Panasonic KX-TG8421BX Service Manual
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Panasonic KX-TG8421BX Service Manual

Panasonic KX-TG8421BX Service Manual

Digital cordless answering system
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Telephone Equipment
KX-TG8421BX
Model No.
KX-TGA840BX
Digital Cordless Answering System
(for Middle Near East and Africa)
© Panasonic Communications Co., Ltd. 2009.
Unauthorized copying and distribution is a viola-
tion of law.

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  • Page 1 Telephone Equipment KX-TG8421BX Model No. KX-TGA840BX Digital Cordless Answering System (for Middle Near East and Africa) © Panasonic Communications Co., Ltd. 2009. Unauthorized copying and distribution is a viola- tion of law.

  • Page 2: Technical Descriptions

    KX-TG8421BX/KX-TGA840BX 1 Technical Descriptions 1.1. Block Diagram (Base Unit)
  • Page 3 KX-TG8421BX/KX-TGA840BX 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): IC7 - Handling all the audio, signal and data processing needed in a DECT base unit...

  • Page 4: Power Supply Circuit

    KX-TG8421BX/KX-TGA840BX 1.2.2. Power Supply Circuit The power is supplied to the DECT BBIC, RF Module, EEPROM and Charge Contact from AC Adaptor (+6.5 V) as 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→...

  • Page 5: Transmitter Block

    KX-TG8421BX/KX-TGA840BX 1.2.3. Telephone Line Interface <Function> • Bell signal detection • Clip signal detection • ON/OFF hook circuit Bell & Clip (: Calling Line Identification Presentation: Caller ID) signal detection: In the standby mode, Q3 is open to cut the DC loop current and decrease the ring load.

  • Page 6: Block Diagram (Handset)

    KX-TG8421BX/KX-TGA840BX 1.3. Block Diagram (Handset)

  • Page 7: Power Supply Circuit/Reset Circuit

    KX-TG8421BX/KX-TGA840BX 1.4. Circuit Operation (Handset) 1.4.1. Outline Handset consists of the following ICs as shown in Block Diagram (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-TG8421BX/KX-TGA840BX 1.5. Circuit Operation (Charger Unit) 1.5.1. Power Supply Circuit The power supply is as shown.

  • Page 9: Signal Route

    KX-TG8421BX/KX-TGA840BX 1.6. Signal Route...
  • Page 10 KX-TG8421BX/KX-TGA840BX...

  • Page 11: For Schematic Diagram

    KX-TG8421BX/KX-TGA840BX 2 Schematic Diagram 2.1. For Schematic Diagram 2.1.1. Base Unit (Schematic Diagram (Base 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.

  • Page 12: Schematic Diagram (Base Unit)

    KX-TG8421BX/KX-TGA840BX 2.2. Schematic Diagram (Base Unit) ANT1_TP ANT2_TP ANT_1 ANT_2 C851 C853 W 0.15mm W 0.15mm L 22+/-4mm L 22+/-4mm Beep 1st or 4th layer 1st or 4th layer Bell signal DA802 *R86 W 0.15mm L 22+/-4mm 1st or 4th layer W 0.15mm...
  • Page 13 KX-TG8421BX/KX-TGA840BX .QQR %WTTGPV .+0'A&% 4 & M  0% )0& )0& )0& % 4 62 )0& 4 M 4 M M )0& )0& )0& )0& )0& 8 / )0& )0& 8 M )0& )0& )0& )0& )0& *#-A%. )0& )0&...
  • Page 14 KX-TG8421BX/KX-TGA840BX 2.3. Schematic Diagram (Base Unit_Operation) 2APVCC LED902 MEG_LED LED901 ANS_LED KEYS_B KEYIN1 KEYIN2 KEYIN3 KEYS_C KEYS_D KEYS_E ANS1 ERASE MSG2 SKIP MSG1 DOWN LOCAT/INT STOP...
  • Page 15 KX-TG8421BX/KX-TGA840BX Memo...

  • Page 16: Schematic Diagram (Handset)

    KX-TG8421BX/KX-TGA840BX 2.4. Schematic Diagram (Handset) Charge Current BATTERY BATT+ 5.6n C1 CP1 BATTERY 6.3V 330u To Battery C150 R330 BATT- C331 R331 C2 CP2 6.3V C332 330u R332 X_CLK 2.5V 4.0V CP+2.5V CP+4.0V CP2.5V CP4.0V 1.2k 3.9k K10u CHG(+) K0.1u...
  • Page 17 KX-TG8421BX/KX-TGA840BX 9 OO .  OO 8 TF NC[GT /#:O# 4 4:10 8 8 . % )0& % 4:A4( -W #06A62 )0& 4(A4:P % % R )0& &# 4(A4:R )0& 9 OO )0& )0& )0& )0& )0& )0& )0& . OO...

