Panasonic KX-TC1890B service manual - 900MHz Cordless Phone

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THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) :

KX-TC1890B




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  • Model: KX-TC1890B
  • File size: 4,051 Kb

TABLE OF CONTENTS

1 STANDARD BATTERY LIFE 4
2 LOCATION OF CONTROLS 5
2.1. Display 6
3 CONNECTION 9
3.1. Connecting the Telephone Line Code 9
4 OPERATION 11
4.1. Flash Button 11
5 DISASSEMBLY INSTRUCTIONS 12
6 ASSEMBLY THE LCD TO P.C. BOARD 13
7 ADJUSTMENT 15
7.1. Description 18
8 HOW TO CHECK THE RF UNIT 23
8.1. Finding out the Defective Unit 23
8.2. Check Items 23
9 IC DATA (BASE UNIT) 28
9.1. IC502 (BBIC) 28
9.2. IC702 (DSP) 29
10 IC DATA (HANDSET) 30
10.1. IC140 (BBIC) 30
11 EXPLANATION OF BBIC DATA COMMUNICATION 31
11.1. Calling 31
11.2. To Terminate Communication 31
11.3. Ringing 31
11.4. Ports for Transmitting and Receiving of Data 31
11.5. Air interface of DATA Used for Cordless Transmission and
Reception 32
12 FREQUENCY TABLE (MHz) 33
13 HOW TO REPLACE FLAT PACKAGE IC 34
13.1. Preparation 34
13.2. Procedure 34
13.3. Modification Procedure of Bridge 34
14 TERMINAL GUIDE OF IC´S, TRANSISTORS AND DIODES 35
14.1. Base Unit 35
14.2. Handset 35
15 FOR SCHEMATIC DIAGRAM 36
15.1. Base Unit (Page39, 40) 36
15.2. Handset (Page43, 44) 36
16 CIRCUIT BOARD (Base Unit) 37
16.1. Component View 37
16.2. Flows Solder Side View 38
17 SCHEMATIC DIAGRAM (Base Unit) 39
18 CIRCUIT BOARD (Handset) 41
19 SCHEMATIC DIAGRAM (Handset) 43
20 CIRCUIT BOARD (SUB for Handset) 45
21 SCHEMATIC DIAGRAM (SUB for Handset) 46
22 BLOCK DIAGRAM (Base Unit) 47
23 NEW CIRCUIT OPERATION (Base Unit) 48
23.1. Power Supply Circuit 48
23.2. Charge Circuit 48
23.3. DTMF Signal 49
23.4. MAIN CLOCK Circuit 49
23.5. Initializing Circuit 49
23.6. In Use Detector Circuit 50
23.7. Telephone Line Interface 51
23.8. Cross Point Switch and Line Receiving/Sending Signal 52
23.9. Calling Line Identification Circuit (Caller ID) 53
23.10. DSP (Digital Speech/Signal Processing) Circuit 56
23.11. SP-PHONE RX Circuit 57
23.12. SP-PHONE TX Circuit 57
23.13. Greeting Recording Circuit 58
23.14. Greeting Play Back Circuit 58
23.15. ICM Recording Circuit 59
23.16. ICM Play Circuit 59
23.17. Intercom Mode 59
24 BLOCK DIAGRAM (Handset) 60
25 NEW CIRCUIT OPERATION (Handset) 61
25.1. Power Supply Circuit 61
25.2. Charge Circuit 61
25.3. Ringer Circuit 62
25.4. CLOCK Circuit 62
25.5. Reception Signal Circuit 62
25.6. Sending Signal 63
26 TROUBLESHOOTING GUIDE 64
26.1. Battery won´t Charge (Base Unit) 65
26.2. Battery won´t Charge (Handset) 65
26.3. No Voice Reception 65
26.4. No Voice Transmission 67
26.5. No Voice Reception (SP Phone) 68
26.6. No Voice Transmission (SP Phone) 69
26.7. No Link 70
26.8. Call ID Problems 71
26.9. C-ID Modem IC Check 72
26.10. C-ID DSP Check 72
27 CABINET AND ELECTRICAL PARTS (Base Unit) 73
28 CABINET AND ELECTRICAL PARTS (Handset) 74
29 ACCESSORIES AND PACKING MATERIALS 75
30 REPLACEMENT PARTS LIST 76
30.1. Base Unit 76
30.2. Handset 81
30.3. KX-TC1890B 85


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