BBK AV225T free download

File name Bbk-AV225T rec.pdf

AV225T service manual Catalog Chapter One About Maintenance 1 1.1 Safety precautions 1 1.1.1 Power supply 1 1.1.2 Precautions for antistatic 1 1.1.3 About placement position 2 1.2 Maintenance method 2 1.2.1 Visualized method 2 1.2.2 Electric resistance method 2 1.2.4 Current method 2 1.2.5 Cutting method 2 1.2.4Currentmethod 2 1.2.5Cuttingmethod 2 1.2.6 Element substitution method 3 1.2.7 Comparison method 3 1.3 Required device for maintenance 3 Chapter Two Operation Instructions 4 2.1 Control button locations and explanations 4 2.1.1 Front panel illustratlons 5 2.1.2 Rear panel illustration 5 2.1.3 illustrations to the 5 2.2 Basic operations remote control 6 2.2.1 Turn on/off this unit 6 2.2.2 O tp function 6 2.2.3 Select Input Sound Source 7 2.2.4 Bass Enhancer 7 2.2.5 Select Sound Field 8 2.2.6 Adjust Volume 9 2.2.7 Adjust Level 9 2.2.8 EQ function 10 2.2.9 Parameter Processing 11 2.2.10 Adjust Karaoke 12 2.2.11 Tuning Function 13 2.2.12 Other Operations 15 Chapter Three Principle and Servicing 17 Section One Principle of the Player 17 3.1.1 Composition of the player 17 3.1.2 Function and features 17 3.1.3 Player block diagram 18 3.1.4 The player signal flow chart 19 Section Two Unit Circuit Principle 20 3.2.1 Volume board circuit 20 3.2.2 Signal processing board circuit 23 3.2.3 MCU board circuit 25 3.2.4 Control panel circuit 29 3.2.5 Power board circuit 30 3.2.6 Power amplifier board and protection circuit 31 3.2.7 MIC, headphone board 34 3.2.8 Video in/out board circuit 34 Section Three Servicing Cases 36 3.3.1 Servicing instances 36 3.3.2 Troubleshooting process 41 Section Four Servicing Parameters