Nad T-531-B-2 Schematic

SERVICE MANUAL

T531B T531C

T531AH

DVD VIDEO PLAYER

MODELS : T531B/T531C/T531AHSERVICE MANUAL

NAD ELECTRONICS INTERNATIONAL TORONTO

T531B/T531C

T531AH

DVD VIDEO PLAYER

T531B/T531C

T531AH

DVD VIDEO PLAYER

CONTENTS

SECTION 1 . . . .SUMMARY

SECTION 2 . . . .CABINET & MAIN CHASSIS

SECTION 3 . . . .ELECTRICAL

SECTION 4 . . . .MECHANISM

SECTION 5 . . . .REPLACEMENT PARTS LIST

SECTION 1

SUMMARY

CONTENTS

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

........................... 1-3

SERVICING PRECAUTIONS .................................................................................................. 1-4

• General Servicing Precautions

• Insulation Checking Prodedure

• Electrostatically Sensitive Devices

SPECIFICATIONS ...................................................................................................................... 1-5

1-3

Prior to shipment from the factory, the products are strictly inspected to conform with the recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.

• Precautions during Servicing

1. Locations requiring special caution are denoted by labels and inscriptions on the cabinet, chassis and certain parts of the product. When performing service, be sure to read and comply with these and other cautionary notices appearing in the operation and service manuals.

2. Parts identified by the symbol and shaded (

) parts are critical for safety. Replace only with specified part numbers. Note : Parts in this category also include those specified to comply with X-ray emission standards for

products using cathode ray tubes and those specified for compliance with various regulations regarding spurious radiation emission.

3. Use Specified internal wiring. Note especially:

1) Double insulated wires

2) High voltage leads

4. Use specified insulating materials for hazardous live parts. Note especially:

1) Insulation Tape

2) PVC tubing

3) Spacers

4) Insulation sheets for transistor

5. Observe that wires do not contact heat producing parts (heatsinks, oxide metal film resistors, fusible resistors, etc.)

6. Check that replaced wires do not contact sharp edged or pointed parts.

7. 1) When a power cord has been replaced, check

that A mark is made on the cord, under strain, near the aperture, and the flexible cord is subjected 100 times to a pull of 40N for a duration of 1 second each.

2) During the test, the cord shall not be displaced by

more than 2mm

8. Also check areas surrounding repaired locations.

IMPORTANT SAFETY PRECAUTIONS

Fig. 1

Power cord

1-4

Fig. 3

SAFETY CHECK AFTER SERVICING

Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires have been returned to original positions. Afterwards, perform the following tests and confirm the specified values in order to verify compliance with safety standards.

• Insulation resistance test

confirm the specified insulation resistance or greater between power cord plug prongs and externally exposed parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.) See table below.

• Dielectric strength test

Confirm specified dielectric strength or greater between power cord prongs and exposed accessible parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.) See table below.

• Clearance distance

When replacing primary circuit components, confirm specified clearance distance (d), (d') between soldered terminals, and between terminals and surrounding metallic parts. See table below.

Table 1 : Ratings for selected areas

* Class II model only.

Note. This table is unofficial and for reference only. Be sure to confirm the precise values for your particular

country and locality.

• Leakage Current test

Confirm specified or lower leakage current between B(earth ground, power cord plug prongs) and externally exposed accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.)

Measuring Method: (Power ON) Insert load Z between B(earth ground, power cord plug prongs) and exposed accessible parts. Use an AC voltmeter to measure across both terminals of load Z. See figure and following table.

Table 2:Leakage current ratings for selected areas.

Note. This table is for IEC member only. Be sure to confirm the precise values for your particular country and

Note. locality.

Fig. 2

AC Line Voltage

100 to 130 V 200 to 240 V

*100 to 130 V

*200 to 240 V

Australia

Europe

Australia

Europe

Other terminals

Antenna earth

terminals

i E 0.7m A peak i

E 2m A DC

E 0.7m A peak

E 2m A DC

F 10 MΩ/500 V DC

4kV 1 minute

F 6mm(d) F 8mm(d)

(a Power cord)

Region

Load Z Leakage Current(i)

Earth Ground

(B) to :

Region

Insulation

Resistance

Dielectric

Strength

Clearance

Distance(d),(d)

Ω

50k

Ω

Primary circuit terminals

Chassis

Exposed accessible part

Load

Earth Ground, Power cord plug prongs

AC Voltmeter

1-5

SPECIFICATIONS

DVD VIDEO PLAYER

Power supply AC 110~240V, 50/60Hz(T531B, T531C)

