Panasonic KX-TG2257BXS Service Manual Download

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KX-TG2257BXS

2.4GHz

Digital

Cordless

Answering

System

Silver Version

(for Asia, Middle Near East and Other area)

Telephone Equipment

ORDER NO. KM40206887C3

Summary of Contents for KX-TG2257BXS

Page 1: ... Ltd All rights reserved Unauthorized copying and distribution is a violation of law KX TG2257BXS 2 4GHz Digital Cordless Answering System Silver Version for Asia Middle Near East and Other area Telephone Equipment ORDER NO KM40206887C3 ...

Page 2: ...ton 26 8 DISASSEMBLY INSTRUCTIONS 27 9 ASSEMBLY INSTRUCTIONS 29 9 1 Assembly the LCD to P C Board Handset 29 10 TROUBLESHOOTING GUIDE 30 10 1 Check Power 31 10 2 Error Message Table 31 10 3 Check Record 32 10 4 Check Playback 33 10 5 Check Sp phone Transmission 34 10 6 Check Sp phone Reception 34 10 7 Check Battery Charge 35 10 8 Check Link 35 10 9 Check the RF Unit 36 10 10 Check Handset Transmis...

Page 3: ... Circuit 63 17 4 Ringer and Handset SP Phone 63 17 5 Sending Signal 63 17 6 Reception Signal 64 18 CPU DATA Base Unit 65 18 1 IC201 65 19 CPU DATA Handset 66 19 1 IC201 66 20 EXPLANATION OF RF UNIT TERMINALS 67 20 1 IC101 67 21 HOW TO REPLACE A FLAT PACKAGE IC 68 21 1 Preparation 68 21 2 Procedure 68 21 3 Removing Solder from Between Pins 68 22 CABINET AND ELECTRICAL PARTS Base Unit 69 23 CABINET ...

Page 4: ...eful not to heat 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 compon...

Page 5: ...igure below IC201 IC300 RFUNIT PBF 1 2 3 4 5 7 8 9 10 11 12 13 G G G G G G G G G G G G G G G 15 16 17 14 G G G G G G G 1 3 0 31 50 5 1 80 81 100 Stamped PBF Component View 1 2 2 Handset PCB PBF is stamped between battery terminals to show that Pb free solder is used See the figure below 1 IC201 30 31 50 81 100 51 80 RF_UNIT PBF Stamped PBF Component View 5 KX TG2257BXS ...

Page 6: ...ou can check the battery strength on the handset display The battery strength is as shown in the chart below 2 3 Recharge 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 6 KX TG2257...

Page 7: ...2 4 Battery information After your Panasonic battery is fully charged 3 BATTERY REPLACEMENT 7 KX TG2257BXS ...

Page 8: ...4 1 Base unit 4 LOCATION OF CONTROLS 8 KX TG2257BXS ...

Page 9: ...4 2 Handset 9 KX TG2257BXS ...

Page 10: ...5 DISPLAYS Both the handset and the base unit show you instructions and information on the displays These display prompts are shown below 5 1 Handset display 10 KX TG2257BXS ...

Page 11: ...11 KX TG2257BXS ...

Page 12: ...5 2 Base unit display 12 KX TG2257BXS ...

Page 13: ...mal for the adaptor to feel warm during use If your unit is connected to a PBX which does not support Caller ID services you cannot access those services When more than one unit is used the units may interfere with each other To prevent or reduce interference please leave ample space between the base units 13 KX TG2257BXS ...

Page 14: ...6 1 Adding Another Phone This unit will not function during a power failure To connect a standard telephone on the same line use a T adaptor 14 KX TG2257BXS ...

Page 15: ...7 1 Making Calls 7 OPERATION 7 1 1 Handset 15 KX TG2257BXS ...

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Page 19: ...7 1 2 Base Unit Digital Duplex Speakerphone 19 KX TG2257BXS ...

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Page 21: ...7 2 Answering Calls 7 2 1 Handset 7 2 2 Base Unit 21 KX TG2257BXS ...

