Power Amplifer. Service Information. Laney.
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- Charla Harrington
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1 CA1500 Power Amplifer Service Information Laney
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11 CA Series Power Amplifiers Traditionally, Class A and Class A-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 modulation 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 delivering 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 characteristic 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. 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 levels, 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 audible 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 load 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 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 inserted between the amplifiers outputs and the test equipment s 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 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 D:\RST\MISC\CA Series Ampifers THD measurement.doc Created by R&D3 On 07/11/00 Page 1/1
12 CA1500E CA1500 EURO/UK 230V CA600/1500 CARTONS 1 SPECIAL MAINS LEAD 1 CA SERIES MANUAL CA1500 CHASSIS ASSY 230V 1 Page 1/6
13 CA1500E CA1500 EURO/UK 230V CA1500 CHASSIS ASSY 230V 1 -> M.25W RESISTOR 1 -> UF 100V CAPACITOR/SAM 2 -> NF 250V 22.9mm 3 -> A FILTERED MAINS INLET 1 -> CHASSIS MOUNT MAINS FILTER 1 -> A THERMAL RELEASE SWITCH 1 -> MM SOLDER TAG 1 -> MM SOLDER TAG 10 -> mm SOLDER TAG 3 -> mm TIE WRAP 20 -> M3*8 METAL SPACER 2 -> M3*20 PLASTIC SPACER HEX 4 -> SHORT BOARD SPACER 12.7MM 4 -> RED P402 KNOB 2 -> *5mm PAN POZI 4 -> mm HEX NUT 19 -> mm INT. SHAKEPROOF 26 -> *12mm PAN POZI 2 -> *20mm PAN POZI 6 -> *8 PAN POZI TAPTE 4 -> M5 INT SHAKEPROOF 2 -> *12mm PAN POZI 1 -> mm BRASS HEX NUT 1 -> WASHER 10MM O/D X 3 1/2MM 2 -> WAY END CONNECTOR 4 -> WAY IDC CONNECTOR 8 -> NO 6*3/8 FLANGE POZI 18 -> NO 4*1/4 PLASTITE 4 -> mm NUTSERT 18 -> X 3/8 PAN POZI AB BLK PO 6 -> A BRIDGE RECTIFIER 1 -> DPST EQ MAINS SWITCH 1 -> SPEAKON SOCKET 3 -> EARTH WARNING LABEL 1 -> HC25/ FASTON 8 -> /4" LG RECEPTACLE 17 -> POZI LOCK NYLON