Mitsubishi DD-8030 Service manual

MITSUBISH ELECTRIC

2002

Service Manual

DVD Player

Model

DD-8030

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 lb. External Dimensions: 17"x 2-3/4"x8-7/8"

(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: More than 108 dB (EIAJ) Harmonic Distortion: Less than 0.002% Wow and flutter: Below measurable level

(less than ± 0.001% (W.PEAK)) (EIAJ)

Operating conditions: Temperature: 5°C to 35°C Operation status: Horizontal Video output: 1.0 V (p-p), 75Ω, negative

sync., pin jack x 1

S Video output: (Y) 1.0 V (p-p), 75Ω, nega-

tive sync., Mini DIN 4-pin x 1 (C) 0.286 V (p-p), 75Ω

Component Video output: (Y) 1.0 V (p-p), 75Ω,

negative sync., pin jack x 1 (Cr, Pr)/(Cb, Pb) 0.7 V (p-p), 75Ω, pin jack x 2

Digital Audio output: (Bitstream/PCM) 0.5 V (p-p),

75Ω, pin jack x 1, Optical connector x 1

Analog Audio output: 2.0 V (rms), 680Ω, pin jack

2 CH L R x 2,

5.1 CH SURROUND x 6

MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.

9351 Jeronimo Rd. Irvine, CA 92618

GENERAL DESCRIPTIONS

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 might be shortened. When replacing the laser diode, LSI's and IC's, use a conductive mat, soldering iron with ground wire, etc. to protect against damage from static electricity.

Ground conductive wrist strap for body.

oldering iron with ground wire or ceramic type

SECTION 1

1MΩ

Conductive mat

The ground resistance between the ground line and the ground is less than 10Ω.

1-1

2. LOCATION OF MAIN PARTS AND MECHANISM PARTS

2-1. Location of Main Parts

Disc motor PC board Feed motor PC board

EU02 Power supply PC board

EU05 Output PC board

EU04 Power SW PC board

EU03 Front display PC board

EU01 Main PC board

Loading motor PC board

Fig. 1-2-1

2-2. Location of Mechanism Parts

2-2-1. Type A

Tra

Clamper sta

Fig. 1-2-2 Mechanism chassis assembly (Top side)

Loading moto

PC board

Mechanism chassis

Fig. 1-2-3 Mechanism chassis assembly (Bottom side)

Loading belt

Loading motor

Gea

Clamper

Cam Slide

Fig. 1-2-4 Mechanism chassis assembly (Internal side)

Rack gear

assembly

Gear A

Disc moto

Pickup assembly

Gear B assembly

Front damper

Sub chassis

Fig. 1-2-5 Pickup mechanism chassis assembly (Top side)

Front dampe

Feed motor

Rear damper

Feed motor

PC board

Rear dampe

Fig. 1-2-6 Pickup mechanism chassis assembly (Bottom side)

2-2-2. Type B

Tr a

Clamper sta

Fig. 1-2-7 Mechanism chassis assembly (Top side)

Loading moto

PC board

Mechanism chassis

Fig. 1-2-8 Mechanism chassis assembly (Bottom side)

Loading belt

Gea

Kick lever

Loading motor

Disc motor

Gea

Cam Slide

Fig. 1-2-9 Mechanism chassis assembly (Internal side)

Front damper

Rack gear assembly

Gear A

Front dampe

Pickup assembly

Gear B assembly

Rear damper

Sub chassis

Rear dampe

Fig. 1-2-10 Pickup mechanism chassis assembly (Top side)

Feed moto

PC boar

Fig. 1-2-11 Pickup mechanism chassis assembly (Bottom side)

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.

Tray close operation Pin C9 of IC306 (E537): LDMP = H/L Pin Y19 of IC306 (E538): LDMN = L

Tray stops. Pin C9 of IC306 : LDMP = H Pin Y19 of IC306 : LDMN = L

Laser OFF Display: INSERT DISC Monitor screen: NO DISC

Is tray closed?

Pin 5 of CN502:

TCLS = L

DVD single (single-layer)

DVD single Initial setting.

DVD single

(single-layer)/DVD dual

(dual-layer)/CD?