Page 22: ...7 3 1 Setting the Unit to Answer Calls 7 3 Automatic Answering Operation 22 KX TG2257BXS ...

Page 23: ...7 4 Listening to Messages 7 4 1 Slow Talk Message Playback 23 KX TG2257BXS ...

Page 24: ...7 4 2 During playback 24 KX TG2257BXS ...

Page 25: ...7 4 3 From the Handset 25 KX TG2257BXS ...

Page 26: ...7 5 FLASH Button 26 KX TG2257BXS ...

Page 27: ...8 DISASSEMBLY INSTRUCTIONS Shown in Fig To Remove Remove 1 Lower Cabinet Screws 2 6 12 A 5 2 Main P C Board Remove the P C Board 3 Antenna Screw 3 10 B 1 Speaker Screws 3 8 C 3 27 KX TG2257BXS ...

Page 28: ...ove 4 Battery Cover Remove the Battery Cover 5 Rear Cabinet Screws 2 6 12 D 2 6 Rear Cabinet Remove the Rear Cabinet 7 Main P C Board Screw 2 6 12 E 1 Screws 2 6 10 F 2 Remove the lead wires Remove the P C Board 28 KX TG2257BXS ...

Page 29: ...9 ASSEMBLY INSTRUCTIONS 9 1 Assembly the LCD to P C Board Handset 29 KX TG2257BXS ...

Page 30: ...p phone Transmission P 34 Check Sp phone Reception P 34 Check Battery Charge P 35 Check Link P 35 Check the RF Unit P 36 Check Handset Transmission P 41 Check Handset Reception P 41 Check Caller ID P 41 1 See How to change the Auto Disconnect activation time P 32 10 TROUBLESHOOTING GUIDE 30 KX TG2257BXS ...

Page 31: ...Cross Reference Power Supply Circuit P 54 Reset Circuit P 55 Note Flash Memory is IC300 DSP is IC201 10 1 Check Power 10 2 Error Message Table Note Flash Memory is IC300 DSP is IC201 31 KX TG2257BXS ...

Page 32: ...ages are lower than conventional lines which may cause a malfunction of Auto Disconnect detection To solve this problem try changing the Auto Disconnect activation time through the procedures below Auto Disconnect activation time PROCEDURE Status Enable 2 sec default STOP REPEAT SP PHONE simultaneously Stand by 4 sec STOP REPEAT UP simultaneously Disable STOP REPEAT DOWN simultaneously If the Disa...

Page 33: ...Cross Reference Power Supply Circuit P 54 Note Flash Memory is IC300 DSP is IC201 10 4 Check Playback 33 KX TG2257BXS ...

Page 34: ... 56 Signal Route P 58 Cross Reference Telephone Line Interface P 56 Signal Route P 58 Note Flash Memory is IC300 DSP is IC201 Note Flash Memory is IC300 DSP is IC201 10 5 Check Sp phone Transmission 10 6 Check Sp phone Reception 34 KX TG2257BXS ...

Page 35: ...y Charge 10 8 Check Link Cross Reference Check the RF Unit P 36 Power Supply Circuit P 54 Power Supply Circuit P 62 Note Base Unit Flash Memory is IC300 DSP is IC201 Handset EEPROM is IC202 DSP is IC201 35 KX TG2257BXS ...

Page 36: ...ee Check Table for RF Block P 39 Note KX TG2257 with marks HS JIG BS JIG can be used only for troubleshooting However regular production set also can be used as a JIG 10 9 2 Converting a Regular Production Unit to a JIG Both base unit and handset unit have two modes TEST POWER LOW mode and NORMAL POWER mode even a Regular production unit Each unit can be used as a JIG by changing the original NORM...

Page 37: ...s follows if need Fixation CH Figure 1 CH POWER making key 1CH LOW FLASH 1 2CH LOW FLASH 2 3CH LOW FLASH 3 4CH LOW FLASH 4 5CH LOW FLASH 5 6CH LOW FLASH 6 7CH LOW FLASH 7 8CH LOW FLASH 8 9CH LOW FLASH 9 10CH LOW FLASH the above case 11CH LOW FLASH 0 12CH LOW FLASH 13CH LOW REDIAL 1 14CH LOW REDIAL 2 15CH LOW REDIAL 3 16CH LOW REDIAL 4 17CH LOW REDIAL 5 18CH LOW REDIAL 6 19CH LOW REDIAL 7 20CH LOW ...

