JVC-PCX290-cs-sm 维修电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB2012004/4CD PORTABLE COMPONENT SYSTEMMB20120044PC-X290TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SP

2、ECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34ADJ

3、USTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. . 1-3SP-PCX290CA-PCX290SP-PCX290SENSORTAPEAUXPLAYRECPLAYPHONESPRESETUP/REPEATPROGRAM/SETNWODTESERPORTNIYALPSIDCD/RANDOMTUNER/BANDPLAYREWFFPAUSEPLAYREWFFSTOP/EJECTPAUSEREC-+CD SYNCHRO RECORDINGAUTO STOP SYSTEMCD PORTABLE COMPONENT SYSTEM STOP/EJECTSTANDBYABVOLUMEHBS/PRESETEQSTANDBY/ONFM MODETAPECD/

5、RANDOMTUNER/BANDArea suffixJ - U.S.A.C - CanadaSERVICE POLICYNo service part is available for this model.Exchange only.RadioFans.CN 收音机爱 好者资料库1-2 (No.MB201)SPECIFICATIONDesigns and specifications are subject to change without notice.AmplifierOutput Power5 W per channel, min. RMS, driven into 3.2 at

6、1 kHz with no more than10% total harmonic distortion.Audio input sensitivity/Impedance (at 1 kHz) AUX:1 000 mV/47 kSpeakers/Impedance3.2 - 8 TunerFM tuning range87.5 MHz - 108.0 MHzAM tuning range530 kHz - 1 710 kHzCD playerCD Capacity1 CDDynamic range60 dBSignal-to-noise ratio75 dBCassette deck Fre

7、quency response Normal (type I)50 Hz - 10 000 HzWow and flutter:0.15% (WRMS)GeneralPower requirementsAC 120 V , 60 HzDC 12 V (R20(SUM-1)/D(13D) batteries (8)Power consumption20 W (at operation)3 W (on standby)Dimensions (approx.)270 mm 274 mm 298 mm (W/H/D) (10 11/16 in. 10 3/4 in. 11 3/4 in.)Mass (

8、approx.)4.1 kg (9.1 lbs)SpeakerType2-way bass-reflex typeSpeaker unitsWoofer: 10 cm (4 in.) cone 1Tweeter: 5 cm (2 in.) cone 1Power handling capacity5 WImpedance3.2 Frequency range50 Hz - 18 000 HzDimensions (approx.)180 mm 270 mm 228 mm (W/H/D) (7 1/8 in. 10 3/4 in. 9 in.)Mass (approx.)1.7 kg (3.8

9、lbs) eachRadioFans.CN 收音机爱 好者资料库(No.MB201)1-3SECTION 1PRECAUTIONThis service manual does not describe PRECAUTION.SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.SECTION 3DISASSEMBLYThis service manual does not describe DISASSEMBLY.SECTION 4AD

10、JUSTMENTThis service manual does not describe ADJUSTMENT.SECTION 5TROUBLESHOOTINGThis service manual does not describe TROUBLESHOOTING.(No.MB201)AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,JapanVICTOR COMPANY OF JAPAN, LIMITEDWPCPrinted in J

11、apan PC-X290 HYPER-BASS SOUNDHYPER-BASS SOUND Areas Suffix J.USA C.Canada Contents Page Safety precautions. 2 Exploded view.35 Block diagram . 3 Mechanical parts list.37 Disassembly instructions. 4 Electrolytic parts list .40 Troubleshooting . 5 IC lead identification Main adjustment. 7 and transist

12、or pin out diagrams .51 Wiring connections. 11 Voltage charts.60 Printed circuit boards. 12 Illustration of Packing and Parts List.62 Schematic diagrams. 30 This service manual is made from 100% recycled paper. COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.No. APR. 2004 PC-X290 SERVICE MANUAL CD PORTA

13、BLE COMPONENT SYSTEM 2 1. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be ident

14、ical to those used in the original circuits. Services should be performed by qualified personnel only. 2. Alterations of the design 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 manufacturer

15、 warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting there from. 3. Many electrical and mechanical parts in the products have special safety-related characteristics. These characteristics are often not evident from visual inspection no

16、r can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, the Parts List of Service manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the parts List in the Service Manual. The use

17、 of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service manual may create shock, fire, or other hazards. 4. The leads in the products are routed and dressed with ties, clamps, tubing, barriers and the li

18、ke to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after

19、 re-assembling. 5. Leakage current check (Electrical Shock hazard testing) After re-assembling the product, always perform an isolation check on the exposed metal Parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product

20、is safe to operate without danger of electrical shock. Do not use a line isolation transformer during this check. Plug the AC line cord directly into the AC outlet. Using a “Leakage Current Tester”, measure the leakage current from each exposed metal parts of the cabinet, particularly and exposed me

21、tal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.) Alternate check method Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more sensitivity in the following manner. Con

22、nect a 1,500 10W resistor paralleled by a 0.15F AC-type capacitor between an exposed metal part and a known good earth ground. Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to eachexposed metal part, particularly any exposed metal part having a return

23、 path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. voltage measured Any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). Warning 1. This equipment has been designed and manufactured to m

24、eet 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 accordance with the relevant safety standards. 4. It is essential that safety critical components are replaced by approved parts. 5.

