Mitsubishi-DD8030-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 Component Video output:(Y) 1.0 V (p-p), 75, negative sync., pin jack x 1 (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 jack x 1, Optical connector x 1 Ana

3、log Audio output:2.0 V (rms), 680, 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:17W Weight:5.6

4、lb. External Dimensions:17x 2-3/4x8-7/8 (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 112 dB (EIAJ) Audio Dynamic Range:

5、More than 108 dB (EIAJ) Harmonic Distortion:Less than 0.002% Wow and flutter:Below measurable level (less than 0.001% (W.PEAK) (EIAJ) Service Manual 2002 MITSUBISH ELECTRIC Model DD-8030 DVD Player RadioFans.CN 收音机爱 好者资料库 SECTION 1 GENERAL DESCRIPTIONS SECTION 1 GENERAL DESCRIPTIONS 1M Ground conduc

6、tive 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. The Pickup Head consists of a laser diode that is very susceptible to external static electricity. Although it may operate properly

7、after replacement, if subjected to electrostatic discharge during replacement, its life might 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. 1. PREPARATION FOR SERVICING GENERA

8、L DESCRIPTIONS 1-1 RadioFans.CN 收音机爱 好者资料库 2. LOCATION OF MAIN PARTS AND MECHANISM PARTS 2-1. Location of Main Parts Fig. 1-2-1 EU01 Main PC board EU05 Output PC board EU02 Power supply PC board EU04 Power SW PC board Loading motor PC board Disc motor PC boardFeed motor PC board EU03 Front display P

9、C board RadioFans.CN 收音机爱 好者资料库 2-2. Location of Mechanism Parts 2-2-1. Type A 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 Fig. 1-2-4 Mechanism chassis assembly (Internal side) Loading

10、 belt Loading motor Cam Slider Gear Gear Gear Clamper Fig. 1-2-5 Pickup mechanism chassis assembly (Top side) Fig. 1-2-6 Pickup mechanism chassis assembly (Bottom side) Rack gear assembly Gear A Gear B assembly Sub chassis Pickup assembly Disc motor Feed motor Feed motor PC board Front damper Front

11、damper Rear damper Rear damper 2-2-2. Type B Fig. 1-2-7 Mechanism chassis assembly (Top side) Fig. 1-2-8 Mechanism chassis assembly (Bottom side) Tray Clamper stay Loading motor PC board Mechanism chassis Fig. 1-2-9 Mechanism chassis assembly (Internal side) Loading belt Loading motor Kick lever Cam

12、 Slider Gear Gear Gear Disc motor Fig. 1-2-10 Pickup mechanism chassis assembly (Top 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 Fig. 1-2-11 Pickup mechanism chassis assembly (Bottom side

13、) 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

14、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 C9 of IC306 (E537): LD

15、MP = H/L Pin Y19 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 Pickup (P.U.) transmission initial operation does not occur. The p

16、ickup 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 Doe

17、s pulse of 1.65V 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 bo

18、th edges of focus 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 IC605. Check IC503. Y Y Y Y

19、3 N N N Y N N Fig. 1-3-2 Fig. 1-3-3 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 IC605. 2-2 Y N ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

20、? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

21、? ? Fig. 1-3-4 Fig. 1-3-5 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Fig. 1-3-6Fig. 1-3-7Fig. 1-3-8 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

22、 ? ? ? ? ? ? ? ? ? ? ? ? ? Fig. 1-3-9 (2) Picture appears (PLAY) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Focus servo is NG. Are FE, RFSB, FSON signals normal? Check peripheral circuit of IC306. Do signals output to pins 9 to 14 of CN501? Check IC502. Check wiring for

23、pickup head. Lens cleaning. Replace pickup mechanism. Y Y N N 5 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Fig. 1-3-10 Fig. 1-3-11 Fig. 1-3-12 Tracking servo is NG. Is TE signal normal? Check peripheral circuit of IC306. Check IC502. 6 Y N ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

24、 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Fig. 1-3-13 Fig. 1-3-14 Fig. 1-3-15 DVD RF signal Pin 30 (TP502) of IC502 V : 500 mV/div H : 50 ns/div DVD RF signal ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? CD RF signal Pin 30 (TP502) of IC502 V : 500 mV/div H : 100 ns/div CD RF signal CD RF sign

25、al Pin 30 (TP502) of IC502 CD PLCK Pin 117 (TP409) of IC401 CH1 : TP502 CDRF 500 mV/div CH2 : TP409 CDPLCK 5 V/div 100 ns/div CD playback waveform Fig. 1-3-16 Fig. 1-3-17 Fig. 1-3-19 Fig. 1-3-18 Fig. 1-3-20 PLL works as a servo loop to generate a clock signal for reading RF signal binary data. With

26、the PLL locked, the eye pattern is identified clearly when triggered with the read clock PLCK. Disc playback is NG (DVD). Is PLL locked? (Refer to waveforms.) Check signal process system following to IC402. Check peripheral circuits of IC401 and IC306. Does pulse of L = 1.65V and H = 3.3V develop at

27、 pin 131 and L = 0V and H = 1.65V develop at pin 132 of IC401? Does RF output higher than 1 V(p-p) develop at pin 30 (TP502) of IC502? Check IC502. Lens cleaning. Pickup mechanism replacement Check peripheral circuits of IC401 and IC306. Pin 43 of IC502 = 2.4V Pin 44 of IC502 = 3.0V Check peripheral

