JBL-ARCSUB-pwr-sm 维修电路原理图.pdf

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1、S E R V I C EM A N U A LARC SUBJBL Consumer Products Inc.250 Crossways Park DriveWoodbury, N.Y. 11797A Harman International Company1112-ARCSUB Rev A 4/98S E R V I C EM A N U A LARC SUBDiscrete Output, High Current8 Powered SubwooferRadioFans.CN 收音机爱 好者资料库1Powered SubwooferARC SUBTABLE OF CONTENTSSpe

2、cifications .1Warranty.2Safety Symbols .2Controls and Their Functions.3Test Procedures.4Trouble Shooting Before Opening.5Removing the Amplifier.5Trouble Shooting After Removal .5Components Requiring Exact Replacement.6Block Diagram.7Amplifier Exploded View.8Cabinet Exploded View.9Parts Lists.10Packa

3、ging and Shipping.12Integrated Circuit Diagrams.13Printed Circuit Boards .14Schematic Diagrams .16SPECIFICATIONSAmplifier Power RMS.75 WattsDrivers .8 with high-polymer-laminated conesInputs.Line level and High LevelOutputs*.High level with High-Pass filter at 180HzCrossover Frequency.50-150Hz(conti

4、nuosly variable)Frequency Response.45Hz to (50 - 150Hz)(determined by crossover setting)External Dimensions (Inches)Height.9 1/4Width.14Depth.12 1/2Weight .23 lbsExternal Dimensions (mm)Height.235 mmWidth.356 mmDepth.318 mmWeight .10.5 kg* High-Level (speaker) outputs are active only if high-level i

5、nput are used.Occasional refinements may be made to existing products without notice, but will always meet or exceedoriginal specifications unless otherwise stated.RadioFans.CN 收音机爱 好者资料库2Powered SubwooferARC SUBWARRANTYThis amplifier is warranted against defects in materialand workmanship for a per

6、iod of 90 days from date ofshipment, when installed in accordance with the ownersmanual in a clean, dry, interior home environment. THISAMPLIFIER IS NOT SUITABLE FOR OPERATIONOUTSIDE OR IN HARSH ENVIRONMENTS.During thewarranty period, the manufacturer will, at its option, eitherrepair of replace pro

7、ducts which prove to be defective.For warranty service or repair, this product must beproperly packed and returned to a service facilitydesignated by the manufacturer.Buyer shall prepayshipping charges to the designated facility and themanufacturer shall pay shipping charges to return theproduct to

8、buyer.However, Buyer shall pay all shippingcharges, duties and taxes for products returned to themanufacturer from another country.The manufacturer does not warrant that the operation ofthe product will be uninterrupted or error-free. The Buyermust determine the suitability of the product for his or

9、 herpurposes.LIMITATION OF WARRANTYThe foregoing warranty shall not apply to defectsresulting from improper or inadequate maintenance byBuyer, Buyer-supplied interfacing, unauthorizedmodification or misuse, operation outside of theenvironment specifications for the product includinginadequate ventil

10、ation, or improper site preparation,installation, or maintenance.NO OTHER WARRANTY IS EXPRESSED ORIMPLIED.THE MANUFACTURER SPECIFICALLYDISCLAIMSTHEIMPLIEDWARRANTIESOFMERCHANTABILITY AND FITNESS FOR A PARTICULARPURPOSE.EXCLUSIVE REMEDIESTHE REMEDIES PROVIDED HEREIN ARE BUYERSSOLEANDEXCLUSIVEREMEDIES.

