Panasonic KX-TG9471B User manual

© Panasonic System Networks Co., Ltd. 2011
Unauthorized copying and distribution is a
violation of law.
ORDER NO. KM41108472CE
F13
Telephone Equipment
Model No. KX-TG9471B
KX-TG9472B
KX-TGA939T
Digital Corded/Cordless Answering System
B: Black Version
(for U.S.A.)
KX-TGA939T
(Portable)
KX-TG9471B
(Base Unit)
Configuration for each model
KX-TGA939 is also an optional accessory, which contains a portable
and a charger.
*
Model No Base Unit Portable Charger Unit Expandable
KX-TG9471 1 (TG9471) 1 (TGA939) 1 Up to 6
KX-TGA939* 1 (TGA939) 1
KX-TG9472 1 (TG9471) 2 (TGA939) 2 Up to 6
Caller ID Compatible
(Charger Unit)

2
KX-TG9471B/KX-TG9472B/KX-TGA939T
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.
Trademarks:
LWhen you note the serial number, write down all 11 digits. The serial number may be found on the bottom of the unit.
LMicrosoft, Windows, Windows Vista, and Outlook are either registered trademarks or trademarks of Microsoft Corporation
in the United States and/or other countries.
LIntel, Celeron and Pentium are trademarks of Intel Corporation in the U.S. and other countries.
LAll other trademarks identified herein are the property of their respective owners.
LMicrosoft product screen shots reprinted with permission from Microsoft Corporation.
LThe illustrations in this Service Manual may vary slightly from the actual product.

3
KX-TG9471B/KX-TG9472B/KX-TGA939T
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. Block Diagram (Base Unit) ------------------------------ 7
4.2. Circuit Operation (Base Unit)--------------------------- 8
4.3. Block Diagram (Portable)-------------------------------11
4.4. Circuit Operation (Portable)----------------------------12
4.5. Circuit Operation (Charger Unit) ----------------------13
4.6. Signal Route -----------------------------------------------14
5 Location of Controls and Components ------------------18
6 Installation Instructions ---------------------------------------18
7 Operating Instructions-----------------------------------------18
7.1. Registering a Portable to the Base Unit ------------18
7.2. Copying Phonebook Entries ---------------------------19
8 Service Mode -----------------------------------------------------20
8.1. Engineering Mode ----------------------------------------20
8.2. Copying Phonebook Items when Repairing -------24
8.3. How to Clear User Setting------------------------------26
9 Troubleshooting Guide ----------------------------------------27
9.1. Troubleshooting Flowchart -----------------------------27
9.2. Troubleshooting by Symptom (Base Unit and
Charger Unit) ----------------------------------------------40
9.3. Troubleshooting by Symptom (Portable) -----------44
10 Disassembly and Assembly Instructions ---------------48
10.1. Disassembly Instructions -------------------------------48
10.2. Assembly Instructions -----------------------------------53
11 Measurements and Adjustments---------------------------56
11.1. Equipment Required -------------------------------------56
11.2. The Setting Method of JIG -----------------------------56
11.3. Adjustment Standard (Base Unit)---------------------58
11.4. Adjustment Standard (Charger Unit)-----------------59
11.5. The Setting Method of JIG (Portable) ---------------60
11.6. Adjustment Standard (Portable) ----------------------62
11.7. Things to Do after Replacing IC or X'tal ------------63
11.8. RF Specification-------------------------------------------69
11.9. How to Check the Portable Speaker or
Receiver ----------------------------------------------------70
11.10. Frequency Table (MHz) ---------------------------------70
12 Miscellaneous ----------------------------------------------------71
12.1. How to Replace the Flat Package IC ----------------71
12.2. How to Replace the LLP (Leadless Leadframe
Package) IC------------------------------------------------73
12.3. Terminal Guide of the ICs, Transistors and
Diodes -------------------------------------------------------75
13 Schematic Diagram ---------------------------------------------76
13.1. For Schematic Diagram---------------------------------76
13.2. Schematic Diagram (Base Unit_Main) --------------78
13.3. Schematic Diagram (Base Unit_Operation) -------82
13.4. Schematic Diagram (Base Unit_LCD)---------------83
13.5. Schematic Diagram (Base Unit_LED)---------------84
13.6. Schematic Diagram (Portable) ------------------------86
13.7. Schematic Diagram (Charger Unit) ------------------88
14 Printed Circuit Board-------------------------------------------89
14.1. Circuit Board (Base Unit_Main) ---------------------- 89
14.2. Circuit Board (Base Unit_Operation)---------------- 91
14.3. Circuit Board (Base Unit_LCD)----------------------- 93
14.4. Circuit Board (Base Unit_LED) ----------------------- 94
14.5. Circuit Board (Portable) -------------------------------- 95
14.6. Circuit Board (Charger Unit)--------------------------- 97
15 Exploded View and Replacement Parts List ----------- 98
15.1. Cabinet and Electrical Parts (Base Unit) ----------- 98
15.2. Cabinet and Electrical Parts (Portable)------------- 99
15.3. Cabinet and Electrical Parts (Charger Unit) ----- 100
15.4. Accessories and Packing Materials --------------- 101
15.5. Replacement Parts List------------------------------- 104

