Panasonic KX-TCD420BXM Service Manual
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Panasonic KX-TCD420BXM Service Manual

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www.freeservicemanuals.info
1/2/2015
ORDER NO. KM40308169C8
Telephone Equipment
KX-TCD420BXM / KX-A142EXM / KX-TCD420BXS / KX-
A142EXS
Digital Cordless Answering System
Metalic Gray Version
Silver Version
(for Asia, Eastern Europe and Other areas)
SPECIFICATIONS
1
Digitized in Heiloo, Holland

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Summary of Contents for Panasonic KX-TCD420BXM

  • Page 1 1/2/2015 ORDER NO. KM40308169C8 Telephone Equipment KX-TCD420BXM / KX-A142EXM / KX-TCD420BXS / KX- A142EXS Digital Cordless Answering System Metalic Gray Version Silver Version (for Asia, Eastern Europe and Other areas) SPECIFICATIONS Digitized in Heiloo, Holland...

  • Page 2: Specification

    1/2/2015 2003 Panasonic Communications Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law. 1. ABOUT LEAD FREE SOLDER (PbF: Pb free) Note: In the information below, Pb, the symbol for lead in the periodic table of elements, will refer to standard solder or solder that contains lead.
  • Page 3 www.freeservicemanuals.info 1/2/2015 case of using high temperature soldering iron, please be careful not to heat too long. - PbF solder will tend to splash if it is heated much higher than its melting point, approximately 1100°F (600°C). - If you must use Pb solder on a PCB manufactured using PbF solder, remove as much of the original PbF solder as possible and be sure that any remaining is melted prior to applying the Pb solder.

  • Page 4: For Service Technicians

    www.freeservicemanuals.info 1/2/2015 (Component View) (Flow Solder Side View) Note: The location of the “PbF“ mark is subject to change without notice. 1.2.2. Handset PCB (Component View) (Flow Solder Side View) Note: The location of the “PbF“ mark is subject to change without notice. 1.2.3.

  • Page 5: Battery Charge

    www.freeservicemanuals.info 1/2/2015 - When you replace the batteries, part should be removed first. 4.2. Battery Charge At the time of shipment, the batteries are not charged. To charge, place the handset on the base unit. Please charge the batteries for about 7 hours before initial use. During charging, the battery icon is as shown below.
  • Page 6 www.freeservicemanuals.info 1/2/2015 - Battery life is dependent on use and conditions but in general when using fully charged Ni-MH batteries (700 mAh): Talk time: 10hrs approx. Standby time: 120hrs approx. - When using Ni-Cd batteries (250 mAh): Talk time: 4hrs approx. Standby time: 40hrs approx.

  • Page 7: Location Of Controls

    - Do not use non-rechargeable batteries. If non-rechargeable batteries are fitted and start charging, it may cause the leakage of the battery electrolyte. Please use only Panasonic P03P(Ni-MH) or P03H(Ni-Cd) batteries. Note for Service: When Ni-Cd batteries are fitted with the...
  • Page 8 www.freeservicemanuals.info 1/2/2015 6. SETTINGS 6.1. Connection 6.1.1. Base Unit Plug in the AC adaptor and the telephone line cord in order 1, 2, 3, 4. The AC adaptor must remain connected at all times (It is normal for the adaptor to feel warm during use).

  • Page 9: Pin Code

    www.freeservicemanuals.info 1/2/2015 6.1.2. Charger Unit The AC adaptor must remain connected at all times (It is normal for the adaptor to feel warm during use). 6.2. Symbols Used in This Service Manual 6.3. PIN Code 6.3.1. Base Unit Digitized in Heiloo, Holland...
  • Page 10 www.freeservicemanuals.info 1/2/2015 - To exit the operation, press any time. For Service Hint: * : If the current 4-digit PIN is forgotten, press you will be able to enter new PIN. As for the case that Base Unit and Handset are not linked with, refer to Reset Base Unit PIN to Default (0000) -When There is NO Handset Registered- 6.3.2.
  • Page 11 www.freeservicemanuals.info 1/2/2015 * : If the current 4-digit PIN is forgotten, press you will be able to enter new PIN. 6.3.3. Reset Base Unit PIN to Default (0000) -When There is NO Handset Registered- 6.3.3.1. Symptom There is no way to reset base PIN when there is no handset registered to the base. 6.3.3.2.
  • Page 12 www.freeservicemanuals.info 1/2/2015 adaptor, and remove pins on PCB. Then close the cabinet. The base pin returns to the default (0000) and you can register a handset to the base using the base PIN (0000). 6.4. Reset 6.4.1. Base Unit If the base unit is reset, the Caller ID list will clear. - To exit the operation, press any time.
  • Page 13 www.freeservicemanuals.info 1/2/2015 - To exit the operation, press any time. - *1: The factory preset is 0000. Handset Initial Settings Function Initial Setting Remarks (selectable options) Time Alarm Mode OFF/ON Alarm Time Clear OFF/Once/Daily Handset Ringer Volume Handset External Ringer Pattern 20 patterns Handset Internal Ringer Pattern 20 patterns...

  • Page 14: Key Lock

    www.freeservicemanuals.info 1/2/2015 6.5. Key Lock You can lock the handset dialling buttons. Only incoming calls are accepted while the key lock is on. The key lock is cancelled if the handset is turned off. When the key lock is on, emergency calls cannot be made until key lock is cancelled. is displayed (Refer to Handset Display ()) and all dialling buttons...

  • Page 15: Call Restriction

    www.freeservicemanuals.info 1/2/2015 is displayed (Refer to Handset Display ()) on the LCD. 6.8. Call Restriction You can restrict selected handset(s) from dialling selected phone numbers. You can assign up to 10 call restriction numbers (up to 8 digits). If you dial a restricted number, the call does not connect and restricted number flashes.
  • Page 16 www.freeservicemanuals.info 1/2/2015 - To exit the operation, press any time. - *1: The factory preset is 0000. - *2: The selected handset(s) will stop flashing. 6.10. Call BAR On/Off (Call Prohibition On/Off) You cannot make any dialling if Call BAR is on. When call BAR is on, emergency calls cannot be made until Call BAR is cancelled.
  • Page 17 6.13. Selecting Flash/Earth Mode An earth relay can be installed as an option depending on your PBX requirements. Please consult your nearest Panasonic Service Centre for installation. On installation, you can select flash or earth mode to suit your PBX or Network provider.
  • Page 18 www.freeservicemanuals.info 1/2/2015 - To exit the operation, press any time. - The factory preset is in shade. - *1: The factory preset is 0000. 6.14. Summary of Programmable Functions You can select and execute the following functions by pressing direct command as follows without programming.

