Laney_CA3000_Service_Manual电路图.pdf

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1、CA3000CA3000 Power Amplifer Service Information Laneywww.laney.co.uk RadioFans.CN 收音机爱 好者资料库 SystemDiagram RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 CA Series Power Amplifiers D:RSTMISCCA Series Ampifers THD measurement.doc Created by R&D3 On 07/11/00Page 1/1 Traditionally, Class A and Class A

2、-B amplifiers have dominated the amplifier marketplace. These purely analogue devices have low power efficiency and most integrated circuit Class A-B amplifiers fall short of true high-fidelity audio quality. Class D amplifiers however, solve the efficiency problem by using switching pulse-width mod

3、ulation technology. However, this produces audio quality that is far inferior to class A or AB, so efficiency is gained at the expense of audio fidelity. The Holy Grail of amplification: High audio quality AND high power efficiency has long eluded the market. Enter the CA range of power amplifiers d

4、elivering audiophile performance and very high efficiency. If you have measured the output waveforms of CA amplifiers using traditional equipment and methods, you may have observed an unusual characteristic in the output waveform when the amplifier is driven close its maximum output. This characteri

5、stic appears to be a high frequency oscillation near the waveform peaks. In reality, this apparent oscillation is an audio quality enhancement characteristic of the CA amplifier. The apparent oscillations are well outside the audio bandwidth, and are a unique feature of the digital power processor.

6、No Filtering on output As the input signal, to any conventional amplifier is increased, at some point the output of the amplifier will distort/clip i.e. Square off. This is bad news because the for a split second the loudspeaker is not moving at all but still dissipating potentially huge power level

7、s, this is the main cause of (expensive) compression driver failure. When the CA power amplifier goes into this distortion region, it exhibits high frequency break-up of the peaks as shown above. This is actually the amplifier resetting the control processor overloads at a frequency far above the au

8、dible range. This is not instability or oscillation, nor does it degrade the performance of the amplifier in any way. In addition the CA series power amplifiers also have the ability to run almost rail-to-rail, and thus will not lose negative feedback. In other words, it will retain control of the l

9、oad at all times. Measurement of THD%+N Unless your distortion analyser is designed to reject out of band noise when measuring THD (And very few are), the THD measurement actually reflects harmonic distortion plus any noise present up to the bandwidth of the analyser and so is actually a measurement

10、 of THD+N. Since the CA range of amplifiers have energy far outside the audible frequency range (As do inferior class D amplifiers), a test designed for linear amplifiers (such as class A, AB) will not yield valid results when applied to a CA amplifier. A sharp cut-off low-pass filter must be insert

11、ed between the amplifiers outputs and the test equipments inputs prior to making any distortion measurements. Some measurement equipment (Such as Audio Precision2) have high quality low pass filters which can be used to limit the test bandwidth. Using these filters (as shown below) you will achieve

12、what looks like a high quality linear amplifier. Even though there appears to be lots going on outside the audio bandwidth, the CA amplifier is designed to be well within current and future EMC guidelines, and as such is quieter than most linear amplifiers. Output with 30Khz Low-pass filter CA3000 1

13、0462 CA3000 CARTON 1 10702SPECIAL MAINS LEAD1 10959CA SERIES MANUAL1 7915/6 CA3000 CHASSIS ASSY 1 1 CA3000 7915(/6) CA3000 CHASSIS ASSY 1 -00202210000UF 100V CAPACITOR/SAM4 -002204680NF 250V 22.9mm6 -005077M3x25MM HEX SPACER4 -005321 3A THERMAL RELEASE SWITCH 2 (-005324 5A THERMAL RELEASE SWITCH 2)

