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Panasonic KX-TC1743B Service Manual
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Panasonic KX-TC1743B Service Manual

Panasonic KX-TC1743B Service Manual

Telephone equipment
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ORDER NO. KM40104791C1
F11
Telephone Equipment
KX-TC1743B / KX-TC1743F / KX-TC1743G / KX-TC1743W / KX
-TC1743PW
900MHz Digital Cordless Answering System
Black Version
Blue Version
Green Version
White Version
Pearl White Version
(for U.S.A.)
SPECIFICATIONS
1

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Summary of Contents for Panasonic KX-TC1743B

  • Page 1 ORDER NO. KM40104791C1 Telephone Equipment KX-TC1743B / KX-TC1743F / KX-TC1743G / KX-TC1743W / KX -TC1743PW 900MHz Digital Cordless Answering System Black Version Blue Version Green Version White Version Pearl White Version (for U.S.A.) SPECIFICATIONS...

  • Page 2: Standard Battery Life

    1. STANDARD BATTERY LIFE...

  • Page 3: Location Of Controls

    2. LOCATION OF CONTROLS 2.1. Base unit...
  • Page 4 2.2. Handset...
  • Page 5 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. Handset...
  • Page 7 3.2. Base unit...
  • Page 9 4. CONNECTIONS Note: - USE ONLY WITH Panasonic AC ADAPTOR KX-TCA1-G.

  • Page 10: Adding Another Phone

    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. 5. OPERATION 5.1. Making Calls 5.1.1. With the Handset...
  • Page 14 5.1.2. With the Base Unit (Digital Duplex Speakerphone)

  • Page 17: Answering Calls

    5.2. Answering Calls When a call is received, the unit rings and the CALLER ID indicator on the base unit flashes...

  • Page 18: Automatic Answering Operation

    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. 5.2.1. With the Handset 5.2.2.

  • Page 19: Listening To Messages

    5.3.1. Setting the Unit to Answer Calls 5.4. Listening to Messages...
  • Page 20 5.4.1. During playback...
  • Page 22 6. DISASSEMBLY INSTRUCTIONS...
  • Page 24 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 Antenna Screw (2.6 X 12)..(B) X 1 Speaker Screws (3 X 8)..(C) X 3 Battery Cover Remove the Battery Cover Rear Cabinet Screws (2.6 X 12)..(D) X 2 Rear Cabinet...

  • Page 25: Troubleshooting Guide

    7. ASSEMBLY INSTRUCTIONS 7.1. Assembly the LCD to P.C. Board (Handset) 8. TROUBLESHOOTING GUIDE...
  • Page 26 Cross Reference: Check Power Error Message Table Check Record Check Playback Check Sp-phone Transmission Check Sp-phone Reception Check Battery Charge Check Link Check the RF Unit Check Handset Transmission Check Handset Reception Check Call ID...

  • Page 27: Check Power

    8.1. Check Power Cross Reference: Power Supply Circuit Reset Circuit NOTE: Flash Memory is IC300. DSP is IC201. 8.2. Error Message Table...

  • Page 28: Check Record

    NOTE: Flash Memory is IC300. DSP is IC201. 8.3. Check Record Cross Reference: Telephone Line Interface Auto Disconnect Circuit Parallel Connection Detect Circuit Signal Route NOTE: Flash Memory is IC300. DSP is IC201. 8.4. Check Playback...
  • Page 29 Cross Reference: Power Supply Circuit NOTE: Flash Memory is IC300. DSP is IC201. 8.5. Check Sp-phone Transmission Cross Reference: Telephone Line Interface Signal Route NOTE: Flash Memory is IC300. DSP is IC201. 8.6. Check Sp-phone Reception...

  • Page 30: Check Battery Charge

    Cross Reference: Telephone Line Interface Signal Route NOTE: Flash Memory is IC300. DSP is IC201. 8.7. Check Battery Charge...

