Panasonic KX-TG3611BXB User manual

© Panasonic Communications Co., Ltd. 2009.
Unauthorized copying and distribution is a violation
of law.
ORDER NO. KM40903838CE
Telephone Equipment
Model No. KX-TG3611BXB
KX-TG3611BXS
KX-TG3612BXB
KX-TG3612BXS
KX-TGA361BXB
KX-TGA361BXS
2.4 GHz Digital Cordless Phone
B: Black Version
S: Pearl White Version
(for Asia, Middle Near East and other areas)

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX
TABLE OF CONTENTS
PAGE PAGE
1 Safety Precautions----------------------------------------------- 4
1.1. For Service Technicians --------------------------------- 4
2 Warning -------------------------------------------------------------- 4
2.1. Battery Caution--------------------------------------------- 4
2.2. About Lead Free Solder (PbF: Pb free)-------------- 4
2.3. Discarding of P. C. Board-------------------------------- 5
3 Specifications ----------------------------------------------------- 6
4 Technical Descriptions ----------------------------------------- 7
4.1. FHSS Description ----------------------------------------- 7
4.2. Explanation of Link Data Communication ----------10
4.3. Block Diagram (Base Unit_Main)---------------------11
4.4. Block Diagram (Base Unit_RF Part)-----------------12
4.5. Circuit Operation (Base Unit)--------------------------13
4.6. Block Diagram (Handset)-------------------------------22
4.7. Block Diagram (Handset_RF Part)-------------------23
4.8. Circuit Operation (Handset)----------------------------24
4.9. Circuit Operation (RF Part)-----------------------------28
4.10. Circuit Operation (Charger Unit) ----------------------29
4.11. Signal Route -----------------------------------------------30
5 Location of Controls and Components ------------------31
5.1. Controls -----------------------------------------------------31
5.2. Display ------------------------------------------------------31
6 Installation Instructions ---------------------------------------32
6.1. Setting up---------------------------------------------------32
6.2. Battery Installationand replacement -----------------32
6.3. Battery Charge --------------------------------------------33
7 Operating Instructions-----------------------------------------34
7.1. Programmable Settings ---------------------------------34
7.2. Dial Lock ----------------------------------------------------36
7.3. Error Messages -------------------------------------------36
7.4. Troubleshooting-------------------------------------------37
8 Test Mode ----------------------------------------------------------40
8.1. Adjustment and Test Mode Flow Chart -------------40
9 Service Mode -----------------------------------------------------50
9.1. How to Clear User Setting------------------------------50
10 Troubleshooting Guide ----------------------------------------51
10.1. Troubleshooting Flowchart -----------------------------51
10.2. How to Replace the Flat Package IC----------------62
10.3. How to Replace the LLP (Leadless Leadframe
Package) IC------------------------------------------------64
11 Disassembly and Assembly Instructions ---------------67
11.1. Disassembly Instructions -------------------------------67
11.2. How to Replace the Handset LCD -------------------70
12 Measurements and Adjustments---------------------------71
12.1. Things to Do after Replacing IC ----------------------71
12.2. Base Unit Reference Drawing-------------------------72
12.3. Handset Reference Drawing---------------------------74
12.4. Frequency Table ------------------------------------------75
12.5. How to make a U-ART Jig (Base Unit)--------------76
12.6. U-ART Jig Connection ----------------------------------76
12.7. Test Mode (Base Unit)-----------------------------------77
13 Miscellaneous ----------------------------------------------------78
13.1. CPU Data (Base Unit) -----------------------------------78
13.2. CPU Data (Handset)-------------------------------------79
13.3. Explanation of IC Terminals (RF Part)---------------80
13.4. Terminal Guide of the ICs, Transistors and
Diodes -------------------------------------------------------81
14 Schematic Diagram ---------------------------------------------83
14.1. For Schematic Diagram -------------------------------- 83
14.2. Schematic Diagram (Base Unit_Main)-------------- 84
14.3. Schematic Diagram (Base Unit_RF Part)---------- 86
14.4. Schematic Diagram (Handset_Main) --------------- 88
14.5. Schematic Diagram (Handset_RF Part)------------ 90
14.6. Schematic Diagram (Charger Unit)------------------ 91
15 Printed Circuit Board ------------------------------------------ 93
15.1. Circuit Board (Base Unit_Main) ---------------------- 93
15.2. Circuit Board (Base Unit_RF Part)------------------- 95
15.3. Circuit Board (Handset_Main) ------------------------ 97
15.4. Circuit Board (Handset_RF Part) -------------------- 99
15.5. Circuit Board (Charger Unit)------------------------- 100
16 Exploded View and Replacement Parts List --------- 101
16.1. Cabinet and Electrical Parts (Base Unit)--------- 101
16.2. Cabinet and Electrical Parts (Handset)----------- 102
16.3. Cabinet and Electrical Parts (Charger Unit) ----- 103
16.4. Accessories---------------------------------------------- 104
16.5. Replacement Parts List------------------------------- 105

