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KX-TGA680
(Handset)
(Charger Unit)
(Key detector KX-TG6873 only)
Configuration for each model
Model No
Base Unit
Handset Charger Unit Key detector Expandable
KX-TG6841 1 (TG6841) 1 (TGA680)
KX-TG6842 1 (TG6841) 2 (TGA680)
KX-TG6843 1 (TG6841) 3 (TGA680)
KX-TG6844 1 (TG6841) 4 (TGA680)
KX-TG6845 1 (TG6841) 5 (TGA680)
KX-TG6873 1 (TG6841) 3 (TGA680)
KX-TGA680*
1 (TGA680)
*KX-TGA680 is also an optional accessory, which contains a
handset and a charger.
KX-TG6841/6871
(Base Unit)
KX-TGA20
Up to 6
1
Up to 6
2
Up to 6
3
Up to 6
4
Up to 6
2
1
Up to 6
1
Telephone Equipment
KX-TG6841B
Model No.
KX-TG6842B
KX-TG6843B
KX-TG6844B
KX-TG6845B
KX-TG6873B
KX-TGA680B
KX-TGA20B
Digital Cordless Answering System
B: Black Version
(for U.S.A.)
© Panasonic System Networks Co., Ltd. 2013
Unauthorized copying and distribution is a violation
of law.
ORDER NO. KM41302656CE
F13
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Related Manuals for Panasonic KX-TG6841B
Summary of Contents for Panasonic KX-TG6841B
- Page 1 KX-TG6873 1 (TG6841) 3 (TGA680) Up to 6 KX-TGA680* 1 (TGA680) *KX-TGA680 is also an optional accessory, which contains a handset and a charger. © Panasonic System Networks Co., Ltd. 2013 Unauthorized copying and distribution is a violation of law.
- Page 2 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B WARNING This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electricity should be serviced or repaired only by experienced professional technicians.
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Page 3: Table Of Contents
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B TABLE OF CONTENTS PAGE PAGE 1 Safety Precautions----------------------------------------------- 5 11 Disassembly and Assembly Instructions--------------- 46 1.1. For Service Technicians --------------------------------- 5 11.1. Disassembly Instructions------------------------------- 46 2 Warning -------------------------------------------------------------- 5 11.1.1. Base Unit ---------------------------------------------- 46 2.1. Battery Caution--------------------------------------------- 5 11.1.2. Handset ------------------------------------------------ 48 2.2. - Page 4 16.2. Cabinet and Electrical Parts (Handset) ------------- 82 16.3. Cabinet and Electrical Parts (Charger Unit) ------- 83 16.4. Accessories and Packing Materials ----------------- 84 16.4.1. KX-TG6841B ----------------------------------------- 84 16.4.2. KX-TG6842B ----------------------------------------- 85 16.4.3. KX-TG6843B ----------------------------------------- 86 16.4.4. KX-TG6844B ----------------------------------------- 87 16.4.5.
