NAD T-571 Service manual

DRAFT DATE: 30 OCT, 2002

NAD

SERVICE MANUAL

T 571

DVD / VCD / CD

PLAYER

T 571

DVD / VCD / CD

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

200 to 240 V 100 to 130 V

*200 to 240 V

*100 to 130 V

Europe

Australia

Europe

Australia

Other terminals

Antenna earth

terminals

E 0.7m A peak

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 120 V, 60 Hz (T571AH)

AC 110~240 V, 50/60 Hz (T571C) Power consumtion 16 W Mass 5.7 kg(12.6 lbs) External dimensions 440 x 118 x 423 mm (W x H x D) Signal system NTSC (T571AH)

PAL (T571C) Laser (DVD) Semiconductor laser, wavelength 650 nm

(CD) 780 nm

Frequency range (audio) DVD : fs = 96 kHz 4 Hz - 44 kHz

fs = 48 kHz 4 Hz - 22 kHz

CD: 4 Hz - 20 kHz Signal-to-noise ratio (audio) More than 105dB (EIAJ) Audio dynamic range (audio) More than 100dB (EIAJ) Harmonic distortion(audio) 0.003% 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) (T571C ONLY) S-video outputs (Y)1.0V(p-p), 75Ω, negative sync.,Mini DIN 4-pin x 1

(Pb)/(Pr) 0.7V(p-p), 75Ω Audio output(digital audio) 0.5V(p-p), 75Ω, RCA jack X 1/SCART(TO TV) (T571C ONLY) Audio output(analog audio) 2.0Vrms (1kHz, 0dB), 330Ω, RCA jack (L, R) x 2/

SCART(TO TV) (T571C ONLY)

*Designs and specifications are subject to change without notice.

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)

Disc Tray

Tray Door

Front Panel

Stopper

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. Pull the front panel toward you while pressing 5 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

(L1)

(B)

(C)

Power Code

Power Circuit Board

Main Chassis

MA Ass'y Dpm1

Bracket Main

Jack Circuit Board

(F)

Main Circuit Board

(B)

(D)

(E)

(D)

(E)

(B)

Fig. 2-4

Fig. 2-5

1. Disassemble Main circuit board, Jack circuit board, Power circuit board and MD Ass'y DPM1.

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

2. Remove 10 screws (B).

3. Disassemble Main circuit board and Jack circuit

board from Bracket Main.

4. Unscrew 3 screws(C) at Bracket Main.

5. Disassemble Bracket Main from Main chassis.

6. Unscrew 4 screws(D) at MD Ass'y DPM1.

7. Turn the portion the direction of arrow to move

the Base Assembly Tray in front of you.

8. Release the other 3 screws(E).

9. Disassemble MD Ass'y DPM1 from Main chassis.

10. Unscrew 4 screws(F) at Power circuit.

11. Disassemble power circuit board from Main

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 6 screws (G), and remove the digitron circuit board.

(G)

2-4

EXPLODED VIEWS

1. Cabinet and Main Frame Section

465

250

462

300

465

260

465

A46

A47

463

275

463

467

A48

463

A00

A43

280

285

262

452

DIG901

PBTOO

283

BCD

2-5

2.Packing Accessory Section

BATTERY

808

PACKING SHEET

804

PACKING

OPTIONAL PARTS

803

811

812

OWNER'S MANUAL

810

CABLE SET ASS'Y

801

REMOCON

900

BOX CARTON

802

PACKING

803

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..............................................................................................3-13

3. RF/CD DSP/DVD DSP/DVD servo Block Diagram ..............................................................3-14

4. Audio Block Diagram ............................................................................................................3-15

5. MPEG Block Diagram ...........................................................................................................3-16

CIRCUIT DIAGRAMS................................................................................................................3-17

1. Power (SMPS) Circuit Diagram ............................................................................................3-17

2. DVD DSP Circuit Diagram.....................................................................................................3-19

3. Drive & RF Circuit Diagram ..................................................................................................3-21

4. MPEG Circuit Diagram ..........................................................................................................3-23

• WAVEFORMS ...........................................................................................................................3-25

