JVC-PCX350-cs-sm维修电路原理图.pdf

PC-XC350 SERVICE MANUAL CD PORTABLE COMPONEMT SYSTEM PC-XC350 contents Safety precaution - 1-2 Block/Wiring Diagram - 1-16 Disassembly method - 1-4 Circuit Diagram - 1-18 Adjustment method - 1-6 PCB drawing - 1-20 TOC read - 1-11 Assembly - 1-22 Major IC Description -1-12 Packing - 1-32 No. xxxxx COPYRIGHT 2001 VICTOR COMPANY OF JAPAN,LTD (By JCA) OCT 2001 Area Suffix J-USA C-CANADA Unit No. SP-PCXC350 Unit No. SP-PCXC350 Unit No. SP-PCXC350 RadioFans.CN 收音机爱 好者资料库 PC-XC350 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 ti the original design unless authorised 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 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 manufacturers warranty and will further relieve the manufacturer of responsibility for personal injury or property damage resulting therefrom. 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 by them necessarily be obtain by using replaement components rated for higher voltage, the Parts List of 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 substitute repalcement 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, 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 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, after re-assembling. 5.Leakage current check (Electrical Shock hazard testing) After re-assembling the product, always perform an isolation check 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 directly into the AC outlet. Using a Leakage Current Tester, measure the leakage current from each ecposed 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 (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 sensitvity in the following manner. Connect a 1,500 ohm 10W resistor paralleled by a 0.15uF 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 each exposed metal part, particularly and exposed metal part having a return path to te 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.). 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 accordance 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 attention to such burrs in the case of performing repair of this system. Safety Precautions Warning 1 - 2 RadioFans.CN 收音机爱 好者资料库 PC-XC350 Preventing static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pcikup). Take care to prevent this when performing repairs. 1.1. Grounding to prevent damage by static electricity Static electricity in the work area can destroy the optical pickup (laser diode) in devicessuch as DVD players. Be careful to use proper grounding in the area where repairs are being performed. 1.1.1. Gound the workbench 1. Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it. 1.1.2. Ground yourself 1.Use an anti-static wrist starp to release and static electricity built up in your body. 1.1.3. Handling the optical pcikup 1. In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are storted. After replacement, return the shorted parts to their original condition. (Refer to the text.) 2. Do not use a tester to check the condition of the laserdiode in the optical pickup. The testers internal power source can easily destory the laser diode. 1.2. Handling the traverse unit (optical pickup) 1.Do not subject the traverse unit (optical pcikup) to strong shocks, as it is a sensitive, complex unit. 2.Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the replacement procdeure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching itto the connector. 3.Handle the flexible cable carefully as it may break when subjected to strong force. 4.It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not return it. 1 - 3 PC-XC350 Disaeesmbly method Removing the rear panel 1. From behind the body, remove the eight screws A retaining the rear panel. 2. Then remove the two screws B retaining the rear panel. 