  • Page 31: Check Link

    NOTE: Flash Memory is IC300. DSP is IC201. 8.8. Check Link...
  • Page 32 (*1) Refer to Finding out the Defective Unit Cross Reference: Check the RF Unit Power Supply Circuit Power Supply Circuit NOTE: Flash Memory is IC300. DSP is IC201. 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) 2). Place the HS JIG on the cradle of the base unit for checking, then confirm that they are linked.
  • Page 33 key at the same time within 5 seconds after Power supply the portable unit. Refer to fixation CH table, figure 1 for the key. This test simulates the handset is at very large distance from the base unit and the TX signal from handset to base is very small. Procedure: First place handset jig on base under test to charge (exchange security code);...
  • Page 34 * KX-TC1743 is used as the jig. 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. (1) NORMAL POWER mode. This test simulates the handset is at normal/close distance. The base unit is in NORMAL POWER mode right after the AC adapter has been inserted.
  • Page 35 production set also can be used as a JIG. Fig. Using TC1703 Handset-jig. * KX-TC1703 is used as the jig. 8.9.3. RF Check Flowchart...
  • Page 36 : Details of confirmation items are following in “Check Table for RF Block ()”. NOTE: Flash Memory is IC300. DSP is IC201. 8.9.4. Check Table for RF Block...
  • Page 37 Item BS (Base uinit) (*1) HS (Handset) (*1) 1. Put “HS JIG” on BS. 1. Put HS on “BS JIG”. 1a. Link Procedure 2. Set MODE to [NORMAL POWER] position of 2. Set MODE to [NORMAL POWER] position confirmation “HS JIG“. “BS JIG“.
  • Page 38 NOTE: Flash Memory is IC300. DSP is IC201. 8.9.5. RF-DSP interface signal wave form...

  • Page 39: Test Mode

    8.10. Check Handset Transmission Cross Reference: Signal Route 8.11. Check Handset Reception Cross Reference: Signal Route NOTE: When checking the RF UNIT, Refer to Check the RF Unit 8.12. Check Call ID Cross Reference: Telephone Line Interface Calling Line Identification (Caller ID)/Call Waiting Caller ID Note: - Make sure the format of the Caller ID or Call Waiting Caller ID service of the Telephone company that the customer subscribed to.
  • Page 40 (*1) See Base Unit Reference Drawing () - Should return to OPEN after entering the Test mode. (*2) While the Tele line is connected, the “Caller ID” LED is ON/OFF as well. (*3) It shows whether the telephone line is connected or not. -ON: OFF HOOK.
  • Page 41 9.3. Test mode flow chart for Handset...
  • Page 42 (*1) See Handset Reference Drawing ( ).---Should return to OPEN after entering the Test mode. 9.4. X101 Check The confirmation is made under the Continuous Send mode of TEST MODE. Equipment: Frequency counter TP for adjustment: TP_ANT Measure range: 902.713 MHz ± 5 kHz (1ch) at Test Standby mode in TEST MODE 9.5.
  • Page 43 10. DESCRIPTION 10.1. Frequency The frequency range of 902.713 MHz ~ 927.289 MHz is used. Transmitting and receiving channel between base unit and handset is same frequency. Refer to the Frequency Table. 10.2. Time Division Duplex (TDD) operation Transmission/reception between the base unit and handset is performed by time-sharing as shown in Fig.
  • Page 44 - A 2-bit Preamble field - An 8-bit Data Channel field - An 16-bit Sync Word - A 72-bit ADPCM Payload (CRC 8-bit) 10.3. Signal Flowchart in the Whole System Reception CN1 of the base unit is connected to the TEL line, and the signal is input through the bridge diode D101.
  • Page 45 11. EXPLANATION OF BBIC (Base Band IC) DATA COMMUNICATION 11.1. Calling...
  • Page 46 11.2. To Terminate Communication 11.3. Ringing...

  • Page 47: Block Diagram (Base Unit)

    11.4. Ports for Transmitting and Receiving of Data 12. BLOCK DIAGRAM (Base Unit) 13. CIRCUIT OPERATION (Base Unit) General Description:...
  • Page 48 (DSP, Flash Memory) 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. The DSP system is fully controlled by a host processor DSP. The host processor provides activation and control of all that functions as follows.

  • Page 49: Power Supply Circuit

    ex: Telephone Directory number, Caller ID data, ID code - Settings ex: message numbers, caller ID numbers, pulse tone dial 13.3. Power Supply Circuit Function: The power supply voltage from AC adaptor is converted to the desired voltage of each block. Circuit Operation: This unit supplies the voltage to each block as shown below.
  • Page 50 Circuit Operation: When the AC Adaptor is inserted into the unit, then the voltage is shifted by IC100, D101 and power is supplied to the DSP. The set can operate beyond point in the circuit voltage diagram. 13.5. Locator/Intercom Mode 1.

  • Page 51: Telephone Line Interface

    4. The transmission signal flows: C235, C236 R213, R214 pins 46 and 47 of IC201 13.6. Telephone Line Interface Telephone Line Interface Circuit: Function - Bell signal detection - ON/OFF hook and pulse dial circuit - Side tone circuit - Auto-disconnect circuit/Parallel connection detection circuit Bell signal detection and OFF HOOK circuit: In the idle mode, Q4 is open to cut the DC loop current and decrease the ring load.