BOOT 16 -> *25 PAN POZI 4 -> *10mm SMALL F/H 8 -> M8 * 60 ROOFING BOLT 1 -> mm SHKPRF WASHER 1 -> POP RIVET (BLACK) 6 -> S/A SQUARE RUBBER FOOT 4 -> mm CAPACITOR CLAMP 2 ->5P MX500 CAP STRAP 1 ->8P-5063 CA1500 SUB FACIA DWG >8P-5064 CA1500/600 TRIM FACIA DWG 1 ->8P-5065 CA1500/600 CHASSIS DWG >8P-5067 CA1500/600C CHASSIS PARTIT 1 ->8P MM CA HEATSINK EXT 4 ->8P-5069 CA1500/600 LID DWG 1 ->8P-9250 CA1500/600 REAR DWG >8P-9255 CA SERIES RACK WINGS DWG 2 ->8P-9256 CA SERIES HANDLE DWG >8P-9257 CA SERIES HANDLE SPACER 2 ->8P-9258 CA SERIES FUSE BRACKET DW 1 ->->8T-6143 CA1500/3000 MAINS TX 115/2 1 Page 2/6
14 CA1500E CA1500 EURO/UK 230V -> B1/CA OUTPUT ASSY PCB >-> R6 1W 5% WW RESISTOR 4 ->-> OR01 2W5 5% WIREWOUND RES 4 ->-> KSM % RESISTOR 2 ->-> R 2W5 5% RESISTOR 2 ->-> ORO SHORTING LINK 2 ->-> R 5% RESISTOR 1 ->-> K2 5% RESISTOR 1 ->-> K 5% RESISTOR 11 ->-> M 5% RESISTOR 4 ->-> K7 5% RESISTOR 4 ->-> K 5% RESISTOR 3 ->-> K8 5% RESISTOR 1 ->-> K 5% RESISTOR 2 ->-> K 1W RESISTOR 1 ->-> K 2.5W RESISTOR 2 ->-> R 5W RESISTOR 1 ->-> ZERO OHM RESISTOR 1 ->-> UF 50V RADIAL 4 ->-> UF 25V RADIAL 3 ->-> UF 50V CAPACITOR 1 ->-> UF 35V RADIAL 1 ->-> UF 63V RADIAL 3 ->-> UF 25V CAPACITOR 1 ->-> N 100V 5MM BOX POLY 6 ->-> UF 100V RADIAL CAP 2 ->-> N 250V POLYPROPYLENE CA 2 ->-> N 250V 5MM POLYESTER CA 2 ->-> NF 400V 15MM 2 ->-> NF 63V 5mm 8 ->-> PF 500V CERAMIC 2 ->-> N4007 DIODE 6 ->-> V9.5W ZENER DIODE 2 ->-> V 1.3W ZENER 1 ->-> A 200V BRIDGE 1 ->-> V.5W ZENER DIODE 1 ->-> mm GREEN LED 2 ->-> MM FERRITE BEAD 5 ->-> BYW FAST RECOVERY D 4 ->-> MPSA42/43 TRANSISTOR 2 ->-> STW38NB20 N CHANNEL 4 ->-> TA0104A TRIPATH DIGITAL AM 2 ->-> LM V REGULATOR 1 ->-> BAS16 DIODE 7 ->-> BC847B TRANSISTOR 3 ->-> BC857B TRANSISTOR 1 ->-> IC (SMD TL072) 1 ->-> TIP31C TRANSISTOR 2 ->-> IC VOLT'REGULATOR 1 ->-> IC VOLT'REGULATOR 1 ->-> IC 1 ->-> K HORIZ PRESET 2 ->-> HEATSINK TV5 3 ->-> WAY LOCKING HEADER 1 ->-> /4" SPADE TERMINAL 7 ->-> WAY LOCKING HEADER 3 ->-> MM TIE WRAP 1 ->-> A POLY SWITCH/MF-R >-> W PCB SOCKET 2 ->-> UH 20A INDUCTOR 2 ->-> W PCB SOCKET 2 ->-> ALUMINIUM OXIDE FET WASHER 4 Page 3/6