4
KX-TG9471B/KX-TG9472B/KX-TGA939T
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.
Attention:
A nickel metal hydride battery that is recyclable powers the product you have purchased.
Please call 1-800-8-BATTERY (1-800-822-8837) for information on how to recycle this battery.
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-TG9471B/KX-TG9472B/KX-TGA939T
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-TG9471B/KX-TG9472B/KX-TGA939T
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
• Optional headset: KX-TCA60, KX-TCA93, KX-TCA94, KX-TCA400, KX-TCA430
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
(PQLV219Y , 120 V AC, 60 Hz)
Super Heterodyne
PLL synthesizer
Quadrature Discriminator
10.368 MHz ±100 Hz
Frequency Modulation
40 bit
0.1B
Tone (DTMF)/Pulse
Up to 48 digits
Up to 24 digits (Phonebook)
Standby: Approx. 1.2 W
Maximum: Approx. 2.7 W
0 °C - 40 °C (32 °F – 104 °F),
20 % – 80 % relative air humidity
(dry)
Approx. 185mm x 223 mm x 128 mm
Approx. 690 g
Rechargeable Ni-MH battery
AAA (R03) size (1.2 V 630 mAh)
Super Heterodyne
PLL synthesizer
Quadrature Discriminator
10.368 MHz ±100 Hz
Frequency Modulation
40 bit
Tone (DTMF)/Pulse
Up to 48 digits
Up to 24 digits (Phonebook)
11 days at Standby,
5 hours at Talk
0 °C - 40 °C (32 °F – 104 °F),
20 % – 80 % relative air humidity
(dry)
Approx. 156 mm x 49 mm x 32 mm
Approx. 130 g
Base Unit Portable Charger
AC Adaptor
(PQLV219Y, 120 V AC, 60 Hz)
Standby: Approx. 0.6 W,
Maximum: Approx. 3.6 W
0 °C - 40 °C (32 °F – 104 °F),
20 % – 80 % relative air humidity
(dry)
Approx. 51 mm x 75 mm x 88 mm
Approx. 60 g
Duplex procedure:
TDMA (Time Division Multiple Access)
Channel spacing:
1,728 kHz
Bit rate:
1,152 kbit/s
Modulation:
GFSK (Gaussian Frequency Shift Keying)
RF transmission power:
115 mW (max.)
Voice coding:
ADPCM 32 kbit/s
■
■
■
■
■
■
Interface:
USB 2.0 Full speed (12 Mbps)
■
■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