Page 38: ...ck Flowchart Details of confirmation items are following in Check Table for RF Block P 39 Note DSP is IC201 for Base Unit DSP is IC201 for Handset Both of RF Blocks for Handset and Base Unit are same 38 KX TG2257BXS ...

Page 39: ... 192 MHz at OSC 5 1 Set Test mode Just entering to test mode 3 2 Confirm oscillate signal of RF UNIT 8 192 MHz at OSC 6 Check point 1 Check Xtal oscillator at Q260 C of the base unit 2 Check DSP interface IC101 DSP BS 4 1 Check Xtal oscillator at Q204 C of the handset 2 Check DSP interface IC101 DSP HS 4 3 TX Power confirmation Procedure 1 Put RF wire to ANT and ANT_GND See Base Unit Reference Dra...

Page 40: ...10 9 5 RF DSP interface signal wave form 40 KX TG2257BXS ...

Page 41: ... RF Unit P 36 10 12 Check Caller ID Cross Reference Telephone Line Interface P 56 Calling Line Identification Caller ID Call Waiting Caller ID P 59 Note Make sure the format of the Caller ID or Call Waiting 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 41 KX TG2257BXS ...

Page 42: ...11 TEST MODE 11 1 Test mode flow chart for Base Unit 1 It shows whether the telephone line is connected or not ON OFF HOOK OFF ON HOOK 42 KX TG2257BXS ...

Page 43: ...11 2 TAM Test mode flow chart 43 KX TG2257BXS ...

Page 44: ...entering the Test mode 2 See Adjustment Battery Low Detector Voltage P 45 11 4 X201 Check The confirmation is made under the TX Power Check mode of TEST MODE Equipment Frequency counter TP for measurement TP_ANT Measure range 2472 64550 MHz 5 kHz 1ch at Test Standby mode in TEST MODE P 42 44 KX TG2257BXS ...

Page 45: ...pply 2 Enter the test mode Refer to Test mode flow chart for Handset P 44 3 Follow to Batt Low Check mode CW Tx High is displayed on LCD 4 Set 3 5V for DC power supply Note Check voltage at battery connector because some voltage drop is happened using long or thin cable 5 Press key to write voltage value in EEPROM 6 Turn power off Then this value is available 45 KX TG2257BXS ...

Page 46: ...0 C401 ANT2 TP_OSC GRE ANS STP SKIP MSG REP SPP2 SPM2 ERS 1 2 3 4 7 LCT 5 8 0 DWN 6 RDL MICP MICM FLS 9 UP MIC SP HLD RNG TTSVCC DCP LA LB DCM ANTG2 LED202 C723 LED201 AF VOLT METER SP OUT 8W AF OSC 2 AF OSC 1 AF OSC 2 SP_PHONE Receiving MIC Signal Input Intercom SP phone MIC AF VOLT METER OSCILLOSCOPE Bell SIMULATOR LOOP SIMULATOR 400W 600W DC 9V CALLER_ID SIMULATOR FREQUENCY COUNTER 2 TP_OSC for...

Page 47: ...METER MONITOR SP 8 OSCILLOSCOPE OSCILLOSCOPE FREQUENCY COUNTER 2 AC VOLT METER HEADSET 150 150 OSC 1 1kHz OPEN SPP MIC1 SP1 OSC SPM AC VOLT METER HANDSET 10 OSCILLOSCOPE 10 10 OSC 1 1kHz DC 3 9V MIC LOAD for DC POWER SUPPLY MIC_H MIC_P SPM SPP Test ANTG ANT SPECTRUM ANALYZER Note 2 is refered to No 2 of Check Table for RF Block P 39 KX TG2257BXS 47 ...

