Panasonic KX-TG4131MEB User manual

© Panasonic System Networks Co., Ltd. 2011
Unauthorized copying and distribution is a violation
of law.
ORDER NO. KM41106440CE
Telephone Equipment
Model No. KX-TG4131MEB
KX-TG4132MEB
KX-TG4133MEB
KX-TGA410MEB
Digital Cordless Answering System
B: Black Version
(for Mexico)
Caller ID Compatible
Model No Base Unit Handset Charger Unit Expandable
KX-TG4131
1 (TG4131) 1 (TGA410) Up to 6
KX-TG4132
1 (TG4131) 2 (TGA410) 1 Up to 6
KX-TG4133
1 (TG4131) 3 (TGA410) 2 Up to 6
Configuration for each model
Information for optional accessories
You can expand your phone system by registering optional
handsets (KX-TGA660ME) to a single base unit.
Optional handsets and the supplied handset are different model
so that some functions may not be available.
Refer to each Operating Instruction for details.
(Handset)
KX-TGA410MEB KX-TG4131MEB
(Base Unit)
(Charger Unit)

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KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
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. Any attempt to service or repair the product or products dealt with in this service information by anyone
else could result in serious injury or death.
IMPORTANT SAFETY NOTICE
There are special components used in this equipment which are important for safety. These parts are marked by
in the Schematic Diagrams, Circuit Board Diagrams, Exploded Views and Replacement Parts List. It is essential that
these critical parts should be replaced with manufacturer’s specified parts to prevent shock, fire or other hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT INFORMATION ABOUT LEAD FREE, (PbF), SOLDERING
If lead free solder was used in the manufacture of this product, the printed circuit boards will be marked PbF.
Standard leaded, (Pb), solder can be used as usual on boards without the PbF mark.
When this mark does appear, please read and follow the special instructions described in this manual on the
use of PbF and how it might be permissible to use Pb solder during service and repair work.
LWhen you note the serial number, write down all 11 digits. The serial number may be found on the bottom of the unit.
LThe illustrations in this Service Manual may vary slightly from the actual product.

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KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
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. US-DECT Description ------------------------------------ 7
4.2. Block Diagram (Base Unit_Main)---------------------- 9
4.3. Block Diagram (Base Unit_RF Part) -----------------10
4.4. Circuit Operation (Base Unit) -------------------------- 11
4.5. Block Diagram (Handset)-------------------------------18
4.6. Block Diagram (Handset_RF Part)-------------------19
4.7. Circuit Operation (Handset)----------------------------20
4.8. Circuit Operation (Charger Unit) ----------------------22
4.9. Signal Route -----------------------------------------------23
5 Location of Controls and Components ------------------25
6 Installation Instructions ---------------------------------------25
7 Operating Instructions-----------------------------------------25
8 Test Mode ----------------------------------------------------------26
8.1. Engineering Mode ----------------------------------------26
9 Service Mode -----------------------------------------------------30
9.1. How to Clear User Setting (Handset Only)---------30
10 Troubleshooting Guide ----------------------------------------31
10.1. Troubleshooting Flowchart -----------------------------31
11 Disassembly and Assembly Instructions ---------------45
11.1. Disassembly Instructions -------------------------------45
11.2. How to Replace the Base Unit LCD -----------------49
11.3. How to Replace the Handset LCD -------------------51
12 Measurements and Adjustments---------------------------52
12.1. Equipment Required -------------------------------------52
12.2. The Setting Method of JIG -----------------------------52
12.3. Adjustment Standard (Base Unit)---------------------56
12.4. Adjustment Standard (Charger Unit)-----------------57
12.5. Adjustment Standard (Handset) ----------------------58
12.6. Things to Do after Replacing IC or X'tal ------------59
12.7. Frequency Table ------------------------------------------61
13 Miscellaneous ----------------------------------------------------62
13.1. How to Replace the LLP (Leadless Leadframe
Package) IC------------------------------------------------62
13.2. How to Replace the Flat Package IC----------------64
13.3. Terminal Guide of the ICs, Transistors and
Diodes -------------------------------------------------------66
14 Schematic Diagram ---------------------------------------------67
14.1. For Schematic Diagram---------------------------------67
14.2. Schematic Diagram (Base Unit_Main) --------------68
14.3. Schematic Diagram (Base Unit_Operation) -------70
14.4. Schematic Diagram (Handset_Main) ----------------72
14.5. Schematic Diagram (Charger Unit) -----------------74
15 Printed Circuit Board-------------------------------------------75
15.1. Circuit Board (Base Unit_Main)-----------------------75
15.2. Circuit Board (Base Unit_Operation) ----------------77
15.3. Circuit Board (Handset_Main)-------------------------79
15.4. Circuit Board (Charger Unit) ---------------------------81
16 Exploded View and Replacement Parts List -----------82
16.1. Cabinet and Electrical Parts (Base Unit) -----------82
16.2. Cabinet and Electrical Parts (Handset) -------------83
16.3. Cabinet and Electrical Parts (Charger Unit)------- 84
16.4. Accessories------------------------------------------------ 85
16.5. Replacement Parts List--------------------------------- 86

