Mitsubishi DD-5000 Service manual

2000

MITSUBISH ELECTRIC

DD-5000

POWER

STANDBY

TITLE TRK CHP TOTAL REMAIN MEMORY

HDCD

CDVD

SerSer

Ser

SerSer ManualManual

Manual

ManualManual

vicevice

vice

vicevice

DVD Player

Model

DD-5000

OPEN/CLOSE

STOP PLAY PAUSE/STEP

REV

FWD

SKIP

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: 17"x 3-1/4"x12-1/4"

(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)

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

Color Difference output: (Y) 1.0 V (p-p), 75Ω, nega-

tive sync., pin jack x 1 (Cr)/(Cb) 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), 330Ω, 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

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.

SAFETY NOTICE

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

product’s 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 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 Ω per volt or more sensitivity.

Connect a 1500 Ω 10 W resistor, paralleled by a 0.15 µF

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.).

READING SHOULD NOT EXCEED 0.3V

Measure the AC voltage across the 1500 Ω 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.

DVD VIDEO PLAYER

AC OUTLET

Test all exposed metal. Voltmeter Hook-up for Leakage Current Check

1500

10 W

0.15 µF 150V AC

AC VOLTMETER

(5000 W per volt or more sensitivity)

Good earth ground such as a water pipe, conduit, etc.

CONTENTS

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

SECTION 1

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

PART REPLACEMENT AND ADJUSTMENT PROCEDURES

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

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

SECTION 2

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

SECTION 3

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

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

SECTION 4

PARTS LIST

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

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, 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.

Soldering iron with ground wire or ceramic type

Conductive mat

1MΩ

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

Fig. 1-1-1

1-1

2. LOCATION OF MAIN PARTS AND MECHANISM PARTS

EU05 Output PC board

Feed motor PC board

EU03 Front display PC board

Loading motor PC board

Disc motor PC board

EU04 Power SW PC board

EU01 Main PC board

EU02 Power supply PC board

2-1. Location of Main Parts

Fig. 1-2-1

1-2

2-2. Location of Mechanism Parts

Tr a

Clamper sta

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

Loading moto

PC boar

Mechanism chassi

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

1-3

Loading belt

Gea

Kick lever

Loading motor

Disc motor

Gea

Cam Slide

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

1-4

Front damper

Gear A

Gear B assembly

Rack gear assembly

Front dampe

Sub chassis

Pickup assembl

Rear damper

Rear dampe

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

Feed moto

PC boar

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

1-5

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 6 of IC601: LDMP = H/L Pin 7 of IC601: LDMN = L

Tray stops. Pin 6 of IC601: LDMP = H Pin 7 of IC601: 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

1-6

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 IC502?

Check feed gear.

Check BUS between IC502 and IC601 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 1 of IC504 (E597)?

Does search signal

output at both edges of focus coil?

(Pins 10 to 13 of CN501)

Check pickup head and wiring.

Is laser current normal?

Does SBAD signal

develop more than 0.3V?

Check peripheral circuit of IC601.

Check IC502.

Check IC505.

Fig. 1-3-3

Check IC501.

Lens cleaning.

Replace pickup head.

1-7

2-2

Disc kind misjudgement

(Initial setting is NG.)

Are FE and SBAD

signals for each disc normal?

Check peripheral circuit of IC601.

Check IC501.

Lens cleaning.

Replace pickup head.

Fig. 1-3-4

Check laser current.

lop 50 mA

Check pins 14, 15 and 16 of IC501 serial bus.

Check peripheral circuits of IC501, Q501 and Q502.

Check laser current.

50 mA lop 90 mA

lop = Voltage between E522 and E523/3.3Ω

Check peripheral circuits

of IC501, Q501 and Q502.

lop 90 mA

Check wiring for

pickup head.

Replace pickup

mechanism.

Fig. 1-3-5

DVD single (single-layer) disc

detection waveform

FE signal

Pin150 (TP504) of IC502

SBAD signal

Pin152 (TP506) of IC502

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

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

1.65V

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

1-8

(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

1-9

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

Do signals output to

pins 4 to 9 of CN501?

Check IC501.

Does pin 117 of IC502

(TP511) PLCK oscillate around

10 MHz ?

Check peripheral circuits of IC510 and IC503.

Check disc motor and wiring.

Focus servo is NG.

Are FE, SBAD,

FSON signals normal?

Check peripheral circuit of IC601.

Check wiring for

pickup head.

Lens cleaning.

Replace pickup

mechanism.

Fig. 1-3-10

Check peripheral circuit of IC503.

Focus servo ON

signal waveform

Focus search Focus servo on

Fig. 1-3-12

FE signal Pin 150 (TP504) of IC502

0.3V

1.65V

0.3V

SBAD signal Pin 152 (TP506) of IC502

Fig. 1-3-11

1-10

Tracking servo is NG.

Signal waveform at

tracking servo ON (CD)

Check IC501.

Fig. 1-3-13

TE signal Pin 151 (TP503) of IC502

1.65V

RFRP signal Pin 153 (TP501) of IC502

Is TE signal normal?

Check peripheral

circuit of IC601.

Signal waveform at

tracking servo ON (DVD)

ON search Tracking servo on

Fig. 1-3-14

Search ON (SRCH) Pin 38 (TP508) of IC502

Fig. 1-3-15

1-11

Disc playback is NG (DVD).

Is PLL locked?

(Refer to waveforms.)

Check signal process system following to IC503.

Check peripheral circuits of IC502 and IC601.

Check peripheral circuits of IC501and IC502.

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 IC502?

Does RF output

higher than 1.5 V(p-p)

develop at pin 45 (TP515)

of IC501 ?