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Page 5: Safety Precautions
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 1 Safety Precautions 1.1. For Service Technicians • Repair service shall be provided in accordance with repair technology information such as service manual so as to prevent fires, injury or electric shock, which can be caused by improper repair work. -
Page 6: About Lead Free Solder (Pbf: Pb Free)
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 2.2. 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. We will use PbF solder when discussing the lead free solder used in our manufacturing process which is made from Tin (Sn), Silver (Ag), and Copper (Cu). -
Page 7: Specifications
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 3 Specifications ■ ■ Standard: Bit rate: DECT 6.0 (Digital Enhanced Cordless 1,152 kbit/s ■ Telecommunications 6.0) Modulation: ■ Number of channels: GFSK (Gaussian Frequency Shift Keying) 60 Duplex Channels ■ RF transmission power: ■ Frequency range: 115 mW (max.) 1.92 GHz to 1.93 GHz... -
Page 8: Technical Descriptions
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 4 Technical Descriptions 4.1. US-DECT Description The frequency range of 1.92 GHz-1.93 GHz is used. Transmitting and receiving carrier between base unit and handset is same frequency. Refer to Frequency Table (P.61). 4.1.1. TDD Frame Format 5 ms 5 ms Up Link ( Handset - >... -
Page 9: Signal Flowchart In The Radio Parts
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 4.1.3. Signal Flowchart in the Radio Parts Reception Base unit: A voice signal from TEL line is encoded to digital data and converted into a 1.9GHz modulated radio signal by BBIC(IC501). The RF signal, after which is amplified in BBIC, is fed to selected antenna. -
Page 10: Block Diagram (Base Unit_Main)
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 4.2. Block Diagram (Base Unit_Main) -
Page 11: Block Diagram (Base Unit_Rf Part)
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 4.3. Block Diagram (Base Unit_RF Part) ANT2 ANT2 ANT1 DA802 ANT1 KX-TG6841/6842/6843/6844/6845/6873 BLOCK DIAGRAM (Base Unit_RF Part) -
Page 12: Circuit Operation (Base Unit)
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 4.4. Circuit Operation (Base Unit) General Description: (BBIC, Flash Memory, EERROM) is a digital 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 BBIC system is fully controlled by a host processor. The host processor provides activation and control of all that functions as follows. -
Page 13: Power Supply Circuit/Reset Circuit
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 4.4.4. Power Supply Circuit/Reset Circuit The power supply voltage from AC adaptor is converted to VBAT (3.0V) in IC302. And +3.0V for peripherals and analog part is insulated from VBAT by Doubler of BBIC. Circuit Operation: +3.0V VBAT IC601... - Page 14 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 4.4.4.1. Charge Circuit The voltage from the AC adaptor is supplied to the charge circuits. +5.5V F301 CHARGE+ CHARGE-...
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Page 15: Telephone Line Interface
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 4.4.5. Telephone Line Interface Telephone Line Interface Circuit: Function • Bell signal detection • ON/OFF hook and pulse dial circuit • Side tone circuit Bell signal detection and OFF HOOK circuit: In the idle mode, Q141 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 16: Parallel Connection Detect Circuit/Auto Disconnect Circuit
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 4.4.6. Parallel Connection Detect Circuit/Auto Disconnect 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 17: Calling Line Identification (Caller Id)/Call Waiting Caller Id
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 4.4.7. 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 18 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 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.
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Page 19: Block Diagram (Handset)
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 4.5. Block Diagram (Handset) ANT1 EEPROM 13.824 MHz VBAT CHG_DET RF part CHARGE RSTN RESET CONTROL CHARGE CHG_CTL POWER SUPPLY CONTROL BATTERY_ON VBAT BATTERY BBIC Receiver HSSPOUTP Headset Jack LOUT HSMIP 4.0V CN431 VBAT CHARGE HEADSET_DET (KEY) CP_OFF PUMP... -
Page 20: Block Diagram (Handset_Rf Part)
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 4.6. Block Diagram (Handset_RF Part) KX-TGA680 BLOCK DIAGRAM (Handset_RF Part) -
Page 21: Circuit Operation (Handset)
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 4.7. Circuit Operation (Handset) 4.7.1. Outline Handset consists of the following ICs as shown in Block Diagram (Handset) (P.19). • DECT BBIC (Base Band IC): IC1 - All data signals (forming/analyzing ACK or CMD signal) - All interfaces (ex: Key, Detector Circuit, Charge, EEPROM, LCD) •... -
Page 22: Charge Circuit
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 4.7.3. Charge Circuit Circuit Operation: When charging the handset on the Base Unit, the charge current is as follows; DCP(5.5V) → F301 → R371 → R372 → D362 → CHARGE+(Base) → CHARGE+(Handset) → R8 → Q3 → F1 → BATTERY+... -
Page 23: Behavior Of Electric Power Failure
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 4.8. Behavior of Electric Power Failure In case that the power from AC adaptor is lost and lose radio waves, BBIC (IC1) turns Q11 ON since handset presumes that base unit's power is falied. Base unit detects that power voltage of AC adaptor +5.5V is OFF, then turns Q351 ON. -
Page 24: Signal Route
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 4.10. Signal Route → → ROUTE SIGNAL ROUTE HANDSET TX HANDSET MIC - C11/13 - RA4 - IC1(22/23) - <HANDSET_RF_TX_ROUTE> - ANT. --- ---ANT. - <BASE_UNIT_RF_RX_ROUTE> - IC501(46/47 - 28) - C184 - Q161 - Q141 - D101 - P101 - T/R(TEL LINE) - Page 25 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B RF part signal route SIGNAL ROUTE ROUTE HANDSET RF IC1(44/45) - C802 - C808 - ANT [ TX_ROUTE ] HANDSET RF ANT - C808 - C801 - IC1(46/47) [ RX_ROUTE ] IC501(44/45) - C819 - C872 - DA802 - ANT1/ANT2...
