Onkyo-SKSHT-320-Service-Manual(1) 电路图 维修手册.pdf

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1、SKS-HT320 SERVICE MANUALSERVICE MANUAL 5.1-CH HOME THEATER SPEAKER PACKAGE Silver model MODEL SKS-HT320(S) 120 V AC, 60HzSMDD Ref. No. 3846 092004 Front Speakers (L / R) SKF-320F Center Speaker SKC-320C Surround Speakers (L / R) SKM-320S Powered Subwoofer SKW-320X SAFETY-RELATED COMPONENT WARNING! C

2、OMPONENTS IDENTIFIED BY MARK ON THE SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE THESE COMPONENTS WITH ONKYO PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL. MAKE LEAKAGE-CURRENT OR RESISTANCE MEASUREMENTS TO DETERMINE THAT EXPOSED PARTS A

3、RE ACCEPTABLY INSULATED FROM THE SUPPLY CIRCUIT BEFORE RETURNING THE APPLIANCE TO THE CUSTOMER. RadioFans.CN 收音机爱 好者资料库 SKS-HT320 SPECIFICATIONS Type : Input sensitivity / impedance : Maximum output power : Frequency response : Cabinet capacity : Dimensions (W x H x D) : Weight : Speaker unit : Powe

4、r supply : Power consumption : Other : Powered Bass-reflex 220 mV / 15 k ohm 100 W (Dynamic Power) 35 Hz - 150 Hz 0.91 cubic feet (26 Litter) 9-1/16 x 17-13/16 x 15-7/8 inch (230 x 436 x 404 mm) 24.7 lbs. (11.2 kg) 8 inch Cone AC 120 V, 60 Hz 75 W Auto-Standby function Front Speaker (SKF-320F) Type

5、: Impedance : Maximum input power : Output sound pressure level : Frequency response : Crossover frequency : Cabinet capacity : Dimensions (W x H x D) : Weight : Speaker unit : Woofer : Tweeter : Terminal : Other : 2 Way Bass-reflex 8 ohm 100 W 76 dB/W/m 70 Hz - 50 kHz 4.5 kHz 0.035 cubic feet (1.0

6、Litter) 4 x 6-5/8 x 4-15/16 inch (101 x 169 x 126 mm) 2.6 lbs. (1.2 kg) 3-1/8 inch Cone 1 inch Balanced Dome Spring type Color coded Magnetic shielding Type : Impedance : Maximum input power : Output sound pressure level : Frequency response : Crossover frequency : Cabinet capacity : Dimensions (W x

7、 H x D) : Weight : Speaker unit : Woofer Tweeter Terminal : Other : 2 Way Bass-reflex 8 ohm 100 W 78 dB/W/m 70 Hz - 50 kHz 4.5 kHz 0.057 cubic feet (1.6 Litter) 10-3/8 x 4 x 4-15/16 inch (264 x 101 x 126 mm) 4.4 lbs. (2.0 kg) 3-1/8 inch Cone x 2 1 inch Balanced Dome Spring type Color coded Magnetic

8、shielding Surround Speaker (SKM-320S) Type : Impedance : Maximum input power : Output sound pressure level : Frequency response : Crossover frequency : Cabinet capacity : Dimensions (W x H x D) : Weight : Speaker unit : Woofer : Tweeter : Terminal : 2 Way Bass-reflex 8 ohm 100 W 79 dB/W/m 70 Hz - 30

9、 kHz 10 kHz 0.035 cubic feet (1.0 Litter) 4 x 6-5/8 x 4-15/16 inch (101 x 169 x 126 mm) 1.8 lbs. (0.8 kg) 3-1/8 inch Cone Woofer 3/4 inch Ceramic Tweeter Spring type Color coded Specifications and appearance are subject to change without prior notice. Powered Subwoofer (SKW-320X)Center Speaker (SKC-

