Panasonic KX-A144 Series User manual

©2004 Panasonic Communications Co., Ltd. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
KX-TCD440HGS
KX-TCD440HGT
KX-A144EXS-1
KX-A144EXS
KX-A144EXT-1
KX-A144EXT
Digital Cordless Phone
New Silver Version
Titanium Black Version
(for Hungary)
Telephone Equipment
11ORDER NO. KM40406454C2

1 ABOUT LEAD FREE SOLDER (PbF: Pb free) 4
1.1. Suggested PbF Solder 4
1.2. How to recognize that Pb Free solder is used 5
2 FOR SERVICE TECHNICIANS 7
3 CAUTION 7
4 SPECIFICATIONS 7
5 BATTERY 8
5.1. Battery Installation 8
5.2. Battery Charge 8
5.3. Battery Life 9
5.4. Battery Replacement 9
6 LOCATION OF CONTROLS 10
6.1. Base Unit 10
6.2. Handset 10
7 SETTINGS 11
7.1. Connections 11
7.2. Ringer Volume 12
7.3. PIN Code 13
7.4. Reset 14
7.5. Key Lock 15
7.6. R button to use the recall feature 15
7.7. Pause button for PBX line/long distance service users 15
7.8. Setting Call Restriction 16
7.9. Cancelling a Restricted Number 16
7.10. Setting Call BAR 16
7.11. Selecting the Display Language 17
7.12. Setting Dialling Mode (tone/pulse) 17
7.13. Setting Flash Time 17
8 DISPLAY 18
8.1. Handset Display 18
8.2. Caller ID Display 18
8.3. Before Requesting Help (Troubleshooting) 19
9 OPERATIONS 21
9.1. Turning the Power On/Off 21
9.2. Setting the Time and Date 21
9.3. Redialling 21
9.4. Phonebook 22
9.5. Registering a Handset to a Base Unit 24
9.6. Selecting a Base Unit 25
10 DISASSEMBLY INSTRUCTIONS 26
10.1. Base Unit 26
10.2. Handset 27
10.3. Charger Unit 28
11 ASSEMBLY INSTRUCTIONS 29
11.1. Warning When Constructing the Base Unit 29
11.2. Processing of Ringer/Charge Terminal Lead 30
12 TROUBLESHOOTING GUIDE 31
12.1. Check Power 32
12.2. Check Battery Charge 33
12.3. Check Link 34
12.4. Check Handset Transmission 36
12.5. Check Handset Reception 36
12.6. Check Caller ID 36
12.7. Bell Reception 37
13 CHECK PROCEDURE (BASE UNIT) 38
13.1. Preparation 38
13.2. PC Setting 38
14 CHECK PROCEDURE (HANDSET) 39
14.1. Preparation 39
14.2. PC Setting 39
15 ADJUSTMENTS (BASE UNIT AND CHARGER UNIT) 40
15.1. Adjustment (Base Unit) 40
15.2. Adjustment Standard (Base Unit) 44
15.3. Adjustment (Charger Unit) 46
15.4. Adjustment Standard (Charger Unit) 46
16 ADJUSTMENTS (HANDSET) 47
16.1. Adjustment (Handset) 47
16.2. Adjustment Standard (Handset) 50
17 RF SPECIFICATION 51
17.1. Base Unit 51
17.2. Handset 51
18 HOW TO CHECK THE HANDSET SPEAKER OR RECEIVER 51
Note:
Because CONTENTS 5 to 9 are the extracts from the Operating Instructions of this model, they are subject to change without
notice. Please refer to the original Operating Instructions for further information.
CONTENTS
Page Page
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

