NAD C-541 Service manual

NAD

SER VICE MANUAL

C 541

COMPACT

DISC PLAYER

C 541

COMPACT

DISC PLAYER

2

SAFETY INFORMATION

CAUTION

CAUTION

- INVISIBLE LASER RADIATION WHEN OPEN AND

INTERLOCKS DEFEA TED. 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 DELÄR

ÖPPNAD OCH SPÄRRAR ÄR URKOPPLADE. STRÅLEN ÄR FARLIG.

VARO!

- AVATTAESSAJASUOJALUKITUS OHITETTAESSA OLET

ALTTIINANÄKTMÄTÖNTÄ LASERSÄTEILYLLE. ÄLÄ KAISO
SÄTEESEEN.

VORSICT!

- UNSICHTBARE LASERSTRAHLUNG TRITTAUS, WENN

DECKEL GEÖFFNET UND WENN SICHERHEITSVERRIEGELUNG
ÜBERBRÜCKT IST. NICHTDEM STRAHLAUSSETZEN.

THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES.
OPERATION IS SUBJECTTO 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;LKJGF;LKJGF;LKJFL;SJK

HGKLFH;L;HJMNMD

HGKJDHSGKJHGKLGDJH

VARO!

KBVNCLKNBCVLKNLKNVLKNCVNCLVK JK

HGKJDHSGKJHJBJKBKJBJKGS

VORSICT!

JHFKLJHJLDKLJLKDJLKFHJHSGKJHGSJK

HGKLFH;L;HHBHHJD

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

M507 *AH 5120-0052-0 FUSE T1.6A 250V 5X20MM
M512, M513 *AH 5120-0020-0 FU T1A250V UL/CSA 5X20
M514 *AH 5120-0026-0 FU T315MA L 250V UL/CSA
M507 *C 5120-0050-0 FUSE T1.6A 250V 5X20MM
M512, M513 *C 5120-0018-0 FU T1A 250V SEMKO/VDE
M514 *C 5120-0027-0 FU T315MAL 250V

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-14

SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15-16

IC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17-19

TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21-26

MECHANISM EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

MECHANISM EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

EXPLODED VIEW OF LASER CD11CA-G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

EXPLODED VIEW PARTS LIST OF LASER CD11CA-G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

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

4

SPECIFICATIONS

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

Decoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BURR-BROWN Delta Sigma 24bit

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) . . . . . . . . . . . . . . . . . . . . . . . 0.007%

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) . . . . . . . . . . . . . . ³102 dB, De-Emphasis on

³102 dB, De-Emphasis off

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

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

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

Output Impedance . . . . . . . . . . . . . . . . . . . . . . . . 200 ½

Output Level at 0 dB . . . . . . . . . . . . . . . . . . . . . . . 2.2 V rms

Digital Error Correction . . . . . . . . . . . . . . . . . . . . . CIRC with double error correction

in C1 and C2

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

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

REAR PANEL / FRONT PANEL

REAR PANEL

FRONT PANEL

1. LINE OUT

2. DIGITAL OUT

3. NAD LINK

4. 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 ( )

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.

5

4

3

1

2

7

6

6

7

BLOCK DIAGRAM

NAD LINK

M319

RCA JACK

NAD LINK

M501

VFL DISPLAY

REPEAT

KEYBOARD

OUT

IN

M111M112

M104

11

109

RANDOM

TIME

1312

U403

8

74HC00 NAND GATE

M106

M108

15

U402

MICRO-

NAD LINK

CONTROLLER

9

11

64

1 16

19 24

U401 LC866008

SYSTEM CONTROL CPU

& VFL DISPLAY DRIVER

57 58

O/P

J317

RCA

CD AUDIO

1

8

M113

SENSOR

REMOTE

39

40

33

34

35

36

47

41

4344 48

JACK

L

R

Q301-Q304

MUTE

Q401- Q403

MUTE CIRCUIT

M318

DIGITAL

OUTPUT

RCA JACK

U305

U306

L

R

16

13

DAC

U302

PCM1732

1

2

3

42

44

43

65

67

63

23

24

14

10 11

13

U301

LC78621

M303

EMC FILTER

3 6

U403

SIGNAL

DIGITAL

L301

DIGITAL COIL

74HC00

NAND GATE

PROCESSOR

2 4

56

M110 M109

-22V

M101 M103 M102

D510-D511

ZENER DIODES

-12V

U502-3,U506

U501,U507

+8V +5V +12V 5V

POWER

TRANSFORMER

DIODES

RECTIFIER

D506-D508

POWER

ANALOGUE

POWER

DIGITAL

M500

DIODES

RECTIFIER

D501-D504

DIODES

RECTIFIER

D514-D517

AC POWER I / P

TOFF

30 31

5 6

2 10

MOTOR

LOADING

TGL

CLV-

CLV+

35

34

39

U101 LA9240

ANALOG SIGNAL

PROCESSOR/SERVO

U701 LB1641

MOTOR DRIVER

MOTOR

SPINDLE

LIMIT SWITCH

LOADING MOTOR

40

EFM

4

4443

1

63 62

16

29

15

27

U201 LA6541

6

5

SLED

FOCUS &

TRACKING

MOTOR

11

10

MOTOR

13

28

3

18

DRIVER

21

26

20

25

PU-IN

LIMIT SWITCH

UP

PICK

Q101

CD MECHANISM UNIT

DISC

8

WIRING DIAGRAM

NAD

IN/OUT

TO CHASSIS

M120A

KEYBOARD

MAIN BOARD

M502

TRANSFORMER

RED

BROWN

M102 (15 PINS)

M105 (6 PINS)

M101 (5 PINS)

BLACK

M505B

M505A

CD MECHANISM

DISPLAY BOARD

NEUTRAL

LIVE

LIVE BOARD

9

RF PATTERN TESTING

NAD - C 541 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 R132 (Pin 41 of U101) and DGND (J334).

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

Testing

Point

J334

Testing Point

R132

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 surface 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 ojective 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

1M ohm

2.Conducttive Sheet
or Copper Plate