10、320C) RadioFans.CN 收音机爱 好者资料库 SKS-HT320 EXPLODED VIEWS-1 SKW-320X : POWERED SUBWOOFER SKS-HT320 A02 SP06 x 10 pcs. A05 x 4 pcs. A04 F903 A03 U02 U03 F902 A01 U01 IC501- Refer to PRINTED CIRCUIT BOARD PARTS LIST Refer to EXPLODED VIEWS-2 RadioFans.CN 收音机爱 好者资料库 SKS-HT320 EXPLODED VIEWS-2 SKW-320X : P

11、OWERED SUBWOOFER SKS-HT320 SP06 x 8 pcs. SP08 SP04 SP01 SP03 SP05 x 8 pcs. SP02 x 4 pcs. SKS-HT320 SKS-HT320 EXPLODED VIEWS-3 SKF-320F / SKC-320C / SKM-320S SP13 SP10SP12 SP17SP19 SP16SP18 SP14 SP15 SP11 SKF-320F (L)SKF-320F (R) SKC-320C SKM-320S (R)SKM-320S (L) TERMINAL : White / Black TERMINAL : R

12、ed / Black TERMINAL : Green / Black TERMINAL : Blue / Black TERMINAL : Gray / Black NOT MAGNETICALLY SHIELDEDNOT MAGNETICALLY SHIELDED HTP-320 BLOCK DIAGRAM SKW-320 : POWERED SUBWOOFER HTP-320 HTP-8230 SCHEMATIC DIAGRAM SKW-320: POWERED SUBWOOFER HT-320FGH LINE INPUT OUTPUT LEVEL AC 120V / 60Hz SPEA

13、KER INPUT PC BOARDU02MAIN PC BOARDU01VR / LED PC BOARDU03 LED RED : STANDBY GREEN : ON HTP-320 SCHEMATIC DIAGRAM SKW-8230 : POWERED SUBWOOFER HTP-8230 A 1 2 3 4 5 BCDEFGH LINE INPUT OUTPUT LEVEL AC 120V / 60Hz SPEAKER INPUT PC BOARDU02MAIN PC BOARDU01VR / LED PC BOARDU03 LED RED : STANDBY GREEN : ON

14、 HTP-320 SCHEMATIC DIAGRAM SKW-320: POWERED SUBWOOFER A 1 2 3 4 5 BCDEFGH LINE INPUT OUTPUT LEVEL AC 120V / 60Hz SPEAKER INPUT PC BOARDU02MAIN PC BOARDU01VR / LED PC BOARDU03 LED RED : STANDBY GREEN : ON HTP320 PC BOARD CONNECTION DIAGRAM SKW-320 : POWERED SUBWOOFER HTP-320 MAIN PC BOARD VR / LED PC

15、 BOARD INPUT PC BOARD HTP-320 PRINTED CIRCUIT BOARD VIEW SKW-320POWERED SUBWOOFER A 1 2 3 4 5 BCD INPUT PC BOARDU02 MAIN PC BOARDU01 VR / LED PC BOARDU03 No PC board view Look over the actual PC board on hand TDA7293 120V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY VERY HIGH OPERATING VOLTAGE RANGE

16、(50V) DMOS POWER STAGE HIGH OUTPUT POWER (100W THD = 10%, RL = 8, VS = 40V) MUTING/STAND-BY FUNCTIONS NO SWITCH ON/OFF NOISE VERY LOW DISTORTION VERY LOW NOISE SHORT CIRCUIT PROTECTED (WITH NO IN- PUT SIGNAL APPLIED) THERMAL SHUTDOWN CLIP DETECTOR MODULARITY (MORE DEVICES CAN BE EASILY CONNECTED IN

17、PARALLEL TO DRIVE VERY LOW IMPEDANCES) DESCRIPTION The TDA7293 is a monolithic integrated circuit in Multiwatt15 package, intended for use as audio class AB amplifier in Hi-Fi field applications (Home Stereo, self powered loudspeakers, Top- class TV). Thanks to the wide voltage range and to the high