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KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
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.
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
Risk of explosion if battery is replaced by an incorrect type. Dispose of used batteries according to the 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
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).
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
temperature 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).
Component
Component
pin
Solder
Remove all of the
excess solder
(Slice View)

5
KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
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
manufacturer's specific instructions for the melting points of their products and any precautions for using their product with other
materials.
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.
0.3 mm X 100 g 0.6 mm X 100 g 1.0 mm X 100 g

6
KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
3 Specifications
Note:
• Design and specifications are subject to change without notice.
Note for Service:
•Operation range: Up to 300 m outdoors, Up to 50 m indoors, depending on the condition.
•Analog telephone connection: Telephone Line
Power source
Receiving Method
Oscillation Method
Detecting Method
Tolerance of OSC Frequency
Modulation Method
ID Code
Ringer Equivalence No. (REN)
Dialing Mode
Redial
Speed Dialer
Power Consumption
Operating Conditions
Dimensions (H x W x D)
Mass (Weight)
AC Adaptor
(PNLV226Z, 120 V AC, 60 Hz)
Super Heterodyne
PLL synthesizer
Quadrature Discriminator
13.824 MHz ± 100 Hz
Frequency Modulation
40 bit
0.1B
Standby: Approx. 0.9 W
Maximum: Approx. 3.8 W
0 °C - 40 °C 20 % – 80 % relative
air humidity (dry)
Approx. 77 mm x 150 mm x 90 mm
Approx. 200 g
Rechargeable Ni-MH battery
AAA (R03) size (1.2 V 550 mAh)
Super Heterodyne
PLL synthesizer
Quadrature Discriminator
13.824 MHz ±100 Hz
Frequency Modulation
40 bit
Tone (DTMF)/Pulse
Up to 48 digits
Up to 24 digits (Phonebook)
11 days at Standby,
13 hours at Talk
0 °C - 40 °C 20 % – 80 % relative
air humidity (dry)
Approx. 159 mm x 49 mm x 29 mm
Approx. 130 g
Base Unit Handset Charger
AC Adaptor
(PNLV226Z, 120 V AC, 60 Hz)
Standby: Approx 0.1 W
Maximum: Approx 2.0 W
0 °C - 40 °C 20 % – 80 % relative
air humidity (dry)
Approx. 43 mm x 73 mm x 76 mm
Approx. 50 g
Duplex procedure:
TDMA (Time Division Multiple Access)
Channel spacing:
1.728kHz
Bit rate:
1.152 kbit/s
Modulation:
GFSK (Gaussian Frequency Shift Keying)
RF transmission power:
115 mW (max)
Voice coding:
ADPCM 32 kbit/s
Tone (DTMF)/Pulse
Up to 48 digits
■
■
■
■
■
■
■Standard:
DECT 6.0 (Digital Enhanced Cordless
Telecommunications 6.0)
■Number of channels:
60 Duplex Channels
■Frequency range:
1.92 GHz to 1.93 GHz

