Panasonic KX-TG5621BXS User manual

© 2006 Panasonic Communications Co., Ltd. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
KX-TG5621BXS
KX-TGA561BXS
5.8 GHz Digital Cordless Phone
Silver Version
(for Asia, Middle Near East and Other area)
Telephone Equipment
ORDER NO. KM40602978CE

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 5
3 CAUTION 5
4 OPERATING INSTRUCTIONS 6
4.1. Battery 6
4.2. Location of Controls 7
4.3. Displays 8
4.4. Settings 10
4.5. Troubleshooting 14
5 DISASSEMBLY INSTRUCTIONS 16
5.1. Base Unit 16
5.2. Handset 17
6 HOW TO REPLACE THE HANDSET LCD 18
7 TROUBLESHOOTING GUIDE 19
7.1. Check Power 20
7.2. Check Battery Charge 21
7.3. Check Link 22
7.4. Check the RF part 23
7.5. Check Handset Transmission 29
7.6. Check Handset Reception 29
7.7. Check Caller ID 29
8 ADJUSTMENT AND TEST MODE 30
8.1. Test Mode Flow Chart for Base Unit 30
8.2. Test Mode Flow Chart for Handset 34
8.3. X501 (Base Unit), X201 (Handset) Check 38
8.4. Adjust Battery Low Detector Voltage (Handset) 38
8.5. Base Unit Reference Drawing 39
8.6. Handset Reference Drawing 40
8.7. Frequency Table 41
8.8. How to Clear User Setting (Handset Only) 43
9 DESCRIPTION 44
9.1. Frequency 44
9.2. FHSS (Frequency Hopping Spread Spectrum) 44
9.3. Signal Flowchart in the Whole System 46
10 EXPLANATION OF LINK DATA COMMUNICATION 47
10.1. Calling 47
10.2. To Terminate Communication 47
10.3. Ringing 47
11 BLOCK DIAGRAM (BASE UNIT_MAIN) 48
12 CIRCUIT OPERATION (BASE UNIT_MAIN) 49
12.1. DSP (Digital Speech/Signal Processing: IC501) 49
12.2. EEPROM: (IC611) 49
12.3. Power Supply Circuit 50
12.4. Reset Circuit 52
12.5. Telephone Line Interface 53
12.6. Parallel Connection Detect Circuit 54
12.7. Calling Line Identification (Caller ID) 55
13 BLOCK DIAGRAM (BASE UNIT_RF PART) 56
14 BLOCK DIAGRAM (HANDSET_RF PART) 57
15 CIRCUIT OPERATION (RF PART) 58
15.1. Power Supply Circuit 59
15.2. 2.4GHz Mod/Demod Circuit 60
15.3. 5.8GHz Converter Circuit 61
15.4. 5.8GHz PA (Power Amplifier), 5.8GHz LNA (Low Noise
Amplifier) and Antenna Switch Circuit 62
16 BLOCK DIAGRAM (HANDSET) 63
17 CIRCUIT OPERATION (HANDSET) 64
17.1. Construction 64
17.2. Power Supply Circuit 65
17.3. Charge Circuit 66
17.4. Ringer and Handset SP-Phone 66
17.5. Sending Signal 67
17.6. Reception Signal 67
18 SIGNAL ROUTE 68
19 CPU DATA (BASE UNIT) 69
19.1. IC501 69
20 CPU DATA (HANDSET) 70
20.1. IC201 70
21 EXPLANATION OF IC TERMINALS (RF PART) 71
21.1. IC701 71
Note:
Because CONTENTS 4 is the extract from the Operating Instructions of this model, it is subject to change without notice. You can
download and refer to the original Operating Instructions on TSN Server for further information.
CONTENTS
Page Page
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KX-TG5621BXS / KX-TGA561BXS

