NAD C-541 Service manual

4 (1)

SERVICE MANUAL

C 541 COMPACT DISC PLAYER

NAD

C 541

COMPACT

DISC PLAYER

SAFETY INFORMATION

CAUTION

CAUTION - INVISIBLE LASER RADIATION WHEN OPEN AND INTERLOCKS DEFEATED. AVOID EXPOSURE TO BEAM.

ADVARSEL - USYNLIG LASERSTRÅLING NÅR DEKSEL ÅPNES OG SIKKERHEDSLÅS BR YTES. 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 F ARLIG.

VARO! - AVATTAESSAJASUOJALUKITUS OHITETTAESSAOLET ALTTIINANÄKTMÄTÖNTÄ LASERSÄTEIL YLLE. ÄLÄ KAISO SÄTEESEEN.

VORSICT!- UNSICHTBARE LASERSTRAHLUNG TRITTAUS, WENN DECKEL GEÖFFNET UND WENN SICHERHEITSVERRIEGELUNG ÜBERBRÜCKT IST. NICHT DEM STRAHLAUSSETZEN.

CATUION
CATUION
ADVARSELHGKJDHSGKJHGSJK	VARING
ADVARSELKBVNCLKNBCVLKNLKNVLKNCVNCLVK	VARING
HGKJDHSGKJHGS	KLHKFG;LKNG;LKJGF;LKJGF;LKJFL;SJK
HFKLJHJLDKLJLKDJLKFHJHSGMMKJHGSJK	KLHKFG;LKNG;LKJGF;LKJGF;LKJFL;SJK
HGKLFH;L;HJMNMD	VARO!	HGKJDHSGKJHGKLGDJH
	KBVNCLKNBCVLKNLKNVLKNCVNCLVKVORSICT!HGKJDHSGKJHJBJKBKJBJKGS
	JHFKLJHJLDKLJLKDJLKFHJHSGKJHGSJK
		HGKLFH;L;HHBHHJD

CLASS 1

LASER PRODUCT

The lightning flash with arrowhead, within an equilateral tri-	The exclamation point within an equilateral triangle is intend-
angle is intended to alert the user of the presence of	ed to alert the user of the presence of important operating
uninsulated "dangerous voltage" within the product’s	and maintenance (servicing) instructions in the literature
enclosure; that may be of sufficient magnitude to consti-	accompanying the appliance.
tute a risk of electric shock to persons.

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.

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 T1A 250V 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

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)

REAR PANEL / FRONT PANEL

REAR PANEL

LINE OUT

3. NAD LINK

DIGITAL OUT

4. AC LINE CORD

FRONT PANEL













1.	POWER ON / OFF	7.	STOP
2.	DISC DRAWER	8.	REPEAT
3.	DISPLAY	9.	RANDOM
4.	OPEN	10.	SCAN Back (	) / Forward (	)
5.	PLAY / PAUSE	11.	SKIP Back (	) / Forward (		)
5.	PLAY / PAUSE	11.	SKIP Back (	) / Forward (		)
6.	TIME

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	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.

6	7

Figure No.2.

KEYBOARD

M501

M319

RCA JACK

REPEAT

VFL DISPLAY

NAD LINK

M110

M109

M104

M112

M111

OUT

-22V

-12V

D510-D511

TIME

RANDOM

+8V

+5V

+12V

M101

M103

M102

M108

M106

ZENER DIODES

U403

U501,U507

U502-3,U506

74HC00 NAND GATE

DIGITAL

ANALOGUE

12 13

POWER

D506-D508

RECTIFIER

POWER

DIODES

TRANSFORMER

D514-D517

D501-D504

U402

RECTIFIER

U401 LC866008

DIODES

NAD LINK

M500

SYSTEM CONTROL CPU

MICRO-

& VFL DISPLAY DRIVER

CONTROLLER

AC POWER I / P

M113

REMOTE

SENSOR

CD AUDIO

O/P

CD MECHANISM UNIT

Q401Q403

J317

Q301-Q304

MUTE CIRCUIT

MUTE

RCA

JACK

MOTOR

U306

TOFF

U305

LOADING MOTOR

U701 LB1641

MOTOR DRIVER

TGL

U302

LIMIT SWITCH

U101 LA9240

ANALOG SIGNAL

PCM1732

CLV-

DAC

PROCESSOR/SERVO

SPINDLE

MOTOR

CLV+

EFM

SLED

U201 LA6541

MOTOR

FOCUS &

U301

DISC

TRACKING

LC78621

MOTOR

M303

PU-IN

11 DRIVER

DIGITAL

EMC FILTER

LIMIT SWITCH

SIGNAL

U403

M318

PROCESSOR

74HC00

NAND GATE

RCA JACK

DIGITAL

PICK

L301

OUTPUT

Q101

DIGITAL COIL

DIAGRAM BLOCK

MAIN BOARD	TO CHASSIS	NAD
		IN/OUT

TRANSFORMER

M502

RED

BROWN

M102 (15 PINS)

M105 (6 PINS)

M101 (5 PINS)

BLACK

CD MECHANISM

NEUTRAL
	M505B	M120A
LIVE		KEYBOARD
DISPLAY BOARD	M505A

DIAGRAM WIRING

LIVE BOARD

RF PATTERN TESTING

Testing

Point

J334

Testing Point

R132

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
3T 4T 5T —	11T

FIG. 1 (C) Good eye pattern

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.

INCORRECT

CORRECT

1.Grounding band

1M ohm

2.Conducttive Sheet or Copper Plate

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.

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.

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