART_TX 84 UART_RX 85 EEPROM_WP 86 GND 87 PDN 88 IBAT 89 VREF 90 MIP 91 MIN 92 MIC_PWR 93 GNDA 94 VCCA 95 HEADSET_MIN 96 HEADSET_DET 97 HSSPOUTN 98 HSSPOUTP 99 VCCPA 100 SPOUTN C243 NC 6 3V330 C373 D...

Page 88: ...C2P C904 J47P C911 10 R941 10 R942 K1000P C941 K0 1 C976 D10P C963 D10P C962 J100P C984 D10P C917 1K R931 1K R932 330 R933 3 9nH L909 C2P C952 D10P C938 D10P C956 2 7nH L911 J220P C965 TP_TESTP TP_TESTN 0 R943 K1000P C990 C5P C991 1K R991 K470P C937 K0 1 C993 J120P C992 1uH 1005 L990 K0 1 C996 VBATT2 SDATA SLE SCLK TX_DATA RX_GAIN RX_EN TX_EN SHCTRL SDIO RX_DATA RF_RESET OSC_IN RSSI ANT 10nH PF L9...

Page 89: ...61 L371 L361 C102 C101 C373 C371 R377 R374 R372 R371 R373 R363 R375 D300 R300 C307 C332 C331 R675 R677 C677 C679 C663 C664 C666 C668 C669 C670 C665 R601 C601 C603 C455 C453 R453 R459 C459 R460 C456 R454 C457 C458 C454 C667 C660 C672 C671 C421 C675 Y GND JS JC JO JI G R B R421 RST PDN C423 R423 C422 R422 C342 R602 FCS TXO RSSI FSI FSO FRST UG RDY MIP MIN INT0 INT1 UVCC FCLK L401 L402 C166 C165 C167...

Page 90: ...r Side View A DCP2 DCP CP CM L1T ANT1 ANTG1 L1R DCM DCM2 SPP SPN VCC JG JC OSC CDL KI3 MIP MIN MIC MIC RED 2APVCC KI1 KSA CHG INUSE URX UTX R Y JS JI B G JO KX TG2448 2459 KX TG2499 PQUP11366Z TXO TXEN RXEN RXD DVCC GND PbF KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS 90 ...

Page 91: ...RCUIT BOARD BASE UNIT_OPERATION 34 1 Component View RED RED PbF KX TG5428 PQUP11295Z A WBM501 KX TG2448 CIRCUIT BOARD Base Unit_Operation Component View KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS 91 ...

Page 92: ...de View 2APVCC KEYIN1 KEYS_C CHG_LED INUSE_LED PbF KX TG5428 PQUP11295Z A LED902 LED903 MSG LOCATOR KX TG2448 CIRCUIT BOARD Base Unit_Operation Flow Solder Side View KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS 92 ...

Page 93: ...962 C963 C979 C964 R941 R942 R940 R931 R943 R933 C993 C942 C995 R932 C939 C918 L911 C940 C990 C991 C996 C998 D904 D903 L909 C997 C943 C910 C941 L990 C992 C944 R906 C946 C966 C965 C980 L901 L904 C911 L903 L913 C904 C917 C938 FL901 KX TG2448 CIRCUIT BOARD Base Unit_RF Part Component View KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS 93 ...

Page 94: ...Memo KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS 94 ...

Page 95: ... C322 L211 L326 L332 L327 D326 D327 R234 R249 SPM SPP R201 Q251 Q252 Q373 CA274 CA271 TP_TESTN R209 C377 C226 R315 R314 C315 C314 R224 C222 R208 R222 C306 C221 R228 IC221 R340 BCK R232 R376 R377 R351 C243 C244 1 4 5 8 R241 C241 C354 C313 C311 C312 MICM MICP C242 R325 C332 C334 L334 L331 R324 C211 C381 C373 L373 D361 D231 D223 D313 D312 L351 L352 X201 Q221 Q231 Q363 Q243 Q253 Q362 Q361 CHG1 BATTP B...

Page 96: ...low Solder Side View MENU PbF UP RIGHT MUTE NEXT BACK LED256 DOWN UP OFF LEFT 1 2 3 6 5 7 0 PAUSE 4 9 8 HOLD MIC TALK LCD CN271 PQUP11367Z A KX TG24 R KX TG24 R LED254 LED253 LED252 LED251 LED257 R402 R401 LED258 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS 96 ...

Page 97: ...2 C963 C979 C964 R941 R942 R940 R931 R943 R933 C993 C942 C995 R932 C939 C918 L911 C940 C990 C991 C996 C998 D904 D903 L909 C997 C943 C910 C941 L990 C992 C944 R906 C946 C966 C965 C980 L901 L904 C911 L903 L913 C904 C917 C938 FL901 KX TGA254 CIRCUIT BOARD Handset_RF Part Component View KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS 97 ...

Page 98: ...98 KX TG2448BXF KX TG2448BXS KX TGA254BXF KX TGA254BXS G N KXTG2448BXF KXTG2448BXS KXTGA254BXF KXTGA254BXS ...

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