19 FREQUENCY TABLE (MHz) 52
20 BLOCK DIAGRAM (BASE UNIT) 53
21 CIRCUIT OPERATION (BASE UNIT) 54
21.1. Outline 54
21.2. Power Supply Circuit 55
21.3. Telephone Line Interface 56
21.4. Transmitter/Receiver 56
21.5. Pulse Dialing 56
22 BLOCK DIAGRAM (HANDSET) 57
23 CIRCUIT OPERATION (HANDSET) 58
23.1. Outline 58
23.2. Power Supply Circuit/Reset Circuit 58
23.3. Charge Circuit 58
23.4. Battery Low/Power Down Detector 58
23.5. Speakerphone 58
24 CIRCUIT OPERATION (CHARGER UNIT) 59
24.1. Power Supply Circuit 59
25 SIGNAL ROUTE 60
26 CPU DATA (BASE UNIT) 61
26.1. IC2 (BBIC) 61
27 CPU DATA (HANDSET) 63
27.1. IC1 (BBIC) 63
28 EEPROM LAYOUT (BASE UNIT) 65
28.1. Scope 65
28.2. Introduction 65
28.3. EEPROM Layout 65
29 EEPROM LAYOUT (HANDSET) 68
29.1. Scope 68
29.2. Introduction 68
29.3. EEPROM contents 68
30 HOW TO REPLACE FLAT PACKAGE IC 71
30.1. Preparation 71
30.2. Procedure 71
30.3. Modification Procedure of Bridge 71
31 CABINET AND ELECTRICAL PARTS LOCATION (BASE UNIT)
72
32 CABINET AND ELECTRICAL PARTS LOCATION (HANDSET)
73
33 CABINET AND ELECTRICAL PARTS LOCATION (CHARGER
UNIT) 74
34 ACCESSORIES AND PACKING MATERIALS 75
34.1. KX-TCD440HGS/HGT 75
34.2. KX-A144EXS/EXT 76
35 TERMINAL GUIDE OF THE ICs, TRANSISTORS AND DIODES
77
35.1. Base Unit 77
35.2. Handset 77
35.3. Charger Unit 77
36 REPLACEMENT PARTS LIST 78
36.1. Base Unit 78
36.2. Handset 79
36.3. Charger Unit 80
36.4. Accessories and Packing Materials 81
36.5. Fixtures and Tools 81
36.6. Memo 82
37 FOR SCHEMATIC DIAGRAM 83
37.1. Base Unit (SCHEMATIC DIAGRAM (BASE UNIT)) 83
37.2. Handset (SCHEMATIC DIAGRAM (HANDSET)) 83
37.3. Charger Unit (SCHEMATIC DIAGRAM (CHARGER UNIT))
83
38 SCHEMATIC DIAGRAM (BASE UNIT) 84
39 SCHEMATIC DIAGRAM (HANDSET) 86
40 SCHEMATIC DIAGRAM (CHARGER UNIT) 88
41 CIRCUIT BOARD (BASE UNIT) 89
41.1. Component View 89
41.2. Flow Solder Side View 90
42 CIRCUIT BOARD (HANDSET) 91
42.1. Component View 91
42.2. Flow Solder Side View 92
43 CIRCUIT BOARD (CHARGER UNIT) 93
43.1. Component View 93
43.2. Flow Solder Side View 93
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

1 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 although, with some precautions, standard Pb solder can also be used.
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). In case of using high temperature soldering iron, please
be careful not to heat too long.
· PbF solder will tend to splash if it is heated much higher than its melting point, approximately 1100 °F (600 °C).
· If you must use Pb solder on a PCB manufactured using PbF solder, remove as much of the original PbF solder as possible
and be sure that any remaining is melted prior to applying the Pb solder.
· 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).
1.1. 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.
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

1.2. How to recognize that Pb Free solder is used
1.2.1. Base Unit PCB
PbF
IC3
IC2
IC1
1
11
28
18
164
48
49
3332
16
17
Marked
(Component View)
TP1
TP84
TP97
TP82 TP187
TP91
TP188
TP101
TP89
TP2
1
2
4
6
TP5
TP90
TP50
TP202
TP201
TP45
TP3
TP39
TP40
J101 J103 J104 J102 J105
+2.65V SDA SCL GND VBACK
CHARGE
PbF
CHARGE
RINGER
RINGER
C99
Marked
(Flow Solder Side View)
Note:
The location of the “PbF”mark is subject to change without notice.
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

1.2.2. Handset PCB
IC1
100
1
8081
50
51
31
30
IC2
5
8
4
111 18
281
IC3
PbF
Marked
(Component View)
1
PROG
PbF
BOOK
UP
POWER
CAN
DOWN
RIGHT
REDIAL
LEFT
1
2
36
5
7
0
#
R4
9
8
INT
MIC
TALK 36
CN2
LED101
LED107
LED108
SP_
LED104
LED106
LED105
LED102 LED103
Marked
(Flow Solder Side View)
Note:
The location of the “PbF”mark is subject to change without notice.
1.2.3. Charger Unit PCB
PbF
D1
J1
Marked
PbF
R1 R2
TP4
TP1
TP2
TP3
Marked
(Component View) (Flow Solder Side View)
Note:
The location of the “PbF”mark is subject to change without notice.
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

2 FOR SERVICE TECHNICIANS
ICs and LSIs are vulnerable to static electricity.
When repairing, the following precautions will help prevent recurring malfunctions.
1.Cover the plastic parts boxes with aluminum foil.
2.Ground the soldering irons.
3.Use a conductive mat on the worktable.
4.Do not touch IC or LSI pins with bare fingers.
3 CAUTION
Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the
manufacturer.
Dispose of used batteries according to the manufacture’s Instructions.
4 SPECIFICATIONS
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

