Panasonic KX-TG3721BXB Service Manual Download Page 21

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KX-TG3721BX/KX-TG3722BX/KX-TGA371BX

4.8.3.

Charge Circuit

Circuit Operation:

When charging the handset on the Base Unit, the charge current is as follows;

DCP+(5.5 V)

→

F301

→

R371

→

R372

→

D362

→

(Base)

→

(Handset)

→

... Battery...
BATTERY-

→

R45

→

GND

→

CHARGE-(Handset)

→

CHARGE-(Base)

→

GND

→

DCM

In this way, the BBIC on Handset detects the fact that the battery is charged.
The charge current is controlled by switching Q9 of Handset.

4.8.4.

Battery Low/Power Down Detector

Circuit Operation:

“Battery Low” and “Power Down” are detected by BBIC which check the voltage from battery.
The detected voltage is as follows;

• Battery Low

Battery voltage: V(Batt) 2.25 V ± 50 mV
The BBIC detects this level and "

" starts flashing.

• Power Down

Battery voltage: V(Batt) 2.0 V ± 50 mV
The BBIC detects this level and power down.

Q5
R4

CHG +

R31

10K

GND

CHARGE (33)

CHARGE CTRL (32)

1.2K

CHG -

GND

BATT +

BATTERY

2CELL

BATT +

GND

BBIC

IC1

C19

Summary of Contents for KX-TG3721BXB

Page 1: ...Hz Digital Cordless Answering System B Black Version N Platinum Silver Version for Asia Middle Near East and Other areas Portable KX TGA371BXB BXN KX TG3721BXB BXN Base Unit Caller ID Compatible Charger Unit Model No Base Unit Handset Charger Unit KX TG3721 1 TG3721 1 TGA371 KX TG3722 1 TG3721 2 TGA371 1 KX TGA371 1 TGA371 1 KX TGA371 is also an optional accessory which contains a handset and a ch...

Page 2: ...Diagrams Circuit Board Diagrams Exploded Views and Replacement Parts List It is essential that these critical parts should be replaced with manufacturer s specified parts to prevent shock fire or other hazards Do not modify the original design without permission of manufacturer IMPORTANT INFORMATION ABOUT LEAD FREE PbF SOLDERING If lead free solder was used in the manufacture of this product the p...

Page 3: ... 12 Measurements and Adjustments 51 12 1 Equipment Required 51 12 2 The Setting Method of JIG 51 12 3 Adjustment of Base Unit 55 12 4 Adjustment of Handset 56 12 5 Adjustment Standard Base Unit 59 12 6 Adjustment Standard Charger Unit 60 12 7 Adjustment Standard Handset 61 12 8 Things to Do after Replacing IC or X tal 62 12 9 How to Check the Handset Receiver 64 12 10 Frequency Table MHz 65 13 Mis...

Page 4: ...of used batteries according to the manufacture s 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 contains 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 mode...

Page 5: ... Please check the manufacturer s specific instructions for the melting points of their products and any precautions for using their product with other materials 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 telephone directory and caller...

Page 6: ...prox 3 0 W 0 C 40 C 20 80 relative air humidity dry Approx 77 mm x 150 mm x 90 mm Approx 200 g Rechargeable Ni MH battery 2 x 1 2 V 550 mAh 91 channels within 2 4 GHz 2 48 GHz Super Heterodyne PLL synthesizer Quadrature Discriminator 10 368 MHz 41 Hz Frequency Modulation Frequency Hopping Spread spectrum 22 bit 1 000 000 Tone DTMF Pulse Up to 24 digits Up to 24 digits Phonebook 6 days at Standby 1...

Page 7: ...ncy data is shown below It consists of 6 slots from the base unit to the handset and 6 slots from the handset to the base unit total 12 slots in 10 ms By this slot system simultaneous air link and communication between 6 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 handset and another slot from handset to t...

Page 8: ...link is established between base unit and handset The state where duplex communication is performed The hopping pattern of a 75 hops 750 mseconds cycle Dummy Bearer The base unit sends Dummy data to the all stand by state handsets The handsets receive that data for keeping synchronization and monitoring request from the base unit Dummy Bearer doesn t contain B field sound data 833 µs 5 ms 5 ms Up ...

Page 9: ...RAM Base Unit_Main SIDE_TONE CIRCUIT Crystal 10 368MHz TR_RLY TIP RING TEL_JACK VRF VPA RF_Block IC501 BBIC DC5 5V GND DC_JACK CHARGE 3 4 2 1 D101 CHARGE DETECT Q701 Q141 Q161 REGULATOR IC302 KEY PAD LED VBAT IC611 LCD Voltage Detect IC351 Q351 IC502 IC601 Q301 1 8V AVD VDD RF_VDD Q302 2 4V VDD_PA ...

Page 10: ... 4 3 Tel Interface Circuit TX AMP SIDE TONE RX AMP CONTROL CIRCUIT CALLER ID DETECT BELL DETECT L102 SA103 P101 R141 R142 3 4 2 1 C101 D101 Q141 C102 R101 C103 R102 L101 SA101 TIP RING REGULATOR C104 C105 C106 R103 R105 C107 R104 C108 R106 ...

Page 11: ...11 KX TG3721BX KX TG3722BX KX TGA371BX 4 4 Block Diagram Base Unit_RF Part KX TG3721 3722 BLOCK DIAGRAM Base Unit_RF Part IC501 ANT2 ANT1 D801 D803 ...