  • Page 19: Handset Display

    www.freeservicemanuals.info 1/2/2015 *1 If any key is not pressed over 60 seconds, the display will return to “Setting Base”. *2 Refer to PIN Code () for more details. 7. DISPLAY 7.1. Handset Display For Service Hint: Digitized in Heiloo, Holland...
  • Page 20 www.freeservicemanuals.info 1/2/2015 icon will be displayed if the unit took a signal from Telephone Company as a Voice Message signal. In that case, press the right button of the Navigator Key for a while. 7.2. Before Requesting Help (Troubleshooting) If you experience any problems with the normal use of your apparatus, you should unplug it from the telephone outlet and connect a known working telephone in its place.
  • Page 21 www.freeservicemanuals.info 1/2/2015 Digitized in Heiloo, Holland...

  • Page 22: Making A Call

    www.freeservicemanuals.info 1/2/2015 Cross Reference: Power On/Off Call BAR On/Off (Call Prohibition On/Off) Key Lock PIN Code 8. OPERATIONS 8.1. Power On/Off *1 When button is released, the display changes to the standby mode. *2 The display goes blank. 8.2. Making a Call *1 If you need correction, press CLEAR.
  • Page 23 www.freeservicemanuals.info 1/2/2015 After a mains power failure the clock needs to be reset. Ensure that icon is not flashing. - To exit the operation, press any time. *1 For example, to set 7:15, enter 0715. *2 For example, to set the 16th of February, 2003, enter 160203. 8.5.
  • Page 24 www.freeservicemanuals.info 1/2/2015 character. To enter characters, see Character Selection below. *2 To continue storing another caller information, repeat the steps from 3. Digitized in Heiloo, Holland...
  • Page 25 www.freeservicemanuals.info 1/2/2015 - To exit the operation, press any time. *1 If there is no item stored in the phonebook, the display shows *2 Digits are cleared to the left of the flashing digit. *3 Digits are added to the left of the flashing digit. If you need to clear or add more than one digit, repeat the steps from 4.
  • Page 26 www.freeservicemanuals.info 1/2/2015 - To exit the operation, press any time. *1 If there is no item stored in the redial/caller list, the display shows *2 If you need correction, press RIGHT or LEFT to move cursor then clear a character by pressing CLEAR, and/or enter digits.
  • Page 27 www.freeservicemanuals.info 1/2/2015 9. DISASSEMBLY INSTRUCTIONS 9.1. Base Unit Shown in Fig.- To Remove Remove Lower Cabinet Screws (2.6 × 12)..(A) × 2 Main P.C. Board Main P.C. Board 9.2. Handset Digitized in Heiloo, Holland...
  • Page 28 www.freeservicemanuals.info 1/2/2015 Shown in Fig.- To Remove Remove Rear Cabinet Screws (2 × 10)..(B) × 2 Rear Cabinet Follow the procedure. Main P.C. Board Screw (2 × 8)....(C) × 1 Screws (2 × 8).....(D) × 2 Main P.C. Board 9.3. Charger Unit Digitized in Heiloo, Holland...
  • Page 29 www.freeservicemanuals.info 1/2/2015 Shown in Fig.- To Remove Remove Lower Cabinet Screws (2.6 × 14)..(E) × 2 Main P.C. Board Main P.C. Board 10. ASSEMBLY INSTRUCTIONS 10.1. Warning When Constructing the Base Unit 11. TROUBLESHOOTING GUIDE Flow Chart Digitized in Heiloo, Holland...

  • Page 30: Check Power

    www.freeservicemanuals.info 1/2/2015 Cross Reference: Check Power Bell Reception Check Battery Charge Check Link Check Handset Transmission Check Handset Reception SIGNAL ROUTE TAM Voice Prompt Problems 11.1. Check Power 11.1.1. Base Unit Is the AC Adaptor inserted into AC outlet? (Check AC Adaptor’s specification.) Digitized in Heiloo, Holland...
  • Page 31 www.freeservicemanuals.info 1/2/2015 Cross Reference Power Supply Circuit Note: BBIC is IC8. 11.1.2. Handset Cross Reference Power Supply Circuit/Reset Circuit Note: BBIC is IC1. 11.2. Check Battery Charge 11.2.1. Base Unit Cross Reference: Charge Circuit Digitized in Heiloo, Holland...

  • Page 32: Check Link

    www.freeservicemanuals.info 1/2/2015 11.2.2. Handset Cross Reference: Check Power Charge Circuit Note: BBIC is IC1. 11.2.3. Charger Unit Cross Reference: Power Supply Circuit 11.3. Check Link 11.3.1. Base Unit Digitized in Heiloo, Holland...
  • Page 33 www.freeservicemanuals.info 1/2/2015 Cross Reference: Power Supply Circuit Adjustment (Base Unit) 11.3.2. Handset Cross Reference Power Supply Circuit Digitized in Heiloo, Holland...

