JVC-XLPM1-cd-sm 维修电路原理图.pdf

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1、SERVICE MANUALPORTABLE CD PLAYERNo.21018Jul. 2001COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.COMPACTDIGITAL AUDIOCOMPACTDIGITAL AUDIOREPEAT/RANDOMHBS+10GROUPESPRESUMEVolumeDC IN 4.5VOPENLine OutContentsSafety PrecautionsImportant for laser productsPreventing static electricityDisassembly method Trou

2、bleshootingExplanation of MP3Description of major ICsParts list1-21-31-41-51-71-81-91-13 18XL-PM11/XL-PM1XL-PM11/XL-PM1Area SuffixXL-PM1J - U.S.A.C - CanadaB - U.K.E - Continental EuropeXL-PM11C - CanadaArea SuffixXL-PM11Gift boxXL-PM1Blister packPACKINGModel XL-PM11 is an exclusive use for Canada.

3、As for the difference between XL-PM11 and XL-PM1, the packing specification is different. RadioFans.CN 收音机爱 好者资料库XL-PM11/XM-PM11-21. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be ma

4、de 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 the design or circuitry of the product should not be made. Any design alt

5、erations of the product should not be made. Any design alterations or additions will void the manufacturers warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.3. Many electrical and mechanical parts in the products have spec

6、ial 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, wattage, etc. Replacement parts which have these special safety characteris

7、tics are identified in 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 of a substitute replacement which does not have the same safety characteristics as the recommend

8、ed 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 temperature parts, moving parts and/or sharp edges for t

9、he 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 re-assembling.5. Leakage currnet check (Electrical shock hazard testing)After re-assembling the

10、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 is safe to operate without danger of electrical shock.Do not use a line isolation transformer durin

11、g 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 any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage current must no

12、t exceed 0.5mA AC (r.m.s.).Alternate check methodPlug 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 0.15 F AC-type capacitor between an exposed metal part and a k

13、nown good earth ground.Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and meausre the AC voltage across the resistor. Now, reverse the plug in the AC o

14、utlet 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 safet

15、y 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. If mains voltage selector is provided, check setting for local voltage.Good earth groundPlace this probe on each ex

16、posedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE!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.In regard with component parts appearing on

17、 the silk-screen printed side (parts side) of the PWB diagrams, the parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the mark nearby are critical for safety. When replacing them, be sure to use the parts of the same type and rating as specified

18、by the manufacturer. (Except the J and C version)RadioFans.CN 收音机爱 好者资料库XL-PM11/XM-PM11-3Important for laser products1.CLASS 1 LASER PRODUCT2.DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam.3.CAUTION : There are no serviceable parts insid

19、e theLaser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.4.CAUTION : The compact disc player uses invisible laserradiation and is equipped with safety switches which prevent emission of radiation when the drawer is open and the safety interlocks have fai

20、led or are de feated. It is dangerous to defeat the safety switches.5.CAUTION : If safety switches malfunction, the laser is able to function.6.CAUTION : Use of controls, adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.!CAUTIONPle

21、ase use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.WARNING LABELDHHS LABELCLASS 1LASER PRODUCT(Cabinet -bottom)(Cabinet -door/ inside)Reproduction and position of labelsB, E versionJ, C versionXL-PM11/XM-PM11-4Preventing static electricity1. Gr

22、ounding to prevent damage by 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 pickup). Take care to prevent this when performing repairs.2. About the earth

23、processing for the destruction prevention by static electricity In the equipment which uses optical pick-up (laser diode), optical pick-up is destroyed by the static electricity of the work environment.Be careful to use proper grounding in the area where repairs are being performed. 2-1 Ground the w

24、orkbench 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.2-2 Ground yourself Use an anti-static wrist strap to release any static electricity built up in your body. 3. Handling the optica

25、l pickup1. In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted. 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

26、 the laser diode in the optical pickup. The testers internal power source can easily destroy the laser diode. 4. Handling the traverse unit (optical pickup)1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit. 2. Cut off the shorted part of the fl

27、exible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector. 3. Handle the flexible ca

28、ble 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 turn it.Conductive material (conductive sheet) or iron plate(caption)Anti-static wrist strapFlexible boardCD mechanism assemblyshort-circuit land