Page 12: ...d Voice utilizing the built in speech detector and a Flash Memory which stored the vocabulary Caller ID demodulation The BBIC implements monitor and demodulate the FSK DTMF signals that provide CID information from the Central Office Digital Switching The voice signal from telephone line is transmitted to the handset or the voice signal from the handset is transmitted to the Telephone line etc The...

Page 13: ... VBAT 3 0V in IC302 And 3 0V for peripherals and analog part is insulated from VBAT by Doubler of BBIC Circuit Operation 5 5V 5 5V 3 0V 3 0V 1 8V 3 0V_CP IC501 IC302 IC502 BBIC AC Adaptor 3 0V REGULATOR QSPI FLASH VDD3 VDD1 VDD4 3 0V_CP2 IC601 TAM FLASH IC611 EEPROM VDD5 RF Part LEDs Q301 2 4V VDD2 Q302 3 0V 1 8V Reset RSTN IC501_77pin ...

Page 14: ...14 KX TG3721BX KX TG3722BX KX TGA371BX 4 5 5 1 Charge Circuit The voltage from the AC adaptor is supplied to the charge circuits D361 R372 D362 R371 CHARGE R373 C351 F301 DCP CHARGE C306 5 5V DCM K A ...

Page 15: ...s 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 19 of BBIC turns Q141 ON OFF to make the pulse dialing Side Tone Circuit Basically this circuit prevents the TX signal from feeding back to RX signal As for this unit TX signal feed back from Q161 is canceled by the canceller circuit of BBIC C17...

Page 16: ...e is monitored at pin 32 of IC501 There is no parallel connection if the voltage is 0 54 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 the voltage is monitored at pin 17 of IC501 the presence absence of a parallel connection is determined by detecting the voltage changes If the Auto disconnect function i...

Page 17: ...s 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 number of calling party lastly end code The DTMF is chose...

Page 18: ...CPU Analog Front End D A A D 34 36 23 24 19 20 33 32 58 59 85 26 43 44 64 55 56 67 ADPCM Codec Filter DSP Speech Decoding Speech Encoding BMC Burst Decoding ANT1 Burst Encoding RF PLL MOD DEMOD 2 3 79 78 RXn ANT1 DA802 RXp TXp TXn TXon 9 10 XTAL X1 10 368 MHz BATTERY 45 ON SWITCH KEYPAD Charge Pump ROWS COLUMNS CP3 0V D3 CP2 8V CPV2 49 50 51 52 13 14 15 16 27 47 90 92 94 96 QSPI IO 0 3 BBIC IC1 IC...

Page 19: ...19 KX TG3721BX KX TG3722BX KX TGA371BX 4 7 Block Diagram Handset_RF Part KX TGA371 BLOCK DIAGRAM Handset_RF Part TXp TXn RXp RXn ANT TXON D802 ...

Page 20: ...it Charge EEPROM LCD EEPROM IC3 Setting data is stored e g ID user setting 4 8 2 Power Supply Circuit Reset Circuit Circuit Operation When power on the Handset the voltage is as follows BATTERY 2 2 V 2 6 V BATT F1 BBIC IC1 41 pin The Reset signal generates IC1 62 pin and 1 8 V 1 8 V VBAT Reset RSTN IC1_62 pin GND BATTERY 2CELL BBIC 3 0V 3 0V DOUBLER OUT Charge Pump For all peripherals 2 8V EEPROM ...

Page 21: ...harged The charge current is controlled by switching Q9 of Handset 4 8 4 Battery Low Power Down Detector Circuit Operation Battery Low and Power Down are detected by BBIC which check the voltage from battery The detected voltage is as follows Battery Low Battery voltage V Batt 2 25 V 50 mV The BBIC detects this level and starts flashing Power Down Battery voltage V Batt 2 0 V 50 mV The BBIC detect...

Page 22: ...ailure supplying power to VBAT of base unit from battery of handset through IC6 CHG terminal and Q351 4 10 Circuit Operation Charger Unit Charge control is executed at handset side so that the operation when using charger is also controlled by handset Refer to Circuit Operation Handset The route for this is as follows DC pin of J1 F1 R1 CHARGE pad Handset CHARGE pad DC pin of J1 BATT Q10 Q12 Q11 R...

Page 23: ...178 IC501 25 94 95 BASE_UNIT_RF_TX_ROUTE ANT ANT HANDSET_RF_RX_ROUTE IC1 23 24 L9 HANDSET SPEAKER HANDSET TX HANDSET RX HANDSET SP Phone TX HANDSET SP Phone RX SIGNAL ROUTE IN 㸢㩷 ROUTE 㸢㩷 OUT HANDSET MIC C11 13 RA4 IC1 19 20 HANDSET_RF_TX_ROUTE ANT ANT BASE_UNIT_RF_RX_ROUTE IC501 2 3 27 C184 Q161 Q141 D101 L101 L102 P101 T R TEL LINE T R TEL LINE L101 P101 L102 D101 Q141 R165 C173 R178 IC501 25 94...

Page 24: ...69 70 IC601 IC601 IC501 69 70 41 43 SPEAKER IC501 27 C184 Q161 Q141 D101 L101 L102 P101 T R TEL LINE T R TEL LINE L101 P101 L102 C105 C106 R105 R106 R108 R107 IC501 23 21 T R TEL LINE L101 C105 R105 R110 R111 R112 IC501 18 ANT BASE_UNIT_RF_RX_ROUTE IC501 2 3 69 70 IC601 SIGNAL ROUTE IN 㸢㩷 ROUTE 㸢㩷 OUT HANDSET RF TX_ROUTE HANDSET RF RX_ROUTE BASE UNIT RF TX_ROUTE BASE UNIT RF RX_ROUTE IC1 78 79 L80...

