NAD C-525-BEE Service manual
NAD
SERVICE MANUAL
C 525BEE
C 525BEE
COMPACT
DISC PLAYER
COMPACT
DISC PLAYER
- 3 -
CAUTION
The lightning flash with arrowhead, within an equilateral tri-
angle i s intended t o alert the us er of the pr esence 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.
CA
TUION
H
G
K
JD
H
S
G
K
JH
G
S
JK
ADV
ARSEL
HG
KJ
D
H
SG
K
JH
G
S
K
BV
N
C
LK
NB
C
V
LK
N
LK
N
VL
K
NC
V
N
C
LV
K JK
ADV
ARSEL
H
G
K
LF
H
;L;H
JM
N
M
D
H
FK
LJH
JL
D
K
L
JLK
D
JL
K
F
H
JH
S
G
M
M
K
JH
G
S
JK
V
ARING
H
GKJD
HSG
KJHG
KLG
DJH
KLH
KFG;LKNG
;LKJGF;LKJG
F;LKJFL;
S
JK
V
ARO!
HG
KJD
HSGK
JH
JBJKB
KJBJKG
S
K
BVNCLKN
BCVLKNLKN
VLKNC
VNC
L
VK JK
VORSICT!
HG
KLFH
;L;H
HBHH
JD
JHFKLJH
JLDKLJLKD
JLKFHJHSG
KJHG
SJK
CLASS 1
LASER PRODUCT
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.
- OSYNLING LASERSTRÅLNING NÄR DENNA DEL ÄR
VARING
ÖPPNAD OCH SPÄRRAR ÄR URKOPPLADE. STRÅLEN ÄR FARLIG.
- AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET
VARO!
ALTTIINA NÄKTMÄTÖNTÄ LASERSÄTEILYLLE. ÄLÄ KAISO
SÄTEESEEN.
VORSICT!
- UNSICHTBARE LASERSTRAHLUNG TRITT AUS, WENN
DECKEL GEÖFFNET UND WENN SICHERHEITSVERRIEGELUNG
ÜBERBRÜCKT IST. NICHT DEM 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.
- 2 -
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 *CA 5120-0020+0 FU T1A 250V UL/CSA 5x20MM
M502-M504 *EU 5120-0018+0 FU T1A 250V SEMKO/UDE 5x20MM
M505 *CA 5120-0052+0 FUSE T1.6A 250V 5x20MM UL/CSA
M505 *EU 5120-0050+0 FUSE T1.6A 250V 5x20MM SEMKO/VDE
NOTE:
<*CA > : CANADIAN MODEL ONLY.
<*EU > : 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24-33
MECHANISM EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
MECHANISM EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37-38
PACKING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
- 3 -
- 5 -
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)
- 4 -
© 2006 NAD C525BEE
© 2006 NAD C525BEE
REAR PANEL / FRONT PANEL
REAR PANEL
1. LINE OUT
2. DIGITAL OUT
FRONT PANEL
1. POWER ON / OFF
2. DISC DRAWER
3. DISPLAY
4. OPEN
5. PLAY / PAUSE
6. TIME
3. AC LINE CORD
7. STOP
8. REPEAT
9. RANDOM
10. SCAN Back ( ) / Forward ( )
11. SKIP Back ( ) / Forward ( )
12. STANDBY LED
- 5 -
- 7 -
7
6
6
5
4
3
1
2
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.
- 6 -
BLOCK DIAGRAM
U401 M38223E4HP4
SYSTEM CONTROL CP
U
& LCD DISPLAY DRIVE
R
Q401- Q405
MUTE CIRCUIT
Q301-Q304
MUTE
M317
RCA
JACK
U302
PMC1710
M318
RCA JACK
DIGITAL
OUTPUT
M501*
LCD DISPLAY
8
7
27
22
2
1
3
51
78
35
1
2
16
13
3
61
62
63
51
43
39
40
46
45
38
24
12
9
2
4
3
6
60
L
R
L
R
CD AUDIO
O/P
12
15
28
16
18
6
1
U301
CXD3017Q
DIGITAL
SIGNAL
PROCESSOR
26
1
27
2
12
16
13
17
U101 CXA2581
ANALOG SIGNAL
PROCESSOR/SERVO
RFAC
RFDC
FE
SE
Q104~Q107
MOTOR DRIVER
U201 BA6392
FOCUS &
TRACKING
MOTOR
DRIVER
LOADING
MOTOR
LOADING MOTOR
LIMIT SWITCH
SPINDLE
MOTOR
SLED
MOTOR
PU-IN
LIMIT SWITCH
PICK
UP
DISC
M113
REMOTE
SENSOR
CD MECHANISM UNIT
POWER
TRANSFORMER
AC POWER I / P
KEYBOARD
M110
M109
REPEAT
M105
M108
M107
RANDOM
M102
M106
M104
M103
TIME
M101
Q101
DAC
U306
U305
11
U501,U507
DIGITAL
POWER
U502-3,U506
ANALOGUE
POWER
+8V
+5V
+12V
5V
-12V
D514-D517
RECTIFIER
DIODES
D501-D504
RECTIFIER
DIODES
D506
RECTIFIER
DIODES
U504
POWER FOR
EL LIGHT
M502
EL LIGHT
Q307,
Q309
Q312,
Q313
RL101
RELAY
U403
74HC00
NAND GATE
M303
EMC FILTER
L301
DIGITAL COIL
M500
1
- 7 -
- 9 -
WIRING DIAGRAM
115V:J401,J404
230V:J403
L401
J403
J406
J407
J402
J404
J401
1723- 006A+0000
8V0V0V
8V
15V
0V
15V
ISSUE B
M120C
M505B
M301
LIVE
NEUTRAL
M500A
M102
(16PIN)
M105
(6PIN)
M505A
CD MECHANISM
TRANSFORMER BOARD
DISPLAY BOARD
LED BOARD
KEY BOARD
LIVE BOARD
M101
(5PIN)
TO
CHASSIS
M805
BROWN
M803
BROWN
- 8 -
RF PATTERN TESTING
3T
4T
5T – 11T
NAD - C 525BEE 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
- 9 -
- 11 -
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
1M ohm
2.Conductive 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 objective lens (2 or 3 times) will take place.
- 10 -
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.
Protective soldering place
for laser diode
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
Soldering
Iron with
Ground
wire
Ground Line
Less than
10 ohm
Conductive Gum Mat
- 11 -
PCB LAYOUT
DISPLAY BOARD
KEY BOARD
LIVE BOARD
LED BOARD
- 12 -
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