  • Page 52: Auto Disconnect Circuit

    13.7. Auto Disconnect Circuit Function: This circuit is used to detect the fact that another telephone connected to the same line is OFF- HOOK while the unit is in a receiving status or OGM transmitting status. Circuit Operation: The voltage DCIN of DSP is monitored. If a parallel-connected telephone is put into an OFF HOOK status, the presence/absence of a parallel connection is determined when the voltage changes by 0.2V or more.

  • Page 53: Signal Route

    off hook by detecting changes in the T/R voltage. Circuit Operation: Parallel connection detection when on hook: When on hook Q7 is ON, the voltage is monitored DCIN of DSP. There is no parallel connection if the voltage is 1.65 V or higher, while a parallel connection is deemed to exist if the voltage is lower.
  • Page 54 13.10. Calling Line Identification (Caller ID)/Call Waiting Caller ID Function: Caller ID 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 55 Call Waiting Caller ID 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 56: Block Diagram (Handset)

    14. BLOCK DIAGRAM (Handset)

  • Page 57: Circuit Operation (Handset)

    15. CIRCUIT OPERATION (Handset) 15.1. Construction The circuit mainly consists of DSP and RF unit as shown in the block diagram. 15.1.1. DSP:IC201 Function - Battery Low, Power down defect circuit - Ringer Generation - Interface circuit RF unit, speaker, mic, LED, Key scan, LCD, Headset 15.1.2.

  • Page 58: Charge Circuit

    15.1.3. EEPROM: IC201 All setting data is stored. ex: ID code, user setting (Flash Time, Tone/Pulse) 15.2. Power Supply Circuit Voltage is supplied separately to each block. 15.3. 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 59: Reception Signal

    15.5. Sending Signal The voice signal from the microphone input to DSP (46-47). CN203 is the headphone jack. When the headphone is connected, the Q206 detect it. The input from the microphone of the handset (MIN, MIP) is cut and the microphone signal from the headphone is input to DSP (36). Also the power for the microphone is supplied from Q211, and the power is turned OFF on standby.

  • Page 60: Cpu Data (Base Unit)

    16. CPU DATA (Base Unit) 16.1. IC201...

  • Page 61: Cpu Data (Handset)

    17. CPU DATA (Handset) 17.1. IC201...

  • Page 62: Explanation Of Ic Terminals (Rf Unit)

    18. EXPLANATION OF IC TERMINALS (RF Unit) 18.1. IC101...

  • Page 64: How To Replace Flat Package Ic

    19. HOW TO REPLACE FLAT PACKAGE IC 19.1. Preparation - SOLDER Sparkle Solder 115A-1, 115B-1 or Almit Solder KR-19, KR-19RMA - Soldering iron Recommended power consumption will be between 30 W to 40 W. Temperature of Copper Rod 662 ± 50°F (350 ± 10°C) (An expert may handle between 60 W to 80 W iron, but beginner might damage foil by overheating.) - Flux...

  • Page 65: Cabinet And Electrical Parts (Base Unit)

    3. Solder employing specified solder to direction of arrow, as sliding the soldering iron. 19.3. Modification Procedure of Bridge 1. Re-solder slightly on bridged portion. 2. Remove remained solder along pins employing soldering iron as shown in below figure. 20. CABINET AND ELECTRICAL PARTS (Base Unit)

  • Page 66: Cabinet And Electrical Parts (Handset)