15 CA1500E CA1500 EURO/UK 230V ->-> mm TIE WRAP 2 ->-> A RELAY 2 ->-> MM TERMINAL SPADE 6 ->-> mm HEX NUT 7 ->-> mm INT SHAKEPROOF 7 ->-> CA/B1 DIGITAL OUTPUT PCB 1 ->-> SHORTING LINK (IDC) 2 ->-> *20mm PAN POZI 7 ->-> POP RIVET (BLACK) 3 ->-> M3*10mm HEX TAPPED 5 ->->8P-9243 CA/B1 OUTPUT TRAY DWG NO 1 ->->8P-5071 CA1500/600/B1 FET CLAMPING 2 Page 4/6
16 CA1500E CA1500 EURO/UK 230V -> CA SERIES INPUT PCB 9339 A -1 ->-> K % RESISTOR 2 ->-> K % RESISTOR 2 ->-> ORO SHORTING LINK 17 ->-> K 5% RESISTOR 2 ->-> ZERO OHM RESISTOR 2 ->-> KSM % RESISTOR 2 ->-> KSM % RESISTOR 12 ->-> UF 50V CAPACITOR 6 ->-> NF 63V 5mm 6 ->-> PF 50V 10% COG 2 ->-> PF 50V 10% COG 2 ->-> mm LED YELLOW 2 ->-> MM FERRITE BEAD 4 ->-> BAS16 DIODE 12 ->-> MC33078 IC 3 ->-> IC VOLT'REGULATOR 1 ->-> IC VOLT'REGULATOR 1 ->-> K HORIZ PRESET 2 ->-> STEREO JACK SOCKET 2 ->-> HEATSINK TV5 2 ->-> WAY LOCKING HEADER 2 ->-> XLR SOCKET FEMALE 2 ->-> WAY LOCKING HEADER 4 ->-> WAY NON LOCKING 2 ->-> LEDS SPACER 1 ->-> POLE 2 WAY (MX) 1 ->-> WAY IDC CONNECTOR 1 ->-> PCB ISSUE 2 1 ->-> P 3W SLIDE SWITCH 1 ->-> SHORTING LINK (IDC) 2 Page 5/6
17 CA1500E CA1500 EURO/UK 230V -> CA1500 PCB 9335 VU/SS/O/P -1 ->-> K.25W RESISTOR 1 ->-> ORO SHORTING LINK 1 ->-> K2 5% RESISTOR 2 ->-> K 5% RESISTOR 3 ->-> R 5% RESISTOR 2 ->-> K 5% RESISTOR 4 ->-> UF 50V CAPACITOR 2 ->-> NF 400V 10MM 2 ->-> NF 250V 15MM DIPPED POL 2 ->-> V1.5W ZENER DIODE 1 ->-> mm GREEN LED 7 ->-> SURGE GUARD SCK A 1 ->-> mm LED RED 4 ->-> BC847B TRANSISTOR 1 ->-> LB1413 BARGRAPH DRIVER 2 ->-> K VERTICAL PRESET 2 ->-> B10K 27.5MM POT 2 ->-> A 24V RELAY 1 ->-> WAY 90 DEGREE LOCKING HE 4 ->-> W 90o LOCKING HEADER 1 ->-> LED SPACER 12.7mm 2 ->-> MM TERMINAL SPADE 4 ->-> PCB ISSUE 3 1 ->-> SHORTING LINK (IDC) 2 ->-> TURN CHOKE 2 Page 6/6
18 CA1500US CA V CA600/1500 CARTONS SPECIAL MAINS LEAD CA SERIES MANUAL 1 Page 1/6
19 CA1500US CA V 7918 CA1500 CHASSIS ASSY 115V -1 -> M.25W RESISTOR 1 -> UF 100V CAPACITOR/SAM 2 -> NF 250V 22.9mm 3 -> AMP FILTERED MAINS INLET 1 -> CHASSIS MOUNT MAINS FILTER 1 -> A THERMAL RELEASE SWITCH 1 -> MM SOLDER TAG 1 -> MM SOLDER TAG 10 -> mm SOLDER TAG 3 -> mm TIE WRAP 20 -> M3*8 METAL SPACER 2 -> M3*20 PLASTIC SPACER HEX 4 -> SHORT BOARD SPACER 12.7MM 4 -> RED P402 KNOB 2 -> *5mm PAN POZI 4 -> mm HEX