Panasonic KX-TG8421BX Service Manual Download Page 1

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Telephone Equipment

Model No.

KX-TG8421BX
KX-TGA840BX

Digital Cordless Answering System

(for Middle Near East and Africa)

Summary of Contents for KX-TG8421BX

Page 1: ...ic Communications Co Ltd 2009 Unauthorized copying and distribution is a viola tion of law Telephone Equipment Model No KX TG8421BX KX TGA840BX Digital Cordless Answering System for Middle Near East and Africa ...

Page 2: ...oding BMC Burst Encoding Burst Decoding RF PLL 5 3 77 75 9 10 EEPROM SCL SDA 57 58 44 To AC Adaptor Limit Resistor Charge Detector CHARGE CONTACT Optional VUNREG 3 0V Reg IC1 2 4V Reg Q9 1 8V Reg Q8 3 0 V 2 4 V 1 8 V BBIC IC401 IC7 MOD DEMOD Charge Pump 43 2 5V XTAL X1 X1 10 368 MHz IC801 RX n RX p TX p TX n P on PSEL V DD PADRV 4 3 6 7 TX on RX on D801 6 72 ANT1 ANT2 9 8 ANT1 ANT2 RF PA ANT1 ANT2...

Page 3: ...ation and Echo suppression DSP section Any tones tone sidetone ringing tone etc generation DSP section DTMF receiver DSP section Clock Generation for RF Module ADC DAC timer and power control circuitry PLL Oscillator Detector Compress Expander First Mixer All interfaces ex RF Power Amp EEPROM LED Analog Front End etc RF Power Amp IC801 Amplifier for transmission and reception EEPROM IC401 Temporar...

Page 4: ...shown in Fig 101 The power supply is as follows DECT BBIC IC7 DC Jack 6 5 V D1 IC1 IC7 DC Jack 6 5 V D1 IC1 Q9 IC7 DC Jack 6 5 V D1 IC1 Q8 IC7 RF Power Amp IC801 DC Jack 6 5 V D1 IC1 IC801 Power AMP EEPROM IC401 DC Jack 6 5 V D1 IC1 IC7 IC401 FLASH MEMORY IC421 DC Jack 6 5 V D1 IC1 IC7 IC421 Charge Contact TP16 DC Jack 6 5 V D1 R56 R55 D22 TP16 Fig 101 ...

Page 5: ...ck Diagram Base Unit P 2 The voice signal passes through the analog part of IC7 where it is amplified and converted to a digital audio stream signal The burst switch controller processes this stream performing encryption and scrambling adding the various other fields to produce the GAP Generic Access Profile standard DECT frame assigning to a time slot and channel etc In IC7 the carrier frequency ...

Page 6: ...og Front End D A A D 33 35 15 16 19 20 18 28 32 31 57 58 36 13 43 42 63 54 55 66 ADPCM Codec Filter DSP Speech Decoding Speech Encoding BMC Burst Decoding RF PA IC801 Burst Encoding RF PLL MOD DEMOD 5 3 4 3 6 7 8 9 2 77 78 75 RXn RXon ANT DA801 RXp TXp TXn Pon PSEL TXon VDD PADRY 9 10 XTAL X1 10 368 MHz BATTERY 44 ON SWITCH KEYPAD Charge Pump ROWS COLUMNS CP2 5V CP4 0V 48 49 50 51 22 23 24 25 26 B...

Page 7: ... 3 Charge Circuit Circuit Operation When charging the handset on the Base Unit the charge current is as follows DC 6 5 V D1 R56 R55 D22 CHARGE Base CHARGE Handset Q4 D7 F1 BATTERY Bat tery BATTERY R45 GND CHARGE Handset CHARGE Base GND DC GND 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 Refer to Fig 101 in ...

Page 8: ...8 KX TG8421BX KX TGA840BX 1 5 Circuit Operation Charger Unit 1 5 1 Power Supply Circuit The power supply is as shown ...

