Mitsubishi-DD5000-dvd-sm 电路图 维修手册.pdf

MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC. 9351 Jeronimo Rd. Irvine, CA 92618 Copyright 2000 Mitsubishi Digital Electronics America, Inc. All Rights Reserved Operating conditions:Temperature: 5 C to 35C Operation status:Horizontal Video output:1.0 V (p-p), 75, negative sync., pin jack x 1 S Video output:(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 output:(Y) 1.0 V (p-p), 75, nega- tive sync., pin jack x 1 (Cr)/(Cb) 0.7 V (p-p), 75, pin jack x 2 Digital Audio output:(Bitstream/PCM) 0.5 V (p-p), 75, pin jack x 1, Optical connector x 1 Analog Audio output:2.0 V (rms), 330, 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 Power Consumption:19W Weight:6.7 lb. External Dimensions:17x 3-1/4x12-1/4 (W/H/D) Signal System:Standard NTSC Laser:Semiconductor laser, wavelength 650 nm Frequency Range:(Digital Audio) Audio CD:4 Hz to 20 kHz DVD Linear - 48 kHZ Sampling: 4 Hz to 22 kHz 96 kHZ Sampling: 4 Hz to 44 kHz Signal-To-Noise Ratio: More than 112 dB (EIAJ) Audio Dynamic Range: More than 106 dB (EIAJ) Harmonic Distortion:Less than 0.001% Wow and flutter:Below measurable level (less than 0.001% (W.PEAK) (EIAJ) SerSerSerSerServicevicevicevicevice ManualManualManualManualManual 2000 MITSUBISH ELECTRIC Model DD-5000 DVD Player OPEN/CLOSE STOPPLAYPAUSE/STEP POWER DD-5000 STANDBY SKIP REVFWD / / CDVD TITLE TRKCHPTOTALREMAINMEMORY HDCD RadioFans.CN 收音机爱 好者资料库 LASER BEAM CAUTION LABEL When the power supply is on, do not remove 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 magnitude 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 RadioFans.CN 收音机爱 好者资料库 SAFETY PRECAUTIONS LEAKAGE CURRENT CHECK Plug the AC line cord directly into a 120V AC outlet (do not use 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 the cabinet (antennas, handle bracket, 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 indicates 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 VOLTMETER (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 SECTION 2 PART REPLACEMENT 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 .3-3 2-5. Waveform and Voltage Measurement.3-3 2-6. When Replaced ROM ICs or Upgraded Firmware .3-4 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 .3-17 5. CIRCUIT DIAGRAMS .3-18 5-1. Power Supply Circuit Diagram .3-18 5-2. Front Display, Power Switch Circuit Diagram.3-21 5-3. Main Circuit Diagram .3-24 5-4. Output Circuit Diagram.3-41 5-5. Motor System Circuit Diagrams .3-47 6. PC BOARDS .3-49 6-1. Power Supply PC Board.3-49 6-2. Main PC Board .3-50 6-3. Output PC Board .3-55 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 Replacement.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. Mechanism 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. 1-6 3-1. Main Circuit .1-6 3-1-1. Servo System .1-6 3-1-2. Location Diagram of Servo Test Point .1-13 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 Assembly .4-2 4-2. Chassis Assembly .4-3 4-3. Mechanism Assembly .4-4 5. PARTS LIST .4-5 1-1 SECTION 1 General Descriptions 1. PREPARATION FOR SERVICING 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 may be shortened. When replacing the laser diode, LSIs and ICs, use a conductive mat, soldering iron with ground wire, etc. to protect against damage from static electricity. 