Page 48: ...2476 28550 26 2418 94250 7 2476 80225 27 2429 18325 8 2477 31250 28 2429 69675 9 2477 82600 29 2430 20700 10 2478 33625 30 2430 72050 11 2478 84975 31 2431 23075 12 2479 36000 32 2431 74425 13 2479 87350 33 2432 25450 14 2411 77625 34 2433 79175 15 2412 28975 35 2434 30200 16 2412 80000 36 2434 81550 17 2413 31350 37 2435 32575 18 2413 82375 38 2435 83925 19 2414 33725 39 2436 34950 20 2414 84750 ...

Page 49: ... sharing as shown in Fig 7 1 slot time of transmission and reception is 1mS Same frequency is used in transmitting and receiving The figure shows an example the frequency of 3ch is used in transmitting between the base unit and handset Fig 7 12 2 1 TDD Frame Format The TDD frame is 2mS in length Each subframe contains 128 bits of 7 8µS duration Each subframe consists of the following four fields A...

Page 50: ...ough filter FL101 then input to DSP IC201 DSP performs ADPCM decoding to convert the signal into the voice signal then it is output to the speaker Transmission The voice signal input from the microphone is led to DSP IC201 The DSP generates ADPCM signal As well as the reception it is converted into the RF signal by RFIC IC101 Passing through filter FL101 it is transmitted from the antenna As for t...

Page 51: ...13 1 Calling 13 2 To Terminate Communication 13 3 Ringing 13 4 Ports for Transmitting and Receiving of Data 13 EXPLANATION OF BBIC Base Band IC DATA COMMUNICATION 51 KX TG2257BXS ...

Page 52: ...SEG3 STB5 STB4 STB3 STB2 STB1 NEW MSG_LED VMOD BMC CLOCK 8 192MHz RSTH PCTRL CLK DATA LE RXEN TXEN RX GAIN SHCTRL RSSI RXDATA RXI Key Scan DTMF LCD CON Analog SW LCD Key matrex BUF 3 3V 7 5V KX TG2257BXS BLOCK DIAGRAM BASE UNIT 35 27 40 39 26 55 50 14 41 32 47 46 29 31 66 65 58 64 63 66 25 100 62 57 X200 82 83 84 85 86 87 60 3 74 59 81 56 99 98 95 94 93 92 91 90 89 88 18 19 20 21 22 52 51 80 LED20...

Page 53: ... Playback and Line Monitoring modes of operation When the DTMF data from the Handset is received the DTMF signal is output Synthesized Voice Pre recorded message The DSP implements synthesized Voice utilizing the built in speech detector and an FLASH MEMORY which stored the vocabulary Caller ID and Call Waiting CID demodulation The DSP implements monitor and demodulate the FSK signals that provide...

Page 54: ...tage to each block as shown below 15 3 1 Charge Circuit The voltage from the AC is supplied to the main charge circuits Normal charge 90 mA of maximum 20 hours is started soon after the Handset is placed on the base unit Then it changes to trickle charge 20 mA on the average to prevent from overcharging Normal charge Q150 is ON Trickle charge Q150 is OFF 54 KX TG2257BXS ...

Page 55: ...he microcomputer when it incorporates an AC adaptor Circuit Operation When the AC Adaptor is inserted into the unit then the voltage is shifted by IC100 D101 and power is supplied to the DSP The set can operate beyond point in the circuit voltage diagram 55 KX TG2257BXS ...

Page 56: ...pen 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 R L1 L2 R30 R31 C16 C17 Q6 DSP BELL BELL When the CPU DSP detects a ring signal Q4 turns on thus providing an off hook condition active DC current flow through the circuit and the following signal flow is for the ...

Page 57: ...tect 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 It is like an Auto Disconnect Circuit ...

Page 58: ...15 9 Signal Route Each signal route is as follows 58 KX TG2257BXS ...

Page 59: ...rom the telephone exchange is sent during the interval between the first and second rings of the bell signal The data from the telephone exchange is a modem signal which is modulated in an FSK Frequency Shift Keying format Data 1 is a 1200 Hz sine wave and data 0 a 2200 Hz sine wave There are two type of the message format which can be received i e the single message format and plural message form...