29、CON1on the main board1.2.3.Remove the door & middle cabinet.Solder the short-circuit land on the flexible board, before the flexible board is removed from connector CON1 on the main board. (When the flexible board is removed without putting up solder, the CD mechanism assembly might destroy.) Please

30、 unsolder the short-circuit land after connecting the flexible board with the CON1 on the main board, when you install CD mechanism assembly in the substrate.Attention when CD mechanism assembly is decomposed*Please refer to Disassembly method in the text for pick-up and how to detach the CD mechani

31、sm assembly. XL-PM11/XM-PM11-5Remove the two screws A attaching the cabinet -door on the back of the body. Remove the two screws B on the cabinet -bottom.Remove the three screws C attaching the cabinet -middle and remove the cabinet -middle from the cabinet -bottom.ONE POINT: Disconnect the flexible

32、 board from connector FRW000 on the main board, and remove the cabinet -door with cabinet -middle.1.2.3.4.Disassembly methodRemoving the cabinet -door & cabinet -middle (See Fig.1 to 4)Flexible board is bonded with couple-face tapes internally in the cabinet - middle.Fig.1Fig.2 (The photograph is on

33、e of the B and E version. )Fig.3 (The photograph is one of the B and E version. )AABBCCCCabinet -doorCabinet -door (inside)Fig.4FRW000Main boardCabinet -middleCabinet -middleCabinet -middle (inside)Cabinet -bottomCabinet -bottomCabinet -bottom (inside)Flexible boardXL-PM11/XM-PM11-6Prior to performi

34、ng the following procedure, remove the cabinet -door, cabinet -middlet and CD mechanism.Remove the screw D attaching the EXT battery termial board, and remove the main board with the EXT battety terminal board. 1.Removing the main board & EXT battery terminal board (See Fig.6)Prior to performing the

35、 following procedure, remove the cabinet -door and cabinet -middle.Disconnect the harness(motor) from connector CON2(MOW000) on the main board .Disconnect the flexible board(pick-up) from connector CON1 on the main board and remove the CD mechanism.ONE POINT :1.2.Removing the CD mechanism (See Fig.5

36、)Solder the short-circuit land on the flexible board, before the flexible board is removed from connector OCN1 on the main board. When reassembling, unsolder the short-circuit land on the flexible board after connecting the flexible board.Flexible board is bonded with a couple-face tape on the botto

37、m cabinet.Prior to performing the following procedure, remove the cabinet -door and cabinet -middle.Remove the eight screws E attaching the metal cover (Peel off the warning label if necessary).Remove the metal cover and system control board.Disconnect the flexible board from connecter CON4 on the s

38、ystem control board.1.2.3.Removing the system control board (See Fig.7a and 7b)Flexible boardShort-circuitlandCON1(Note : See page 1-4)Fig.5Fig.6Fig.7aFig.7bDECON2(MOW000)CD mechanismMain boardCabinet -bottom(inside)Cabinet -bottom(inside)EXT battery terminal boardMain boardFlexible boardCON1Cabinet

39、 -door (inside)Cabinet -door (inside)Cabinet -door (inside)Metal coverSystem controlboard(Display board)CON4Flexible boardFlexible boardAttentionXL-PM11/XM-PM11-71. POWER / KEY2. PLAY1) EXT. DC SUPPLY (ADAPTOR)2) HOLD S/W in OFF POSITION.3) CD-DOOR Closed.REPLACE MICOM& MAIN PCBASSYPOWER OFF(STAND-B

40、Y)PLAYPRESSEDTOC READPLAYRE-ASSYRE-ASSYREPLACEXT701REPLACEIC6367& MAIN PCBASSYREPLACE ADAPTOR& MAIN PCBASSYREPLACEFRONT PCBASSYREPLACE LCD& FRONT PCBASSYLCD LIGHT?COMPLETEDISPLAY?CHECKCONNECTORCHECK VOLTAGEEMITTER of Q102 ;3.3V?CHECK OSC.of XT701 -3.58MHz?CHECK VOLTAGE PIN NO. 11,12,13,18,56 of MICO