  • Page 34: Check Handset Transmission

    www.freeservicemanuals.info 1/2/2015 Adjustment 11.4. Check Handset Transmission Cross Reference: SIGNAL ROUTE 11.5. Check Handset Reception Cross Reference: HOW TO CHECK THE HANDSET SPEAKER SIGNAL ROUTE 11.6. Check Caller ID Cross Reference: SIGNAL ROUTE 11.7. TAM Voice Prompt Problems Digitized in Heiloo, Holland...
  • Page 35 www.freeservicemanuals.info 1/2/2015 Cross Reference: Check Link Check Handset Reception EEPROM LAYOUT (BASE UNIT) TAM Voice Prompt Download 11.8. Bell Reception 11.8.1. Base Unit Note: BBIC is IC8. 11.8.2. Handset Cross Reference: Digitized in Heiloo, Holland...
  • Page 36 www.freeservicemanuals.info 1/2/2015 Telephone Line Interface Check Link Note: BBIC is IC1. 12. CHECK PROCEDURE (BASE UNIT) 12.1. Preparation 12.1.1. Equipment Required - DECT tester: Rohde & Schwarz, CMD 60 is recommended. - Frequency counter: it must be precise to be able to measure 1Hz (precision;...
  • Page 37 www.freeservicemanuals.info 1/2/2015 12.2.2. PC Setting 1. Open a window of MS-DOS mode from the start-up menu. 2. Change a directory to the one with “RTX_COM” contained. 3. Type “SET RTX_COM=1” from the keyboard (when COM port 1 is used for the connection). 4.
  • Page 38 www.freeservicemanuals.info 1/2/2015 13.1.1. Equipment Required - DECT tester: Rohde & Schwarz, CMD 60 is recommended. - Frequency counter: it must be precise to be able to measure 1Hz (precision; ±4ppm). Hewlett Packard, 53131A is recommended. - DC power: it must be able to output at least 1A current under 2.4V for Handset, 9V for JIG.
  • Page 39 www.freeservicemanuals.info 1/2/2015 Note: See the table below for frequently used commands. Command name Function Example rdeeprom Read the data of EEPROM Type “rdeeprom 00 00 FF”, and the data from address “00 00” to “FF” is read out. readid Read ID (RFPI) Type “readid”, and the registered ID is read out.
  • Page 40 www.freeservicemanuals.info 1/2/2015 Items Procedure Check Adjustment Replace Point Parts 1. Confirm that the voltage between J101 and GND is 2.65V ± 0.2V. 2.65V Supply C40,C41,C4 Confirmation C43,C44,IC C32,C33,C3 C37,C39 1. Confirm that the voltage between TP11 and GND is 4.0V ± 0.2V. 4.0V Supply D4,C36,IC2 Confirmation...
  • Page 41 www.freeservicemanuals.info 1/2/2015 Items Procedure Check Adjustment Replace Point Parts Hookswitch 1. Connect J2 (Telephone Socket) to Tel-simulator which is connected with 600 IC8,R12,R1 2. Set line voltage to 48V at on hook condition and line current to 40mA. Check with DC 3.
  • Page 42 www.freeservicemanuals.info 1/2/2015 Items Procedure Check Adjustment Replace Point Parts (I) Modulatoin Check Follow steps 1 to 3 of (H) above. IC6,IC4,L2, and Adjustment C57,C61,C7 4. Confirm that the B-Field Modulation is 340kHz/div ~ 402kHz/ div using data type Fig31. C77,C78,C7 5.
  • Page 43 www.freeservicemanuals.info 1/2/2015 Items Procedure Check Adjustment Replace Point Parts Timing Follow steps 1 to 3 of (H) above. IC6,IC4,L2, Confirmation C57,C61,C7 4. Confirm that the Timing accuracy is < ± 5.0ppm. C77,C78,C7 C68,C69,R7 R80,C63,C6 R83,R84,C6 L3,C79,C67 C66,D10,C6 RSSI Level Follow steps 1 to 3 of (H) above. IC6,IC4,L2, Confirmation C57,C61,C7...
  • Page 44 www.freeservicemanuals.info 1/2/2015 Items Procedure Check Adjustment Replace Point Parts 1. Configure the DECT tester (CMD60) as follows; Receive Audio IC6,IC4,L2, <Setting> Check and C57,C61,C7 Adjustment -Test mode: FP -Mode: Normal C77,C78,C7 -PMID: 0000 2. Execute the command "testmode". 3. Initiate connection from DECT tester. C68,C69,R7 4.
  • Page 45 www.freeservicemanuals.info 1/2/2015 Items Procedure Check Adjustment Replace Point Parts 1. Configure the DECT tester (CMD60) as follows; Transmit Audio IC6,IC4,L2, <Setting> Check and C57,C61,C7 Adjustment -Test mode: FP -Mode: Normal C77,C78,C7 -PMID: 0000 2. Execute the command "testmode". 3. Initiate connection from DECT tester. C68,C69,R7 4.
  • Page 46 www.freeservicemanuals.info 1/2/2015 14.2.1. Component View Note: (H) - (O) is refered to ADJUSTMENTS (BASE UNIT AND CHARGER UNIT) 14.2.2. Flow Solder Side View Note: (A) - (P) is refered to ADJUSTMENTS (BASE UNIT AND CHARGER UNIT) 14.3. Adjustment (Charger Unit) Items Procedure Check...
  • Page 47 www.freeservicemanuals.info 1/2/2015 Symptom Remedy* The movement of Battery Low indicator is wrong. Make confirmation in item (A)~(C (F)~(G) The handset does not respond to a call from base unit. Make adjustments in item (A)~(C (H), (J)~(N) The handset does not transmit or the transmit frequency is off. Make adjustments in item (A)~(C (H)~(K), (M) The transmit frequency is off.