DVD dual (dual-layer)

DVD dual Initial setting.

To each disc playback process.

Fig. 1-3-1

CD Initial setting.

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.).

Does pulse of

1.65V 1.65V develop at pin 162 of IC401?

Check feed gear.

Check BUS between IC401-IC306 and oscillation.

Fig. 1-3-2

2-1

"No disc" misjudgement display of

disc presence.

Does lens move with

UP/DOWN full stroke in

focus direction?

Does focus search

voltage of 1.65V 0.4V develop

at pin 23 of IC503 (E544)?

Does search signal

output at both edges of focus coil?

(Pins 15 to 18 of CN501)

Check pickup head and wiring.

Is laser current normal?

Does RFSB signal

develop more than 0.3V?

Check peripheral circuit of IC605.

Check IC401.

Check IC503.

Fig. 1-3-3

Check IC502.

Lens cleaning.

Replace pickup head.

2-2

Check laser operating current.

Check laser current. I min lop I max

Check pins 13, 14 and 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 max

lop I min

Check wiring for pickup head.

Replace pickup

mechanism.

lop 200 mA

Laser operating current

DVD Iop

DVD Iop = Voltage between (E559 and E591) /10

CD Iop = Voltage between (E536 and E591) /10

CD Iop

min 20mA 20mA

35mA 45mA

60mA 80mA

typ max

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 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:ZOOM, 0, 3, 0, ZOOM CD LD: ZOOM, 0, 3, 1, ZOOM After checked the laser current, press POWER or OPEN/CLOSE button to turn it off.

V : 500 mV/div H : 2 ms/div

CD disc

detection waveform

Disc kind misjudgement

(Initial setting is NG.)

Check IC502.

Lens cleaning.

Replace pickup head.

Are FE and RFSB

signals for each disc normal?

Check peripheral circuit of IC605.

Fig. 1-3-4

DVD single (single-layer) disc

detection waveform

TP405 FE signal

TP503 RFSB signal

V : 500 mV/div H : 2 ms/div

Fig. 1-3-6 Fig. 1-3-7 Fig. 1-3-8

1.65V

Fig. 1-3-5

DVD dual (dual-layer) disc

detection waveform

V : 500 mV/div H : 2 ms/div

(2) Picture appears (PLAY)

PLAY

2-1

Disc motor (D.M.) forced

accelleration (500 ms)

Focus search

Is forcus servo

CLV servo ON.

Tracking balance adjustment

Tracking servo ON.

Focus gain adjustment

Tracking gain adjustment

ON?

Repeat three times.

Automatic adjustment is carried out when a disc is replaced after power ON.

Focus balance adjustment

RF gain adjustment

Does NG continue

more than 3 s.?

Disc playback NG

Is address code

possible to read?

Search Picture appears.

Fig. 1-3-9

Disc motor (D.M.) does not rotate.

Does pin 117 of IC401

(TP409) PLCK oscillate around

10 MHz ?

Check peripheral circuit of IC402.

Check peripheral circuits of IC402.

Check disc motor and wiring.

Do signals output to

pins 9 to 14 of CN501?

Check IC502.

Focus servo is NG.

Are FE, RFSB,

FSON signals normal?

Check peripheral circuit of IC306.

Check wiring for

pickup head.

Lens cleaning.

Replace pickup

mechanism.

Fig. 1-3-10

Focus servo ON

signal waveform

Focus search Focus servo on

Fig. 1-3-12

FE signal Pin 150 (TP405) of IC401

0.3V

1.65V

0.3V

RFSB signal Pin 152 (TP503) of IC401

Fig. 1-3-11

Signal waveform at

tracking servo ON (DVD)

Tracking servo is NG.

Signal waveform at

tracking servo ON (CD)

Check IC502.

TE signal Pin 151 (TP406) of IC401

1.65V

RFRP signal Pin 153 (TP408) of IC401

Is TE signal normal?

Check peripheral

circuit of IC306.

Fig. 1-3-13

ON search Tracking servo on

Search ON (SRCH) Pin 38 (TP411) of IC401

Fig. 1-3-15

Fig. 1-3-14

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.

Check peripheral circuits of IC502 and IC401.

