JBL-ARCSUB8-pwr-sm 电路图 维修手册.pdf

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1、S E R V I C EM A N U A L JBL Consumer Products Inc. 250 Crossways Park Drive Woodbury, N.Y. 11797 A Harman International Company 1112-ARCSUB8 Rev A 10/98 S E R V I C EM A N U A L ARC SUB 8 Discrete Output, High Current 8 Powered Subwoofer RadioFans.CN 收音机爱 好者资料库 1 Powered SubwooferARC SUB 8 TABLE OF

2、 CONTENTS SPECI? ICA? IONS.1 WARRAN? Y.2 SA? E? Y SYMBOLS.2 CON? ROLS AND ? HEIR ? UNC? ION.? ? ES?PROCEDURES.? ? ROUBLESHOO? IN?.5 ARC SUB 8 AMPLI? IER BLOC?DIA? RAM.7 CABINE?E? PLODED VIEW.8 ARC SUB 8 ELEC? RICAL PAR? S LIS? S.9 ARC SUB 8 MECHANICAL PAR? S LIS? S .10 PAC? A? IN?E? PLODED VIEW.11 I

3、N? E? RA? ED CIRCUI?DIA? RAM .12 PRIN? ED CIRCUI?BOARD ? ? OP VIEW? .1? SCHEMA? IC DIA? RAM 1.1? SCHEMA? IC DIA? RAM 2.15 SPECIFICATIONS Amplifier Power RMS.80 Watts ? 1? ? HD Drivers .8 with high-polymer-laminated cone Inputs.Line level and High Level Outputs? .High level with High-Pass filter at 1

4、80H? Crossover ? re? uency.50-150H? ? continuosly variable? ? re? uency Response.? 5H?to 150H? ? determined by crossover setting? Input Impedance .20k ohm Input Sensitivity.220mV External Dimensions (Inches) Height.9 ? Width.1? Depth.12 ? Weight .18 lbs External Dimensions (mm) Height.2? 5 mm Width.

5、? 5?mm Depth.? 18 mm Weight .8.1 kg ? High-Level ? speaker? outputs are active only if high-level input are used. Occasional refinements may be made to e? isting products without notice, but will always meet or e? ceed original specifications unless otherwise stated. This Product is Part of the ARC

6、CINEMA II SYSTEM RadioFans.CN 收音机爱 好者资料库 2 Powered SubwooferARC SUB 8 WARRANTY ? his amplifier is warranted against defects in material and workmanship for a period of 90 days from date of shipment, when installed in accordance with the owner? s manual in a clean, dry, interior home environment.? HI

7、S AMPLI? IER IS NO?SUI? ABLE ? OR OPERA? ION OU? SIDE OR IN HARSH ENVIRONMEN? S.During the warranty period, the manufacturer will, at its option, either repair of replace products which prove to be defective. ? or warranty service or repair, this product must be properly packed and returned to a ser

8、vice facility designated by the manufacturer.Buyer shall prepay shipping charges to the designated facility and the manufacturer shall pay shipping charges to return the product to buyer. However, Buyer shall pay all shipping charges, duties and ta? es for products returned to the manufacturer from

9、another country. ? he manufacturer does not warrant that the operation of the product will be uninterrupted or error-free.? he Buyer must determine the suitability of the product for his or her purposes. LIMITATION OF WARRANTY ? he foregoing warranty shall not apply to defects resulting from imprope

10、r or inade? uate maintenance by Buyer, Buyer-supplied interfacing, unauthori? ed modification or misuse, operation outside of the environment specifications for the product including inade? uate ventilation, or improper site preparation, installation, or maintenance. NO O? HER WARRAN? Y IS E? PRESSE

11、D OR IMPLIED. ? HE MANU? AC? URER SPECI? ICALLY DISCLAIMS ? HE IMPLIED WARRAN? IES O? MERCHAN? ABILI? Y AND ? I? NESS ? OR A PAR? ICULAR PURPOSE. EXCLUSIVE REMEDIES ? HE REMEDIES PROVIDED HEREIN ARE BUYER? S SOLE AND E? CLUSIVE REMEDIES.? HE MANU? AC? URER SHALL NO?BE LIABLE ? OR ANY DIREC? , INDIRE

12、C? , SPECIAL, INCIDEN? AL, OR CONSE? UEN? IAL DAMA? ES, WHE? HER BASED ON CON? RAC? , ? OR? , OR ANY O? HER LE? AL ? HEORY. SAFETY SYMBOLS ? he following symbols are used throughout this manual and in the product. ? amiliari? e yourself with each of the symbols and its meaning before servicing this

13、amplifier. Instruction manual symbol.? he product will be marked with this symbol when it is necessary for the user to refer to the instruction manual in order to protect the unit against damage. Indicates dangerous voltages are present. Be e? tremely careful. ? he CAUTION sign denoted a ha? ard.It