  • Page 48 www.freeservicemanuals.info 1/2/2015 Items Procedure Check Adjustment Replace Point Parts 1. Confirm that the voltage between TP18 and GND is 0V ± 0.4V. VBACK Status IC1,F1,R21 Confirmation R4,C33,L2 D1,C15,C2 C14,Q1,R3 R2,D2,R22 C26,R16,X1 C16,C17 1. BBIC Confirmation (Execute the command "getchk"). BBIC IC1,X1,C16 2.
  • Page 49 www.freeservicemanuals.info 1/2/2015 Items Procedure Check Adjustment Replace Point Parts 1. Apply 2.3V ± 0.005V between TP3(+) and TP4(-). Battery Monitor IC1,D4,L4, 2. Execute the command "readbatt". Confirmation L5,Q2,Q3, 3. Confirm: 98 < returned value < A8 (Hex) R6,D2,R22 4. Execute the command "WRTBAT2 XX". XX: (returned value) - 06 (Hex) C26,F1,R21 R4,C33...
  • Page 50 www.freeservicemanuals.info 1/2/2015 Items Procedure Check Adjustment Replace Point Parts (J) Modulatoin Check TP15 Follow steps 1 to 4 of (I) above. IC1,IC3,C54 and Adjusment 5. Confirm that the B-Field Modulation is 340kHz/div ~ 402kHz/ C66,C60,L3 div using data type Fig31. 6.
  • Page 51 www.freeservicemanuals.info 1/2/2015 Items Procedure Check Adjustment Replace Point Parts Timing Follow steps 1 to 4 of (I) above. IC1,IC3,C54 Confirmation 5. Confirm that the Timing accuracy is < ± 10ppm. C66,C60,L3 C57,C55,C5 C62,R23,R2 C63,C64,C6 RSSI Level Follow steps 1 to 4 of (I) above. IC1,IC3,C54 Confirmation 5.
  • Page 52 www.freeservicemanuals.info 1/2/2015 Items Procedure Check Adjustment Replace Point Parts 1. Configure the DECT tester (CMD60) as follows; Transmit Audio TP15 IC1,C8,R7, <Setting> Check and R8,C6,C7, Confirmation -Test mode: FP C5,R5,R1, -Mode: Normal C4,IC3,C54 -RFPI: 0102030405 2. Execute the command "testmode". 3.
  • Page 53 www.freeservicemanuals.info 1/2/2015 * : Refer to Adjustment (Base Unit) 16.2. Handset Item Value Refer to -. ** Remarks TX Power More than 20 dBm ~ 25 Adjustment (Base Unit) Modulation 340 kHz/div ~ 402 kHz/div Data type: Fig31 Adjustment (Base Unit) Frequency Offset -50 kHz ~ +50 kHz Adjustment (Base Unit)
  • Page 54 www.freeservicemanuals.info 1/2/2015 18. FREQUENCY TABLE (MHz) Digitized in Heiloo, Holland...
  • Page 55 www.freeservicemanuals.info 1/2/2015 BASE UNIT HANDSET Receive Frequency Channel No Transmit Frequency Transmit Frequency Receive Frequency 1897.344 1897.344 1897.344 1897.344 1895.616 1895.616 1895.616 1895.616 1893.888 1893.888 1893.888 1893.888 1892.160 1892.160 1892.160 1892.160 1890.432 1890.432 1890.432 1890.432 1888.704 1888.704 1888.704 1888.704 1886.976 1886.976 1886.976 1886.976...
  • Page 56 www.freeservicemanuals.info 1/2/2015 - Detector - Compress/Expander - First/Second Mixer - Amplifier for transmission and reception - EEPROM: IC4 - Temporary operating parameters (for RF, etc.) Note: Refer to EEPROM LAYOUT (BASE UNIT) - Flash PROM: IC7 - 2M bit - Operational Firmware for CPU - Serial Flash ROM: IC6 - 4M bit - Audio data for TAM operation...
  • Page 57 www.freeservicemanuals.info 1/2/2015 20.3. Telephone Line Interface <Function> - Bell signal detection - Clip signal detection - ON/OFF hook circuit - Audio circuits Bell & Clip (: Calling Line Identification Presentation: Caller ID) signal detection: In the standby mode, Q2 is open to cut the DC loop current and decrease the ring load. When ring voltage appears at the TP3 (A) and TP40 (B) leads (when the telephone rings), the signal is transferred as follows;...
  • Page 58 www.freeservicemanuals.info 1/2/2015 In the standby mode, Q2 is open, and connected as to cut the DC loop current and to cut the voice signal. The unit is consequently in an off-hook condition. When IC8 detects a ring signal or press the TALK Key onto the handset, Q4 turns on and then Q2 turns on, thus providing an off-hook condition (active DC current flow through the circuit) and the following signal flow is for the loop current.
  • Page 59 www.freeservicemanuals.info 1/2/2015 21. BLOCK DIAGRAM (HANDSET) 22. CIRCUIT OPERATION (HANDSET) 22.1. Outline Handset consists of the following ICs as shown in BLOCK DIAGRAM (HANDSET) - 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 Module: IC3...
  • Page 60 www.freeservicemanuals.info 1/2/2015 - When charging the handset on the Charger Unit, the charge current is as follows; DC+(5.5V ~ 6V) R1, R2 CHARGE+(Charger Unit) CHARGE+(Handset) BATTERY+ ... Battery ... BATTERY- CHARGE-(Handset) CHARGE-(Charger Unit) DC-(GND) In this way, the BBIC on Handset detects the fact that the battery is charged. The charge current is controlled by switching Q2 of Handset.