1M Ground conductive wrist strap for body. Soldering iron with ground wire or ceramic type Conductive mat The ground resistance between the ground line and the ground is less than 10. Fig. 1-1-1 1-2 2. LOCATION OF MAIN PARTS AND MECHANISM PARTS 2-1. Location of Main Parts Fig. 1-2-1 EU05 Output PC board Feed motor 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 1-3 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 Clamper stay Loading motor PC board Mechanism chassis 1-4 Fig. 1-2-4 Mechanism chassis assembly (Internal side) Loading belt Loading motor Kick lever Cam Slider Gear Gear Gear Disc motor 1-5 Fig. 1-2-5 Pickup mechanism chassis assembly (Top side) Fig. 1-2-6 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. TROUBLESHOOTING 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? DVD 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 6 of IC601: LDMP = H/L Pin 7 of IC601: LDMN = L Is tray closed? Pin 5 of CN502: TCLS = L Y N Tray stops. Pin 6 of IC601: LDMP = H Pin 7 of IC601: LDMN = L Laser OFF Display: INSERT DISC Monitor screen: NO DISC Y Y NG N N 2 Fig. 1-3-1 H 1-7 Pickup (P.U.) transmission initial operation does not occur. The pickup transmission 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 1.65V 1.65V develop at pin 162 of IC502? Check BUS between IC502 and IC601 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 IC502. Does search signal output at both edges of focus coil? (Pins 10 to 13 of CN501) Does focus search voltage of 1.65V 0.4V develop at pin 1 of IC504 (E597)? Check pickup head and wiring. Does SBAD signal develop more than 0.3V? Check IC501. Lens cleaning. Replace pickup head. Check peripheral circuit of IC601. Check IC505. Y Y Y Y 3 N N N Y N N Fig. 1-3-2 Fig. 1-3-3 1-8 Disc kind misjudgement (Initial setting is NG.) Replace pickup head. Lens cleaning. Check IC501. Are FE and SBAD signals for each disc normal? Check peripheral circuit of IC601. 2-2 Y N Check laser current. Check laser current. 50 mA lop 90 mA Check pins 14, 15 and 16 of IC501 serial bus. Check peripheral circuits of IC501, Q501 and Q502. lop = Voltage between E522 and E523/3.3 Replace pickup mechanism. Check wiring for pickup head. Check peripheral circuits of IC501, Q501 and Q502. lop 90 mAlop 50 mA 3 Y Fig. 1-3-4 Fig. 1-3-5 DVD single (single-layer) disc detection waveform FE signal Pin150 (TP504) of IC502 SBAD signal Pin152 (TP506) of IC502 1.65V V : 500 mV/div H : 2 ms/div DVD dual (dual-layer) disc detection waveform V : 500 mV/div H : 2 ms/div CD disc detection waveform V : 500 mV/div H : 2 ms/div Fig. 1-3-6Fig. 1-3-7Fig. 1-3-8 1-9 Disc motor (D.M.) forced accelleration (500 ms) Focus search PLAY Is forcus servo ON? CLV servo ON. Tracking balance adjustment Tracking servo ON. Focus gain adjustment Tracking gain adjustment Focus balance adjustment RF gain adjustment Repeat three times. Is address code possible to read? Search Picture appears. Does NG continue more than 3 s.? Disc playback NG 4 2-15 4 6 Y N N Y Y : Automatic adjustment is carried out when a disc is replaced after power ON. N N N Y Y N N Y Y Fig. 1-3-9 (2) Picture appears (PLAY) 1-10 4 Disc motor (D.M.) does not rotate. Does pin 117 of IC502 (TP511) PLCK oscillate around 10 MHz ? Check peripheral circuit of IC503. Check peripheral circuits of IC510 and IC503. Check disc motor and wiring. N Y Focus servo is NG. Are FE, SBAD, FSON signals normal? Check peripheral circuit of IC601. Do signals output to pins 4 to 9 of CN501? Check IC501. Check wiring for pickup head. Lens cleaning. Replace pickup mechanism. Y Y N N 5 FE signal Pin 150 (TP504) of IC502 SBAD signal Pin 152 (TP506) of IC502 0.3V 1.65V 0.3V Focus searchFocus servo on Focus servo ON signal waveform Fig. 1-3-10 Fig. 1-3-11 Fig. 1-3-12 1-11 Tracking servo is NG. Is TE signal normal? Check peripheral circuit of IC601. Check IC501. 6 Y N Signal waveform at tracking servo ON (CD) TE signal Pin 151 (TP503) of IC502 1.65V RFRP signal Pin 153 (TP501) of IC502 Search ON (SRCH) Pin 38 (TP508) of IC502 ON searchTracking servo on Signal waveform at tracking servo ON (DVD) Fig. 1-3-13 Fig. 1-3-14 Fig. 1-3-15 1-12 Disc playback is NG (DVD). Is PLL locked? (Refer to waveforms.) Check signal process system followi