Panasonic KX-TG9391T - Cordless Phone Base Station User manual

© 2008 Panasonic Communications Co., Ltd. All
rights reserved. Unauthorized copying and
distribution is a violation of law..
ORDER NO. KM40807646CE
F13
Telephone Equipment
Model No. KX-TG9391T
KX-TG9392T
KX-TGA939T
Digital Corded/Cordless Answering System
Titanium Black Version
(for U.S.A.)

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KX-TG9391T/KX-TG9392T/KX-TGA939T

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KX-TG9391T/KX-TG9392T/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
5.1. Controls -----------------------------------------------------18
6 Installation Instructions ---------------------------------------19
6.1. Connections------------------------------------------------19
6.2. Battery-------------------------------------------------------20
7 Operating Instructions-----------------------------------------22
7.1. Programmable settings ---------------------------------22
7.2. Registering a Portable to the Base Unit ------------27
7.3. Copying Phonebook Entries ---------------------------27
7.4. Dialing Mode ----------------------------------------------28
7.5. Error Messages -------------------------------------------28
7.6. Troubleshooting-------------------------------------------29
8 Service Mode -----------------------------------------------------32
8.1. Engineering Mode ----------------------------------------32
8.2. Copying Phonebook Items when Repairing -------36
8.3. How to Clear User Setting------------------------------38
9 Troubleshooting Guide ----------------------------------------39
9.1. Troubleshooting Flowchart -----------------------------39
9.2. Troubleshooting by Symptom (Base Unit and
Charger Unit) ----------------------------------------------52
9.3. Troubleshooting by Symptom (Portable) -----------56
10 Disassembly and Assembly Instructions ---------------60
10.1. Disassembly Instructions -------------------------------60
10.2. Assembly Instructions -----------------------------------65
11 Measurements and Adjustments---------------------------67
11.1. The Setting Method of JIG (Base Unit) -------------67
11.2. Adjustment Standard (Base Unit)---------------------69
11.3. Adjustment Standard (Charger Unit)-----------------70
11.4. The Setting Method of JIG (Portable) ---------------71
11.5. Adjustment Standard (Portable) ----------------------73
11.6. Things to Do after Replacing IC or X'tal ------------74
11.7. RF Specification-------------------------------------------76
11.8. How to Check the Portable Speaker or
Receiver ----------------------------------------------------77
11.9. Frequency Table (MHz) ---------------------------------77
12 Schematic Diagram ---------------------------------------------78
12.1. For Schematic Diagram---------------------------------78
12.2. Schematic Diagram (Base Unit_Main) --------------80
12.3. Schematic Diagram (Base Unit_Operation) -------84
12.4. Schematic Diagram (Portable) ------------------------86
12.5. Schematic Diagram (Charger Unit) ------------------88
13 Printed Circuit Board-------------------------------------------89
13.1. Circuit Board (Base Unit_Main) -----------------------89
13.2. Circuit Board (Base Unit_Operation) ----------------91
13.3. Circuit Board (Portable) -------------------------------- 92
13.4. Circuit Board (Charger Unit)--------------------------- 94
14 Miscellaneous---------------------------------------------------- 95
14.1. CPU Data (Base Unit) ---------------------------------- 95
14.2. CPU Data (Portable) ------------------------------------ 98
14.3. How to Replace the Flat Package IC ------------- 100
14.4. How to Replace the LLP (Leadless Leadframe
Package) IC --------------------------------------------- 102
14.5. Terminal Guide of the ICs, Transistors and
Diodes ---------------------------------------------------- 104
15 Exploded View and Replacement Parts List --------- 105
15.1. Cabinet and Electrical Parts (Base Unit) --------- 105
15.2. Cabinet and Electrical Parts (Portable)----------- 106
15.3. Cabinet and Electrical Parts (Charger Unit) ----- 107
15.4. Accessories and Packing Materials --------------- 108
15.5. Replacement Parts List-------------------------------- 111

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KX-TG9391T/KX-TG9392T/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
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 tem-
perature 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-TG9391T/KX-TG9392T/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 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-TG9391T/KX-TG9392T/KX-TGA939T
3 Specifications
Note:
• Design and specifications are subject to change without notice.
Note for service:
• Optional headset: KX-TCA60, KX-TCA86, KX-TCA92, KX-TCA93, KX-TCA94, KX-TCA95

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KX-TG9391T/KX-TG9392T/KX-TGA939T
4 Technical Descriptions
4.1. Block Diagram (Base Unit)
KX-T9391/9392 BLOCK DIAGRAM (Base Unit_Main)
IC501
DSP IC
L1 OUT
RF I/F
KEY IN/OUT LED LCD
FLASH
MEMORY (Program)
LCD DISPLAY
IC561 IC551 IC761
IC431
IC451
IC411
MIC
SPEAKER
HANDSET
KEY/LED
3.0V
3.0V
2.5V
2.5V
5V
3.0V
1.8V
3.6V
L2 Tx
Power Down
L2 Rx
T246
Q131
Q201
D201
IC161
D101
D181
IC186
Ringer
RL185
LINE1
LINE
2
Q101
Q102
Q191
Q131
IC261
Q371
IC341
IC311
IC326
2.5V 3.0V 3.6V
4V
5V
Power Down
DC6.5V
T241
Transformer
Transformer
Side Tone
Circuit
Transistor
RLY
BELL Detect/
Caller ID Circuit
BELL Detect/
Caller ID Circuit
Transistor
RLY
Transistor
RLY
+ - + -
+ - + -
Ringer IC
HOOK
SW
Transistor
RLY
Side Tone
Circuit
Power
Down
5V
Step Down
Converter
6.5V->4V
3.6V
IC331 3.0V IC321 2.5V
+ - + -
L2 Rx L2 Rx
PowerDown
RF UNIT
FLASH
MEMORY
(TAM)
Analog
Switch
IC701
TAM IC
EEPROM
BUS 12C SPI PCM
L1 IN
L1 RLY
L1 CID
L1 BELL
L2 OUT
L1 IN
L2 RLY
L2 CID
L2 BELL
VDDIO
VDD