  • Page 61: Signal Route

    www.freeservicemanuals.info 1/2/2015 24. SIGNAL ROUTE 25. CPU DATA (BASE UNIT) 25.1. IC8 (BBIC) Digitized in Heiloo, Holland...
  • Page 62 www.freeservicemanuals.info 1/2/2015 Descriptiojn Hi-z Remarks for Down Load for Down Load for Down Load SYRI Active Active VSSO XTAL X'tal LOAD X'tal VDDREG RXDSG Active Active VDDTXDA TXDA Active Active (NO USE) DAON PA-ON PA-OFF SYCL Active Active SYEN Normal Latch SYDA Active...
  • Page 63 www.freeservicemanuals.info 1/2/2015 Descriptiojn Hi-z Remarks for Flash Memory for Flash Memory for Flash Memory for Flash Memory for Flash Memory DO/I for Flash Memory DO/I for Flash Memory DO/I for Flash Memory DO/I for Flash Memory DO/I for Flash Memory DO/I for Flash Memory DO/I...
  • Page 64 www.freeservicemanuals.info 1/2/2015 Descriptiojn Hi-z Remarks (NO USE) (NO USE) (NO USE) (NO USE) DO/I for Voice Down Load (NO USE) DO/I for Voice Down Load DO/I for Voice Down Load DO/I for Voice Down Load DO/I for Voice Down Load FRDY for Flash Memory for Flash Memory...
  • Page 65 www.freeservicemanuals.info 1/2/2015 Descriptiojn Hi-z Remarks VDDA MFBN MFBP ADREFP ADREFN RSSI MPCINP RESETQ Normal Reset Note: I_PU; Internal Pull-Up, I_PD; Internal Pull-Down 26. CPU DATA (HANDSET) 26.1. IC1 (BBIC) Description Hi-z Remarks LCD_SEGMENT Active LCD_COMMON Active LCD_COMMON Active LCD_COMMON Active LCD_COMMON Active LCD_COMMON...
  • Page 66 www.freeservicemanuals.info 1/2/2015 Description Hi-z Remarks Reference clock Active POWER_SW No Key CHARGE_DET Charge DCDCDRV Active DCDCCMR RESET Normal VSSO LOAD XTAL VDDPM VDDLO VDDBAT VDDLR CHARGE_START for charge VDDA VSSA LSRN LSRP BANDGAP_REF MICS MICP MICN Reference Voltage RSSI P0.4 AD4N AD4P (NO USE)
  • Page 67 www.freeservicemanuals.info 1/2/2015 Description Hi-z Remarks I2CLK D.I/O Active MODE (NO USE) VBACK/P0.7 LCD_SEGMENT Active LCD_SEGMENT Active LCD_SEGMENT Active LCD_SEGMENT Active LCD_SEGMENT Active VDDLI LCD_SEGMENT Active LCD_SEGMENT Active LCD_SEGMENT Active LCD_SEGMENT Active LCD_SEGMENT Active LCD_SEGMENT Active LCD_SEGMENT Active LCD_SEGMENT Active (NO USE) Power Select Low Power LCD_SEGMENT...
  • Page 68 www.freeservicemanuals.info 1/2/2015 27.2. Introduction The base unit uses a 32K bit serial EEPROM (IC4) for storing volatile parameters. All parameters are set up before the base leaves the factory. Some of these are vital for the operation of the hardware so a set of default parameters is programmed before the actual hardware fine-tuning can be initiated.
  • Page 69 www.freeservicemanuals.info 1/2/2015 Address Default Name Type Description Country Setting 0044-0048 FF .. FF IPUI_5 (ID for H/S 5) Ipui for handset 5. If set to FF .. FF (5bytes) the handset is not enrolled. 0049-004D FF .. FF IPUI_6 (ID for H/S 6) Ipui for handset 6.
  • Page 70 www.freeservicemanuals.info 1/2/2015 Address Default Name Type Description Country Setting 0F0B CalibBreakTime[0] Calibrated loop-break time for short break Unit: 10 ms, defaultst to 80 ms 0F0C CalibBreakTime[1] Calibrated loop-break time for short break Unit: 10 ms, defaultst to 200 ms 0F0D CalibBreakTime[2] Calibrated loop-break time for short break...
  • Page 71 www.freeservicemanuals.info 1/2/2015 Address Default Name Type Description Country Setting 0F37..38 3D 01 Parse.Configuration 3D 08 Clip parse set configuration 0: Etsi: 1=enable 0=disable 1: ForwardNumber: 1=enable 0=disable 2: Danish: 1=enable 0=disable 3: Dutch: 1=enable 0=disable 4: Canadian: 1=enable 0=disable 5: Swedish: 1=enable 0=disable 6: UserDefined: 1=enable 0=disable 7: KPN vmwi: 1=enable 0=disable 8: ProtocolPriority:...
  • Page 72 www.freeservicemanuals.info 1/2/2015 Address Default Name Type Description Country Setting 0F40 CountryCode Country code 0: Germany 1: Greece 2: Turkey 3: England 4: Switzerland 5: Poland 7: France 8: Denmark A: Italy C: Czech E: Hungary F: Spain 13: South Africa 14: Russia 0F41-0F60 TamTagInfo...
