Panasonic KX-TG6451BX Service Manual
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Panasonic KX-TG6451BX Service Manual

Panasonic KX-TG6451BX Service Manual

Telephone equipment
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Telephone Equipment
KX-TG6451BX
Model No.
KX-TGA641BX
(for Asia, Middle Near East and other areas)
© Panasonic Communications Co., Ltd. 2009. Unau-
thorized copying and distribution is a violation of law.

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Summary of Contents for Panasonic KX-TG6451BX

  • Page 1 Telephone Equipment KX-TG6451BX Model No. KX-TGA641BX (for Asia, Middle Near East and other areas) © Panasonic Communications Co., Ltd. 2009. Unau- thorized copying and distribution is a violation of law.

  • Page 2: Technical Descriptions

    KX-TG6451BX/KX-TGA641BX 1 Technical Descriptions 1.1. Block Diagram (Base Unit)
  • Page 3 KX-TG6451BX/KX-TGA641BX 1.2. Circuit Operation (Base Unit) 1.2.1. Outline Base unit consists of the following ICs as shown in Block Diagram (Base Unit) (P.2). • DECT BBIC (Base Band IC): IC501 - Handling all the audio, signal and data processing needed in a US DECT base unit...

  • Page 4: Power Supply Circuit

    KX-TG6451BX/KX-TGA641BX 1.2.2. Power Supply Circuit The power is supplied to the BBIC,TAM Companion,Power AMP,LCD module,EEPROM,Flash Memory,LED,LCD backlight from AC Adaptor(+6.5V) as shown in Fig 1. When power line failure, the power is supplied to BBIC,TAM companion,EEPROM from telephone line instead of AC Adaptor through D138 and Q341.

  • Page 5: Pulse Dialling

    KX-TG6451BX/KX-TGA641BX 1.2.3. Telephone Line Interface Function • Bell signal detection • CLIP signal detection • ON/OFF hook and pulse dial circuit Bell & CLIP (Calling Line Identification Presentation: Caller ID) signal detection: In standby mode,Q111/Q115 is open to cut the DC Loop current and decrease the ring load.
  • Page 6 KX-TG6451BX/KX-TGA641BX 1.3. Block Diagram (Cordless Handset)

  • Page 7: Power Supply Circuit/Reset Circuit

    KX-TG6451BX/KX-TGA641BX 1.4. Circuit Operation (Cordless Handset) 1.4.1. Outline Cordless Handset consists of the following ICs as shown in Block Diagram (Cordless Handset) (P.6). • DECT BBIC (Base Band IC): IC1 - All data signals (forming/analyzing ACK or CMD signal) - All interfaces (ex: Key, Detector Circuit, Charge, DC/DC Converter, EEPROM, LCD, RF Power Amp.)

  • Page 8: Circuit Operation (Charger Unit)

    KX-TG6451BX/KX-TGA641BX 1.5. Circuit Operation (Charger Unit) 1.5.1. Power Supply Circuit The power supply is as shown.

  • Page 9: For Schematic Diagram

    KX-TG6451BX/KX-TGA641BX 2 Schematic Diagram 2.1. For Schematic Diagram 2.1.1. Base Unit (Schematic Diagram (Base Unit_Main)) 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.
  • Page 10 KX-TG6451BX/KX-TGA641BX 2.2. Schematic Diagram (Base Unit_Main) +3.2V_PD VDD_flash_LCD CP_VOUT1 VDD4 R386 R387 *Q541 TAM_WP *R542 TAM_WP *HOLD SPI_CLK SPI_DO *IC541 SPI_DI FLASH_CSn +3.2V_PD +1.8V L201 TAM_EN TAM_RESET L202 R202 TAM_RESET C218 TAM_EN C219 SPI2_CLK C220 SPI2_DI C221 SPI2_DO C222 SPI2_CLK...
  • Page 11 KX-TG6451BX/KX-TGA641BX CDL Tx (to Tel line) CDL Rx (from Tel line) SP_Phone Tx (to Tel line) SP_Phone Rx (from Tel line) (Corded) Handset Tx (to Tel line) (Corded) Handset Rx (from Tel line) Bell Bell (Power fail) CLIP LINE_DC Q111 +1.8V...
  • Page 12 KX-TG6451BX/KX-TGA641BX 2.3. Schematic Diagram (Base Unit_RF Part) TP_ANT1 TP_ANT2 C863 C862 8.2n 3.3n W 0.15mm W 0.15mm L 21.5mm L 21.5mm C852 C853 4th layer 4th layer R808 C854 R809 ANT1 ANT2 W 0.15mm L 15.6mm 3rd layer C850 C851 C855 1.8mm 1st layer...
  • Page 13 KX-TG6451BX/KX-TGA641BX 2.4. Schematic Diagram (Base Unit_Operation) LCD BACKLIGHT *R901 *LED901 *LED902 *R902 *LED903 *R903 CN901-7 SP-PHONE_LED *LED904 LED911 *R904 CN902-11 ANS_LED *LED912 CN902-14 *LED913 NEWMES_LED CN902-12 KEY5 CN902-13 KEY4 CN901-14 KEY3 CN901-4 KEY2 CN902-4 KEY1 CN901-3 KEY0 CN902-3 CN901-13 HOOK_DET...

