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Summary of Contents for BBK AV210
- Page 1 ENGLISH AV210 SERVICE MANUAL...
- Page 2 Echo IC Pt2399 AUTIONS There is high voltage inside this unit. Make sure to pull out the plug of this unit before repairing! There are many high voltage components inside this unit. Please pay attention to all warnings and instructions marked on this unit to avoid electric shock! Specifications of the replaced components must be the same as that of the original components.
- Page 3 C i r c u i t M a k e u p 1. INPUT PART AV210 has three ways of the analog audio source input and one group of 5.1 channel input jacks. Their switch is realized by the electronic switch. The circuit incorporates two kinds of electronic switch IC: CD4052 (dual channel one out of four electronic analog switch) and Cd4053 (trio channel one out of two electronic analog switch).
- Page 4 1.2.1 Hi-Fi Processing Mode: The signal flow is the same as that of the standard stereo mode. The electronic volume adjusting IC N402 shut off other audio channels under the control of the CPU. Neither the sound fields processing and balance adjustment can be performed.
- Page 5 Volume adjustment, sound field processing and EQ adjustment ¢ó T H E E X P L A N A T I O N F O R K E Y C O M P O N E N T S C P U I C W 7 8 E 5 4 circuits.
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Page 6: Control Circuit
3.2 Spectrum Sampling Amplification Circuit: The routes carrying the five-channel signals sent from the IC N402 are connected to the sampling resistors R494, R495, R496, R565 and R566 respetively.(The SW channel sends out the signals directly.) After being mixed by these resistors, the signals reach N406A to be amplified. The incurred spectrum analyzing signal source is sent to the front panel circuit. - Page 7 4.3 Spectrum analyzing circuit (The flow chart is shown an Figure 2) 7-band Filter N417B 35HZ N419 DISPLAY 100HZ CD4051 300HZ N416 1KHZ CD4051 Automatic 3KHZ Spectrum Frequency Gain 10KHZ Selected Adjustment 16KHZ N420B CPU Pin 12 V437 N420A V436 CPU Pin 1 V435 A/D Conversion...
- Page 8 SCHEMATIC DIAGRAM OF THE MAIN AMP BOARD 4.3.2 Frequency Selected Circuit The signal amplified by the N417B is coupled by C508 and then sent to the 7-band filter composed of the operational amplifiers. Setting its feedback capacitor's capacity can define the corresponding frequency amplitude. The frequency value marked on their output points is the frequency band's central frequency.
- Page 9 SRQ401 the above circuit working process: An analog series of DC level which has concrete LARGE 267.5×91×70 AV210 RADIATOR CONNECTED TO THE MAIN AMPLIFICATION BOARD voltage value originally becomes two mode of 0 and 1. Its time period represents the...
- Page 10 N401 109 IC M62446FP SOP N402 110 IC 24C02 DIP N421 111 I C LM1875T T05B N413,N414,N415 SOFTWARE CPU-AV210(RU)-0 N422 PROGRAM CPU CRYSTAL 12.00MHz 49-U G601 OSCILLATOR 114 RELAY JH1806-012-(3H1 £ « 1Z1) DC12V Y402 115 RELAY JH4237-012-2H DC12V Y401...
- Page 11 5.2 Echo Process Section The flow chart is shown as Figure 6. The front section signal is divided into three lines: PORCELAIN One line is sent by R980 and C958 to N403B's opposite-phase end. This line is just the C521,C522 50V 683 ±10 £...
- Page 12 6. Power Amplification and Protection Circuit CD11 25V220U±20%8×12 3.5 C415,C416 CD11 35V470U±20%10×20 5 C423,C424 6.1. Channels L&R Power Amplification Circuit: The L&R power amplifier employs CD11 50V1U±20%5×11 2 C411,C412 separate components. Taking the L channel as an example, its construction is shown CD11 50V10U±20%5×11 2 C435,C436,C437,C438,C417 CD11 35V47U±20%6×12 2.5...
- Page 13 6.3 Protection circuit: This unit incorporates the power-saving function. The L/R 2. THE MAIN AMP PART channel's protection is performed by cutting off the relay Y401 to cut off the 3 ¡À 6 V p o w e r MAIN PARTS LIST OF THE MAIN AMP BOARD s u p p l y w h e n t h i s u n i t i s g e t t i n g s t a r t e d .
- Page 14 6.3.4 Over-current short circuit protection: An over-current resistor sampling triode is parallel connected to the output load resistor of the channels L&R respectively. The channel L's sampling tube is V426 and its load resistor is R424 and R425. Another three channel power amplification IC have over-current protection function.
- Page 15 PORCELAIN 50V 82P ±10% 2.5mm C916,C918,C921,C925 CAPACITOR SCHEMATIC DIAGRAM OF THE FRONT CONTROL PANEL BOARD PORCELAIN 50V 221 ±10% 2.5mm C959,C960,C961 CAPACITOR PORCELAIN 50V 561 ±10% 2.5mm C929,C934 CAPACITOR PORCELAIN 50V 103 ±20% 2.5mm C906,C907,C909,C910,C951,C952,C931 CAPACITOR PORCELAIN 50V 562 ±20% 2.5mm C930,C935 CAPACITOR PORCELAIN...
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