  • Page 18: Schematic Diagram (Charger Unit)

    KX-TG8421BX/KX-TGA840BX 2.5. Schematic Diagram (Charger Unit) R1 10 SCHEMATIC DIAGRAM (Charger Unit)

  • Page 19: Printed Circuit Board

    KX-TG8421BX/KX-TGA840BX 3 Printed Circuit Board 3.1. Circuit Board (Base Unit_MAIN) 3.1.1. Component View 4 4 % 4 % % 4 % % % % % 4 4 4 % % 4 4 & % 4 & % % & %...

  • Page 20: Bottom View

    KX-TG8421BX/KX-TGA840BX 3.1.2. Bottom View &% &% 8&& %28 /*< %*) 8&& 8 %*)
  • Page 21 KX-TG8421BX/KX-TGA840BX 3.2. Circuit Board (Base Unit_Operation) 3.2.1. Component View 20.$< -:6)* .'& '4#5' #05 .'& /5) /5) 5-+2 5612 .1%#6+06 &190 -';5A' -';5A% -';+0 -';5A$ /')A.'& -';5A& -';+0 -';+0 #05A.'& #28%%...
  • Page 22 KX-TG8421BX/KX-TGA840BX Memo...

  • Page 23: Circuit Board (Handset)

    KX-TG8421BX/KX-TGA840BX 3.3. Circuit Board (Handset) 3.3.1. Component View 20.$< -:6)#:: '7 4'%'+8'4 4%8 4%8 % % & & % . 52'#-'4 % % % % % +% 4'& % & & 4 . % 4 4 ,6#) 4 6'56 %...
  • Page 24 KX-TG8421BX/KX-TGA840BX 3.3.2. Bottom View .'& 20.$< -:6)#:: '7 % 51(6A% 51(6A# 6#.- .'& .'& .'& .'& .'& .'& %#4$10A%. /+% /+%...

  • Page 25: Circuit Board (Charger Unit)

    KX-TG8421BX/KX-TGA840BX 3.4. Circuit Board (Charger Unit) 3.4.1. Component View CIRCUIT BOARD (Charger unit (Component View)) 3.4.2. Bottom View TP4 (GND) CIRCUIT BOARD (Charger unit (Bottom View))

  • Page 26: Exploded View And Replacement Parts List

    KX-TG8421BX/KX-TGA840BX 4 Exploded View and Replacement Parts List 4.1. Replacement Part List Safety Ref. Part No. Part Name & Description Remarks 1. RTL (Retention Time Limited) F1K2H681A008 680P Note: ECUE1E472KBQ 0.0047 PQCUV1A225KB 2.2 The “RTL” marking indicates that its Retention Time is ERJ3GEYJ682 6.8k...
  • Page 27 KX-TG8421BX/KX-TGA840BX Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks C810 F1G1H2R2A480 2.2P ERJ2GEYJ474 470k C811 ECUE1H100DCQ 10p ERJ2GEJ121 C812 ECUE1H100DCQ 10p ERJ3GEYJ820 C813 F1G1H2R2A480 2.2P ERJ3GEYJ821 C814 ECUE1H332KBQ 0.0033 ERJ2GEJ823...
  • Page 28 KX-TG8421BX/KX-TGA840BX 4.1.2. Handset Safety Ref. Part No. Part Name & Description Remarks 4.1.2.1. Main P.C.Board Parts ERJ2GEJ820 ERJ2GEJ820 R203 D0GA563ZA006 56k R208 ERJ2GE0R00 Safety Ref. Part No. Part Name & Description Remarks R209 ERJ2GE0R00 R215 ERJ2GE0R00 PCB100 PNWPGA840BXR MAIN P.C.BOARD...
  • Page 29 KX-TG8421BX/KX-TGA840BX Safety Ref. Part No. Part Name & Description Remarks C188 ECUE0J105KBQ 1 C331 ECUE0J105KBQ 1 C332 ECUE0J105KBQ 1 C802 F1G1H2R0A480 2.0p C803 F1G1H1R5A480 1.5p C804 F1G1H2R0A480 2.0p C805 F1G1H3R3A480 3.3p C806 F1G1H3R3A480 3.3p C808 ECUE1A104KBQ 0.1 C809 ECUE1H100DCQ 10p C810 F1G1H1R6A480 1.6p...

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