sony_MDS-JB940_service_manual 维修电路图.pdf

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1、MDS-JB940 US Model Canadian Model AEP Model UK Model SERVICE MANUAL MINIDISC DECK Model Name Using Similar MechanismNEW MD Mechanism TypeMDM-7A Optical Pick-up NameKMS-260B/J1N U.S and foreign patents licensed from Dolby Laboratories Licensing Corporation. SPECIFICATIONS Inputs Outputs SystemMiniDis

2、c digital audio system DiscMiniDisc LaserSemiconductor laser ( = 780 nm) Emission duration: continuous Laser outputMAX 44.6 W1) 1) This output is the value measured at a distance of 200 mm from the objective lens surface on the Optical Pick-up Block with 7 mm aperture. Laser diodeMaterial: GaAlAs Re

3、volutions (CLV)400 rpm to 900 rpm Error correctionACIRC (Advanced Cross Interleave Reed Solomon Code) Sampling frequency44.1 kHz CodingATRAC (Adaptive TRansform Acoustic Coding)/ATRAC 3 Modulation systemEFM (Eight-to-Fourteen Modulation) Number of channels2 stereo channels Frequency response5 to 20,

4、000 Hz 0.3 dB Signal-to-noise ratioOver 100 dB during play Wow and flutterBelow measurable limit ANALOG INJack type: phono Impedance: 47 kilohms Rated input: 500 mVrms Minimum input: 125 mVrms DIGITAL OPTICAL IN1Connector type: square optical Impedance: 660 nm (optical wave length) DIGITAL OPTICAL I

5、N2Connector type: square optical Impedance: 660 nm (optical wave length) DIGITAL COAXIAL INJack type: phono Impedance: 75 ohms Rated input: 0.5 Vp-p, 20 % PHONESJack type: stereo phone Rated output: 28 mW Load impedance: 32 ohms ANALOG OUTJack type: phono Rated output: 2 Vrms (at 50 kilohms) Load im

6、pedance: over 10 kilohms DIGITAL OPTICAL OUT Connector type: square optical Rated output: 18 dBm Load impedance: 660 nm (optical wave length) DIGITAL COAXIAL OUT Jack type: phono Rated output: 0.5 Vp-p (at 75 ohms) Load impedance: 75 ohms General Power requirements Supplied accessories US and foreig

7、n patents licensed from Dolby Laboratories. Design and specifications are subject to change without notice. Where purchasedPower requirements U.S.A. and Canada120 V AC, 60 Hz Europe230 V AC, 50/60 Hz Power consumption18 W Dimensions (approx.)430 111 286 mm (17 43/8 113/8 in.) (w/h/d) incl. projectin

8、g parts and controls Mass (approx.)5.3 kg (11 lbs 11 oz) This MD deck comes with the following items: Audio connecting cords (2) Optical cable (1) Remote commander (remote) (1) R6 (size-AA) batteries (2) 收音机爱好者资料库 Ra d i o Fa n s .CN 2 After correcting the original service problem, perform the follo

9、wing safety checks before releasing the set to the customer: Check the antenna terminals, metal trim, “metallized” knobs, screws, and all other exposed metal parts for AC leakage. Check leakage as described below. LEAKAGE The AC leakage from any exposed metal part to earth ground and from all expose

10、d metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microamperes). Leakage current can be measured by any one of three methods. 1.A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers instructions to use these instru

11、ments. 2.A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job. 3.Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC voltmeter. The “limit” indication is 0.75 V, so analog meters must have an accurate low-voltage sca

12、le. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A) SAFETY CHECK-OUT To Exposed Metal Parts on Set 0.15 F 1.5 k AC Voltmeter (0.75 V) Earth Ground Fig. A. Using an AC

13、 voltmeter to check AC leakage. TABLE OF CONTENTS MODEL IDENTIFICATION BACK PANEL Model AEP, UK models Canadian model US model Part No. 4-228-507-0s 4-228-507-1s 4-228-507-2s Part No. SELF-DIAGNOSIS FUNCTION 4 1. SERVICE NOTE6 2. GENERAL 11 3. DISASSEMBLY 14 4. TEST MODE 17 5. ELECTRICAL ADJUSTMENTS

14、 22 6. DIAGRAMS 6-1. Block Diagram MAIN Section 31 6-2. Block Diagram DISPLAY/POWER Section 32 6-3. Note for Printed Wiring Boards and Schematic Diagrams 33 6-4. Circuit Board Location 33 6-5. Waveforms 34 6-6. Printed Wiring Board BD Board 35 6-7. Schematic Diagram BD Board (1/2) 36 6-8. Schematic

15、Diagram BD Board (2/2) 37 6-9. Printed Wiring Board HP Board/KEY Board 38 6-10.Schematic Diagram HP Board/KEY Board 38 6-11.Schematic Diagram MAIN Board (1/3) 39 6-12.Schematic Diagram MAIN Board (2/3) 40 6-13.Schematic Diagram MAIN Board (3/3) 41 6-14.Printed Wiring Board MAIN Board (Side A) 42 6-1

16、5.Printed Wiring Board MAIN Board (Side B) 43 6-16.Printed Wiring Board PANEL Section 44 6-17.Schematic Diagram PANEL Section 45 6-18.Schematic Diagram AC Board 46 6-19.Printed Wiring Board AC Board 47 6-20.IC Block Diagrams 48 6-21.IC Pin Function Description 53 7. EXPLODED VIEWS 60 8. ELECTRICAL P

17、ARTS LIST 64 收音机爱好者资料库 Ra d i o Fa n s .CN 3 SAFETY-RELATED COMPONENT WARNING! COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THI

18、S MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY. ATTENTION AU COMPOSANT AYANT RAPPORT LA SCURIT! LES COMPOSANTS IDENTIFS PAR UNE MARQUE 0 SUR LES DIAGRAMMES SCHMATIQUES ET LA LISTE DES PICES SONT CRITIQUES POUR LA SCURIT DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PISES SONY DONT LES NUM

19、ROS SONT DONNS DANS CE MANUEL OU DANS LES SUPPMENTS PUBLIS PAR SONY. This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the rear exterior. The following caution label is located inside the unit. Laser component in this product is capable of emitt

20、ing radiation exceeding the limit for Class 1. CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. Notes on chip component replacement Never reuse a disconnected chip component. Notice that the minus side o

21、f a tantalum capacitor may be damaged by heat. Flexible Circuit Board Repairing Keep the temperature of soldering iron around 270C during repairing. Do not touch the soldering iron on the same conductor of the circuit board (within 3 times). Be careful not to apply force on the conductor when solder

22、ing or unsoldering. ADVARSEL Eksplosjonsfare ved feilaktig skifte av batteri. Benytt samme batteritype eller en tilsvarende type anbefalt av apparatfabrikanten. Brukte batterier kasseres i henhold til fabrikantens instruksjoner. VARNING Explosionsfara vid felaktigt batteribyte. Anvnd samma batterity

23、p eller en likvrdig typ som rekommenderas av apparattillverkaren. Kassera anvnt batteri enligt gllande freskrifter. VAROITUS Paristo voi rjht, jos se on virheellisesti asennettu. Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin. Hvit kytetty paristo valmistajan ohjeiden mukaisesti.

24、 ADVARSEL! Lithiumbatteri-Eksplosionsfare ved fejlagtig hndtering. Udskiftning m kun ske med batteri af samme fabrikat og type. Levr det brugte batteri tilbage til leverandren. CAUTION Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended b

25、y the manufacturer. Discard used batteries according to the manufacturers instructions. The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair

26、, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled with care. NOTES ON LASER DIODE EMISSION CHECK The laser beam on this model is concentrated so as to be focus

27、ed on the disc reflective surface by the objective lens in the optical pick- up block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens. NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT 收音机爱好者资料库 Ra d i o Fa n s .CN 4 SELF-DIAGNOSIS

28、 FUNCTION The self-diagnosis function consists of error codes for customers which are displayed automatically when errors occur, and error codes which show the error history in the test mode during servicing. For details on how to view error codes for the customer, refer to the following box in the

29、instruction manual. For details on how to check error codes during servicing, refer to the following “Procedure for using the Self- Diagnosis Function (Error History Display Mode)”. The decks self-diagnosis function automatically checks the condition of the MD deck when an error occurs, then issues

30、a three- or five-digit code and an error message on the display. If the code and message alternate, find them in the following table and perform the indicated countermeasure. Should the problem persist, consult your nearest Sony dealer. PROCEDURE FOR USING THE SELF-DIAGNOSIS FUNCTION (ERROR HISTORY

31、DISPLAY MODE) Note:Perform the self-diagnosis function in the “error history display mode” in the test mode. The following describes the least required procedure. Be careful not to enter other modes by mistake. If you set other modes accidentally, press the MENU/NO button to exit the mode. 1.While p

32、ressing the l AMS L knob and x button, connect the power plug to the outlet, and release the l AMS L knob and x button. When the test mode is set “Check” is displayed. 2.Turn the l AMS L knob and when “Service” is displayed, press the YES button. 3.Turn the l AMS L knob to display “Err Display”. 4.P

