QSC-PowerLightPFCseries-pwr-sm 维修电路原理图.pdf

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1、PowerLight SeriesTwo-Channel Power AmplifiersTECHNICAL SERVICE MANUAL*TD-000083-00*TD-000083-00Rev. Prelim.PowerLight 6.0 IIPowerLight 6.0PFCPowerLight 9.0PFCONOFFPROTECTSTANDBYPOWER1 CHANNEL 29000 WATT POWER FACTOR CORRECTED PROFESSIONAL AMPLIFIER222232322424262628283030-00-0020201818141488dB1 - C

2、H A N N E L - 2dBCLIP-10dB-20dBSIGNALCLIP LIMITERPOWERLIGHT 9.0PFCHEAR THE POWER OF TECHNOLOGY.RadioFans.CN 收音机爱 好者资料库RadioFans.CN 收音机爱 好者资料库Technical Service Manual1PowerLight 6.0 II, PowerLight 6.0PFC, and PowerLight 9.0PFCQSC Audio Products, Inc.Technical Services GroupPhone:1-800 QSC AUDIO (1-80

3、0-772-2834) USA only+1 (714) 957-7150Fax:+1 (714) 754-6173Postal:1665 MacArthur Blvd.Costa Mesa, California 92626 USAE-mail:tech_Web:http:/ (product information and support)http:/ (parts and accessory sales)PowerLight SeriesTechnical Service ManualCopyright 2004 QSC Audio Products, Inc. All rights r

4、eserved.Document # TD-000083-00, Preliminary Rev. Released November 2004.IMPORTANT NOTICE:This document contains proprietary information that is the propertyof QSC Audio Products, Inc, and may not be disclosed, reproduced orused without express or written consent from QSC Audio Products.PowerLight 6

5、.0 IIPowerLight 6.0PFCPowerLight 9.0PFC2QSC Audio Products, Inc.TD-000083-00PowerLight 9.0PFCPowerLight 6.0PFCPowerLight 9.0 IITechnical Service Manual3PowerLight 6.0 II, PowerLight 6.0PFC, and PowerLight 9.0PFCTable of ContentsPerformance Specifications . 41. Introduction . 51.1 Service bulletins.

6、51.2 The well-equipped service bench . 51.3 Working with surface-mount components. 5Two-terminal components (resistors, capacitors, diodes, etc.). 5Multi-pin components (ICs, etc.) . 6Three-terminal components (transistors, etc.) . 61.4 Series description . 61.5 Technical descriptions and theory of

7、operation . 7Power supplies . 7Audio circuitry. 72. Servicing the amplifier. 82.1 Mechanical disassembly and reassembly . 8Introduction. 8Tools and materials needed . 8Disassembly . 8Reassembly. 112.2 The display board. 132.3 AC line filter . 132.4 Power supply servicing. 15Bench testing power suppl

8、y modules . 15Replacing switching MOSFETs in PFC models. 15Suggestions for troubleshooting. 17Adjusting and calibrating the power supply module. 182.5 AC voltage conversions. 222.6 Bias adjustments . 223. Troubleshooting. 233.1 Initial check . 233.2 Preliminary troubleshooting. 233.3 Further trouble

9、shooting . 244. Parts . 254.1 Semiconductor package descriptions and pinouts . 254.2 Parts lists . 33Chassis Assembly (QSC part #WP-000268-00) . 33Chassis Assembly (QSC part # WP-000268-02) . 34Chassis Assembly (QSC part # WP-000260-00) . 35Chassis Assembly (QSC part # WP-000260-02) . 36Chassis Asse

10、mbly (QSC part # WP-000170-00) . 37Chassis Assembly (QSC part # WP-000170-02) . 38Chassis Assembly, Rear (QSC part # WP-000271-00). 39Chassis Assembly, Rear (QSC part # WP-000264-00). 39Chassis Assembly, Rear (QSC Part # WP-000172-00). 40Output PCB Assembly (QSC part # WP-000179-00) . 40Input PCB As

11、sembly (QSC part # WP-000272-00). 40Input PCB Assembly (QSC part # WP-000265-00). 41Input PCB Assembly (QSC part # WP-000175-00). 41Input Daughterboard Assembly (QSC part # WP-000178-00). 42Audio Channel Module Assembly (QSC part number WP-000276-00). 42Audio Channel Module Assembly (QSC part # WP-0

