NAD C-521-BEE Service manual

NAD

C 521BEE

COMPACT

DISC PLAYER

C 521BEE

COMPACT

DISC PLAYER

SERVICE MANUAL

- 2 -

SAFETY INFORMATION

CAUTION

- INVISIBLE LASER RADIATION WHEN OPEN AND

INTERLOCKS DEFEATED. AVOID EXPOSURE TO BEAM.

ADVARSEL

- USYNLIG LASERSTRÅLING NÅR DEKSEL ÅPNES OG

SIKKERHEDSLÅS BRYTES. UNNGÅ EKSPONERING FOR STRÅLEN.

ADVARSEL

- USYNLIG LASERSTRÅLING VED ÅBNING, NÅR

SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION. UNDGÅ UDSÆTTELSE FOR STRÅLING.

VARING

- OSYNLING LASERSTRÅLNING NÄR DENNA DEL ÄR

ÖPPNAD OCH SPÄRRAR ÄR URKOPPLADE. STRÅLEN ÄR FARLIG.

VARO!

- AVATTAESSAJA SUOJALUKITUS OHITETTAESSA OLET

ALTTIINANÄKTMÄTÖNTÄ LASERSÄTEILYLLE. ÄLÄ KAISO SÄTEESEEN.

VORSICT!

- UNSICHTBARE LASERSTRAHLUNG TRITT AUS, WENN

DECKEL GEÖFFNET UND WENN SICHERHEITSVERRIEGELUNG ÜBERBRÜCKT IST. NICHTDEM STRAHL AUSSETZEN.

THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS:(1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND (2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED,

INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION.

CATUION ADVARSEL

KBVNCLKNBCVLKNLKNVLKNCVNCLVK JK

ADVARSEL

HFKLJHJLDKLJLKDJLKFHJHSGMMKJHGSJK

HGKJDHSGKJHGSJK

HGKJDHSGKJHGS

VARING

KLHKFG;LKNG

HGK

;LKJGF;LKJGF;LKJFL;SJK

VARO!

HGKJDHSGKJHJBJKBKJBJKGS

KBVNCLKNBCVLKNLKNVLKNCVNC

VORSICT!

JHFKLJHJLDKLJLKDJLKFHJHSGKJHG

JDHSGKJHGKLGDJH

HGKLFH;L;HHBHHJD

LVK JK

SJK

HGKLFH;L;HJMNM

CLASS 1

LASER PRODUCT

The lightning flash with arrowhead, within an equilateral tri-

angle is intended to alert the user of the presence of

uninsulated "dangerous voltage" within the product’s

enclosure; that may be of sufficient magnitude to consti-

tute a risk of electric shock to persons.

The exclamation point within an equilateral triangle is intend-

ed to alert the user of the presence of important operating

and maintenance (servicing) instructions in the literature

accompanying the appliance.

- 3 -

SERVICE SAFETY PRECAUTIONS

1. Replacing the fuses

CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE

OF FUSE.

Reference No Part Number Description

M502-M504 *AH 5120-0020-0 FU T1A 250V UL/CSA 5x20MM M502-M504 *C 5120-0018-0 FU T1A 250V SEMKO/UDE 5x20MM M505 *AH 5120-0052-0 FUSE T1.6A 250V 5x20MM UL/CSA M505 *C 5120-0050-0 FUSE T1.6A 250V 5x20MM SEMKO/VDE

NOTE:

<*AH > : USA, CANADIAN MODEL ONLY. <*C > : EUROPEAN MODEL ONLY.

2. Safety check out

(Only U.S.A. model) Before returning the product to the customer, make leakage current or resistance measurements to determine that

exposed parts are acceptably insulated from the supply circuit.

Parts marked with the symbol are critical with regard to the risk of fire and electric shock. Replace only with parts recommended by the manufacturer.