3. Take out the rear panel from the body. Note: Be careful of the FM antenna white wire, it is connection with the tuner PCB up side. You can directly take out from the tuner PCB. When you re-assembly the product, plug the FM antenna white wire into the Tuner PCBs FM ANT position. 1 - 4 Screw A. Screw A. Screw B. PC-XC350 Removing the CD mechanism E 1.Remove the rear panel 2.Removing the two screws E retaing the 3CD mechanism cover. 3.Removing the crew F retaing the control PCB left side. E 4.Remove the srews G retaing on the 3CD mechanism cover & the two screws H retaining on the control PCB F G H Removing the Main PCB 1.Remove rear panel 2.Remove the 3CD mechanism 3.Remove the four screws attaching the main PCB. 1 - 5 PC-XC350 Adjustment method Measurement instruments required for Tuner section adjustment Voltage applied to tuner - +B:DC 5.7V 1.Low frequency oscillatorVT: FM 25v / am 1.57.5v This oscillator should have a capacity to outputReference measurement - 26.1mV(0.866/3 0dB to 600 at an oscillation frequency ofoutput 50Hz-20KHzInput positions - AM : Standard loop antenna FM : TP1 (hot) and TP2 (GND) 2.Electronic voltmeter 3.Distorion meter 4.Frequency counterStandard measurement position of volumett 5.Wow & flutter meter 6.Test tapeBass - Off TCC-112: tape speed and running unevenness (3KHz)EQ - Flat TCC-140: Reference level (1KHz)UP and down adjustment of volume - Vol : 16 TCC-182A: Head angle (8KHz), playback frequency characteristics (1KHz) and dubbing frequencyPrecautions for measurement charateristics (125Hz and 8KHz)1.Direct connect to the IF sweeper output side and 1 UF and 22 Kohm connect to the 7.Black tapesweeper input side. Same as FIG. 1. TYPE I : TDK-D60 8.Torque gauge : For play and tension FWD(CT-120m), and FF/REW(CT-F) Measurement conditions Power supply voltage-AC 120V (60Hz) Reference output-Speaker : 0.866V/32.The IF sweeper output level should be made as Headphone : 0.245V/32low as possible within the adjusttable range. Reference frequency and -1KHz, AUX : 450mV3.Since the IF sweeper is a fixed device, there is no input levelneed to adjust this sweeper. Input for confirming recording and-CD : -10dB4.Since a ceramic oscillator is used, there is no need playback characteristicsto perform and MIX adjustment. Measurement output terminal-Speaker CN3015.Since a fixed coil is used, there is no need to *Load resistance-3adjust the FM tracking. 6.The input and output earth systems are separated. In case of simuitaneously measuring the voltage in Radio Input signalboth of the input and output systems with an electronic voltmeter for two channels, therefore, the AM frequency -400Hzearth should be connected particularly carefully. AM modulation-30%7.In the case of BTL connection amp., the minus FM frequency -1 KHzterminal of speaker is not for earthing. Therefore, be FM frequency deviation -22.5KHzsure not to connect any other earth terminal to this terminal. This system is of an BTL system. 8.For connecting a dummy resistor when measuring the output, use the wire with a greater code sze. 9.Whenever any mixed tape is used, use the band pass filter (DV-12V) 1 - 6 PC-XC350 TUNER ADJUSTMENT use a plastic screews driver for adjustments. Adjust the intermediate frequency of AM and FM to the frequency of cermic filter. Supply voltage:DC 12.0V Speaker impedance:3 OHMS Function switch:RADIO a.AM adjustmentBAND SELECT SWITCH : AM steAdjustingTuningAdjustment circuitFrequencyMeasurement inputMeasurementoutputparts 1IF1000 KHzAM SweepLoopVTVMTP16 (H)T103 (450 KHz)GeneratorANTOscilloscopeTP 8 (E) 2Tuning530 KHzDigitalTP16 (H)T102 3Coverage1710 KHz VoltmeterTP 8 (E) 4Tracking600 KHzAm signalLoopVTVMTP12 (L)MW COIL 51500 KHzGeneratorANTOscilloscopeTP11 (R)CT102 b.FM AdjustmentBAND SELECT SWITCH : FM FM Dummy Antenna : 75 ohm unbalance steAdjustingTuningAdjustment circuitFrequencyMeasurement inputMeasurementoutputparts 1IFFM SweepTP4 (H)VTVMTP16 (H) (10.7 MHz)98.0 MHzGeneratorTP8 (E)OscilloscopeTP8(E)T104 2Tuning87.5 MHzDigitalTP16 (H) 3Coversage108 MHz-VoltmeterTP8(E)L104 4Tracking90.0 MHzFM