Page 9: ...9 KX TG8421BX KX TGA840BX 1 6 Signal Route ...

Page 10: ...10 KX TG8421BX KX TGA840BX ...

Page 11: ...opment of new technology 2 1 2 Handset Schematic Diagram Handset Notes 1 DC voltage measurements are taken with an oscilloscope or a tester with a ground 2 The schematic diagram may be modified at any time with the development of new technology 2 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 d...

Page 12: ...GND_C Q24 NC C504 NC GND NC C506 1 8V C837 NC CN5 10 CN5 9 CN5 8 CN5 7 CN5 6 CN5 5 CN5 4 CN5 3 CN5 2 CN5 1 1 5p C803 27n L801 DA802 1 2 3 DA801 1 2 3 10p C511 10p C512 10p C513 10p C514 10p C515 10p C516 C853 2p 1 8p C804 1 8p C802 Shield 1 2 3 4 5 6 3n L802 3n L803 GND C851 2p 10p C822 3 3p C805 3 3p C806 2 2p C810 2 2p C813 VDD4 C163 NC 10p C517 10p C518 10p C519 GND C520 NC GND JTAG 3p C860 GND...

Page 13: ...13 KX TG8421BX KX TGA840BX Z Z Z Z Z Z Z Z Z Z b q Z Z v v Z Z Z Z Z Z Z Z ZZ Z Z ZZ q q b ...

Page 14: ...3 Schematic Diagram Base Unit_Operation ANS1 1 2 STOP 1 2 ERASE 1 2 MSG2 1 2 MSG1 1 2 RPT 1 2 SKIP 1 2 UP 1 2 DOWN 1 2 LOCAT INT 1 2 LED902 A K LED901 A K MEG_LED KEYIN2 KEYS_B ANS_LED KEYS_E KEYS_C KEYIN1 2APVCC KEYIN3 KEYS_D PCB ...

Page 15: ...15 KX TG8421BX KX TGA840BX Memo ...

Page 16: ...X1 10 368M 1 3 2 LED1 LED5 LED6 LED2 LED3 LED4 Q4 270 R305 270 R302 270 R301 270 R300 270 R304 270 R303 GND C138 C139 D10p C29 1 VSS_LNA1 2 RF_RXp 21 CIDINp VREFp 3 RF_RXn 4 VSS_LNA2 5 RFP1 6 RFP0 7 REF_RES 8 AVS_XTAL 22 RINGp P3_7 23 RINGn P3_6 24 RINGOUT RINGING P3_5 25 PARADET P3_4 26 ADC0 P3_3 27 ADC1 INT0 P1_0 28 NTC ADC2 41 CP_C2y 42 CP_VOUT1 LED1 43 CP_VOUT2 LED2 44 PON P1_6 45 VDD1 46 P2_7...

Page 17: ...17 KX TG8421BX KX TGA840BX Z Z Z Z Z Z Z Z b Z b Z b Z b Z b Z Z b Z b Z b Z b Z b Z b Z b Z b Z b Z Z Z Z Z Z b Z b Z b q Z Z Z b b q bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb v q b 6 ...

Page 18: ...18 KX TG8421BX KX TGA840BX 2 5 Schematic Diagram Charger Unit J1 2 1 TP3 G TP2 TP1 TP4 R1 10 D1 A K F1 SCHEMATIC DIAGRAM Charger Unit ...

Page 19: ...19 KX TG8421BX KX TGA840BX 3 Printed Circuit Board 3 1 Circuit Board Base Unit_MAIN 3 1 1 Component View Z Z Z Z ...

Page 20: ...20 KX TG8421BX KX TGA840BX 3 1 2 Bottom View Z Z Z Z Z Z b Z Z ...

Page 21: ...21 KX TG8421BX KX TGA840BX 3 2 Circuit Board Base Unit_Operation 3 2 1 Component View Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z ...

