Mitsubishi-DD8020-dvd-sm 电路图 维修手册.pdf

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1、MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC. 9351 Jeronimo Rd. Irvine, CA 92618 Copyright 2002 Mitsubishi Digital Electronics America, Inc. All Rights Reserved Operating conditions:Temperature: 5C to 35C Operation status:Horizontal Video output:1.0 V (p-p), 75, negative sync., pin jack x 1 S Video o

2、utput:(Y) 1.0 V (p-p), 75, nega- tive sync., Mini DIN 4-pin x 1 (C) 0.286 V (p-p), 75 Color Difference outputs: (Y) 1.0 V (p-p), 75, (1 Interlaced)negative sync., pin jack x 1 (1 Progressive)(Cr, Pr)/(Cb, Pb) 0.7 V (p-p), 75, pin jack x 2 Digital Audio output:(Bitstream/PCM) 0.5 V (p-p), 75, pin jac

3、k x 1, Optical connector x 1 Analog Audio output:2.0 V (rms), 220, pin jack 2 CH L R x 2, 5.1 CH SURROUND x 6 CAUTION Before servicing this chassis, it is important that the service person reads all SAFETY PRECAUTIONS and the SAFETY NOTICE in this manual. SPECIFICATIONS Power Supply:120V AC, 60 Hz P

4、ower Consumption:17W Weight:6.6 lb. External Dimensions:17x 3-3/8x12-1/8 (W/H/D) Signal System:Standard NTSC Laser:Semiconductor laser, wavelength 650nm/780nm Frequency Range:(Digital Audio) DVD Linear - 48 kHZ Sampling: 4 Hz to 22 kHz 96 kHZ Sampling:4 Hz to 44 kHz Signal-To-Noise Ratio:More than 1

5、12 dB (EIAJ) Audio Dynamic Range:More than 108 dB (EIAJ) Harmonic Distortion:Less than 0.002% Wow and flutter:Below measurable level (less than 0.001% (W.PEAK) (EIAJ) SerSerSerSerServicevicevicevicevice ManualManualManualManualManual 2002 MITSUBISH ELECTRIC Model DD-8020 DVD Player OPEN/CLOSE STOPPL

6、AYPAUSE/STEP POWER DVD AUDIO/VIDEO PLAYER DD-8020 STANDBY SKIP REVFWD / / CDVD TITLETRK CHPTOTAL REMAINMEMORY HDCD PROGRESSIVE AUDIO RadioFans.CN 收音机爱 好者资料库 - RadioFans.CN 收音机爱 好者资料库 SAFETY NOTICE SAFETY PRECAUTIONS LEAKAGE CURRENT CHECK Plug the AC line cord directly into a 120V AC outlet (do not u

7、se an isolation transformer for this check). Use an AC voltmeter, having 5000 per volt or more sensitivity. Connect a 1500 10 W resistor, paralleled by a 0.15 F 150V AC capacitor between a known good earth ground (water pipe, conduit, etc.) and all exposed metal parts of cabinet (antennas, handle br

8、acket, metal cabinet screwheads, metal overlays, control shafts, etc.). Measure the AC voltage across the 1500 resistor. The test must be conducted with the AC switch on and then repeated with the AC switch off. The AC voltage indicated by the meter may not exceed 0.3 V. A reading exceeding 0.3 V in

9、dicates that a dangerous potential exists, the fault must be located and corrected. Repeat the above test with the DVD VIDEO PLAYER power plug reversed. NEVER RETURN A DVD VIDEO PLAYER TO THE CUSTOMER WITHOUT TAKING NECESSARY CORRECTIVE ACTION. READING SHOULD NOT EXCEED 0.3V DVD VIDEO PLAYER AC VOLT

10、METER (5000 ? per volt or more sensitivity) Good earth ground such as a water pipe, conduit, etc.1500 ? 10 W 0.15 F 150V AC AC OUTLET Test all exposed metal. Voltmeter Hook-up for Leakage Current Check RadioFans.CN 收音机爱 好者资料库 LASER BEAM CAUTION LABEL When the power supply is turned on, you may not r

11、emove this laser caution label. If it is removed, laser radiation may be recceived. The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the products enclosure that may be of sufficient magn

12、itude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance. SAFETY NOTICE SECTION 2 PART REPLA

13、CEMENT AND ADJUSTMENT PROCEDURES SECTION 3 SERVICING DIAGRAMS 1. STANDING PC BOARDS FOR SERVICING . 3-1 2. CIRCUIT SYMBOLS AND SUPPLEMENTARY EXPLANATION. 3-2 2-1. Precautions for Part Replacement . 3-2 2-2. Solid Resistor Indication .3-2 2-3. Capacitance Indication. 3-2 2-4. Inductor Indication . 3-

