Panasonic KX-TG6440PK Service Manual Download Page 14

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KX-TG6440PK/KX-TGA641S/KX-TGA641T/KX-TGA740B

4.4.4.

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.
The set starts to operate when VCC goes up to 3.0 V or more in the circuit voltage diagram.

Note:

(*1) The initializing time of the DSP chip is 28 ms under normal conditions.

Summary of Contents for KX-TG6440PK

Page 1: ...g and distribution is a violation of law ORDER NO KM40902809CE F13 Telephone Equipment Model No KX TG6440PK KX TGA641S KX TGA641T KX TGA740B Expandable Digital Cordless Answering System B Black Version S Pearl Silver Version T Black Metallic Version for U S A ...

Page 2: ...2 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B ...

Page 3: ... How to Replace the Handset LCD 69 12 Measurements and Adjustments 70 12 1 Things to Do after Replacing IC or X tal 70 12 2 Base Unit Reference Drawing 71 12 3 Handset Reference Drawing 72 12 4 Frequency Table 73 13 Miscellaneous 74 13 1 CPU Data Base Unit 74 13 2 CPU Data Handset 75 13 3 Explanation of IC Terminals RF Part 76 13 4 How to Replace the Flat Package IC 77 13 5 How to Replace the LLP ...

Page 4: ...e Dispose of used batteries according to the instructions 2 2 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 con tains lead We will use PbF solder when discussing the lead free solder used in our manufacturing process which is made from Tin Sn Silver Ag and Copper Cu This model a...

Page 5: ... Zinc and Bismuth Sn Zn Bi Please check the manufac turer s specific instructions for the melting points of their products and any precautions for using their product with other materi als The following lead free PbF solder wire sizes are recommended for service of this product 0 3 mm 0 6 mm and 1 0 mm 2 3 Discarding of P C Board When discarding P C Board delete all personal information such as te...

Page 6: ...e Design and specifications are subject to change without notice Note for Service Optional headset KX TCA60 KX TCA86 KX TCA92 KX TCA93 KX TCA94 Operation range Up to 300 m outdoors Up to 50 m indoors depending on the condition Analog telephone connection Telephone Line ...

Page 7: ...10 ms of voice data is transmitted 2 Handsets Link Traffic Bearer A link is established between base unit and handset The state where duplex communication is performed Handset doesn t make up duplex in no free RF channels because of interference 1 Dummy Bearer Base unit sends Dummy data to the all stand by state handsets Handsets receive that data for synchronization and monitoring request from th...

Page 8: ...gnal in the selected antenna and demodulates it to digital data RXDATA DSP IC501 converts RXDATA into a voice signal and outputs it to speaker Transmission A voice signal from microphone is encoded to digital data TXDATA by DSP IC501 in a handset Then TXDATA goes to RF PART and it s modulated to 1 9 GHz The RF signal is amplified and fed to a selected antenna As for a base unit RF RF signal is rec...

Page 9: ... DETECT CHARGE Q361 Q362 LIN LOUT RF_PART CID_IN CID_IN IC501 DSP MIN INUSE DETECT 2 INUSE DETECT 1 RECEIVE AMP DCIN 1 DCIN 2 IC331 RESET POWER_DOWN VCCIN VCC VCCA VCCPA INT_1 CHARGE_DET V_RF INT_1 5 VCC ANSWER_LED IC601 FLASH MEMORY KEYS R151 R152 R131 R133 Q171 V_PA DVCC SI SO CS MSG_LED SP_LED KEY 1 3 KEY B C D E SPN SPP MIP 3 3 V REGULATOR IC321 3 0 V REGULATOR with RESET CLK RST R371 R372 R37...

Page 10: ... DVCC Note 1 Antenna Type wired monopole antenna KX TG6440 BLOCK DIAGRAM Base Unit_RF Part PLL 13 824 MHz IC701 ANT2 1 ANT1 1 Control Logic Mixer A D Demodulator delta sigma Modulator D781 D771 BCLK SYN_OUT SYN_EN SYN_CLK SYN_DATA SLOT_CTROL RADIO_EN TXDATA RXDATA RF_RSTN Divider 1 5 DSP IC501 ...

Page 11: ...messages from the Flash Memory DTMF Generator 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 a Flash Memory which stored the vocabulary Caller ID demodulation The DSP implements monitor and demodulate the FSK DTMF signals that provide CID information fro...

Page 12: ... TGA641S KX TGA641T KX TGA740B 4 4 3 Power Supply Circuit Function The power supply voltage from AC adaptor is converted to the desired voltage of each block Circuit Operation IC321 3 0 V Regulator IC331 3 3 V Regulator ...

Page 13: ...13 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 4 4 3 1 Charge Circuit The voltage from the AC adaptor is supplied to the charge circuits ...

Page 14: ...n 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 The set starts to operate when VCC goes up to 3 0 V or more in the circuit voltage diagram Note 1 The initializing time of the DSP chip is 28 ms under normal conditions ...

Page 15: ...1 Q111 DSP pin 58 BELL When the CPU DSP detects a 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 R167 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 condit...

Page 16: ...s or OGM transmitting status Circuit Operation The voltage of pin 90 of IC501 is monitored If a parallel connected telephone is put into OFF HOOK status the presence absence of a parallel connection is determined when the voltage changes by 0 2 V or more When the set detects the parallel connected telephone is OFF HOOK status the line is disconnected You can enable or disable the Auto Disconnect f...