7
KX-TG9471B/KX-TG9472B/KX-TGA939T
4 Technical Descriptions
4.1. Block Diagram (Base Unit)
R/F i/f
RF UNIT
(PQLP10293ZA)
3V
2.5V
ANT1 ANT2
D601
ANT1
ANT2
KEY/LED
(separated PCB)
LCD i/f & Backlite power
supply
relay circuit
(separated PCB)
LCD module
(103x65 dots, B/W FSTN)
LCD Backlite (separated PCB)
3V
3V
4V
FLASH Memory 8Mbits
(program)
BUS AD1~AD15 D0~D15
Extended I/0
buffer1
Extended I/0
buffer2
IC561
IC631 IC641
FLASH MEMORY
16Mbits
(TAM)
EEPROM
(128kbits)
SPI bus (Extended I/O)
KEY in/out LED
I2C
IC761
TAM IC
IC701
MIC
SPEAKER
PCM i/f
USB to UART Bridge Chip
URX
UTX
Photo
coupler
Photo
coupler
IC551
IC901
IC902
SUSPEND
RESET
IC903
Photo
coupler
Photo
coupler
IC905
IC904
TXD
RXD
Mini USB Connector
PC
D+ D-
L2 out(TX)
L2 in(RX)
TP RX
TP TX
PC202 (optical isolator)
D+
D-
VBUS(5V)
Diode Bridge
Side Tone Circuit
Transformer
Transformer
+
-
T246
T241
Q231
Bell Detect
Caller ID Circuit
Diode Bridge
Side Tone Circuit
Transformer
Transformer
+
-
T146 T141
Q131
Bell Detect
Caller ID Circuit
L1out(TX)
L1in(RX)
LINE1
LINE2
L1 HooK
from IC641
L2 HooK
from IC 641
L1 CID
L1 Bell
L2 CID
L2 Bell
PC102
(
o
p
tical isolator
)
Isolated Area from Internal circuit
IC161
IC261
D101
D201
/RESET
/SUSPEND
4V regulator
DC6.5V 500mA
F301,3A
3V
3.31.8
3.3V regulator
2.5V regulator
For RF only
For TAM IC only (Audio Power)
For Source of BBIC LDO (3.0V,1.8V) LCD backlite LED(white)
1.8V
4V
3V
1.8V
LDO1 CTRL
LDO2 CTRL
Q381
Q386
IC341
IC321 IC331
4V
Handset Mic
Handset Speaker
Reset IC
Q541
Reset
3.3V
Reset
Key
Interface
L1 Hook L2 Hook
LCD I/F
LED
Reset
IC501
DSP IC
VBUS-GND
~
~
~
~
+
KX-T9471/9472 BLOCK DIAGRAM (Base Unit_Main)

8
KX-TG9471B/KX-TG9472B/KX-TGA939T
4.2. Circuit Operation (Base Unit)
4.2.1. Outline
Base unit consists of the following ICs as shown in Block Diagram (Base Unit) (P.7).
• DECT BBIC (Base Band IC): IC501
- Handling all the audio, signal and data processing needed in a US DECT base unit
- Controlling the US DECT specific physical layer and radio section (Burst Module Controller section)
- ADPCM code filter for speech encoding and speech decoding (DSP section)
- Echo-cancellation and Echo-suppression (DSP section)
- Any tones (tone, sidetone, ringing tone, etc.) generation (DSP section)
- DTMF receiver (DSP section)
- Clock Generation for RF Module
- ADC, DAC, timer, and power control circuitry
- All interfaces (ex: RF module, EEPROM, LED, Analog Front End, etc.)
• RF Module: IC801
- PLL Oscillator
-Detector
- Compress/Expander
- First Mixer
- Amplifier for transmission and reception
• EEPROM: IC551
- Temporary operating parameters (for RF, etc.)
• FLASH MEMORY 1: IC761
- Voice Prompt (TAM) D/L Area
- ICM/OGM/MEMO Recording Area
• TAM Companion: IC701
- Voice data compression and decompression
- Speaker Amp
- Handset MIC Amp
- Handset Receiver Amp
• Additionally,
- Power Supply Circuit (+4.0 V, +3.3 V, 3.0V, +2.5 V, +1.8 V output)
- Crystal Circuit (10.368 MHz)
- Telephone Line Interface Circuit
• FLASH MEMORY 2: IC561
- Program DL
• LED Driver: IC641, IC701
• LCD Driver: IC641, IC601
• Key Matrix: IC631, IC501
•USB
- USB to UART Bridge Controller: IC901
- Photocoupler: IC902, IC903, IC904, IC905

9
KX-TG9471B/KX-TG9472B/KX-TGA939T
4.2.2. Power Supply Circuit
The power is supplied to the DECT BBIC, RF Module, EEPROM, TAM Companion, OP Amp, and Charge Contact from AC
Adaptor (+6.5 V) as shown in Fig.101. The power supply is as follows;
• DECT BBIC (IC501):
CN301 (+6.5 V) →F301 →IC341 →IC326 →Q386 →IC501
CN301 (+6.5 V) →F301 →IC341→IC326 →Q381 →IC501
• RF Module (IC801):
CN301 (+6.5 V) →F301 →IC321→IC801 (PLL) (Power AMP)
• EEPROM (IC551)/FLASH MEMORY 1 (IC761)/FLASH MEMORY 2 (IC561)/Latch (IC631/641)/OP Amp (IC171):
CN301 (+6.5 V) →F301 →IC341 →Q381 →IC761, IC561, IC171, IC631, IC641, IC551
• TAM Companion (IC701):
CN301 (+6.5 V) →F301 →IC331 →IC701
CN301 (+6.5 V) →F301 →IC341 →Q386 →IC701
CN301 (+6.5 V) →F301 →IC341 →Q381 →IC701
• OP Amp (IC161, IC261):
CN301 (+6.5 V) →F301 →Q386 →IC161/IC261
<Fig.101>
AC Adaptor
IC321 RF Module (IC801)
IC341
USB
VBUS
IC331
+5.0V
CN901
USB JACK
Isolated circuit
Photocoupler
IC902
IC903
IC904
IC905
+2.5 V
+4.0V
Q386
Q381
Q541
Reset
IC161, IC261
BBIC (IC501)
IC561
IC902
IC903
IC904
IC905
TAM IC (IC701)
CN301
+6.5 V
+3.0 V
+3.3V
+1.8 V
IC761, IC551, IC631,
IC641, IC171
F301