    21. CABINET AND ELECTRICAL PARTS (Handset)

  • Page 67: Accessories And Packing Materials

    22. ACCESSORIES AND PACKING MATERIALS...

  • Page 68: Terminal Guide Of Ic's, Transistors And Diodes

    23. TERMINAL GUIDE OF IC'S, TRANSISTORS AND DIODES 23.1. Base Unit 23.2. Handset...

  • Page 69: Replacement Parts List

    24. REPLACEMENT PARTS LIST This replacement parts list are U.S.A. version only. Note: 1. RTL (Retention Time Limited) The marking (RTL) indicates that the Retention Time is limited for this item. After the discontinuation of this assembly in production, the item will continue to be available for a specific period of time.
  • Page 70 12 KEY RUBBER SWITCH (for KX-TC1743B) PQSX10172W 12 KEY RUBBER SWITCH (for KX-TC1743F) (for KX-TC1743G) PQSX10172Y 12 KEY RUBBER SWITCH (for KX-TC1743W) PQSX10172X 12 KEY RUBBER SWITCH (for KX-TC1743PW) PQSX10173Z TAM KEY RUBBER SWITCH (for KX-TC1743B) (for KX-TC1743F) (for KX-TC1743G)
  • Page 71 Ref. No. Part No. Part Name & Description Remarks PQSX10173Y TAM KEY RUBBER SWITCH (for KX-TC1743W) PQSX10173X TAM KEY RUBBER SWITCH (for KX-TC1743PW) PQUS10285Z HOOK SPRING PQHS10327Z LCD TAPE 24.1.2. MAIN P.C. BOARD PARTS Ref. No. Part No. Part Name & Description Remarks PCB1 PQWPTC1743BH MAIN P.C.BAORD ASS'Y (RTL)
  • Page 72 Ref. No. Part No. Part Name & Description Remarks L200 PQLQR2KA213 COIL L201 PQLQR4RB601D COIL (SUARGE ABSORBERS) PQVDDSS301L SURGE ABSORBER PQVDDSS301L SURGE ABSORBER (OTHERS) PQJJ2H003Z JACK SOCKET PQJM147Y MICROPHONE PQMG10023Z CUSHION RUBBER, MIC G401 PQJT10152Z CHARGE TERMINAL G402 PQJT10152Z CHARGE TEMRINAL G403 PQJT10152Z CHARGE TERMINAL...
  • Page 73 Ref. No. Part No. Part Name & Description Remarks R116 ERJ3GEY0R00 R117 ERJ3GEY0R00 R118 ERJ3GEYJ102 R150 ERJ3GEYJ104 100k R151 ERJ3GEYJ561 R152 ERJ3GEYJ331 R153 ERDS1TJ100 R157 ERDS1TJ391 R159 ERJ3GEYJ103 R160 ERJ3GEYJ563 R161 ERJ3GEYJ563 R200 ERJ3GEYJ101 R201 ERJ3GEYJ101 R203 ERJ3GEYJ473 R204 ERJ3GEYJ391 R205 ERJ3GEYJ391 R206...
  • Page 74 Ref. No. Part No. Part Name & Description Remarks ECUV1H101JCV 100P ECUV1H103KBV 0.01 ECEA1HKA010 ECUV1H103KBV 0.01 ECUV1H681JCV 680P ECUV1H681JCV 680P ECUV1H103KBV 0.01 PQCUV1A684KB 0.68 PQCUV1H154KR 0.15 PQCUV1H154KR 0.15 ECKD2H681KB 680P ECKD2H681KB 680P ECUV1C104KBV 0.1 ECUV1H102KBV 0.001 ECUV1C104KBV 0.1 ECEV0JA220 C100 ECUV1C104ZFV C101 ECEV0JA101...
  • Page 75 Ref. No. Part No. Part Name & Description Remarks C305 ECUV1H101JCV 100P C306 ECUV1H101JCV 100P C307 ECUV1H101JCV 100P C308 ECUV1C104ZFV C309 ECUV1C104ZFV C310 ECUV1H101JCV 100P C311 ECUV1H101JCV 100P C312 ECUV1H101JCV 100P C313 ECUV1H101JCV 100P C315 ECUV1H101JCV 100P C401 ECUV1H103KBV 0.01 C403 ECUV1H330JCV C404...
  • Page 76 FRONT CABINET (for KX-TC1743G) PQKM10493Z2 FRONT CABINET (for KX-TC1743P) PQKM10493X3 FRONT CABINET (for KX-TC1743PW) PQP504SVC BATTERY PQSA10102X ANTENNA (for KX-TC1743B) (for KX-TC1743F) (for KX-TC1743G) PQSA10102W ANTENNA (for KX-TC1743W) PQSA10102V ANTENNA (for KX-TC1743PW) PQSX10174Z KEY RUBBER SWITCH (for KX-TC1743B) PQSX10174T KEY RUBBER SWITCH (for KX-TC1743F) (for KX-TC1743G)
  • Page 77 Ref. No. Part No. Part Name & Description Remarks PCB100 PQWPTC1743BR MAIN P.C.BAORD ASS'Y (RTL) (ICS) IC201 C2HBBG000014 IC202 PQWITC1743BR IC203 C0CBABD00011 IC204 PQVIC62FP33M IC205 PQVIC61CN32N (TRANSISTORS) Q201 PQVTDTC143E TRANSISTOR(SI) Q202 PQVTDTC143E TRANSISTOR(SI) Q203 PQVTDTA143TU TRANSISTOR(SI) Q205 2SD1819A TRANSISTOR(SI) Q206 PQVTDTC143E TRANSISTOR(SI) Q207...
  • Page 78 Ref. No. Part No. Part Name & Description Remarks R205 ERJ3GEYJ271 R206 ERJ3GEYJ271 R207 ERJ3GEYJ271 R209 ERJ3GEYJ102 R210 ERJ3GEYJ103 R211 ERJ3GEYJ103 R212 ERJ3GEYJ101 R213 ERJ3GEYJ101 R217 ERJ3GEYF434 430k R218 ERJ3GEYF824 820k R222 ERJ3GEYJ101 R224 ERJ3GEYJ103 R225 ERJ3GEYJ472 4.7k R228 ERJ3GEYJ224 220k R229 ERJ3GEYJ102...
  • Page 79 Ref. No. Part No. Part Name & Description Remarks C214 ECUV1C104ZFV C215 ECUV1A474KBV 0.47 C217 ECUV1C104ZFV C218 ECUV1C104ZFV C220 ECEV0JA101 C221 ECUV1C104ZFV C222 ECUV1C104ZFV C223 ECST0JY106 C224 ECUV1C104ZFV C225 ECUV1C104ZFV C226 ECUV1C104ZFV C227 ECUV1C104ZFV C228 ECUV1C104ZFV C229 ECUV1A105ZFV C230 ECUV1E333KBV 0.033 C231 ECUV1A224KBV...