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Page 26: Location Of Controls And Components
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 5 Location of Controls and Components Refer to the Operating Instructions. Note: You can download and refer to the Operating Instructions (Instruction book) on TSN Server. 6 Installation Instructions Refer to the Operating Instructions. Note: You can download and refer to the Operating Instructions (Instruction book) on TSN Server. -
Page 27: Test Mode
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 8 Test Mode 8.1. Engineering Mode 8.1.1. Base Unit Important: Make sure the address on LCD is correct when entering new data. Otherwise, you may ruin the unit. Soft keys {OFF} Navigator key/ (Volume) key Dial keypad {FLASH} {CALL WAIT}... - Page 28 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B Frequently Used Items (Base Unit) ex.) Items Address Default Data New Data Remarks Frequency 00 07 / 00 08 00/01 Use these items in a READ-ONLY mode to confirm the contents. Careless rewriting may 00 02 ~ 00 06 Given value cause serious damage to the computer system.
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Page 29: Handset
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 8.1.2. Handset Important: Make sure the address on LCD is correct when entering new data. Otherwise, you may ruin the unit. Soft keys {OFF} Navigator key/ (Volume) key Dial keypad {FLASH} {CALL WAIT} H/S key operation H/S LCD 1). Press... - Page 30 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B Frequently Used Items (Handset) ex.) Items Address Default Data New Data Possible Adjusted Possible Adjusted Remarks Value MAX (hex) Value MIN (hex) Battery Low 00 12/00 13 00 / 00 (*2) Frequency 00 07 / 00 08 00 / 01...
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Page 31: Service Mode
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 9 Service Mode 9.1. How to Clear User Setting (Handset Only) Handset Press simultaneously until a beep sound is heard. Then single handset is initialized. (The contents of user setting are reset to factory default) *Usage time is not cleared. -
Page 32: Troubleshooting Guide
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 10 Troubleshooting Guide 10.1. Troubleshooting Flowchart FLOW CHART Not working Power ON Base Unit Check Power No playback Playback Pre-Message Check Playback Not recording (*1) Record Check Record Link No link Not charged Battery Charge Check Battery Charge Check Link... -
Page 33: Check Power
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 10.1.1. Check Power 10.1.1.1. Base Unit Is the AC Adaptor inserted into AC outlet? (*1) AC Adaptor. Is output voltage of AC adaptor 5.5 V? Check Check Power Supply Circuit. Check VDDC (1.2 V): Test Point [VDDC] RSTN: Reset = "High"? Check Reset Circuit. -
Page 34: Check Record
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 10.1.2. Check Record 10.1.2.1. Base Unit Not record Incoming Message Check Telephone Line Interface Check Bell signal. [Bell]. Check Telephone Line Interface Does the unit catch line? [OFF HOOK]. Check Line In: Pin 16 of BBIC. Check ICM Recording in Signal Route. - Page 35 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B <How to change the Auto Disconnect activation time and VOX level> A) Auto Disconnect activation time: Some Telephone Company lines (fiber or cable) ON Hook and OFF Hook voltages are lower than conventional lines, which may cause a malfunction of Auto Disconnect detection. To solve this problem, try changing the Auto Disconnect activation through the procedures below.