Page 25: ...er 7 Operating Instructions Refer to the Operating Instructions Note You can download and refer to the Operating Instructions Instruction book on TSN Server Items Contents Battery You could use other rechargeable batteries sold in a market but the unit is not guaranteed to work properly The battery strength may not be indicated correctly if the battery is disconnected and connected again even afte...

Page 26: ... H S LCD V 3 Enter 7 2 6 2 7 6 6 4 Note 7262 7664 PANA SONI see letters printed on dial keys See next page 5 Enter ٨ ٨ ٨ ٨ Address 1 6 Enter 㧖㧖 New Data 1 4 Select Write EEP using or then press or V Default Data INT Caller List V V Initial Setup BACK V Line Setup BACK BACK V Dial mode Select Line Setup using or then press or V Service Mode Read EEP Write EEP Set Addr M M M M M M M M M CLEAR INT D...

Page 27: ... dB up When hex changes from 00 to 01 or 02 gain increases by 6 dB or 12 dB C ID DTMF sensitivity 0790 50 60 6dB up 70 12 dB up When hex changes from 50 to 60 or 70 gain increases by 6 dB or 12 dB Desired Number hex Input Keys Desired Number hex Input Keys 0 0 A FLASH 0 1 1 B FLASH 1 C FLASH 2 D FLASH 3 E FLASH 4 9 9 F FLASH 5 7 Press a long confirmation beep will be heard 8 Press to return to sta...

Page 28: ... printed on dial keys 5 Enter ٨ ٨ ٨ ٨ Address 1 7 Press a long confirmation beep will be heard 8 Press to return to standby mode After that remove and reinsert the batteries 6 Enter 㧖㧖 New Data 1 4 Select Write EEP using or then press or V OFF Default Data New Data M Caller List V V Initial Setup V Service Mode Read EEP Write EEP Set Addr _ _ _ _ _ _ Set Addr Set Addr Ringer Setup M M M M M M M I...

Page 29: ...nfirm the contents Careless rewriting may cause serious damage to the handset Items Address Default Data New Data Possible Adjusted Value MAX hex Possible Adjusted Value MIN hex Remarks Battery Low 00 09 70 2 Frequency 00 07 00 08 70 02 ID 00 02 00 06 Given value Desired Number hex Input Keys Desired Number hex Input Keys 0 0 A FLASH 0 1 1 B FLASH 1 C FLASH 2 D FLASH 3 E FLASH 4 9 9 F FLASH 5 ...

Page 30: ... Unit P 42 To cancel the handset refer to Deregistering All Handsets by the Base Unit P 42 To copy the handset phonebook refer to Copying All Entries P 42 BS HS Phonebook data Phonebook data is stored in a handset 1 Register HS A to BS B HS A is normal therefore no need to copy the phonebook data 1 Register HS A to BS B as a handset no 2 2 Copy the phonebook data from HS A to HS B 3 Cancel the HS ...

Page 31: ...ok refer to Copying All Entries P 42 1 Cancel HS A 2 Register HS B as a handset no 1 3 Register HS A as a handset no 2 4 Copy the phonebook data from HS A to HS B 5 Cancel HS 2 HS A BS A NG HS A BS A HS B HS A Case 3 A handset has a defect Radio transmission is functioning NG 1 Register HS A as a handset no 2 2 Copy the phonebook data from HS A to HS B 3 Cancel HS 2 HS A NG HS A BS B HS B HS A Cas...

Page 32: ...egistration to the base unit is cancelled If the handset needs to be registered to the base unit refer to Registering a Handset to the Base Unit P 42 If users do not bring the base unit with them the registration procedure has to be done by users themselves 1 1 Connect the AC adaptor to the base unit and install the charged batteries into the handset 2 Confirm the handset is registered to the base...

Page 33: ... Handset Reception P 43 Check Caller ID P 43 Power ON Base Unit OK FLOW CHART Check Power OK Playback Pre Message Check Playback Record OK Check Record Range Check the RF part Handset Voice Transmission Check Handset Transmission Handset Voice Reception OK OK OK Check Handset Reception Caller ID function Check Caller ID Caller ID Error No voice No voice No charge Not playback Not record Not workin...

Page 34: ...into AC outlet 1 Is output voltage of AC adaptor 5 5 V YES Check AC Adaptor Check VDD1 1 8V Test point VDD1 OK Check Power Supply Circuit NO NO NO NO RSTN Reset High YES Check Reset Circuit Check Xtal CLK 10 368MHz YES Check X501 Check BBIC Check Power Supply Circuit Reset Circuit Check X1 Is the voltage of TP CP3 0 V about 3 0 V Is the voltage of TP BAT 2 3 V more Check the battery and around BAT...

Page 35: ...tect Circuit Auto Disconnect Circuit P 16 Note Flash Memory is IC601 BBIC is IC501 Check Bell signal OK Check Telephone Line Interface Bell Does the unit catch line YES Check Telephone Line Interface OFF HOOK Check Line In Pin 25 of BBIC Check ICM Recording in Signal Route NO OK Check Auto Disconnect Circuit OK Check Parallel Connection Detection Circuit OK Check BBIC and Flash Memory NO NO ...

