JVC-RCW305-cs-sch 维修电路原理图.pdf

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1、SERVICE MANUALRADIO CASSETTE RECORDERRC-W305No: 28223SEP. 2005COPYRIGHT 2005 JVC ASIA PTE LTD Area Suffix U - Asia UX - Middle East SERVICE POLICY No service part is available for this model. Based on One to One exchange policy.ContentsSafety Precaution.2Preventing Static Electricity.3Disassembly Me

2、thod .4Adjustment Method.5Description Of Major IC.8Voltage Charts.12Wiring Connection Diagram.13Schematic Diagram .14Printed Circuit Board.15RadioFans.CN 收音机爱 好者资料库XL-SV320SL/SV305GDXL-SV308BU2RC-W3051.This design of this product contains special hardware and many circuits and components specially f

3、orsafety purposes. For continued protection, no changes should be made ti the original design unlessauthorised in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personel only.2. Alterations of the des

4、ign or circuitry of the product should not be made. Any design alterations of the product should not be made. Any design alterations or additions will void the manufacturers warrantyand will further relieve the manufacturer of responsibility for personal injury or property damageresulting therefrom.

5、3.Many eletrical and mechanical parts in the products have special safety-related characteristics.These characteristics are often not evident from visual inspection nor can the protection afforded bythem necessarily be obtain by using replaement components rated for higher voltage, the PartsList of

6、Service manual. Electrical components having such features ate identified by the shading on the schematics and by ( ! ) on the parts List in the Service Manual. The use of a substituterepalcement which does not have the same safety characteristics as the recommended replacement parts shown in the Pa

7、rts List of Service manual may create shock, fire, or other hazards.4.The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts, high temperatures parts, moving parts and/or sharp edges for the prevention of electric shcok and

8、fire hazard. When service is required, the original leat routing and dress should be observed, and it should be confirmed that they have been returned to normal, afterre-assembling.5.Leakage current check (Electrical Shock hazard testing)After re-assembling the product, always perform an isolation c

9、heck on the exposed metap Parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.)to be sure the product is safe to operate without danger of electrical shock.Do not use a line isloation transformer during this check.Plug the AC line cord dire

10、ctly into the AC outlet. Using a Leakage Current Tester, measure theleakage current from each ecposed metal parts of the cabinet, particularly and exposed metalpart having a return path to the chassis, to a known good earth ground. Any leakage current mustnot exceed 0.5mA AC (r.m.s.)Alternate check

11、methodPlug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms pervolt or more sensitvity in the following manner. Connect a 1,500 ohm 10W resistor paralleled by a0.15uF AC-type capacitor between an exposedmetal part and a known good earth ground.Measure the AC volta

12、ge across the resistor withthe AC voltmeter.Move the resistor connection to each exposedmetal part, particularly and exposed metal parthaving a return path to te chassis andmeasure the AC voltage across the resistor. Now,reverse the plug in the AC outlet and repeateach measurement. Voltage measured

13、Any mustnot exceed 0.75 V AC (r.m.s.). This correspondsto 0.5 mA AC (r.m.s.).1.This equipment has been designed and manufactured to meet international safety standards.2.It is the legal responsibility of the repairer to ensure that these safety standards are maintained.3.repairs must be made in acco

14、rdance with the relevant safety standards.4.It is essential that safety critical components are replaced by approved parts.5.It mains voltage selector is provided, check setting for local voltage.CAUTIONBurrs formed during moulding may be left over on some parts of the chassis. Therefore,pay attenti

15、on to such burrs in the case of performing repair of this system.Safety PrecautionsWarningRadioFans.CN 收音机爱 好者资料库RC-W3053Preventing static electricityElectrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged,can destroy the laser diode in the

16、traverse unit (optical pcikup). Take care to prevent this when performing repairs.1.1. Grounding to prevent damage by static electricityStatic electricity in the work area can destroy the optical pickup in devicessuch.Be careful to use proper grounding in the area where repairs are being performed.1

