Panasonic KX-TC1872B Service Manual
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Panasonic KX-TC1872B Service Manual

Panasonic KX-TC1872B Service Manual

900mhz cordless answering system
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Telephone Equipment
KX-TC1868B
KX-TC1871B
KX-TC1872B
900MHz Cordless Answering System
Black Version
(for U.S.A.)
© 2000 Kyushu Matsushita Electric Co., Ltd. All
rights
reserved.
distribution is a violation of law.
ORDER NO. KM40008667C1
F11
Unauthorized
copying
and

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  • Page 1 ORDER NO. KM40008667C1 Telephone Equipment KX-TC1868B KX-TC1871B KX-TC1872B 900MHz Cordless Answering System Black Version (for U.S.A.) © 2000 Kyushu Matsushita Electric Co., Ltd. All rights reserved. Unauthorized copying distribution is a violation of law.

  • Page 2: Table Of Contents

    KX-TC1868B / KX-TC1871B / KX-TC1872B CONTENTS Page Page 1 STANDARD BATTERY LIFE 16 CPU DATA (Base Unit) 2 LOCATION OF CONTROLS 17 CPU DATA (Handset) 3 DISPLAYS 18 EXPLANATION OF IC TERMINALS (RF Unit) 4 CONNECTION 19 HOW TO REPLACE FLAT PACKAGE IC...

  • Page 3: Standard Battery Life

    KX-TC1868B / KX-TC1871B / KX-TC1872B 1 STANDARD BATTERY LIFE After your Panasonic battery is fully charged; While in use (TALK) near the base unit* Up to about 6 hours away from the base unit Up to about 4 hours While not in use (Stand-By)

  • Page 4: Location Of Controls

    KX-TC1868B / KX-TC1871B / KX-TC1872B 2 LOCATION OF CONTROLS (Base unit) (Handset)

  • Page 5: Displays

    KX-TC1868B / KX-TC1871B / KX-TC1872B 3 DISPLAYS Both the handset and the base unit show you instructions and information on the displays. These display prompts are shown below. 3.1. Common prompts for the handset and the base unit...
  • Page 6 KX-TC1868B / KX-TC1871B / KX-TC1872B 3.2. Handset only...
  • Page 7 KX-TC1868B / KX-TC1871B / KX-TC1872B 3.3. Base unit only...

  • Page 8: Connection

    4 CONNECTION Note: • USE ONLY WITH Panasonic AC ADAPTOR PQLV1Z. • The AC adaptor must remain connected at all times. (It is normal for the adaptor to feel warm during use.) • If your unit is connected to a PBX which does not support Caller ID and voice mail services, you cannot access those...

  • Page 9: Adding Another Phone

    KX-TC1868B / KX-TC1871B / KX-TC1872B 4.1. Adding Another Phone This unit will not function during a power failure. To connect a standard telephone on the same line, use the Panasonic T-adaptor KX-J66.

  • Page 10: Operation

    KX-TC1868B / KX-TC1871B / KX-TC1872B 5 OPERATION 5.1. Making Calls 5.1.1. With the Handset...
  • Page 11 KX-TC1868B / KX-TC1871B / KX-TC1872B...
  • Page 12 KX-TC1868B / KX-TC1871B / KX-TC1872B 5.1.2. With the Base Unit...
  • Page 13 KX-TC1868B / KX-TC1871B / KX-TC1872B...

  • Page 14: Answering Calls

    KX-TC1868B / KX-TC1871B / KX-TC1872B 5.2. Answering Calls When a call is received, the unit rings and the CALLER ID button on the base unit flashes quickly. If you subscribe to a Caller ID service, the calling party information will be displayed after the first ring. In order to view the Caller ID information, please wait until the second ring to answer a call.

  • Page 15: Automatic Answering Operation

    KX-TC1868B / KX-TC1871B / KX-TC1872B 5.3. Automatic Answering Operation 5.3.1. Setting the Unit to Answer Calls...