5 BATTERY
5.1. Battery Installation
1.Insert the batteries negative (-) terminal first.
2.Close the battery cover.
Note:
· Use only rechargeable P03P (Ni-MH)/P03H (Ni-Cd) batteries.
5.2. Battery Charge
Place the handset on the base unit for about 7 hours before initial use.
When the batteries are fully charged, flashes. When charging, the battery icon is shown as follows.
Note:
· Clean the charge contacts of the handset and base unit with a soft, dry cloth, otherwise the batteries may not charge
properly. Clean if the unit is exposed to grease, dust or high humidity.
· If the handset is turned off, it will be turned on automatically when it is placed on the base unit.
Note for Service:
· The battery strength may not be indicated correctly if the battery is disconnected and connected again, even after it is fully
charged.
· In that case, by recharging the battery as mentioned above, you will get a correct indication of the battery strength.
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

5.3. Battery Life
After your Panasonic batteries are fully charged, you can expect the following performance:
Note:
· The included batteries are Ni-MH batteries.
· Battery operating time may be shortened depending on usage conditions and ambient temperature.
5.4. Battery Replacement
If flashes even when the handset batteries have been fully charged, both batteries must be replaced.
Important:
· Please use only the Panasonic batteries P03P(Ni-MH)/P03H(Ni-Cd).
· Use only rechargeable batteries. If you install non-rechargeable batteries and start charging, the batteries may leak
electrolyte.
· Do not mix old and new batteries.
· Use only 2 nickel metal hydride (Ni-MH) batteries or 2 nickel cadmium (Ni-Cd) batteries. Do not mix battery types.
· Ensure that the correct battery type is selected.
1. Press the notch on the cover firmly and slide it in the direction of the arrow.
2. Remove the batteries positive (+) terminal first. Replace both batteries.
Note for Service:
· When Ni-Cd batteries are fitted with the setting in ,icon might disappear and stop charging
even if the handset is on the cradle for avoiding overcharge.
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

6 LOCATION OF CONTROLS
6.1. Base Unit
6.2. Handset
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

Important information
7 SETTINGS
General
· Use only the power supply included with this products.
· Do not connect the AC adaptor to any AC outlet other than a standard 220 —240 V AC outlet.
· This product is unable to make calls when:
− − −
− The portable handset batteries need recharging or have failed.
− − −
− There is a power failure.
− − −
− The key lock feature is turned on.
− − −
− The call bar feature is turned on (only numbers stored as emergency numbers can be called).
· Do not open the base unit or handset (other than to change the batteries).
· This product should not be used near emergency/intensive care medical equipment and should not be used by people with
pacemakers.
· Care should be taken that objects do not fall onto, and liquids are not spilled into, the unit. Do not subject this product to
excessive smoke, dust, mechanical vibration or shock.
Environment
· Do not use this product near water.
· This product should be kept away from heat sources such as radiators, cookers, etc. It should also not be placed in rooms
where the temperature is less than 5 °C or greater than 40 °C.
· The AC adaptor is used as the main disconnect device. Ensure that the AC outlet is located/installed near the unit and is
easily accessible.
Location
For maximum distance and noise-free operation, place your base unit:
- Away from electrical appliances such as TVs, radios, personal computers or other phones.
- In a convenient, high and central location.
Warning:
· To prevent the risk of electrical shock, do not expose this product to rain or any other type of moisture.
7.1. Connections
7.1.1. Base Unit
· If the handset is not charged, you cannot make or answer calls.
· Never install telephone wiring during a lightning storm.
· The AC adaptor must remain connected at all times. (It is normal for the adaptor to feel warm during use.)
· Use only the AC adaptor PQLV19CEZ.
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

7.1.2. Charger Unit
· The AC adaptor must remain connected at all times (It is normal for the adaptor to feel warm during use).
· Use only the AC adaptor PQLV200CEZ.
7.2. Ringer Volume
7.2.1. Base Unit
7.2.2. Handset
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

7.3. PIN Code
Important:
· If you changed the PIN, please write down your new PIN as the unit will not reveal the PIN to you. If you forget your PIN,
consult your nearest Panasonic service centre.
7.3.1. Base Unit
For Service Hint:
*: If the current 4-digit PIN is forgotten, press and you will be able to enter new PIN.
7.3.2. Handset
For Service Hint:
*: If the current 4-digit PIN is forgotten, press and you will be able to enter new PIN.
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