Fig. 1-3-16

Does pulse of

L = 1.65V and H = 3.3V

develop at 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?

Pin 43 of IC502 = 2.4V Pin 44 of IC502 = 3.0V

Check peripheral circuits of IC401 and IC306.

Check IC502.

Lens cleaning.

Pickup mechanism

replacement

DVD RF signal

Fig. 1-3-17

CD RF signal

DVD RF signal Pin 30 (TP502) of IC502

V : 500 mV/div H : 50 ns/div

CD RF signal Pin 30 (TP502) of IC502

PLL works as a servo loop to generate a clock signal for reading RF signal binary data. With the PLL locked, the eye pattern is identified clearly when triggered with the read clock PLCK.

DVD playback waveform

DVD RF signal Pin 30 (TP502) of IC502

DVD PLCK Pin 117 (TP409) of IC401

CH1 : TP502 DVDRF 500 mV/div CH2 : TP409 DVDPLCK 5 V/div

50 ns/div

Fig. 1-3-19

CD playback waveform

CD RF signal Pin 30 (TP502) of IC502

Fig. 1-3-18

V : 500 mV/div H : 100 ns/div

CH1 : TP502 CDRF 500 mV/div CH2 : TP409 CDPLCK 5 V/div

100 ns/div

Fig. 1-3-20

CD PLCK Pin 117 (TP409) of IC401

3-1-2. Location Diagram of Servo Test Point

)

CN502

CN603

CN601

IC305

CN503

IC503

IC312

IC313

IC306

CN501

IC502

IC401

CN701

IC902

IC310

IC307

CN901

CN302

Fig. 1-3-21

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

treatment 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 fine 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).

Top cover (2)

Screw (1)

Screws (1)

Screw (1)

1-1-2. Tray Panel

1. Insert a paper clip, etc. into the hole A to eject the tray

(1).

Tray (1)

Front panel

Insert a paper clip, etc. in this hole

Paper clip, etc.

Hole A

Fig. 2-1-1

Fig. 2-1-2

Mechanism chassis assembly

Tray (1)

Pull out the tray (1) toward you.

Tray (1)

Minus screwdriver

Claw A

Minus screwdriver

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 tray panel (2), insert the tray panel (2) along the grooves of the both sides of the tray (1)

until clicking.

1-1-4. Tray

1. Pull out the tray (1) towards 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).

Tray (1)

Tray panel (2)

Tray (1)

Fig. 2-1-3

Claw

Tray Panel (2)

Claw

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).

Bush (1)

1-1-3. Front Panel

1. Remove one flexible cable (1).

2. Release four claws, then remove the front panel (2).

Claw

Front panel (2)

Claws

Screws (2)

Flexible cable (1)

Rear panel (3)

Claw

Fig. 2-1-6

Fig. 2-1-4

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 after 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).

Flexible cables (1)

Twist more than 9 times.

Connector (2)

Screws (3)

Flexible cables (1)

1-2-2. Output PC Board

1. Remove 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).

Flexible cable (3)

Tapes (1)

Flexible cable (3)

Screws (4)

Output PC board (5)

Screws (4)

Connector (2)

Twist more than 9 times.

Tray

Flexible cable (1)

Pickup head

Laser diode output lands

Pickup A Pickup B

Main PC board (4)

Pickup head

Laser diode output lands

Fig. 2-1-8

Fig. 2-1-7

1-2-3. Power PC board

Power SW PC board (5)

Front display PC board (3)

Screws (2)

Screws (6)

Screws (4)

Flexible cable (1)

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).

Screws (4)

Connector (3)

Power bush (1)

Power supply PC board (5)

Tapes (2)

Connector (3)

1-2-4. Front PC Board

1. Remove the front panel. (Refer to item 1-1-3.)

2. Remove the 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).

Twist more than 9 times.

Fig. 2-1-10

Fig. 2-1-9

1-3. Mechanism Parts

1-3-1. Mechanism Chassis Assembly

Note:

• When 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. Remove three flexible cables (1).

3. Remove four screws (2), then remove the mechanism

chassis assembly (3).