Page 36: ...eck Power P 34 Charge Circuit P 21 Check VDD1 1 8V Test point VDD1 OK Check Power Supply Circuit Check output of BBIC Pin 41 43 OK Check BBIC and Flash Memory Check Speaker and its surroundings NO NO Check Charge Circuit of Base Unit Check Handset Plug in the AC Power source Charge Handset on Base Unit Is the voltage of two charge contacts about 3 V or more OK NO Check Charge Contacts at Base Unit...

Page 37: ...ference Charge Circuit P 21 Check Charge Circuit of Charger Unit Check Handset Plug in the AC Power source Charge Handset on Charger Unit Is the voltage of two charge contacts about 3 V or more OK NO Check Charge Contacts at Charger Unit from mechanical point of view YES ...

Page 38: ...y execute the command SFR then check the TP_CKM IC501 57pin To adjust frequency Refer to Adjustment of Base Unit P 55 Check around Power Supply Circuit Does Base Unit make link with normal working Handset Check around X501 and RF module and adjust clock frequency NO NO NO NO YES YES Is the voltage of VDD3 about 3 0V Check the RF part Does the RF clock CLK oscillate at 10 368 MHz in Base Unit Test ...

Page 39: ...1 57pin To adjust frequency Refer to Adjustment of Handset P 56 Check around Power Supply Circuit Reset Circuit Adjust 3 0V Vottage to 3 0V Does Handset make link with Base Unit Correct working unit Check around X1 and RF module and adjust clock frequency NO NO NO NO Is the voltage of TP BAT about 2 2 2 8 V Is the voltage of TP 1 8V about 1 8 V YES YES YES YES Is the voltage of TP CP3 0 about 3 0 ...

Page 40: ... 2 a Re register regular HS Normal mode to base unit to be checked If this operation fails in some ways the base unit is defective b Re register handset to be checked to regular BU Normal mode If this operation fails in some ways the handset is defective Base unit is defective Handset is defective START Registration of Regular HS to base unit Registration of handset to Regular BU other checkings R...

Page 41: ...er to Check Link P 38 Start Link confirmation Normal 1 Control signal confirmation X tal Frequency confirmation TX confirmation Range confirmation Normal TEST RANGE Check Check BBIC interface parts RF Block BBIC on BU HS P C B Adjust X tal Frequency 1 Check TX Block GOOD 5 2 3 4 OK OK OK NG NG NG NG NG OK OK ...

Page 42: ...gain to stop then repeat this step The next step must be completed within 90 seconds 3 Handset Press OK then wait until a long beep sounds Note While registering Base in registering is displayed on all registered handsets MENU i 1 3 0 L 1 All handsets registered to the base unit are displayed 2 Select the handset you want to cancel i OK 3 Yes i OK 4 OFF MENU i 1 3 1 1 C i MENU 2 Copy All i OK 3 Se...

Page 43: ...tion Caller ID Call Waiting Caller ID P 17 Note Make sure the format of the Caller ID service of the Telephone company that the customer subscribes to It is also recommended to confirm that the customer is really a subscriber of the service Check MIC of handset Check handset Tx in Signal Route Check speaker of handset Check handset Rx in Signal Route YES Did bell ring Message indicator blinks Chec...

Page 44: ... Assembly Instructions 11 1 Disassembly Instructions 11 1 1 Base Unit Ԙ Remove the 4 screws to remove the cabinet cover ԙ Remove the tape and solders Ԛ Remove the screw to remove the jack holder Cabinet cover Ԙ 4 screws Tape and solders ԙ Ԛ screw Jack holder ...

Page 45: ...X TG3722BX KX TGA371BX Ԝ Remove the 2 screws to remove the operational P C board Operational P C board Ԝ 2 screws ԛ Remove the parallel wire and screw to remove the main P C board ԛ Parallel wire Main P C board ԛ screw ...

Page 46: ...binet cover by pushing it upward Ԝ Remove the solders and tape ԝ ԝ Remove the screw to remove the main P C board Main P C board Ԝ Screw Cabinet cover Cabinet body Cabinet cover 2 screws Ԙ Solders and Tape Insert a plastic card Ex Used SIM card etc between the cabinet body and the cabinet cover then pull it along the gap to open the cabinet ...

Page 47: ... TG3721BX KX TG3722BX KX TGA371BX 11 1 3 Charger Unit Ԙ Remove the screw to remove the cabinet cover ԙ Remove the solders to remove the 2 charge terminals Ԙ Screw ԙ Solders Main P C board 2 charge terminals ...

Page 48: ...Z430PIR Heatweld with the tip of the soldering iron about 5 to 8 seconds in case of 60W soldering iron New LCD Operational P C B 0 2mm 0 2mm If interval tolerance between center lines is less than 0 2 mm it is o k Horizontal Interval Tolerance Vertical Interval Tolerance OK NG NG NG Horizontal interval tolerance is more than 0 2 mm Vertical interval tolerance is more than 0 2 mm Inclined ...

Page 49: ...49 KX TG3721BX KX TG3722BX KX TGA371BX Ԛ A Attach the LCD and fix by hook A two points ...

Page 50: ...ot damaged Fit the heatseal of a new LCD Rubber of Soldering Iron Part No PQZZ430PRB Tip of Soldering Iron Part No PQZZ430PIR Heatweld with the tip of the soldering iron about 5 to 8 seconds in case of 60W soldering iron New LCD 0 2 mm 0 2 mm P C board If interval tolerance between center lines is less than 0 2 mm it is o k Horizontal Interval Tolerance Vertical Interval Tolerance OK NG NG NG Hori...