AC 120V, 60Hz(T531AH) Power consumtion 16W Mass 3.0kg(6.6lbs) External dimensions 435 x 88 x 247 mm (W x H x D) Signal system PAL 625/50, NTSC 525/60 Laser Semiconductor laser, wavelength 650nm Frequency range (digital audio) 4Hz to 20kHz Signal-to-noise ratio (digital audio) More than 100dB (EIAJ) Audio dynamic range (digital audio) More than 95dB (EIAJ) Harmonic distortion(digital audio) 0.008% Wow and flutter Below measurable level (less than +0.001%(W.PEAK)) (EIAJ) Operations Temperature : 5˚C(41˚F) to 35˚C(95˚F),

Operation status : Horizontal

OUTPUTS

Video outputs 1.0V(p-p), 75Ω, negative sync., RCA jack x 1/

SCART(TO TV) (T531C ONLY) S video outputs (Y)1.0V(p-p), 75Ω, negative sync.,Mini DIN 4-pin x 1

(C)0.286V(p-p), 75Ω Audio output(digital audio) 0.5V(p-p), 75Ω, RCA jack X 1 Audio output(optical audio) Optical connector x 1 Audio output(analog audio) 2.0Vrms (1kHz, 0dB), 330Ω, RCA jack (L, R) x 1/

SCART(TO TV) (T531C ONLY)

*Designs and specifications are subject to change without notice. *Weight and dimensions shown are approximate.

2-1

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

1. DISASSEMBLY.........................................................................................................................2-2

CABINET DISASSEMBLY ............................................................................................................2-2

CIRCUIT BOARD DISASSEMBLY ...............................................................................................2-3

2. EXPLODED VIEWS ................................................................................................................2-4

1. Cabinet and Main Frame Section...........................................................................................2-4

2. Packing Accessory Section....................................................................................................2-5

2-2

DISASSEMBLY

CAUTION BEFORE STARTING SERVICING

Electronic parts are susceptible to static electricity and may easily and 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.

Top Case

(A)

Tray Door

Disc Tray

Front Panel

Stopper

(B)

CABINET DISASSEMBLY

1. Top Case

1. Release 7 screws (A). (See Fig. 2-1)

2. Lift the top case with holding the back of it, and remove it in the direction of the arrow

Fig. 2-1

Fig. 2-2

Fig. 2-3

3. Front Panel

1. Eject the disc tray. (See Fig. 2-2)

2. Remove the tray door. (See Fig. 2-2)

3. Release 2 screws (B).

4. Pull the front panel toward you while pressing 7 stoppers to disengage, and remove the front panel. (See Fig. 2-3)

2.Tray Door

1. Eject the disc tray.

2. Lift up the tray door in the direction of the arrow.

2-3

Main Circuit Board

(C)

Power Code

Interface Board

(D)

Scart

Key Circuit Board

(E)

(5, 6, 7 TOOL ONLY)

Fig. 2-4

Fig. 2-5

1. Disassembling of Main Circuit Board and Interface Board

1. Remove the top case.(See Fig. 2-1)

2. Remove 12 screw (C).

3. Remove the deck from Main Circuit Board.

4. Remove Main Circuit Board from Interface Board.

5. Remove 2 screw (D).

6. Remove Interface Board from the chassis.

CIRCUIT BOARD DISASSEMBLY

Note: Before removing the main circuit board, be sure to shortcircuit the laserdiode output land.

After replacing the main circuit board, open the land after inserting the flexible connector. (Refer to Mechanism Disassembly)

2. Digitron and Key Circuit Board

1. Remove the front panel.(See Fig. 2-3)

2. Release 4 screws (E), and remove the digitron circuit board.

2-4

EXPLODED VIEWS

1. Cabinet and Main Frame Section

280

465

467

465

463

A46

463

275

332

PBP00

PBT00

283

260

467

300

467

A48

A43

250

462

463

452

285

OPTIONAL PART

Scart

BCD

2-5

2.Packing Accessory Section

BATTERY

808

PACKING SHEET

804

PACKING

OPTIONAL PARTS

803

806

OWNER'S MANUAL

RF CABLE

810

CABLE SET ASS'Y

801

REMOCON

900

BOX CARTON

802

PACKING

803

811

812

PLUG ASS'Y 1WAY

PLUG ASS'Y 2WAY

3-1

SECTION 3

ELECTRICAL

CONTENTS

ELECTRICAL TROUBLESHOOTING GUIDE......................................................................3-2

1. Power(SMPS) Circuit...............................................................................................................3-2