18、 out current capability it is able to sup- ply the highest power into both 4 and 8 loads. The built in muting function with turn on delay simplifies the remote operation avoiding switching on-off noises. Parallel mode is made possible by connecting more device through of pin11. High output power can

19、 be delivered to very low impedance loads, so optimizing the thermal dissipation of the system. January 2003 IN-2 R2 680 C2 22F C1 470nF IN+ R1 22K 3 R3 22K - + MUTE STBY 4 VMUTE VSTBY 10 9 SGND MUTE STBY R4 22K THERMAL SHUTDOWN S/C PROTECTION R5 10K C3 10FC4 10F 1 STBY-GND C5 22F 713 14 6 158 -Vs-P

20、WVs BOOTSTRAP OUT +PWVs+Vs C9 100nFC8 1000F -Vs D97AU805A +Vs C7 100nFC6 1000F BUFFER DRIVER 11 BOOT LOADER 12 5 VCLIP CLIP DET (*) (*) see Application note (*) for SLAVE function (*) Figure 1: Typical Application and Test Circuit Multiwatt15V Multiwatt15H ORDERING NUMBERS: TDA7293V TDA7293HS MULTIP

21、OWER BCD TECHNOLOGY 1/15 ABSOLUTE MAXIMUM RATINGS SymbolParameterValueUnit VSSupply Voltage (No Signal)60V V1VSTAND-BY GND Voltage Referred to -VS (pin 8)90V V2Input Voltage (inverting) Referred to -VS 90V V2 - V3Maximum Differential Inputs30V V3Input Voltage (non inverting) Referred to -VS 90V V4Si

22、gnal GND Voltage Referred to -VS 90V V5Clip Detector Voltage Referred to -VS 120V V6Bootstrap Voltage Referred to -VS 120V V9Stand-by Voltage Referred to -VS 120V V10Mute Voltage Referred to -VS 120V V11Buffer Voltage Referred to -VS 120V V12Bootstrap Loader Voltage Referred to -VS 100V IOOutput Pea

23、k Current10A PtotPower Dissipation Tcase = 70C50W TopOperating Ambient Temperature Range0 to 70C Tstg, TjStorage and Junction Temperature150C 1 2 3 4 5 6 7 9 10 11 8 BUFFER DRIVER MUTE STAND-BY -VS (SIGNAL) +VS (SIGNAL) BOOTSTRAP CLIP AND SHORT CIRCUIT DETECTOR SIGNAL GROUND NON INVERTING INPUT INVE

24、RTING INPUT STAND-BY GND TAB CONNECTED TO PIN 8 13 14 15 12 -VS (POWER) OUT +VS (POWER) BOOTSTRAP LOADER D97AU806 PIN CONNECTION (Top view) THERMAL DATA SymbolDescriptionTypMaxUnit Rth j-caseThermal Resistance Junction-case11.5C/W TDA7293 2/15 ELECTRICAL CHARACTERISTICS (Refer to the Test Circuit VS

25、 = 40V, RL = 8, Rg = 50 ; Tamb = 25C, f = 1 kHz; unless otherwise specified). SymbolParameterTest ConditionMin.Typ.Max.Unit VSSupply Range1250V IqQuiescent Current50100mA IbInput Bias Current0.31A VOSInput Offset Voltage-1010mV IOSInput Offset Current0.2A PORMS Continuous Output Powerd = 1%: RL = 4;

26、 VS = 29V, 7580 80 W d = 10% RL = 4 ; VS = 29V 90100 100 W dTotal Harmonic Distortion (*)PO = 5W; f = 1kHz PO = 0.1 to 50W; f = 20Hz to 15kHz 0.005 0.1 % % ISCCurrent Limiter ThresholdVS 40V6.5A SRSlew Rate510V/s GVOpen Loop Voltage Gain80dB GVClosed Loop Voltage Gain (1)293031dB eNTotal Input Noise