  • Page 73 www.freeservicemanuals.info 1/2/2015 Address Default Name Type Description Country Setting 0F61 TamPrgRings TAM Current Setting data 0: Answer ON/OFF 0:OFF/1:ON 1: ICM Record Time Mode1 0:OFF/1: Greeting Only 2: ICM Record Time Mode2 0:OFF/1: Unlimited Mode1=0&Mode2=0:ICM Record Time 1min 3: CPC time selection 0:time A/1:time 4: Greeting Monitor mode ON/OFF 0:OFF 1:ON 5: Reserve...
  • Page 74 www.freeservicemanuals.info 1/2/2015 Address Default Name Type Description Country Setting 0F66 DetData Detection data 0: Selection CPC A/B 0:OFF (A fixed)/ ON(Select) 1: Reserve 2: Detect 1st Short Bell (300ms) for coun 3: Cyclic Detection of VOX 0: OFF/1: ON(Detect) 4: Detection of DSC 0: OFF/1: ON(Detect) 5: Reserve 6: Reserve 7: Reserve...
  • Page 75 www.freeservicemanuals.info 1/2/2015 Address Default Name Type Description Country Setting 0F6A TamRingsDefNum Number of rings default data 0: Default is Automatically Turn on for Toll saver 2-7: Default of the number of rings for Turn on. 27.3.6. BsUiTask settings Address Default Name Type Description...
  • Page 76 www.freeservicemanuals.info 1/2/2015 28.2. Introduction The handset uses a 32k bit serial EEPROM (IC2) for storing volatile parameters. All parameters are set up before the handset the factory. Some of these are vital for the operation of the hardware so a set of default parameters is programmed before the actual hardware fine-tuning can be initiated.
  • Page 77 www.freeservicemanuals.info 1/2/2015 Address Default Name Type Description Country Setting 0100-0104 RFPI_1 (Base 1) RFPI for registration 1 0105 SerClass_1 Service class for registration 1 0106 LAL_1 Location area level for registration 1 0107 IPUI_LEN_1 IPUI length for registration 1 0108-0114 IPUI_1 IPUI for registration 1 0115...
  • Page 78 www.freeservicemanuals.info 1/2/2015 Address Default Name Type Description Country Setting 0462 Language 00 = English 01 = Spanish 02 = French 03 = Italian 04 = Dutch 05 = Turkish 06 = Hungarian 07 = Portuguese 08 = Polish 09 = Command 0A = German 0467 FactoryLanguageSetting x...
  • Page 79 www.freeservicemanuals.info 1/2/2015 Address Default Name Type Description 0F04 LowVoltage Voltage on which to start battery low- indication. The voltage has to be measured under this value for 8 seconds before the handset start signaling low battery. LowVoltage[eeprom]=[ADC-steps]= LowVoltage[mV](14.35[mV/step]) 28.3.4. Default Audio-Parameters Address Default Name...
  • Page 80 www.freeservicemanuals.info 1/2/2015 Address Default Name Type Description Country Setting 0F53 Menu Config bit 0 - Registration menu on/off 1/0 bit 1 - Select base menu on/off 1/0 bit 2 - Internal ringer menu on/off 1/0 bit 3 - Page ringer menu on/off 1/0 bit 4 - Standby mode menu on/off 1/0 bit 5 - Battery select menu on/off 1/0 bit 6 - Call wating menu on/off 1/0...
  • Page 81 www.freeservicemanuals.info 1/2/2015 2. Apply flux to all of the pins on the IC. 3. Being careful to not unsolder the tack points, slide the soldering iron along the tips of the pins while feeding enough solder to the tip so that it flows under the pins as they are heated. 29.3.
  • Page 82 www.freeservicemanuals.info 1/2/2015 Digitized in Heiloo, Holland...
  • Page 83 www.freeservicemanuals.info 1/2/2015 31. CABINET AND ELECTRICAL PARTS LOCATION (HANDSET) 32. CABINET AND ELECTRICAL PARTS LOCATION (CHARGER UNIT) Digitized in Heiloo, Holland...
  • Page 84 www.freeservicemanuals.info 1/2/2015 33. ACCESSORIES AND PACKING MATERIALS Digitized in Heiloo, Holland...
  • Page 85 1/2/2015 33.1. KX-TCD420BXM/BXS 33.2. KX-A142EXM/EXS Digitized in Heiloo, Holland...
  • Page 86 www.freeservicemanuals.info 1/2/2015 34. TERMINAL GUIDE OF THE ICs, TRANSISTORS AND DIODES 34.1. Base Unit Digitized in Heiloo, Holland...

  • Page 87: Replacement Parts List

    www.freeservicemanuals.info 1/2/2015 34.2. Handset 34.3. Charger Unit 35. REPLACEMENT PARTS LIST Note: 1. RTL (Retention Time Limited) Note: 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 88 www.freeservicemanuals.info 1/2/2015 this period, the assembly will no longer be available. 2. Important safety notice Components identified by the mark indicates special characteristics important for safety. When replacing any of these components, only use specified manufacture’s parts. 3. The S mark means the part is one of some identical parts. For that reason, it may be different from the installed part.
  • Page 89 Part No. Part Name & Description Remarks PQGG10154V5 GRILLE (for KX-TCD420BXM) ABS-HB PQGG10154V4 GRILLE (for KX-TCD420BXS) ABS-HB PQKM10586Z4 CABINET BODY (for KX-TCD420BXM) ABS-HB PQKM10586Z3 CABINET BODY (for KX-TCD420BXS) ABS-HB PQHR10962Z OPTIC CONDUCTIVE PARTS LED LENS PQJT10203Z TERMINAL PQKE10356Z1 GUIDE CHARGE TERMINAL CASE POM-HB...
  • Page 90 www.freeservicemanuals.info 1/2/2015 Ref. No. Part No. Part Name & Description Remarks PQVDBZV55C02 DIODE(SI) LED8 LNJ308G8JRA (COILS) PQLQR4D4R7K COIL PQLQR2M33NK COIL (JACKS) PQJJ1B4Y JACK PQJJ1TB26Z JACK (RESISTORS) PQ4R18XJ472 4.7K ERJ3GEYJ103 ERJ3GEYJ184 180K ERJ3GEYJ104 100K PQ4R10XJ562 5.6K ERJ3GEYJ103 ERJ3GEYJ222 2.2K PQ4R18XJ000 ERJ3GEYJ333 ERJ3GEYJ562 5.6K ERJ12YJ220...
  • Page 91 www.freeservicemanuals.info 1/2/2015 Ref. No. Part No. Part Name & Description Remarks ERJ1WYJ330 ERJ3GEYJ101 ERJ3GEYJ221 ERJ3GEYJ103 ERJ3GEYJ103 ERJ3GEYJ103 ERJ3GEYJ103 ERJ3GEYJ222 2.2K ERJ3GEYJ472 4.7K ERJ3GEYJ103 ERJ3GEYJ102 ERJ3GEYJ102 ERJ3GEYJ102 ERJ3GEYJ101 ERJ3GEYJ103 ERJ3GEYJ103 ERJ3GEYJ102 ERJ3GEYJ154 150K ERJ3GEYJ390 ERJ3GEYJ390 ERJ3GEYJ330 ERJ3GEYJ181 ERJ3GEYJ181 ERJ3GEYJ681 ERJ3GEYJ155 1.5M PQ4R10XJ562 5.6K ERJ3GEYJ472...
  • Page 92 www.freeservicemanuals.info 1/2/2015 Ref. No. Part No. Part Name & Description Remarks ECUV1H100DCV 10P ECUV1H100DCV 10P ECEA1CK101 ECEA0JKA331 ECEA0JKA331 ECUV1A105ZFV ECUV1C104KBV 0.1 ECUV1A105ZFV ECUV1C104KBV 0.1 ECUV1A105ZFV ECUV1H153KBV 0.015 ECUV1C823KBV 0.082 ECUV1C104KBV 0.1 ECUV1H333KBV 0.033 ECUV1C105ZFV ECUV1C105ZFV ECUV1C105ZFV ECUV1C823KBV 0.082 ECUV1H060DCV 6P ECUV1H270JCV ECUV1H100DCV 10P ECUV1H100DCV 10P...
  • Page 93 www.freeservicemanuals.info 1/2/2015 Ref. No. Part No. Part Name & Description Remarks H0D103500003 CRYSTAL OSCILLATOR 35.2. Handset 35.2.1. Cabinet and Electrical Parts Ref. No. Part No. Part Name & Description Remarks PQGP10225Z4 PANEL, LCD (for KX-A142EXM) AS-HB PQGP10225Y3 PANEL, LCD (for KX-A142EXS) AS-HB PQKM10587V5 CABINET BODY (for KX-A142EXM)
  • Page 94 1/2/2015 Ref. No. Part No. Part Name & Description Remarks PCB100 PQWP1D420BXR MAIN P.C.BOARD ASS'Y (RTL) (for KX-TCD420BXM) (for KX- TCD420BXS) PCB100 PQWP1D142EXR MAIN P.C.BOARD ASS'Y (RTL) (for KX-A142EXM) (for KX-A142EXS) (ICs) C2HBAK000005 PQWI1D420BXR IC (for KX-TCD420BXM) (for KX-TCD420BXS) (*2)
  • Page 95 www.freeservicemanuals.info 1/2/2015 Ref. No. Part No. Part Name & Description Remarks ECUV1H1R0CCV ECUV1H180JCV ECUV1C104KBV ECUV1C104KBV ECUV1C104KBV ECUV1C104KBV ECUV1C104KBV ECUV1C104KBV ECUV1C104KBV ECUV1C104KBV ECUV1C104KBV ECUV1C104KBV ECUV1C104KBV ECUV1H100DCV ECUV1A225KB ECUV1H100DCV ECUV1H020CCV ECUV1H020CCV ECUV1H330JCV ECUV1A475KB ECUV1A105KBV ECUV1H100DCV ECUV1A105KBV ECUV1H020CCV ECUV1H020CCV (OTHERS) E101 L0CBAB000052 MICROPHONE J3FKK0000003 RF UNIT H0D103500002...
  • Page 96 www.freeservicemanuals.info 1/2/2015 Ref. No. Part No. Part Name & Description Remarks PCB200 PQWPA142ESCH MAIN P.C.BOARD ASS'Y (RTL) (DIODE) B0JAME000085 DIODE(SI) (JACK) PQJJ1B4Y JACK (RESISTORS) ERJ1WYJ220 ERJ1WYJ270 35.4. Accessories and Packing Materials 35.4.1. KX-TC420BXM/BXS Ref. No. Part No. Part Name & Description Remarks PQLV19CEZ AC ADAPTOR...
  • Page 97 www.freeservicemanuals.info 1/2/2015 37. SCHEMATIC DIAGRAM (HANDSET) 38. SCHEMATIC DIAGRAM (CHARGER UNIT) 39. CIRCUIT BOARD (BASE UNIT) 39.1. Component View 39.2. Flow Solder Side View 40. CIRCUIT BOARD (HANDSET) 40.1. Component View 40.2. Flow Solder Side View 41. CIRCUIT BOARD (CHARGER UNIT) 41.1.
  • Page 98 Marked www.freeservicemanuals.info 1/2/2015 Digitized in Heiloo, Holland...
  • Page 99 www.freeservicemanuals.info 1/2/2015 Digitized in Heiloo, Holland CIRCUIT BOARD (CHARGER UNIT) Component View...
  • Page 100 www.freeservicemanuals.info 1/2/2015 TALK REDIAL BOOK LEFT DOWN RIGHT PROG POWER Digitized in Heiloo, Holland KX-A142EXM/EXS CIRCUIT BOARD (HANDSET) Flow Solder Side View...

