Panasonic KX-TEA308CE

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20 FOR THE SCHEMATIC DIAGRAM

Note:

1. DC voltage measurements are taken with an oscilloscope or a tester with a ground.

2. The schematic diagrams and circuit board may be modified at any time with the development of new technology.

KX-TEA308CE

Main Page

Table of Contents2
ABOUT LEAD FREE SOLDER (Pbf: Pb Free)4
SUGGESTED Pbf SOLDER4
HOW to RECOGNIZE that Pb FREE SOLDER IS USED5
For Service Technicians7
Caution8
Safety Precautions8
Insulation Resistance Test8
Battery Caution8
Specifications9
General Description9
Characteristics9
System Capacity9
System Overview10
System Components10
System Connection Diagram11
Names and Locations12
Connection12
Serial Interface Connection12
Disassembly Instructions13
Disassembly Instruction13
Block Diagram15
System Block Diagram15
Power Block Diagram16
Kx-Tea308Ce Main Block Diagram16
Kx-Tea308Ce Co Block Diagram17
Kx-Tea308Ce Power Supply Unit Block Diagram17
Explanation of Block Diagram18
Main Unit (Kx-Tea308Ce)18
Circuit Operation20
Power Suppy Circuit20
Co Interface Circuit21
Cross Point Switch Circuit26
Intercom Circuit28
Power Failure through Call Switching Circuit29
Data Communication Circuit29
Control Circuit31
Tone Generator Circuit31
Dtmf Generator Circuit32
Dtmf Receiver Circuit32
Int Callid Interface Circuit33
Modem Interface Circuit33
Usb Interface Circuit34
Ogm Interface Circuit34
Ringing Signal Generator Circuit35
Smdr Interface Circuit35
Doorphone Card Interface (Kx-Te82460X)36
Built in Voice Message Card Interface (Kx-Te82492X)36
Call ID Card Interface (Kx-Te82493X)37
Troubleshooting Guide38
OPERATION (Check POWER SUPPLY BOARD, MAIN BOARD and 2AP BOARD)38
Dial Tone39
Cannot Dial40
Cannot Call Extension41
Cannot Use Proprietary Telephone41
Cannot Receive Incoming Call41
Cannot Send Dtmf Dialing42
Cannot Receive Call Dial Tone42
Cannot Send a Hold on Music43
IC Data 13.1. Ic70044
Ic746
Ic846
Terminal Guide of Ics, Transistors and Diodes47
How to Replace a Flat Package IC48
Preparation48
Removal Procedure48
Installation Procedure48
Removing Solder from between Pins48
Fixtures and Tools49
Cabinet and Electrical Parts Location50
Accessories and Packing Materials51
Replacement Parts List (Kx-Tea308Ce)52
Cabinet and Electrical Parts52
Accessories and Packing Materials52
Main Board Parts52
Co Board Parts59
Power Supply Board Parts61
Fixtures and Tools62
Memo63
For the Schematic Diagram64
Schematic Diagram (Kx-Tea308Ce)66
MAIN No.1 (Extention A-D Block)66
MAIN No.2 (Extention E-H Block)70
MAIN No.3 (Cross-Point Block)74
MAIN No.4 (ASIC, Memory Block)78
MAIN No.5 (CO Block)82
Power Supply86
Memo87
Printed Circuit Board (Kx-Tea308Ce)88
Main Board88
Co Board90
Power Supply92
Kx-Te82460X (2-Port Doorphone Card)93
HOW to RECOGNIZE that Pb FREE SOLDER IS USED94

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