33、ress the YES button to sets the error history mode and displays “op rec tm”. 5.Select the contents to be displayed or executed using the l AMS L knob. 6.Press the l AMS L knob to display or execute the contents selected. 7.Press the l AMS L knob another time to return to step 4. 8.Press the MENU/NO

34、button to display “Err Display” and release the error history mode. 9.To release the test mode, press the REPEAT button. The unit sets into the STANDBY state and the test mode ends. Three- or five- digit code/ Message Cause/Remedy C11/Protected The inserted MD is record-protected. Take out the MD an

35、d close the record- protect slot (page 15). C12/Cannot Copy You tried to record a CD with a format that the external device connected to the deck does not support, such as CD-ROM or video CD. Remove the disc and insert a music CD. C13/REC Error The recording was not made properly. Set the deck in a

36、stable surface, and repeat the recording procedure. The inserted MD is dirty (with smudges, fingerprints, etc.), scratched, or substandard in quality. Replace the disc and repeat the recording procedure. C13/Read Error The deck could not read the TOC on the MD properly. Take out the MD and insert it

37、 again. C14/Toc Error The deck could not read the TOC on the MD properly. Insert another disc. If possible, erase all the tracks on the MD (page 32). C41/Cannot Copy The sound source is a copy of commercially available music software, or you tried to record a CD-R (Recordable CD). The Serial Copy Ma

38、nagement System prevents making a digital copy (page 52). You cannot record a CD-R. C71/Din Unlock The sporadic appearance of this message is caused by the digital signal being recorded. This will not affect the recording. While recording from a digital component connected through the DIGITAL IN con

39、nector, the digital connecting cable was unplugged or the digital component turned off. Connect the cable or turn the digital component back on. E0001/ MEMORY NG There is an error in the internal data that the deck needs in order to operate. Consult your nearest Sony dealer. E0101/ LASER NG There is

40、 a problem with the optical pickup. The optical pickup may have failed. Consult your nearest Sony dealer. Three- or five- digit code/ Message Cause/Remedy 5 ITEMS OF ERROR HISTORY MODE ITEMS AND CONTENTS Details of History Displays the total recording time. When the total recording time is one minut

41、e or longer, displays the time and minute. When the total recording time is less than one minute, displays “Under 1 min”. The displayed time is about 1/4 of the actual recording time when the laser is set to the high power state. Displays the total playback time. When the total playback time is one

42、minute or longer, displays the time and minute. When the total playback time is less than one minute, displays “Under 1 min”. Displays the total time when the spindle motor rotates. When the total rotation time is one minute or longer, displays the time and minute. When the total rotation time is le

43、ss than one minute, displays “Under 1 min”. Displays the total number of retries during recording and number of retry errors during playback. Displayed as “r xx p yy”. “xx” indicates the number of retries during recording, “yy” indicates the number of retry errors during playback. The numbers are di

44、splayed in hexadecimal from 00 to FF. Displays the total number of errors. Displayed as “total xx”. The number is displayed in hexadecimal from 00 to FF. Displays the last ten errors. Displayed as “0 x ErrCd”. “x” indicates the history number. A smaller number indicates a more recent error (00 is th

45、e latest). indicates the error code. The error history number is selected by turning the l AMS L knob. Displays the last five retry addresses. Displayed as “xx ADRS yyyy”. “xx” indicates the history number. “yyyy” indicates the cluster where the retry occurred. The history number is selected by turn

46、ing the l AMS L knob. Mode which erases the error history and the retry address history Operation procedure 1 When “er refresh” is displayed, press the l AMS L knob. 2 After the display changes to “er refresh?”, press the YES button. The “Complete!” message indicates that the operation has ended. Af

47、ter executing this mode, be sure to check the following: The data has been erased. The mechanism runs normally when recording and playback are performed. Mode which erases the total time of “op rec tm” and “op play tm” These histories are used as a guideline for the time to replace the optical pick-

48、up. After replacing the optical pick-up, perform this operation to erase the history. Operation procedure 1 When “op change” is displayed, press the l AMS L knob. 2 After the display changes to “op change?”, press the YES button. The “Complete!” message indicates that the operation has ended. Mode w

49、hich erases the total time of “spdl rp tm” The history is used as a guideline for the time to replace the spindle motor. After replacing the spindle motor, perform this operation to erase the history. Operation procedure 1 When “spdl change” is displayed, press the l AMS L knob. 2 After the display changes to “spdl change?”, press the YES button. The “Complete!” message indicates that the operation has ended. Table of Error Codes Display op rec tm op play tm spdl rp tm retry err total err err history retry adrs er refresh