  • Page 101: Table Of Contents

    www.freeservicemanuals.info 1/2/2015 TP12 TP14 RF Clock (BBIC: 27) (2.65V) (TP3) (4V) (BBIC: 23 10.368 MHz) TP16 TP12 TP13 TP17 TP14 TP19 TP18 TP10 TP2: SP+ TP1: SP- (BBIC: 41) (BBIC: 42) Digitized in Heiloo, Holland KX-A142EXM/EXS CIRCUIT BOARD (HANDSET) Component View...
  • Page 102 CHARGE+ www.freeservicemanuals.info 1/2/2015 J104 J101 J103 J102 J105 Digital CHARGE TP13 CHARGE Volt Meter TP15 TP11 TP106 TP10 IC2 Input IC2 Output RF Clock (5.5V) (10.368MHZ) (4.0V) Digitized in Heiloo, Holland KX-TCD420BXM/BXS CIRCUIT BOARD (BASE UNIT) Flow Solder Side View...
  • Page 103 34 33 32 31 30 29 JMP8 JMP9 JMP7 SCLK 11 12 1314 15 16 17 JMP51 JMP52 JMP53 JMP50 BELL RESET BELL LED (BBIC:7 (BBIC: 81) (BBIC: 143) (BBIC: 76) 10.368 MHz) Digitized in Heiloo, Holland KX-TCD420BXM/BXS CIRCUIT BOARD (BASE UNIT) Component View...
  • Page 104 www.freeservicemanuals.info 1/2/2015 DC_PLUG Charge_plus Charge_minus pinL Digitized in Heiloo, Holland SCHEMATIC DIAGRAM (CHARGER UNIT)
  • Page 105 www.freeservicemanuals.info 1/2/2015 TP11 K0.1 R5 330 C4 K0.1 R7 330 R1 2.2K K0.1 K0.1 (24) K0.1 R17 0 K0.1 1 SP+ 2 SP- R20 0 TP16 TP17 (25) (26) ’POWER’ (27) (28) (29) A201 TP15 R24 0 VCC_PA (30) TXDA 5 RSSI PAON R18 33...
  • Page 106 Frequency 324KHz www.freeservicemanuals.info 1/2/2015 4.3V 4.1V DC TP14 47uH 2.4V BATTERY+ BATTERY- 3.3K 2.65V 10uH CHARGE+ CHARGE- 10uH ’BATT’ K0.1 TP12 ’SDA’ K0.1 ’SCL’ ’VBACK’ TP18 ’GND’ TP10 PL.13 81 PL.13 P0.5(AD4N) PL.14 51:P0.6(AD4P) 82 PL.14 P0.4(ADBAT) PL.15 83 PL.15 ADRSSI PL.16 84 PL.16...
  • Page 107 www.freeservicemanuals.info 1/2/2015 TP11 K0.1 R5 330 C4 K0.1 R7 330 R1 2.2K K0.1 K0.1 (24) K0.1 R17 0 K0.1 1 SP+ 2 SP- R20 0 TP16 TP17 (25) (26) ’POWER’ (27) (28) (29) A201 TP15 R24 0 VCC_PA (30) TXDA 5 RSSI PAON R18 33...
  • Page 108 10 SYEN D10P (15) 11 GND RXDSG SYRI RXDA (20) +2.8V L2 4.7u DRON RX-DATA TP15 +2.8V FREQ 10.368MHz 10.368MHz burst 428 s 406 s peak 0R00 +3.1V : No Components Digitized in Heiloo, Holland KX-TCD420BXM/BXS SCHEMATIC DIAGRAM (BASE UNIT)
  • Page 109 +60V:DC ON-HOOK www.freeservicemanuals.info 1/2/2015 +10V:DC OFF-HOOK ON-HOOK: 0V LINE VOLTAGE 60V DC OFF-HOOK: about DC 9.8V JMP1 100K JMP9 JMP2 JMP3 2.2K JMP4 0V: ON-HOOK +0.7V DC: OFF-HOOK OPTION4 RLY1 CLIP_STATE +2.8V K0.1 500V1000P 680K K0.1 +2.8V 500V1000P 680K 120K J150P EARTH +4.0V DC...
  • Page 110 10 SYEN D10P (15) 11 GND RXDSG SYRI RXDA (20) +2.8V L2 4.7u DRON RX-DATA TP15 +2.8V FREQ 10.368MHz 10.368MHz burst 428 s 406 s peak 0R00 +3.1V : No Components Digitized in Heiloo, Holland KX-TCD420BXM/BXS SCHEMATIC DIAGRAM (BASE UNIT)
  • Page 111 www.freeservicemanuals.info 1/2/2015 Speech Burst RXDA Decoding Decoding EARPIECE TXDA Speech Burst Encoding Encoding Module RSSI ADPCM SYRI Codec Interface Analog SYEN Filter Front XTAL CHARGE CHARGE CHARGE 10.368 CONTACTS CIRCUIT CHARGE DETECT ON SWITCH EEPROM VDDBAT 53~55, 59, 60 BATTERY SWITCHED ROWS TERMINAL...
  • Page 112 ADDRES BBIC 10.368 PROM D0-D7 DATA VUNREG CTRL 4.0V to AC Adaptor Reg. EEPROM 4.0V Page 103 104 106 105 107 2.65V Reg. 2.65V 11 14 13 12 Serial Flash ROM Digitized in Heiloo, Holland KX-TCD420BXM/BXS BLOCK DIAGRAM (BASE UNIT)

  • Page 113: X1 C25

    www.freeservicemanuals.info 1/2/2015 (F) (G) 2.20V ~ 2.40V TP16 TP12 TP13 TP17 TP14 TP19 AF SG DECT TESTER CMD60 TP18 TP10 Digital DECT tester Volt Meter CMD60 AF Volt Meter Oscilloscope DECT TESTER CMD60 Digital (I) (J) (K) (L) (M) Volt Meter (N) (O) (P) Frequency (D) (E)
  • Page 114 www.freeservicemanuals.info 1/2/2015 12Ω/2W Digital Volt Meter Digitized in Heiloo, Holland...
  • Page 115 www.freeservicemanuals.info 1/2/2015 Digital Volt Meter 12Ω/2W (D) (E) (F) (G) (H) (N) (O) Digital To PC (JIG) Digital Volt Meter Volt Meter J102 J103 J104 J101 J105 CHARGE TP13 CHARGE Frequency TP15 Counter TP11 TP106 TP10 Digital Volt Meter DTMF tester Digitized in Heiloo, Holland (F) (N) (O)

  • Page 116: Ic3

    www.freeservicemanuals.info 1/2/2015 AF Volt Meter Tel Simulator DECT tester CMD60 (N) (O) (H) (I) (J) (K) (L) AF Generator JMP4 JMP2 JMP6 JMP1 JMP5 JMP3 JMP8 JMP9 JMP7 SCLK JMP51 JMP52 JMP53 JMP50 Digitized in Heiloo, Holland...
  • Page 117 CHG terminal is properly fit in the cabinet. www.freeservicemanuals.info 1/2/2015 CHG terminal comes out of rib by pulling black lead wire when opening the cabinet and turning the PCB over. The terminal cannot have enough elastic force, cannot have good contact with Digitized in Heiloo, Holland handset, and it will result in charge problem.
  • Page 118 www.freeservicemanuals.info 1/2/2015 Microsoft Windows 2000 [Version 5.00.2195] (C) Copyright 1985-2000 Microsoft Corp. C: >cd dect C: DECT>SET RTX_COM=1 C: DECT>DOSKEY C: DECT>initbspin C: DECT>call wreeprom.bat 00 25 00 C: DECT>call wreeprom.bat 00 26 00 C: DECT>_ Digitized in Heiloo, Holland...
  • Page 119 www.freeservicemanuals.info 1/2/2015 Base PCB J105 J102 J103 J104 J103 GND MODE SCL SDA VDD Digitized in Heiloo, Holland Clip...
  • Page 120 www.freeservicemanuals.info 1/2/2015 Marked Marked Digitized in Heiloo, Holland (Component View) (Flow Solder Side View)
  • Page 121 www.freeservicemanuals.info 1/2/2015 TALK REDIAL BOOK LEFT DOWN RIGHT PROG POWER Digitized in Heiloo, Holland Marked...
  • Page 122 Marked www.freeservicemanuals.info 1/2/2015 Digitized in Heiloo, Holland...
  • Page 123 J104 www.freeservicemanuals.info 1/2/2015 J101 J103 J102 J105 CHARGE TP13 CHARGE TP15 TP11 TP106 TP10 Digitized in Heiloo, Holland Marked...
  • Page 124 www.freeservicemanuals.info 1/2/2015 Digitized in Heiloo, Holland CIRCUIT BOARD (CHARGER UNIT) Flow Solder Side View...

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