41、M ;5V?CHECKVOLTAGE WAVEFORMPIN NO.25 of MICOMCHECK CONNECTOR-COMPLETE?YesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesNoNoNoNoNoNoNoNoNoNoNoNoNoNoNoNoNoNoNoTOC READ-PLAY?CHECK ALL KEYFUNCTIONCHECKASP(9226)CIRCUITCHECKVOLTAGE PIN No.24 of IC9226;DC LEVELCHECKVOLTAGE PIN No.1,2 of CON2;DC LEV

42、ELCHECKVOLTAGE PIN No.2,3 of CON10.5V 3VCHECKVOLTAGE CONNECTORPIN of Q3012V?CHECKVOLTAGE PIN No.4,5of CON2;DC LEVELCHECK DRIVE IC(6508)CIRCUITCHECK DRIVE IC 6508& REPLACEMAIN PCB ASSYREPLACECD-MECHAREPLACECD-MECHAREPLACECD-MECHAREPLACECD-MECHAMOVESLIDEINSIDE?PICK-UPLENS UP/DOWN?LASER LIGHT?DISCROTAT

43、E?CHECKASP(9226),DSP(9288) CIRCUIT& REPLACE MAINPCB ASSYCHECKASP(9226),DSP(6508) CIRCUIT& REPLACE MAINPCB ASSYCHECKASP(9226) CIRCUIT& REPLACE MAINPCB ASSYCHECKASP CIRCUITREPLACE MAINPCB ASSYCHECKVOLTAGE PINNo.32 of IC9226 AFTERPUSH PLAY(0.5V 3V)TroubleshootingXL-PM11/XM-PM11-8YesYesYesYesYesNoNoNoNo

44、3. AUDIO OUTPUT (LINE OUT, EARPHONE OUT)CHECKSIGNAL WAVEFORMPIN No. 33,38 of IC9288DURING PLAY STATE.;AUDIO SIGNAL?CHECKSIGNAL WAVEFORMPIN No. 1,2 ofEARPHONE JACK;AUDIO SIGNAL?REPALCEEARPHONE JACKREPALCELINE OUT JACKCHECKVOLTAGE PIN No. 58 of MICOM; 0V(LOW)CHECKVOLTAGE COLLECTORPIN of Q803; 0V(LOW)C

45、HECKSIGNAL WAVEFORM PIN No. 1,2 of LINEOUT JACK; AUDIO SIGNALREPLACE MICOM& MAIN PCB ASSYCHECK MUTECRCUIT & REPLACEMAIN PCB ASSYREPLACEMAIN PCB ASSYANALOG VR; MAXExplanation of MP3An audio compression format that is part of the MPEG-1 specification, which was standardized by the Moving Picture Exper

46、ts Group, a working group of ISO (International Organization for Standardization), in 1992. MPEG-1, which is used by VideoCDs, etc., refers to the international standard for audio/video compression technology and its format. The audio part of the standard is known as MPEG-1Audio (ISO/IEC 11172-3).MP

47、EG-1 Audio is an audio coding system that can efficiently compress sound by discarding frequencies below the range of human hearing(1), as well as sound which is masked(2). MPEG-1Audio is divided into three layers: Layer 1, Layer 2 and Layer 3. The higher the Layer number, the higher the compression

48、 rate and the better the sound quality.32 kHz, 44.1 kHz and 48 kHz sampling rates are supported. Monaural and 2-channel stereo can be compressed to 32-448 kbps with Layer 1, 32-384 kbps with Layer 2 and 32-320kbps with Layer 3. The following is a summary of each Layer:MP3 (MPEG-1 Audio Layer 3)Layer

49、 3To create efficiently compressed audio data that is perceptually the same as the original, the following modes have been added to Layer 2.MDCT (Modified Diskrete Cosine Transform) for subdivision of bandwidth.Huffman coding that assigns the short bit to the data that frequently appears, and the lo

50、ng bit to the data that does not appear much.MS (Middle/Side) stereo coding(3) that divides the stereo signal into the sum signal (L+R) and the difference signal (L-R).(1) The human ear cannot detect sound above or below 3 kHz in the silent situation. (2) Auditory masking is the phenomenon where low