  • Page 80: For Schematic Diagram

    PQKE10130Z5 BELT CLIP (for KX-TC1743G) PQKE10130Z2 BELT CLIP (for KX-TC1743W) PQKE10130Z3 BELT CLIP (for KX-TC1743PW) PQKL10035Z1 WALL MOUNT ADAPTOR (for KX-TC1743B) (for KX-TC1743F) (for KX -TC1743G) PQKL10035Z2 WALL MOUNT ADAPTOR (for KX-TC1743W) (for KX-TC1743PW) PQQW12441Z QUICK GUIDE (for English) PQQW12442Z...

  • Page 81: Circuit Board (Handset)

    25.3. Memo 26. SCHEMATIC DIAGRAM (RF Unit) 27. SCHEMATIC DIAGRAM (Base Unit) 28. SCHEMATIC DIAGRAM (Handset) 29. CIRCUIT BOARD (RF Unit) 30. CIRCUIT BOARD (Base Unit) 30.1. Component View 30.2. Flow Solder Side View 31. CIRCUIT BOARD (Handset) 31.1. Component View 31.2.
  • Page 83 IC201 IC202...
  • Page 84 Input 1.1kHz 18mVp-p (-45dBm/600 ) (Headset) (Headset) Input 1.1kHz IC201 -43dBm/600 IC205 3.3V IC203 3.3V IC204 KX-TC1743B/F/G/W/PW: SCHEMATIC DIAGRAM (Handset)
  • Page 85 Input 1.1kHz 18mVp-p (-45dBm/600 ) (Headset) (Headset) Input 1.1kHz IC201 -43dBm/600 IC205 3.3V IC203 3.3V IC204 KX-TC1743B/F/G/W/PW: SCHEMATIC DIAGRAM (Handset)
  • Page 86 IC201 IC202 3 4 5...
  • Page 88 IC202 IC300 IC201...
  • Page 89 Input 1.1kHz 140mVp-p (-25dBm/600 Output Call ID data IC332 IC331 6.0V 3.3V 3.6V IC100 -51dBm/600 1.1kHz 3.2V 9V DC. for H/S SP Phone TX TALK TX SP PhoneRX TALK RX KX-TC1743B/F/G/W/PW: SCHEMATIC DIAGRAM (Base Unit)
  • Page 90 Input 1.1kHz 140mVp-p (-25dBm/600 Output Call ID data IC332 IC331 6.0V 3.3V 3.6V IC100 -51dBm/600 1.1kHz 3.2V 9V DC. for H/S SP Phone TX TALK TX SP PhoneRX TALK RX KX-TC1743B/F/G/W/PW: SCHEMATIC DIAGRAM (Base Unit)
  • Page 91 HANDSET SP- SP+ (COMPONENT VIEW) 10µ MIC- ANT GND IC201 MIC+ 10µ IC202 100Ω TEST PULL UP...
  • Page 92 (COMPONENT VIEW) ANT GND TEST...
  • Page 93 (FLOW SOLDER SIDE VIEW) Line A Line B...
  • Page 94 IC101...
  • Page 95 IC102 IC101...
  • Page 96 Vcc (3.2V) Vcc (3.3V) HS MIP Louto Bell CHARGE-CTL Vcc (3.3V) IC201 X200 3 4 5 LINO X'tal CLK Reset: RST Power-Down: PDN Mic input...

This manual is also suitable for:

Kx-tctc1743fKx-tc1743gKx-tc1743wKx-tc1743pwKx-tc1743f

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