Page 60: ...new call so he she can use this information to decide whether to take the new call Function The telephone exchange transmits or receives CAS and ACK signals through each voice RX TX route Then FSK data and MARK data pass the following route Telephone Line CN1 A B C11 C12 R14 R15 DSP 39 40 If the unit deems that a telephone connected in parallel is in use ACK is not returned even if CAS is received...

Page 61: ...SET JACK RINGER MIC SPEAKER TO LCD UNIT CALLER ID IC202 EEPROM KEY PAD KEY LEDS 8 192MHz X201 OSC CN203 LCD_ EEPROM_DO VCCPLL VCCPA 2 1 BATT BATT1 BATT2 D214 D216 IC201 DSP TXEN SHCTRL TXO VMOD RSTH RSSI PCTRL RXEN RXI RXDATA RX GAIN SIO_DO SIO_LE SIO_CLK OSC BUFFER AMP Q204 KX TG2257BXS BLOCK DIAGRAM HANDSET 64 65 57 62 100 63 58 23 24 25 59 16 22 27 60 36 23 44 34 29 74 54 55 32 41 50 14 51 52 4...

Page 62: ...ower down detect circuit Ringer Generation Interface circuit RF unit speaker mic LED Key scan LCD Headset 17 1 2 RF unit Mainly voice signal is modulated to RF or it goes the other way 17 1 3 EEPROM IC202 All setting data is stored ex ID code user setting Flash Time Tone Pulse 17 2 Power Supply Circuit Voltage is supplied separately to each block 62 KX TG2257BXS ...

Page 63: ...he base unit 17 4 Ringer and Handset SP Phone DSP 29 31 SP RINGER 17 5 Sending Signal The voice signal from the microphone input to DSP 46 47 CN203 is the headphone jack When the headphone is connected the Q206 detect it The input from the microphone of the handset MIN MIP is cut and the microphone signal from the headphone is input to DSP 36 Also the power for the microphone is supplied from Q211...

Page 64: ...SP 44 HSMIP The signal input to DSP 44 is inverted and output to DSP 34 LOUTO The signal through the headset jack is inverted then output from DSP 34 to drive the speaker When the headset is inserted to the jack the voice signal is cut at the jack so the sound does not come out from the speaker but from the headset only 64 KX TG2257BXS ...

Page 65: ...18 CPU DATA Base Unit 18 1 IC201 65 KX TG2257BXS ...

Page 66: ...19 CPU DATA Handset 19 1 IC201 66 KX TG2257BXS ...

Page 67: ...20 EXPLANATION OF RF UNIT TERMINALS 20 1 IC101 67 KX TG2257BXS ...

Page 68: ...e 1 Tack the flat pack IC to the PCB by temporarily soldering two diagonally opposite pins in the correct positions on the PCB Be certain each pin is located over the correct pad on the PCB 2 Apply flux to all of the pins on the IC 3 Being careful to not unsolder the tack points slide the soldering iron along the tips of the pins while feeding enough solder to the tip so that it flows under the pi...

Page 69: ...22 CABINET AND ELECTRICAL PARTS Base Unit 69 KX TG2257BXS ...

Page 70: ...23 CABINET AND ELECTRICAL PARTS Handset 70 KX TG2257BXS ...

Page 71: ...24 ACCESSORIES AND PACKING MATERIALS 71 KX TG2257BXS ...

Page 72: ...25 TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES 25 1 Base Unit 25 2 Handset 72 KX TG2257BXS ...

Page 73: ...R LCD TAPE 10 PQHS10526Z TAPE PANEL 11 PQHS10527Z TAPE PANEL 12 PQHX11129Z COVER PANEL SHEET 13 PQKE10131Z7 HANGER HOOK LEVER PC ABS HB 14 PQKE10134Z1 HANGER HOOK KNOB POM HB 15 PQKM10547X1 CABINET BODY PS HB 16 PQQT22298Y LABEL TAM 17 PQSA10098X ANTENNA 18 PQSX10204Z KEYBOARD SWITCH DIAL 19 PQSX10205Z KEYBOARD SWITCH TAM 20 PQUS10285Z TORSION SPRING HOOK 21 PQWE10022Z BATTERY TERMINAL 22 PQYF1053...

