NAD C-542 Mk2 Service manual
NAD
C 542
COMPACT
DISC PLAYER
C 542
COMPACT
DISC PLAYER
SERVICE MANUAL
- 2 -
SAFETY INFORMATION
CAUTION
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;LKJGF;LKJGF;LKJFL;SJK
HG
HGKLFH;L;HJMNMD
KJDHSGKJHGKLG
VARO!
HGKJD
KBVN
CLKNB
HSGKJHJBJKBKJBJKGS
CVLKNLKN
VORSICT!
JHFKLJHJLDKLJLKDJLKFHJHSGKJHGSJK
HGKLFH;L;H
DJH
VLKNC
VNCLVK JK
HBH
HJD
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
M507 *C 5120-0050-0 FUSE T1.6A 250V 5x20MM
M512, M513 *AH 5120-0020-0 FU T1A 250V UL/CSA 5x20MM
M512, M513 *C 5120-0018-0 FU T1A 250V SEMKO/VDE
M514 *AH 5120-0026-0 FU T315MA L 250V UL/CSA
M514 *C 5120-0027-0 FU T315MA L 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-13
SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-18
IC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19-22
TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24-29
MECHANISM EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
MECHANISM EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33-34
PACKING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
- 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) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.002%
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) . . . . . . . . . . . . . . . . . . . . . . . ≥100 dB, De-Emphasis on
≥100 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 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 -
DIGITAL
OPTICAL OUT
DIGITAL
OUT
TRIGGER SWITCH
OFF
AUTO
1. LINE OUT
2. DIGITAL OPTICAL & COAXIAL OUTPUT
3 NAD LINK IN / OUT
4. IR INPUT
5. TRIGGER IN
6. TRIGGER SWITCH
7. 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
DIGITAL
DIGITAL
OPTICAL OUT
OUT
' 2003 NAD C 542
NAD LINK
OUT
IN
IR IN
4
TRIGGER SWITCH
OFF
IN
5
AUTO
6
7
1151279
NA
D
' 2003 NAD C 542
Compact Disc Player
1
C 542
2
PLAY PAUSE
STOP
RANDOM
SEC
MIN
6 7 8
9
10
3
OPEN
REPEAT
TIME
468
SKIP
SCAN
10
- 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
KEYBOARD
RANDOM
OUT
IN
M108M107
M105
M110 M109
M313
IR_IN
M314
TRIGGER
REPEAT
TIME
SWITCH
M102
M101
M106 M104 M103
1312
11
U403
109
8
74HC00 NAND GATE
41 56
1 79 80 24
Q312
15
U402
MICRO-
NAD LINK
CONTROLLER
9
11
23
35 40
63
U301 M38B59EF
SYSTEM CONTROL CPU
& VFL DISPLAY DRIVER
65
18 67
19 69
59 70
60 80
32
AC POWER I / P
O/P
M313
RCA
CD AUDIO
8
M113
SENSOR
REMOTE
M315
Q307
TRIGGER IN
68 72 25
64
66 58 67
6222
JACK
L
R
Q301-Q304
MUTE
Q401- Q403
MUTE CIRCUIT
U305
U306
L
27
64
1
20
515940 41
FE
RFAC
151618
9
16
U302
SETE
R
13
DAC
PCM1732
1 3
4
6361
66
U201
43
RFDC
28
M316
DIGITAL
OPT JACK
DSP
LXD3017Q
292833
SRDR
426 27
OUTPUT
SFDR
FRDR
5
FFDR
9
M318
M303
EMC FILTER
3 6
U403
32
313026
TRDR
10
201924
DIGITAL
OUTPUT
RCA JACK
L301
74HC00
NAND GATE
TFDR
SPDR
DIGITAL COIL
2 4
60
27
12 13
15
16 17
Q101
PICK
UP
POWER
K502
F1 F2
RELAY
-22V
D510-D511
ZENER DIODES
-12V
U502-3,U506
U501,U507
+8V +5V +12V 5V
RECTIFIER
D506-D508
POWER
ANALOGUE
POWER
DIGITAL
M500
TRANSFORMER
DIODES
DIODES
RECTIFIER
D501-D504
DIODES
RECTIFIER
D514-D517
K501
RELAY
Q310
U101
25 12
CX2581
Q103
MOTOR
LOADING
RF AMP
1
27
DISW
DISCO
LIMIT SWITCH
LOADING MOTOR
2
SPINDLE
CD MECHANISM UNIT
11
6
MOTOR
1 2
SLED
MOTOR
U202
BA6392
PU-IN
LIMIT SWITCH
DISC
- 8 -
WIRING DIAGRAM
M120A
KEY BOARD
MAIN BOARD
M502
TRANSFORMER
RED
BROWN
M102
(16PIN)
M105A
(6PIN)
BLACK
M101
(5PIN)
CD MECHANISM
M301A
M505A
M506A
LED BOARD
DISPLAY BOARD
NEUTRAL
LIVE
LIVE BOARD
- 9 -
RF PATTERN TESTING
NAD - C 542 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
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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