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KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
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
4.1.2. TDMA system
This system is the cycles of 10 ms, and has 6 duplex paths, but maximum duplex communication path is 5 because of dummy
bearer use.
In 1 slot 417 µs, the 10 ms of voice data is transmitted.
•2 - Handsets Link
Traffic Bearer
A link is established between base unit and handset.
The state where duplex communication is performed.
Handset doesn't make up duplex in no free RF channels because of interference. (*1)
Dummy Bearer
Base unit sends Dummy-data to the all stand-by state handsets.
Handsets receive that data for synchronization and monitoring request from the base unit.
Base unit doesn't send Dummy bearer in no free RF channels because of interference. (*1)
Note:
(*1) It is a feature under FCC 15 regulation and for interference avoidance.
In the case of checking RF parts, it is better in least interference condition.
417 µs (available) 417 µs (blind)
5 ms 5 ms
Up Link ( Handset ->Base Unit ) Down Link ( Base Unit ->Handset )
DATA rate : 1.152 Mbps
RX1 RX2 RX3 RX4 RX5 RX6 TX1 TX2 TX3 TX4 TX5 TX6
RX1 RX2 RX3 RX4 RX5 RX6 TX1 TX2 TX3 TX4 TX5 TX6
TX RX
RXTX
Traffic Bearer Dummy bearer
Base unit
Handset 1
(Stand by)
Handset 2
(Link)
Handset 3
(Link)

8
KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
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.
Handset:
As for a handset RF, RF signal is received in one antenna.
BBIC down-converts to 864 kHz IF signal from RX signal and demodulates it to digital data "RXDATA".
BBIC (IC1) converts RXDATA into a voice signal and outputs it to speaker.
Transmission
Handset:
A voice signal from microphone is encoded to digital data and converted into a 1.9GHz modulated radio signal by BBIC(IC1).
The RF signal, after which is amplified in BBIC, is fed to an antenna.
Base unit:
As for a base unit RF, RF signal is received in two antennas.
BBIC (IC501) compares RF signal levels and selects the antenna to be used. Then BBIC down-converts to 864 kHz IF signal
from RX signal in the selected antenna, and demodulates it to digital data "RXDATA".
BBIC (IC501) converts RXDATA into a voice signal and outputs it to TEL line.

9
KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
4.2. Block Diagram (Base Unit_Main)
Operational P.C. Board
D101
CHARGE_CONTAC
T
+
-
SP
X501
13.824 MHz
ANT2ANT1
TEL JACK
L1T L1R DCP DCM
DC JACK
RLY
SIDE TONE CIRCUIT
Q161
Q141
BELL DETECT
HOOK
BELL
Q111
LIN
LOUT
RF_PART
HSMIP
HSMIN
IC501
BBIC
INUSE DETECT 2
INUSE DETECT 1
RECEIVE AMP
DCIN 1 DCIN 2
IC302
VCCPA
VBAT_APU
VBAT
VCC_FE
VCC_IF
VCC_VCO
PDN DET
3.0V
DOUBOUT
SCL, SDA
WP
VDD
ANS_LED
BL1
IC601
FLASH MEMORY
IC611
EEPROM MEMORY
KEYS LCD R151,R152 R131, R133
Q171
VBAT
DL,CS
MSG_LED
BL2
KEY 1 6
KEY A~E
SPOUTN
SPOUTP
CS,CD,SID
SCL,RST
3.0 V REGULATOR
CLK,DO
STM/CKM
R371 R372
VCCA
VCC
KX-TG4131/4132/4133 BLOCK DIAGRAM (Base Unit_Main)
ANT2 ANT1 RXp RXn RXON TXp TXn TXON
RESET
RSTN

10
KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
4.3. Block Diagram (Base Unit_RF Part)
KX-TG4131/4132/4133 BLOCK DIAGRAM (Base Unit_RF Part)
DA801
ANT2
ANT1
TXON
RXON
RXp
RXn
ANT2
ANT1
TXp
TXn