Page 74: ...9 ERJ3GEYJ103 10k R160 ERJ3GEYJ563 56k R161 ERJ3GEYJ563 56k R200 ERJ3GEYJ101 100 R201 ERJ3GEYJ101 100 R203 ERJ3GEYJ473 47k Ref No Part No Part Name Description Remarks R204 ERJ3GEYJ271 270 R205 ERJ3GEYJ391 390 R206 ERJ3GEYJ821 820 R207 ERJ3GEYJ181 180 R212 ERJ3GEYJ102 1k R213 ERJ3GEYJ102 1k R214 ERJ3GEYJ102 1k R215 ERJ3GEYJ122 1 2k R216 ERJ3GEYJ122 1 2k R217 ERJ3GEYJ394 390k R218 ERJ3GEYJ123 12k R...

Page 75: ...p Ref No Part No Part Name Description Remarks C421 ECUV1H101JCV 100p C422 ECUV1H101JCV 100p C430 ECUV1H471JCV 470p C450 ECEA0JKA101 100 C453 ECUV1H030CCV 3p C723 ECUV1C823KBV 0 082 OTHERS E1 L0CBAB000044 MICROPHONE E2 PQMG10023Z SPACER MIC POS1 PQRPAR390N THERMISTOR S X200 H0J819400004 CRYSTAL OSCILLATOR 26 2 Handset 26 2 1 CABINET AND ELECTRICAL PARTS Ref No Part No Part Name Description Remarks...

Page 76: ...YJ103 10k R270 ERJ3GEYJ104 100k R276 ERJ3GEYJ471 470 R277 ERJ3GEYJ471 470 R278 ERJ3GEYJ104 100k R279 ERJ3GEYJ101 100 Ref No Part No Part Name Description Remarks R280 ERJ3GEYJ182 1 8k R281 ERJ3GEYJ104 100k R302 ERJ3GEYJ180 18 R303 ERJ3GEYJ180 18 R306 ERJ3GEYJ104 100k R318 ERJ3GEYJ331 330 R319 ERJ3GEYJ331 330 R320 ERJ3GEYJ331 330 R321 ERJ3GEYJ331 330 R322 ERJ3GEYJ331 330 R323 ERJ3GEYJ331 330 R324 E...

Page 77: ...SCILLATOR 26 2 3 ACCESSORIES AND PACKING MATERIALS Ref No Part No Part Name Description Remarks A1 PQJA10075Z CORD TELEPHONE A2 PQKE10341Z1 HANGER BELT CLIP PC ABS HB A3 PQKL10035Z3 STAND WALL MOUNT ADAPTOR ABS HB A4 PQLV1BXZ AC ADAPTOR A5 PQQW12672Z QUICK GUIDE for Arabic A6 PQQX13394Z INSTRUCTION BOOK P1 PQPP170Y PROTECTION COVER for Base Unit P2 XZB10X35A02 PROTECTION COVER for Handset P3 PQPK1...

Page 78: ... line 2 This schematic diagram may be modified at any time with the development of new technology 27 2 Handset SCHEMATIC DIAGRAM Handset Note 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 78 KX TG2257BXS ...

Page 79: ...27 3 Memo 79 KX TG2257BXS ...

Page 80: ...28 SCHEMATIC DIAGRAM Base Unit 1 3 4 5 13 14 15 16 18 19 21 22 6 12 IC201 IC101 IC202 IC300 80 KX TG2257BXS ...

Page 81: ...600 1 1kHz 3 2V 7 5V 3 3V 3 6V Input 1 1kHz 140mVp p 25dBm 600 Call ID data Auto Disconnect Circuit 9V DC Charge Circuit KX TG2257BXS SCHEMATIC DIAGRAM Base Unit Reset Circuit IC331 IC100 IC332 1 3 4 5 13 14 15 16 18 19 21 22 6 12 for H S 81 KX TG2257BXS ...