SignalFM ANTVTVMTP12 (L)L103 5106.0 MHzGeneratorTP1(E)OscilloscopeTP11 (R) Input ConnectionOutput ConnectionVTVM Oscilloscope near by effective 1.2+/-0.05V Confirm 7.0+/-0.5V Maximum sensitvity Output ConnectionInput ConnectionVTVM Oscilloscope Confirm 1.4+/-0.1V 5.6+/-0.5V Confirm with being 1 - 7 PC-XC350 ARRANGEMENT OF ADJUSTMENTS POSITION 1 - 8 PC-XC350 Tape recorder section ItemsMeasurementMeasurement methodStandardAdjusting conditionsValuesposition ConfirmationTest tape1 Playback the test tape TCC-182A (8KHz)MaximumAdjust the head of head angle: TCC-182A(8KHz)2 With the recording & playback mechanism,outputazimuth screw Measurement output adjust the head azimuth screw so that the only terminal left and right output leavers become : Speaker terminal maximum, After adjustment, lock the head Speaker R/L azimuth at least by half turn. (Load resistance: 3 : Headphone terminal ConfirmationTest tapeAdjust VR401 so that the frequency counterTape speedVR401 of tape speed: TCC-112 (3KHz)reading becomes 3,010Hz +/-15Hz whenof deck playing back the test tape TCC-112 (3KHz) with:3,010Hz playback and recording mechanism after+/-15Hz Measurement outputending forward winding of the tape. terminal : Headphone terminal Referemce Values for Confirmation Items ItemsMeasurement Measurement method StandardAdjusting conditionsValuesposition Wow & flutterTest tapeWhen the test tape TCC-112 (3KHz) has been0.25% or :TCC-112(3KHz)played back with the recording and playbackless mechanism at the beginning of forward(WRMS) winding, the frequency counter reading of Measurement outputwow & flutter should be 0.25% or less terminal(WRMS). :Headphone terminal 1 - 9 PC-XC350 Electrical Performance ItemsMeasurementMeasurement methodStandardAdjusting conditionsValuesposition Adjustment ofMode: Playback1 With the recording and playback recording blas mode mechanism, load the test tapesTDK-D60 currentRecording mode TDK-D60, and set the mechanism to the 4.5 uA (ReferenceTest tape recording and pausing condition in advance.+/-0.5uA Value)TDK-D60 Measurement output2 After connecting 100 in series to the terminal recorder head, measure the blas current : Both recording and with a valve voltmeter at both of the headphone terminals terminals Adjustment ofReference frequency1 with the recording and playbackOutput recording and :1KHz and 8KHz mechanism, load the test tapes (TDK-D60)deviation palyback (REF.:-10dB)and set the mechanism to the between frequencyTest tape recording and pausing condition in 1KHz and characteristicsTDK-D60 advance8KHz Measurement input2 While repetitively inputting the reference:-1dB +/-2dB terminal frequency signal of 1KHz and 8KHz from : OSC IN OSC IN, record andplayback the tape. 3 While recording and playback the test tape Lch and Rch so that the output deviation between 1KHz and 8KHz from -1dB +/-2dB Reference Values for Electrical Function Confirmation Items ItemsMeasurementMeasurement methodStandardAdjusting conditionsValuesposition RecordingPlayback1 While changing over t and form BIAS 164KHzT201 blasTest tape and 2, confirm that the frequency is +/-6KHz frequencyTDK-D60 changed. Measurement2 With the recording and playback terminal : BIAS TP on mechanism, load the test tape. P.C. board (TDK-D60), and set the mechanism to the recording and pausing condition in advance. 3 Confirm that the BIAS TP frequency on the P.C. board is 64KHz +/-6KHz 1-10 PC-XC350 1-11 PC-XC350 DESCRIPTION OF MAJOR IC TA2104BN (IC101) AM/FM 1 CHIP TUNER Block Diagram 1-12 PC-XC350 AN7345K (IC201) DUAL RECORD/PLAYBACK PRE-AMPLIFIER Block Diagram 1-13 PC-XC350 1 - 14 PC-XC350 1 - 15 PC-XC350 BLOCK DIAGRAM 1 - 16 PC-XC350 WIRING DIAGRAM 1-17 1 2 3 4 5 6 7 8 9 BA3126NIC202 R219 220 R215 18K R216 18K C230 100U C201332M C240332M C228 500P C229 500P R220 1K R221 1K A C224332M C206 333M C241 222M C238102M C222 393M C226 102M C505 102M C233 223M C509 683M C302 823M C301 823M R504 1K5 R227100 R308 180K R20422 R210 1K5 R202