12、00182-00) . 46Power Supply Assembly (QSC part # WP-000266-00). 50Power Supply Assembly (QSC part # WP-000266-02). 52Power Supply Assembly (QSC part # WP-000262-00). 55Power Supply Assembly (QSC part # WP-000262-02). 56Power Supply Controller Assembly (QSC part # WP-000263-00). 58Power Supply Assembl

13、y (QSC part # WP-000173-00). 60Power Supply Assembly (QSC part # WP-000180-00). 61Power Supply Controller Assembly (QSC part # WP-000174-00). 63Display PCB Assembly (QSC part number WP-000176-00). 64Line Filter Assembly (QSC part number WP-000177-00). 66Line Filter Assembly (QSC part number WP-00018

14、1-00). 66Matched FETs. 675. Schematic diagrams . 684QSC Audio Products, Inc.TD-000083-00PowerLight 6.0 IIPowerLight 6.0PFCPowerLight 9.0PFCOUTPUT POWER in wattsFTC: 20 Hz20 kHz, both channels driven8 per channel1150 ( 0.1% THD)1400 ( 0.1% THD)1800 ( 0.2% THD)4 per channel2050 ( 0.1% THD)2500 ( 0.1%

15、THD)3200 ( 0.2% THD)2 per channel3250 ( 0.1% THD)3250 ( 0.1% THD)EIA: 1 kHz 1% THD, both channels driven8 per channel1300160019504 per channel2200280034002 per channel350035004500Bridge Mono:16, 1 kHz, 1% THD2600320039008, 1 kHz, 1% THD4400560068004, 1 kHz, 1% THD700070009000DYNAMIC HEADROOM0.77 dB

16、4DISTORTIONTHD: 20 Hz20 kHz (8, 4, & 2 10 dB below rated power) 0.06% 0.15%(8 & 4 FTC rated power) 0.1% (20 Hz20 kHz) 0.02% (20 Hz2 kHz) 0.03% (20 Hz2 kHz)20 Hz2 kHz (2) 0.1% (20 Hz20 kHz 3250 W) 0.02% ( 3250 W) 0.05% ( 4500 W)SMPTE-IM: 0.02% 0.02% 2000 8, at 1 kHz and belowNOISE (unweighted 20 Hz t

17、o 20 kHz, below rated output)107 dB107 dB107 dBVOLTAGE GAIN40 (32 dB)INPUT SENSITIVITY, V RMSfull rated power 82.4 v (+9.8 dBu)2.6 v (+10.6 dBu)3.0 v (+11.8 dBu)full rated power 42.3 v (+9.5 dBu)2.5 v (+10.2 dBu)3.8 v (+11.2 dBu)INPUT IMPEDANCE10 k unbalanced20 k balancedCONTROLSFront: AC switch, Ch

18、. 1 and Ch. 2 gain, Ch. 1 and Ch. 2 clip limiter switchesRear: Parallel/Stereo/Bridge switch, remote power supply enable terminalsINDICATORS each channelPROTECT: Red LEDCLIP:Red LEDSTANDBY: Yellow LED-10 dB:Yellow LEDPOWER:Green LED-20 dB:Yellow LEDSIGNAL:Green LEDCONNECTORSInput:Active balanced; “E

19、uro-style” terminal block; Neutrik “Combo” XLRand (6.3 mm) TRS, tip and pin 2 positiveOutput:“Touch-Proof” binding posts (60A rated) and Neutrik Speakon (1 per channel)DataPort:HD 15 female connector for use with QSControl, Basis, or accessoriesCOOLINGFour continuously variable speed fans, back-to-f

20、ront air flowAMPLIFIER PROTECTIONFull short circuit, open circuit, thermal, ultrasonic, and RF protectionStable into reactive or mismatched loadsLOAD PROTECTIONTurn-on/turn-off muting,OUTPUT CIRCUIT TYPEH: Full-bridge current cell vertical N-channel MOSFET linear output with Class H 4-step high effi

21、ciency circuitDIMENSIONS19.0 (48.3 cm) wide, 3.5 (8.9 cm) tall (2 rack spaces)17.9 (45.5 cm) rack mounting to rear support ears; 19.5” (49.5 cm) overallWEIGHTShipping:59 lb. (26.8 kg)65 lb. (29.5 kg)65 lb. (29.5 kg)Net:53 lb. (24.1 kg)59 lb. (26.8 kg)59 lb. (26.8 kg)POWER REQUIREMENTSAvailable for 1