Page 51: ...on 12 2 The Setting Method of JIG Preparation Serial JIG cable PQZZ1CD300E PC which runs in DOS mode Batch file CD ROM for setting PNZZTG3721BX Note If you have the JIG Cable for TCD500 series PQZZ1CD505E change the following values of resistance Then you can use it as a JIG Cable for both TCD300 and TCD500 series It is an upper compatible JIG Cable 12 2 1 Connections Base Unit Connect the AC adap...

Page 52: ... and BATT Connect the JIG cable GND black to GND Connect the JIG cable UTX yellow to UTX and URX red to URX Note COM port names may vary depending on what your PC calls it DC Power or Battery 2 GND black 3 To Serial Port com port 1 JIG Cable PC URX red 3 UTX yellow Handset P C board 1 BATT BATT GND UTX URX ...

Page 53: ...sages appear change the port number or 䇭check the cable connection 䊶If any value appear go to next step 7 Type DOSKEY then press the Enter key Example C Documents and Settings D D CD PNZZTG D PNZZTG SET_COM X D PNZZTG READID 00 52 4F A8 A8 D PNZZTG DOSKEY D PNZZTG Example error happens C Documents and Settings D D CD PNZZTG D PNZZTG SET_COM X D PNZZTG READID ޓ CreateFile error ERROR 10 Can t open ...

Page 54: ...ROM Type rdeeprom 00 00 FF and the data from address 00 00 to FF is read out readid Read ID RFPI Type readid and the registered ID is read out writeid Write ID RFPI Type writeid 00 18 E0 0E 98 and the ID 0018 E0 0E 98 is written getchk Read checksum Type getchk wreeprom Write the data of EEPROM Type wreeprom 01 23 45 01 23 is address and 45 is data to be written ...

Page 55: ... you can register a new parameter value D PNZZTG 5 Please operate step1 to 5 again until the voltage becomes it within the range Frequency Adjustment 1 Type sendchar SFR then set to RF burst mode Respons OK 2 Check Frequency STM CKM P15 GND Example 3 If Frequency value is 10 368000 MHz 41 Hz then OK finished Adjustment process D PNZZTG sendchar SFR Please turn off the power of PCB board If Frequen...

Page 56: ...quency value is not 10 368000 MHz 41 Hz then go to step 4 4 You can check registered value of parameter When you want to up the frequency Value 1 D PNZZTG sendchar SFR 02 7A When you want to down the frequency Value 1 OK 5 Type sendchar SFR nn nn you can register a new parameter value D PNZZTG 6 Please operate step1 to 6 again until the Frequency becomes it within the range Please confirm the foll...

Page 57: ...If successful OK is displayed as below Press any key and verify backup power supply In case FAIL is displayed read description in the next line Refer to the picture below Shut down and restart the handset then try the adjustment again if EEPROM writing error Try again is shown Check model number if Wrong model Check model No is shown Reject the handset if Return value of DAV command is wrong is sh...

Page 58: ... 06 hex Press any key to continue Then connect a 20 ohm resistor between the two charge terminals Run the batch file DAVread_only_TGA371_381 bat again The average should be within the range of 18 to 34 hex Press any key and shut the handset down Remove the 20 ohm resistor L The average of four readouts should be within the range of 00 to 06 hex With a 20 ohm resistor between the two charge termina...

Page 59: ...13 R516 R517 R111 R109 R166 R164 R169 R142 R143 R360 R162 R161 R145 R181 R144 R112 R364 R365 R361 R606 R362 R363 R321 L665 L664 L662 L663 IC611 IC502 IC601 D301 Q354 Q352 Q142 Q161 Q301 Q302 Q601 C108 C107 C105 C103 C104 C106 C662 C663 C510 C509 C518 C501 C181 C184 C523 C515 C514 C312 C611 C477 C476 C479 C478 C475 C474 C322 R102 R101 R103 R105 R358 R353 R359 R107 R141 R502 R507 R503 R504 R672 R366...

Page 60: ... TGA371BX 12 6 Adjustment Standard Charger Unit When connecting the simulator equipment for checking please refer to below 12 6 1 Bottom View A PNLB1922Z 3 0A F1 PbF IG Charge Charge 12 2 W Digital Volt Meter DC POWER DC 5 5 V GND ...

Page 61: ... R5 R30 F1 2 5A R10 R19 R76 R203 R215 R807 JOINT3 L48 L803 L826 L864 L863 IC3 IC1 RA61 RA30 RA31 RA40 RA4 D22 Q9 Q10 Q5 Q7 C35 C4 C74 C75 C34 C39 C344 C345 C341 C342 C77 C704 C172 C188 C152 C138 C851 C825 C869 C813 C826 C811 C809 C865 C44 C46 C96 C97 C10 C49 C50 C53 C12 C54 C78 C823 C18 C17 C139 C175 C174 C173 X1 R45 R13 R4 R6 R3 R14 R31 Q6 R20 R1 RF SHIELD R77 R100 R18 R101 R809 R27 R23 R28 R66 R...

Page 62: ... Connect the JIG cable again and execute the command getchk then confirm the checksum value is correct If the downloading fails start again from step 1 9 Default batch file Execute the command default bat 10 Country version batch file Execute the command TG3721_BX_RevXXX_YYY bat 1 11 Bandgap voltage frequency adjustment Refer to Adjustment of Base Unit P 55 EEPROM IC611 Adjusted parameter data is ...