25、If mains voltage selector is provided, check setting for local voltage. CAUTION Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system. 0.15F AC TYPE1500 10WPlace thisprobe oneach exposedmetal

26、part.Good earth groundAC VOLTMETER (Having 1000 ohms/volts, or more sensitivity PC-X290 30/MAR/2004Safety Precautions 3 BLOCK DIAGRAM TunerTA2149PLLTC9257LCDDisplayBackLightMCU/CDTC94A09RemoteControlKey BoardRemotesensorCD PickUpCD RF AMPTA2153FNSourceSelectorTC9422Power AMPTA8229PKSpeakerMainVoltag

27、eRegulatorRectifierPowerSupplyCD/MCUVoltageRegulatorAC INCD ServoTA2092For TunerFor TapeFor MCU/CDAUX INTapeBDeckTapeADeckTapeSectionTA8189NPhone PC-X290 30/MAR/2004 4 DISASSEMBLY INSTRUCTIONS ABThis Class B digital apparatuscomplies with CanadianICES-003.Cet appareil numerique de laclasse B est con

28、forme a lanorme NMB-003 du Canada.CCCOPENOPENAC INDO NOT USE THIS UNITIN DIRECT SUNLIGHTOR LEAVE THE UNITIN CLOSED AUTOMOBILES(OR YACHTS, ETC.)WHERE IT WOULD BE EXPOSEDTO THE HIGH TEMPERATURE(ABOVE 40 C (104 F)RLBEAT CUTRESET12RLAUX INANT.SCREWSPEAKER IMPEDANCE MIN 3.2DDDDDDDRemoving Left and Right

29、and Top side and back sideRemove all screws on left and right and back side PC-X290 30/MAR/2004 5 TROUBLESHOOTING Circuit Symptom Cause and Remedy General No sound Speakers are not connected: Check the speaker connection. Wrong function is selected: Set switch to the proper position. Defective volum

30、e control: Set the volume control to a proper sound level. Defective earphone jack: Replace the earphone jack. Defect in IC404 Check voltages. Replace if necessary. Defect in IC401 Check voltages. Replace if necessary. MW No sound, weak sound (Low sensitivity) Improper location of unit: Rotate or re

31、position the unit. Defect in IF T101: Check resistance, voltage, and current. Replace as needed. Defect AM antenna coil L103 or oscilloscope coil L104: Replace if necessary. Intermediate Frequency tuning faulty: Readjust (see “Alignment and Adjustment”). RF tracking faulty: Readjust (see Alignment a

32、nd Adjustment”). Defective IC101: Check voltages. Replace if necessary. Defective IC102: Check voltages. Replace if necessary. Poor contact in antenna circuit: Check resistance and resolder. FM No sound, weak sound (Low sensitivity) FM antenna not connected: Connect the built-in or external antenna.

33、 Defective band selector switch: Replace or repair the switch. Defective IC101: Check voltages. Replace if necessary. Defective IC102: Check voltages. Replace if necessary. Intermediate Frequency tuning faulty: Readjust (see “Alignment and Adjustment”). Poor contact in FM antenna circuit: Resolder o

34、r repair as required. Tape No sound/recording, unsteady tape sound, weak sound Dirty capstan or head: Clean the capstan or head with alcohol. Irregular cassette tape winding: Replace tape. Defective IC201: Check voltage. Replace if necessary. Defective L203: Check voltages. Replace if necessary. Cas

35、sette erasure prevention tabs broken out: Replace tape or cover tab openings with adhesive tape. CD Cannot read the table of content. no sound Disc is inserted upside down: Insert disc correctly. Disc is dirty: Wipe clean with a soft cloth. Disc is scratched: Use a new disc. Disc is seriously warped

36、: Use a new disc. PC-X290 30/MAR/2004 6 Circuit Symptom Cause and Remedy CD Cannot read the table of content. no sound A non-standard disc has been inserted: Use only a brand name disc. Moisture has formed inside the CD deck: Wait about 20 to 30 minutes. Defective Q407: Check voltages. Replace if ne

37、cessary. Defective IC301: Check voltages. Replace if necessary. Defective IC302 Check voltages. Replace if necessary. Defective IC303: Check voltages. Replace if necessary. Defect in the CD pickup mechanism: Replace as required. PC-X290 7 Main Adjustments gggg Measuring instructions required for adj