- Page 36 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B B) Vox level: It makes easier to detect a small voice (caller) by raising the sensitivity of VOX level. Therefore, the recording of TAM is not turned off during detection. 1) ~ 2) are same as (A). 3) Press "5","1","1".
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Page 37: Check Playback
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 10.1.3. Check Playback 10.1.3.1. Base Unit Check VDDC (1.2 V): Test Point [VDDC] Check Power Supply Circuit. Check output of BBIC (Pin 29, 31). Check BBIC and Flash Memory. Check Speaker and its surroundings. Cross Reference: Note: Power Supply Circuit/Reset Circuit (P.13) Flash Memory is IC601. -
Page 38: Check Link
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 10.1.5. Check Link 10.1.5.1. Base Unit Does Base Unit connect to the properly working Base Unit is OK. Check Handset. Handset? Is the voltage of VBAT about 3.0 V? Check around Power Supply Circuit. Is the voltage of VDDC about 1.2 V? Is the voltage of +3.0V about 3.0 V? - Page 39 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 10.1.5.2. Handset Does Handset link with Base Unit? Handset is OK. Check Base Unit. (Properly working unit) Is the voltage of TP VBAT about 2.2~2.8 V? Check the batteries. Check around Power Supply Circuit/Reset Circuit. Is the voltage of TP VDDC about 1.2 V? Is the voltage of TP 3.0 V about 3.0 V?
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Page 40: Check The Rf Part
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 10.1.6. Check the RF part 10.1.6.1. Finding out the Defective part 1. Prepare Regular HS(*1) and Regular BU(*2). 2. a. Re-register regular HS (Normal mode) to base unit (to be checked). If this operation fails in some ways, the base unit is defective. - Page 41 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 10.1.6.2. RF Check Flowchart Each item (1 ~ 5) of RF Check Flowchart corresponds to Check Table for RF part (P.42). Please refer to the each item. Start Link Control Check BBIC interface parts. confirmation signal (RF Block <->BBIC on BU/HS P.C.B)
- Page 42 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 10.1.6.3. Check Table for RF part Item BU (Base Unit) Check HS (Handset) Check Link Confirmation Normal 1. Register Regular HS to BU (to be 1. Register HS (to be checked) to Regular checked). HS, BU Mode [Normal Mode] 2.
- Page 43 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 10.1.6.4. TEST RANGE Check Circuit block which range is defective can be found by the following check. Item BU (Base Unit) Check HS (Handset) Check Range Confirmation TX TEST 1. Register Regular HS to BU (to be checked). 1. Register HS (to be checked) to Regular BU.
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Page 44: Registering A Handset To The Base Unit
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 10.1.7. Registering a Handset to the Base Unit The supplied handset and base unit are pre-registered. If for some reason the handset is not registered to the base unit, re-register the handset. 1 Handset: {MENU} i # 1 3 0... -
Page 45: Check Handset Transmission
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 10.1.9. Check Handset Transmission Check MIC of handset. Check handset Tx in Signal Route. Cross Reference: Signal Route (P.24) 10.1.10. Check Handset Reception Check speaker of handset. Check handset Rx in Signal Route. Cross Reference: Signal Route (P.24) Note: When checking the RF part, Refer to Check the RF part (P.40). -
Page 46: Disassembly And Assembly Instructions
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 11 Disassembly and Assembly Instructions 11.1. Disassembly Instructions 11.1.1. Base Unit Remove the 5 screws to remove the cabinet cover. Remove the solders. Cabinet cover Solders Remove the pararell wire to remove the main P.C. board. - Page 47 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B Remove the 2 screws to remove the Jack holder. Remove the 4 screws to remove the operational P.C.B board.