Page 17: ...hone con nected in parallel is on hook or off hook by detecting changes in the T R voltage Circuit Operation Parallel connection detection when on hook When on hook the voltage is monitored at pin 86 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 ...

Page 18: ...d The data for the caller ID from 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 is a 2200 Hz sine wave There are two types of the message format which can be received i e the single mess...

Page 19: ...r is alerted to the 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 CN101 T R P101 L101 L102 C121 C122 R121 R122 IC501 89 88 If the unit deems that a telephone connected in parallel is in use ...

Page 20: ...YIN_1 5 Q531 CHARGE DETECT CHARGE Q361 D361 Q362 Q364 CHARGE CONTROL RST IC561 DC DC CONVERTER REGULATOR 2 7 V IC741 REGULATOR MIC SP Headset Jack CN431 R436 R437 LED561 HEADSET DETECT Monitor SP LCD KEYS RF part ANT1 ANT2 X501 13 824 MHz EEPROM BATTERY Q561 LCD BACK LIGHT RST BELL IC372 DC DC CONVERTER IC373 DC DC CONVERTER SYN_OUT SYN_EN SYN_CLK SYN_DATA SLOT_CTROL RADIO_EN TXDATA RXDATA RF_RSTN...

Page 21: ... unit and handset in Radio parts ANT1 patterned antenna KX TGA641 BLOCK DIAGRAM Handset_RF Part ANT2 wired monopole antenna PLL 13 824 MHz IC701 ANT2 1 ANT1 1 Control Logic Mixer A D Demodulator D781 D771 BCLK SYN_OUT SYN_EN SYN_CLK SYN_DATA SLOT_CTROL RADIO_EN TXDATA RXDATA RF_RSTN Note delta sigma Modulator DSP IC501 Divider 1 5 ...

Page 22: ... 1 DSP IC501 Function Battery Low Power down detect circuit Ringer Generation Interface circuit RF part Speaker Mic LED Key scan LCD Headset Initial waves Note 1 The initializing time of the DSP chip is 20 ms under normal conditions 4 7 1 2 RF part Mainly voice signal is modulated to RF or it goes the other way 4 7 1 3 EEPROM IC541 Setting data is stored ex ID code user setting ...

Page 23: ...23 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 4 7 2 Power Supply Circuit Voltage is supplied separately to each block ...

Page 24: ...Q361 The voltage between CHARGE and CHARGE flows Q531 pin 38 of IC501 where the charge is detected Then IC501 calculates the battery consumption amount from the previous charge and it controls Q361 Q362 Q364 by pin 42 of IC501 until charging is complete When charging is complete the control pattern is switched to Trickle charging form from Operational charging form Charging form 4 7 4 Ringer and H...

Page 25: ...om the headset is input to DSP 95 Also the power for the microphone is supplied from DSP 92 and the power is turned OFF on standby 4 7 6 Reception Signal The voice signal from the base unit is output to DSP 98 This signal is led to the headset jack CN431 The signal through the headset jack and the other signal output from DSP 97 drives the speaker When the headset is inserted to the jack the voice...

Page 26: ... voice data that come from DSP are modulated and are transmitted On the other hand received signals are demodulated and go out to DSP 4 8 1 Antenna switch Circuit IC701 controls D771 by TRSW TRSW_n signals and carries out the switching of TX mode RX mode In the same way IC701 con trols D781 by ANT ANT_n signals and carries out the switching of Antenna1 ANT1 Antenna2 ANT2 ...

Page 27: ...lied to the charge circuits Main charge 220 280 mA at the Battery of maximum 7 hours is started soon after the handset is placed on the charger unit Then it changes to Trickle charge to prevent from over charging Charging form The route for this is as follows DC pin of J1 F1 D1 R1 CHARGE pad Handset CHARGE pad DC pin of J1 ...

Page 28: ...28 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 4 10 Signal Route ...

Page 29: ...29 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B RF part signal route ...

Page 30: ...30 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 5 Location of Controls and Components 5 1 Controls 5 1 1 Base Unit 5 1 2 Handset ...

Page 31: ...31 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 5 2 Display ...

Page 32: ...32 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 6 Installation Instructions 6 1 Connections 6 2 Battery 6 2 1 Battery Installation ...

Page 33: ...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 2 3 Battery Level 6 2 4 Panasonic Ni MH Battery Performance supplied batteries ...

Page 34: ...34 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 7 Operating Instructions 7 1 Programmable Settings 7 1 1 Programming by Scrolling through the Display Menus ...

Page 35: ...35 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B ...

Page 36: ...36 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 7 1 2 Programming using the Direct Commands ...

Page 37: ...37 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B ...

Page 38: ...38 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 7 2 Error Messages ...

Page 39: ...39 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 7 3 Troubleshooting ...

Page 40: ...40 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B ...

Page 41: ...41 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B ...

Page 42: ...42 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B ...

Page 43: ...43 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 8 Test Mode 8 1 Adjustment and Test Mode Flow Chart 8 1 1 TX CW Mode for Base Unit Note 1 Refer to Check Table for RF part P 60 ...

