sony_mdsjb920_service 维修电路图.pdf

MICROFILM SERVICE MANUAL MINI DISC DECK US Model Canadian Model AEP Model UK Model SPECIFICATIONS MDS-JB920 Model Name Using Similar MechanismMDS-JE520 MD Mechanism TypeMDM-5A Optical Pick-up TypeKMS-260A/J1N SystemMiniDisc digital audio system DiscMiniDisc LaserSemiconductor laser (=780nm) Emission duration: continuous Laser outputLess than 44.6 W* * 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 diode propertiesMaterial: GaAIAs Revolutions (CLV)400 rpm to 900 rpm Error correctionAdvanced Cross Interleave Reed Solomon Code (A CIRC) Sampling frequency44.1 kHz CodingAdaptive Transform Acoustic Coding (ATRAC) Modulation systemEFM (English-to-Fourteen Modulation) Number fo channels2 setero channels Frequency response5 to 20,000 Hz 0.3 dB Signal-to-noise retioOver 100 dB during playback Wow and flutterBelow measureble limit U.S. and foreign patents licensed form Dolby Laboratories Licensing Corporation. Inputs jackinputRatedMinimum typeimpedanceinputinput LINE (ANALOG) phono47 kilohms500 mVrms 125 mVrms INjacks DIGITALSquareOptical wave OPTICAL IN1opticallength: connector660 nm jack DIGITALSquareOptical wave OPTICAL IN2opticallength: connector660 nm jack DIGITALPhono75 ohms0.5 Vp-p COAXIAL INjack20% Outputs jack typeRated outputLoad impedance PHONESStereo28 mW32 ohms phone jack LINE (ANALOG) Phono2 VrmsOver OUTjacks(at 50 kilohms)10 kilohms DIGIRALSquare18 dBmOptical wave OPTICAL OUTopticallength: connector660 nm jack DIGITALPhono0.5 Vp-p75 ohms COAXIAL OUTjack(at 75 ohms) 收音机爱好者资料库 Ra d i o Fa n s .CN 2 General Power requirements Where purchasedPower requirements Continental Europe and UK220 230 V AC, 50/60 Hz U.S.A and Canada120 V AC, 60 Hz Power consumption18 W Dimensions (approx.) (w/h/d) incl.projecting parts and controls 430 107.5 287 mm (17 41/4 113/8 in) Mass (approx.)4.8 kg (10 lb 9 oz) Supplied accessories Audio connecting cords (2) Optical cable (1) Remote commander (remote) RM-D17M (1) R6 (size-AA) batteries (2) Design and specifications are subject to change without notice. SELF-DIAGNOSIS 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 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)”. Procedure for using the Self-Diagnosis Function (Error History 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 pressing the AMS knob and p button, connect the power plug to the outlet, and release the AMS knob and p button. 2.Rotate the AMS knob and when “Service” is displayed, press the YES button. 3.Rotate the AMS knob and display “ERR DP MODE”. 4.Pressing the YES button sets the error history mode and displays “total rec”. 5.Select the contents to be displayed or executed using the AMS knob. 6.Pressing the AMS knob will display or execute the contents selected. 7.Pressing the AMS knob another time returns to step 4. 8.Pressing the MENU/NO button displays “ERROR DP MODE” and exits the error history mode. 9.To exit the test mode, press the REPEAT button. The unit sets into the STANDBY state, the disc is ejected, and the test mode ends. 收音机爱好者资料库 Ra d i o Fa n s .CN 3 Items of Error History Mode Items and Contents Selecting the Test Mode DisplayDetails of History E00No error E01Disc error. PTOC cannot be read (DISC ejected) E02Disc error. UTOC error (DISC not ejected) E03Loading error E04Address cannot be read (Servo has deviated) Table of Error Codes Error CodeError CodeDetails of Error total recDisplays the recording time. Displayed as “rh”. The displayed time is the total time the laser is set to the high power state. This is about 1/4 of the actual recording time. The time is displayed in decimal digits from 0h to 65535h. total playDisplays the play time. Displayed as “ph”. The time displayed is the total actual play time. Pauses are not counted. The time is displayed in decimal digits from 0h to 65535h. retry errDisplays the total number of retries during recording and number of retry errors during play. Displayed as “r p”. “r” indicates the retries during recording while “p” indicates the retry errors during play. The number of retries and retry errors are displayed in hexadecimal digits from 00 to FF. total errDisplays the total number of errors. Displayed as “total ”. The number of errors is displayed in hexadecimal digits from 00 to FF. err historyDisplays the 10 latest errors. Displayed as “0 E”. indicates the history number. The smaller the number, the more recent is the error. (00 is the latest). indicates the error code. Refer to the following table for the details. The error history can be switched by rotating the AMS knob. er refreshMode which erases the “retry err”, “total err”, and “err history” histories. When returning the unit to the customer after completing repairs, perform this to erase the past error history. After pressing the AMS button and “er refresh?” is displayed, press the YES button to erase the history. “Complete!” will be displayed momentarily. Be sure to check the following when this mode has been executed. The data has been erased. The mechanism operates normally when recording and play are performed. tm refreshMode which erases the “total rec” and “total play” histories. These histories serve as approximate indications of when to replace the optical pickup. If the optical pickup has been replaced, perform this operation and erase the history. After pressing the AMS button and “tm refresh?” is displayed, press the YES button to erase the history. “Complete!” will be displayed momentarily. Be sure to check the following when this mode has been executed. The data has been erased. The mechanism operates normally when recording and play are performed. E05FOK has deviated E06Cannot focus (Servo has deviated) E07Recording retry E08Recording retry error E09Playback retry error (Access error) E0APlayback retry error (C2 error) Details of Error 收音机爱好者资料库 Ra d i o Fa n s .CN 4 SECTION 1 SERVICING NOTES SAFETY CHECK-OUT After correcting the original service problem, perform the follow- ing safety check 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 TEST The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microampers.). 