Service Manuals, User Guides, Schematic Diagrams or docs for : panasonic TV GP31 chassis gp31_technical_guide_133

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      Technical Guide
             Colour Television

               GP 31 Chassis

            Circuit Explanations




Panasonic                   Panasonic AVC Networks
                          Kuala Lumpur Malaysia Sdn. Bhd.


                     1
                                   Contents
Introduction                                       3
Location of Control & Circuit Boards               4
GP-31 Chassis Block Diagram                        5
1. Tuning Circuit
       1.1 Signal Processing                       6
       1.2 IF Control                              6
2. Ultimate One Chip IC601
       2.1 Features                                8
       2.2 IIC Bus                                 9
       2.3 Memory IC                               9
       2.4 Reset Circuit                           10
       2.5 IC601 Pin Configuration                 11
3. Video Circuit
       3.1 Video Signal Processing                 14
4. Audio Circuit
       4.1 Audio Processor                         17
               4.1.1 Sound Processor               17
               4.1.2 Audio Amplifier               17
5. Deflection Circuit
       5.1 Horizontal Output Circuit               20
               5.1.1 Horizontal Output Operation   21
       5.2 Vertical Output Circuit                 23
               5.2.1 Vertical Output Operation     23
6. Colour Output
       6.1 Colour Output Stage                     24
7. Protection Circuit                              25
8. Power Circuit
       8.1 Start-up Circuit                        29
       8.2 Output Voltage Control                  29
       8.3 Regulation                              30
       8.4 Over Voltage Protection Circuit         30
       8.5 Over Current Protection Circuit         31
       8.6 Latch Circuit                           31
       8.7 Standby Operation                       31




                                        2
                                   ! WARNING
This service information is designed for experienced repair technicians only and is not
designed for use by general public. It does not contain warnings or cautions to advise
non-technical individuals of potential dangers in attempting to service a product. Products
powered by electricity should be serviced or repaired only by experienced professional
technicians. Any attempt to service or repair the product or products dealt with in this
service information by anyone else could result in serious injury or death.




Introduction
        We at Panasonic realise that the service engineer needs to understand the circuitry
inside the TV and for this need, we have produced this Technical Guide.

       This Technical Guide contains information for GP 31 chassis and should be used
in conjunction with the relevant Service Manuals for this chassis.

       As the Technical Guide for the GP 31 chassis covers such a wide range of models,
some differences may occur in circuit descriptions and component references.




                                            3
       Location of Control & Circuit Boards




                                              L-Board




A- Board




     Board Name               Function
       A-Board               Main Board
       L-Board               CRT Board




                      4
GP-31 Chassis Block Diagram




             5
1.     Tuning Circuit
Outline




                                          Fig 1.0

       The tuner is designed for reception of the conventional frequencies to date and the
intermediate special channel frequencies. The IF stage of the tuner contains the video and
audio demodulators which are designed for most widely used TV standards.


1.1    Signal Processing
1. The purpose of the tuner is to convert the VHF/ UHF TV broadcast signal (RF) into
   intermediate frequency signal, IF (38.0MHz) [Fig 1.0].
2. The aerial intercepts the TV signal and amplified by the RF amplifier.
3. The local oscillator generates basic frequency to convert RF signal into IF signal
   (intermediate signal) in the mixer.
4. Here the IF signals is output to UOC IC601 for video and sound processing.


1.2    IF Control
       Control of internal Tuner-IF processing is performed by the UOC IC601, the
IC601 sending control information via I

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