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Page 48: Handset
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 11.1.2. Handset 2 screws Remove the 2 screws. Insert a JIG (PQDJ10006Y) between the cabinet body Cabinet body and the cabinet cover, then pull it along the gap to open the cabinet. Cabinet cover Likewise, open the other side of the cabinet. -
Page 49: Charger Unit
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 11.1.3. Charger Unit 2 charge terminals... -
Page 50: How To Replace The Base Unit Lcd
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 11.2. How to Replace the Base Unit LCD Fit the heatseal of a new LCD. Vertical Interval Tolerance 0.2mm Horizontal Interval Tolerance 0.2mm If interval tolerance between center lines is less than 0.2 mm, it is o.k. New LCD Operational P.C.B. - Page 51 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B Attach the LCD and fix by hook A (two points). Solder the wires.
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Page 52: How To Replace The Handset Lcd
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 11.3. How to Replace the Handset LCD Note: The illustrations are simplified in this page. They may differ from the actual product. P. C. board Vertical Interval Tolerance Peel off the FFC (Flexible Flat Cable) from 0.2 mm the LCD, in the direction of the arrow. Take care to ensure that the foil on the P.C. -
Page 53: Measurements And Adjustments
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 12 Measurements and Adjustments This chapter explains the measuring equipment, the JIG connection, and the PC setting method necessary for the measurement in Troubleshooting Guide (P.32) 12.1. Equipment Required • Digital multi-meter (DMM): it must be able to measure voltage and current. -
Page 54: Connections (Handset)
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 12.2.2. Connections (Handset) Connect the DC Power or Battery to BATT+ and BATT-. Connect the JIG cable GND (black) to GND. Connect the JIG cable UTX (yellow) to UTX and URX (red) to URX. URX (red) To Serial Port... -
Page 55: How To Install Batch File Into P.c
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 12.2.3. How to install Batch file into P.C. Insert the Batch file CD-ROM into CD-ROM drive and copy PNZZTG**** folder to your PC (example: D drive). <Example for Windows> On your computer, click [Start], select Programs Open an MS-DOS mode window. -
Page 56: Commands (Base Unit)
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 12.2.4. Commands (Base Unit) 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. -
Page 57: Adjustment Standard (Base Unit)
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 12.3. Adjustment Standard (Base Unit) When connecting the simulator equipment for checking, please refer to below. 12.3.1. Bottom View +5.5V UGND D472 C454 C456 RA451 C451 D473 C178 +3.0V VREF R451 RA452 R331 VCCA C459 VBAT R332 R505 C460... -
Page 58: Adjustment Standard (Handset)
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 12.4. Adjustment Standard (Handset) When connecting the simulator equipment for checking, please refer to below. 12.4.1. Component View ANT-Short ANT-Short-GND ANT1 RECEIVER PNLB2159Z -GW KX-TGA680 C70 C71 C809 CKM/STM C807 ATSTN C803 ATSTP L802 C804 RSTN C802 GND_J 3.0V... -
Page 59: Things To Do After Replacing Ic Or X'tal
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 12.5. Things to Do after Replacing IC or X'tal If repairing or replacing EEPROM and X'tal, it is necessary to download the required data such as Programming data or adjustment data, etc in memory. The set doesn't operate if it is not executed. - Page 60 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 12.5.1.2. Handset First, operate the PC setting according to The Setting Method of JIG (P.53). Then download the appropriate data according to the following procedures. Items How to download/Required adjustment EEPROM (IC3) Adjusted parameter data is stored in memory.