11、THEMANUFACTURER SHALL NOT BE LIABLE FOR ANYDIRECT, INDIRECT, SPECIAL, INCIDENTAL, ORCONSEQUENTIAL DAMAGES, WHETHER BASED ONCONTRACT, TORT, OR ANY OTHER LEGAL THEORY.SAFETY SYMBOLSThe following symbols are used throughout this manualand in the product.Familiarize yourself with each of thesymbols and

12、its meaning before servicing this amplifier.Instruction manual symbol. The product will bemarked with this symbol when it is necessary forthe user to refer to the instruction manual in orderto protect the unit against damage.Indicates dangerous voltages are present. Beextremely careful.The CAUTION s

13、ign denoted ahazard.It calls attention to aprocedure which, if not correctlyperformed or adhered to, couldresult in damage to or destruction of the amplifier.Do notproceed beyond a CAUTION sign until the indicatedconditions are fully understood and met.The WARNING sign denotes ahazard.It calls atten

14、tion to aprocedure which, if not correctlyperformed or adhered to couldresult in injury or loss of life.Do not proceed beyond aWARNING sign until the indicated conditions are fullyunderstood and met.GENERAL SAFETY CONSIDERATIONSTHIS UNIT DOES NOT HAVE A POWER SWITCH;HAZARDOUS VOLTAGES ARE PRESENT WI

15、THIN THEUNIT WHENEVER IT IS PLUGGED IN.This still applieswhen the over-temperature thermostat opens, as it mayautomatically reset at any time.There are voltages and hot components at many pointsin the amplifier which can, if contacted, cause serious injury.Be extremely careful.Any adjustments or ser

16、viceprocedures that require operation of the amplifier out of itsenclosure should be performed only by trained servicepersonnel.3Powered SubwooferARC SUBCONTROLS AND THEIR FUNCTION1. Output Level - The Output Level adjustmentdetermines volume level strength.2. Crossover Frequency - The Crossover Fre

17、quencyadjustment determines the highest frequency theARC SUB will reproduce. It allows a seamlesstransition from the subwoofer to the satellitespeakers.3. On (LED) - This LED will light green when the unit isplugged in and is receiving signal. When instandby mode the LED is red.4. Low Level Input -

18、These left and right Line LevelInputs are normally used when thereceiver/processor has line-level “pre-amp out ”or “subwoofer out” jacks.5. Fuse - Use only a slow-blo 1.0A 250V GMC fuse.6. High Level Inputs - These High Level Inputs are forreceivers that do not have line-level “pre-amp out”or “subwo

19、ofer out” jacks. When a pair of main orsatellite speakers are attached to the OUTPUTterminals, frequencies below 180 Hz are attenuatedby the high-pass filter.4Powered SubwooferARC SUBTEST PROCEDURESGeneral FunctionUUT = Unit Under Test1.Connect both right and left line level inputs (RCA) to signal g

20、enerator and UUT. Use Y-cable if necessary frommono source. VOLUME control should be full counterclockwise.2.Turn on generator, adjust to 50mV, 50 Hz.3.Plug in UUT; red LED should be ON. Turn VOLUME control full clockwise.4.LED should turn Green; immediate bass response should be heard and felt from

21、 port tube opening.5.Turn off generator, turn VOLUME control fully counterclockwise, disconnect RCA cables.6.Connect one pair of speaker cables to either high level input terminal on UUT. Cables should be connected toan integrated amplifier fed by the signal generator.7.Turn on generator and adjust

22、so that speaker level output is 2.0V, 50 Hz. Turn VOLUME control full clockwise.8.Green LED should light, immediate bass response should be heard and felt from the port tube opening.Sweep Function1.Follow steps 1-4 above, using a sweep generator as a signal source.2.Sweep generator from 20Hz to 300H

23、z. Listen to the cabinet and drivers for any rattles, clicks, buzzes or anyother noises. If any unusual noises are heard, remove driver and test.Driver Function1.Remove driver from cabinet; detach + and - wire clips.2.Check DC resistance of driver; it should be 3.0 ohms.3.Connect a pair of speaker c

24、ables to driver terminals. Cables should be connected to an integrated amplifier fed bya signal generator and adjust so that speaker level output is 5.0V.4.Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.5Powered SubwooferARC SUB1. TROUBLE SHOOTI

25、NG BEFORE OPENINGCheck connections, control settings, driver and otherpossible external problems. If there is Output, determine ifall controls and Inputs function properly. Rotate Pots overfull range while applying lateral and vertical oscillatingforces to locate possible intermittent function. High