5. Audio DM & 5.1CH Circuit Diagram.....................................................................................3-27

6. TIMER & Key Circuit Diagram ..............................................................................................3-29

7. A/V Circuit Diagram...............................................................................................................3-31

8. A/V Jack Circuit Diagram......................................................................................................3-33

9. SCART Circuit Diagram.........................................................................................................3-35

• CIRCUIT VOLTAGE CHART.........................................................................................................3-37

PRINTED CIRCUIT DIAGRAMS............................................................................................3-41

1. MAIN P.C.BOARD...................................................................................................................3-41

2. AV JACK P.C.BOARD........................................................................................................... ..3-43

3. SMPS P.C.BOARD..................................................................................................................3-44

4. FRONT P.C.BOARD ................................................................................................................3-43

3-2

ELECTRICAL TROUBLESHOOTING GUIDE

No 5V_D or 5V_A .

No 5.2VA.

Is 5.2VA section working? (Is the POWER CTL at Pin6 High/low?)

Is oscillation present at the Base of Q108?

Replace Q108.

Check D109, C123, R125, R124.

Replace R102.

Replace BD101.

(Bridge rectifier)

Is R102(R104) normal?

Is about AC 100V app;ied to

IC101 Pin 3.

Check IC101.

Is 5.2V applied to IC102 Pin 1?

Is there a DC voltage at the

(+) terminal of BD101?

Check R127, 128.

(SHUTDOWN CKT)

1. Power(SMPS) Circuit

No FLD

Is 5.2VA section working?

Replace SMPS trans(T101).

Replace the inferior components.

Are D109, L103 open?

YES

A. B.

3-3

Replace Main B/D

Refer to Front Part

Replace IC502

Reconnect it.

2. µ-COM Circuit

A. No Power

Does Logo appear

on the screen?

Is oscillation of

X501 normal?

Are IC501 Pins 193, 808

and 81 normal?

Do “Hello” appear at FLD?

Is P3901

connected normally?

Is P3901 Pin 8, 9, 18 normal?

The waveform

on 3, 5, 7 pin of IC502

normal?

Check the oscillation

Check short.

Replace IC501

or IC306.

Check power.

(Refer to power)

If power is normal

POWER ON

YES

NONO

YES

3-4

B. Audio abnormal

D. Open/Close abnormal

Check the

connection of P3901.

Check IC301 Pins 93, 94.

Check Audio jack.

YES (If OK)

YES

(If OK)

YES

(If OK)

YES (If OK)

Refer to Audio part.

Refer to Decoder part.

Refer to PANTERApart.

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 PANTERApart.

Replace B/D.

VIDEO ABNORMAL

3-5

E. Picture abnormal

Check the disc.

If OK

YES (If OK)

Refer to Servo part

Check DSP

Check PANTERA

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 TOSHIBA Logo appear

on the screen?

Does the

moving picture of the DVD Disc

play on the screen

normally?

Is PANTERA

data signal normal?

Is error signal normal?

Is PANTERAdata

signal normal?

Is Clock normal?

Does the audio

sound output from PANTERA

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 CD/DVD DSP output

signal.

Check CD/DVD DSP output

signal.

Check clock signal

YES

3. PANTERA 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 21, 22.

Check waveform

of IC901 Pin 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 R926, R925.

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.PANTERAPart".

Replace X201 or IC206

(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 15, 16 more than

2V on the basis of

3.8V?

Pressing

the open/close key

repeatedly, check the voltage of IC2M1

Pins 13, 14 change

0V to 5V

Does

PMD03 Pin 6 change

high to low?

Does

the pick-up lens move up

and down?

Check Focus Driver output.

(IC201 Pin 83, IC2M1 Pins 37, 38)

Check SLED Driver output.

IC201 Pin 88 IC2M1 Pins 28, 29.

IC201 Pin 88 no output : IC201 is defective IC2M1 Pins 28, 29 no output : IC2M1 is defective

IC201 Pin 83 no output : IC201 is defective IC2M1 Pins 37,38 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 PANTERAPart.

Replace IC2M1.

No disc

END

YES

+ 44 hidden pages

NAD T-571 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual