NAD C-521-BEE Service manual
NAD
C 521BEE
COMPACT
DISC PLAYER
C 521BEE
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
D
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.
5
4
3
1
2
7
6
6
- 7 -
BLOCK DIAGRAM
O/P
M317
RCA
CD AUDIO
1
M113
SENSOR
REMOTE
JACK
L
R
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
22
SYSTEM CONTROL CPU
& LCD DISPLAY DRIVER
24 12
46
45
35
87 27
38
Q309
Q307,
RL101
RELAY
Q301-Q304
MUTE
Q401- Q405
MUTE CIRCUIT
9
2
12
U306
L
16
1
61
51
RFAC
15
R
13
DAC
U302
PMC1710
2
3
62
63
43
39
40
FE
SE
RFDC
28
16
18
U101 CXA2581
ANALOG SIGNAL
PROCESSOR/SERVO
U301
DIGITAL
CXD3017Q
11
6
1
M303
EMC FILTER
3 6
U403
SIGNAL
PROCESSOR
74HC00
NAND GATE
L301
DIGITAL COIL
2 4
60
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
LOADING MOTOR
MOTOR
SPINDLE
LIMIT SWITCH
CD MECHANISM UNIT
U201 BA6392
FOCUS &
27
26
SLED
MOTOR
TRACKING
MOTOR
DRIVER
2
1
PU-IN
LIMIT SWITCH
DISC
13
17
12
16
UP
PICK
- 8 -
WIRING DIAGRAM
TO CHASSIS
M120C
KEY BOARD
J401
230V:J403
115V:J401,J404
J402
8V0V0V
1723-006A-0000
M500A
8V
0V
15V
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
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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