Page 44: ...GA641T KX TGA740B 8 1 2 Test Link Mode for Base Unit Note 1 Refer to Test Link Mode for Handset P 48 If you can not proceed to the next step refer to Registering a Handset to a Base Unit P 58 2 Refer to Check Table for RF part P 60 ...

Page 45: ...45 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 8 1 3 Adjustment Mode for Base Unit Cross Reference Check and Adjust Frequency Base Unit P 70 ...

Page 46: ...46 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 8 1 4 TX CW Mode for Handset Note 1 LCD displays the Channel number exception default CH00 0ch 2 Refer to Check Table for RF part P 60 ...

Page 47: ...47 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 8 1 5 RX CW Test Mode for Handset Note 1 LCD displays the Channel number exception default CH00 0ch 2 Refer to Check Table for RF part P 60 ...

Page 48: ...LCD displays the Channel number exception default CH00 0ch 2 If can not proceed to the next step refer to Registering a Handset to a Base Unit P 58 3 for factory use only 4 Refer to Check Table for RF part P 60 5 Operation for regular base unit Refer to CHART1 in the TEST RANGE Check P 61 ...

Page 49: ...S KX TGA641T KX TGA740B 8 1 7 Adjustment Mode for Handset Cross Reference 1 Adjust Battery Low Detector Voltage Handset P 70 Note 2 These are the default values 3 These values may not be fixed depending on the battery strength ...

Page 50: ... 9 Service Mode 9 1 How to Clear User Setting Units are reset to the Factory settings by this operation Erase recorded Voice messages stored Phone numbers Caller list and etc This operation should not be performed for a usual repair 9 1 1 Base Unit ...

Page 51: ...51 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 9 1 2 Handset 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 ...

Page 52: ...ry Charge P 55 Check Link P 56 Check the RF part P 57 Check Handset Transmission P 64 Check Handset Reception P 64 Check Caller ID P 64 Note 1 When a user claims that the unit disconnects a call right after the greeting message and no incoming messages can be recorded this symptom can not be reappeared with TEL simulator in the service center In this case try Check Record P 54 item B C ...

Page 53: ...0B 10 1 1 Check Power Cross Reference Power Supply Circuit P 12 Reset Circuit P 14 Note Flash Memory is IC601 DSP is IC501 1 Refer to Specifications P 6 for part number and sup ply voltage of AC adaptor 2 Refer to Circuit Board Base Unit_Main P 95 ...

Page 54: ...makes easier to detect a small voice caller by raising the sensitivity of VOX level Therefore the recording of TAM is not turned off during a detection Cross Reference Signal Route P 28 Telephone Line Interface P 15 Auto Disconnect Circuit P 16 Parallel Connection Detect Circuit P 17 Note Flash Memory is IC601 DSP is IC501 If successful a long beep sounds If the STOP key is pressed stand by mode i...

Page 55: ...yback Cross Reference Power Supply Circuit P 12 Note Flash Memory is IC601 DSP is IC501 1 Refer to Circuit Board Base Unit_Main P 95 10 1 4 Check Battery Charge Note Flash Memory is IC601 1 Refer to Specifications P 6 for part number and supply voltage of AC adaptor ...

Page 56: ...56 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 10 1 5 Check Link Note Flash Memory is IC601 DSP is IC501 1 Refer to Finding out the Defective part P 57 Cross Reference Check the RF part P 57 ...

Page 57: ...1T KX TGA740B 10 1 6 Check the RF part 10 1 6 1 Finding out the Defective part After All the Checkings or Repairing 1 Re register the checked handset to the checked base unit and Regular HS to Regular BU Note 1 HS Handset 2 BU Base Unit ...

Page 58: ...58 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 10 1 6 1 1 Registering a Handset to a Base Unit 10 1 6 1 2 Deregistering a Handset 10 1 6 1 3 Deregistering All Handsets by the Base Unit ...

Page 59: ...1S KX TGA641T KX TGA740B 10 1 6 2 RF Check Flowchart Each item 1 6 of RF Check Flowchart corresponds to Check Table for RF part P 60 Please refer to the each item Note 1 Refer to Things to Do after Replacing IC or X tal P 70 ...

Page 60: ... Mode Test RX Mode BU HS Mode Test TX_Burst Mode 1 Place Regular HS 15 cm away from a checked BU 2 Confirm TXDATA waveform of BU 6 and RXDATA waveform of Regular HS by Digital Oscilloscope 1 Place Regular BU 15 cm away from a checked HS 2 Confirm TXDATA waveform of HS 5 and RXDATA waveform of Regular BU by Digital Oscilloscope 5 RX confirmation Regular HS BU Mode Test TX_Burst Mode BU HS Mode Test...

Page 61: ...20 m between HS and BU Link OK TX Power of the HS is OK No Link TX Power of the HS is NG Range Confirmation RX TEST RX sensitivity check HS BU Mode Test Link Mode 1 1 Register Regular 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 5 m between HS and BU Link OK RX Sensitivit...