38、ustment 1. AM Signal generator 2. FM Signal generator 3. Inter mediate Frequency sweep generator 4. FM stereo signal generator 5. Low-frequency oscillator (oscillation frequency 50 Hz-20 kHz, 0dB output with 600 ohm impedance) 6. Attenuator (600 ohm impedance) 7. Electronic voltmeter 8. Distortion m

39、eter 9. Torque gauge (cassette for CTG-N) 10. Wow & flutter meter 11. Frequency counter meter Test tape Playback tape MTT-111NS (tape speed, wow flutter) MTT-112BN (reference level) MTT-257C (playback frequency) MTT-113CN Recording tape MTT-501 Power supply voltage AC110V-120V 60Hz gggg Measuring in

40、struments Radio section FM 1 kHz, 22.5 kHz deviation FM STEREO: 1 kHz, 67.5 kHz deviation pilot signal 7.5 kHz. AM: 1 kHz, 30% modulation Reference output: Speaker output: 0dB (2 V)3.2 ohm H. Phone output: - 10 dB (0.245V)/32 ohm Amplifier section Reference output: Speaker output 0 dB (2 V)/ 3.2 ohm

41、 H. Phone output 10 dB (0.245V)/32 ohm CD section Test disc: SONY Yeds 7 Type 3 PHILIPS SBC-444A A-BEX: TCD-731R TCD-712R TCD-785 PC-X290 30/MAR/2004 8 ! Cassette Amplifier Section Item Measuring Condition Check and adjustment procedure Standard value Adjusting part Head azimuth adjustment Test tape

42、: MTT113CN (8 kHz) Signal output terminal: PHONES (with 32 ohm load) 1. Play back the test MTT113CN (8 kHz). 2. Adjust the head azimuth adjusting screw so that the phase difference between the R and L channels is minimized at an output level that is within 2 dB of the maximum output level . After th

43、is adjustment, lock the head azimuth adjusting screw with screw sealant to cover more than a half of the screw head. 3. When the head azimuth is maladjusted, correct it with the head azimuth adjusting screw. Output level: Within 2 dB of maximum output level Phase difference L and R channels: Minimum

44、 Head azimuth adjusting screw (To be used only after head replacement) See Fig 3-1 PB frequency response check Test tape: MTT257C Signal output terminal: PHONES (with 32 ohm load) Play back the test tape MTT257C while con-firming that deviation between the 1 kHz signal and 8 kHz signal should be 0 (

45、+3-6) dB. Deviation between 1 kHz and 8 kHz: 0 (+3-6) dB Bias frequency check Tape: Normal Signal output terminal: Cassette REC./PLAY HEAD Set the TUNER or CD function and with TAPE to record. check to see if the frequency at the measuring point R201 or R202 is 82 kHz 1 kHz. if not adjust L203 until

46、 the frequency counter indicates 82 kHz 1 kHz. L203, R201/R202 See Fig 3-2 REC and PB frequency response adjustment Test tape: MTT-501 Signal input FM22.5 DEV 60dB with Emphasis signal output terminal: PHONES (with 32 ohm load) At TUNER, set the BAND to the FM position, and record the reference 1 kH

47、z signal and 8 kHz signal alternately repeatedly. While playing back the recorded signal differ from that of the 1 kHz signal by within 0 (+3-6) dB. Level difference between REC and PB:Within 0 (+3-6) dB. PC-X290 9 ! Tuner Section Item Measuring Condition Check and adjustment procedure Standard valu

48、e Adjusting part AM IF adjustment Signal input: Loop ANTENNA Signal output: IC101 PIN (16) 1. Set the intermediate frequency sweep generator to AM 450 kHz. 2. Adjust the T101 for maximum and center output T101 See Fig 3-2 AM tracking adjustment Signal input: Loop antenna PHONES (with 32 ohm Load) 1.

49、Set the TUNER at 530 KHz adjust L104 until the test pin of R107 voltage at 1.5 V 0.05V. 2. Set the TUNER at 1710 KHz, Check the pin of R107 Voltage at 7.5V 0.5V. 3. Set the TUNER and S/G at 610KHz, adjust L103 for maximum output. 4. Set the TUNER and S/G at 1400KHz, adjust TC102 for maximum output.

50、5. Repeat the above steps 3 and 4. L104 L103 TC102 See Fig 3-2 FM tracking adjustment Signal input: Antenna Signal output: IC101 PIN (16) 1.Set the TUNER at 87.5MHz adjust L102 until the test pin of R105 voltage at 2.3 V 0.05V. 2.Set the TUNER at 108MHz, Check the pin of R105 Voltage at 7.5V 1V. 3.