10
KX-TG9471B/KX-TG9472B/KX-TGA939T
4.2.3. Telephone Line Interface
Note:
[ ]: Line 2
<Function>
• Bell signal detection
• Clip signal detection
• ON/OFF hook circuit
Bell & Clip (: Calling Line Identification Presentation: Caller ID) signal detection:
In the standby mode, Q101 [Q201] is open to cut the DC loop current and decrease the ring load.
When ring voltage appears at the L1T (A) [L2T (C)] and L1R (B) [L2R (D)] leads (when the telephone rings), the AC ring voltage
is transferred as follows;
ON/OFF hook circuit:
In the standby mode, Q101 [Q201] is open, and connected as to cut the DC loop current and to cut the voice signal. The unit is
consequently in an on-hook condition.
When IC501 detects a ring signal or press the TALK Key onto the portable, Q103 [Q203] turns on and then Q101, PC102,
[Q201, PC202] turns on, thus providing an off-hook condition (DC current flows through the circuit) and the following signal
flow makes the loop current.
A [C] →D101 [D201] →Q101 [Q201] →Q131 [Q231] →R124 [R224] →R125 [R225] →D101 [D201] →B [D]
4.2.4. Transmitter/Receiver
• Audio Circuits and DTMF tone signal circuits.
Base unit and portable mainly consist of RF Module and DECT BBIC.
Base unit and portable transmit/receive voice signal and data signal through the antenna on carrier frequency.
Signal Path:
*Refer to Signal Route (P.14).
4.2.4.1. Transmitter Block
The voice signal input from the TEL LINE interface goes to RF Module (IC801) through DECT BBIC (IC501) as shown in Block
Diagram (Base Unit) (P.7)
The voice signal passes through the analog part of IC501 where it is amplified and converted to a digital audio stream signal.
The burst switch controller processes this stream performing encryption and scrambling, adding the various other fields to
produce the GAP (Generic Access Profile) standard DECT frame, assigning to a time slot and channel etc.
In IC801, the carrier frequency is changing, and frequency modulated RF signal is generated and amplified, and radiated from
antenna. Portable detects the voice signal or data signal in the circuit same as the following explanation of Receiver Block.
4.2.4.2. Receiver Block
The signal of 1900 MHz band (1920 MHz ~ 1930 MHz) which is input from antenna is input to IC801 as shown in Block
Diagram (Base Unit) (P.7).
In IC801, the signal of 1900 MHz band is downconverted to 864 kHz signal and demodulated, and goes to IC501 as GAP
(Generic Access Profile) standard DECT frames. It passes through the decoding section burst switch controller where it
separates out the frame information and performs de-encryption and de-scrambling as required. It then goes to the DSP section
where it is turned back into analog audio. This is amplified by the analog front end, and goes to the TEL LINE Interface.
4.2.5. USB Interface
IC901 includes a USB2.0 full-speed function controller, USB transceiver, oscillator, one-time programmable ROM, and
asynchronousserial data bus (UART) with full modem control signals. USB and UART is bridged by IC901.
R167 [R268] - IC501 (101) [IC501 (114)]
R171 [R271] - R172 [R272] - IC171 (2) [IC171 (6)] - IC171 (1) [IC171 (7)] - IC501 (11) [IC501 (12)]
A [C] - C153 [C253] - R153 [R253] - IC161 (6) [IC261 (6)] IC161 (7) [IC261 (7)] -
B [D] - C158 [C258] - R156 [R256] - IC161 (5) [IC261 (5)]
Bell
Clip