14、-005323 6A FILTERED MAINS INLET (1/2) -0055103MM SOLDER TAG2 -0055115MM SOLDER TAG12 -0055126mm SOLDER TAG4 -005558100mm TIE WRAP30 -005612M3*8 METAL SPACER2 -005632M3*20 PLASTIC SPACER HEX4 -005659SHORT BOARD SPACER 12.7MM4 -005666RED P402 KNOB4 -007906B1/CA OUTPUT ASSY PCB 9333-2 -0091503mm HEX NU

15、T2 -0091513mm INT SHAKEPROOF4 -0091523*5mm PAN POZI8 -0091604mm HEX NUT27 -0091614mm INT. SHAKEPROOF27 -0091624*12mm PAN POZI16 -0091674*8 PAN POZI TAPTE8 -009171M5 INT SHAKEPROOF8 -0091735*12mm PAN POZI1 -0091815mm BRASS HEX NUT1 -009183WASHER 10MM O/D X 3 1/2MM4 -0091906 WAY END CONNECTOR8 -009199

16、3 WAY IDC CONNECTOR12 -009200NO 6*3/8 FLANGE POZI24 -009204NO 4*1/4 PLASTITE20 -0092174mm NUTSERT14 -0092283*12 ZINC PAN POZI2 -0092354 X 3/8 PAN POZI AB BLK PO6 -52203235A BRIDGE RECTIFIER2 -530027DPST EQ MAINS SWITCH2 -540038EARTH WARNING LABEL1 -541004HC25/50 4.8 FASTON34 -5410531/4 LG RECEPTACLE

17、35 -541071POZI LOCK NYLON BOOT30 -5810013*6mm PAN POZI Z/B10 -5820054*25 PAN POZI18 -5820074*10mm SMALL F/H12 -586002M8 * 60 ROOFING BOLT2 -5860238mm SHKPRF WASHER2 -589020S/A SQUARE RUBBER FOOT20MM4 -58904150mm CAPACITOR CLAMP4 -5P-50036MX500 CAP STRAP-2 -79052ALUMINIUM SHEET0.006 -8P-506875MM CA H

18、EATSINK EXT-4 -8P-5073CA3000 RACK WING-2 -8P-5074CA3000 FAC1A-1 -8P-5075CA3000 REAR PANEL-1 -8P-5076CA3000 FACIA TRIM DRG 3151-1 -005320CHASSIS MOUNT MAINS FILTER2 CA3000 -8P-5077CA3000 LID DRG 3158-1 -8P-9256CA SERIES HANDLE DWG 3128-2 -8P-9257CA SERIES HANDLE SPACER2 -8P-9259CA3000 TRIP MOUNTING B

19、RACK-1 -8T-6148ACA3000 MAINS TX + CRIMPS 2-2 CA3000 -007906B1/CA OUTPUT ASSY PCB 9333-2 -00106733R 6W(5W)4 -0010685R6 1W 5% WW RESISTOR8 -001069OR01 2W5 5% WIREWOUND RESI8 -00107018KSM 1206 1% RESISTOR4 -001300ORO SHORTING LINK4 -00130247R 5% RESISTOR2 -00130610K 5% RESISTOR22 -0013091M 5% RESISTOR8

20、 -0013124K7 5% RESISTOR8 -00131547K 5% RESISTOR6 -0013186K8 5% RESISTOR2 -0013271K 5% RESISTOR4 -00140010K 1W RESISTOR2 -0015111K 2.5W RESISTOR4 -001705680R 5W RESISTOR2 -001920ZERO OHM RESISTOR2 -00200447UF 50V RADIAL8 -0020091000UF 25V RADIAL6 -00201310UF 50V CAPACITOR2 -002014100UF 35V RADIAL2 -0

21、020251UF 63V RADIAL4 -002029220UF 25V CAPACITOR2 -002035100N 100V 5MM BOX POLY12 -002036100UF 100V RADIAL CAP4 -002039220N 250V POLYPROPYLENE CA4 -002041100N 250V 5MM POLYESTER CA4 -0020421u63V 10% POLYESTER CAP4 -002410100NF 400V 15MM4 -002419100NF 63V 5mm16 -00281847PF 500V CERAMIC4 -0030001N4007