11
KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
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.
4.4.1. BBIC (Base Band IC: IC501)
•Voice Message Recording/Play back
The BBIC system uses a proprietary speech compression technique to record and store voice message in Flash Memory.
An error correction algorithm is used to enable playback of these messages from the Flash Memory.
•DTMF Generator
When the DTMF data from the handset is received, the DTMF signal is output.
•Synthesized Voice (Pre-recorded message)
The BBIC implements synthesized Voice, utilizing the built in speech detector and a Flash Memory, which stored the vocabulary.
•Caller ID demodulation
The BBIC implements monitor and demodulate the FSK/DTMF 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
Telephone line, etc. They are determined by the signal path route operation of voice signal.
•Block Interface Circuit
RF part, LED, Key scan, Speaker, Telephone line.
4.4.2. Flash Memory (IC601)
Following information data is stored.
•Voice signal
ex: Pre-recorded Greeting message, Incoming message
4.4.3. EEPROM (IC611)
Following information data is stored.
•Settings
ex: message numbers, ID code, Flash Time, Tone/Pulse
RF part
ADPCM
Analog
Front
End
&
Multi-
plexer
TEL
Line
Interface
Digital
Speech
Processor
Caller ID
Modem
Digital TAM System
Flash Memory IC601
Host CPU
BBIC (IC501)
DECT RF system
TDMA/TDD
Mod/Demod
PA/LNA ADPCM
Keys/ LEDs/ ChargeEEPROM IC611

12
KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
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:
5.5V
VBAT
RSTN(Reset)
pin 54
VBAT
pin 10
pin 57
pin 9
pin 15
IC501
IC302 IC601
BBIC
DOUBLER OUT
For peripherals
VDDC (1.2V)
AC Adaptor 3.0V
REGULATOR
FLASH
IC611
EEPROM
+3.0V
STM/CKM
Receive
Amp.
RF Part
LCD BLT
ANS LED
MSG LED
SP LED
Startmonitor
(IC501 57pin)
VDDC (1.2 V)
VBAT
Reset (RSTN)
(IC501_54 pin)
BBIC chip initialize
(CKM/STM)

13
KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
4.4.4.1. Charge Circuit
The voltage from the AC adaptor is supplied to the charge circuits.
D362 R372 R371
D361
CHARGE+
F301 DCP
+
CHARGE-
( )
C306
+5.5V
DCM

14
KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
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 →L101 →R111 →C111 →Q111 →BBIC pin 59
When the CPU (BBIC) 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 6 of BBIC 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 BBIC.
3.0V
RX
Pin 16 of IC501
R176
R175
R178 C178 C175
Q171
R172
R171
+
Hook
Pin 6 of IC501
Pin 28 of IC501
Pin 59 of IC501
TX
BELL
C173
R165
C167
R163R167
C161 C142
D143
C168
C181
R160
R162
R145
R164
Q161
C163
R161
Q142
Q141
R142
R141
R181 C184
C101
C102
D101 L101
L102 P101
SA101
L1T
L1R
TEL JACK
3.0V
R114
R111C111C113
D113
C112 R112
R113
Q111
3
4
2
1
C176
C165
( )
C164
( )
( )
( )

15
KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
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.
Circuit Operation:
Parallel connection detection when on hook:
When on hook, the voltage is monitored at pin 17 of IC501. There is no parallel connection if the voltage is
0.54 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 18 of IC501; the presence/absence of a parallel connection is determined by
detecting the voltage changes.
If the Auto disconnect function is ON and statuses are Hold, receiving ICM, OGM transmitting, BBIC disconnects the line after
detecting parallel connection is off hook.
Q141
Q161
R141
R142
RA151
R131R133
Q142
R151
R145
C132
Pin 17 of IC501
DCIN1
Pin 18 of IC501
DCIN2
HOOK
Pin 6 of IC501
C101
D101
C102
L101
L102
SA101
P101
TEL JACK
3
4
2
1
R163R167
L1T
L1R
R152
C152
RA151