14、3 2-5. Waveform and Voltage Measurement. 3-3 3. PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM. 3-5 4. BLOCK DIAGRAMS.3-7 4-1. Overall Block Diagram . 3-7 4-2. Power Supply Block Diagram . 3-9 4-3. Front Display, Power Switch Block Diagram .3-10 4-4. Main Block Diagrams . 3-13 4-5. Output Block Diagram

15、. 3-17 5. CIRCUIT DIAGRAMS. 3-19 5-1. Power Supply Circuit Diagram. 3-19 5-2. Front Display, Power Switch Circuit Diagram. 3-21 5-3. Main Circuit Diagram . 3-24 5-4. Output Circuit Diagram. 3-29 5-5. Motor System Circuit Diagrams. 3-34 6. PC BOARDS . 3-35 6-1. Power Supply PC Board. 3-35 6-2. Main P

16、C Board . 3-37 6-3. Output PC Board. 3-47 CONTENTS SECTION 1 GENERAL DESCRIPTIONS 1. PREPARATION FOR SERVICING . 1-1 2. LOCATION OF MAIN PARTS AND MECHANISM PARTS . 1-2 2-1. Location of Main Parts.1-2 2-2. Location of Mechanism Parts . 1-3 1. REPLACEMENT OF MECHANICAL PARTS . 2-1 1-1. Cabinet Replac

17、ement . 2-1 1-1-1. Top Cover . 2-1 1-1-2. Clamper Stay . 2-1 1-1-3. Tray Panel . 2-2 1-1-4. Front Panel and Tray . 2-3 1-1-5. Rear Panel . 2-3 1-2. PC Board Replacement . 2-4 1-2-1. Main PC Board . 2-4 1-2-2. Output PC Board . 2-4 1-2-3. Power PC board . 2-5 1-2-4. Front PC Board . 2-5 1-3. Mechanis

18、m Parts. 2-6 1-3-1. Mechanism Chassis Assembly . 2-6 1-3-2. Loading Belt . 2-6 1-3-3. Loading Motor . 2-7 1-3-4. Sub Chassis (with a pickup mechanism) . 2-7 1-3-5. Pickup Mechanism Assembly . 2-8 1-3-6. Gear A Assembly, Gear B and Rack Gear Assembly .2-8 1-3-7. Feed Motor . 2-9 3. TROUBLESHOOTING. 1

19、-7 3-1. Main Circuit. 1-7 3-1-1. Servo System . 1-7 3-1-2. Location Diagram of Servo Test Point . 1-14 SECTION 4 PARTS LIST SAFETY PRECAUTION . 4-1 NOTICE . 4-1 ABBREVIATIONS . 4-1 1. Integrated Circuit (IC) . 4-1 2. Capacitor (Cap) . 4-1 3. Resistor (Res). 4-1 4. EXPLODED VIEWS . 4-2 4-1. Packing A

20、ssembly . 4-2 4-2. Chassis Assembly. 4-3 4-3. Mechanism Assembly. 4-4 5. PARTS LIST. 4-6 - SECTION 1 GENERAL DESCRIPTIONS SECTION 1 GENERAL DESCRIPTIONS 1M Ground conductive wrist strap for body. Soldering iron with ground wire or ceramic type Conductive mat The ground resistance between the ground

21、line and the ground is less than 10. The Pickup Head consists of a laser diode that is very susceptible to external static electricity. Although it may operate properly after replacement, if subjected to electrostatic discharge during replacement, its life might be shortened. When replacing the lase

22、r diode, LSIs and ICs, use a conductive mat, soldering iron with ground wire, etc. to protect against damage from static electricity. 1. PREPARATION FOR SERVICING GENERAL DESCRIPTIONS 1-1 2. LOCATION OF MAIN PARTS AND MECHANISM PARTS 2-1. Location of Main Parts Fig. 1-2-1 EU05 Output PC board Feed m

23、otor PC board EU03 Front display PC boardLoading motor PC board Disc motor PC board EU04 Power SW PC board EU01 Main PC board EU02 Power supply PC board 1-2 2-2. Location of Mechanism Parts Fig. 1-2-2 Mechanism chassis assembly (Top side) Fig. 1-2-3 Mechanism chassis assembly (Bottom side) Tray Clam