2. µ-com Circuit............................................................................................................................3-3

3. MPEG Circuit............................................................................................................................3-6

4. Front Circuit(Digitron & Key) .................................................................................................3-7

5. RF/Servo Circuit ......................................................................................................................3-8

BLOCK DIAGRAMS..................................................................................................................3-12

1. Overall Block Diagram ..........................................................................................................3-12

2. Power (SMPS) Block Diagram..............................................................................................3-14

3. RF/CD DSP/DVD DSP/DVD servo Block Diagram ..............................................................3-18

4. Audio Block Diagram ............................................................................................................3-19

5. MPEG Block Diagram............................................................................................................3-17

6. µ-COM Block Diagram ...........................................................................................................3-18

CIRCUIT DIAGRAMS................................................................................................................3-19

1. Power (SMPS) Circuit Diagram ............................................................................................3-19

2. DVD DSP Circuit Diagram.....................................................................................................3-23

3. Drive & RF Circuit Diagram ..................................................................................................3-25

4. MPEG Circuit Diagram ..........................................................................................................3-27

5. Audio DM Circuit Diagram....................................................................................................3-29

6. µ-COM/Expander ....................................................................................................................3-31

7. DIGITRON & Key Circuit Diagram........................................................................................3-33

8. Scart Circuit Diagram............................................................................................................3-35

9. Jack Circuit Diagram.............................................................................................................3-37

• CIRCUIT VOLTAGE CHART ....................................................................................................3-39

• WAVEFORMS ...........................................................................................................................3-45

PRINTED CIRCUIT DIAGRAMS............................................................................................3-47

1. MAIN P.C.BOARD...................................................................................................................3-47

2. POWER, A/V, FRONT P.C.BOARD ........................................................................................3-49

3. KEY P.C.BOARD.....................................................................................................................3-51

4. POWER LED P.C.BOARD ......................................................................................................3-51

3-2

ELECTRICAL TROUBLESHOOTING GUIDE

No 5V_D or 5V_A .

No 5.2VA.

Is 5.2VA section working?

Is oscillation present at the Base of Q108?

Replace Q108.

Check L103, C116.

Replace R111.

Replace BD101.

(Bridge rectifier)

Check Fuse(F101).

Is R111 1Ω?

Check D105.

Replace Q101, 102.

Is 5.2V applied to IC108 Pin 1?

Is there a DC voltage at the

(+) terminal of BD101?

Check R127, 128.

(SHUTDOWN CKT)

1. Power(SMPS) Circuit

No VF+

Is 5.2VA section working?

Replace D109.

Is oscillation present at the anode of D109?

YES

A. B.

3-3

Replace IC506.

Refer to Front Part

Check short

Reconnect it.

2. µ-COM Circuit

A. No Power

Does Logo appear

on the screen?

Is oscillation of

X501 normal?

Are IC503 Pins 14, 288

and 29 normal?

Does no DISC appear?

Does Hello

appear at FLD?

Is P5901

connected normally?

Is P5901 Pin 23 normal?

The

waveform on A[00:21]

and D[00:15] of IC501

normal?

Are IC506 Pins 7, 8 normal?

Replace Main B/D.

Check the oscillation

Check short.

Replace IC501

or IC503.

Check power.

(Refer to power)

If power is normal

POWER ON

YES

NONO

3-4

B. Audio abnormal

D. Open/Close abnormal

Check the

connection of P5901.

Check IC501 Pins 13, 14.

Check Audio jack.

YES (If OK)

YES

(If OK)

YES

(If OK)

YES (If OK)

Check MPEG_CLK Signal of MPEG part.

Refer to Audio part.

Refer to MPEG part.

Replace B/D.

Check Front.

Reconnect it.

Refer to SERVO part.

Check the connection of MD.

AUDIO ABNORMAL

OPEN/CLOSE ABNORMAL

C. Video abnormal

Check Video jack.

YES (If OK)

Refer to Video part.

Refer to Encoder part.

Refer to MPEG part.

Replace B/D.

VIDEO ABNORMAL

3-5

E. Picture abnormal

Check the disc.

If OK

YES (If OK)

Refer to Servo part

Check MPEG_CLK Signal of MPEG part

Check DSP

Check MPEG

YES (If OK)

Replace B/D

PICTURE ABNORMAL

F. Disc Error

Check Disc

YES (If OK)

Refer to Servo part

Replace B/D

DISC ERROR

3-6

Power is on

Does Logo appear

on the screen?

Does the

moving picture of the DVD Disc

play on the screen

normally?