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 instruments. 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” indica- tion is 0.75 V, so analog meters must have an accurate low- voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex- amples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2 V AC range are suit- able. (See Fig. A) Fig. A.Using an AC voltmeter to check AC leakage. 1.5 k0.15 F AC voltmeter (0.75 V) To Exposed Metal Parts on Set Earth Ground MODEL IDENTIFICATION BACK PANEL Part No. 4-998-603-1 AEP and UK models 4-998-603-3 US model 4-998-603-4 Canadian model TABLE OF CONTENTS 1.SERVICING NOTES.4 2.GENERAL. 11 3.DISASSEMBLY. 14 4.TEST MODE. 18 5.ELECTRICAL ADJUSTMENTS. 23 6.DIAGRAMS 6-1.IC Pin Function Description . 32 6-2.Block Diagram SERVO Section . 41 6-3.Block Diagram MAIN Section . 43 6-4.Note for Printed Wiring Boards and Schematic Diagrams . 46 6-5.Printed Wiring Board BD Section . 47 6-6.Schematic Diagram BD Section (1/2) . 49 6-7.Schematic Diagram BD Section (2/2) . 51 6-8.Schematic Diagram MAIN Section (1/3). 55 6-9.Schematic Diagram MAIN Section (2/3). 57 6-10. Schematic Diagram MAIN Section (3/3). 59 6-11. Printed Wiring Board MAIN Board (Side A). 61 6-12. Printed Wiring Boards MAIN Board (Side B), AC/BAT Boards . 63 6-13. Printed Wiring Boards PANEL Section . 65 6-14. Schematic Diagram PANEL Section . 67 6-15. Schematic Diagram BD SWITCH Section . 69 6-16. Printed Wiring Board BD SWITCH Section . 69 7.EXPLODED VIEWS. 75 8.ELECTRICAL PARTS LIST. 79 5 Flexible Circuit Board Repairing Keep the temperature of the soldering iron around 270 C dur- ing 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 soldering or unsoldering. Notes on chip component replacement Never reuse a disconnected chip component. Notice that the minus side of a tantalum capacitor may be dam- aged by heat. 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 batterityp 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. 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 by the manufacturer. Discard used batteries according to the manufacturers instruc- tions. CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous ra- diation exposure. Laser component in this product is capable of emitting radia- tion exceeding the limit for Class 1. This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PROD- UCT MARKING is located on the rear exterior. This caution label is located inside the unit. ATTENTION AU COMPOSANT AYANT RAPPORT LA SCURIT! LES COMPOSANTS IDENTIFIS PAR UNE MARQUE ! SUR LES DIAGRAMMES SCHMATIQUES ET LA LISTE DES PICES SONT CRITIQUES POUR LA SCURIT DE FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS QUE PAR DES PICES SONY DONT LES NUMROS SONT DONNS DANS CE MANUEL OU DANS LES SUPPLMENTS PUBLIS PAR SONY. SAFETY-RELATED COMPONENT WARNING! COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! 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 THIS MANUAL OR IN SUPPLEMENTS PUB- LISHED BY SONY. 6 JIG FOR CHECKING BD BOARD WAVEFORM The special jig (J-2501-149-A) is useful for checking the waveform of the BD board. The names of terminals and the checking items to be performed are shown as follows. GND: Ground I+3V : For measuring IOP (Check the deterioration of the optical pick-up laser) IOP : For measuring IOP (Check the deterioration of the optical pick-up laser) TE: TRK error signal (Traverse adjustment) VC: Reference level for checking the signal RF: RF signal (Check jitter) CN110 RF 5P Connector 6P connector VCTEO IOP I+3V GND Mechanism deck RF VC TEOMDM-3 MDM-5 IOP I-3V VC RF TEO IOP I+3V GND VC RF TEO IOP I+3V GND 1 5 1 6 7 IOP Data Recording and Display When Pickup and Non-volatile Memory (IC171 of BD board) are Replaced The IOP value labeled on the pick-up can be recorded in the non-volatile memory. By recording the value, it will eliminate the need to look at the value on the label of the optical pick-up. When replacing the pick-up or non-volatile memory (IC171 of BD board), record the IOP value on the pick-up according to the following procedure. Record Precedure: 1.While pressing the AMS knob and p button, connect the power plug to the outlet, and release the AMS knob and p button. 2.Rotate the AMS knob to display “Service”, and press the YES button. 3.Rotate the AMS knob to display “lop.Write” (C28), and press the YES button. 4.The display becomes “Ref=.” ( is an arbitrary number) and the numbers which can be changed will blink. 5.Input the IOP value written on the optical pick-up. To select the number: Rotate the AMS knob. To select the digit: Press the AMS knob. 6.When the YES button is pressed, the display becomes “Measu=.” ( is an arbitrary number). 7.As the adjustment results are recorded for the 6 value. Leave it as it is and press the YES button. 8.“Complete!” will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become “Iop Write”. 9.Press the REPEAT button to complete. “Standby” will be displayed. Display Precedure: 1.While pressing the AMS knob and p button, connect the power plug to the outlet, and release the AMS knob and p button. 2.Rotate the AMS knob to display “Service”, and press the YES button. 3.Rotate the AMS knob to display “lop.Read” (C27). 4.“./#.#” is displayed and the recorded contents are displayed. .: indicates the Iop value labeled on the pick-up. #.#: indicates the Iop value after adjustment 5.To end, press the AMS button or MENU/NO button to display “Iop Read”. Then press the REPEAT button to display “Standby”. 8 Checks Prior to Parts Replacement and Adjustments Before performing repairs, perform the following checks to determine t