27、A = curve f = 20Hz to 20kHz 1 310 V V RiInput Resistance 100k SVRSupply Voltage Rejectionf = 100Hz; Vripple = 0.5Vrms75dB TSThermal ProtectionDEVICE MUTED150C DEVICE SHUT DOWN160C STAND-BY FUNCTION (Ref: to pin 1) VST onStand-by on Threshold1.5V VST offStand-by off Threshold3.5V ATTst-byStand-by Att

28、enuation7090dB Iq st-byQuiescent Current Stand-by0.51mA MUTE FUNCTION (Ref: to pin 1) VMonMute on Threshold1.5V VMoffMute off Threshold3.5V ATTmuteMute AttenuatIon6080dB CLIP DETECTOR DutyDuty Cycle ( pin 5)THD = 1% ; RL = 10K to 5V10% THD = 10% ; RL = 10K to 5V 304050% ICLEAKPO = 50W3A SLAVE FUNCTI

29、ON pin 4 (Ref: to pin 8 -VS) VSlaveSlaveThreshold1V VMasterMaster Threshold3V Note (1): GVmin 26dB Note: Pin 11 only for modular connection. Max external load 1M/10 pF, only for test purpose Note (*): Tested with optimized Application Board (see fig. 2) TDA7293 3/15 Figure 2: Typical Application P.C

30、. Board and Component Layout (scale 1:1) TDA7293 4/15 APPLICATION SUGGESTIONS (see Test and Application Circuits of the Fig. 1) The recommended values of the external components are those shown on the application circuit of Fig- ure 1. Different values can be used; the following table can help the d

31、esigner. COMPONENTSSUGGESTED VALUEPURPOSE LARGER THAN SUGGESTED SMALLER THAN SUGGESTED R1 (*)22kINPUT RESISTANCEINCREASE INPUT IMPEDANCE DECREASE INPUT IMPEDANCE R2680CLOSED LOOP GAIN SET TO 30dB (*) DECREASE OF GAININCREASE OF GAIN R3 (*)22kINCREASE OF GAINDECREASE OF GAIN R422kST-BY TIME CONSTANT

32、LARGER ST-BY ON/OFF TIME SMALLER ST-BY ON/OFF TIME; POP NOISE R510kMUTE TIME CONSTANT LARGER MUTE ON/OFF TIME SMALLER MUTE ON/OFF TIME C10.47FINPUT DC DECOUPLING HIGHER LOW FREQUENCY CUTOFF C222FFEEDBACK DC DECOUPLING HIGHER LOW FREQUENCY CUTOFF C310FMUTE TIME CONSTANT LARGER MUTE ON/OFF TIME SMALLE

33、R MUTE ON/OFF TIME C410FST-BY TIME CONSTANT LARGER ST-BY ON/OFF TIME SMALLER ST-BY ON/OFF TIME; POP NOISE C522FXN (*)BOOTSTRAPPINGSIGNAL DEGRADATION AT LOW FREQUENCY C6, C81000FSUPPLY VOLTAGE BYPASS C7, C90.1FSUPPLY VOLTAGE BYPASS DANGER OF OSCILLATION (*) R1 = R3 for pop optimization (*) Closed Loo

34、p Gain has to be 26dB (*) Multiplay this value for the number of modular part connected MASTER UNDEFINED SLAVE -VS +3V -VS +1V -VS D98AU821 Slave function: pin 4 (Ref to pin 8 -VS) Note: If in the application, the speakers are connected via long wires, it is a good rule to add between the output and

35、 GND, a Boucherot Cell, in order to avoid dangerous spurious oscillations when the speakers terminal are shorted. The suggested Boucherot Resistor is 3.9/2W and the capacitor is 1F. TDA7293 5/15 INTRODUCTION In consumer electronics, an increasing demand has arisen for very high power monolithic audi