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX
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 pre-
vent fires, injury or electric shock, which can be caused by improper repair work.
1. When repair services are provided, neither the products nor their parts or members shall be remodeled.
2. If a lead wire assembly is supplied as a repair part, the lead wire assembly shall be replaced.
3. FASTON terminals shall be plugged straight in and unplugged straight out.
•ICs and LSIs are vulnerable to static electricity.
When repairing, the following precautions will help prevent recurring malfunctions.
1. Cover plastic parts boxes with aluminum foil.
2. Ground the soldering irons.
3. Use a conductive mat on worktable.
4. Do not grasp IC or LSI pins with bare fingers.
2Warning
2.1. Battery Caution
1. Danger of explosion if battery is incorrectly replaced.
2. Replace only with the same or equivalent type recommended by the manufacturer.
3. Dispose of used batteries according to the manufacturer's Instructions.
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 con-
tains 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).
This model, and others like it, manufactured using lead free solder will have PbF stamped on the PCB. For service and repair
work we suggest using the same type of solder.
Caution
• PbF solder has a melting point that is 50°F ~ 70°F (30°C ~ 40°C) higher than Pb solder. Please use a soldering iron with temper-
ature control and adjust it to 700°F ± 20°F (370°C ± 10°C).
• Exercise care while using higher temperature soldering irons.:
Do not heat the PCB for too long time in order to prevent solder splash or damage to the PCB.
• PbF solder will tend to splash if it is heated much higher than its melting point, approximately 1100°F (600°C).
• When applying PbF solder to double layered boards, please check the component side for excess which may flow onto the
opposite side (See the figure below).

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX
2.2.1. Suggested PbF Solder
There are several types of PbF solder available commercially. While this product is manufactured using Tin, Silver, and Copper
(Sn+Ag+Cu), you can also use Tin and Copper (Sn+Cu), or Tin, Zinc, and Bismuth (Sn+Zn+Bi). Please check the manufac-
turer's specific instructions for the melting points of their products and any precautions for using their product with other materi-
als.
The following lead free (PbF) solder wire sizes are recommended for service of this product: 0.3 mm, 0.6 mm and 1.0 mm.
2.3. Discarding of P. C. Board
When discarding P. C. Board, delete all personal information such as telephone directory and caller list or scrap P. C. Board.

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX
3 Specifications

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX
4 Technical Descriptions
4.1. FHSS Description
4.1.1. Frequency
The frequency range of 2.4 GHz-2.48 GHz is used. Transmitting and receiving channel between base unit and handset is same fre-
quency. Refer to Frequency Table (P.75).
4.1.2. FHSS (Frequency Hopping Spread Spectrum)
This telephone is using an IC chip which has similar specification to WDCT (World Digital Cordless Telephone) and is the tele-
phone system that can use multiple portable unit simultaneously. The explanation of this system is mentioned below. This sys-
tem uses a Time Division Multiple Access/Time Division Duplex (TDMA/TDD) scheme:
transmitting and receiving frequencies of the base unit and handset are shared in the same frequency. The construction of RX/
TX frequency data is shown below. It consists of 4 slots from the base unit to the handset, and 4 slots from the handset to the
base unit, total 8 slots in 10 ms. By this slot system, simultaneous air link and communication between 4 handsets and the base
unit can be realized. One communication between handset and the base unit is done by one slot from the base unit to handset,
and another slot from handset to the base unit.
DSS makes spectrum spread by multiplying carrier signal by PN code. The purpose to make spectrum spread is to reduce
power density per time and per band. On the other hand, FHSS makes spectrum spread by changing channel every 10 ms
according to Hopping table. Also the purpose to make spectrum spread is to reduce power density per time and per band.