Page 63: ... the checksum value is correct If the downloading fails start again from step 1 9 Default batch file Execute the command default bat 10 Default batch file remaining Execute the command TGA371_DEF_RevXXX_YYY bat 2 11 Country version batch file Execute the command TGA371_BX_RevXXX_YYY bat 2 12 Bandgap voltage frequency adjustment battery monitor check battery low confirmation Adjustment of backup po...

Page 64: ...meter and set the selector knob to ohm meter 2 Put the probes at the speaker terminals as shown below Handset speaker receiver Digital Voltmeter Is the value between terminal and terminal about 8 SPEAKER NG NO OK YES Replace the speaker receiver Is the value between terminal and terminal about 34 RECEIVER ...

Page 65: ...H 2437 344 2438 208 43 2BH 2438 208 2439 072 44 2CH 2439 072 2439 936 45 2DH 2439 936 2440 8 46 2EH 2440 8 2441 664 47 2FH 2441 664 2442 528 48 30H 2442 528 2443 392 49 31H 2443 392 2444 256 50 32H 2444 256 2445 12 51 33H 2445 12 2445 984 52 34H 2445 984 2446 848 53 35H 2446 848 2447 712 54 36H 2447 712 2448 576 55 37H 2448 576 2449 44 56 38H 2449 44 2450 304 57 39H 2450 304 2451 168 58 3AH 2451 1...

Page 66: ...ficiently 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 1 3 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 pe...

Page 67: ...en placing 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 Solder Soldering Iron P C Board Land IC Solder S...

Page 68: ...mage the PCB foil Flux Recommended Flux Specific Gravity 0 82 Type RMA lower residue non cleaning type Note See About Lead Free Solder PbF Pb free P 4 13 2 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 int...

Page 69: ...cy 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 2 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 70: ...Desoldering Tool Temperature 608 F 68 F 320 C 20 C 13 3 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 3 3 How to Remove the Shield Case Note If you don t have special tools ex Hot air disordering tool conduct the fol...

Page 71: ... TGA371BX 13 3 4 How to Install the Shield Case Note If you don t have special tools ex Hot air disordering tool conduct the following operations Shield case s No PNMC1032Z PNMC1033Z 1 Put the shield case 2 Solder the surroundings ...

Page 72: ... Anode B0ECKM000008 B0DCCD000013 PQVDMD5S B1ACGP000008 3 2 1 4 C0DBEYY00102 PSVTUMG11NTR 1 3 2 5 4 1SS355 PQVDPTZT2530 LNJ237W82RA Cathode Anode C1CB00003545 49 25 48 73 96 72 24 1 1 Reverse View 1 4 8 5 PNWIGA381BXR C3FBLY000125 Anode Cathode MA8043 B0DCCD000013 C B E B1ADGE000012 B1ADCF000040 B1ABDF000017 B1ADNB000003 2SC6054JSL B1ABGE000011 Anode Cathode B0JCMC000006 B0JCDD000001 Reverse View A...

Page 73: ...rams 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 negative voltage line 2 The schematic diagrams may be modified at any time with the development of new technology Important Safety Notice Components identified by mark have special characteristics important for ...

Page 74: ...NC L663 NC 3 0_CP2 RA653 1k 1 2 3 4 5 6 7 8 R665 10k R502 3 3k C661 0 1u Q601 D473 NC A K D472 NC A K C474 2200p C475 2200p R605 47k R507 100k 1 8V STM CKM P15 VDD5 VDD4 1 8V R671 47k R672 47k R673 47k RA652 1k 1 2 3 4 6 7 8 RA651 1k 1 2 3 4 5 5 6 7 8 R474 1 R475 1 C476 150p C479 150p C509 2 2u R517 47k R516 47k 3 0_CP2 R668 560 IC601 8M FLASH 1 CS 2 DO IO1 6 CLK 7 HOLD IO3 3 WP IO2 8 VCC 4 GND 5 ...

Page 75: ... NC 2 1 C165 NC C142 K0 01u D153 NC A K R164 2 7k Q141 B E C R145 2 2k C132 K0 01u R147 NC L102 33u SA101 270V 2 1 R141 100k R169 0 C163 NC R160 910 D133 A K R170 0 C152 0 01u 1 A0 2 A1 6 SCL 7 WP 3 A2 8 VCC 4 VSS 5 SDA 1 VSS_LNA1 2 RF_RXn 3 RF_RXp 4 VSS_LNA2 5 RFP1 6 RFP0 7 REF_RES 8 AVS_XTAL 9 XTAL2 10 XTAL1 11 AVD_XTAL 12 RF_SUPPLY1 13 VDD1 14 P4_0 SPI2_EN 15 P4_1 SPI2_CLK 16 P4_4 17 PARADET P3...

Page 76: ... 1 2 ANT2_TP C823 NC GND GND TXON C853 10p GND ANT2 C859 10p ANT_1 D803 D804 D802 D801 ZA1 Shield 1 2 3 4 5 6 7 9 11 8 10 12 GND C826 10p L806 1 5n L805 1 5n C820 4 7p GND GND L807 15n C851 10p C805 1 8p C806 1 8p C810 0 6p C813 0 6p C827 2p C828 2p C860 3 3p C861 2p L802 4 7n L803 4 7n L804 4 7n W 0 15mm L 20 1mm 3rd layer W 0 15mm L 22 4mm 1st or 4th layer W 0 15mm L 6 0mm 1st layer W 0 15mm L 2...