21.2. IC801 72
21.3. IC851 73
22 HOW TO REPLACE THE FLAT PACKAGE IC 74
22.1. Preparation 74
22.2. How to Remove the IC 74
22.3. How to Install the IC 75
22.4. How to Remove a Solder Bridge 75
23 HOW TO REPLACE THE LLP (Leadless Leadframe Package)
IC 76
23.1. Preparation 76
23.2. Caution 76
23.3. How to Remove the IC 76
23.4. How to Install the IC 77
23.5. How to Remove a Solder Bridge 77
24 CABINET AND ELECTRICAL PARTS (BASE UNIT) 78
25 CABINET AND ELECTRICAL PARTS (HANDSET) 79
26 ACCESSORIES AND PACKING MATERIALS 80
27 TERMINAL GUIDE OF THE ICs, TRANSISTORS AND DIODES
81
27.1. Base Unit 81
27.2. Handset 81
28 REPLACEMENT PARTS LIST 82
28.1. Base Unit 82
28.2. Handset 84
28.3. Accessories and Packing Materials 86
28.4. Fixtures and Tools 86
29 FOR SCHEMATIC DIAGRAM 87
29.1. Base Unit (SCHEMATIC DIAGRAM (BASE UNIT_MAIN))
87
29.2. Handset (SCHEMATIC DIAGRAM (HANDSET_MAIN)) 87
30 SCHEMATIC DIAGRAM (BASE UNIT_MAIN) 88
31 SCHEMATIC DIAGRAM (BASE UNIT_RF PART) 90
32 SCHEMATIC DIAGRAM (HANDSET_MAIN) 92
33 SCHEMATIC DIAGRAM (HANDSET_RF PART) 94
34 CIRCUIT BOARD (BASE UNIT_MAIN) 97
34.1. Component View 97
34.2. Flow Solder Side View 98
35 CIRCUIT BOARD (BASE UNIT_RF PART) 99
36 CIRCUIT BOARD (HANDSET_MAIN) 101
36.1. Component View 101
36.2. Flow Solder Side View 102
37 CIRCUIT BOARD (HANDSET_RF PART) 103
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KX-TG5621BXS / KX-TGA561BXS

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.
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).
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: 0.3mm, 0.6mm and 1.0mm.
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KX-TG5621BXS / KX-TGA561BXS

1.2. How to Recognize that Pb Free Solder is Used
(Example: Handset P.C.B.)
IC201
IC241
PbF
IC801 IC701
IC851
1
4
8
5
125
114
2815
26
50 51 7576
100
IC246
Marked
(Component View)
Note:
The location of the “PbF” mark is subject to change without notice.
2 FOR SERVICE TECHNICIANS
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.
3 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.
5
KX-TG5621BXS / KX-TGA561BXS

4 OPERATING INSTRUCTIONS
4.1. Battery
4.1.1. Battery Installation/Replacement
4.1.2. Battery Charge
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.
4.1.3. Battery Level
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KX-TG5621BXS / KX-TGA561BXS

4.1.4. Panasonic Battery Performance
4.2. Location of Controls
4.2.1. Base Unit
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KX-TG5621BXS / KX-TGA561BXS

4.2.2. Handset
4.3. Displays
4.3.1. Display Items
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KX-TG5621BXS / KX-TGA561BXS

4.3.2. Troubleshooting (Handset LCD)
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KX-TG5621BXS / KX-TGA561BXS

4.4. Settings
4.4.1. Connecting the AC adaptor and telephone line cord
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KX-TG5621BXS / KX-TGA561BXS

4.4.2. Programmable settings
You can customize the unit by programming the following features using the handset. To access the features, there are 2
methods: scrolling through the display menus or using the direct commands.
• Mainly the direct command method is used in this Service Manual.
4.4.2.1. Programming by scrolling through the Display Menus
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KX-TG5621BXS / KX-TGA561BXS

4.4.2.2. Programming using the Direct Commands
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KX-TG5621BXS / KX-TGA561BXS

4.4.3. Dial Lock
For Service Hint:
*: If the current password is forgotten, enter “726276642” and you will be able to go to step 3.
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KX-TG5621BXS / KX-TGA561BXS

4.5. Troubleshooting
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KX-TG5621BXS / KX-TGA561BXS

15
KX-TG5621BXS / KX-TGA561BXS

5 DISASSEMBLY INSTRUCTIONS
5.1. Base Unit
Shown in Fig.- To Remove - Remove -
1Cabinet Cover Screws (2.6 × 12).............(A) × 4
Main P.C. Board Solders
Main P.C. Board
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KX-TG5621BXS / KX-TGA561BXS

5.2. Handset
Shown in Fig.- To Remove - Remove -
2Cabinet Cover Screws (2 × 14).............(B) × 2
3Follow the procedure
4Main P.C. Board Tape and Solders
Screws (2 × 9)...............(C) × 3
Main P.C. Board
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KX-TG5621BXS / KX-TGA561BXS

6 HOW TO REPLACE THE HANDSET LCD
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KX-TG5621BXS / KX-TGA561BXS

Cross Reference:
Check Power (P.20)
Check Battery Charge (P.21)
Check Link (P.22)
Check the RF part (P.23)
Check Handset Transmission (P.29)
Check Handset Reception (P.29)
Check Caller ID (P.29)
7 TROUBLESHOOTING GUIDE
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KX-TG5621BXS / KX-TGA561BXS

Cross Reference:
Power Supply Circuit (P.50)
Reset Circuit (P.52)
Note:
DSP is IC501.
(*1) Refer to “SPECIFICATIONS” on cover page for part
number and supply voltage of AC adaptor.
7.1. Check Power
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KX-TG5621BXS / KX-TGA561BXS