NAD Original instructions User manual

S 300
SERVICE MANUAL
Draft 2004 August

CONTENTS
FRONT PANEL / REAR PANEL VIEW................................... 3
SPECIFICATIONS................................................... 4
EXPLODED VIEW.................................................. 29
EXPLODED VIEW PARTS LIST ....................................... 30
PACKING DIAGRAM................................................ 31
ALIGNMENT PROCEDURE / ALIGNMENT POINTS........................ 5
WIRING DIAGRAM.................................................. 6
PCB LAYOUT ................................................... 7-12
SCHEMATIC DIAGRAM............................................13-21
IC BLOCK DIAGRAM................................................22
ELECTRICAL PARTS LIST .........................................23-28
SERVICE SAFETY PRECAUTIONS
1. ReplacingtheFuses
2. Safety-checkout (NorthAmericanmodelonly)
CAUTION:
NOTE:
FOR CONTINUED PROTECTIONAGAINST THE RISK OF FIRE REPLACE ONLY
WITHSAMETYPEOFFUSE.
Parts marked with the symbol are critical with regard to the risk of fire and electric shock.
Replaceonlywithpartsrecommendedbythemanufacturer.
Beforereturningtheproducttothecustomer, makeleakagecurrent orresistancemeasurements
todeterminethatexposedpartsareacceptablyinsulatedfromthesupplycircuit.
REFERENCENO. PARTNUMBER DESCRIPTION
F1*AH 5100-2510-1C Fuse 250mA250VTimeLagUL/CSA
F2*AH 5120-0061-0 Fuse12A250VTimeLag6.3x32mm UL/CSA
F1*C 5120-0035-0 Fuse100mA250VTimeLagLBCVDE/SEMKO
F2*C 5120-0025-0 Fuse6.3A250VTimeLagHBCVDE/SEMKO
*AH:NorthAmericanmodelonly
*C :Europeanmodelonly
!
2

The graphic symbol of a lightning flash with an arrow point
within a triangle signifies that there is dangerous voltage
within the unit and it posses a hazard to anyone removing
the cover to gain access to the interior of the unit. Only
qualified service personnel should make such attempt.
The graphic symbol of an exclamation point within
an equilateral triangle warns a user of the device
that it is necessary to refer to the instruction
manual and its warnings for proper operation of
the unit.
REAR PANEL CONNECTIONS
FRONT PANEL CONTROLS
1. POWER SWITCH 4. VOLUME CONTROL 7. TAPE MONITOR INDICATOR
2. INFRA-RED RECEIVER 5. INPUT SELECTOR 8. INFRA-RED INDICATOR
3. TAPE MONITOR 6. INPUT INDICATOR 9. POWER INDICATOR
1. RIGHT BALANCED CD INPUT 6. LEFT TAPE INPUT/OUTPUT 11. AC INLET
2. RIGHT VIDEO INPUT 7. LEFT TUNER INPUT 12. LEFT SPEAKER OUTPUT
3. RIGHTAUX INPUT 8. LEFTAUX INPUT 13. GROUND TERMINAL
4. RIGHT TUNER INPUT 9. LEFT VIDEO INPUT 14. RIGHT SPEAKER OUTPUT
5. RIGHT TAPE INPUT/OUTPUT 10. LEFT BALANCED CD INPUT 15. NAD LINK INPUT/OUTPUT
FRONT PANEL / REAR PANEL VIEW
12
34567
8910
11
12
131415
Dual Mono Integrated Amplifier S300
NA D
TAPE MONITOR TUNERIR CDAUX VIDEO
12
345
6
7
8
9
3

Measured in accordance with EIA Standard RS-490 (IHF-A-202) 1978.
Physical specifications
Continuous average power output at 8 100W (20dBW)
Input impedance Single ended 10K
Balanced 20K
Sensitivity 350mV
Signal-to-Noise ratio (A-weighted) ref. 1W 88dB
Frequency response 20Hz - 20kHz +/-0.1dB
-3dB
Gain tracking error +/-0.1 at maximum
+/-3dB at -60dB level
Damping factor >110
Dimensions (WxHxD) 450x160 x400mm
Net weight 25.5 kg / 56.1 lbs
W
W
W
(Minimum power per channel, 20Hz-20kHz,
both channels driven, with no more than rated distortion)
(for rated power into 8 )
(ref. 8 , 50 Hz)
W
W
DC - 250kHz
SPECIFICATIONS
4

ALIGNMENT PROCEDURE
IDLE CURRENT ALIGNMENT (no load, no signal)
1. Connect a digital millivoltmeter between TP301 and TP303, and adjust P501 to
obtain a reading of between 30mV and 35mV.
2. Transfer the digital millivoltmeter to TP302 and TP304 and adjust P502 to obtain a
reading of between 30mV and 35mV.
3. Leave power on for at least 5 minutes to allow the idle currents to stabilize.
Re-adjust P501 and P502 as necessary to obtain a reading of between 30mV to
35mV on each channel.
ADJUSTMENT POINTS
TP303
TP301
P501
ALIGNMENT
TOOL
TP304
TP302
P502 ALIGNMENT
TOOL
LEFT POWER AMP PCB RIGHT POWER AMP PCB
5

WIRING DIAGRAM
NL
JK203
RED
WHITE
BLACK
BLACK
JK205
RED
BLACK
JK207
RED
BLACK
JK209
RED
BLACK
JK212 JK210 JK208 JK206 JK204
RED
RED
RED
RED
RED
BLUE
BLACK
BLACK
BLACK
BLACK
BLACK
BLACK
JK211
RED
BLACK
GRAY
BLACK
BLACK
(X6) BLACK
(X6)
J402
J403
J404
1
1
GROUND TERMINAL
AC INLET
TRANSFORMER - LEFT TRANSFORMER - RIGHT
POWER SWITCH
- LEFT +
SPEAKER
TERMINALS
+ RIGHT -
SPEAKER
TERMINALS
J532
J531
J313 J314
J327
+50V +50V
-50V
SPK
SPK
GND L
GND R
J328
-50V
J318
J317 J518
J517
J316
J315 J516
J515 J320
J319 J520
J519 J326
J325 J526
J525 J324
J323 J524
J523
J322
J321 J522
J521
J307
YEL/GRN
YEL/GRN
J302
J301
ORANGE
ORANGE
WHITE
WHITE
WHITE
WHITE
BLUE
BLUE
BLUE
BLUE
RED
RED
RED
RED
RED
BLACK
BLACK
BLACK
BLACK
BLACK
BROWN
BROWN
RED
BLACK
BROWN
BROWN J304
J303
GRAY
GRAY J310
J309
ORANGE
ORANGE
J308
J36
J36
J21 J22 J11 J12
J46
J46
J55
J55
J54
J54
J53
J53
J52
J52
J51
J51
J35
J35
J45
J45
J34
J34
J44
J44
J33
J33
J43
J43
J32
J32
J42
J42
J31
J31
J41
J41
RED
RED
WHITE
WHITE
PRIMARY - 120V VERSION
PRIMARY - 120V VERSION
PRIMARY - 230V VERSION PRIMARY - 230V VERSION
J401 1
2
25
26
J7
J102
1
2
1
2
25
26
25
26
MAIN BOARD
NAD LINK BOARD
LEFT POWER
AMP BOARD
RIGHT POWER
AMP BOARD
POWER SUPPLY BOARD
FRONT PANEL BOARD
BLUE
BLUE WHITE
WHITE
6