Page 77: ...YS_E LCD_GND CARBON_TEST CT1 CT2 LCD_SID LCD_SCL LCD_RST LCD_CD LCD_VDD LCD_CS LED902 A K LED901 A K MSG3 1 2 MSG4 1 2 BL1 KEY_1 KEY_2 LED905 LED906 GND BL2 LED907 LED908 CN901 CBN12 0 9 2 8X14 1 2 3 4 5 6 7 8 9 10 11 12 GND GND GND C901 1u 16V C902 1u 25V C903 1u 16V R901 180 R902 180 R903 180 R904 180 1 10 1 10 GND VG RSTB CSB VSS A0 SDA SCLK VDD1 VDD2 V0 XV0 KX TG3721 3722 SCHEMATIC DIAGRAM Bas...

Page 78: ... C5 0 1u R50 10k C104 D10p C107 NC C106 NC C103 J100p R54 10k C105 J100p R55 1k C1 220u 6 3 RE2 C2 220u 6 3 RE2 D1 CHG CHG LEFT 1 2 DOWN 1 2 RIGHT 1 2 UP 1 2 R4 3 3 3216 R3 1k Q9 Q5 Q6 Q4 X1 10 368M 1 3 2 R31 10k R8 30k R9 30k C19 K1000p Q7 R53 3 3k R10 1 5k F1 2 5A CN5 7 SID RA32 150 1 2 3 4 5 6 7 8 RA31 470 1 2 3 4 RA30 470 1 2 3 4 5 6 7 8 R51 330 R52 330 R1 NC C174 K1u IC1 1 VSS_LNA1 2 RF_RXn 3...

Page 79: ...T1_TP ANT Short GND C811 10p D801 C822 10p BATTERY L863 1 5n L864 1 5n C826 10p C827 1 8p 17 CIDINp P3_2 18 VREFp 19 CIDINn MICp 20 CIDOUT MICn 21 MICh 22 VREFm 23 LSRp 24 LSRn 25 AVD 26 LDO_CTRL 27 ADC0 P3_3 28 ADC1 INT0 P1_0 29 NTC ADC2 30 SOCp 31 SOCn 32 CHARGE_CTRL 33 P1_7 CHARGE 34 DP1 PAOUTp P3_1 35 VDD_PA 36 DP0 PAOUTn P3_0 37 ULP_XTAL 38 CP_C1x 39 CP_C2x 40 CP_C1y 41 VBAT_CP 42 CP_C2y 43 C...

Page 80: ...80 KX TG3721BX KX TG3722BX KX TGA371BX 14 6 Schematic Diagram Charger Unit J1 2 1 G TP1 TP2 F1 R1 6 8 2W SCHEMATIC DIAGRAM Charger Unit ...

Page 81: ... C341 C857 C858 C851 C859 R665 R668 R372 R147 R501 R110 R125 R121 R132 R133 R168 R170 R160 R891 SA101 SA103 L806 IC501 IC351 D153 D142 D143 D801 D101 D803 Q144 Q351 C853 C854 C112 C186 C508 C511 C512 C505 C161 C164 C353 C352 C152 C168 C520 C503 C504 C513 C813 C516 C826 C820 C825 C860 C850 C346 C101 C102 C132 X501 R371 R163 R167 R152 R151 R148 R351 R352 R355 R354 R373 R123 R122 R178 R108 R165 R807 ...

Page 82: ...12 R611 R612 RSTN R613 R516 R517 R111 R109 R166 R164 R169 R142 R143 R360 R162 R161 R145 R181 R144 R112 R364 R365 R361 R606 R362 R363 R321 L665 L664 L662 L663 IC611 IC502 IC601 D301 Q354 Q352 Q142 Q161 Q301 Q302 Q601 C108 C107 C105 C103 C104 C106 C662 C663 C510 C509 C518 C501 C181 C184 C523 C515 C514 C312 C611 C477 C476 C479 C478 C475 C474 C322 R102 R101 R103 R105 R358 R353 R359 R107 R141 R502 R507...

Page 83: ...t_Operation A KX TG3721 3722 CIRCUIT BOARD Base Unit_Operation Component View PNLB1911Z PbF TG413xUS TG662xEU TG33CN TG372xBX STOP DOWN MSG3 MSG4 MSG1 MSG1 LED902 LED901 LED906 LED905 LED908 LED907 UP ANS SKIP LOCAT INT RPT ERASE C902 C901 C903 R902 R904 R901 R903 IG ...

Page 84: ...84 KX TG3721BX KX TG3722BX KX TGA371BX Memo ...

Page 85: ...48 C810 C806 C812 C838 C837 C827 C820 C43 C822 C850 C70 C71 R9 R8 R11 R5 R30 F1 2 5A R10 R19 R76 R203 R215 R807 JOINT3 L48 L803 L826 L864 L863 IC3 IC1 RA61 RA30 RA31 RA40 RA4 D22 Q9 Q10 Q5 Q7 C35 C4 C74 C75 C34 C39 C344 C345 C341 C342 C77 C704 C172 C188 C152 C138 C851 C825 C869 C813 C826 C811 C809 C865 C44 C46 C96 C97 C10 C49 C50 C53 C12 C54 C78 C823 C18 C17 C139 C175 C174 C173 X1 R45 R13 R4 R6 R3...

Page 86: ... View DOWN UP LEFT SP RIGHT TALK SOFT_A S1 SOFT_B LED12 LED4 LED9 LED7 LED8 LED1 LED2 LED3 LED6 LED5 R50 R54 C104 C105 C107 CN5 R55 R52 R51 R53 C106 C103 C580 SOFT_C R A 0 MIC CARBON_CL1 8 7 4 1 5 6 2 3 9 KX TGA371 CIRCUIT BOARD Handset_Main Bottom View ...