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX
4.1.2.1. TDD Frame Format
Sync Field (72 bit): Preamble 56 bit + SyncWord 16 bit
Base unit (handset) adjusts the timing of reception so that reception of base unit (handset) can correspond to transmission of
handset (base unit).
It is necessary for sync-field that handset gets synchronization.
A - field (64 bit): Each kinds of DATA: ch data, line condition, etc.
B - field (320 bit + 80 bit): Sound data + parity
Z - field (4 bit): Parity Check
4.1.2.2. TDMA system
This system is the cycles of 10 ms, and has four duplex paths,
so it is possible to perform four duplex communications simultaneously.
In 1 slot 1.25 ms, the 10 ms of voice data is transmitted.
Each slot makes every frame frequency hop. (100 hops/sec.)
Although each slot (UpLink3 and UpLink4) uses different frequency, UpLink3 and DownLink3 use the same frequency.
•2 - Handsets Link
Traffic Bearer
A link is established between base unit and handset.
The state where duplex communication is performed.
The hopping pattern of a 1800 hops (18 seconds) cycle.
Dummy Bearer
The base unit sends Dummy-data to the all stand-by state handsets.
The handsets receive that data for keeping synchronization and monitoring request from the base unit.
Dummy Bearer doesn't contain B-field (sound) data.

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX
4.1.3. Signal Flowchart in the Whole System
Reception
CN101 of the base unit is connected to the TEL line, and signal is entered through the bridge diode DI01. While talking, the relay
(Q141) is turned ON and amplified at the Q17I, then led to DSP (IC501). The DSP encodes ADPCM and TDD/TDMA with FHSS
to TX-DATA. The TX-DATA signal is entered to IC703 of RF UNIT, and modulated to 2.4 GHz. The RF signal is fed into Tx/Rx
switch (D701). The RF signal is fed to Antenna.
As for the handset, RF signal from the antenna is routed by Tx/Rx switch (D701) and led to IC703. The RF signal is amplified by
LNA and down-converted to IF signal in IC701. The IF signal passing through internal filter is demodulated into RX-DATA. then
enters DSP (IC501). The DSP performs TDD/TDMA and ADPCM decoding to convert the RX-DATA into the voice signal, then it
is output to the speaker.
Transmission
The voice signal entering from the microphone is led to DSP (IC501). The DSP encodes ADPCM and TDD/TDMA with FHSS to
TX-DATA. The TX-DATA signal enters IC703 of RF UNIT, and is modulated to 2.4 GHz. The RF signal is fed into Tx/Rx switch
(D701). The RF signal is fed to Antenna.
As for the base unit. RF signal from the Antenna is routed by Tx/Rx switch (D701) and led to IC703. The RF signal is amplified
by LNA and down-converted to IF signal in IC703. The IF signal passing through internal filter is demodulated, then enters DSP
(IC501). The DSP performs TDD/TDMA and ADPCM decoding to convert the RX-DATA into the voice signal. The voice signal is
amplified at the TX amplifier (Q161). then output to the TEL line CN101 through the relay (Q141) and bridge (D101).

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX
4.2. Explanation of Link Data Communication
4.2.1. Calling
4.2.2. To Terminate Communication
4.2.3. Ringing

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX
4.3. Block Diagram (Base Unit_Main)
KEY1
SW662
IC321
3V
REGULATOR
D101
CHARGE_CONTACT
+
-
X501
13.824 MHz
ANT
TEL JACK
L1T L1R DCP DCM
DC JACK
RLY
SIDE TONE CIRCUIT
Q161
Q141
BELL DETECT
RLY
BELL
Q111
LIN
LOUT
RF_PART
CID_IN CID_IN
IC501
DSP
4.0 V
CONVERTOR
INUSE DETECT 2
INUSE DETECT 1
RECEIVE AMP
DCIN 1 DCIN 2
IC331
RESET
POWER_DOWN
VCCIN
VCC
VCCA
VCCPA
INT1
V_RF
INT1 5
VCC
IC611
EEPROM
IC300, Q300
R151,R152 R131, R133
Q171
V_RF(VPA)
SCL,SDA,
WP
3.3 V REGULATOR with RESET
R371
BCLK RADIO_EN SLOT_CTRL SYN_DATA SYN_CLK TXDATA RXDATA SYN_EN SYN_OUT RF_RESET
KX-TG3611/3612 BLOCK DIAGRAM (Base Unit_Main)

