Panasonic KX-TG2257BXS User manual

© 2002 Kyushu Matsushita Electric Co., Ltd. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
KX-TG2257BXS
2.4GHz Digital Cordless Answering
System
Silver Version
(for Asia, Middle Near East and Other area)
Telephone Equipment
ORDER NO. KM40206887C3

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 (at KX-
TG2257BXS) 5
2 STANDARD BATTERY LIFE 6
2.1. Battery Charge 6
2.2. Battery Strength 6
2.3. Recharge 6
2.4. Battery information 7
3 BATTERY REPLACEMENT 7
4 LOCATION OF CONTROLS 8
4.1. Base unit 8
4.2. Handset 9
5 DISPLAYS 10
5.1. Handset display 10
5.2. Base unit display 12
6 CONNECTIONS 13
6.1. Adding Another Phone 14
7 OPERATION 15
7.1. Making Calls 15
7.2. Answering Calls 21
7.3. Automatic Answering Operation 22
7.4. Listening to Messages 23
7.5. FLASH Button 26
8 DISASSEMBLY INSTRUCTIONS 27
9 ASSEMBLY INSTRUCTIONS 29
9.1. Assembly the LCD to P.C. Board (Handset) 29
10 TROUBLESHOOTING GUIDE 30
10.1. Check Power 31
10.2. Error Message Table 31
10.3. Check Record 32
10.4. Check Playback 33
10.5. Check Sp-phone Transmission 34
10.6. Check Sp-phone Reception 34
10.7. Check Battery Charge 35
10.8. Check Link 35
10.9. Check the RF Unit 36
10.10. Check Handset Transmission 41
10.11. Check Handset Reception 41
10.12. Check Caller ID 41
11 TEST MODE 42
11.1. Test mode flow chart for Base Unit 42
11.2. TAM Test mode flow chart 43
11.3. Test mode flow chart for Handset 44
11.4. X201 Check 44
11.5. Adjustment Battery Low Detector Voltage 45
11.6. Base Unit Reference Drawing 46
11.7. Handset Reference Drawing 47
CONTENTS
Page Page
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KX-TG2257BXS

11.8. Frequency Table 48
12 DESCRIPTION 49
12.1. Frequency 49
12.2. Time Division Duplex (TDD) operation 49
12.3. Signal Flowchart in the Whole System 50
13 EXPLANATION OF BBIC (Base Band IC) DATA
COMMUNICATION 51
13.1. Calling 51
13.2. To Terminate Communication 51
13.3. Ringing 51
13.4. Ports for Transmitting and Receiving of Data 51
14 BLOCK DIAGRAM (Base Unit) 52
15 CIRCUIT OPERATION (Base Unit) 53
15.1. DSP (Digital Speech/Signal Processing: IC201) 53
15.2. Flash Memory (IC300) 53
15.3. Power Supply Circuit 54
15.4. Reset Circuit 55
15.5. Locator/Intercom Mode 56
15.6. Telephone Line Interface 56
15.7. Auto Disconnect Circuit 57
15.8. Parallel Connection Detect Circuit 57
15.9. Signal Route 58
15.10. Calling Line Identification (Caller ID)/Call Waiting Caller ID
59
16 BLOCK DIAGRAM (Handset) 61
17 CIRCUIT OPERATION (Handset) 62
17.1. Construction 62
17.2. Power Supply Circuit 62
17.3. Charge Circuit 63
17.4. Ringer and Handset SP-Phone 63
17.5. Sending Signal 63
17.6. Reception Signal 64
18 CPU DATA (Base Unit) 65
18.1. IC201 65
19 CPU DATA (Handset) 66
19.1. IC201 66
20 EXPLANATION OF RF UNIT TERMINALS 67
20.1. IC101 67
21 HOW TO REPLACE A FLAT PACKAGE IC 68
21.1. Preparation 68
21.2. Procedure 68
21.3. Removing Solder from Between Pins 68
22 CABINET AND ELECTRICAL PARTS (Base Unit) 69
23 CABINET AND ELECTRICAL PARTS (Handset) 70
24 ACCESSORIES AND PACKING MATERIALS 71
25 TERMINAL GUIDE OF THE ICs, TRANSISTORS AND DIODES
72
25.1. Base Unit 72
25.2. Handset 72
26 REPLACEMENT PARTS LIST 73
26.1. Base Unit 73
26.2. Handset 75
27 FOR SCHEMATIC DIAGRAM 78
27.1. Base Unit (SCHEMATIC DIAGRAM (Base Unit)) 78
27.2. Handset (SCHEMATIC DIAGRAM (Handset)) 78
27.3. Memo 79
28 SCHEMATIC DIAGRAM (Base Unit) 80
29 SCHEMATIC DIAGRAM (Handset) 82
30 SCHEMATIC DIAGRAM (RF Unit) 84
31 CIRCUIT BOARD (RF Unit) 85
31.1. MEMO 86
32 CIRCUIT BOARD (Base Unit) 87
32.1. Component View 87
32.2. Flow Solder Side View 88
33 CIRCUIT BOARD (Handset) 89
33.1. Component View 89
33.2. Flow Solder Side View 90
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KX-TG2257BXS

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 when discussing the lead free solder used in our manufacturing process which is made from Tin, (Tn), 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° ~ 70° F, (30° ~ 40°C) higher than Pb solder. Please use a soldering iron with
temperature control and adjust it to 700° ± 20° F, (370° ± 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 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,
(Tn+Ag+Cu), you can also use Tin and Copper, (Tn+Cu), or Tin, Zinc, and Bismuth, (Tn+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
materials.
The following lead free (PbF) solder wire sizes are recommended for service of this product: 0.3mm, 0.6mm and 1.0mm.
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KX-TG2257BXS

1.2. How to recognize that Pb Free solder is used (at KX-TG2257BXS)
1.2.1. Base Unit PCB
PBF is stamped on the upper of DC jack to show that Pb free solder is used.(See the figure below.)
IC201
IC300
RFUNIT
PBF
1
2 3 4 5
7
8
9
10
11
12
13
G
G
G
G
G
G
G
G
G
G
G G G G G
151617 14
GGG GG
G
G
1
30
31
50
51
80
81
100
S
tamped PBF
(Component View)
1.2.2. Handset PCB
PBF is stamped between battery terminals to show that Pb free solder is used.(See the figure below.)
1
IC201
30
31
5081
100
51 80
RF_UNIT
PBF
Stamped PB
F
(Component View)
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KX-TG2257BXS

2.1. Battery Charge
2 STANDARD BATTERY LIFE
Place the handset on the base unit and charge for about 15 hours before initial use.
•• The IN USE/CHARGE indicator lights and a beep sounds.
2.2. Battery Strength
You can check the battery strength on the handset display.
The battery strength is as shown in the chart below.
2.3. Recharge
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-TG2257BXS

2.4. Battery information
After your Panasonic battery is fully charged:
3 BATTERY REPLACEMENT
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KX-TG2257BXS

4.1. Base unit
4 LOCATION OF CONTROLS
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KX-TG2257BXS

4.2. Handset
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KX-TG2257BXS

5 DISPLAYS
Both the handset and the base unit show you instructions and information on the displays. These display prompts are shown
below.
5.1. Handset display
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KX-TG2257BXS