17、.1.1. Gound the workbench1. Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate overit before placing the traverse unit (optical pickup) on it.1.1.2. Ground yourself1.Use an anti-static wrist starp to release and static electricity built up in your body.X

18、L-SV320SL/SV305GDXL-SV308BU4RC-W305? ? ? ? ? Disassembly MethodRemove the back cabinet1, Open the battery cover and remove 2 screws inside it. (Screw A)Screw A2, Remove 5 screws on back side. (Screw B)Screw BThen the unit would be disassembled.RC-W3055? ? ? ? ? Adjustment MethodInstrument requiredPr

19、ecautions for alignment1Direct connect to the IF sweeper output1Low frequency oscillator side and 1 UF and 22 Kohm connect to the This oscillator should have a capacity to outputsweeper input side . Same as FIG1 .0dB to 600? at an oscillation frequency of50Hz-20KHzIC101PIN182Electronic voltmeter3Dis

20、tortion meter4Frequency counter5Wow & flutter meter6Test tape2The IF sweeper output level should be made asTCC-112 : Tape speed and running unevenness (3KHz)low as possible within the adjustable range .TCC-140 : Reference level (1KHz)3Since the IF sweeper is a fixed device , there is no TCC-182A : H

21、ead angle (8KHz) , playback frequencyneed to adjust this sweeper . characteristics (1KHz) and dubbing frequency4Since a ceramic oscillator is used , there is no need characteristics (125Hz and 8KHz)to perform any MIX adjustment . 5Since a fixed coil is used , there is no need to 7Blank tapeadjust th

22、e FM tracking .TYPE I : TDK-D606The input and output earth systems are separated .In case of simultaneously measuring the voltage in8Torque gauge : For play and back tensionboth of the input and output systems with anFWD(CT-120m) , and FF/REW(CT-F)electronic voltmeter for two channels , therefore ,

23、the earth should be connected particularly carefully .General conditions 7 For connecting a dummy resistor when measuring the output , use the wire with a greater code size .Power supply voltage - RC-S20RC-S205 5( U ) AC 110V/220V 60Hz/50 8 Whenever any mixed tape is used , use the band Reference ou

24、tput - Speaker : 0.63V/8?pass filter (DV-12V) Headphone : 0.245V/32?playback characteristicsMeasurement output terminal - Speaker CN301* Load resistance - 8?Tuner conditionsAM frequency - 400HzAM modulation - 30%FM frequency - 1 KHzFM frequency deviation - 22.5KHzReference measurement - 26.1mV(0.63V

25、/8?)outputInput positions - AM : Standard loop antenna FM : TP2 (hot) and TP3 (GND)Reference measurement - 26.1mV(0.63V/8?)outputInput positions - AM : Standard loop antenna FM : TP2 (hot) and TP3 (GND)XL-SV320SL/SV305GDXL-SV308BU6RC-W305TUNER ADJUSTMENTSTUNER ADJUSTMENTS Use a plastic screw driver

26、for adjustments. Adjust the intermediate frequency of AM and FM to the frequency of ceramic filter. Set of unit Use a plastic screw driver for adjustments. Adjust the intermediate frequency of AM and FM to the frequency of ceramic filter. Set of unit Supply voltage : DC 9.0V Speaker impedance :8 ohm

27、s Standard output : 50 mW Function switch : RADIOa. Parts Location b. MW Adjustmenta. Parts Location b. MW AdjustmentBand switch : MWAdjusting Connections SGPosition ofVTVMCircuitlnputOutputFrequencyTuning dialOscilloscopeAdjusting Connections SGPosition ofVTVMCircuitlnputOutputFrequencyTuning dialO

28、scilloscope Connect sweep1 1IFgenerator to IC101 455KHzLowT102(18)PIN(A) 2 2TuningConnect AM SG toConnect VTVM to 515 KHz Low end T1043 3 coverage loop ANTspeaker terminals. 1640 KHz High end TC1024 4Connect AM SG toConnect VTVM to 600 KHz600 KHzMW ANT COIL5 5 loop ANT speaker terminals1400 KHz1400

29、KHzPVC101-C3 c. SW Adjustmen c. SW Adjustmen t tBand switch : SW1 SW Dummy antenna : 75 ohms unbalanceAdjusting Connections SGPosition ofVTVMCircuitlnputOutputFrequencyTuning dialOscilloscope1Adjusting Connections SGPosition ofVTVMCircuitlnputOutputFrequencyTuning dialOscilloscope1Tuning Connect AM

30、SG toConnect VTVM to5.8 MHzLow end T1052 2coverageFM ANT & D105(-)speaker terminals.15.4 MHzHigh end TC1033 3Connect AM SG toConnect VTVM to7.0 MHz7.0 MHz T1074 4FM ANT &D105(-)speaker terminals.12.0 MHz16.0 MHzTC101 d. SW Adjustmen d. SW Adjustmen t tBand switch : SW2 SW Dummy antenna : 75 ohms unb

31、alanceAdjusting Connections SGPosition ofVTVMCircuitlnputOutputFrequencyTuning dialOscilloscope1Adjusting Connections SGPosition ofVTVMCircuitlnputOutputFrequencyTuning dialOscilloscope1Tuning Connect AM SG toConnect VTVM to14.8 MHzLow end T1062 2coverageFM ANT & D105(-)speaker terminals.22.4 MHzHig

32、h end TC1043 3Connect AM SG toConnect VTVM to15.0 MHz15.0 MHz T1084 4FM ANT &D105(-)speaker terminals.22.0 MHz22.0 MHzPVC101-C4StepAdjustmentStepAdjustment Connect AM sweep generator to loop ANT.Max.Max.TrackingSteStep pAdjustmenAdjustmenTrackingMax.Max.TC102TC103TC104T106C1T101T107C2T105T104C4C3L10

33、2L103T108TC101T103T102SteStep pAdjustmenAdjustmenTrackingMax.Max.RC-W3057 e. FM Adjustment e. FM AdjustmentBand switch : FM FM Dummy antenna : 75 ohms unbalance Adjusting Connectionposition ofVTVM CircuitInputOutputtuning dialOscilloscope Adjusting Connectionposition ofVTVM CircuitInputOutputtuning

34、dialOscilloscope Connect sweep1 1IFgenerator to IC10110.7 MHzLowT101 T103(18)PIN(A) 2 2Tuning Connect FM SG toConnect VTVM to 87.4 MHzLow end L1033 3coverageFM ANT & D105(-)speaker terminals.108.4 MHzHigh end PVC101-C14 4Connect FM SG toConnect VTVM to90.0 MHz90.0 MHz L1025 5FM ANT &D105(-)speaker t

35、erminals.106.0 MHz106.0 MHzPVC101-C2 偩.TAPE DECK ADJUSTMENTS 1. HEAD REPLACEMENT After replacement, demagnetize. the heads by using a degausser. Be sure to clean the head before attempting to make any adjustments. All wiring should be returned to the original position after work is completed. 2. HEA

36、D AZIMUTH ADJUSTMENT (1) Load the test tape(VTT-703, etc., 10 KHZ) for azimuth adjustment. (2) Press the PLAY button. (3) Use a cross-tip screwdriver to turn the screw for azimuth adjustment so that the left and right output are maximized (4) Press the STOP button. (5) After completion of the adjust

37、ment, use thread lock(TB-1401B) to secure the azimuth-adjustment screw. 3. MOTOR SPEED ADJUSTMENT (1) Insert the test tape(MTT-111N, etc., 3,000 HZ) (2) Press the PLAY button. (3) Use a flat-tip screwdriver to turn the SVR(located inside the rear of the motor) to adjust SVR so that the frequency cou

38、nter become 3,000 HZ 4. CHECKING THE MECHANISM TORQUSE AND TENSION Clean the head, capstan and pinch roller making any measurement.MeasurementTake-up torqe Back tensionTape tension Drive-power cassetteCassette ofr PLAY:TW-211A PLAY: TW-2111Ameasurement F.FWD/REW:TW-2231 TW-2412PLAY 30-60 gr.cm 2.0 -

39、 4.5 gr. cm60 gr or moreF.FWD 55-120 gr.cm - -REW 55-120 gr.cm - -StepSG FrequencyStepSG FrequencyTrackingMax.Max.AdjustmentAdjustment Connect sweepgenerator to IC101(24)pin (B)XL-SV320SL/SV305GDXL-SV308BU8RC-W305LA1824 Block Diagram? ? ? ? ? Description of Major ICRC-W3059BA3308 Block DiagramXL-SV3

40、20SL/SV305GDXL-SV308BU10RC-W305Block DiagramBA3416BLRC-W30511XL-SV320SL/SV305GDXL-SV308BU12RC-W305? ? ? ? ? Voltage ChartsIC No.Item 12345678910111213141516171819DC9V 0.041.313.044.374.37 0.004.370.10 2.841.30 1.300.174.37 3.653.661.221.22 1.261.39Item 21222324DC9V 4.344.34 0.000.29IC No.Item 123456

41、78910111213141516171819DC9V 1.291.29 4.614.62 4.620.00 4.62 1.253.38 1.291.290.694.62 3.010.001.26 1.251.260.48Item 21222324DC9V 4.624.62 0.000.00IC No.Item 12345678910111213141516171819DC9V 1.291.29 4.594.61 4.610.00 4.61 1.233.351.29 1.290.554.61 3.000.001.261.25 1.260.40Item 21222324DC9V 4.614.61

42、 0.000.00IC No.Item 12345678910111213141516171819DC9V 1.291.29 4.61 4.634.630.00 4.631.213.38 1.291.290.57 4.633.020.0 1.261.25 1.260.41Item 21222324DC9V 4.634.630.000.00IC No.Item 123456789101112DC9V 10.035.12 9.201.190.00 10.030.000.00 1.199.185.1310.16IC No.Item 123456789101112DC9V 9.304.77 8.471

43、.20 0.009.32 0.000.00 1.208.49 4.709.32IC No.Item 123456789101112131415161718DC9V 0.990.00 0.000.00 2.16 2.145.501.875.13 1.070.00 1.310.590.590.00 0.000.000.00IC No.Item 123456789101112131415161718DC9V 0.060.00 0.000.00 2.16 2.155.50 0.675.14 1.070.001.310.59 0.590.000.000.00 0.00IC No.Item 1234567

44、89DC9V 0.950.00 0.920.46 0.00 0.000.900.000.89IC No.Item 123456789DC9V 1.800.00 1.805.06 0.00 0.001.790.001.78Transistor No.Item EBCEBCVotage(v) 6.106.80 9.356.106.809.05IC303 LA-4227 CASS PLAY IC301 BA3416 B CASS PLAYIC302 BA3308 CASS RECQ401 (CASS PLAY)IC101 LA-1824 TUNER SW2IC301 BA3416 A CASS PL

45、AYQ401 (TUNER)IC101 LA-1824 TUNER FM IC101 LA-1824 TUNER AM IC101 LA-1824 TUNER SW1IC303 LA-4227 TUNER IC302 BA3308 CASS PLAYRC-W30513? ? ? ? ? Wiring Connections DiagramXL-SV320SL/SV305GDXL-SV308BU14RC-W305? ? ? ? ? Schematic DiagramRC-W30515? ? ? ? ? Printed Circuit BoardXL-SV320SL/SV305GDXL-SV308BU16RC-W305RC-W30517JVC Asia Pte Ltd101 Thomson Road, #28-04 United Squares, Singapore 307591(No: 28223)Printed in Singapore200505(L)