Pickup head

Screws (2)

Mechanism chassis assembly (3)

Flexible cables (1)

Laser diode output lands

Pickup A

Pickup head

Laser diode output lands

Pickup B

Fig. 2-1-11

2. REPLACEMENT OF MECHANICAL PARTS (TYPE B)

2-1. Cabinet Replacement

2-1-1. Top Cover

1. Remove seven screws (1), then remove the top cover (2).

Screw (1)

Top cover (2)

Screws (1)

Screw (1)

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.

This part should be touched to the left side of the tray.

Mechanism chassis assembly

Tray

Fig. 2-1-12

2-1-2. Clamper Stay

1. Remove two screws (1).

2. Release two claws and remove the clamper stay (2).

Screws (1)

Clamper stay (2)

Claw

Clamper stay (2)

Claw

Press down by finger unitil fix the clamper assembly

No floating

Fig. 2-1-14

Spring

Floating NG

Spring

Claws

Fig. 2-1-13

2-1-3. Tray Panel

Front panel (2)

Tray (3)

Claws

Claw

Flexible cable (1)

Claw

1. Slide the slider (2) of the mechanism chassis assembly

(1) with a screwdriver, etc. in the arrow direction, so

that the tray (3) is ejected.

Note:

• Take care not to damage the pickup and other parts.

Tray (3)

Tray panel (4)

Screw driver

Slider (2)

Mechanism chassis assembly (1)

Tray (3)

Front panel

Fig. 2-1-15

1. Eject the tray (3).

2. Twist the tray panel (4) a little in the arrow A direction with the tray (3) hold by hand to release two claws and lift up the tray panel (4) in the arrow B direction, then the tray panel (4) is removed. (Refer to Fig. 2-1-16.)

3. When mounting the tray panel (4), insert the tray panel

(4) along the grooves of the both sides of the tray (3)

until clicking.

Tray (3)

Claw

Tray Panel (4)

Claw

Fig. 2-1-16

2-1-4. Front Panel and Tray

1. Remove the flexible cable (1).

2. Release four claws and remove the front panel (2).

3. Pull out the tray (3) towards you.

Fig. 2-1-17

Note:

• Insert the tray (3) with the front side of the pickup mechanism assembly descended. (The slider positions to the left side.)

• The gears are required to match their phases each other. After setting the gear (4) as shown in the figure “A”, insert the tray (3). When inserting a tray (3), push the rack gear side shown by the arrow.

Screws (3)

Twist more than 9 times.

Connector (2)

Flexible cables (1)

Flexible cable (1)

Flexible cables (1)

Main PC board (4)

Tray

Pickup head

Pickup A Pickup B

Laser diode output lands

Pickup head

Laser diode output lands

• Confirm that the mark of the gear matches with the

triangle mark on the reverse side of the tray in the tray

close status. (The gear is rotated with the slider locks.)

(Refer to Fig. B.)

Fig. A

Gear (4) Triangle mark

Position of the line

Pickup mechanism assembly

Gear (4)

Tray rack gear

Slider

2-2. PC Board Replacement

2-2-1. 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 after inserting

the flexible cables (1).

1. Remove the top cover. (Refer to item 2-1-1.)

2. Eject the tray. (Refer to item 2-1-3.)

3. Remove six flexible cables (1) and remove one

connector (2).

4. Remove four screws (3), then remove the main PC

board (4).

Tray (3)

Gear

Fig. 2-1-18

Fig. B

2-1-5. Rear Panel

1. Remove the bush (1).

2. Remove four screws (2), then remove the rear panel

(3).

Bush (1)

Triangle markMarking

Screws (2)

Fig. 2-1-20

Fig. 2-1-19

Rear panel (3)

2-2-2. Output PC Board

1. Remove the top cover. (Refer to item 2-1-1.)

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).

Flexible cable (3)

Tapes (1)

Flexible cable (3)

Screws (4)

Output PC board (5)

Screws (4)

Connector (2)

Twist more than 9 times.

2-2-3. Power PC board

1. Remove the power 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).

Screws (4)

Connector (3)

Power bush (1)

Power supply PC board (5)

Tapes (2)

Connector (3)

Fig. 2-1-21

Twist more than 9 times.

Fig. 2-1-22

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