BBK-AV230-av-sm 电路图 维修手册.pdf

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1、Principle, Knowledge and Maintenance of AV230 (RU) Contents Chapter One Product Description Chapter Two Operating Principle Section One Structure Section Two Volume Board Section Three Signal Processing Board Section Four CPU Board Section Five Control Panel Section Six Voice Board Section Seven Pow

2、er Panel Section Eight Power Amplifier Board and Protection Circuit Chapter Three Maintenance Process RadioFans.CN 收音机爱 好者资料库 Chapter One Product Description AV230 (RU) is an intelligent premium power amplifier that adds touch button and voice navigation to its predecessor, allowing it to have a han

3、dsome and distinguished appearance as well as a complete man- machine interaction mode that facilitates user operation. Its main characteristics are as follows: 1. Built- in 5- channel power amplifier that can adapt to AC- 3/DTS and stereo music playback. 110W main channel and central surround sound

4、. 2. Mix of AC- 3/DTS, VCD and DVD. AUX input interface and super bass/stereo output interface. 3. 6- channel volume control and independent level control. 7- stage electronic balance. 4. Bass enhancer system, cyber logic, hi- fi playback. 5. One button for movie, music and karaoke. 6. Intelligent v

5、oice navigation. 7. Multiple electronic balance modes that adapt to different music styles. 8. Automatic spectrum analysis and compensation, automatic signal compensation. 9. Profile surround sound. Situation effect processing for AC- 3/DTS effect. 10. Multiple spectrum display modes. 11. Complete k

6、araoke function including microphone independent volume control, overall volume control, and voice compensation, delay and echo adjustment. 12. Karaoke wide sound field function. 13. Touch control function. 14. Intelligent protection upon overcurrent and over voltage. Chapter Two Operating Principle

7、 Section One Structure AV230 (RU) mainly consists of the following seven parts: I. Volume Board: select input of signal source, cyber logic, and bass enhancer control. II. Signal Processing Board: karaoke signal processing and 5.1- channel signal amplification. III. CPU Board: overall control, frequ

8、ency point gating, automatic search circuit. IV. Control Panel: VFD display, touch selection and backlight display. V. Voice Board: intelligent voice navigation system, operating mode indicated by voice VI. Power Panel and Protection Circuit: provide operating voltage required by element circuits an

9、d execute overall protection. RadioFans.CN 收音机爱 好者资料库 VII. Power Amplifier Board: power amplification of 5.1 channel signal or analog signal. Section Two V olume Board AV230(RU) has four input modes: AUX., VCD, DVD and 5.1 channel. The cyber logic function of AV230 (RU) is to get C/SR/SL/SW channel

10、signals by sampling from L/R channel and then processing through low- pass filter and adder subtractor. Mode switch is achieved using electronic analog switch. The signal flow chart is as follows: I. Input option and sound field processing mode The input option of AV230 (RU) is achieved via electron

11、ic switches CD4052 and CD4053, the truth tables of which are as follows: 5.1 channel input mode: Now A/B/5.1CH control pins of M62446 are of high level. L/R channel signal of 5.1 input is outputted from pin 3/13 of N101 and sent to IC N106 for N108B S- C CD 4053 electr onic switc h AUX CD4052 electr

12、on ic switch N101 51CH VCD DVD N106 M62446 R L CD 4053 electr onic switc N104A N104B N107B N105B N105A N107A SR S- C S- SR S- SL C SL SWIN SW DISPLY OUT RadioFans.CN 收音机爱 好者资料库 volume and tone control; meanwhile, C/SR/SL signal on 5.1 input terminal is respectively sent from pin 14/15/4 output of N4

13、10 to IC N106 for independent volume control. And SW signal is outputted via pin 4 of N103 and then send to M62446 after being amplified by N107A. Three analog input modes: AV230 (RU) totally has three analog input modes: AUX/VCD/DVD, which are controlled via A/B signal respectively (see details in

14、truth tables). AV230 (RU) totally has three sound field modes: standard sound field, cyber logic and Hi- Fi. 1. Standard sound field: Under overall CPU control, when bass enhancer is off, L/R channel output and subwoofer output are available; when bass enhancer is on, only L/R channel output is avai

15、lable. 2. Hi- fi: Under overall CPU control, only L/R channel output is available to M62446; 3. Cyber logic: Pin 9/10 of electronic switch N101 (CD4052) select a series of analog L/R channel input signals. N101 (CD4052) signals. L/R signals are outputted from pin 13/3 via the internal electronic swi

16、tch of N101, and divided into two ways. One way is respectively sent into pin 13/15 of M62446, for electronic volume and tone control. The other way produces SW/S- SR/S- SL/S- C signals via buffer, adder- subtractor and low- pass filter. SW/S- SR/S- SL signals are sent to pin 12/2/5 of N102. N102 se