14、calls attention to a procedure which, if not correctly performed or adhered to, could result in damage to or destruction of the amplifier.Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met. ? he WARNING sign denotes a ha? ard. It calls attention to a pro

15、cedure which, if not correctly performed or adhered to could result in in? ury or loss of life.Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met. GENERAL SAFETY CONSIDERATIONS THIS UNIT DOES NOT HAVE A POWER SWITCH; HAZARDOUS VOLTAGES ARE PRESENT WITHIN

16、 THE UNIT WHENEVER IT IS PLUGGED IN. ? here are voltages and hot components at many points in the amplifier which can, if contacted, cause serious in? ury.Be e? tremely careful. Any ad? ustments or service procedures that re? uire operation of the amplifier out of its enclosure should be performed o

17、nly by trained service personnel. RadioFans.CN 收音机爱 好者资料库 3 Powered SubwooferARC SUB 8 CONTROLS AND THEIR FUNCTION 1. Output Level - ? he Output Level ad? ustment determines volume level strength. 2. Crossover Frequency - ? he Crossover ? re? uency ad? ustment determines the highest fre? uency the A

18、RC SUB 8 will reproduce. It allows a seamless transition from the subwoofer to the satellite speakers. ? . On (LED) - ? his LED will light green when the unit is plugged in and is receiving signal. When in standby mode the LED is red. ? . Low Level Input - ? hese left and right Line Level Inputs are

19、 normally used when the receiver/processor has line-level ? pre-amp out ? or ? subwoofer out? ? acks. 5. High Level Inputs - ? hese High Level Inputs are for receivers that do not have line-level ? pre-amp out? or ? subwoofer out? ? acks. When a pair of main or satellite speakers are attached to the

20、 OU? PU? terminals, fre? uencies below 180 H?are attenuated by the high-pass filter. 4 Powered SubwooferARC SUB 8 TEST PROCEDURES General Function UU?Unit Under ? est 1.Connect both right and left line level inputs ? RCA? to signal generator and UU? . Use Y-cable if necessary from mono source. VOLUM

21、E control should be full counterclockwise. 2.? urn on generator, ad? ust to 50mV, 50 Hz. ? .Plug in UU? ? red LED should be ON. ? urn VOLUME control full clockwise. ? .LED should turn ? reen? immediate bass response should be heard and felt from port tube opening. 5.? urn off generator, turn VOLUME

22、control fully counterclockwise, disconnect RCA cables. ? .Connect one pair of speaker cables to either high level input terminal on UU? . Cables should be connected to an integrated amplifier fed by the signal generator. 7.? urn on generator and ad? ust so that speaker level output is 2.0V, 50 H? .

23、? urn VOLUME control full clockwise. 8.? reen LED should light, immediate bass response should be heard and felt from the port tube opening. Sweep Function 1.? ollow steps 1-?above, using a sweep generator as a signal source. 2.Sweep generator from 20H?to ? 00H? . Listen to the cabinet and drivers f

24、or any rattles, clicks, bu? ? es or any other noises. If any unusual noises are heard, remove driver and test. Driver Function 1.Remove driver from cabinet? detach ?and - wire clips. 2.Check DC resistance of driver? it should be 3.2 ohms. ? .Connect a pair of speaker cables to driver terminals. Cabl

25、es should be connected to an integrated amplifier fed by a signal generator and ad? ust so that speaker level output is 5.0V. ? .Sweep generator from 20H?to 1kH? . Listen to driver for any rubbing, bu? ? ing, or other unusual noises. 5 Powered SubwooferARC SUB 8 1. TROUBLE SHOOTING BEFORE OPENING Ch

26、eck connections, control settings, driver and other possible e? ternal problems. If there is Output, determine if all controls and Inputs function properly. Rotate Pots over full range while applying lateral and vertical oscillating forces to locate possible intermittent function. High Level Inputs

27、should be tested individually both differentially ? signal from - to ? with normal output? and in common mode ? signal from low level ground to both ? and - shorted together, giving virtually no output? . While passing a signal, corner drop the enclosure a few inches to e? pose possible intermittent

28、 problems.Check woofer for rubbing of voice coil or tears in cone or surround.Check cabinet forloose e? traneous articles which may have been pushed into front port. 2. REMOVING THE AMPLIFIER. ? here are voltages and hot components at many points in the amplifier which can, if contacted, cause perso

29、nal in? ury.Be e? tremely careful. Any ad? ustments or service procedures that re? uire operation of the amplifier out of its enclosure should be performed only by trained service personnel.Refer to PCB drawings for locations of ha? ards and familiari? e yourself with their locations before starting

30、. A.Remove the subwoofer grille. B.Remove the ? ? ? 1? Black PPH screws attaching the woofer to the cabinet. C.Remove the woofer, unplug the two connecting wires. D.Remove the ? 8? ? screws black pph screws attaching the ampifier assembly to the cabinet. E.Remove the ampifier assembly. F.? or access

31、 to the input panel, first remove the three outer screws. Remove knob and nuts from potentiometers. Cut away the sealant securing the cover to the faceplate. ? he input PCB should now pull out completely. 3. TROUBLE SHOOTING AFTER REMOVAL Verify AC plug is disconnected. See WARNIN? S in section 2. ?

32、 o prevent loose hardware from reducing safety spacings, it is essential that all hardware be replaced in the same manner as it was removed, with lock washers under all nuts, proper tor? ue on screws and thread locking sealer on the transformer nuts. If line core or strain relief are replaced, it is

33、 necessary to seal them completely to panel with an approved conformal coating to prevent air whistling through any openings from woofer pressure. ? o reduce the risk or electric shock and/or fire, replace items as marked on schematic with the safety marking only with the e? act replacements listed

34、in the safety component list, section ? . If e? act replacements are not available, order them from the factory or an authori? ed service center. A.Check fuse ? 1. If blown visually check transformer for discoloration, and large capacitors ? C1, C2? for bulges or venting. Check for shorts with an Oh

35、mmeter, ? see schematic? . B.With ohmmeter, verify voice coil of woofer is ? .2 ohms, and windings of transformer are continuous. C.E? amine board and wiring for obvious damage, broken or poorly soldered connections, or discoloration. D.Repair or replace items identified above. E.? or live power tes

36、ting, attach a ?ohm 100 watt resistor to the output wires. F.If the LED is not on, check for fuse continuity and then for cold solder ? oints on CMC1 and bridge diode. G.With a signal present at the input, the output to the power amp is at pin ? 8 of U1. If the signal is not present at pin 8, there

37、is a problem with preamp section. Most likely, a cold solder ? oint will be the problem. ? rack back the signal path to locate problem. CAUTIONS AND WARNINGS BEFORE THIS AMPLIFIER IS PLUGGED IN, make sure its rated voltage corresponds to the voltage of the AC power source to be employed.Failure to u

38、se the correct voltage could cause damage to the amplifier when the AC power cable is plugged in. Do not exceed the rated voltage by more than 10%; operation below 90% will degrade performance or cause the unit to shut off. 6 Powered SubwooferARC SUB 8 H.If signal present at pin 8, but still no soun

39、d, check for cold solder ? oints on all power resistors, R? a and R? b and the the power amp module. If C2?is blown, C?is not soldered or is defective. Check the signal at R2. On the down signal side, the voltage signal should be very small. If signal is similar on both sides of R2, the amp module i

40、s likely defective. I.If you hear a mechanical clicking noise from the amp module, this indicates that the short circuit protection has been engaged. Check that ? ? , ? ?and ? 5 are soldered correctly. Also check that ? ?is not shorted to power amp case. J.If you have to replace the power module, be

41、 very, very patient with the solder removal from this single sided PCB. COMPLETELY REMOVE SOLDER BEFORE TRYING TO REMOVE THE MODULE! K.Assembly notes. ? op side soldering as below? J5: solder both ends J3: solder both ends J1: solder both ends R48: solder GND end At junction of C7a/C7b: Pin to GND C

42、rossover pot Gnd wire from PDB pad to POT barrel. (Only physical contact required between pot body and faceplate). After repair, inspect for possible safety ha? ards, including loose hardware, missing lock washers, correct fuse and lead dress of primary wires ? these must be held in position with ca

43、ble ties so that they cannot touch secondary components? . With ohmmeter, check that panel is connected to signal ground. It is essential that the following safety insulation test be performed prior to returning the Power Sub-Woofer to the customer, using one of the following methods. A) Insulation

44、Resistance Test With a 500VDC Insulation ? ester, Check insulation from the outer metal contact of the RCA ? ack ? chassis? to the line neutral of AC cord. Resistance should be ? 100M. B) Hi-Pot Test If a UL approved Hi-Pot tester is available, test line ?neutral of AC cord to outer shell of RCA ? a

45、ck ? chassis? at 1100VAC for 2 seconds. Observe all of instrument manufacturer? s instructions and safety warnings in performing this test. Connect sub-woofer system to a music source. Play at high level while checking for air leaks around panel edge, driver, panel ? acks and controls, and voice coi

46、l problems such as rubbing or loose turns. With the crossover fre? uency set to 50H? , very little of the voice content should be heard. 4. REASSEMBLY ? ollow all disassembly instructions in reverse order.If the input plate has been removed, it must be re-sealed with a small bead of silicon seal or

47、air leaks may result. 5. LIST OF SAFETY COMPONENTS REQUIRING EXACT REPLACEMENTS ? 1? use SLOW BLO 0.5A 250v ?type UL approved CMC1mc? ? ? 8 Neosid 28-52, 2?2.2mH ? 2?awg ? 2?2? L1mc? ? ? ?Neosid ? 2-19 200uH ? 18SNSR ? ? ? 1? ransformer ? ? ? 00, Use only factory replacement PWR CORDSP? -2 better with polari? ed plug, UL appoved wired with the hot side to fused side. Use with UL approved panel strain relief only