Panasonic KX-TG7844S Manuals

Manuals and User Guides for Panasonic KX-TG7844S. We have 1 Panasonic KX-TG7844S manual available for free PDF download: Service Manual

Panasonic KX-TG7844S Service Manual

Panasonic KX-TG7844S Service Manual (114 pages)

Handset/Base Unit

Brand: Panasonic | Category: Cordless Telephone | Size: 5.12 MB

Table of Contents

Table of Contents
3
Safety Precautions

5
- For Service Technicians
  5
Warning

5
- Battery Caution
  5
- About Lead Free Solder (Pbf: Pb Free)
  5
  - Suggested Pbf Solder
    6
  - Discarding of P. C. Board
    6
Specifications

7
Technical Descriptions

8
- Circuit Configuration of Tg78Xx Series Phones
  8
- US-DECT Description
  9
  - TDD Frame Format
    9
  - TDMA System
    9
  - Signal Flowchart in the Radio Parts
    10
  - Block Diagram (Base Unit_Main)
    11
  - Tel Interface Circuit
    12
  - Block Diagram (Base Unit_Rf Part)
    13
  - Circuit Operation (Base Unit)
    14
    
    BBIC (Base Band IC: IC501)
    14
    
    Flash Memory (IC502)
    14
    
    Flash Memory (IC601)
    14
    
    Eeprom (Ic611)
    14
    
    Bluetooth Unit (IC721)
    14
    
    Power Supply Circuit/Reset Circuit
    15
    
    Telephone Line Interface
    17
    
    Parallel Connection Detect Circuit/Auto Disconnect Circuit
    18
    
    Calling Line Identification (Caller ID)/Call Waiting Caller
    19
  - Block Diagram (Handset)
    21
  - Block Diagram (Handset_Rf Part)
    22
  - Circuit Operation (Handset)
    23
    
    Outline
    23
    
    Power Supply Circuit/Reset Circuit
    23
    
    Charge Circuit
    24
    
    Battery Low/Power down Detector
    24
    
    Speakerphone
    24
- Behavior of Electric Power Failure
  25
- Circuit Operation (Charger Unit)
  25
- Signal Route
  26
Location of Controls and Components

28
Installation Instructions

28
Operating Instructions

28
Test Mode

29
- Engineering Mode
  29
  - Base Unit
    29
  - Handset
    31
Service Mode

33
- How to Clear User Setting (Handset Only)
  33
Troubleshooting Guide

34
- Troubleshooting Flowchart
  34
  - Check Power
    35
  - Check Record
    36
  - Check Playback
    39
  - Check Battery Charge
    39
  - Check Link
    40
  - Check the RF Part
    42
  - Registering a Handset to the Base Unit
    46
  - Deregistering a Handset
    46
  - Check Handset Transmission
    47
- Check Handset Reception
  47
- Check Caller ID
  47
- Check BT Communication
  48
Disassembly and Assembly Instructions

50
- Disassembly Instructions
  50
  - Base Unit
    50
  - Handset
    52
  - Charger Unit
    53
- How to Replace the Base Unit LCD
  54
- How to Replace the Handset LCD
  56
Measurements and Adjustments

57
- Equipment Required
  57
- The Setting Method of JIG
  57
  - Connections (Base Unit)
    57
  - Connections (Handset)
    58
  - How to Install Batch File into P.C
    59
  - Commands
    60
- Adjustment Standard (Base Unit)
  61
  - Bottom View
    61
- Adjustment Standard (Handset)
  62
  - Component View
    62
- Things to Do after Replacing IC or X'tal
  63
  - How to Download the Data
    63
- Frequency Table
  66
- Bluetooth Frequency Table
  67
Miscellaneous

68
- How to Replace the LLP (Leadless Leadframe Package) IC
  68
  - Preparation
    68
  - Caution
    68
  - How to Remove the IC
    68
  - How to Install the IC
    69
- How to Replace the Flat Package IC
  70
  - Preparation
    70
  - How to Remove the IC
    70
  - How to Install the IC
    71
  - How to Remove a Solder Bridge
    71
- Terminal Guide of the Ics, Transistors and Diodes
  72
  - Base Unit
    72
  - Handset
    72
Schematic Diagram

73
Printed Circuit Board

83
- Circuit Board (Base Unit_Main)
  83
- Component View
  83
- Bottom View
  84
- Circuit Board (Base Unit_Operation)
  85
- Circuit Board (Base Unit_Usb Charge)
  86
- Circuit Board (Base Unit_Led)
  86
- Circuit Board (Handset_Main)
  87
  - Component View
    87
  - Bottom View
    88
Exploded View and Replacement Parts List

89
- Cabinet and Electrical Parts (Base Unit)
  89
- Cabinet and Electrical Parts (Handset)
  90
- Cabinet and Electrical Parts (Charger Unit)
  91
- Accessories and Packing Materials
  92
  - Kx-Tg7841S
    92
  - Kx-Tg7842S
    93
  - Kx-Tg7843S
    94
  - Kx-Tg7844S
    95
  - Kx-Tg7845S
    96
  - Kx-Tg365Sk
    97
  - Kx-Tg7871S
    98
  - Kx-Tg7872S
    99
  - Kx-Tg7873S
    100
- Kx-Tg7874S
  101
- Kx-Tg7875S
  102
- Kx-Tg385Sk
  103
- Kx-Tga680S
  104
- Replacement Parts List
  105
  - Base Unit
    105
  - Handset
    107
  - Charger Unit
    109
  - Accessories and Packing Materials
    109
  - Screws
    110
  - Fixtures and Tools
    110

Advertisement

Advertisement

Related Products

Panasonic Categories

Air Conditioner

Air Conditioner

Camcorder

Digital Camera

Cordless Telephone

Cordless Telephone

More Panasonic Manuals