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Page 61: Frequency Table
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 12.6. Frequency Table Ch. (hex) TX/RX Frequency (MHz) Channel 0 1928.448 Channel 1 1926.720 Channel 2 1924.992 Channel 3 1923.264 Channel 4 1921.536... -
Page 62: Miscellaneous
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 13 Miscellaneous 13.1. How to Replace the LLP (Leadless Leadframe Package) IC Note: This description only applies to the model with Shield case. 13.1.1. Preparation • PbF (: Pb free) Solder • Soldering Iron Tip Temperature of 700 °F ± 20 °F (370 °C ± 10 °C) Note: We recommend a 30 to 40 Watt soldering iron. -
Page 63: How To Install The Ic
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 13.1.4. How to Install the IC 1. Place the solder a little on the land where the radiation GND pad on IC bottom is to be attached. Soldering Iron Land Solder P.C.Board 2. Place the solder a little on the land where IC pins are to be attached, then place the IC. -
Page 64: How To Replace The Flat Package Ic
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 13.2. How to Replace the Flat Package IC Even if you do not have the special tools (for example, a spot heater) to remove the Flat IC, with some solder (large amount), a soldering iron and a cutter knife, you can easily remove the ICs that have more than 100 pins. -
Page 65: How To Install The Ic
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 13.2.3. How to Install the IC 1. Temporarily fix the FLAT PACKAGE IC, soldering the two marked pins. *Check the accuracy of the IC setting with the corresponding soldering foil. 2. Apply flux to all pins of the FLAT PACKAGE IC. -
Page 66: Terminal Guide Of The Ics, Transistors And Diodes
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 13.3. Terminal Guide of the ICs, Transistors and Diodes 13.3.1. Base Unit (Reverse View) 2SC6054JSL, B1ABDM000001 B1ADNB000003, DRC9113Z0L PNWI1TG6841H B1ADCF000040, B1GBCFGA0021 C0DBEYY00102 PNWI2TG6841H 2SA1576S, B1GBCFYY0020 C2HBCY000126 Cathode Anode Cathode Anode DA2J10100L DY2J25000L DSC7003S0L B0EDER000009 B0ECKM000008 B1ACGP000008 Cathode Cathode Anode... -
Page 67: Schematic Diagram
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 14 Schematic Diagram 14.1. For Schematic Diagram 14.1.1. Base Unit (Schematic Diagram (Base Unit_Main)) Notes: 1. DC voltage measurements are taken with voltmeter from the negative voltage line. Important Safety Notice: Components identified by mark have special characteristics important for safety. -
Page 68: Schematic Diagram (Base Unit_Main)
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 14.2. Schematic Diagram (Base Unit_Main) RF BLOCK ANT1 C892 ANT1 W 0.2mm L mm 1st layer Wm=0.4mm Lm=10mm C894 C872 1.3p C895 W 0.2mm C873 C871 DA802 1.5p L 10mm 1st layer SHORT1 W 0.2mm W 0.15mm L 3.8mm L 6.2mm... - Page 69 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B REFERENCE REFERENCE 1XX : TEL LINE 1XX : TEL LINE 3XX : POWER, CHARGE 3XX : POWER, CHARGE 4XX : MIC, SP 4XX : MIC, SP +3.0V 5XX : BBIC 5XX : BBIC 6XX : FLASH, EEPROM, KEY, LCD...
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Page 70: Schematic Diagram (Base Unit_Operation)
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 14.3. Schematic Diagram (Base Unit_Operation) LCD_Light KEY_PCB+ CN901 R906 C902 KEY_PCB- CN901 1u 16V CN901 C901 CN901 VDDA CN901 CN901 CN901 SCLK CN901 CN901 RESETB LCD_CSB CN901 CN901 OPT_PWR LCD_SIO CN901 LCD_VDD LCD_GND LCD_BLT LCD_SCL LCD_CD 13pin:TG6841/TG7871 LCD_RST CELL1... -
Page 71: Schematic Diagram (Base Unit_Led)
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 14.4. Schematic Diagram (Base Unit_LED) KX-TG6841/6842/6843/6844/6845/6873 SCHEMATIC DIAGRAM (Handset_LED) -
Page 72: Schematic Diagram (Handset_Main)
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 14.5. Schematic Diagram (Handset_Main) VBAT Charge Current BAT+ 2.5A BAT- Battery CHG_CUR R10 1.0 CP3V When on Charge Battery_ON 0.1u * Start Monitor 1000p 3.3k EEP_WP * When "SFR" command CHG+ EEP_SCL is executed, 13.824MHz EEP_SDA CHG+ frequency will be output. - Page 73 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B RF BLOCK ANT-Pattern ANT-Short Wm=0.4mm C808 Lm=10mm 1.3p C801 ANT1 ANT-Short-GND SHORT1 W=0.3mm W=0.3mm W=0.3mm W=0.25 W 0.2mm L=12.45mm L=6.95mm L=6.5mm W 0.15mm L=2mm L 3.8mm L 6.2mm 1st layer 1st layer Tx-balun open-stub open-stub W=0.3 W=0.2mm L=40mm W=2.9mm W=0.25...