17、lect synthesis and decoding signal input (see truth table of CD4053) from synthesis and decoding and 5.1CH signals, outputs C/SR/SL signals and sends into pin 11/8/9 of M62446 for volume control. Still another way of SW signal directly sends to pin 6 of M62446 after being outputted from N107A. 5.1CH

18、 signal sent into M62446 is outputted from pin 31- 36 after volume and tone control, and then outputted to signal board by XS20 power distributor. The relation between sound sources in input circuit and sound processing modes is as illustrated below. II. Control circuit Press “ input” key to select

19、Two analog 5.1 input mode Hi- fi mode Standard sound Cyber logic L/R channel output only. Sound filed and L/R/SW output only. Concert hall sound filed and balance setting 6- channel output. Theater sound filed and 6- channel output. Theater sound filed and Pin 23/26/27 of CPU (N100) output data, PVS

20、T and clock signal and send to pin 39/40/41 of M62446, controlling pin 1/2/3/4 of M62446 to output control level, so as to select input signal and spectrum sampling signal. It is worth noting that PVST signal is a latch control signal. When the data and clock of CPU is sent to M62446, an identificat

21、ion signal will be added, indicating that this signal can only be used by M62446 while other IC of I2C bus can not use current data and clock signal. III. Frequency spectrum sampling circuit Only S- C/S- SR/S- SL/SW signals are sampled during frequency spectrum sampling in AV230（RU）and added to pin

22、14 via a 150K sampling resistance. Another S- C synthesis and decoding signal is added to pin 1 of N103, called S- C. 5.1CH and LR- T of M62446select sampling signals. When synthesis and decoding is selected, the control signal of 5.1CH is of low level while pin 9/11 of N103 is of low level. Accordi

23、ng to the truth table, it is known that the outputs are X0/Z0. Sampling signal is grounded while LR- T is of H level. Select Y1, S- Csignal is outputted from pin 15 of N103 to N108B, adding to OK- R signal for the amplification of frequency spectrum signal, and then sent to frequency point gating an

24、d auto search circuits. Section Three Signal Processing Board The signal processing board superposes, mix and amplify 5.1- channel signal sent from the volume board, voice signal sent from the voice board and karaoke signal. I AV230（RU）Karaoke Circuit 1. Function: this circuit process human voice th

25、rough power amplifier and reproduce it via speaker. It includes human voice beautification circuit, wide sound field processing circuit, karaoke echo and delay regulating circuit. In addition, AV230 (RU) has a special circuit that enables 5 profiles without inserting microphone. 2. IC and its role f

26、or karaoke IC serial number Name of IC Role of IC N201 4558 Transmittal. Preamplification for karaoke signal N200 PT2315 Volume control of karaoke, including tone control N205 CD4053 Electronic switch N209 PT2399 Karaoke echo processing N207 CD4051 Karaoke delay adjustment N208 CD4051 Karaoke echo c

27、ontrol N204 4558 Phase inverter PT2315 function pin S/N Name of pin Description Remarks 1 REF Reference voltage (1/2VDD) 2 VDD Power supply 3 AGND Analog 4 TREB L 5 TREB R L/R channel treble control pins 6 RIN R channel input 7 LOUD- R R channel loudness control pin 9 LOUD- L L channel loudness cont

28、rol pin 11 LIN L channel input 12 BIN L 13 BOUT L L channel bass control input/output pin 14 BIN R 15 BOUT R R channel bass control input/output pin 16 RFOUT R channel output 17 LFOUT L channel output 18 DGND Digital 19 DATA （DATA）control data of sequence transmission (DATA) 20 LCK Clock input of se

29、quence transmission 8，10 NC Not connected 3. Flow chart of karaoke signal When the microphone is inserted, MIC signal is sent via MIC to the transmittal circuit combined by N201A and N201B for amplification. Amplified MIC signal gives CPU a MIC identification signal after N202A amplification, follow

30、ed by VD201 rectification and filtering control triode V200. CPU sends PKM signal, which is of low level, causing cutoff of triode V103/V105 and enabling output of MIC signal; another way reaches pin 6/11 of PT2315 after C219/C222 coupling, outputs from pin 16/17 after internal volume and tone contr

31、ol, mixed into one way and sent to N202B and then reversely send to N203B for amplification. Signals amplified by N203B are divided into two ways. One way is directly outputted. The other way is outputted from pin 14 after being coupled by R222/C247 to PT2399 for internal delayed reverberation adjus

32、tment, reversed by N204 and outputted by mixing with karaoke signal. While OK- R is outputted from pin 14 after being gated by N205 and superposed to L/R channel. In this circuit, the bass boost network made up of triode V201 connected to the negative terminal of N202B is primarily for bass boost of

