Panasonic KX-TG2248S Service Manual ▷ View online
KX-TG2248S
2.4GHz
Digital
Cordless
Answering
System
Silver Version
(for U.S.A.)
Telephone Equipment
ORDER NO. KM40303044C1
F12
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-
TG2248S)
5
2
FOR SERVICE TECHNICIANS
6
3
CAUTION
6
4
BATTERY
7
4.1.
Installing the Battery in the Handset
7
4.2.
Battery Charge
7
4.3.
Battery Recharge
7
4.4.
Battery Strength
7
4.5.
Battery Replacement
8
4.6.
Battery information
8
5
LOCATION OF CONTROLS
9
5.1.
Base Unit
9
5.2.
Handset
10
6
DISPLAY
11
6.1.
Troubleshooting
11
7
openLCR Service for Caller IQ Feature
15
7.1.
Setting Caller IQ to OFF and ON (Handset)
15
7.2.
Downloading Phone Book Data
16
7.3.
Information Download (Handset)
17
8
SETTINGS
18
8.1.
Connections
18
8.2.
Display Language (Handset)
18
8.3.
Dialing Mode (Handset)
18
8.4.
Direct Commands
19
9
OPERATIONS
20
9.1.
Making Calls (Handset)
20
9.2.
Answering Calls
22
9.3.
FLASH Button (Handset)
23
9.4.
Erasing Messages
24
9.5.
Phone Book
25
10 DISASSEMBLY INSTRUCTIONS
29
11 ASSEMBLY INSTRUCTIONS
31
11.1. Fix the LCD to P.C. Board (Handset)
31
11.2. Connect the Small P.C. Board to Main P.C. Board
(Handset)
32
12 TROUBLESHOOTING GUIDE
33
12.1. Check Power
34
12.2. Error Message Table
34
12.3. Check Record
35
12.4. Check Playback
36
12.5. Check Battery Charge
37
12.6. Check Link
37
12.7. Check the RF Unit
38
12.8. Check Handset Transmission
43
12.9. Check Handset Reception
43
12.10. Check Caller ID
43
13 TEST MODE
44
13.1. Test mode flow chart for Base Unit
44
13.2. TAM Test mode flow chart
45
13.3. Test mode flow chart for Handset
46
13.4. X201 Check
47
13.5. Adjustment Battery Low Detector Voltage
47
13.6. Base Unit Reference Drawing
48
13.7. Handset Reference Drawing
49
13.8. Frequency Table
50
14 DESCRIPTION
51
14.1. Frequency
51
14.2. Time Division Duplex (TDD) operation
51
14.3. Signal Flowchart in the Whole System
52
15 EXPLANATION OF BBIC (Base Band IC) DATA
COMMUNICATION
53
15.1. Calling
53
15.2. To Terminate Communication
53
15.3. Ringing
53
15.4. Ports for Transmitting and Receiving of Data
53
16 BLOCK DIAGRAM (Base Unit)
54
17 CIRCUIT OPERATION (Base Unit)
55
17.1. DSP (Digital Speech/Signal Processing: IC201)
55
17.2. Flash Memory (IC300)
55
17.3. Power Supply Circuit
56
17.4. Reset Circuit
57
17.5. Locator/Intercom Mode
58
17.6. Telephone Line Interface
58
17.7. Auto Disconnect Circuit
59
17.8. Parallel Connection Detect Circuit
59
17.9. Calling Line Identification (Caller ID)/Call Waiting Caller ID
60
18 BLOCK DIAGRAM (Handset)
62
19 CIRCUIT OPERATION (Handset)
63
19.1. Construction
63
19.2. Power Supply Circuit
63
CONTENTS
Page
Page
2
KX-TG2248S
19.3. Charge Circuit
64
19.4. Ringer and Handset SP-Phone
64
19.5. Sending Signal
64
19.6. Reception Signal
65
19.7. Small P.C.B.
65
20 SIGNAL ROUTE
66
21 CPU DATA (Base Unit)
67
21.1. IC201
67
22 CPU DATA (Handset)
68
22.1. IC201
68
23 EXPLANATION OF RF UNIT TERMINALS
69
23.1. IC801
69
24 HOW TO REPLACE A FLAT PACKAGE IC
70
24.1. Preparation
70
24.2. Procedure
70
24.3. Removing Solder from Between Pins
70
25 CABINET AND ELECTRICAL PARTS (Base Unit)
71
26 CABINET AND ELECTRICAL PARTS (Handset)
72
27 ACCESSORIES AND PACKING MATERIALS
73
28 TERMINAL GUIDE OF THE ICs, TRANSISTORS AND DIODES
74
28.1. Base Unit
74
28.2. Handset
74
29 REPLACEMENT PARTS LIST
75
29.1. Base Unit
75
29.2. Handset
77
30 FOR SCHEMATIC DIAGRAM
80
30.1. Base Unit (SCHEMATIC DIAGRAM (BASE UNIT))
80
30.2. Handset (SCHEMATIC DIAGRAM (HANDSET))
80
30.3. Memo
81
31 SCHEMATIC DIAGRAM (BASE UNIT)
82
31.1. Main
82
31.2. Operation
84
31.3. Memo
85
32 SCHEMATIC DIAGRAM (HANDSET)
86
32.1. Memo
88
33 CIRCUIT BOARD (BASE UNIT)
89
33.1. Main
89
33.2. Operation
91
34 CIRCUIT BOARD (Handset)
93
34.1. Component View
93
34.2. Flow Solder Side View
94
3
KX-TG2248S
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.
contains lead.
We will use PbF when discussing the lead free solder used in our manufacturing process which is made from Tin (Sn), Silver
(Ag), and Copper (Cu).
(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.
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.
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.
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).
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,
(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
materials.
The following lead free (PbF) solder wire sizes are recommended for service of this product: 0.3mm, 0.6mm and 1.0mm.
4
KX-TG2248S