11
KX-TG9471B/KX-TG9472B/KX-TGA939T
4.3. Block Diagram (Portable)
SPEAKER
RECEIVER
MIC
CHARGE CIRCUIT Q4, Q9, R7
Q4, Q9, R7
CHARGE CONTACTS
CHARGE(+) CHARGE(-)
CHARGE HANDSET-DET
CHARGE DETECT
EEPROM SCL
SDA
BATTERY TERMINAL
D7
VBAT
J1
J2
1.8 V
Q2
Q2
1.8 V
LCD
CD
RESET
CSB SDA
SCL
CPU
Analog
Front
End
D/A A/D
33 35
15 16
19 20 18 20
31 32 57 58
WP 53
36 40
13
43 42
63 54 55 66
ADPCM
Codec
Filter
DSP
Speech
Decoding
Speech
Encoding
BMC
Burst
Decoding
RF PA
IC801
Burst
Encoding
RF
PLL
MOD/DEMOD
ANT1 ANT2
5 3
4 3 6 78
9
6
2
77 78
75
RXn
RXon
D802
ANT1
D801
RXp
TXp TXn Pon PSEL TXoh
VDD-PADRY
9
10
XTAL
X1
10.368 MHz
BATTERY
44
TALK OFF
KEYPAD
Charge
Pump
ROWS
COLUMNS
CP2.5V CP4.0V
27, 49, 50, 51
22, 23, 24, 25, 26
BBIC
IC1
IC3
56
LCD-BACK LIGHT
KEY LED BELL LED
65 52 68
KX-TGA939 BLOCK DIAGRAM
(
PORTABLE
)
73 74 80
72
ANT2
ANT2
1 2 3 4 5

12
KX-TG9471B/KX-TG9472B/KX-TGA939T
4.4. Circuit Operation (Portable)
4.4.1. Outline
Portable consists of the following ICs as shown in Block Diagram (Portable) (P.11).
• 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 Power Amp.)
- PLL Oscillator
-Detector
- Compress/Expander
- Reception
• RF Power Amp: IC801
- Amplifier for transmission
• EEPROM: IC3
- Temporary operating parameters (for RF, etc.)
4.4.2. Power Supply Circuit/Reset Circuit
Circuit Operation:
When power on the Portable, the voltage is as follows;
BATTERY(2.2 V ~ 2.6 V: BATT+) →F1 →Q2 (1.8 V), IC1-43pin (2.5V)
The Reset signal generates IC1 (61 pin) and 1.8 V.
4.4.3. Charge Circuit
Circuit Operation:
When charging the portable on the Base Unit, the charge current is as follows;
DC+(6.5 V) →R57 →D22 →R56 →R55 →CHARGE+(Base) →CHARGE+(Portable) →L4 →Q4 →D7→F1 →
BATTERY+... Battery...
BATTERY- →L8 →R45 →GND →L5 →CHARGE-(Portable)→CHARGE-(Base) →GND →DC-(GND)
In this way, the BBIC on Portable detects the fact that the battery is charged.
The charge current is controlled by switching Q9 of Portable.
Refer to Fig.101 in Power Supply Circuit (P.9).
4.4.4. Battery Low/Power Down Detector
Circuit Operation:
“Battery Low” and “Power Down” are detected by BBIC which check the voltage from battery.
The detected voltage is as follows;
• Battery Low
Battery voltage: V(Batt) 2.25 V ± 50 mV
The BBIC detects this level and " " starts flashing.
• Power Down
Battery voltage: V(Batt) 2.0 V ± 50 mV
The BBIC detects this level and power down.
4.4.5. Speakerphone
The hands-free loudspeaker at SP+ and SP- is used to generate the ring alarm.
1.8 V
Reset
(IC1_61pin)
Battery +

13
KX-TG9471B/KX-TG9472B/KX-TGA939T
4.5. Circuit Operation (Charger Unit)
4.5.1. Power Supply Circuit
The power supply is as shown.
R1
TP1
TP2
J1
AC Adaptor
D1