NUT 19 -> mm INT. SHAKEPROOF 26 -> *12mm PAN POZI 2 -> *20mm PAN POZI 6 -> *8 PAN POZI TAPTE 4 -> M5 INT SHAKEPROOF 2 -> *12mm PAN POZI 1 -> mm BRASS HEX NUT 1 -> WASHER 10MM O/D X 3 1/2MM 2 -> WAY END CONNECTOR 4 -> WAY IDC CONNECTOR 8 -> NO 6*3/8 FLANGE POZI 18 -> NO 4*1/4 PLASTITE 4 -> mm NUTSERT 18 -> X 3/8 PAN POZI AB BLK PO 6 -> A BRIDGE RECTIFIER 1 -> DPST EQ MAINS SWITCH 1 -> SPEAKON SOCKET 3 -> EARTH WARNING LABEL 1 -> HC25/ FASTON 8 -> /4" LG RECEPTACLE 17 -> POZI LOCK NYLON BOOT 16 -> *25 PAN POZI 4 -> *10mm SMALL F/H 8 -> M8 * 60 ROOFING BOLT 1 -> mm SHKPRF WASHER 1 -> POP RIVET (BLACK) 6 -> S/A SQUARE RUBBER FOOT20MM 4 -> mm CAPACITOR CLAMP 2 ->5P MX500 CAP STRAP -1 ->8P-5063 CA1500 SUB FACIA DWG >8P-5064 CA1500/600 TRIM FACIA DWG -1 ->8P-5065 CA1500/600 CHASSIS DWG >8P-5067 CA1500/600C CHASSIS PARTIT -1 ->8P MM CA HEATSINK EXT -4 ->8P-5069 CA1500/600 LID DWG -1 ->8P-9250 CA1500/600 REAR DWG >8P-9255 CA SERIES RACK WINGS DWG -2 ->8P-9256 CA SERIES HANDLE DWG >8P-9257 CA SERIES HANDLE SPACER 2 ->8P-9258 CA SERIES FUSE BRACKET DW 1 >8T-6146 CA V MAINS + CRIMPS -1 Page 2/6
20 CA1500US CA V -> B1/CA OUTPUT ASSY PCB >-> R6 1W 5% WW RESISTOR 4 ->-> OR01 2W5 5% WIREWOUND RESI 4 ->-> KSM % RESISTOR 2 ->-> R 2W5 5% RESISTOR 2 ->-> ORO SHORTING LINK 2 ->-> R 5% RESISTOR 1 ->-> K2 5% RESISTOR 1 ->-> K 5% RESISTOR 11 ->-> M 5% RESISTOR 4 ->-> K7 5% RESISTOR 4 ->-> K 5% RESISTOR 3 ->-> K8 5% RESISTOR 1 ->-> K 5% RESISTOR 2 ->-> K 1W RESISTOR 1 ->-> K 2.5W RESISTOR 2 ->-> R 5W RESISTOR 1 ->-> ZERO OHM RESISTOR 1 ->-> UF 50V RADIAL 4 ->-> UF 25V RADIAL 3 ->-> UF 50V CAPACITOR 1 ->-> UF 35V RADIAL 1 ->-> UF 63V RADIAL 3 ->-> UF 25V CAPACITOR 1 ->-> N 100V 5MM BOX POLY 6 ->-> UF 100V RADIAL CAP 2 ->-> N 250V POLYPROPYLENE CA 2 ->-> N 250V 5MM POLYESTER CA 2 ->-> NF 400V 15MM 2 ->-> NF 63V 5mm 8 ->-> PF 500V CERAMIC 2 ->-> N4007 DIODE 6 ->-> V9.5W ZENER DIODE 2 ->-> V 1.3W ZENER 1 ->-> A 200V BRIDGE 1 ->-> V.5W ZENER DIODE 1 ->-> mm GREEN LED 2 ->-> MM FERRITE BEAD 5 ->-> BYW FAST RECOVERY D 4 ->-> MPSA42/43 TRANSISTOR 2 ->-> STW38NB20 N CHANNEL MOSFET 4 ->-> TA0104A TRIPATH DIGITAL AM 2 ->-> LM V REGULATOR 1 ->-> BAS16 DIODE 7 ->-> BC847B TRANSISTOR 