- Page 74 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B Memo...
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Page 75: Printed Circuit Board
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 15 Printed Circuit Board 15.1. Circuit Board (Base Unit_Main) 15.1.1. Component View Q654 Q652 Q651 RA653 L501 C502 RA652 RA651 C504 R701 C520 C507 C522 X501 R511 C511 IC501 R702 C510 R891 C891 C517 L803 R504 C341 C874 R503... -
Page 76: Bottom View
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 15.1.2. Bottom View For JIG +5.5V UGND D472 C454 C456 RA451 C451 D473 C178 +3.0V VREF R451 RA452 VBAT R331 VCCA C459 R332 R505 C460 CHARGE- CHARGE+ C601 C331 VDDC C521 IC601 C473 L476 D362 L474 D153 C611 D133... -
Page 77: Circuit Board (Base Unit_Operation)
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 15.2. Circuit Board (Base Unit_Operation) C912 KX-TG6841/6842/6843/6844/6845/6873 CIRCUIT BOARD (Base Unit_Operation (Component View)) 15.3. Circuit Board (Base Unit_LED) PNLB1964Z KX-TG6841/6842/6843/6844/6845/6873 CIRCUIT BOARD (Handset_LED (Component View)) - Page 78 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B Memo...
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Page 79: Circuit Board (Handset_Main)
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 15.4. Circuit Board (Handset_Main) 15.4.1. Component View ANT-Short ANT-Short-GND ANT1 RECEIVER PNLB2159Z -GW KX-TGA680 C70 C71 C809 CKM/STM C807 CKM/STM ATSTN C803 ATSTP (CLK:13.824MHz) RSTN L802 C804 C802 GND_J 3.0V (Output) 3.0V RF-SHIELD VDDC CHG_CUR VBG/CHG_MON MIC+ MIC+ MIC-... -
Page 80: Bottom View
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 15.4.2. Bottom View CN3_C SOFT_A SOFT_C LEFT RIGHT LED5 LED4 LED2 LED3 SHARP LED6 LED1 FLASH KX-TGA680 CIRCUIT BOARD (Handset_Main (Bottom View)) -
Page 81: Exploded View And Replacement Parts List
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 16 Exploded View and Replacement Parts List 16.1. Cabinet and Electrical Parts (Base Unit) E1 (*1) PCB1 PCB2 MIC1 Ref.No. Figure 2.6 x 8mm Note: (*1) This cable is fixed by heat-sealing. Refer to How to Replace the Base Unit LCD (P.50). -
Page 82: Cabinet And Electrical Parts (Handset)
(*1) This cable is fixed by heat-sealing. Refer to How to Replace the Handset LCD (P.52). (*2) The rechargeable Ni-MH battery HHR-4DPA is available through sales route of Panasonic. (*3) Attach the SPACER (No. 118) to the exact location described above. -
Page 83: Cabinet And Electrical Parts (Charger Unit)
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 16.3. Cabinet and Electrical Parts (Charger Unit) 200-1 200-5 200-2 200-2 200-3 200-4... -
Page 84: Accessories And Packing Materials
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 16.4. Accessories and Packing Materials 16.4.1. KX-TG6841B... -
Page 85: Kx-Tg6842B
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 16.4.2. KX-TG6842B P102 A102 P102 A104 (*1) A101 P102 A103 P101 Note: (*1) This pad is a piece of Ref No.P101 (GIFT BOX). -
Page 86: Kx-Tg6843B
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 16.4.3. KX-TG6843B P202 P202 P202 P202 A202 P202 P202 A201 P202 A204 A203 P201... -