26、 LevelInputs should be tested individually both differentially(signal from - to + with normal output) and in commonmode (signal from low level ground to both + and -shorted together, giving virtually no output). While passinga signal, corner drop the enclosure a few inches to exposepossible intermit

27、tent problems. Check woofer for rubbing ofvoice coil or tears in cone or surround. Check cabinet forloose extraneous articles which may have been pushedinto front port.2. REMOVING THE AMPLIFIER.There are voltages and hot components at many pointsin the amplifier which can, if contacted, cause person

28、alinjury. Be extremely careful. Any adjustments or serviceprocedures that require operation of the amplifier out of itsenclosure should be performed only by trained servicepersonnel. Refer to PCB drawings for locations of hazardsand familiarize yourself with their locations before starting.3. TROUBL

29、E SHOOTING AFTER REMOVALVerify AC plug is disconnected. See WARNINGS insection 2.To prevent loose hardware from reducing safetyspacings, it is essential that all hardware be replaced in thesame manner as it was removed, with lock washers underall nuts, proper torque on screws and thread locking seal

30、eron the transformer nuts.If line core, its strain relief, or the AC switch arereplaced, it is necessary to seal them completely to panelwith an approved conformal coating to prevent airwhistling through any openings from woofer pressure.To reduce the risk or electric shock and/orfire, replace items

31、 as marked on schematicwith the safety marking only with the exactreplacements listed in the safety componentlist, section 5.If exact replacements are not available,order them from the factory or an authorized service center.A.)Check fuse F1. If blown visually check transformerfor discoloration, and

32、 large capacitors (C36, C37) forbulges or venting. Check for shorts in Q3-Q7 withan Ohmmeter, (see schematic).B.With ohmmeter, verify contacts of thermostat areclosed, voice coil of woofer is 3.0 ohms, andwindings of transformer are continuous.C.Examine board and wiring for obvious damage,broken or

33、poorly soldered connections, ordiscoloration.D.Repair or replace items identified above. Proceduresfor replacing power transistors and removing PCBare as follows:Use low power, grounded temperature regulated ironwith small tip such as Weller PTA7 and ESD control.Use SN63/37 solder 0.032 diameter wit

34、h no cleanflux core, Alpha Metals P2 or equal.I)Replacing power transistors: Clip all 3 leadsnear body of transistor. Remove screw anddiscard device (keep hardware and insulator).Holding each lead in turn with needle noseBEFORE THIS AMPLIFIER IS PLUGGED IN, make sure its rated voltage corresponds to

35、 the voltage of the AC powersource to be employed. Failure to use the correct voltage could cause damage to the amplifier when the AC power cable isplugged in. Do not exceed the rated voltage by more than 10%; operation below 90% will degrade performance or cause theunit to shut off.6Powered Subwoof

36、erARC SUBpliers, gently heat and remove cut lead fromhole in edge or PCB.Clean insulator and seating area on back ofpanel. Coat both sides of insulator with silicon(white) thermal compound (unless siliconerubber pads are provided), position it centeredon back of device with holes aligned. Insertlead

37、s into PCB then place pair over hole inpanel; ensure hole in insulator is aligned. Insertscrew from far side, pass shoulder bushing overscrew and carefully seat shoulder in hole in tab,add flat washer, lock washer and nut (fingertight). Center insulator tighten screw first thensolder all three leads

38、 in respective slots with fullfillet, being careful not to bridge pads. Useohmmeter to verify there is no short from tab oftransistor to panel, or between pads.Never operate amplifier with load connectedwhen PC assembly is not attached to panel orwhen any of output transistors is not properlyscrewed

39、 to panel.After repair, inspect for possible safety hazards,including loose hardware, missing lock washers, correctfuse and lead dress of primary wires (these must be held inposition with cable ties so that they cannot touch secondarycomponents).With ohmmeter, check that panel isconnected to signal

40、ground.It is essential that the following safety insulation test beperformed prior to returning the Power Sub-Woofer to thecustomer, using one of the following methods.A) Insulation Resistance TestWith a 500VDC Insulation Tester, Checkinsulation from the outer metal contact of theRCA jack (chassis)

