Jvc-PCX-290-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL COPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LIMITED No.MB201 2004/4 CD PORTABLE COMPONENT SYSTEM MB20120044 PC-X290 TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、. 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、 . 1-3 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. . . . . . . . 1-3 SP-PCX290CA-PCX290SP-PCX290 SENSOR TAPEAUX PLAY REC PLAY PHONES P R E S E T U P / R E P E A T P R O G R A M / S E T N W O D T E S E R P O R T N I Y A L P S I D CD/ RANDOM TUNER/ BAND PLAYREWFFPAUSEPLAYREWFFSTOP/EJECTPAUSEREC - + CD SYNCHRO RECORDINGAUTO STOP SYSTEM CD PORTABLE CO

5、MPONENT SYSTEM STOP/EJECT STANDBY AB VOLUME H B S / P R E S E T E Q STANDBY/ON FM MODE TAPE CD/ RANDOM TUNER/ BAND Area suffix J - U.S.A. C - Canada SERVICE POLICY No service part is available for this model. Exchange only. RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB201) SPECIFICATION Designs and specificati

6、ons are subject to change without notice. AmplifierOutput Power5 W per channel, min. RMS, driven into 3.2 at 1 kHz with no more than 10% total harmonic distortion. Audio input sensitivity/Impedance (at 1 kHz) AUX:1 000 mV/47 k Speakers/Impedance3.2 - 8 TunerFM tuning range87.5 MHz - 108.0 MHz AM tun

7、ing range530 kHz - 1 710 kHz CD playerCD Capacity1 CD Dynamic range60 dB Signal-to-noise ratio75 dB Cassette deck Frequency response Normal (type I)50 Hz - 10 000 Hz Wow and flutter:0.15% (WRMS) GeneralPower requirementsAC 120 V , 60 Hz DC 12 V (R20(SUM-1)/D(13D) batteries (8) Power consumption20 W

8、(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 (approx.)4.1 kg (9.1 lbs) SpeakerType2-way bass-reflex type Speaker unitsWoofer: 10 cm (4 in.) cone 1 Tweeter: 5 cm (2 in.) cone 1 Power handling capacity5 W Impedance3.2 Freque

9、ncy range50 Hz - 18 000 Hz Dimensions (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 lbs) each RadioFans.CN 收音机爱 好者资料库 (No.MB201)1-3 SECTION 1 PRECAUTION This service manual does not describe PRECAUTION. SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This servi

10、ce manual does not describe SPECIFIC SERVICE INSTRUCTIONS. SECTION 3 DISASSEMBLY This service manual does not describe DISASSEMBLY. SECTION 4 ADJUSTMENT This service manual does not describe ADJUSTMENT. SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING. RadioFans.CN 收音机

11、爱 好者资料库 (No.MB201) AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan VICTOR COMPANY OF JAPAN, LIMITED WPC Printed in Japan PC-X290 HYPER-BASS SOUND HYPER-BASS SOUND Areas Suffix J.USA C.Canada Contents Page Safety precautions. 2 Exploded vie

12、w.35 Block diagram . 3 Mechanical parts list.37 Disassembly instructions. 4 Electrolytic parts list .40 Troubleshooting . 5 IC lead identification Main adjustment. 7 and transistor pin out diagrams .51 Wiring connections. 11 Voltage charts.60 Printed circuit boards. 12 Illustration of Packing and Pa

13、rts 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 PORTABLE COMPONENT SYSTEM 2 1. This design of this product contains special hardware and many circuits and components speciall

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

15、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 warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting the

16、re from. 3. Many electrical 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 by them necessarily be obtained by using replacement components rated for higher voltage, t

17、he 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 of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts sho

18、wn 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 like to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electri

19、c 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 re-assembling. 5. Leakage current check (Electrical Shock hazard testing) After re-assembling the product, always perfor

20、m 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 is safe to operate without danger of electrical shock. Do not use a line isolation transformer during this check. Plug th

21、e 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 metal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC

22、(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. Connect a 1,500 10W resistor paralleled by a 0.15F AC-type capacitor between an exposed metal part and a known good earth gr

23、ound. 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 path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat e

24、ach 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 meet international safety standards. 2. It is the legal responsibility of the repairer to ensure that these safety standar

25、ds 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. If mains voltage selector is provided, check setting for local voltage. CAUTION Burrs formed during molding may be left o

26、ver on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system. 0.15F AC TYPE 1500 10W Place this probe on each exposed metal part. Good earth ground AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity PC-X290 30/MAR/200 4 Safety Precau

27、tions 3 BLOCK DIAGRAM Tuner TA2149 PLL TC9257 LCD Display Back Light MCU/CD TC94A09 Remote Control Key Board Remote sensor CD Pick Up CD RF AMP TA2153FN Source Selector TC9422 Power AMP TA8229PK Speaker Main Voltage Regulator Rectifier Power Supply CD/MCU Voltage Regulator AC IN CD Servo TA2092 For

28、Tuner For Tape For MCU/CD AUX IN TapeB Deck TapeA Deck Tape Section TA8189N Phone PC-X290 30/MAR/2004 4 DISASSEMBLY INSTRUCTIONS A B This Class B digital apparatus complies with Canadian ICES-003. Cet appareil numerique de la classe B est conforme a la norme NMB-003 du Canada. CC C OPENOPEN AC IN DO

29、 NOT USE THIS UNIT IN DIRECT SUNLIGHT OR LEAVE THE UNIT IN CLOSED AUTOMOBILES (OR YACHTS, ETC.) WHERE IT WOULD BE EXPOSED TO THE HIGH TEMPERATURE (ABOVE 40 C (104 F) RL BEAT CUTRESET 12 RL AUX IN ANT. SCREW SPEAKER IMPEDANCE MIN 3.2 DD D D D D D Removing Left and Right and Top side and back side Rem

30、ove 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 volume control: Set the volume con

31、trol 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 reposition the unit. Defect in

32、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 and Adjustment”). Defective IC

33、101: 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. Defective band selector swit

34、ch: 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 or repair as required. Tape No

35、 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. Cassette erasure prevention tabs

36、 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: Use a new disc. PC-X290 30/

37、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 necessary. Defective IC301: Che

38、ck 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 adjustment 1. AM Signal generato

39、r 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 meter 9. Torque gauge (cassett

40、e 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 instruments Radio section FM 1

41、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 H. Phone output 10 dB (0.245

42、V)/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: MTT113CN (8 kHz) Signal out

43、put 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 this adjustment, lock the head

44、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 Head azimuth adjusting screw (To be used only after head replacem