Page 62: ... TRSW_n Signal BS HS BS HS SLOT_CTRL 22 19 21 RADIO_EN 21 24 26 TRSW TRSW_n 11 TRSW 6 TRSW signal of RX zone in TX_Burst mode SLOT_CTRL RADIO_EN IC701 TRSW_n Signal BS HS BS HS SLOT_CTRL 22 19 21 RADIO_EN 21 24 26 TRSW TRSW_n 11 TRSW 6 IC501 IC501 IC501 DSP IC IC501 RF IC IC701 DSP IC IC501 RF IC IC701 10mS 1µs 10mS 10mS 500µ 500µ SLOT_CTRL RADIO_EN TRSW_n TRSW SLOT_CTRL RADIO_EN TRSW_n TRSW SLOT_...

Page 63: ...line RX Confirmation of BS or TX confirmation of HS Base Unit TXDATA and Handset RXDATA on TXO signal line TX Confirmation of BS or RX confirmation of HS Handset RXDATA Base Unit TXDATA Handset RXDATA Base Unit TXDATA Base Unit RXDATA Handset TXDATA Base Unit RXDATA Handset TXDATA 10ms 9µs 10ms 9µs ...

Page 64: ...en checking the RF part Refer to Check the RF part P 57 10 1 9 Check Caller ID Cross Reference Telephone Line Interface P 15 Calling Line Identification Caller ID Call Waiting Caller ID P 18 Note Make sure the format of the Caller ID service of the Tele phone company that the customer subscribes to It is also recommended to confirm that the customer is really a subscriber of the service ...

Page 65: ...65 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 11 Disassembly and Assembly Instructions 11 1 Disassembly Instructions 11 1 1 Base Unit ...

Page 66: ...66 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B ...

Page 67: ...67 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 11 1 2 Handset ...

Page 68: ...68 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 11 1 3 Charger Unit ...

Page 69: ...69 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 11 2 How to Replace the Handset LCD ...

Page 70: ...824 MHz 30 Hz 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 for Handset P 49 12 1 4 Adjust Battery Low Detector Voltage Handset After handset s DSP IC501 or EEPROM IC541 replacement Re writing Battery Low voltage to EEPROM is required With following handset Adjustment Flow adjust DC power supply and DC...

Page 71: ... UTX BCLK URX 3 4 50 51 25 26 1 100 75 JO JI JS JC 76 INT1 KEY B 1 2 3 TE MIC MIP MIN A HSOUT 1 UVCC C501 C503 C504 IC501 TEL DC RED RED RED WHT BLK BLK YEL GRN T R RING L1R L1T DCM2 DCP DCP2 DCM PNLB1089Z PbF VCC JG KEY_GND C102 C101 C115 C116 R115 D101 C515 C516 C519 C459 C352 RA452 C458 C457 C476 R592 R591 R593 R594 C469 R156 L372 IC321 D143 D142 Q161 Q156 C321 C142 C162 C163 C152 R322 R321 R37...

Page 72: ...IC741 RA401 RA402 RA552 RA501 RA551 RA403 D413 D412 D771 Q361 Q364 Q543 Q390 C362 F301 C531 C353 C363 C436 C432 C435 CN431 C371 C541 C519 C511 C391 C512 C533 C534 C535 C532 C522 C521 C520 C526 C544 C501 C510 C596 CI C514 C540 C755 C772 C781 C797 C796 C793 C791 C782 C711 C712 C722 C714 C721 C777 C776 C758 C701 C753 C752 C761 C773 C756 R367 R368 R369 R363 R366 R431 R437 R436 R417 R434 R374 R371 R542...

Page 73: ... KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 12 4 Frequency Table Ch hex TX RX Frequency MHz Channel 0 00 1928 448 Channel 1 01 1926 720 Channel 2 02 1924 992 Channel 3 03 1923 264 Channel 4 04 1921 536 ...

Page 74: ...ormal WakeUp 39 NC D O 40 NC D O 41 NC D O 42 NC D O 43 NC D O 44 NC D O 45 NC D O 46 GND GND GND 47 VCC VCC VCC 48 NC INT0 D I O 49 FLASH_SCK High Middle Low 50 NC D O 51 KEY_STB_E D O Active Not 52 KEY_STB_D D O Active Not 53 KEY_STB_C D O Active Not 54 KEY_STB_B D O Active Not 55 KEY_STB_A D O 56 NC D O 57 NC D O 58 BELL D I OFF ON 59 RLY D O Off Hook On Hook 60 KEY_IN6 D I Non Key In 61 KEY_IN...

Page 75: ... SID D O 48 GND7 GND 49 VCC2 VCC 50 RESET D O Nonactive Active 51 FL_CLK D O 52 CI D O 53 NC D O 54 NC D O 55 ANT_LED D O Active Nonactive 56 A0 D O 57 NC D O 58 NC D O 59 LCD_POWER D O Active Nonactive 60 NC D O 61 CS1 D O 62 NC D O 63 KEYSTROBE_E D O Nonactive Active 64 KEYSTROBE_D D O Nonactive Active 65 KEYSTROBE_C D O Nonactive Active 66 KEYSTROBE_B D O Nonactive Active 67 KEYSTROBE_A D 0 Non...

Page 76: ...76 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 13 3 Explanation of IC Terminals RF Part 13 3 1 IC701 ...

Page 77: ...Note See About Lead Free Solder PbF Pb free P 4 13 4 2 How to Remove the IC 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 first and then cut off the pins thoroughly 3 While the solder m...

Page 78: ...curacy of the IC setting with the corresponding 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 13 4 4 How to Remove a Solder Bridge 1 Lightly resolder the bridged portion 2 Remove the remaining solder along the pins using a soldering iron as shown in the figure below ...