41、to the line neutral of ACcord. Resistance should be 100M.B) Hi-Pot TestIf a UL approved Hi-Pot tester is available, testline & neutral of AC cord to outer shell of RCAjack (chassis) at 1100VAC for 2 seconds.Observe all of instrument manufacturersinstructions and safety warnings in performingthis tes

42、t.Connect sub-woofer system to a music source. Play athigh level while checking for air leaks around panel edge,driver, panel jacks and controls, and voice coil problemssuch as rubbing or loose turns.With the crossoverfrequency set to 50Hz, very little of the voice contentshould be heard.4. LIST OF

43、SAFETY COMPONENTSREQUIRING EXACT REPLACEMENTSF1Fuse SLOW BLO 1A 250v GMCUL approvedFHFuse holder. Use only factoryreplacementPWR CORDSPT-2 better with polarized plug,UL appoved wired with the hot sideto fused side. Use with UL approvedpanel strain relief only.XFTransformer. Use only factoryreplaceme

44、ntBD1Bridge diode. Use only factoryreplacement.C36, 374700uF, 50V electronic filter caps.Be sure replacement part is at least thesame working voltage and capacitancerating. Also the lead spacing isimportant. Incorrect spacing maycause premature failure due to internalcabinet pressures and vibration.

45、K1Safe operating area relay to protectoutput devices. Use only factoryreplacement.R645.6 .5W METAL FILM, non flammable7Powered SubwooferARC SUBARC SUB AMPLIFIER BLOCK DIAGRAM8Powered SubwooferARC SUBAMPLIFIER EXPLODED VIEW9Powered SubwooferARC SUBCABINET EXPLODED VIEW10Powered SubwooferARC SUBELECTR

46、ICAL PARTS LISTRef. NumberPart NumberDescriptionQuantityCapacitorsC1, 2130001529100UF 100V NP2C3, 41300005574.7UF 16V2C5, 6135100811100PF CERAMIC2C7, 111300006270.015UF 5% MYLAR2C813502081120PF CERAMIC1C9, 101300006270.015UF MYLAR2C121300486070.1UF 16V1C13130006100.001UF MYLAR1C141300486040.68UF 16V

47、1C151300006200.033UF 5% MYLAR1C161300006280.0039UF 5% MYLAR1C17, 261300486050.33UF 16V2C181300006390.0056UF 5% MYLAR1C191300006100.001UF 5% MYLAR1C201300005960.22UF 16V1C21135470811470PF CERAMIC1C22130054710100UF 16V1C231321046520.1UF CERAMIC1C241300005511000UF 25V1C251300005274.7UF 16V1C27, 28, 291

48、30000518100UF 25V3C301300006220.01UF MYLAR 5%1C311300006190.047UF MYLAR 5%1C3213502281122PF CERAMIC1C3313000050610UF 16V1C34, 35130000549220UF 25V2C36, 371300015304700UF 50V2ResistorsR1, 2, 3, 4092101502100 MF 2W4R5, 6084274503270K CF 1/4W2R7, 80864725024.7K CF 1/4W 10MM2R9, 1008447350347K CF 1/4W 1

49、0MM2R11, 1208433350333K CF 1/4W2R13, 1408647350247K 1/4W 10MM2R15, 160861025021K CF 1/4W 10MM2R17, 18073893582379K MF 1/16W 1%2R1907232518223.25K MF 1/16W 1%1R200866255022.2M MF 1/4W 10mm1R21, 22079303582930K MF 1/16W 1%2R23071415282141.5K MF 1/16W 1%1R2407738258273.8K MF 1/16W 1%1R25071475282147.5K

50、 MF 1/16W 1%1R26073203582320K MF 1/16W 1%1R27071603582160K MF 1/16W 1%1R28073203582320K MF 1/16W 1%1R29, 30, 31,08410350310K CF 1/4W635, 36, 37Ref. NumberPart NumberDescriptionQuantityR320843925033.9K CF 1/4W1R33086224502220K 1/4W 10mm1R340861025021K CF 1/4W 10mm1R380841025031K CF 1/4W1R390844705034