33、 75HZ low frequency signal. During delay adjustment for PT2399, first control signal is given to CPU, which sends this control signal to N100 by data communication with voice processing IC (N100HT86P00, HT86384) , and then N100 will control N207 to connect to pin 6 of PT2399 by selecting different r

34、esistance values for purpose of delay adjustment. Echo control is to change the resistance value at the connection point to R229, so as to change the superposition on through connect signal for echo control. The wide sound field processing control signal of SOK s karaoke is in wide sound field mode

35、when it is of high level, when the signal of OK- R is the OK signal inverted by MIC N201 N200 N202B N203B N209 N204 N205 N207 N208 N100 Karaoke mixed N202A V200 CPU pass N204A. A sense signal of OK- SW on the MIC plug conducts MIC signal detection together with the network made up of V200. When MIC

36、is not plugged, it is of low signal; when plugged, it is of high signal. Karaoke auto mute is also available. When P- KT fails to detect signal for a continuous time, CPU will send a P- KM signal to mute karaoke and avoid MIC from receiving noise, which may affect sound effect. ? Signal flow chart o

37、f profiles AV230 (RU) has a special function that switching between 5 profiles is available without karaoke. Its flow chart is as follows: When pin 9/10 are of high level, sampled L/R/C signals are outputted via from pin 3 N205 gating, and sent to the internal of PT2399 after amplification by N203B

38、for reverberation delay adjustment (by HT86P00 and HT86384 for voice processing), and then superposed to L/R/C channel to form different profiles. In this circuit, MIC shall not be inserted and is only available in 5.1CH mode. N203A is for the purpose of reversal. II. Bass enhancer circuit P- BURST

39、is the switch signal of bass enhancer. When it is of high level and added to the base electrode of V102, V102 will be switched into conduction. When the collector electrode outputs low level, V107 will be cut off; when the collector electrode is of low level, V107 will also be cut off. SW signal is

40、normally outputted to external terminal. Meanwhile, the high level signal of P- BURST is added to the emitter electrode of V108. V108 is positively biased and switched into conduction. The collector electrode adds high level to the base electrode of V101. V101 is positively biased and switched into

41、conduction, and ground SW signal, not superposing it to L/R channel signal. In reverse, when P- BURST is of high level, V100 will be switched into conduction and SWM signal cannot be outputted from external terminal. Meanwhile, V101 is cut off and SW signal is superposed to L/R channel signal. HT86P

42、00 N205 N203B N209 N207 N208 N204 B Mixed output N204 A The bass enhancer of AV230 (RU) can be divided into three steps. This principle is to change the volume of bass enhancer by changing the SW output volume of M62446. Meanwhile, SWM signal is added to relay via XS9. When the relay is off, SW sign

43、al will be grounded, disabling the output at super bass port. III. Mixing and amplification circuit of 5.1 signal and karaoke After L/R channel signal of 5.1 signal is superposed with SW signal and amplified by N101B/N100B, it is sent to the reverse phases of N101A/N100A. Meanwhile, OK- R/OK- L sign

44、als are also respectively added to the reverse phases of N101A/N100A. After mixing and amplification by N101A/N100A, they are outputted respectively from pin 1 of N100A/N101A to power amplification circuit for power amplification. Meanwhile, the C- 1 signal sent by volume board is added to the rever

45、se phase of pin 6 of N102B and added to the reverse phase of N102A after amplification. Now C1- 1 signal after electronic reverberation processing is also added to the reverse phase of N102A and sent to power amplification circuit after mixing and amplification. SR- 1/SL- 1 of another volume board i

46、s also added to the reverse phases of N103B and N104B for amplification and then sent to N103A and N104A for further amplification, and later sent to power amplification circuit. One way of 5.1 signal being mixed and amplified is sent to power amplification circuit passing through XS9, and the other

47、 way forms DIST (distortion error detecting signal) signal passing through R111- R113/R142/R145/VD100- VD104, which will be added to CPU for automatic gain, so as to control volume output. IV. Voice channel test circuit N105 is a single pass 8- option electronic switch, 5 ports of which are used. Th

48、e voice signal of voice board sent by C127 and R155 to the reverse phase of NN108A for amplification, and then added to pin 3 of N105. The output terminal is changed by high/low control level of pin 9/10/11 (see the truth table above), enabling it to respectively add to the reverse phase of N100A/N101AN/102A/N103A/N104A as required by CPU, for mixing and amplification with 5.1 signal, so that speakers can produce corresponding sounds when being tested and thus determining if each speaker is normal. A B X0 X1 X2 X3 0 0 0 0 1 1 1 1 CD4051 Truth 0 0 X4 X5 X6 X7 1 0 1 1 0 1 C 0 0 0 0