Panasonic KX-TCD220SLT - 25 Circuit Operation (Charger Unit); Power Supply Circuit

Panasonic KX-TCD220SLT

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25 CIRCUIT OPERATION (CHARGER UNIT)

25.1. Power Supply Circuit

The power supply is as shown.

76

KX-TCD220SLT / KX-TCA122EXT / KX-TCA121EXT

Table of Contents

Default Chapter2
- Table of Contents2
1 ABOUT LEAD FREE SOLDER (Pbf: Pb Free)4
- Suggested Pbf Solder4
- How to Recognize that Pb Free Solder Is Used5
2 For Service Technicians5
3 Caution5
4 Battery6
- Battery Installation6
- Battery Charge6
- Battery Life7
- Battery Replacement7
5 Location of Controls8
- Base Unit8
- Handset8
6 Settings9
- Connections10
- Guide to Settings11
- Ringer Volume13
- Night Mode14
- PIN Code15
- Reset16
- Key Lock17
- R Button to Use the Recall Feature17
- Pause Button for Pbx/Long Distance Service Users17
- Setting Call Restriction17
- Turning Call BAR On/Off (Call Prohibition)18
- Changing the Display Language18
- Changing the Recall Time18
- ARS (Automatic Route Selection)19
7 Display20
- Display Icons20
- Caller ID Display20
8 Operations21
- Turning the Power On/Off21
- Setting the Date and Time21
- Redialling21
- Phonebook22
  - Available Character Entries22
  - Copying Phonebook Entries to Other Handsets25
- Registering a Handset to a Base Unit26
  - Cancelling a Handset26
  - Cancelling a Base Unit27
- Selecting a Base Unit27
9 SMS (Short Message Service)28
- Writing and Sending a New Message28
- Available Character Entries for SMS29
- Sending a Saved Message30
- Editing and Sending a Saved Message30
- Erasing Saved Messages30
- Receiving a Message31
- Reading a Received Message31
- Replying to a Message31
- Erasing Received Messages31
- Changing SMS Message Centre Numbers32
- Turning SMS On/Off32
10 Answering System33
- Turning the Answering System On/Off33
- Greeting Message33
- Listening to Message34
- Using Direct Commands35
- Remote Operation36
11 Troubleshooting37
12 Disassembly Instructions40
- Base Unit40
- Handset41
- Charger Unit42
13 How to Replace the Handset Lcd43
14 Troubleshooting Flowchart44
- Check Power45
- Check Battery Charge46
- Check Link47
- Check Handset Transmission51
- Check Handset Reception51
- Check Caller ID51
- Bell Reception52
- Check TAM Operation52
15 Troubleshooting by Symptom (Base Unit and Charger Unit)53
- Check Point (Base Unit)53
- The Setting Method of JIG (Base Unit)57
- Adjustment Standard (Base Unit)58
- Check Point (Charger Unit)59
- Adjustment Standard (Charger Unit)59
16 Troubleshooting by Symptom (Handset)60
- Check Point (Handset)60
- Troubleshooting for Speakerphone64
- The Setting Method of JIG (Handset)65
- Adjustment Standard (Handset)66
17 Things to Do after Replacing IC67
- Base Unit67
- Handset67
18 Rf Specification68
- Base Unit68
- Handset68
19 How to Check the Handset Speaker or Receiver69
20 FREQUENCY TABLE (Mhz)69
21 Block Diagram (Base Unit)71
22 Circuit Operation (Base Unit)71
- Outline71
- Power Supply Circuit72
- Telephone Line Interface73
- Transmitter/Receiver73
23 Block Diagram (Handset)74
24 Circuit Operation (Handset)75
- Outline75
- Power Supply Circuit/Reset Circuit75
- Charge Circuit75
- Battery Low/Power down Detector75
- Speakerphone75
25 Circuit Operation (Charger Unit)76
- Power Supply Circuit76
26 Signal Route77
27 Cpu Data (Base Unit)79
- Ic8 (Bbic)79
28 Cpu Data (Handset)81
- Ic1 (Bbic)81
29 Engineering Mode83
- Base Unit83
- Handset86
30 How to Replace the Flat Package IC88
- Preparation88
- Flat Package IC Removal Procedure88
- Flat Package IC Installation Procedure89
- Bridge Modification Procedure89
31 Cabinet and Electrical Parts Location (Base Unit)90
32 Cabinet and Electrical Parts Location (Handset)91
33 Cabinet and Electrical Parts Location91
- Cabinet and Electrical Parts Location (Charger Unit)92
34 Accessories and Packing Materials93
- Kx-Tca121Ext94
35 TERMINAL GUIDE of the Ics, TRANSISTORS and DIODES95
- Base Unit95
- Handset95
- Charger Unit95
36 Replacement Parts List96
- Base Unit96
- Handset98
- Charger Unit99
- Accessories and Packing Materials99
- Fixtures and Tools100
37 For Schematic Diagram101
- Base Unit (SCHEMATIC DIAGRAM (BASE UNIT))101
- Handset (SCHEMATIC DIAGRAM (HANDSET))101
- Charger Unit (SCHEMATIC DIAGRAM (CHARGER UNIT))101
38 Schematic Diagram (Base Unit)102
39 Schematic Diagram (Handset)104
40 Schematic Diagram (Charger Unit)106
- Component View111
43 Circuit Board (Charger Unit)111

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