28、 circuits of IC502 and IC401. 7 Y N N N N Y Y Y Fig. 1-3-21 3-1-2. Location Diagram of Servo Test Point CN503 CN502 CN603 CN601 CN501 CN701 CN901 CN302 IC502 IC503 IC401 IC312 IC313 IC305 IC306 IC307 IC310 IC902 TP410 FLGA TP401 VRFED TP408 RFRP TP406 TE TP409 PLCK TP412 VMCK TP411 FLGB TP502 RFO TP

29、405 FE TP504 RFCT TP503 RFSB E559 (DVD)E536 (CD) E538 (LDMN) E537 (LDMP) E534 (+5V) SECTION 2 PART REPLACEMENT AND ADJUSTMENT PROCEDURES CAUTIONS BEFORE STARTING SERVICING Electronic parts are susceptible to static electricity and may easily damaged, so do not forget to take a proper grounding treat

30、ment as required. Many screws are used inside the unit. To prevent missing, dropping, etc. of the screws, always use a magnetized screw- driver in servicing. Several kinds of screws are used and some of them need special cautions. That is, take care of the tapping screws securing molded parts and fi

31、ne pitch screws used to secure metal parts. If they are used improperly, the screw holes will be easily damaged and the parts can not be fixed. 1. REPLACEMENT OF MECHANICAL PARTS (TYPE A) 1-1. Cabinet Replacement 1-1-1. Top Cover 1. Remove seven screws (1), then remove the top cover (2). Fig. 2-1-1

32、1-1-2. Tray Panel 1. Insert a paper clip, etc. into the hole A to eject the tray (1). Fig. 2-1-2 Tray (1) Front panel Insert a paper clip, etc. in this hole Paper clip, etc. Hole A Screw (1) Top cover (2) Screws (1) Screw (1) Screws (2) Rear panel (3) Bush (1) 1-1-4. Tray 1. Pull out the tray (1) to

33、wards you until it stops. 2. Lift up claw A with a minus screwdriver, and pull out the tray (1) towards you, then remove the tray (1). Fig. 2-1-5 1-1-5. Rear Panel 1. Remove the bush (1). 2. Remove four screws (2), then remove the rear panel (3). Fig. 2-1-6 A Tray panel (2) Tray (1) Tray (1) Tray Pa

34、nel (2) Claw Claw B A B 1. Eject the tray (1). (Refer to item 1-1-2.) 2. Twist the tray panel (2) a little in the arrow A direction with the tray (1) hold by hand to release two claws and lift up the tray panel (2) in the arrow B direction, then the tray panel (2) is removed. 3. When mounting the tr

35、ay panel (2), insert the tray panel (2) along the grooves of the both sides of the tray (1) until clicking. Front panel (2) Claws Claw Flexible cable (1) Claw Fig. 2-1-3 1-1-3. Front Panel 1. Remove one flexible cable (1). 2. Release four claws, then remove the front panel (2). Fig. 2-1-4 Mechanism

36、chassis assembly Tray (1) Pull out the tray (1) toward you. Tray (1) Minus screwdriver Claw A Minus screwdriver 1-2. PC Board Replacement 1-2-1. Main PC Board Note: Before removing the main PC board (4), be sure to short-circuit the laser diode output land. After replacing, open the land as it was a

37、fter inserting the flexible cables (1). 1. Remove the top cover. (Refer to item 1-1-1.) 2. Eject the tray. (Refer to item 1-1-2.) 3. Remove six flexible cables (1) and remove one connector (2). 4. Remove four screws (3), then remove the main PC board (4). Fig. 2-1-7 1-2-2. Output PC Board 1. Remove

38、the top cover. (Refer to item 1-1-1.) 2. Peel off two tapes (1) and remove the connector (2). 3. Remove two flexible cables (3). 4. Remove five screws (4), then remove the output PC board (5). Fig. 2-1-8 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Screws (4) Con

39、nector (2) Flexible cable (3) Flexible cable (3) Screws (4) Output PC board (5) Tapes (1) Twist more than 9 times. 1-2-3. Power PC board 1. Remove the bush (1). 2. Peel off two tapes (2) and remove two connectors (3). 3. Remove four screws (4), then remove the power supply PC board (5). Fig. 2-1-9 C

40、onnector (3) Connector (3) Power supply PC board (5) Tapes (2) Screws (4)Power bush (1) Twist more than 9 times. Power SW PC board (5) Front display PC board (3) Screws (2) Screws (6) Screws (4) Flexible cable (1) 1-2-4. Front PC Board 1. Remove the front panel. (Refer to item 1-1-3.) 2. Remove the

41、flexible cable (1). 3. Remove nine screws (2), then remove the front display PC board (3). 4. Remove two screws (4), then remove the power switch PC board (5). 5. Remove three screws (6), then remove the ENTER switch (7). Fig. 2-1-10 1-3. Mechanism Parts 1-3-1. Mechanism Chassis Assembly Note: When

42、removing the mechanism chassis assembly (3), be sure to short-circuit the laser diode output land before removing the connector and the flexible cables. After replacing, open the land as it was after inserting the connector and flexible cables. 1. Remove the front panel. (Refer to item 1-1-3.) 2. Re

43、move three flexible cables (1). 3. Remove four screws (2), then remove the mechanism chassis assembly (3). Fig. 2-1-11 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 2. REPLACEMENT OF MECHANICAL PARTS (TYPE B) 1. The spring for tray side pressure is inserted into the portion “A”. (Refer to Fig. 2-1-13.) 2. By referring to Fig. 2-1-14, insert the spring normally and mount the clamper stay. Fig. 2-1-14 2-1. Cabinet Replacement 2-1-1. Top Cover 1. Remove seven screws (1), then remove the top co