16
KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
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. 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
format 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.
1st Ring
2 sec Silent interval 4 sec
2nd Ring
2 sec
0.5 s 575 ms min 0.5 s
DATA
0.1 Vrms
STD Ring / 20 Hz
Tip-Ring
DATA in
A
BDATA out
1200 Hz
=DATA "1"
1 bit=833 µs
2200 Hz
=DATA "0 "
70 Vrms
month day hour minute number
201348700035161504
Single message format
Plural message format
1st Ring
2 sec
718 ms
2nd Ring
0.5 s
DATA
month day hour minute number
20134870003516 16
DATA CODE NAME
201 John Smith 04

17
KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
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.
Function:
The telephone exchange transmits or receives CAS and ACK signals through each voice RX/TX route. Then FSK data and
MARK data pass the following route.
Telephone Line →P101 →L101, L102 →C121, C122 →R121, R122 →IC501 (25, 24).
If the unit deems that a telephone connected in parallel is in use, ACK is not returned even if CAS is received, and the
information for the second and subsequent callers is not displayed on the portable handset display.
CAS
CAS: CPE Alerting Signal
Dual Tone of 2130 Hz, 2750 Hz
-15 dBm (900 ohm load)
80 5 ms
MARK DATA
0~500 ms 58~75 ms about 300 ms
(be changed by
Information Volume)
Continuance Signal
of 1200 Hz (Data "1") "FSK"
ACK: Acknowledged Signal
DTMF
"D"
ACK
0~100 ms 60 5 ms
Telephone Exchange Cordlessphone
Cordlessphone
Signal Flow
Signal Flow
Telephone Exchange
Call Waiting Format
L101
C121
R121
C122 L102
P101
L1T
L1R
SA101
R122
C120
25
24
BBIC
IC501
"FSK"
data
Telephone
Line

18
KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
4.5. Block Diagram (Handset)
IC1
IC3
MIP
MIN
HSSPOUTP
LOUT
BELL_LED
SPOUTP
SPOUTN
CKM//STM
CKM/STM
BBIC
RESET
CHG_CTL
CHG_DET
WP, CLK, DATA
KEYSTOROBE_A~E
KEYIN_1~5
CHARGE Q4 D7
MIC
Receiver
LED
Monitor SP
LCD KEYS
RF part
ANT1
X1
13.824 MHz
EEPROM
VBAT
BATTERY
Q5
RSTN
(BELL)
VBAT
VBAT
3V4.0V
VBAT 4.0V
IC4
RXn
RXp
RXON
TXp
TXn
TXON
KX-TGA410 BLOCK DIAGRAM (Handset)
KEY_LED
Q6
LED
(KEY/LCD)

19
KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
4.6. Block Diagram (Handset_RF Part)
KX-TGA410 BLOCK DIAGRAM (Handset_RF Part)
DA801
TXON
RXON
RXp
RXn
ANT
TXp
TXn

20
KX-TG4131MEB/KX-TG4132MEB/KX-TG4133MEB/KX-TGA410MEB
4.7. Circuit Operation (Handset)
4.7.1. Outline
Handset consists of the following ICs as shown in Block Diagram (Handset) (P.18).
• DECT BBIC (Base Band IC): IC1
- All data signals (forming/analyzing ACK or CMD signal)
- All interfaces (ex: Key, Detector Circuit, Charge, EEPROM, LCD)
• EEPROM: IC3
- Setting data is stored. (e.g. ID, user setting)
4.7.2. Power Supply Circuit/Reset Circuit
Circuit Operation:
When power on the Handset, the voltage is as follows;
BATTERY(2.2 V ~ 2.6 V: BATT+) →F1 →BBC1 (IC1) 10 pin
The Reset signal generates IC1 (54 pin) and 1.8 V.
Startmonitor
(IC1 57pin)
VDDC (1.2 V)
VBAT
Reset (RSTN)
(IC1_54 pin)
BBIC chip initialize
(CKM/STM)
GND
BATTERY
2CELL
BBIC
3.0V
3.0V
DOUBLER OUT (Charge Pump)
For all peripherals
4.0V
3.0V3.0V
EEPROM
GND
BELL LED
KEY LED
LCD BL
3.0V
GHD
4.0V
VBAT IC4
VDDC (1.2V)
3.0V3.0V
LCD