Panasonic KX-TG2448BXF, Service Manual

Page: 2 / 98

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 8
4.3. Display 9
4.4. Settings 10
4.5. Troubleshooting 14
5 DISASSEMBLY INSTRUCTIONS 17
5.1. Base Unit 17
5.2. Handset 18
6 HOW TO REPLACE THE HANDSET LCD 19
7 TROUBLESHOOTING GUIDE 20
7.1. Check Power 21
7.2. Check Battery Charge 22
7.3. Check Link 23
7.4. Check the RF part 24
7.5. Check Handset Transmission 30
7.6. Check Handset Reception 30
7.7. Check Caller ID 30
8 ADJUSTMENT AND TEST MODE 31
8.1. Test Mode Flow Chart for Base Unit 31
8.2. Test Mode Flow Chart for Handset 35
8.3. X501 (Base Unit), X201 (Handset) Check 39
8.4. Adjust Battery Low Detector Voltage (Handset) 39
8.5. Base Unit Reference Drawing 40
8.6. Handset Reference Drawing 41
8.7. Frequency Table 42
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 BLOCK DIAGRAM (BASE UNIT_RF PART) 49
13 CIRCUIT OPERATION (BASE UNIT_MAIN) 50
13.1. DSP (Digital Speech/Signal Processing: IC501) 50
13.2. EEPROM (IC611) 50
13.3. Power Supply Circuit 51
13.4. Reset Circuit 53
13.5. Telephone Line Interface 54
13.6. Parallel Connection Detect Circuit 55
13.7. Calling Line Identification (Caller ID) 56
13.8. 2.4GHz Mod/Demod Circuit (Base Unit RF Part) 57
14 BLOCK DIAGRAM (HANDSET_MAIN) 58
15 BLOCK DIAGRAM (HANDSET_RF PART) 59
16 CIRCUIT OPERATION (HANDSET) 60
16.1. Construction 60
16.2. Power Supply Circuit 61
16.3. Charge Circuit 62
16.4. Ringer and Handset SP-Phone 62
16.5. Sending Signal 63
16.6. Reception Signal 63
16.7. 2.4GHz Mod/Demod Circuit (Handset RF Part) 64
17 SIGNAL ROUTE 65
18 CPU DATA (BASE UNIT) 66
18.1. IC501 66
19 CPU DATA (HANDSET) 67
19.1. IC201 67
20 EXPLANATION OF IC TERMINALS (RF PART) 68
20.1. IC901 68
21 HOW TO REPLACE A FLAT PACKAGE IC 69
21.1. PREPARATION 69
21.2. FLAT PACKAGE IC REMOVAL PROCEDURE 69
21.3. FLAT PACKAGE IC INSTALLATION PROCEDURE 70
21.4. BRIDGE MODIFICATION PROCEDURE 70
22 CABINET AND ELECTRICAL PARTS (BASE UNIT) 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
2
KX-TG2448BXF / KX-TG2448B XS / KX-TGA254BXF / KX-TGA254BXS