Page 79: ...B foil Hot Air Desoldering Tool Temperature 608 F 68 F 320 C 20 C 13 5 2 Caution To replace the IC efficiently choose the right sized nozzle of the hot air desoldering tool that matches the IC package Be careful about the temperature of the hot air desoldering tool not to damage the PCB and or IC 13 5 3 How to Remove the Shield Case Note If you don t have special tools ex Hot air disordering tool ...

Page 80: ...ndings 13 5 5 How to Remove the IC 1 Heat the IC with a hot air desoldering tool through the P C Board 2 Pick up the IC with tweezers etc when the solder is melted completely Note Be careful not to touch the peripheral parts with tweezers etc They are unstable When it is hard to melt the solder completely heat it with a hot air desoldering tool through the IC besides through the P C Board 3 After ...

Page 81: ...cing the IC the positioning should be done very carefully 3 Heat the IC with a hot air desoldering tool through the P C Board until the solder on IC bottom is melted Note Be sure to place it precisely controlling the air volume of the hot air desoldering tool 4 After soldering confirm there are no short and open circuits with visual inspection 13 5 7 How to Remove a Solder Bridge When a Solder Bri...

Page 82: ...82 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 13 6 Terminal Guide of the ICs Transistors and Diodes 13 6 1 Base Unit 13 6 2 Handset 13 6 3 Charger Unit ...

Page 83: ...at any time with the development of new technology 14 1 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 may be modified at any time with the development of new technology 14 1 3 Charger Unit Schematic Diagram Charger Unit Notes 1 DC voltage measurements are taken with voltmeter from the negat...

Page 84: ...C685 NC C686 NC C687 NC C688 NC C689 NC C509 10p C508 10p C611 NC NC L478 NC L479 100 R322 140 R321 1k R178 WBX03 2pin 10u C322 1u C383 10p C477 10p C478 10p C185 13 824MHz X501 4 NC TXMOD 5 NC1 6 XIN 7 XOUT 8 VDD 9 VCCIN 10 GND1 11 RSTN 12 FLASH_RE 13 FLASH_SO 14 FLASH_SI 15 FLASH_CS 16 NC2 17 SYN_OUT 18 TX_DATA 19 SLOT_CTRL 20 NC3 21 NC4 22 NC5 29 SYN_CLK 30 SYN_DATA 31 NC8 32 NC9 33 FCCP15 34 R...

Page 85: ...K R362 NC NC L372 R375 0 L362 NC C331 K0 47u 100k R172 K1 0u C342 K0 01u C152 10M R151 D301 390 R181 56 R182 C181 0 1u 27 R167 22 R171 82 R160 12 R163 2 7k R164 820 R168 C184 K1 0u 1000p C172 C169 NC NC C170 680p C121 680p C122 100k R111 100k R112 R131 10M R3630 D143 25V 3 3M R152 R365 1k 680p C101 680p C102 NC C116 NC C115 Q141 B E C 50 10u C161 C174 NC 0 022u C178 C179 NC C361 1000p C113 K0 68u ...

Page 86: ...C771 NC C761 D10p C773 NC C791 NC C795 D10p C782 D10p C781 ANT1 ANT2 B1 5p C776 J33p C772 B1 8p C777 B1 8p C775 10p C793 10p C797 C765 10p 5 6nH L754 0 L795 0 L791 D781 1 2 3 D771 1 2 3 0 5p C796 NC C792 560 L796 560 L797 560 L798 NC R782 NC R771 B1 8p C764 0 5p C762 NC R781 NC No Components 1 2 3 4 5 6 ...

Page 87: ...752 D10p C701 D10p C703 D10p C705 D10p C707 D10p C711 K1uF C708 NC L739 C713 NC ZA1 1 2 3 4 4 7n L751 4 7n L753 18n L752 NC C758 IC701 1 VCC_VCO 2 PAEN 9 TX_p 3 ATST_p 4 ATST_n 5 ANT_n 6 TRSW 7 Rxp 8 Rxn 10 TX_n 11 TRSW_n 12 ANT 13 VCC_FE 14 VDD_IF 15 VCC_IF 16 VDD_DIG_b 17 VCC_DIG 18 RSTN 19 VCC_IO 20 TR_DATA 21 RADIOEN 22 SLOT_CTRL 23 SYN_DAT 24 SYN_CLK 25 SYN_EN 26 SYN_OUT 27 VDD_DIG_t 28 DTEST...

Page 88: ...2 REDIAL 1 2 2 1 2 9 1 2 CONF 1 2 6 1 2 FLS 1 2 3 1 2 0 1 2 1 2 7 2 1 MUTE 1 2 4 2 1 SHA 1 2 ANS2 1 2 STOP 2 1 ERASE 1 2 HOLD 1 2 SP2 1 2 MSG2 1 2 MSG1 1 2 SKIP 1 2 DOWN 1 2 RPT 1 2 UP 1 2 LOCAT INT 1 2 LED902 A K LED901 A K LED904 A K NC C901 NC R901 NC R902 MIC MIC MIC 1 2 SP_LED KEYIN6 KEYIN4 KEYIN5 KEYS_A 2APVCC KEYS_E KEYS_B KEYIN1 MEG_LED KEYS_C ANS_LED KEYS_D KEYIN3 KEYIN2 ...

Page 89: ...89 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B Memo ...

Page 90: ...DI 17 FL_CS 18 NC 19 SYN_OUT 20 TX_DATA 21 SLOT_CTRL 22 NC 29 VCC1 30 SYN_EN 31 SYN_CLK 32 SYN_DATA 33 NC4 34 TX_EN 35 KEY_BL_LED 36 RX_DATA 37 NC 38 CHG_DET 39 NC 40 LCD_BACK_LIGHT 41 NC 42 CHG_CTL 43 NC 44 DB 45 DB 46 DB6 SCL 47 DB7 SID 54 NC 55 ANT_LED 56 A0 57 NC 58 NC 59 LCD_POWER 60 NC 61 CS1 62 NC 63 KEYSTB_E 64 KEYSTB_D 65 KEYSTB_C 66 KEYSTB_B 67 KEYSTB_A 68 GND8 69 VCC3 70 TCK 71 TMS 72 T...

Page 91: ...NE 1 2 2 7V GND_0 GND_0 GND_0 GND_0 GND_0 GND_0 GND_0 GND_0 C423 NC C424 NC GND_0 R380 NC GND_0 2 7V GND_0 GND_0 GND_0 GND_0 GND_0 3 1V D426 D427 D423 D424 47 R371 K0 022u C415 K0 022u C414 K1000p C416 MICP SPM VBAT VSS MICM SPP RX TX K1 0 C421 K1 0 C371 K1 0 C372 MIC 1 2 10p C520 10p C521 10p C522 0 R600 10p C523 V_BAT1 NC R390 NC R391 NC R392 NC C390 NC Q390 NC C391 NC R393 NC 4 VSS 3 NC 1 OUT 2...

Page 92: ...10p C771 NC C761 D10p C773 NC C791 NC C795 D10p C782 D10p C781 B1 8p C775 B1 8p C777 B1 5p C776 J33p C772 ANT2 D10p C793 D10p C797 10p C765 5 6nH L754 0 L791 0 L795 D781 1 2 3 D771 1 2 3 0 5p C792 NC C796 560 L798 NC R781 NC R782 560 L797 560 L796 NC R771 1 8p C764 0 5p C762 1 2 3 4 5 6 NC No Components ...

Page 93: ...p C752 D10p C701 D10p C703 D10p C705 D10p C707 D10p C711 K1uF C708 NC L739 4 7n L751 4 7n L753 ZA1 1 2 3 4 NC C758 18n L752 1 VCC_VCO 2 PAEN 9 TX_p 3 ATST_p 4 ATST_n 5 ANT_n 6 TRSW 7 Rxp 8 Rxn 10 TX_n 11 TRSW_n 12 ANT 13 VCC_FE 14 VDD_IF 15 VCC_IF 16 VDD_DIG_b 17 VCC_DIG 18 RSTN 19 VCC_IO 20 TR_DATA 21 RADIOEN 22 SLOT_CTRL 23 SYN_DAT 24 SYN_CLK 25 SYN_EN 26 SYN_OUT 27 VDD_DIG_t 28 DTEST 29 DTST1 3...

Page 94: ...94 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 14 7 Schematic Diagram Charger Unit J1 2 1 TP3 G TP2 TP1 TP4 R1 10 D1 A K F1 SCHEMATIC DIAGRAM Charger Unit ...

Page 95: ...9 D341 Q171 Q362 Q361 C164 C474 C471 C160 C167 C143 C141 C132 C113 R113 R133 R144 R145 R142 R168 R122 R121 R131 D113 A Q142 C120 C479 C343 C121 C122 C114 C111 C112 R114 R111 R112 Q111 SHIELD C456 C518 C451 C517 C151 C514 C601 C603 C605 C611 C612 C513 C604 R421 R611 R612 R602 R603 R533 R134 R154 R521 L501 RA451 C672 C687 C688 C689 C684 C685 C686 C662 C674 C660 C671 C661 C185 C521 C454 C455 C452 C33...

Page 96: ...5 26 1 100 75 JO JI JS JC 76 INT1 KEY B 1 2 3 TE MIC MIP MIN A HSOUT 1 UVCC C501 C503 C504 IC501 TEL DC RED RED RED WHT BLK BLK YEL GRN T R RING L1R L1T DCM2 DCP DCP2 DCM PNLB1089Z PbF VCC JG KEY_GND C102 C101 C115 C116 R115 D101 C515 C516 C519 C459 C352 RA452 C458 C457 C476 R592 R591 R593 R594 C469 R156 L372 IC321 D143 D142 Q161 Q156 C321 C142 C162 C163 C152 R322 R321 R375 R361 R363 R151 R152 R16...

Page 97: ...5 C792 C757 C751 C708 C703 C704 C702 C705 C706 C764 C762 C754 R772 R771 R736 R731 R732 R715 L751 L791 L754 L796 L739 D771 C755 C772 C781 C797 C796 C793 C791 C782 C711 C712 C722 C714 C721 C777 C776 C758 C701 C753 C752 C761 C773 C756 R782 R781 L753 L798 L795 L752 L797 L721 D781 KX TG6440 CIRCUIT BOARD Base Unit_RF Part Component View ...