Page 22: ...22 KX TG8421BX KX TGA840BX Memo ...

Page 23: ...23 KX TG8421BX KX TGA840BX 3 3 Circuit Board Handset 3 3 1 Component View Z Z Z Z Z Z Z Z Z Z Z Z Z ...

Page 24: ...24 KX TG8421BX KX TGA840BX 3 3 2 Bottom View Z Z Z Z Z Z Z Z Z Z ...

Page 25: ...harger Unit 3 4 1 Component View 3 4 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 CIRCUIT BOARD Charger unit Bottom View TP4 GND TP3 ...

Page 26: ...81A008 680P C14 ECUE1E472KBQ 0 0047 C17 PQCUV1A225KB 2 2 C18 ERJ3GEYJ682 6 8k C22 PQCUV1A105KB 1 C23 ECJ0EB0J224K 0 22 S C25 ECUE1C103KBQ 0 01 C27 F2A1H100B132 10 C29 F1G1H5R0A480 5P C30 F1G1H5R0A480 5P C31 PQCUV1A225KB 2 2 C32 F2A1C1010119 100 C36 F2A1A3310040 330 C37 F1G1H5R0A480 5P C42 ECUV1C103KBV 0 01 C43 ECUV1C103KBV 0 01 C51 ECUE1A104KBQ 0 1 C52 ECUE1H821KBQ 820p C53 ECUE1H821KBQ 820p C54 E...

Page 27: ...J104 100k R15 PQ4R10XJ272 2 7k S R16 ERJ2GEJ103 10k R17 ERJ2GEJ222 2 2k R18 ERJ2GEJ273X 27k R19 ERJ2GEJ822 8 2k R20 ERJ2GEJ392 3 9k R21 ERJ12YJ120 12 R22 ERJ12YJ270 27 R23 ERJ2GEJ104 100k R24 ERJ2GEJ473 47k R27 ERJ2GEJ104 100k Safety Ref No Part No Part Name Description Remarks R28 ERJ2GEYJ474 470k S R29 ERJ2GEJ121 120 R30 ERJ3GEYJ820 82 R31 ERJ3GEYJ821 820 R32 ERJ2GEJ823 82k R33 ERJ2GEJ102 1k R34...

Page 28: ...J471 470 R52 ERJ2GEJ221 220 R53 ERJ2GEJ332 3 3k R54 ERJ2GEJ103 10k R55 ERJ2GEJ102 1k R63 ERJ2GEJ101 100 R64 ERJ2GEJ103 10k R66 ERJ2GEJ102 1k R71 ERJ3GEYJ820 82 R73 ERJ2GEJ820 82 R74 ERJ2GEJ820 82 R203 D0GA563ZA006 56k R208 ERJ2GE0R00 0 R209 ERJ2GE0R00 0 R215 ERJ2GE0R00 0 R225 ERJ2GE0R00 0 R300 ERJ2GEJ271 270 R301 ERJ2GEJ271 270 R302 ERJ2GEJ271 270 R303 ERJ2GEJ271 270 R304 ERJ2GEJ271 270 R305 ERJ2G...

Page 29: ...61 F1G1H3R0A480 3p C862 F1G1HR50A480 0 5p C863 ECUE1H100DCQ 10p C864 ECUE1H100DCQ 10p MIC100 L0CBAY000032 MICROPHONE E101 L5DYDYY00003 LIQUID CRYSTAL DISPLAY E102 PQLZ11015Z BACKLIGHT UNIT E103 PNMC1013Z CASE MAGNETIC SHIELD ABS HB E104 PNLA1020Z ANTENNA E105 PNVE1002Z BATTERY TERMINAL E106 PNJE1022Z SPECIAL SWITCH X1 H0J103500034 CRYSTAL OSCILLATOR SW1 K0C115A00007 SEESAW SWITCH Safety Ref No Par...

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