  • Page 16: Listening To Messages

    KX-TC1868B / KX-TC1871B / KX-TC1872B 5.4. Listening to Messages...
  • Page 17 KX-TC1868B / KX-TC1871B / KX-TC1872B 5.4.1. During playback...

  • Page 18: Disassembly Instructions

    KX-TC1868B / KX-TC1871B / KX-TC1872B 6 DISASSEMBLY INSTRUCTIONS...
  • Page 19 KX-TC1868B / KX-TC1871B / KX-TC1872B Shown in Fig.- To Remove Remove Lower Cabinet Screws (2.6 X 12)..(A) X 5 Main P.C. Board Remove the P.C. Board Lower Cabinet Screw (3 X 12)..(B) X 1 Screws (3 X 8)..(C) X 3...

  • Page 20: Assembly Instructions

    KX-TC1868B / KX-TC1871B / KX-TC1872B 7 ASSEMBLY INSTRUCTIONS 7.1. Asseembly the LCD to P.C. Board (Base Unit)
  • Page 21 KX-TC1868B / KX-TC1871B / KX-TC1872B 7.2. Asseembly the LCD to P.C. Board (Handset) 7.3. Adjustment to prevent the cabinet from opening at dropping Stick the rubber on the front cabinet as shown in the figure to prevent the cabinet from opening at dropping.

  • Page 22: Troubleshooting Guide

    KX-TC1868B / KX-TC1871B / KX-TC1872B 8 TROUBLESHOOTING GUIDE...

  • Page 23: Check Power

    KX-TC1868B / KX-TC1871B / KX-TC1872B 8.1. Check Power...
  • Page 24 KX-TC1868B / KX-TC1871B / KX-TC1872B 8.2. Error Message Table NOTE: Flash memory is IC751. DSP is IC501...

  • Page 25: Check Record

    KX-TC1868B / KX-TC1871B / KX-TC1872B 8.3. Check Record 8.4. Check Playback...
  • Page 26 KX-TC1868B / KX-TC1871B / KX-TC1872B 8.5. Check Sp-phone Voice Transmission 8.6. Check Sp-phone Voice Reception...
  • Page 27 KX-TC1868B / KX-TC1871B / KX-TC1872B 8.7. Check Battery Charge...

  • Page 28: Check Link

    KX-TC1868B / KX-TC1871B / KX-TC1872B 8.8. Check Link...
  • Page 29 KX-TC1868B / KX-TC1871B / KX-TC1872B 8.9. Check the RF Unit 8.9.1. Finding out the Defective Unit Prepare HS JIG (Handset-jig) and BS JIG (Base Unit-jig). Place the HS JIG on the cradle of the base unit for checking, then confirm that they are linked. Place the handset for checking on the cradle of the BS JIG, then confirm that they are linked.
  • Page 30 KX-TC1868B / KX-TC1871B / KX-TC1872B 8.9.2.2. Base Unit - jig (BS JIG) for Handset The base unit jig uses two modes: NORMAL POWER mode and TEST POWER mode. These modes alternate when the base unit LOCATOR button is pressed: (1) NORMAL POWER mode, TEST SUPER LOW (red) is OFF.
  • Page 31 KX-TC1868B / KX-TC1871B / KX-TC1872B 8.9.3. RF Check Flowchart (*) Details of confirmation items are following in “8.9.4. Check Table for RF Block”.
  • Page 32 KX-TC1868B / KX-TC1871B / KX-TC1872B 8.9.4. Check Table for RF Block Item BS(Base uinit) (*1) HS(Handset) (*1) Link confirmation Procedure 1. Put “HS JIG” on BS. 1. Put HS on “BS JIG”. [NORMAL 2. Set MODE to [NORMAL POWER] position of 2.
  • Page 33 KX-TC1868B / KX-TC1871B / KX-TC1872B 8.9.5. RF-DSP interface signal wave form...
  • Page 34 KX-TC1868B / KX-TC1871B / KX-TC1872B 8.10. Check Handset Voice 8.11. Check Handset Voice Transmission Reception NOTE: When checking the RF UNIT, Refet to 8.9. Check the RF Unit...
  • Page 35 KX-TC1868B / KX-TC1871B / KX-TC1872B 8.12. Check Call ID...