14
KX-TG9471B/KX-TG9472B/KX-TGA939T
4.6. Signal Route
SIGNAL ROUTE ROUTE
IN OUT
SIGNAL
DTMF TONE
TEL OUT
(to Tel Line)
CDL TX
(to Tel Line)
CDL RX
(from Tel Line)
(PORTABLE)
MIC(+) - L10 - C11 - RA4 - IC1(20) IC1(77) - IC801(4)
MIC(- ) - L11- C13- RA4- IC1(19) IC1(78) - IC801(3)
DTMF TONE
TEL IN
(from Tel Line)
B
(BASE UNIT)
Line 1
A
D101 - Q101 - R121 - C121 - R141 - T141 (1) - T141 (3) - C143 - R120 - IC501 (102)
D
Line 2
C
D201 - Q201 - R221 - C221 - R241 -T241 (1) - T241 (3) - C243 - R428 - IC501 (118)
B
(BASE UNIT)
Line 1
A
D101 - Q101 - R121 - C121 - R141- T141 (1) - T141 (3) - C143 - R120 - IC501 (102)
D
Line 2
C
D201 - Q201 - R221 - C221 - R241 -T241 (1) - T241 (3)
- C243 - R428 - IC501 (118)
(BASE UNIT)
from PORTABLE ANT1 - L850 - R811 - C802 D801 - C809 - IC801 (31) - IC801 (16) - IC501 (26) -
ANT2 R812 - C803
IC501 (28) - R806 - IC801 (18) IC801(21) - R809 - C803 - R812 - ANT2 to PORTABLE
IC801(2) - R801 - C802 - R811 - ANT1 to PORTABLE
(PORTABLE)
from BASE UNIT ANT1 - L850 DA1 - C803 - C801 - D802 - C826 C832 - IC1(3)
ANT2 C833 - IC1(2)
IC1 (15) - RECEIVER (-)
(BASE UNIT)
Line 1
IC501 (100) - R177 - C146 - T146 (3) - T146 (4) - R128 - C128 - Q131 - Q101 - D101 A
B
B
Line 2
IC501 (110) - R277 - C246 - T246 (3) - T246 (4) - R228 - C228 - Q231 - Q201 - D201 C
Line 1
IC501 (100) - R177 - C146 - T146 (3) - T146 (4) - R128 - C128 - Q131 - Q101 - D101 A
Line 2
IC501 (110) - R277 - C246 - T246 (3) - T246 (4) - R228 - C228 - Q231 - Q201 - D201 C
D
D
IC801(2) - R801 - C802 - R811 - L805 - ANT1 to PORTABLE
R167 [R268] - IC501 (101) [IC501 (114)] - IC501 (28) -
IC801 (18) IC801(21) - R809 - C803 - R812 - ANT2 to PORTABLE
Caller ID
(from Tel Line)
(BASE UNIT) [ ]: Line 2
A [C] - C153 [C253] - R153 [R253] - IC161 (6) [IC261 (6)] IC161 (7) [IC261 (7)] -
B [D] - C158 [C258] - R156 [R256] - IC161 (5) [IC261 (5)]
L804 - C812 - D801 - C801 - C803 - DA1 R107 - ANT1 to BASE UNIT
R108 - ANT2 to BASE UNIT
IC1 (23) IC1 (16) - L9 - RECEIVER (+)
IC801(9) - L802 -

15
KX-TG9471B/KX-TG9472B/KX-TGA939T
SIGNAL ROUTE ROUTE
IN OUT
SIGNAL
(PORTABLE)
from BASE UNIT - ANT1 - R107 DA1
- C803 - C801 - D802 - C826 C832 - IC1(3) IC1(33) - SP(+)
ANT2 - R108
C833 - IC1(2) IC1(35) - SP(-)
Base Unit
SP-PHONE TX
(to Tel Line)
Base Unit
SP-PHONE RX
(from Tel Line)
Portable
SP-PHONE TX
(to Tel Line)
Portable
SP-PHONE RX
(from Tel Line)
(BASE UNIT)
MIC (+) - R722 - C728 - R728 - IC701 (28) IC701 (10) - IC501 (79) -
MIC (-) - R721 - GND
IC501 (94) - IC701 (9) IC701 (16) - L746 - L742 - SP (-)
IC701 (14) - L745 - L741 - SP (+)
(BASE UNIT)
(PORTABLE)
MIC(+) - L10 - C11 - RA4 - IC1(20) IC1(77) - IC801(4)
MIC(- ) - L11- C13- RA4- IC1(19) IC1(78) - IC801(3)
(BASE UNIT)
from PORTABLE ANT1 - R812 - C803 D801 - C809 - IC801 (31) - IC801 (16) - IC501 (26) -
ANT2 - R811 - C802
L804 - C812 - D801 - C801 - C803 - DA1 R107 - ANT1 to BASE UNIT
R108 - ANT2 to BASE UNIT
IC801(9) - L802 -
IC801(2) - R801 - C802 - R811 - ANT1 to PORTABLE
- IC501 (28) - IC801 (18) IC801(21) - R809 - C803 - R812 - ANT2 to PORTABLE
(BASE UNIT) [ ]: Line 2
Line 2
IC501 (110) - R277 - C246 - T246 (3) - T246 (4) - R228 - C228 - Q231 - Q201 - D201 C
D
Line 1
IC501 (100) - R177 - C146 - T146 (3) - T146 (4) - R128 - C128 - Q131 - Q101 - D101 A
B
B
Line 1
A
D101 - Q101 - R121 - C121 - R141 - T141 (1) - T141 (3) - C143 - R120 - IC501 (102)
D
Line 2
C
D201 - Q201 - R221 - C221 - R241 -T241 (1) - T241 (3) - C243 - R428 - IC501 (118)
Line 1
IC501 (100) - R177 - C146 - T146 (3) - T146 (4) - R128 - C128 - Q131 - Q101 - D101 A
B
Line 2
IC501 (110) - R277 - C246 - T246 (3) - T246 (4) - R228 - C228 - Q231 - Q201 - D201 C
D
B
Line 1
A
D101 - Q101 - R121 - C121 - R141 - T141 (1) - T141 (3) - C143 - R120 - IC501 (102)
D
Line 2
C
D201 - Q201 - R221 - C221 - R241 -T241 (1) - T241 (3) - C243 - R428 - IC501 (118)