Page 98: ...C KEYS_B MEG_LED SP_LED KEYIN2 KEYS_D KEYIN3 KEYIN1 KEYIN5 KEYIN6 KEYIN4 ANS_LED 2APVCC ANS2 LOCAT INT A DOWN MIC MIC MIC R902 R901 C901 LED901 SKIP MSG2 MSG1 RPT UP KX TG6441H PNLB1091Z PbF LED902 LED904 KX TG6440 CIRCUIT BOARD Base Unit_Operation Component View 1 2 3 4 5 6 7 8 9 REDIAL HOLD SP2 0 MEMO CONF MUTE FLS ...

Page 99: ...3 D413 D412 D771 Q361 Q364 Q543 Q390 C362 F301 C531 C353 C363 C436 C432 C435 CN431 C371 C541 C519 C511 C391 C512 C533 C534 C535 C532 C522 C521 C520 C526 C544 C501 C510 C596 CI C514 C540 C755 C772 C781 C797 C796 C793 C791 C782 C711 C712 C722 C714 C721 C777 C776 C758 C701 C753 C752 C761 C773 C756 R367 R368 R369 R363 R366 R431 R437 R436 R417 R434 R374 R371 R542 R380 R507 R506 R505 R509 R543 R508 R393...

Page 100: ...KX TGA740B 15 4 2 Bottom View KX TGA641 CIRCUIT BOARD Handset_Main Bottom View 1 2 CN3 12 1 OTP 3 SP DOWN FLASH LEFT MENU RIGHT TALK UP OFF 4 5 6 7 MIC 8 9 LED553 LED552 LED554 LED557 LED561 W_LED W_LED LED556 LED555 LED559 LED558 LED551 0 ...

Page 101: ...8 C703 ATSTp C704 C702 C705 C706 C764 C762 C754 R772 R771 R736 R731 R732 R715 L751 L791 L754 L796 L739 D771 C755 C772 C781 C797 C796 C793 C791 C782 C711 C712 C722 C714 C721 C777 C776 C758 C701 C753 C752 C761 C773 C756 R782 R781 L753 L798 L795 L752 L797 L721 IC701 D781 24 25 32 17 16 9 8 1 KX TGA641 CIRCUIT BOARD Handset_RF Part Component View ...

Page 102: ...uit Board Charger Unit 15 6 1 Component View 15 6 2 Bottom View J1 R1 D1 A PQUP11532Z PbF PQLV30055 PQLV30056 CIRCUIT BOARD Charger Unit Component View TP4 TP3 1 2 J1 D1 A F1 PbF PQLV30055 PQLV30056 PQUP11532Z TP4 GND TP3 CIRCUIT BOARD Charger Unit Bottom View ...

Page 103: ...TG6440PK KX TGA641S KX TGA641T KX TGA740B 16 Exploded View and Replacement Parts List 16 1 Cabinet and Electrical Parts Base Unit Note 1 Refer to the spacer No 109 of Cabinet and Electrical Parts Handset P 104 ...

Page 104: ...and Electrical Parts Handset Note 1 This cable is fixed by welding Refer to How to Replace the Handset LCD P 69 2 The rechargeable Ni MH battery HHR 4DPA is available through sales route of Panasonic 3 Attach the SPACER No 123 to the exact location described above ...

Page 105: ...105 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 16 3 Cabinet and Electrical Parts Charger Unit 16 4 Accessories ...

Page 106: ...YBOARD SWITCH DIAL 7 PNKE1030Z1 CASE CHARGE TERMINAL PS HB 8 PNJT1030Z CHARGE TERMINAL 9 PNBC1005Y1 BUTTON ERASE ABS HB 10 PNBC1006Y1 BUTTON STOP ABS HB 11 PNBC1004Y1 BUTTON ANSWER ON ABS HB 12 PNBC1007Y1 BUTTON LOCATOR ABS HB 13 PNBC1002Z2 BUTTON NAVIGATOR KEY ABS HB 14 PNHR1001Z GUIDE BUTTON HOLDER PS HB 15 PNBC1001Z2 BUTTON MESSAGE AS HB 16 PNJK1046Z KEYBOARD SWITCH TAM 17 PQMG10025W RUBBER PAR...

Page 107: ... 10 C168 PQCUV1A225KB 2 2 Safety Ref No Part No Part Name Description Remarks C172 ECUE1H102KBQ 0 001 C173 ECUV1A224KBV 0 22 C176 PQCUV0J106KB 10 C178 ECUE1C223KBQ 0 022 C181 ECUE1A104KBQ 0 1 C184 ECUV1A105KBV 1 C185 ECUE1H100DCQ 10p C186 ECUE1H100DCQ 10p C306 F2A1C1010119 100 C321 ECUV1A105KBV 1 C322 PQCUV0J106KB 10 C331 ECUV1A474KBV 0 47 C341 ECEA0JSJ331 330 S C342 ECUV0J105KBV 1 C343 ECUV1A105K...