CONTENTS

DESCRIPTION PAGE

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

REAR PANEL / FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

DISASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

RF PATTERN TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

IMPORTANT NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-11

PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-13

SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-17

IC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-21

TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23-27

MECHANISM EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

MECHANISM EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31-33

PACKING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

- 4 -

SPECIFICATIONS

Disc Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . One Disc, 120 or 80 mm

Decoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BURR-BROWN Delta Sigma 20bit

Digital Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Times oversample

Analog Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 pole active

Frequency Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +/- 0.5 dB, 5Hz - 20kHz

De-Emphasis Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +/- 0.3 dB

THD (at 0 dB, 1kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.003%

Intermodulation Distortion . . . . . . . . . . . . . . . . . . . . . . . . . . . < - 100 dB

(19 + 20 kHz)

Dynamic Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 dB

Linearity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +/- 0.5 dB, 0 dB to -80 dB

Signal / Noise Ratio (A-Weight) . . . . . . . . . . . . . . . . . . . . . . . ≥106 dB, De-Emphasis on

≥106 dB, De-Emphasis off

Channel Separation 1kHz . . . . . . . . . . . . . . . . . . . . . . . . . . >90 dB

10 kHz . . . . . . . . . . . . . . . . . . . . . . . . >80 dB

Wow and Flutter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unmeasurable (Quartz Crystal Accuracy)

Output Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 Ω

Output Level at 0 dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.1 V rms

Digital Error Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IRC with double error correction in C1 and C2

Digital Code Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sony / Philips Serial data format

Power Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12W

CONTROLS

Play / Pause, Stop, Random, Skip (< >), Scan (< >), Open, Time, Repeat.

PHYSICAL SPECIFICATIONS

Dimensions 435 x 80 x 285 mm (Width x Height x Depth)

Net weight 4 kg (8.8 lbs)

Shipping weight 5.1 kg (11.22 lbs)

- 5 -

1. LINE OUT

2. DIGITAL OUT

3. AC LINE CORD

1. POWER ON / OFF

2. DISC DRAWER

3. DISPLAY

4. OPEN

5. PLAY / PAUSE

6. TIME

7. STOP

8. REPEAT

9. RANDOM

10. SCAN Back ( ) / Forward ( )

11. SKIP Back ( ) / Forward ( )

12. STANDBY LED

REAR PANEL / FRONT PANEL

REAR PANEL

FRONT PANEL

- 6 -

DISASSEMBLY INSTRUCTIONS

1. Remove machine screws M 4.0 x 6.0 ( 1 to 4 ) from the side panels.

Remove tapping screw 3.0 x 8.5 ( 5 )from the back panel.

Refer to Figure No.1.

Figure No.1

2. Pull both sides of the TOP COVER slightly outwards 6 and tilt approx. 35˚ and then remove

in the direction as indicated by the arrow 7 . Refer to Figure No.2.

Figure No.2.

- 7 -

BLOCK DIAGRAM

O/P

M317

RCA

CD AUDIO

M113

SENSOR

REMOTE

JACK

U305

M318

DIGITAL

RCA JACK

OUTPUT

M501*

LCD DISPLAY

KEYBOARD

RANDOM

M108M107

M105

M110 M109

M102

M101

REPEAT

TIME

M106 M104 M103

POWER

TRANSFORMER

51 78

U401 M38223E4HP4

1 3

AC POWER I / P

M500

SYSTEM CONTROL CPU

& LCD DISPLAY DRIVER

24 12

87 27

Q309

Q307,

RL101

RELAY

Q301-Q304

MUTE

Q401- Q405

MUTE CIRCUIT

U306

RFAC

DAC

U302

PMC1710

RFDC

U101 CXA2581

ANALOG SIGNAL

PROCESSOR/SERVO

U301

DIGITAL

CXD3017Q

M303

EMC FILTER

3 6

U403

SIGNAL

PROCESSOR

74HC00

NAND GATE

L301

DIGITAL COIL

2 4

Q101

-12V

+8V +5V +12V 5V

POWER

ANALOGUE

U502-3,U506

POWER

DIGITAL

U501,U507

DIODES

RECTIFIER

D501-D504

DIODES

RECTIFIER

D514-D517

D506

DIODES

RECTIFIER

U504

EL LIGHT

POWER FOR

Q313

Q312,

M502

EL LIGHT

Q104~Q107

MOTOR DRIVER

MOTOR

LOADING MOTOR

MOTOR

SPINDLE

LIMIT SWITCH

CD MECHANISM UNIT

U201 BA6392

FOCUS &

SLED

MOTOR

TRACKING

MOTOR

DRIVER

PU-IN

LIMIT SWITCH

DISC

PICK

- 8 -

WIRING DIAGRAM

TO CHASSIS

M120C

KEY BOARD

J401

230V:J403 115V:J401,J404

J402

8V0V0V

1723-006A-0000

M500A

15V

ISSUE B

M102

(16PIN)

M105

(6PIN)

M101

(5PIN)

M301

CD MECHANISM

LED BOARD

M505A

M505B

DISPLAY BOARD

LIVE BOARD

L401

J407

TRANSFORMER BOARD

J403

J404

LIVE

NEUTRAL

M803

J406

BROWN

M805

BROWN

- 9 -

RF PATTERN TESTING

NAD - C 521BEE PCB TESTING POINTS DIAGRAM

TESTING PROCEDURE (1) Load the test disc (Sony Test CD YEDS-7) and set the unit into PLAY mode. (2) Connect the scope to R227 (Pin 15 of U101) and DGND (J144).

Scope setting: Coupling : AC.

Vertical sensitivity : 0.2 V/ div. Horizontal time base : 0.5 µS/div.

(3) Observe the waveform is 2.0V p-p +/-5% and the eye pattern is at its best shape (see FIG. 1).

FIG. 1 (a) FIG. 1 (b) Poor eye pattern

FIG. 1 (C) Good eye pattern

3T 4T 5T — 11T

- 10 -

IMPORTANT NOTES

INSTRUCTION FOR HANDLING OPTICAL SYSTEM BLOCK PICK-UP

Electrostatic breakdown of the laser diode in the optical system block may occur due to a potential difference caused by electrostatic charge accumulated on clothing, human body, etc. A ground must be provided as follows to prevent any electrostatic charge during unpacking or repair work.

1. Ground for Human Body Be sure to wear a ground band (1M ohm) that is properly to remove any static electricity that may be charged on the

body.

2. Ground for Work Bench Be sure to place a conductive sheet (1M ohm) or copper plate with proper grounding on the work bench or other sur-

face on which the pick-up is to be placed.

3. Because the static electricity charge on the clothing does not discharge through the body grounding band, do not let clothing to get in contact with the pick-up unit.

PRECAUTIONS FOR CHECKING BEAM EMISSION

The laser beam of this unit is focused on the reflecting surface of the objective lens in the optical system block. Therefore, keep your eyes at least 12 inches (30 cm) away from the objective lens when the laser diode is ON. (Operation Check Method for Laser Diode and Focus Search Function.) When the POWER switch is turned ON after the chucking plate is removed, observe the objective lens and confirm that the following operations are performed properly. (The optical system should be at the lead-in area position when it is checked at this time.) (1) The laser should be at the innermost position after the chucking plate is removed. (2) The diffused light of the laser beam can be seen when the POWER switch is turned ON. (3) Vertical (up and down) movement of the objective lens (2 or 3 times) will take place.

INCORRECT CORRECT

NOTE: Laser diodes are so susceptible to damage from

static electricity that even if a static discharge does not ruin the diode, it can shorten its life or cause it to work improperly.

1.Grounding band

1M ohm

2.Conductive Sheet or Copper Plate

- 11 -

PRECAUTIONS WHEN CHANGING LASER PICK-UP

When removing the pick-up assembly, short circuit the PCB tracks on the optical block as show in the drawing in order to protect the pick-up before removal.

NOTE: Replacement pick-up assemblies are supplied with the PCB pattern already protected.

DO NOT REMOVE THE SHORT CIRCUITS UNTIL YOU HAVE FINISHED FITTING THE PICK-UP.

Caution:

Laser diodes are extremely susceptible to damage from static electricity. Even if a static discharge does not ruin the diode, it can shorten its life or cause it to work improperly. When replacing the pick-up, use a conductive mat, a grounded soldering iron, and so on, to protect the laser diode from static damage.

Ground Conductive Wrist Band for Body

Ground Line Less than 10 ohm

Conductive Gum Mat

Soldering Iron with Ground wire

Protective soldering place for laser diode

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