Page 87: Kx-Tg6844B
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 16.4.4. KX-TG6844B P302 P302 P302 P302 P302 P302 P302 A301 A302 A303 A304 P301... -
Page 88: Kx-Tg6845B
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 16.4.5. KX-TG6845B P402 P402 P402 P402 P402 P402 P402 A402 A401 P402 A403 A404 P401... -
Page 89: Kx-Tg6873B
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 16.4.6. KX-TG6873B P502 P502 P502 P502 A502 P502 P502 A501 A506 P502 A503, A504, A505 P501... -
Page 90: Kx-Tga680B
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 16.4.7. KX-TGA680B A602 (*1) P602 A601 P601 Note: (*1) This pad is a piece of Ref No.P601 (GIFT BOX). -
Page 91: Replacement Parts List
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 16.5. Replacement Parts List Safety Ref. Part No. Part Name & Description Remarks 1. RTL (Retention Time Limited) PNHR1759Z GUIDE, JACK PS-HB K2ECYZ000001 JACK, DC Note: PQJJ1T039H JACK, MODULAR The “RTL” marking indicates that its Retention Time is PQMG10025W RUBBER PARTS, MIC Limited. - Page 92 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks R133 ERJ3GEYJ334 330k C501 ECUE1A104KBQ 0.1 R141 D0GB104JA057 100k C502 ECJ1VB0G106M 10 R142 PQ4R18XJ272 2.7k C503 ECJ1VB0G106M 10 R145 D0GA222JA021 2.2k...
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Page 93: Handset
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 16.5.2. Handset Safety Ref. Part No. Part Name & Description Remarks 16.5.2.1. Cabinet and Electrical Parts EXB24V331J RESISTOR ARRAY EXB24V332JX RESISTOR ARRAY EXB28V332JX RESISTOR ARRAY (IC FILTER) Safety Ref. Part No. Part Name & Description Remarks J0JDC0000045 IC FILTER... -
Page 94: Charger Unit
PNKE1268Z1 HANGER, BELT CLIP ABS-HB Instructions (Instruction book) on TSN Server. P501 PNPK3635007Z GIFT BOX P502 PNPD1776Z CUSHION 16.5.4.1. KX-TG6841B 16.5.4.7. KX-TGA680B Safety Ref. Part No. Part Name & Description Remarks Safety Ref. Part No. Part Name & Description Remarks... -
Page 95: Screws
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B 16.5.5. Screws Safety Ref. Part No. Part Name & Description Remarks XTB26+8GFJ TAPPING SCREW XTB2+8GFJ TAPPING SCREW 16.5.6. Fixtures and Tools Note: (*1) See Equipment Required (P.53), and The Setting Method of JIG (P.53) (*2) When replacing the Handset LCD, See How to Replace the Handset LCD (P.52) - Page 96 KX-TG6873B KX-TGA680B KX-TGA20B Digital Cordless Answering System B: Black Version (for U.S.A.) Please file and use this supplement manual together with the service manual for Model No.KX-TG6841B/ KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B/KX-TGA20B, Order No. KM41302656CE. TABLE OF CONTENTS PAGE 1 REPLACEMENT PARTS LIST--------------------------------- 2 1.1.
- Page 97 KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B/KX-TGA20B 1 REPLACEMENT PARTS LIST 1.1. REFERENCE CHART Reason for Change *The following items (1-8) indicate the reason for change. See the “Notes” column for each part in ORIGINAL AND NEW PARTS COMPARISON LISTS. 1. Improve performance Remarks: *m : Discontinued (To be replaced with a new part) 2.