22、20 or 220240 VAC, 50/60 HzPOWER CONSUMPTION 120 VAC(both channels driven)Multiply currents by 0.5 for 230V units1 Pink noise at 1/8 of full power; analogous to typical program with occasional clipping.2 Pink noise at 1/3 of full power; analogous to typical program with heavy clipping.3 Continuous si

23、ne wave at threshold of clipping (1% THD).US patents pendingSPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICEPerformance SpecificationsIdleTypical1Full2Max382.5 A10.3 A19.3 A39.3 A42.5 A15.5 A35.1 A67.5 A22.5 A23.8 A47.4 A104.7 AIdleTypical1Full2Max382.5 A10.3 A19.3 A39.3 A42.5 A15.5 A35.1 A67.5 A22.5

24、 A23.8 A47.4 A104.7 AIdleTypical1Full2Max382.5 A10.3 A19.3 A39.3 A42.5 A15.5 A35.1 A67.5 A22.5 A23.8 A47.4 A104.7 ATechnical Service Manual5PowerLight 6.0 II, PowerLight 6.0PFC, and PowerLight 9.0PFCSolder braid1. Introduction1.3 Working with surface-mountcomponentsPowerLight amplifiers, like many m

25、odern electronic products, usesurface-mount technology (SMT) components where appropriate inorder to make high-density circuitry that is reliable and economicalto manufacture.SMT components in the PowerLight amps are used in the small-signal and control circuits, so they do not handle significantamo

26、unts of power; therefore, they are subject to very little stressand should seldom fail. Sometimes they do fail, or they requirereplacement for a performance upgrade or modification. Thus, it isimportant to know how to work with SMT components.Specialized tools and equipment exist for soldering, unso

27、ldering,and removing SMT components quickly and efficiently, but they areoften expensive. Most SMT repairs, though, can be handled reason-ably well with common tools and equipment, such as tweezers,solder braid, and fine-tip soldering irons.Two-terminal components (resistors, capacitors,diodes, etc.

28、)Removal1. Use two soldering irons, prefer-ably about 25 to 40 watts, withfine tips.2. With a soldering iron in eachhand, hold one tip on the solder atone end of the component and theother tip on the other end (Figure1.1).3. Once the solder melts on bothends, grip the componentbetween the two tips a

29、nd lift itfrom the circuit board.4. Use solder braid and a solderingiron to remove the solder from thetwo pads (Figure 1.2).Insertion1. With a soldering iron and 60/40 or 63/37 eutectic-type solder,melt just enough solder onto one pad to create a small mound(Figure 1.3).2. Grasp the component in the

30、 middle with tweezers. Melt thesmall mound of solder with the iron and place the componentacross the two pads (in the correct orientation, if the compo-nent is sensitive to direction) and press it flat against the circuitboard, with one end of the component immersed in the meltedsolder (Figure 1.4).

31、3. Hold the component in place and take the soldering iron away.1.1 Service bulletinsContact QSC Technical Services to make sure you have the mostup-to-date service bulletins for PowerLight Series amplifiers.Service bulletins may be distributed in hard copy, via fax, andelectronically (Adobe Acrobat

32、 PDF) via CD-ROMs, FTP from the QSCweb site (), and e-mail.These service bulletins had been issued at the time this manualwas printed: PFC0001, “PFC MOSFET Replacement” (PowerLight6.0PFC and PowerLight 9.0PFC only); PFC0002, “PFC Power SupplyReplacement Guidelines” (PowerLight 6.0PFC and PowerLight

33、9.0PFConly); and PFC0003, “Amplifier Goes Into Protect When Turned On”(all three models).1.2 The well-equipped servicebenchTo properly service QSC amplifiers, a technician needs the righttools. The technicians service bench should have the followingequipment: Digital multimeter with RMS AC voltage a

34、nd current Digital clamp-on ammeter Dual-trace oscilloscope Audio distortion analyzer Non-inductive load resistors, configurable as 8 ohms (min. 1800watts capacity), as 4 ohms (min. 3200 watts capacity), and as2 ohms (min. 4500 watts capacity) Variable AC voltage source, such as a Variac or Powersta