24、per stay Loading motor PC board Mechanism chassis 1-3 Fig. 1-2-4 Mechanism chassis assembly (Internal side) Loading belt Loading motor Kick lever Cam Slider Gear Gear Gear Disc motor 1-4 Fig. 1-2-5 Pickup mechanism chassis assembly (Top side) Fig. 1-2-6 Pickup mechanism chassis assembly (Bottom side

25、) Front damper Rack gear assembly Gear A Gear B assembly Front damper Sub chassis Rear damper Pickup assembly Rear damper Feed motor Feed motor PC board Note: When servicing, note that this model has two types of pickup mechanism assembly. Type A is a service part. Type B can be replaced with a Type

26、 A pickup. 1-5 Fig. 1-2-7 Pickup mechanism chassis assembly (Top side) Fig. 1-2-8 Pickup mechanism chassis assembly (Bottom side) Front damper Rack gear assembly Gear A Gear B assembly Front damper Sub chassis Rear damper Pickup assembly Rear damper Feed motor Feed motor PC board 1-6 3. TROUBLESHOOT

27、ING 3-1. Main Circuit 3-1-1. Servo System (1) Initial Operation after Power ON Power ON Send each LSI hard RST command and initial command. Pickup head is positioned at transmission initial position. Is tray closed? Pin 5 of CN502, TCLS=L Disc presence/absence and disc judgement Is a disc present? D

28、VD or CD initial setting. DVD single Initial setting. DVD dual Initial setting. CD Initial setting. To each disc playback process. DVD single (single-layer) DVD single (single-layer)/DVD dual (dual-layer)/CD? CD DVD dual (dual-layer) 1 Tray close operation Pin C9 of IC306 (E537): LDMP = H/L Pin Y19

29、of IC306 (E538): LDMN = L Is tray closed? Pin 5 of CN502: TCLS = L Y N Tray stops. Pin C9 of IC306 : LDMP = H Pin Y19 of IC306 : LDMN = L Laser OFF Display: INSERT DISC Monitor screen: NO DISC Y Y NG N N 2 Fig. 1-3-1 1-7 Pickup (P.U.) transmission initial operation does not occur. The pickup transmi

30、ssion initial operation is carried out to determine the initial position by transmitting the pickup to the innermost position once (start-limit switch (pin 4 of CN503) develops L.) and to the external direction at low speed (start-limit switch develops H, turning off the switch.). 1 Does pulse of 1.

31、65V 1.65V develop at pin 162 of IC401? Check BUS between IC401-IC306 and oscillation. Check feed gear. N Y 2-1 No disc misjudgement display of disc presence. Does lens move with UP/DOWN full stroke in focus direction? Is laser current normal? Check IC401. Does search signal output at both edges of f

32、ocus coil? (Pins 15 to 18 of CN501) Does focus search voltage of 1.65V 0.4V develop at pin 23 of IC503 (E544)? Check pickup head and wiring. Does RFSB signal develop more than 0.3V? Check IC502. Lens cleaning. Replace pickup head. Check peripheral circuit of IC306. Check IC503. Y Y Y Y 3 N N N Y N N

33、 Fig. 1-3-2 Fig. 1-3-3 1-8 Disc kind misjudgement (Initial setting is NG.) Replace pickup head. Lens cleaning. Check IC502. Are FE and RFSB signals for each disc normal? Check peripheral circuit of IC306. 2-2 Y N Check laser operating current. Check laser current. I min lop I max Check pins 13, 14 a

34、nd 15 of IC502 serial bus. Check peripheral circuits of IC502, Q501, Q502. Check solder removal of the short land for laser diode protection. Check FE and RFSB signal lop I maxlop I min 3 Check wiring for pickup head. Replace pickup mechanism. Y Y N lop 200 mA Laser operating current DVD Iop DVD Iop

35、 = Voltage between (E559 and E534) /10? CD Iop = Voltage between (E536 and E534) /10? CD Iop min 20mA 20mA 35mA 45mA 60mA 80mA typmax CAUTION The laser ray emitting out from the pickup head is very harmful to your eyes. Keep your eyes from the objective lens at least 300mm distance during the pickup

36、 head operating. When you perform solder removal work, please turn OFF a set power supply and perform the ground of human body and a tool. To turn on each laser diode forcibly, press the following buttons on the remote controller. DVD LD: CD LD: After checked the laser current, press POWER or OPEN/C

37、LOSE button to turn it off. ZOOM, 0, 3, 0, ZOOM ZOOM, 0, 3, 1, ZOOM Fig. 1-3-4 Fig. 1-3-5 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Fig. 1-3-6Fig. 1-3-7Fig. 1-3-8 1-9 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?