7.4. Reset
7.4.1. Base Unit
Note:
· The emergency number setting will not be reset.
Base Unit Initial Settings
Function Initial Setting Remarks (selectable options)
Base Unit Ringer Volume 21to3,OFF
Ringer Mode All Handsets All Handsets/Specific Handset No.
Number of Rings (Ringer Mode) 3Up to 6 rings
Dialling mode Tone Tone/Pulse
Flash time 100 msec 600/100 msec
Pause Length 3 seconds 3 seconds/5 seconds
Call Restricted Handsets All Clear Each Handset can be set individually.
Call Restriction Numbers All Clear Up to 10 numbers (up to 8 digits)
4-Digit Base Unit PIN 0000 -
Caller ID All Clear Up to 50 different callers
7.4.2. Handset
Note:
· Phonebook entries will not be erased.
· The battery type setting will not be reset.
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

Handset Initial Settings
Function Initial Setting Remarks (selectable options)
Select Base Unit Auto -
Time Alarm Mode OFF OFF/Once/Daily
Alarm Time Clear -
Handset Ringer Volume 61to6,OFF
Handset External Ringer Pattern 120 patterns
Handset Internal Ringer Pattern 120 patterns
Handset Paging Tone Pattern 120 patterns
Handset Alarm Tone Pattern 120 patterns
Key Tone ON ON/OFF
Call Waiting Tone ON ON/OFF
Range Warning Alarm OFF OFF/ON
Battery Low Alarm ON ON/OFF
Standby Mode Display Clock Clock/OFF/Base No./Handset No.
Talk Mode Display Talk Time Talk Time/Phone No.
Display Language Hungarian 10 languages
Call BAR OFF OFF/ON
Direct Call Mode OFF OFF/ON
Direct Call Number Clear Up to 24 digits
4-Digit Handset PIN 0000 -
Auto Talk OFF OFF/ON
Redial Memory All Clear Up to 10 numbers (up to 24 digits)
Handset Receiver Volume 21to3
Handset Speaker Volume 31to6
7.5. Key Lock
The dial keys can be locked so that no calls can be made. Only incoming calls will be accepted while key lock is on.
Note:
· Emergency calls cannot be made until key lock is turned off.
· Key lock is turned off when the handset is turned off.
7.6. R button to use the recall feature
7.7. Pause button for PBX line/long distance service users
A pause is sometimes required when making calls using a PBX or long distance service.
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

7.8. Setting Call Restriction
You can restrict selected handsets from dialling certain phone numbers. You can assign up to 10 phone numbers (memory
locations 1-10) to be restricted per handset. If a restricted number is dialled, the call will not be connected and the restricted
number will flash on the display. For example, storing an area code will prevent a handset from dialling a long distance call.
7.9. Cancelling a Restricted Number
7.10. Setting Call BAR
This feature prohibits making outside calls. When call bar is turned on, only intercom calls and emergency calls can be made.
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

7.11. Selecting the Display Language
10 display languages are available.
Note:
· If you select a language you cannot read, reset the handset to its default settings. Refer to Handset (P.14) in “Reset”.
7.12. Setting Dialling Mode (tone/pulse)
7.13. Setting Flash Time
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

8 DISPLAY
8.1. Handset Display
For Service Hint:
icon will be displayed if the unit took a signal from Telephone Company as a Voice Message signal.
In that case, press the left button of the Navigator Key for a while.
8.2. Caller ID Display
Important:
This unit is Caller ID compatible. To display the caller’s phone number, you must subscribe to Caller ID service. After
subscribing to Caller ID service, this unit will display caller information.
How Caller ID is displayed
The unit will display the calling party’s phone number after the first ring. You can view the caller information of the last 50
different callers.
When new calls have been received, the display will show the number of new calls.
The number of new calls will be cleared after viewing all caller information.
Example: 4 new calls have been received.
Note:
· When you receive a call from the same phone number you stored with a name in the phonebook, the display will show the
stored name.
· If the unit is connected to a PBX system, you may not receive the caller information.
· When the caller dialled from an area which does not provide Caller ID service, will be displayed.
· When the caller requested not to send caller information, either no information or will be displayed.
· The display will not show caller information while using the handset for an intercom call. However, the caller information will
be stored.
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

8.3. Before Requesting Help (Troubleshooting)
If you still have difficulties after following the instructions in this section, disconnect the AC adaptor and turn off the handset,
then reconnect the AC adaptor and turn on the handset.
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

Cross reference:
(*1) Registering a Handset to a Base Unit (P.24).
(*2) Setting Call BAR (P.16).
(*3) Setting Call Restriction (P.16).
(*4) Key Lock (P.15).
(*5) Setting Dialling Mode (tone/pulse) (P.17).
(*6) Ringer Volume (P.12).
(*7) Turning the Power On/Off (P.21).
(*8) Battery Installation (P.8).
(*9) Battery Charge (P.8).
(*10) Battery Replacement (P.9).
(*11) Cancelling a Base Unit (P.25).
(*12) Cancelling a Handset (P.24).
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KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT