Infinity-475A-pwr-sm 维修电路原理图.pdf

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1、 Reference Series 475a 4,3,2 CHANNEL POWER AMPLIFIER SERVICE MANUAL Infinity Systems, Inc. 250 Crossways Park Dr. Woodbury, New York 11797 Rev1 3/2008 Released 2007 Discontinued XXXX RadioFans.CN 收音机爱 好者资料库- CONTENTS - BASIC SPECIFICATIONS .1 DETAILED SPECIFICATIONS .2 PACKING.3 APPLICATIONS4 INSTAL

2、LATION/SETUP.6 BASIC TROUBLESHOOTING.6 EXPLODED VIEW/PARTS LIST.7 NOTE ON TOP COVER.8 AMPLIFIER BLOCK DIAGRAM.9 P.C.B. DRAWINGS.10 ELECTRICAL PARTS LIST . 16 IC/TRANSISTOR PINOUTS.21 SCHEMATICS.22 Reference 475a Basic Specifications Output Power: 75W RMS x 4 4 ohms; 1% THD + N (14.4 VDC) 90W RMS x 4

3、 2 ohms; 1% THD + N Signal-to-noise ratio: 85dBA (reference 1W into 4 ohms) Dynamic power: 117W channels 2 ohms Effective damping factor: 6.3 4 ohms Frequency response: 10Hz 100kHz (-3dB) Maximum input signal: 6.0V Maximum sensitivity: 100mV Output regulation: 0.21dB 4 ohms Dimensions (L x W x D): 1

4、4-3/16 x 9 x 2-11/16 (361mm x 229mm x 69mm) Fuse: 2 x 35A Infinity continually strives to update and improve existing products, as well as create new ones. The specifications and details in this and related JBL publications are therefore subject to change without notice. 475a Reference Series RadioF

5、ans.CN 收音机爱 好者资料库INFINITY REFERENCE 475a AMPLIFIER SPECIFICATIONS TEST VOLTAGE 14.4 +0.1V Specification Rating Unit Remarks Power Output 4ohm loads 1kHz (stereo mode) for each ch 1.0%THD (Unit:W)(LPF=22K) 75W x 4 Watts Power Output 2ohm loads 1kHz (stereo mode) for each ch 90 dBA 1 watt into 4 ohms

6、1V signal input Input Sensitivity Low Level Input(v) :full rated power 100mV-6V Volts 20% Frequency response (Unit:-3dB) 10Hz100kHz Hz -3dB High-Pass Crossover Frequency limits +20% 40Hz 450Hz Hz Low-Pass Crossover Frequency limits +20% 40Hz 450Hz Hz Bass Boost:(Unit:dB) 50Hz (5Hz ) 06dB dB 1dB Idle

7、 Current ( 4ohm) 0.5A A 0.15A MAX current : rated power (All channel 2 ohm loads) 65A A DC Offset: 30mV mV Damping Factor (4ohm): 200 Effective damping factor (4ohm): 6.395 Dynamic Power 2 ohms 130W Watts Output Regulation 4 ohms 0.03dB dB Remote Operating Voltages: ON 5V OFF 4V Volts 1V Turn on del

8、ay time 2 to 3 Sec Circuit Protection a. Temperature b. Speaker Short Circuit c. Operating Voltage Range 95 5 deg C Yes 816V +0.5V Dimensions (L x W x H): 14-3/16 x 9 x 2-11/16 (361mm x 229mm x69mm) Inches mm Fuses 35A x 2 A 475a Reference Series 2PACKAGING Item Part Number Description Qty 1 CH44829

9、01203 Outer Carton 1 2 REF475a REF475a Amplifier 1 3 Plastic Bag 1 4 BZL279112001 Packing Foam 1 5 Visit I Owners manual 1 6 Plastic Bag 1 7 Accessory kit consisting of: 1 LS1CJ0402507 Mounting Screws 4 1601-353G-00 SPARE 35A FUSES 2 475a Reference Series 3To Head UnitFront OutputTo Head UnitRear Ou

10、tputRear SpeakersFront SpeakersFigure 5. 475a connected to full-range speakers. Notecrossover and channel assignment settings.Figure 6. 475a connected to four satellite speakers and used in conjunction with an additional subwoofer amplifier or powered subwoofer. Note crossover and channel assignment

11、 settings.To Head UnitFront OutputTo Sub AmpTo Head UnitRear OutputRear SpeakersFront SpeakersThe 475a can be set up for stereo 4-channel, 3-channel or bridged 2-channel operation, asshown in Figures 5 through 8. NOTE: Minimum speaker impedance for stereo operation is 2 ohms. Minimum speaker impedan

12、ce for bridged operation is 4 ohms. Not all possible applications are shown here;e.g., the applications shown in Figures 5, 6 or 8could include a separate subwoofer driven byan additional amplifier. In that case, the usershould refer to Figure 6 for crossover and subamp connection suggestions.APPLIC

13、ATIONS 475a 475a Reference Series 4APPLICATIONS 475aTo Head UnitFront OutputTo Head UnitSub OutputSubwooferFront SpeakersFigure 7. 475a connected in tri-mode to a subwooferand a pair of satellite speakers. Note crossover andchannel assignment settings.Figure 8. 475a connected in bridge mode to a pai

14、r offull-range speakers. Note crossover and channelassignment settings.To Head UnitLeftTo Head UnitRightRight SpeakerLeft Speaker 475a Reference Series 5SETTING INPUT SENSITIVITY1. Initially turn the INPUT LEVEL control(s) to the minimum (counterclockwise) position.2. On the source unit, increase th

15、e volume control to 3/4 volume. Slowly increase theINPUT LEVEL control(s) toward three oclockuntil you hear slight distortion in the music.Then reduce the INPUT LEVEL slightly untildistortion is no longer heard. NOTE: After the source unit is on, blue LEDs (onthe top panel) will light, indicating th

16、e amplifieris on. If not, check the wiring, especially theremote connection from the source unit. Alsorefer to “Troubleshooting.”REMOTE LEVEL CONTROLThe 1300a, 1600a and 5350a include a remotelevel control. This will allow the subwoofer levelto be adjusted from the listening position.Connect the rem

17、ote level control using the RJ11 jack on the side of the amplifier. Install the control module in the front of the vehiclewithin easy reach of the driver. Both the under-side of the dash and the center console are suitable locations.UNDER-DASH MOUNTING Select a mounting location that allows easyacce

18、ss to the control while driving. Using theREMOTE LEVEL control as a template, mark anddrill holes in the mounting surface. Attach theREMOTE LEVEL control using the mountingscrews provided (Figure 11). Figure 11. Under-dash mounting of the REMOTE LEVEL control. Refer to the illustrations on the previ

19、ous pagesfor control location. Reconnect the () negative lead to the vehiclesbattery. Apply power to the audio system andplay a dynamic music track.SETTING THE CROSSOVER(S)Determine your system plans and set thecrossover-mode switch accordingly. If your system design does not include a subwoofer, se

20、t the crossover mode to FULL and skip to“Setting Input Sensitivity.”If your system includes a subwoofer, set thecrossover mode to HP (high-pass) for your full-range speakers. Adjust the crossover frequency to limit bass, and provide increasedsystem volume with less distortion.Mode Switch: Full: Allo

21、ws a full-range signal through to thespeakers; can be used with larger full-rangespeakers such as 6 x 9s.HP: Allows a high-pass signal through to the speakers; should be used with most loudspeakers (can protect your full-range speakers from being overdriven with low frequencies, one cause of speaker

22、 damage).LP: Allows only bass to pass through to thespeakers; should be selected when poweringsubwoofers.High-Pass Filters: Initially set the crossover-frequency control midway. While listening to music, adjust the crossover for the least perceived distortion from the speakers, allowingthem to repro

23、duce as much bass as possible. Low-Pass Filters: For subwoofers, choose the highest frequency that removes vocal information from the sound of the subwoofer.If using the 475a to drive a subwoofer(s), set the crossover mode to LP (low-pass) on thechannels connected to the subwoofer.NOTE: The 1300a, 1

24、600a and the subwoofer output of the 5350a are low-pass only and do not have a crossover-mode switch.INSTALLATION ANDSETUPRoute the cable behind the dash or other interior panels and under the carpet. Do notroute the cable outside the vehicle. Connect theRJ11 cable between the RJ11 receptacle on the

25、amp and the receptacle on the REMOTE LEVELcontrol (Figure 12). Figure 12. REMOTE LEVEL control electrical connection.SETTING THE BASS BOOSTThe Bass Boost control will allow you to enhancethe bass output of your system at 50Hz up to 6dB.AUX OUTPUTReference amplifiers (except 5350a) areequipped with f

26、ull-range outputs that can beused to connect additional amplifiers.STATUS LEDsPower: Indicates the amplifier is on.Protection: Refer to “Troubleshooting” for specificindications.Figure 13. LED status.TROUBLESHOOTING PROBLEM: No audio (POWER LED is off).CAUSE and SOLUTION: No voltage at BATT+and/or R

27、EM terminals, or bad or no groundconnection. Check voltages at amplifier terminals with VOM. PROBLEM: No audio (PROTECT LED glows red).CAUSE and SOLUTION: DC voltage on amplifieroutput. Amplifier may need service; seeenclosed warranty card for service information. PROBLEM: No audio (PROTECT LED glow

28、s red).CAUSE and SOLUTION: Amplifier is overheated.Make sure amplifier cooling is not blocked atmounting location; verify that speaker-systemimpedance is within specified limits. PROBLEM:No audio (PROTECT LED glows red).CAUSE and SOLUTION: Voltage less than 9V onBATT+ connection. Check vehicle charg

29、ing system. PROBLEM: No audio (PROTECT LED glows red).CAUSE and SOLUTION: Voltage greater than16V or less than 8.5V on BATT+ connection.Check vehicle charging system. PROBLEM: Distorted audio.CAUSE and SOLUTION: Input sensitivity is not set properly, or amplifier or source unit isdefective. Check IN

30、PUT LEVEL setting, or checkspeaker wires for shorts or grounds. PROBLEM: Distorted audio (PROTECT LED glowsintermittently).CAUSE and SOLUTION: Short circuit in speakeror wire. Remove speaker leads one at a time tolocate shorted speaker or wire, then repair. PROBLEM: Music lacks “punch.”CAUSE and SOL

31、UTION: Speakers are not connected properly. Check speaker connectionsfor proper polarity. 475a Reference Series 6 Item# Part Number Description Qty 1 SG-0016-2601 Top cover (original, see Page 8) 1 SG-0001-2607 Top cover (Rev1, see Page 8) 1 2 GD-600011400 Light panel 1 3 SR-F475-0117 Main heat sink

32、 1 4 LSIFM0300011 Screw 5 5 Main PCB 1 6 MK-0005-2601 Front panel 1 7 LS5KP0300807 Screw for F/RP 8 8 LS5KJ0301007 Screw for terminal, RCA jacks 6 9 XN-10500-012 Knob 6 10 LSIAP0300607 Screw 6 11 LSIAM0300607 Screw 2 12 XG-0017-2601 Bottom plate 1 13 LSIAY0301201 Screw 2 14 PL-L0007-000 Transistor s

33、pring clip (2) 4 15 PL-L0006-000 Transistor spring clip (1) 6 16 ZL-10037A-15 Space Pole 2 17 HG-0006-2601 Rear panel 1 18 LSIAA0200501 Screw 1 19 LS1AM0250401 Screw 4 20 LED PCB 1 21 CP-B00011400 LED lens 1 475a Reference Series 7 NOTE ON TOP COVER FOR INFINITY REFERENCE MODELS REF475A, REF1300A, R

34、EF1600A There was a revision in the top cover design starting with the serial number range(s) noted below, or identified by the brace design in the supplied images. Note the Rev1 Top cover will not fit properly on the original heatsink. Top Cover Part Numbers MODEL PART NUMBER SERIAL NUMBER REF475A

35、SG-0016-2601 EV0001-01000 to EV0001-09138 REF475A SG-0001-2607 EV0001-09139 And above REF1300A SG-0016-2601 EV0003-01000 to EV0003-08606 REF1300A SG-0001-2607 EV0003-08607 And above REF1600A SG-0016-2601 EV0004-01000 to EV0004-11811 REF1600A SG-0001-2607 EV0004-11812 And above 475a Reference Series

36、8123456ABCD654321DCBAINPUT LAUX OUT LAUX OUT RINPUT ROPOPOPOP1234IMS INPUT2314AMODE:FRONT/REAR/SUB 2314AMODE:FRONT/REAR/SUB2314A2314AMODE:RIGHT/STEREO/LEFTMODE:RIGHT/STEREO/LEFT132A132AOPOP10100K32320MODE HP/FLAT/LPVARIABLE LPF/HPF32Hz-320Hz/12dB10100K32320MODE HP/FLAT/LPVARIABLE LPF/HPF32Hz-320Hz/1

37、2dB10100K5010100K50BASS BOOSTVARIABLE0dB-6dB/50HzBASS BOOSTVARIABLE0dB-6dB/50HzAMPAMPINPUT RLINPUT RROPOP1234IMS INPUT2314AMODE:FRONT/REAR/SUB 2314AMODE:FRONT/REAR/SUB2314A2314AMODE:RIGHT/STEREO/LEFTMODE:RIGHT/STEREO/LEFT132A132AOPOP10100K32320MODE HP/FLAT/LPVARIABLE LPF/HPF32Hz-320Hz/12dB10100K3232

38、0MODE HP/FLAT/LPVARIABLE LPF/HPF32Hz-320Hz/12dB10100K5010100K50BASS BOOSTVARIABLE0dB-6dB/50HzBASS BOOSTVARIABLE0dB-6dB/50HzAMPAMPMAIN AMPFRONT LMAIN AMPFRONT RMAIN AMPREAR RLMAIN AMPREAR RR4 ohm/2 ohm4 ohm/2 ohmspeakerspeakerspeakerBTL-4ohm4 ohm/2 ohm4 ohm/2 ohmspeakerspeakerspeakerBTL-4ohmpower sup

39、plyBattery+VCC-VCC+15V-15V 475a Reference Series 9 475a Reference Series 10 475a Reference Series 11 475a Reference Series 12 475a Reference Series 13 475a Reference Series 14 475a Reference Series 15REFERENCE 475a Electrical Parts List Part NumberQty Reference DesignatorMain PCBResistors0701-9101-0

40、2ResistorSMD 100 1/2W 5% 25122R46 R16 0701-3103-02ResistorSMD 10K 1/4W 5% 12061R500702-4220-02Resistor 1W 22 5% 2R20 R190702-4471-02Resistor 1W 470 5% 4R76 R75 R77 R780701-2220-02ResistorSMD 22 1/8W 5% 08051R430701-2470-03ResistorSMD 47 1/8W 1% 080524R16D R16C R16B R16A R15D R15C R15B R15A R14D R14C

41、 R14B R14A R13D R13C R13B R13A R4D R4C R4B R4A R3D R3C R3B 0701-2101-02ResistorSMD 100 1/8W 5% 080510R64 R42 R41 R40 R39 R38 R12D R12C R12B R12A0701-2221-03ResistorSMD 220 1/8W 1% 08052R70 R170701-2102-03ResistorSMD 1K 1/8W 1% 080527R120A R120 R119A R119 R44 R31 R30 R29 R28 R17C R17B R17A R17D R2D R

42、2C R2B R2A R1D R1C R1B R1A R15 R26 R112A R112 0701-2821-02ResistorSMD 820 1/8W 5% 08058R23D R23C R23B R23A R24D R24C R24B R24A0701-2202-02ResistorSMD R0805 2K 1/8W 5% 6R2 R71 R138 R137 R136 R1350701-2302-02ResistorSMD 3K 1/8W 5% 08051R130701-2332-03ResistorSMD 3.3K 1/8W 1% 08055R47 R18D R18C R18B R1

43、8A0701-2432-03ResistorSMD 4.3K 1/8W 1% 08054R19D R19A R19C R19B0701-2472-02ResistorSMD 4.7K 1/8W 5% 08053R36 R11 R370701-2682-03ResistorSMD 6.8K 1/8W 1% 080518R5 R9D R9C R9B R9A R8D R8C R8B R8A R118A R118 R117 R117A R116A R116 R115A R115 R510701-2822-02ResistorSMD 8.2K 1/8W 5% 08051R1340701-2103-02R

44、esistorSMD 10K 1/8W 5% 080552R23 R133 R132 R131 R130 R113A R113 R110A R110 R109A R109 R108A R108 R107A R107 R104A R104 R103A R103 R102A R102 R101A R101 R100A R100 R73 R54 R34 R22 R21 R11D R11C R11B R11A R10D R10C R10B R10A R7D R7C R7B R7A R6D R6C R6B R6A R5D R5C R5B R5A R1 R60701-2203-03ResistorSMD

45、20K 1/8W 1% 08055R26D R26C R26B R26A R480701-2153-02ResistorSMD 15K 1/8W 5% 08051R530701-2183-02ResistorSMD 18K 1/8W 5% 08053R7 R9 R80701-2223-02ResistorSMD 22K 1/8W 5% 08052R35 R18 0701-2303-03ResistorSMD 30K 1/8W 1% 08055R128 R127 R124 R106 R100701-2334-02ResistorSMD 330K 1/8W 5% 08051R30701-2333-

46、02ResistorSMD 33K 1/8W 5% 08052R45 R650701-2113-02ResistorSMD 11K 1/8W 5% 08051R270701-2123-02ResistorSMD 12K 1/8W 5% 08051R240701-2623-03ResistorSMD 62K 1/8W 1% 08054R125 R114A R114 R106A0701-2104-02ResistorSMD 100K 1/8W 5% 080512R25 R111 R12 R4 R27D R27C R27B R27A R33 R52 R55 R790701-3151-02Resist

47、orSMD 150 1/4W 5% 12068R21D R21C R21B R21A R20D R20C R20B R20A0701-3472-02ResistorSMD 1/4W 4.7K 5% 12063R63 R62 R490701-54R7-02ResistorSMD 4.7 1/2W 5% 25126R25D R25C R25B R25A R122 R1210706-5101-02Resistor 5W 100 5% 2R61 R600705-50R1-06Resistor 5W 0.1*2 5% 26*5*18MM 4R22D R22C R22B R22A1201-1021-03V

48、ariable Resistor1k 4RW1D RW1C RW1B RW1A0701-2752-02ResistorSMD 7.5K 1/8W 5% 08052R14 R32Description 475a Reference Series 16Part NumberQty Reference DesignatorDescriptionMain PCB0701-2563-02ResistorSMD 56K 1/8W 5% 08054R59 R58 R57 R561204-5031-18Variable ResistorA50K R0971G2B W=5 L=15MM T=7.5MM M=1M

49、M FREQ2VR100A VR1001204-5040-01Variable ResistorC500K L=15mm 10% BASS BOOST2VR101 VR102Capacitors06S123917000Ceramic CapacitorSMD 390PF/100V 0805 X7R 10%8C5D C5C C5B C5A C4D C4C C4B C4A06S321026000Ceramic CapacitorSMD 1000pF/50V 0805 NPO 5%1C2606S122226000Ceramic CapacitorSMD 2200pF/50V 0805 X7R 10%

50、1C2906S121017000Ceramic CapacitorSMD 100PF/100V 0805 X7R 10%8C3D C3C C3B C3A C2D C2C C2B C2A 06S322206000Ceramic CapacitorSMD 22pF/50V 0805 NPO 5%8C109A C109 C108A C108 C101A C101 C100A C10006D3C2247701Ceramic Capacitor 224/100V 5% 4C10D C10C C10B C10A06S121046000Ceramic CapacitorSMD 0.1uF/50V 0805