  • Page 14: Schematic Diagram (Cordless Handset)

    KX-TG6451BX/KX-TGA641BX 2.5. Schematic Diagram (Cordless Handset) Charge Current BATTERY 5.6n BATT+ 1.8V BATTERY (MAX500mA) C150 BATTERY +1.8V 1.8V BATT- study to X_CLK 3.0V 4.0V CP+3.0V CP+4.0V 3.9k CHG(+) CHARGE Terminal K10u POWER *C38 K10u CHG(-) +1.8V D10p D10p GND_0 K0.1u...
  • Page 15 KX-TG6451BX/KX-TGA641BX W 0.15mm L 20+/-2mm 3rd layer R807 RXON L801 C827 TP_ANT1 RX_RF C826 C803 RF_RXn *C859 1.5p DA801 RF_RXp W 0.125mm L 7.6mm CP+3.0V Gap 0.125mm W 0.15mm W 0.15mm 1st layer L 5.0mm L 5.0mm 1st layer 1st layer C172 K0.1u...

  • Page 16: Schematic Diagram (Charger Unit)

    KX-TG6451BX/KX-TGA641BX 2.6. Schematic Diagram (Charger Unit) 12 (2W)

  • Page 17: Printed Circuit Board

    KX-TG6451BX/KX-TGA641BX 3 Printed Circuit Board 3.1. Circuit Board (Base Unit_Main) 3.1.1. Component View C852 C853 ANT2 ANT1 C102 DA802 C172 C385 R172 D172 C101 IC304 D173 C804 L103 SA101 C802 Q121 C860 C144 X511 D111 L801 SA103 DA801 D112 R144...

  • Page 18: Bottom View

    KX-TG6451BX/KX-TGA641BX 3.1.2. Bottom View ANT2 ANT1 KX-TG106x/645x/646x PNLPTG106x/645x/646x TP_ANT2 TP_ANT1 PNLB1117Y C854 C850 C855 C851 R809 R808 RING RING Q608 R380 VDD5 VDD5 R382 (3.75V) DCINM R381 DCINM VDD2 IC303 C371 VDD2 DCINP LINE_DC (2.5V) DCINP C361 (+6.5V) TP10 C154...
  • Page 19 KX-TG6451BX/KX-TGA641BX 3.2. Circuit Board (Base Unit_Operation) 3.2.1. Component View C937 C938 R936 C932 R937 C933 R939 C934 R938 C935 R940 C931 R941 R931 R935 R934 R933 C936 R932...
  • Page 20 KX-TG6451BX/KX-TGA641BX 3.2.2. Bottom View SW901...
  • Page 21 KX-TG6451BX/KX-TGA641BX 3.3. Circuit Board (Cordless Handset) 3.3.1. Component View PNLB1103Z TP_ANT1 KX-TGA641 EUDECT KX-TGA106 USDECT RCV+ RECEIVER RCV- RED (EU) BLACK (EU) BLUE (US) WHITE (EU) C70 C152 C71 C138 C139 BLACK L804 C863 C864 C811 C814 C804 C813 R208...
  • Page 22 KX-TG6451BX/KX-TGA641BX 3.3.2. Bottom View PNLB1103Z KX-TGA641 EUDECT KX-TGA106 USDECT SOFT_A SOFT_B SOFT_C TALK LED8 LED6 DOWN...

  • Page 23: Circuit Board (Charger Unit)

    KX-TG6451BX/KX-TGA641BX 3.4. Circuit Board (Charger Unit) 3.4.1. Component View 3.4.2. Bottom View TP4 (GND)

  • Page 24: Exploded View And Replacement Parts List

    KX-TG6451BX/KX-TGA641BX 4 Exploded View and Replacement Parts List 4.1. Replacement Parts List 1. RTL (Retention Time Limited) Safety Ref. Part No. Part Name & Description Remarks Note: C152 ECJ0EB0J224K 0.22 The “RTL” marking indicates that its Retention Time is C154 ECJ0EB0J224K 0.22...
  • Page 25 KX-TG6451BX/KX-TGA641BX Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks C523 ECUE1A104KBQ 0.1 L103 G1A102BA0002 COIL C531 ECUV1H104KBV 0.1 L201 PQLQR1WT COIL C533 ECUV1A105KBV 1 L202 PQLQR1WT COIL C562 ECUE1A104KBQ 0.1...
  • Page 26 KX-TG6451BX/KX-TGA641BX 4.1.1.2. Operational P.C.Board parts Safety Ref. Part No. Part Name & Description Remarks R185 ERJ2GEJ102 R186 ERJ2GEJ102 Safety Ref. Part No. Part Name & Description Remarks R187 ERJ2GEJ104 100k R191 ERJ3GEYJ184 180k PCB2 PNWP26451FXH OPERATIONAL P.C.BOARD ASS'Y (RTL) R192...
  • Page 27 KX-TG6451BX/KX-TGA641BX Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks ECUE1H100DCQ 10p LED4 B3ACB0000216 LED ECUE1A104KBQ 0.1 LED5 B3ACB0000216 LED ECUE1A104KBQ 0.1 LED6 B3ACB0000216 LED ECUE1H100DCQ 10p LED7 B3ACB0000216 LED ECUV1A105KBV 1...
  • Page 28 KX-TG6451BX/KX-TGA641BX 4.1.3. Charger Unit 4.1.3.1. Main P.C.Board Parts Safety Ref. Part No. Part Name & Description Remarks PCB200 PQWPTGA641CH MAIN P.C.BOARD ASS'Y (RTL) K2ECYB000001 JACK ERG2SJ120 K5H302Y00003 FUSE...

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