  • Page 36: Test Mode And Adjustment

    KX-TC1868B / KX-TC1871B / KX-TC1872B 9 TEST MODE AND ADJUSTMENT 9.1. Test mode flow chart for Base Unit (*1) See 9.4. Base Unit Reference Drawing (*2) Special check method for Base Unit individually.

  • Page 37: Test Mode Flow Chart For Handset

    KX-TC1868B / KX-TC1871B / KX-TC1872B 9.2. Test mode flow chart for Handset (*1) See 9.5. Handset Reference Drawing (*2) Special check method for Handset individually.

  • Page 38: Base Unit Reference Drawing

    KX-TC1868B / KX-TC1871B / KX-TC1872B 9.3. Adjustment X101 IN case of SS system, Carrier signal frequency directly by Frequency counter, can not be measured because sending signal is spread by PN code. So, the confirmation and adjustment is made under the Continuous Send mode of TEST MODE.
  • Page 39 HANDSET (COMPONENT VIEW) ANT GND VC101 TEST PULL UP...

  • Page 40: Description

    KX-TC1868B / KX-TC1871B / KX-TC1872B 9.6. FREQUENCY TABLE 10 DESCRIPTION 10.1. Frequency The frequency range of 906.00 MHz ~ 923.25 MHz is used. Transmitting and receiving channel between base unit and handset is same frequency. Refer to the Frequency Table.
  • Page 41 KX-TC1868B / KX-TC1871B / KX-TC1872B 10.2.1. TDD Frame Format The TDD frame is 2mS in length, and is composed of two symmetrical 960 µS TX and RX subframes. Each subframe contains 96 bits of 10µS duration, with 40µS guard times between both TX and RX subframes.

  • Page 42: Signal Flowchart In The Whole System

    KX-TC1868B / KX-TC1871B / KX-TC1872B 10.4. Signal Flowchart in the Whole System Reception CN101 of the base unit is connected to the TEL line, and the signal is input through the bridge diode D101. While talking the relay (Q121) is turned ON and amplified at the amplifiers Q461, then led to DSP (IC501). DSP generates ADPCM signal. The ADPCM signal is input to RFIC (IC101) of RF UNIT, and is mixed with pseudo random noise code (PN code) to spread the spectrum.
  • Page 43 KX-TC1868B / KX-TC1871B / KX-TC1872B 10.5. EXPLANATION OF BBIC DATA 10.5.3. Ringing COMMUNICATION 10.5.1. Calling 10.5.2. To Terminate Communication...

  • Page 44: Terminal Guide Of Ic´s, Transistors And Diodes

    KX-TC1868B / KX-TC1871B / KX-TC1872B 11 TERMINAL GUIDE OF IC´S, TRANSISTORS AND DIODES 11.1. Base Unit 11.2. Handset...

  • Page 45: Block Diagram (Base Unit)

    12 BLOCK DIAGRAM (Base Unit)

  • Page 46: New Circuit Operation (Base Unit)

    KX-TC1868B / KX-TC1871B / KX-TC1872B 13 NEW CIRCUIT OPERATION (Base Unit) 13.1. SP-PHONE RX Circuit Circuit Operation: Telephone Line (T/R) → Q131 → C463 → R448 → C442 → R464 → C441 → pin 38 of IC501 → pins 32 and 33 of IC501 →...

  • Page 47: Auto Disconnect Circuit

    KX-TC1868B / KX-TC1871B / KX-TC1872B 13.2. SP-PHONE TX Circuit Circuit Operation: MIC → C724 → C725 → C726 → R726 → pin 47 of IC501 → pin 36 of IC501 → R431 → C432 → C433 → Telephone Line 13.3. Auto Disconnect Circuit...

  • Page 48: Power Supply Circuit

    KX-TC1868B / KX-TC1871B / KX-TC1872B 13.4. Power Supply Circuit Function: Power from the AC adaptor passes through a regulating block consisting of IC301. Circuit Operation: IC401 is a regulated power supply. The voltage at point A is regulated to 4.5 V by IC301.
  • Page 49 KX-TC1868B / KX-TC1871B / KX-TC1872B 13.6. Line Sending Signal The modulation signal input from the RF unit is demodulated by IC501. The audio signal output from IC501-36 and is input to telephone line. 13.7. Line Receiving Signal The audio signal from line passes through Q106 and IC702, and the signal is input to pin 96 of IC502(BBIC).
  • Page 50 KX-TC1868B / KX-TC1871B / KX-TC1872B 13.8. Calling Line Identification Circuit (Caller ID) Function: The caller ID is a chargeable ID which the user of a telephone circuit obtains by entering a contract with the telephone company to utilize a caller ID service. For this reason, the operation of this circuit assumes that a caller ID service contract has been entered for the circuit being used.
  • Page 51 KX-TC1868B / KX-TC1871B / KX-TC1872B lCall Waiting Calling Identity Delivery on Call Waiting (CIDCW) is a CLASS service that allows a customer, while off-hook on an existing call, to receive information about a calling party on a waited call. The transmission of the calling information takes place almost immediately after the customer is alerted to the new call so he/she can use this information to decide whether to take the new call.
  • Page 52 KX-TC1868B / KX-TC1871B / KX-TC1872B 13.9. Parallel Connection Detection Circuit Function: In order to disable call waiting and stutter tone functions when using telephones connected in parallel, it is necessary to have a circuit that judges whether a telephone connected in parallel is in use or not. This circuit determines whether the telephone connected in parallel is on hook or off hook by detecting changes in the T/R voltage.
  • Page 53 KX-TC1868B / KX-TC1871B / KX-TC1872B 13.10. DSP (Digital Speech/Signal Processing) Circuit General Description: (IC501, IC751) is a digital speakerphone/speech/signal processing system that implements all the functions of speech compression, record and playback, and memory management required in a digital telephone answering machine.
  • Page 54 KX-TC1868B / KX-TC1871B / KX-TC1872B 13.11. Greeting Recording Circuit Circuit Operation: MIC → C724 → C725 → C726 → R726 → pin 47 of IC501. 13.12. Greeting Play Back Circuit Circuit Operation: pin36 of IC501 → R431 → C432 → C433 → Telephone Line.
  • Page 55 KX-TC1868B / KX-TC1871B / KX-TC1872B 13.13. ICM Recording Circuit Circuit Operation: Telephone Line → Q131 → C463 → R448 → C442 → R464 → C441 → pin 32 and 33 of IC501. 13.14. ICM Play Circuit Circuit Operation: pins 32 and 33 of IC501 → Speaker.
  • Page 56 KX-TC1868B / KX-TC1871B / KX-TC1872B 13.15. Telephone Line Interface Circuit Operation: l ANSWER In the idle mode, Q121 is open to cut the DC loop current and decrease the ring load. When ring voltage appears at the Tip (T) and Ring (R) leads (When the telephone rings), the AC ring voltage is transferred as follows: T →...
  • Page 57 KX-TC1868B / KX-TC1871B / KX-TC1872B 13.17. Initializing Circuit Function: This circuit is used for 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 IC301, D306 and power is supplied to the DSP.

  • Page 58: Block Diagram (Handset)

    KX-TC1868B / KX-TC1871B / KX-TC1872B 14 BLOCK DIAGRAM (Handset)

  • Page 59: New Circuit Operation (Handset)

    KX-TC1868B / KX-TC1871B / KX-TC1872B 15 NEW CIRCUIT OPERATION (Handset) 15.1. Power Supply Circuit Voltage is supplied separately to each block. 15.2. Charge Circuit Ni-Cd battery is connected to CN202. When the handset is put on the cradle of the base unit, the power is supplied from CHARGE1 and CHARGE2 terminals to charge the battery.

  • Page 60: Sending Signal

    KX-TC1868B / KX-TC1871B / KX-TC1872B 15.3. Ringer Circuit If the ringer volume is set to low and an alarm tone is output from 39 pin, IC201 DSP and input to Q209. Then Q208 is turned off. If the ringer volume is set to high, Q208 turns on and results in a louder beep tone.
  • Page 61 KX-TC1868B / KX-TC1871B / KX-TC1872B 15.5. Reception Signal Circuit The received signal from the base unit is output from pins 33 (SPN) and 32 (SPP) of IC201 (DSP) as the voice signal. SPN is the inverse output of SPP, and the speaker is driven by SPN and SPP. CN203 is the headphone jack. When the headphone is connected to this jack, the output to the speaker of the handset (SPN,SPP) is cut and the voice signal is output to the headphone (HSOUT) only.

  • Page 62: Cpu Data (Base Unit)

    KX-TC1868B / KX-TC1871B / KX-TC1872B 16 CPU DATA (Base Unit) 16.1. IC501...

  • Page 63: Cpu Data (Handset)

    KX-TC1868B / KX-TC1871B / KX-TC1872B 17 CPU DATA (Handset) 17.1. IC201...

  • Page 64: Explanation Of Ic Terminals (Rf Unit)

    KX-TC1868B / KX-TC1871B / KX-TC1872B 18 EXPLANATION OF IC TERMINALS (RF Unit) 18.1. IC101...

  • Page 65: How To Replace Flat Package Ic

    KX-TC1868B / KX-TC1871B / KX-TC1872B 19 HOW TO REPLACE FLAT 19.3. Modification Procedure of Bridge PACKAGE IC 1. Re-solder slightly on bridged portion. 19.1. Preparation 2. Remove remained solder along pins employing soldering • SOLDER iron as shown in below figure.

  • Page 66: Cabinet And Electrical Parts (Base Unit)

    KX-TC1868B / KX-TC1871B / KX-TC1872B 20 CABINET AND ELECTRICAL PARTS (Base Unit)

  • Page 67: Cabinet And Electrical Parts (Handset)

    KX-TC1868B / KX-TC1871B / KX-TC1872B 21 CABINET AND ELECTRICAL PARTS (Handset)

  • Page 68: Accessories And Packing Materials

    KX-TC1868B / KX-TC1871B / KX-TC1872B 22 ACCESSORIES AND PACKING MATERIALS...

  • Page 69: Replacement Parts List

    KX-TC1868B / KX-TC1871B / KX-TC1872B 23 REPLACEMENT PARTS Ref. Part No. Part Name & Description Remarks PQGT14423Z NAME PLATE (for KX-TC1871B) LIST PQGT14406Z NAME PLATE (for KX-TC1872B) PQHG10606Z CUSHION SPONGE This replacement parts list are U.S.A. version only. PQHR10755Z LCD HOLDER...
  • Page 70 KX-TC1868B / KX-TC1871B / KX-TC1872B Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks D121 PQVDRLZ20A DIODE(SI) D122 PQVDRLZ2R0 DIODE(SI) (VARISTORS) SA101 PQVDDSS301L VARISTOR D302 PQVDRLZ8R2 DIODE(SI) SA102 PQVDDSS301L VARISTOR D303 PQVDRLZ8R2 DIODE(SI)
  • Page 71 KX-TC1868B / KX-TC1871B / KX-TC1872B Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R344 ERJ3GEYJ104 100k R779 ERJ3GEYJ103 R345 ERJ3GEYJ224 220k R782 ERJ3GEYJ102 R371 ERJ3GEYJ121 R372 ERJ3GEYJ561 C433 ERJ3GEYJ822 8.2k R373 ERJ3GEYJ220...
  • Page 72 KX-TC1868B / KX-TC1871B / KX-TC1872B Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C442 ECUV1C104KBV C777 ECUV1A474KBV 0.47 C443 ECUV1H101JCV 100P C778 ECUV1A474KBV 0.47 C444 ECUV1C104KBV C779 ECUV1H471JCV 470P C445 ECST0JZ106R C780 ECUV1C473KBV 0.047...
  • Page 73 KX-TC1868B / KX-TC1871B / KX-TC1872B Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks PQHG10527Y RUBBER SHEET LED202 PQVDSML310MT PQHR10726Z LCD HOLDER LED203 PQVDSML310MT PQHR10727Z LCD PLATE LED204 PQVDSML310MT PQHR10739Z SP HOLDER LED205...
  • Page 74 KX-TC1868B / KX-TC1871B / KX-TC1872B Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R245 ERJ3GEYJ103 C289 ECUV1H330JCV R246 ERJ3GEYJ153 R247 ERJ3GEYJ391 C290 ECUV1H102KBV 0.001 R248 ERJ3GEYJ393 C291 ECUV1H102KBV 0.001 R249 ERJ3GEYJ222 2.2k...

  • Page 75: For Schematic Diagram

    KX-TC1868B / KX-TC1871B / KX-TC1872B 24 FOR SCHEMATIC DIAGRAM 24.1. Base Unit (28 SCHEMATIC DIAGRAM (Base Unit)) Notes: 1. DC voltage measurements are taken with voltmeter from the negative voltage line. This schematic diagram may be modified at any time with the development of new technology.

  • Page 76: Circuit Board (Rf Unit)

    KX-TC1868B / KX-TC1871B / KX-TC1872B 25 CIRCUIT BOARD (RF Unit) VC101 C106 C104 X101 TX_ADPCMI R107 R127 C124 C118 RX_ADPCMO C125 C119 R121 PCM_SYNC R129 C111 C126 PCM_BCLK C107 R130 R110 C127 R111 C128 C101 F102 R113 R131 IC101 T101...

  • Page 77: Schematic Diagram (Rf Unit)

    26 SCHEMATIC DIAGRAM (RF Unit) IC101 26.1. MEMO...
  • Page 78 KX-TC1868B / KX-TC1871B / KX-TC1872B...

  • Page 79: Circuit Board (Base Unit)

    KX-TC1868B / KX-TC1871B / KX-TC1872B 27 CIRCUIT BOARD (Base Unit) 27.1. Component View R321 Q601 Q321 R715 Q304 Q341 R903 R332 R331 C332 JGND1 Q342 C342 IC331 R414 RF UNIT R542 R345 R334 C685 C686 R412 C413 J900 Q752 R413...
  • Page 80 KX-TC1868B / KX-TC1871B / KX-TC1872B 27.2. Flow Solder Side View...

  • Page 81: Schematic Diagram (Base Unit)

    KX-TC1868B / KX-TC1871B / KX-TC1872B 28 SCHEMATIC DIAGRAM (Base Unit) Input 1.1kHz 140mVp-p (-25dBm/600Ω) 22mVp-p Output 1000mVp-p 85mVp-p 10.5V 760mVp-p 105mVp-p 4.5V 4.2V IC331 IC751 175mVp-p 215mV 4.2V 4.5V IC301 IC501 4.2V 7.7V 7.4V 4.1V 10.5V 7.6V 255mVp-p 3.6V 960mVp-p -51dBm/600Ω...

  • Page 83: Circuit Board (Handset)

    KX-TC1868B / KX-TC1871B / KX-TC1872B 29 CIRCUIT BOARD (Handset) IC203 IC205 IC201 IC202 IC204...

  • Page 85: Schematic Diagram (Handset)

    KX-TC1868B / KX-TC1871B / KX-TC1872B 30 SCHEMATIC DIAGRAM (Handset) Input 1.1kHz 18mVp-p (-45dBm/600 ) 2.4V 140mVp-p (Headset) Input 1.1kHz 0.45V -43dBm/600 3.0V 90mVp-p (Headset) 0.01u 130mVp-p C294 0.01u IC201 270mVp-p Loud Vol. Mid 490mVp-p IC205 3.3V IC203 3.0V IC202 IC204...
  • Page 87 KX-TC1868B / KX-TC1871B / KX-TC1872B M (W) KXTC1868B KXTC1871B KXTC1872B Printed in Japan...

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