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KX-TG9391T/KX-TG9392T/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
• Additionally,
- Power Supply Circuit (+4.0 V, +3.3 V, +2.5 V, +1.8 V output)
- Crystal Circuit (10.368 MHz)
- Charge Circuit
- Telephone Line Interface Circuit
• FLASH MEMORY 2: IC561
- Program DL
• LED Driver: IC641
• LCD Driver: IC641
• Key Matrix: IC631
• Handset Amplified
- MIC Amp: IC441
- Receiver Amp: IC451
- Analog sw: IC431

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KX-TG9391T/KX-TG9392T/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 →D301→IC311 →IC326 →D382 →Q386 →IC501
CN301 (+6.5 V) →F301 →D301→IC311 →IC326 →D382 →Q381 →IC501
• RF Module (IC801):
CN301 (+6.5 V) →F301 →D301→IC311 →IC321 →IC801 (PLL) (Power AMP)
• EEPROM (IC551)/FLASH MEMORY 1 (IC761)/FLASH MEMORY 2 (IC561)/Latch (IC631/641)/OP Amp (IC441/451):
Analog SW (IC431)
CN301 (+6.5 V) →F301 →D301 →IC311 →IC326 →D382 →Q381 →IC761, IC561, IC431, IC631, IC641, IC411, IC451,
IC551
• TAM Companion (IC701):
CN301 (+6.5 V) →F301 →D301 →IC311 →IC326 →D382 →IC701
CN301 (+6.5 V) →F301 →D301 →IC311 →IC326 →D382 →Q386 →IC701
CN301 (+6.5 V) →F301 →D301 →IC311 →IC326 →D382 →Q381 →IC701
• OP Amp (IC161, IC261):
CN301 (+6.5 V) →F301 →D301 →IC311 →IC336 →IC161/IC261
• OP Amp (IC171):
CN301 (+6.5 V) →F301 →D301 →IC311 →IC331 →IC171
<Fig.101>

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KX-TG9391T/KX-TG9392T/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, Q102
[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] →Q191 [-] →Q131 [Q231] →R124 [R224] →R125 [R225] →D125[D225]→Q102 [-] →
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 pro-
duce 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 Dia-
gram (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 sepa-
rates 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.

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KX-TG9391T/KX-TG9392T/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
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

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KX-TG9391T/KX-TG9392T/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 →BAT-
TERY+... 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.

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KX-TG9391T/KX-TG9392T/KX-TGA939T
4.5. Circuit Operation (Charger Unit)
4.5.1. Power Supply Circuit
The power supply is as shown.

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KX-TG9391T/KX-TG9392T/KX-TGA939T
4.6. Signal Route

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KX-TG9391T/KX-TG9392T/KX-TGA939T

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KX-TG9391T/KX-TG9392T/KX-TGA939T

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KX-TG9391T/KX-TG9392T/KX-TGA939T
Powered
Power Failed

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KX-TG9391T/KX-TG9392T/KX-TGA939T
5 Location of Controls and
Components
5.1. Controls
5.1.1. Base Unit
5.1.2. Portable

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KX-TG9391T/KX-TG9392T/KX-TGA939T
6 Installation Instructions
6.1. Connections
6.1.1. Connecting the AC Adaptor/Corded
Handset
Note:
• The AC adaptor must remain connected at all times. (It is
normal for the adaptor to feel warm during use.)
• The AC adaptor should be connected to a vertically oriented
or floor-mounted AC outlet. Do not connect the AC adaptor
to a ceiling-mounted AC outlet, as the weight of the adaptor
may cause it to become disconnected.
During a power failure
The base unit will work as a standard telephone using
power from the telephone line. Line 1 on the corded hand-
set can be used to make and answer calls. The base unit
speakerphone and the cordless handset will not function
during a power failure.
6.1.2. Connecting the Telephone Line
Cord
Refer to one of the following methods depending on your situa-
tion:
-To connect to a 2-line telephone jack
-To connect to 2 single-line telephone jacks
-If you use the unit as a single-line telephone only
Connect the telephone line cord until it clicks into the base unit
and telephone line jack.
To connect to a 2-line telephone jack
To connect to 2 single-line telephone jacks
If you use the unit as a single-line telephone only
Note:
• “Check tel line 2” is displayed on the unit. To erase it, see
Error Messages (P.28)

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KX-TG9391T/KX-TG9392T/KX-TGA939T
If you subscribe to a DSL/ADSL service
Please attach a DSL/ADSL filter (contact your DSL/ADSL
provoder) to the telephone line between the base unit and
the telephone line jack in the event of the following:
-noise is heard during conversations.
-Caller ID features do not function properly.
6.2. Battery
6.2.1. Battery Installation and
Replacement
Important:
• Use only the supplied rechargeable batteries (Part No. HHR-
55AAABU).
• When installing the batteries:
-Wipe the battery ends ( , ) with a dry cloth.
-Avoid touching the battery ends ( , )or the unit contacts.
-Confirm correct polarities ( , ).
• When replacing the batteries:
-USE ONLY rechargeable Ni-MH batteries AAA (R03) size.
-Do NOT use Alkaline/Manganese/Ni-Cd batteries.
-We recommend using the panasonic rechargeable batteries
HHR-4DPA.