16
KX-TG9471B/KX-TG9472B/KX-TGA939T
SIGNAL ROUTE ROUTE
IN OUT
SIGNAL
Memo/OGM
Recording
(from Portable)
ICM Recording
(from Tel Line)
(BASE UNIT)
from PORTABLE ANT1 - L805 - R812 - C803 D801 - C809 - IC801 (31) - IC801 (16) -
IC501 (26) - IC501 (94) - IC761 (5)
ANT2 - R811 - L802
OGM Rec
(from Base Unit)
(BASE UNIT)
MIC - R722 - C728 - R728 - IC701 (28) IC701 (10) - IC501 (79) - IC501 (94) - IC761 (5)
MIC - R721 - GND
Message Play
(to Portable)
(BASE UNIT)
IC761 (2) - IC501 (79) - IC501 (28) - R806 -
IC801 (18) IC801(2) - R801 - C802 - R811 - L805 - ANT1 to PORTABLE
IC801(21) - R809 - C803 - C812 - ANT2 to PORTABLE
Message Play
(to Base Unit)
(BASE UNIT)
IC761 (2) - IC501 (79) - IC501 (94) - IC701 (9) IC701 (16) - L746 - L742 - SP (-)
IC701 (14) - L745 - L741 - SP (+)
(PORTABLE)
from BASE UNIT - ANTENNA - C66 - IC4 (31) - IC4 (16) - IC1 (23) IC1 (32) - SP (+)
IC1 (30) - SP (-)
Message Play
(to Tel Line)
+
-
(BASE UNIT)
(BASE UNIT)
IC701 (2) - IC501 (79)
(PORTABLE)
MIC(+) - L10 - C11 - RA4 - IC1(20) IC1(77) - IC801(4)
MIC(- ) - L11- C13- RA4- IC1(19) IC1(78) - IC801(3)
L804 - C812 - D801 - C801 - C803 - DA1 R107 - ANT1 to BASE UNIT
R108 - ANT2 to BASE UNIT
IC801(9) - L802 -
Line 2
IC501 (110) - R277 - C246 - T246 (3) - T246 (4) - R228 - C228 - Q231 - Q201 - D201 C
D
Line 1
IC501 (100) - R177 - C146 - T146 (3) - T146 (4) - R128 - C128 - Q131 - Q101 - D101 A
B
B
Line 1
A
D101 - Q101 - R121 - C121 - R141 - T141 (1) - T141 (3) - C143 - R120 - IC501 (102)
D
Line 2
C
D201 - Q201 - R221 - C221 - R241 -T241 (1) - T241 (3) - C243 - R428 - IC501 (118)