36、o amplifiers able to match, with a low cost, the per- formance obtained from the best discrete de- signs. The task of realizing this linear integrated circuit in conventional bipolar technology is made ex- tremely difficult by the occurence of 2nd break- down phoenomenon. It limits the safe operatin

37、g area (SOA) of the power devices, and, as a con- sequence, the maximum attainable output power, especially in presence of highly reactive loads. Moreover, full exploitation of the SOA translates into a substantial increase in circuit and layout complexity due to the need of sophisticated pro- tecti

38、on circuits. To overcome these substantial drawbacks, the use of power MOS devices, which are immune from secondary breakdown is highly desirable. The device described has therefore been devel- oped in a mixed bipolar-MOS high voltage tech- nology called BCDII 100/120. 1) Output Stage The main desig

39、n task in developping a power op- erational amplifier, independently of the technol- ogy used, is that of realization of the output stage. The solution shown as a principle shematic by Fig3 represents the DMOS unity - gain output buffer of the TDA7293. This large-signal, high-power buffer must be ca

40、- pable of handling extremely high current and volt- age levels while maintaining acceptably low har- monic distortion and good behaviour over frequency response; moreover, an accurate con- trol of quiescent current is required. A local linearizing feedback, provided by differen- tial amplifier A, i

41、s used to fullfil the above require- ments, allowing a simple and effective quiescent current setting. Proper biasing of the power output transistors alone is however not enough to guarantee the ab- sence of crossover distortion. While a linearization of the DC transfer charac- teristic of the stage

42、 is obtained, the dynamic be- haviour of the system must be taken into account. A significant aid in keeping the distortion contrib- uted by the final stage as low as possible is pro- vided by the compensation scheme, which ex- ploits the direct connection of the Miller capacitor at the amplifiers o

43、utput to introduce a local AC feedback path enclosing the output stage itself. 2) Protections In designing a power IC, particular attention must be reserved to the circuits devoted to protection of the device from short circuit or overload condi- tions. Due to the absence of the 2nd breakdown phe- n

44、omenon, the SOA of the power DMOS transis- tors is delimited only by a maximum dissipation curve dependent on the duration of the applied stimulus. In order to fully exploit the capabilities of the power transistors, the protection scheme imple- mented in this device combines a conventional SOA prot

45、ection circuit with a novel local tempera- ture sensing technique which dynamically con- trols the maximum dissipation. Figure 3: Principle Schematic of a DMOS unity-gain buffer. TDA7293 6/15 In addition to the overload protection described above, the device features a thermal shutdown circuit which

46、 initially puts the device into a muting state ( Tj = 150 oC) and then into stand-by ( Tj = 160 oC). Full protection against electrostatic discharges on every pin is included. 3) Other Features The device is provided with both stand-by and mute functions, independently driven by two CMOS logic compa

47、tible input pins. The circuits dedicated to the switching on and off of the amplifier have been carefully optimized to avoid any kind of uncontrolled audible transient at the output. The sequence that we recommend during the ON/OFF transients is shown by Figure 4. The application of figure 5 shows t

48、he possibility of using only one command for both st-by and mute functions. On both the pins, the maximum appli- cable range corresponds to the operating supply voltage. APPLICATION INFORMATION HIGH-EFFICIENCY Constraints of implementing high power solutions are the power dissipation and the size of

49、 the power supply. These are both due to the low effi- ciency of conventional AB class amplifier ap- proaches. Here below (figure 6) is described a circuit pro- posal for a high efficiency amplifier which can be adopted for both HI-FI and CAR-RADIO applica- tions. 1N4148 10K30K 20K 10F10F MUTESTBY D93AU014 MUTE/ ST-BY Figure 5: Single Signal ST-BY/MUTE Control Circuit PLAY OFF ST-BY MUTEMUTE ST-BYOFF D98AU817 5V 5V +Vs (V) +40 -40 VMUTE PIN #10 (V) VST-BY PIN #9 (V) -Vs VIN (mV) IQ (mA) VOUT (V) Figure 4: Turn ON/OFF Sugg