Is MPEG data signal normal?

Is error signal normal?

Is MPEG data signal normal?

Is Clock normal?

Does the audio

sound output from MPEG

decoder?

Does the

moving picture of the video

CD play on the screen

normally?

Does the audio sound

output normally?

END

Check power & clock.

Check CD/DVD DSP output

signal.

Check MPEG Decoder input

signal.

Check CD/DVD DSP output

signal.

Check MPEG Decoder input

signal.

Check CD/DVD DSP output

signal.

Check MPEG Decoder input

signal.

Check clock signal

YES

3. MPEG Circuit

_ OPTION

_ If included VCD function.

3-7

START

Does remote control

work normally?

Do all the

buttons work

normally?

Check waveform of

IC901 Pin 22.

Check waveform

of IC901 Pin 26, 27.

Is Digitron on normally?

LED ON?

Check waveform

of IC901 Pin 6.

Is oscillation of

X901 normal?

Is waveform of IC901

Pin 40 normal?

Check waveform

of IC901 Pin 22.

Does pulse

waveform of RC901 Pin 1

appear?

Is IC901

Pin 17 connected to

RC901 Pin 1 ?

Is RC901 Pin 2 5V?

Power on.

Check and replace R903,R912, R904, R905, R941, R906, R907.

Solder defective parts again.

Solder defective parts

Replace IC901.

Solder Key part.

Check Power.

Replace IC902.

Replace IC901.

Replace LED901.

Replace RC901.

Re-solder.

Recheck

Replace IC901.Complete repairing Front B/D.

NONONO

YES

YES YES

YES

YES YES

YES

4. Front Circuit (Digitron & key)

3-8

Does signal pulse

input to IC201 Pins 58, 59 when

the power is on?

Does signal goes

"High" to IC201 Pin194 when the

power is on?

Does

TTL pulse output to

IC201 Pins 140, 142?

Does

33.8688MHz clock input to IC201 Pin 63?

Is IC201

Pins 83, 84, 88, 89 voltage

about 2.2V?

Replace IC201

(IC206 soldering or IC defect).

Check power circuit.

Check "2.µ-COM Part".

Replace X301 or IC304

(30MHz clock defect)

CHECK POINT(General)

5. RF/Servo Circuit

END

NO NO

YES

YESYES

YES

3-9

Does tray open or close?

Does the pick-up

slide inner or outer

track?

Fig.1. SLED Driver waveform

Fig.2. Focus Driver waveform

Does

the voltage change

at PMD03 Pins 1, 3 more than

2V on the basis of

3.8V?

Pressing

the open/close key

repeatedly, check the voltage of IC2M1

Pins 22 change

0V to 5V

Does

PMD03 Pin 13 change

high to low?

Does

the pick-up lens move up

and down?

Check Focus Driver output.

(IC201 Pin 83, IC2M1 Pins 32, 33)

Check SLED Driver output.

IC201 Pin 88 IC2M1 Pins 35, 36.

IC201 Pin 88 no output : IC201 is defective IC2M1 Pin 19 no output : IC2M1 is defective

IC201 Pin 83 no output : IC201 is defective IC2M1 Pins 24, 41 no output : IC2M1 is defective

DECK assembly is defective.

Slide the pick-up to

inner track.

Power on

Check loading Part.

Push Pick-up to inner track to

the end by hand.

DECK assembly is defective.

(Limit sw)

check µ-COM Part.

Replace IC2M1.

No disc

END

YES

3-10

FOCUS ON?

Check

the focus error moving the

lens up and down.

(IC2A1 Pin 42)

Does the

TTL level change at IC201

Pin 78 and 132 moving

the lens?

Does the disc turn?

IC201 Pin169 is "High"?

Is OK the track jump.

Does the signal

pulse appear at IC2A1 Pins

39, 29?

Does the screen appear?

OPEN/CLOSE

Replace µ-COM or IC201.

Replace IC201.

Check IC2A1 Pin 11,12,13,14 in DVD Mode

Fig.3. FOCUS ERROR waveform

IC201 no output : Pick-up is defective.

Check IC201 and IC2M1 when PMD03 Pin 6 is abnormal

Check IC2M1 Pin 18, PMD03 Pin 6 turn when the IC2M1 Pin 21 is less than 2.2V.

Check A

Video Part is defective.

Check "5.MPEG Circuit."

Check "7.OSD/Video Circuit."

Replace µ-COM part.

IC2A1 is defective.

DISC IN

END

NO NO

YES

YES YES

YES

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