17
KX-TG9471B/KX-TG9472B/KX-TGA939T
USB
SIGNAL ROUTE ROUTE
IN OUT
SIGNAL
MIC (P)- L771- R771 - C771 - IC701 (31)
MIC (N)- L772 - R772 - C772 - IC701 (27)
(Corded) Handset
TX (to Tel Line)
(Corded) Handset
RX (from Tel Line)
+
-
- IC501 (94) - IC701 (9) IC701 (26) - C751 - R751 - L751 - SP (P)
IC701 (10) - IC501 (79)
Line 2
IC501 (110) - R277 - C246 - T246 (3) - T246 (4) - R228 - C228 - Q231 - Q201 - D201 C
D
Line 1
IC501 (100) - R177 - C146 - T146 (3) - T146 (4) - R128 - C128 - Q131 - Q101 - D101 A
B
B
Line 1
A
D101 - Q101 - R121 - C121 - R141 - T141 (1) - T141 (3) - C143 - R120 - IC501 (102)
D
Line 2
C
D201 - Q201 - R221 - C221 - R241 -T241 (1) - T241 (3) - C243 - R428 - IC501 (118)
IC101 (25) - C752 - R752 - L752 - SP (N)
SIGNAL ROUTE ROUTE
IN OUT
SIGNAL
USB Transimit data
(BBIC out)
IC501(47) - R977 - Q902 - IC902 - R978 - IC901(20)
USB Transimit data
(BBIC in)
IC901(21) - R972 - IC903 - IC501(48)
USB data
(USB in/out)
CN901(2) - L963 - IC901(3)
CN901(3) - L961 - IC901(4)
USB indicator
(BBIC in)
IC901(17) - R967 - IC904 - R968 - IC901(57)
USB indicator
(BBIC OUT)
IC701(21) - R615 - LED (901)
USB Reset IC501(58) - R969 - IC905 - R971 - Q774 - IC901(9)

18
KX-TG9471B/KX-TG9472B/KX-TGA939T
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.
7 Operating Instructions
Refer to the Operating Instructions.
Note:
You can download and refer to the Operating Instructions (Instruction book) on TSN Server.
7.1. Registering a Portable to the Base Unit
7.1.1. Deregistering a Portable
The supplied portable and base unit are pre-registered. If for some reason the portable is not
registered to the base unit, re-register the portable.
1 Portable:
2 Base unit:
Press and hold {LOCATOR}for about 5 seconds until the registration tone sounds.
LIf all registered portables start ringing, press {LOCATOR}again to stop, then repeat this step.
LThe next step must be completed within 90 seconds.
3 Portable:
Press {OK}, then wait until a long beepsounds.
Note:
LWhen you purchase an additional portable, refer to the additional portable’s installation manual for
registration.
{MENU}# 1 3 0
A portable can cancel its own registration to the base unit, or other portables registered to the same
base unit. This allows the portable to end its wireless connection with the system.
1
2
LAll portables registered to the base unit are displayed.
3Select the portable you want to cancel by pressing the desired portable(s) number.
LThe selected portable number(s) flashes.
LTo cancel a selected portable number, press the number again. The number willstop flashing.
4{OK}i
LWhen you cancel a different portable than the one you are now using, press {OFF}to exit.
{MENU}
# 1 3 1
i{OK}
3 3 5
: “
Yes ”i{SELECT}
{}

19
KX-TG9471B/KX-TG9472B/KX-TGA939T
7.2. Copying Phonebook Entries
You can copy phonebook entries from the base unit to a portable or vice versa.
Important:
• Group ringer tones are not copied.
• You cannot copy the phonebook entries between portables.
7.2.1. Copying All Entries
Base unit
1i{MENU}
i{MENU}
2
3Enter the portable number to copy to.
LWhen all entries have been copied, “Completed”is displayed.
4

(EXIT)
Portable
1
2
LWhen all entries have been copied,“Completed”is displayed.
3{OFF}
{}
{}
: “
Copy all ”i{SELECT}
{}
: “ Copy all to base ”i{SELECT}
{}
{MENU}# 2 8 0

20
KX-TG9471B/KX-TG9472B/KX-TGA939T
8 Service Mode
8.1. Engineering Mode
8.1.1. Base Unit
1). Press " " (middle soft key).
B/U key operation B/U LCD
Important:
Make sure the address on LCD is correct when entering new data. Otherwise, you may ruin the unit.
Engineering Mode
Read EEPROM
Write EEPROM
Engineering Mode
Read EEPROM
Write EEPROM
3). Select "Write EEPROM" by Navigator key.
4). Press " " (middle soft key).
2). Enter "7", "2", "6", "2", "7", "6", "6", "4".
Note: 7262 7664 = PANA SONI
(see letters printed on dial keys)
Set Address:
MENU
BACK
SELECT
SELECT
BACK
SELECT
LINE 1 LINE 2
LINE 1 LINE 2
LINE 1 LINE 2
LINE 1 LINE 2
BACK
BACK
SELECT
View Caller ID
BACK
OK
5). Enter " ٨ ", " ٨ ", " ٨ ", " ٨ " (Address). (*2)
Set Address:
Default Data
Display
Soft keys
Navigator key
{^}/{V}/{7}/{8})
{}(STOP) (EXIT)
(