35、tvariable transformer, with a rated current capacity of up to 50A(for 120V models) or 25A (for 230V models) Low-distortion audio sine wave generator Philips and flat screwdrivers Soldering iron with a fine tip (2560W recommended) Rosin-core solder (60/40 or 63/37) Long-nose pliers Diagonal cutters W

36、ire strippersAutomated test equipment, such as an Audio Precision worksta-tion, is very useful for servicing PowerLight amplifiers. ContactQSC Technical Services to obtain applicable AP test files.Servicing power supply modules will require some additionalspecial-built equipment: Power supply remote

37、 controller PFC power supply fixture (for PFC modules only) CMP boxBecauseof the complexity of the PFC power supplies, QSCrecommends they be serviced only by QSC.Figure 1.1.Figure 1.2.6QSC Audio Products, Inc.TD-000083-00SolderSolderTweezersSolderLet the solder harden to tack thecomponent in place.4

38、. Fully solder the other end of thecomponent to its pad. Let thesolder harden (Figure 1.5).5. Fully solder the tacked end ofthe component to its pad (Figure1.6).Three-terminalcomponents (transistors,etc.)Removal1. With a soldering iron and solderbraid, remove as much solder aspossible from the middl

39、eterminal of the component.2. With a soldering iron in eachhand, hold one tip on the solderat the terminal at one end of thecomponent and the other tip onthe terminal at the other end.3. When the solder on both endsmelts, grip the component between the two tips and lift it fromthe circuit board. You

40、 might need to quickly touch the pad onthe middle terminal with a soldering iron to melt any remainingsolder that might be holding the component down.4. Use solder braid and a soldering iron to remove the solder fromthe three pads.Insertion1. With a soldering iron and 60/40 or 63/37 eutectic-type so

41、lder,melt just enough solder onto one pad to create a small moundof solder.2. Grasp the component with tweezers. Melt the small mound ofsolder with the iron and place the component in the correctorientation across the three pads and press it flat against thecircuit board, with one terminal of the co

42、mponent pressed intothe melted solder.3. Hold the component in place and take the soldering iron away.Let the solder harden to tack the component in place.4. Fully solder the other terminals of the component to their pads.Let the solder harden.5. Fully solder the tacked terminal of the component to

43、its pad.Multi-pin components (ICs, etc.)RemovalRemoving a multi-pin SMT component is a delicate procedure.Ideally, you should use a soldering iron with an attachment thatallows you to heat all the pins simultaneously.If such a soldering device is not available, use this procedure:1. Use a soldering

44、iron and solder braid to remove as much solderas possible from the pins of the component.2. With fine tweezers, carefully try to lift each pin to see if itsfree. If its not, touch it with the tip of the soldering iron and ifnecessary, use the solder braid to remove the remaining solder.3. Repeat the

45、 process until all the pins are free and you canremove the component.Insertion1. With a soldering iron and 60/40 or 63/37 eutectic-type solder,melt just enough solder onto one pad to create a small moundof solder. It is usually easiest to use a pad that corresponds toone of the end or corner pins of

46、 the component.2. Grasp the component with tweezers. Melt the small mound ofsolder with the iron and place the component in the correctorientation upon its pads and gently press it flat against thecircuit board, with the appropriate terminal of the componentpressed into the melted solder.3. Hold the

47、 component in place and take the soldering iron away.Let the solder harden to tack the component in place.4. Fully solder the other terminals of the component to their pads.Let the solder harden.5. Fully solder the tacked terminal of the component to its pad.1.4 Series descriptionQSCs PowerLight Ser

48、ies amplifiers are high-performanceprofessional audio products, designed primarily for live and touringsound and large-scale installations.This service manual covers the three most powerful modelsdeveloped for the PowerLight Series: the PowerLight 6.0 II, thePowerLight 6.0PFC, and the PowerLight 9.0

49、PFC. Each one has twoaudio channels and is three rack spaces tall. See page 2 forcomplete specifications.The PowerLight 6.0PFC and PowerLight 9.0PFC feature powersupplies with power factor correction, which reduces peak currentdemand by drawing power throughout the AC voltage waveform.The PowerLight

50、 6.0 II has power supplies that dont have PFC butare simpler and less expensive to manufacture.The first four digits of the amplifiers serial number indicate themonth and year of manufacture in MMYY formay. For example,0701xxxxx = July 2001). A serial number that starts with “13”indicates the amplif