Page 108: ...PNBC1265Z1 BUTTON VOLUME KEY ABS HB 111 PNJK1048Y KEYBOARD SWITCH for KX TGA641S 111 PNJK1048Z KEYBOARD SWITCH for KX TGA641T 112 PNHX1165Z COVER LCD SHEET 113 PNJT1027Z CHARGE TERMINAL L 114 PNJT1026Z CHARGE TERMINAL R 115 PQHR11315Z GUIDE SPEAKER HOLDER ABS HB 116 L0AA02A00095 SPEAKER 117 PQHS10784Y SPACER SPEAKER NET 118 PQJC10056X BATTERY TERMINAL 119 PNKE1027Z2 COVER EP CAP for KX TGA641S 119...

Page 109: ...416 ECUE1H102KBQ 0 001 C417 PQCUV0J106KB 10 C421 ECUE0J105KBQ 1 Safety Ref No Part No Part Name Description Remarks C422 ECUE0J105KBQ 1 C433 ECUE1E682KBQ 0 0068 C435 PQCUV0J106KB 10 C501 ECUE1H100DCQ 10p C502 ECUE1H120JCQ 12p C503 ECUE0J105KBQ 1 C504 ECUE1A104KBQ 0 1 C506 ECUV1C104KBV 0 1 C508 PQCUV0J106KB 10 C510 ECUE0J105KBQ 1 C512 ECUE1C103KBQ 0 01 C514 PQCUV0J106KB 10 C515 ECUE1A104KBQ 0 1 C52...

Page 110: ...ODY for KX TGA641S PS HB 200 1 PNKM1077Z1 CABINET BODY for KX TGA641T PS HB 200 2 PNJT1010Z CHARGE TERMINAL 200 3 PNKF1012Z6 CABINET COVER for KX TGA641S PS HB 200 3 PNKF1012Z1 CABINET COVER for KX TGA641T PS HB 200 4 PQHA10023Z RUBBER PARTS FOOT CUSH ION 200 5 PNGT1854X NAME PLATE for KX TGA641S 200 5 PNGT1854Z NAME PLATE for KX TGA641T Safety Ref No Part No Part Name Description Remarks PCB200 P...

Page 111: ...740B Expandable Digital Cordless Answering System B Black Version S Pearl Silver Version T BlackMetallicVersion for U S A TABLE OF CONTENTS PAGE 1 REPLACEMENT PARTS LIST 2 1 1 REFERENCE CHART 2 1 2 ORIGINAL AND NEW PARTS COMPARISON LISTS 2 Please file and use this supplement manual together with the service manual for Model No KX TG6440PK KX TGA641S KX TGA641T KX TGA740B Order No KM40902809CE ...

Page 112: ...cification 4 Standardization 5 Addition 6 Deletion 7 Correction 8 Other Ref No Part No Part Name Description Pcs Set Remarks Notes Time of Change Original Old New Suffix Base Unit 24 PNHX1213Z SHEET 2 a 5 V D301 B0JCME000035 D0GLR00Z0001 DIODE SI 1 c 4 Y Handset 113 PNJT1027Z PNJT1027Y CHARGE TERMINAL L 1 c 4 W 114 PNJT1026Z PNJT1026Y CHARGE TERMINAL R 1 c 4 W 118 PQJC10056X PNJC1014Z BATTERY TERM...

Page 113: ...X TG6440PK KX TGA641S KX TGA641T KX TGA740B 1 3 Cabinet and Electrical Parts Base Unit Changed from original section 16 1 Cabinet and Electrical Parts Base Unit H M KXTG6440PK KXTGA641S KXTGA641T KXTGA740B ...

Page 114: ...40B Expandable Digital Cordless Answering System B Black Version S Pearl Silver Version T Black Metallic Version for U S A TABLE OF CONTENTS PAGE 1 REPLACEMENT PARTS LIST 2 1 1 REFERENCE CHART 2 1 2 ORIGINAL AND NEW PARTS COMPARISON LISTS 2 Please file and use this supplement manual together with the service manual for Model No KX TG6440PK KX TGA641S KX TGA641T KX TGA740B Order No KM40902809CE ...

Page 115: ...nge of material or dimension 3 To meet approved specification 4 Standardization 5 Addition 6 Deletion 7 Correction 8 Other Ref No Part No Part Name Description Pcs Set Remarks Notes Time of Change Original Old New Suffix Cabinet and Electrical Parts Handset 101 PNGP1048Z2 PNGP1048Y2 PANEL LCD for KXTGA641S 1 c 4 V 101 PNGP1048Z1 PNGP1048Y1 PANEL LCD for KXTGA641T 1 c 4 V Main P C Board Parts Hands...

Page 116: ...pandable Digital Cordless Answering System B Black Version S Pearl Silver Version T Black Metallic Version for U S A TABLE OF CONTENTS PAGE 1 REPLACEMENT PARTS LIST 2 1 1 REFERENCE CHART 2 1 2 ORIGINAL AND NEW PARTS COMPARISON LISTS 2 Supplement 3 Please file and use this supplement manual together with the service manual for Model No KX TG6440PK KX TGA641S KX TGA641T KX TGA740B Order No KM4090280...

Page 117: ... See the Notes column for each part in ORIGINAL AND NEW PARTS COMPARISON LISTS 1 Improve performance Remarks j To meet the standards 2 Change of material or dimension 3 To meet approved specification 4 Standardization 5 Addition 6 Deletion 7 Correction 8 Other Ref No Part No Part Name Description Pcs Set Remarks Notes Time of Change Original Old New Suffix Cabinet and Electrical Parts Handset 104 ...

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