3 ->-> BC857B TRANSISTOR 1 ->-> IC (SMD TL072) 1 ->-> TIP31C TRANSISTOR 2 ->-> IC VOLT'REGULATOR 1 ->-> IC VOLT'REGULATOR 1 ->-> IC 1 ->-> K HORIZ PRESET 2 ->-> HEATSINK TV5 3 ->-> WAY LOCKING HEADER 1 ->-> /4" SPADE TERMINAL 7 ->-> WAY LOCKING HEADER 3 ->-> MM TIE WRAP 1 ->-> A POLY SWITCH/MF-R >-> W PCB SOCKET 2 ->-> UH 20A INDUCTOR 2 ->-> W PCB SOCKET 2 ->-> ALUMINIUM OXIDE FET WASHER 4 Page 3/6
21 CA1500US CA V ->-> mm TIE WRAP 2 ->-> A RELAY 2 ->-> MM TERMINAL SPADE 6 ->-> mm HEX NUT 7 ->-> mm INT SHAKEPROOF 7 ->-> CA/B1 DIGITAL OUTPUT PCB 1 ->-> SHORTING LINK (IDC) 2 ->-> *20mm PAN POZI 7 ->-> POP RIVET (BLACK) 3 ->-> M3*10mm HEX TAPPED 5 ->->8P-9243 CA/B1 OUTPUT TRAY DWG NO -1 ->->8P-5071 CA1500/600/B1 FET CLAMPING 2 Page 4/6
22 CA1500US CA V -> CA SERIES INPUT PCB 9339 A -1 ->-> K % RESISTOR 2 ->-> K % RESISTOR 2 ->-> ORO SHORTING LINK 17 ->-> K 5% RESISTOR 2 ->-> ZERO OHM RESISTOR 2 ->-> KSM % RESISTOR 2 ->-> KSM % RESISTOR 12 ->-> UF 50V CAPACITOR 6 ->-> NF 63V 5mm 6 ->-> PF 50V 10% COG 2 ->-> PF 50V 10% COG 2 ->-> mm LED YELLOW 2 ->-> MM FERRITE BEAD 4 ->-> BAS16 DIODE 12 ->-> MC33078 IC 3 ->-> IC VOLT'REGULATOR 1 ->-> IC VOLT'REGULATOR 1 ->-> K HORIZ PRESET 2 ->-> STEREO JACK SOCKET 2 ->-> HEATSINK TV5 2 ->-> WAY LOCKING HEADER 2 ->-> XLR SOCKET FEMALE 2 ->-> WAY LOCKING HEADER 4 ->-> WAY NON LOCKING 2 ->-> LEDS SPACER 1 ->-> POLE 2 WAY (MX) 1 ->-> WAY IDC CONNECTOR 1 ->-> PCB ISSUE 2 1 ->-> P 3W SLIDE SWITCH 1 ->-> SHORTING LINK (IDC) 2 Page 5/6
23 CA1500US CA V -> CA1500 PCB 9335 VU/SS/O/P -1 ->-> K.25W RESISTOR 1 ->-> ORO SHORTING LINK 1 ->-> K2 5% RESISTOR 2 ->-> K 5% RESISTOR 3 ->-> R 5% RESISTOR 2 ->-> K 5% RESISTOR 4 ->-> UF 50V CAPACITOR 2 ->-> NF 400V 10MM 2 ->-> NF 250V 15MM DIPPED POL 2 ->-> V1.5W ZENER DIODE 1 ->-> mm GREEN LED 7 ->-> SURGE GUARD SCK A 1 ->-> mm LED RED 4 ->-> BC847B TRANSISTOR 1 ->-> LB1413 BARGRAPH DRIVER 2 ->-> K VERTICAL PRESET 2 ->-> B10K 27.5MM POT 2 ->-> A 24V RELAY 1 ->-> WAY 90 DEGREE LOCKING HE 4 ->-> W 90o LOCKING HEADER 1 ->-> LED SPACER 12.7mm 2 ->-> MM TERMINAL SPADE 4 ->-> PCB ISSUE 3 1 ->-> SHORTING LINK (IDC) 2 ->-> TURN CHOKE 2 Page 6/6
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