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX
4.4. Block Diagram (Base Unit_RF Part)
V_PA V_RF VCCIO
Note: (*1) Antenna Type: wired monopole antenna
PLL
13.824 MHz
IC703
ANT ( *1)
Control
Logic
Mixer A/D
Demodulator
delta-sigma Modulator
D701
BCLK SYN_OUT SYN_EN SYN_CLK SYN_DATA SLOT_CTROL RADIO_EN TRXDATA RF_RSTN
Divider
1.5
DSP
IC501
KX-TG3611/3612 BLOCK DIAGRAM (Base Unit_RF Part)

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX
4.5. Circuit Operation (Base Unit)
General Description:
(DSP, EEPROM) is a digital speech/signal processing system that implements all the functions of speech compression.
The DSP system is fully controlled by a host processor DSP. The host processor provides activation and control of all that func-
tions as follows.
4.5.1. DSP (Digital Speech/Signal Processing: IC501)
•DTMF Generator
When the DTMF data from the handset is received, the DTMF signal is output.
•Caller ID demodulation
The DSP implements monitor and demodulate the FSK signals that provide CID information from the Central Office.
•Digital Switching
The voice signal from telephone line is transmitted to the handset or the voice signal from the handset is transmitted to the Tele-
phone line, etc. They are determined by the signal path route operation of voice signal.
•Block Interface Circuit
RF part, LED, Telephone line.
4.5.2. EEPROM (IC601)
Following information data is stored.
•Settings
ex: ID code, Flash Time, Tone/Pulse

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX
4.5.3. Power Supply Circuit
Function:
The power supply voltage from AC adaptor is converted to the desired voltage of each block.
Circuit Operation:
• IC332: 3.3 V Regulator
• IC331: 3.0 V Regulator

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX
4.5.3.1. Charge Circuit
The voltage from the AC adaptor is supplied to the charge circuits.

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX
4.5.4. Reset Circuit
Function:
This circuit is used to initialize the microcomputer when it incorporates an AC adaptor.
Circuit Operation:
When the AC Adaptor is inserted into the unit, then the voltage is shifted by IC331 and power is supplied to the DSP.
The set starts to operate when VCC goes up to 3.0 V or more in the circuit voltage diagram.
Note:
(*1) The initializing time of the DSP chip is 28 ms under normal conditions.

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX
4.5.5. 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 →L101 →R111 →C111 →Q111 →DSP pin 58 [BELL]
When the CPU (DSP) detects a ring signal, Q141 turns on, thus providing an off-hook condition (active DC current flow through
the circuit). Following signal flow is the DC current flow.
T →L101 →D101 →Q141 →Q161 →R163 →R167 →D101 →L102 →P101 →R
ON HOOK Circuit:
Q141 is open, Q141 is connected as to cut the DC loop current and to cut the voice signal. The unit is consequently in an on-
hook condition.
Pulse Dial Circuit:
Pin 59 of DSP turns Q141 ON/OFF to make the pulse dialing.
Side Tone Circuit:
Basically this circuit prevents the TX signal from feeding back to RX signal. As for this unit, TX signal feed back from Q161 is
canceled by the canceller circuit of DSP.

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX
4.5.6. 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 of pin 90 of IC501 is monitored. If a parallel-connected telephone is put into OFF HOOK status, the presence/
absence of a parallel connection is determined when the voltage changes by 0.2 V or more. When the set detects the parallel-
connected telephone is OFF HOOK status, the line is disconnected.
You can enable or disable the Auto Disconnect function.

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX
4.5.7. Parallel Connection Detect 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 con-
nected in parallel is on hook or off hook by detecting changes in the T/R voltage.
Circuit Operation:
Parallel connection detection when on hook:
When on hook, the voltage is monitored at pin 86 of IC501. 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.
Parallel connection detection when off hook:
When off hook, the voltage is monitored at pin 90 of IC501; the presence/absence of a parallel connection is determined when
the voltage changes by 0.2 V or more.

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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX
4.5.8. 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. The data for the caller ID from the telephone exchange is sent during the interval between the
first and second rings of the bell signal. The data from the telephone exchange is a modem signal which is modulated in an FSK
(Frequency Shift Keying) * format. Data "1"is a 1200 Hz sine wave, and data "0"is a 2200 Hz sine wave. There are two types of
the message format which can be received: i.e. the single message format and plural message format. The plural message for-
mat allows to transmit the name and data code information in addition to the time and telephone number data.
*: Also the telephone exchange service provides other formats.