Pin 57 of IC501 = 2.4V Pin 58 of IC501 = 3.0V

Check peripheral circuits of IC502 and IC601.

Check IC501.

Lens cleaning.

Pickup mechanism

replacement

DVD RF signal

CD RF signal

Fig. 1-3-17

DVD RF signal Pin 45 (TP515) of IC501

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

CD RF signal Pin 45 (TP515) of IC501

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 45 (TP515) of IC501

DVD PLCK Pin 117 (TP511) of IC502

CH1 : TP515 DVDRF 500 mV/div CH2 : TP511 DVDPLCK 5 V/div

50 ns/div

Fig. 1-3-19

CD playback waveform

CD RF signal Pin 45 (TP515) of IC501

Fig. 1-3-18

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

1-12

CH1 : TP515 CDRF 500 mV/div CH2 : TP511 CDPLCK 5 V/div

100 ns/div

Fig. 1-3-20

CD PLCK Pin 117 (TP511) of IC502

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

E594 DMDRV

E595 FMDRV

E596 TRDRV

E597 FODRV

CN503

CN502

CN602

E523

E522

TP515 RF

IC504

IC501

IC601

TP506 RFSB (SBAD)

IC502

CN501

TP503 TE

IC502

CN801

CN901

IC305

CN301

TP505 VREF

TP504 FE

TP501 RFRP

TP511 PLCK

TP507 FSON

TP509 VMCK (23MHz)

TP508 SRCH

Fig. 1-3-21

1-13

This page is not printed.

1-14

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 ground-

ing treatment as required.

Many screws are used inside the unit. To prevent missing, dropping, etc. of the screws, always use a magnetized

screwdriver 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 improp-

erly, the screw holes will be easily damaged and the parts can not be fixed.

1. REPLACEMENT OF MECHANICAL PARTS

1-1. Cabinet Replacement

1-1-1. Top Cover

1. Remove five screws (1) and remove the top cover (2).

Screw (1)

Top cover (2)

Screws (1)

Screw (1)

1-1-2. 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

Fig. 2-1-1

2-1

Spring

Claws

Fig. 2-1-2

1. The spring for tray side pressure is inserted into the

portion “A”. (Refer to Fig. 2-1-2.)

2. By referring to Fig. 2-1-3, insert the spring normally

and mount the clamper stay.

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

1-1-3. Tray Panel

1. Slide the slider (2) of the mechanism chassis assem-

bly (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.

Mechanism chassis assembly

Press down by finger unitil fix the clamper assembly

Spring

Tray

Screw driver

Mechanism chassis assembly (1)

Slider (2)

Tray (3)

Front panel

Fig. 2-1-4

No floating

Fig. 2-1-3

Floating NG

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. 2-1-5.)

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.

2-2

Tray (3)

• After inserting the tray (3), confirm that the mark of

the gear (4) matches with that of the rack gear on the

tray (first tooth of the gear). (Refer to Fig. B.)

Figure A

Gear (4)

Triangle mark

Tray panel (4)

Tray (3)

Claws

Tray panel (4)

Fig. 2-1-5

1-1-4. 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) to this side.

The first tooth of the gear of this side on the tray rack gear.

Rack gear

Position of the line

Pickup mechanism assembly

Gear (4)

Slider

Tray (3)

Gear (4)

Claw

Tray (3)

Claws

Front panel (2)

Flexible cable (1)

Claw

Fig. 2-1-6

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.

Marking

Figure B

Fig. 2-1-7

1-1-5. Rear Panel

1. Remove three screws (1) and remove the rear panel (2).

Screw (1)

Rear panel (2)

Fig. 2-1-8

2-3

Tape (3)

Connector (2)

Screws (4)

Screws (5)

Flexible cables (1)

Output PC board (6)

Twist more than 9 times.

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. Remove six flexible cables (1) and remove one

connector (3).

3. Remove four screws (2).

4. Release two claws and remove the main PC board (4).

Note:

• When mounting, be sure to twist the wire for the

connector (3) several times.

Pickup head

1-2-2. Output PC Board

1. Remove the rear panel. (Refer to item 1-1-4

2. Peel off the tape (1).

3. Remove the connector (2).

4. Disconnect two flexible cables (3).

5 Remove the wire part of the connector (5) from the

binding band (4).

6. Remove three screws (6) and remove the output PC

board (7).

Note:

• When mounting, keep the wire part of the connector

(5) with the banding band (4).

Output PC board (7)

Tape (1)

Binding band (4)

Screws (6)

Laser diode output land

Flexible cables (1)

Main PC board (4)

Claws

Connector (2)

Screws (2)

Connector (3)

Flexible cables (1)

Flexible cables (3)

Connector (5)

Fig. 2-1-10

Twist more than 7 times.

Fig. 2-1-9

2-4

1-2-3. Power PC board

1. Peel off the tape (1).

2. Remove the connectors (2) and (3).

3. Release the wire part of the connector with the

binding band (4) tightened.

4. Remove three screws (5).

5. Remove two screws (6).

6. Release two claws and remove the power supply PC

board (7).

Power PC board (7)

1-2-4. Front PC Board

1. Remove the front panel. (Refer to item 1-1-4.)

2. Remove four screws (1) and remove the front display

PC board (2)

3. Remove two screws (3) and remove the power switch

PC board (4).

Power SW PC board (4)

Screws (3)

Front display PC board (2)

Screws (1)

Screws (5)

Claws

Connector (2)

Tape (1)

Screws (6)

Connector (3)

Fig. 2-1-12

Binding band (4)

Fig. 2-1-11

2-5

+ 53 hidden pages