22、DIODE12 -0030073V9 .5W ZENER DIODE4 -00301415V 1.3W ZENER2 -0030171.5A 200V BRIDGE2 -00301810V .5W ZENER DIODE2 -0030223mm GREEN LED4 -0030415MM FERRITE BEAD10 -003042BYW100-200-FAST RECOVERY D8 -003411MPSA42/43 TRANSISTOR4 -003422STW38NB20 N CHANNEL MOSFET8 -003423TA0104A TRIPATH DIGITAL AM2 -00342

23、4LM7812 12V REGULATOR2 -003500BAS16 DIODE14 -003503BC847B TRANSISTOR6 -003504BC857B TRANSISTOR2 -00350834072 IC (SMD TL072)2 -003610TIP31C TRANSISTOR4 -0039017815 IC VOLTREGULATOR2 -0039027915 IC VOLTREGULATOR2 -0039057805 IC2 -00401910K HORIZ PRESET4 -005030HEATSINK TV56 -0050366 WAY LOCKING HEADER

24、2 CA3000 -007909CA SERIES INPUT PCB 9339 A-2 -00107122K 1206 1% RESISTOR12 -00107239K 1206 1% RESISTOR4 -001300ORO SHORTING LINK22 -001303100R 5% RESISTOR4 -0013271K 5% RESISTOR4 -001920ZERO OHM RESISTOR4 -00192356KSM 1206 1% RESISTOR4 -00192410KSM 1206 1% RESISTOR24 -00201310UF 50V CAPACITOR16 -002

25、419100NF 63V 5mm12 -00260247PF 50V 10% COG2 -002603100PF 50V 10% COG4 -002605470PF 50V 10% COG4 -0030343mm LED YELLOW4 -0030415MM FERRITE BEAD8 -003500BAS16 DIODE24 -003509MC33078 IC8 -0039017815 IC VOLTREGULATOR2 -0039027915 IC VOLTREGULATOR2 -00401910K HORIZ PRESET4 -005003STEREO JACK SOCKET4 -005

26、030HEATSINK TV54 -0050366 WAY LOCKING HEADER4 -005054XLR SOCKET FEMALE4 -0050633 WAY LOCKING HEADER6 -0050653 WAY NON LOCKING4 -0056102 POLE 2 WAY (MX)2 -0091993 WAY IDC CONNECTOR2 -009339PCB ISSUE 22 -5300234P 3W SLIDE SWITCH2 -543508SHORTING LINK (IDC)4 CA3000 -007971PCB 9342-VU ASSY-1 -0010031K .

27、25W RESISTOR1 -0010052K2 .25W RESISTOR1 -00101410K .25W RESISTOR1 -001300ORO SHORTING LINK3 -0013052K2 5% RESISTOR1 -00130610K 5% RESISTOR5 -001311470R 5% RESISTOR4 -0013271K 5% RESISTOR7 -001920ZERO OHM RESISTOR3 -00201310UF 50V CAPACITOR4 -00240122NF 400V 10MM4 -002402220NF 250V 15MM DIPPED POL4 -

28、0030115V1 .5W ZENER DIODE1 -0030223mm GREEN LED13 -003031SURGE GUARD SCK20-10-8A2 -0030333mm LED RED8 -0030343mm LED YELLOW4 -003503BC847B TRANSISTOR2 -003805LB1413 BARGRAPH DRIVER4 -00401910K HORIZ PRESET4 -004110B10K 27.5MM POT4 -0050366 WAY LOCKING HEADER2 -00504716A 24V RELAY2 -0050653 WAY NON LOCKING4 -0056864.8MM TERMINAL SPADE10 -009342CA3000 VU/SS ARRAY PCB1 -57101410 TURN CHOKE4 -530066SPEAKON SOCKET6