Page 87: ...X KX TG3722BX KX TGA371BX 15 4 Circuit Board Charger Unit 15 4 1 Component View 15 4 2 Bottom View R1 J1 CIRCUIT BOARD Charger Unit Component View A A PNLB1922Z 3 0A F1 PbF IG CIRCUIT BOARD Charger Unit Bottom View ...

Page 88: ...ase Unit Note 1 This cable is fixed by welding Refer to How to Replace the Base unit LCD P 48 Do not process a lead wire on jack holder 19 1 CUSHION LCD Push the lead wire toward the arrow after it puts a seal A 14 10 11 9 A E2 A PCB2 15 16 18 E1 1 E3 17 8 4 2 3 5 6 A A A 1 7 12 13 13 Ref No Figure A 2 6 x 8mm PCB1 E4 ...

Page 89: ...HR 4MRT is available through sales route of Panasonic 3 Attach the SPACER No 115 to the exact location described above 102 103 104 E104 E101 1 110 111 105 108 E108 B 116 115 3 101 107 E102 E105 E109 E106 B E107 MIC100 PCB100 106 112 109 Ref No Ǿ2 8 mm B Figure 114 113 2 Spacer No 115 Battery cover Put it in the center Stick it between ribs CUSHION RUBBER STICK IT WITHIN THE FRAMEWORK ON P C B E103...

Page 90: ...90 KX TG3721BX KX TG3722BX KX TGA371BX 16 3 Cabinet and Electrical Parts Charger Unit B 200 200 1 200 3 200 4 200 2 PCB200 ...

Page 91: ...91 KX TG3721BX KX TG3722BX KX TGA371BX 16 4 Accessories A1 A2 ...

Page 92: ...ble Resistor ERF Cement Resistor Type ECFD Semi Conductor ECQS Styrol ECUV PQCUV ECUE Chip ECQMS Mica ECCD ECKD ECBT F1K ECUV Ceramic ECQE ECQV ECQG Polyester ECEA ECST EEE Electlytic ECQP Polypropylene Wattage Type Voltage Of Capacitor 10 16 1 8W 14 25 1 4W 12 1 2W 1 1W 2 2W 3 3W Voltage ECQ Type ECQG ECQV Type 05 50V 1 100V 2 200V ECSZ Type 0J 6 3V 1A 10V 1C 16V 1E 25 25V 1V 35V 50 1H 50V 1J 16V...

Page 93: ...S R321 ERJ2RKF1400 140 R322 ERJ2RKF1000 100 R351 ERJ2GEJ392 3 9k S R352 ERJ2GEJ563 56k S R353 ERJ2GEJ103 10k S Safety Ref No Part No Part Name Description Remarks R354 ERJ2GEJ103 10k S R355 ERJ2GEJ681 680 S R358 ERJ2GEJ103 10k S R359 ERJ2GEJ103 10k S R360 ERJ2GEJ563 56k S R361 PQ4R10XJ680 68 S R362 PQ4R10XJ680 68 S R363 ERJ2GEJ222 2 2k S R364 ERJ2GEJ103 10k S R365 ERJ2GEJ473 47k S R366 ERJ2GEJ103 ...

Page 94: ...1H3R3A798 3 3p C861 F1G1H2R0A798 2p OTHERS E1 L5DYBYY00021 LIQUID CRYSTAL DISPLAY 2 E2 PNHX1406Z COVER LCD E3 PNHR1386Z GUIDE LCD ABS HB E4 PNMC1033Z CASE MAGNETIC SHIELD 3 P101 D4DAY220A022 THERMISTOR POSISTOR F301 K5H302Y00003 FUSE X501 H0J103500037 CRYSTALOSCILLATOR 1 Safety Ref No Part No Part Name Description Remarks Safety Ref No Part No Part Name Description Remarks PCB2 PNWP23721BXH OPERAT...

Page 95: ...20k S R7 ERJ2GEJ103 10k S R8 ERJ2GEJ303 30k S R9 ERJ2GEJ303 30k S R10 ERJ2GEJ152 1 5k S R11 ERJ3GEYJ1R0 1 S R13 ERJ2GEJ681 680 S R14 ERJ2GEJ102 1k S R18 ERJ2RKF1003 100k R19 ERJ2RKF3302 33k R20 ERJ2GEJ100 10 S R23 ERJ2GEJ102 1k S R27 ERJ2GEJ821 820 S R28 ERJ2GEJ821 820 S R30 ERJ2GEJ152 1 5k S R31 ERJ2GEJ103 10k S R45 ERJ6RSJR10V 0 1 R50 ERJ2GEJ103 10k S R51 ERJ3GEYJ331 330 S R52 ERJ2GEJ331 330 S R...

Page 96: ...UBBER PARTS RECEIVER E106 PNMC1032Z CASE MAGNETIC SHIELD 3 E107 PNVE1011Z BATTERY TERMINAL ABS HB E108 PNJT1059Z CHARGE TERMINAL L E109 PNJT1060Z CHARGE TERMINAL R F1 K5H252Y00002 FUSE X1 H0J103500039 CRYSTAL OSCILLATOR 1 Safety Ref No Part No Part Name Description Remarks 200 PNLC1018ZB CHARGER UNIT ASS Y without NAME PLATE RTL for KX TG3722BXB for KX TGA371BXB 200 PNLC1018ZN CHARGER UNIT ASS Y w...

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Panasonic KX-TG3721BXB, Service Manual, Page: 21 / 96

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