Page 82: ...29 SCHEMATIC DIAGRAM Handset IC202 1 2 3 4 5 6 23 24 26 46 48 49 51 52 27 28 45 53 60 82 KX TG2257BXS ...

Page 83: ...C203 IC205 IC201 IC204 3 3V 3 3V Headset Headset Input 1 1kHz 43dBm 600 Input 1 1kHz 18mVp p 45dBm 600 KX TG2257BXS SCHEMATIC DIAGRAM Handset 1 2 3 4 5 6 23 24 26 46 48 49 51 52 27 53 60 28 45 83 KX TG2257BXS ...

Page 84: ...SSI TXEN SHCTRL 13 1 OSC DEMOD out of use IC101 KX TG2257BXS SCHEMATIC DIAGRAM RF Unit 16 16 11 10 12 15 17 8 9 7 4 3 5 Vpow for Base Unit Vpow2 for Handset SYN_DATA SYN_EN SYN_CLK TXMOD When either Vpow or Vpow2 is in use the other is out of use KX TG2257BXS 84 ...

Page 85: ... Unit IC101 C181 C142 KX TG2257BXS CIRCUIT BOARD RF Unit RXGAIN Vpow TXMOD N C Vpow2 OSC SYN_CLK SYN_DATA SYN_EN TXEN RXEN SHCTRL RSSI RX_DATA RSTN DEMOD ANT 1 2 3 4 5 13 12 11 10 9 8 7 17 16 15 14 GND 18 85 KX TG2257BXS ...

Page 86: ...31 1 MEMO 86 KX TG2257BXS ...

Page 87: ... CIRCUIT BOARD Component View Base UNIT 1 2 3 4 5 7 8 9 10 11 12 13 G G G G G G G G G G G G G G G 15 16 17 14 G G G G G G G Mic input Lout 0 Vcc 3 2V D LINO Bell CHARGE_CTL VRF Vcc 3 3V B MIN CHARGE_DET MIP Reset RST X tal CLK HS MIP Power_DOWN PDN 1 3 0 31 50 5 1 80 81 100 Speaker PBF KX TG2257BXS 87 ...

Page 88: ...52 C150 R154 R156 CHGP CHGM D153 D152 D150 LED205 D4 D109 C20 C401 ANT2 TP_OSC GRE ANS STP SKIP MSG REP SPP2 SPM2 ERS TAM 1 2 3 VCC1 UTX2 PRG AUT URX2 4 7 LCT 5 8 0 DWN 6 TCK TMSTDO RDL TTSIN SOUT VOUT TTSRST SCLK MICP TP_LCT CDL MICM SRDY BUSY SIN FLS TDI 9 UP MIC SP HLD RNG MEMO TTSVCC DCP LA LB DCM ANTG2 LED202 C723 LED201 KX TG2257BXS CIRCUIT BOARD Flow Solder Side View Base Unit KX TG2257BXS ...

Page 89: ...IC203 IC202 IC204 IC205 KX TG2257BXS CIRCUIT BOARD Component View Handset 30 31 50 81 100 51 80 Power Down PDN VCC Reset RST HJ HS SPP SPM MIC1 SP1 Test DSP VDD BATT Low OSC VRF 3 3V MIC_H MIC_H PBF 1 18 1716 1514 13 12 11 10 9 8 7 5 4 3 2 KX TG2257BXS 89 ...

Page 90: ...ED203 LED204 KEY0 KEYSYA R204 R203 LED201 LED202 R202 R201 LED209 LED208 LED210 LED205 LED206 LED207 C206 C207 C208 C209 C210 C211 R217 R216 R205 R301 R218 CN201 R262 R261 R207 C315 C316 C212 C215 Q203 1 22 R206 R313 R314 R311 R312 R215 R214 FLS CWIT RDL PA MIC KX TG2257BXS CIRCUIT BOARD Flow Solder Side View Handset KX TG2257BXS 90 ...

Page 91: ...91 KX TG2257BXS H M KXTG2257BXS ...

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