NAD C300 User manual

NAD
SERVICE MANUAL
C 300
STEREO
AMPLIFIER
C 300 STEREO AMPLIFIER
December 2005

TABLEOFCONTENTS
DESCRIPTIONPAGE
REARPANEL/FRONTPANELVIEW ...3
SPECIFICATIONS .4-5
DISASSEMBLYINSTRUCTIONS ..6
ALIGNMENTPROCEDURE 7
PCB LAYOUT .8-9
SCHEMATICDIAGRAM ..10
WIRINGDIAGRAM .11
ICBLOCK DIAGRAM ....12
ELECTRICALPARTSLIST 13-16
EXPLODEDVIEW PARTSLIST ..17
EXPLODEDVIEW ..18
PACKINGDIAGRAM .19
_SERVICESAFETYPRECAUTIONS_
1. Replacing the fuses
CAUTION:FORCONTINUEDPROTECTIONAGAINSTTHERISKOFFIRE,REPLACEONLYWITH
DESIGNATEDTYPE OF FUSE FOR*AH, *B1, *BAND *C VERSIONS.
Reference NoPartNumber Description
F701 F702 20-00500-25 T5AL250VFuse
F703 F704 20-00050-25 T0.5AL250VFuse
NOTE:
<*AH>: USA, CANADIANMODELONLY.
<*B>: UKMODELONLY.
<*B1>: AUSTRALIANMODELONLY.
<*C>: EUROPEANMODELONLY.
2. Safetycheck out
(OnlyU.S.A. Model)
Beforereturning the product tothe customer, makeleakage current orresistancemeasurementsto
determine that exposed partsareacceptablyinsulated fromthe supplycircuit.
Partsmarked withthe symbol “
”arecriticalwithregardtothe riskoffireand electricshock.Replace
onlywithpartsrecommended bythe manufacturer.
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SPECIFICATIONS
POWERAMPLIFIERSECTION
STEREO MODE
CONTINUOUSAVERAGEPOWEROUTPUTINTO 8OHMS .25W
(Min. Powerperchannel, 20Hz-20kHz, bothchannelsdriven,
withno morethan rated distortion)
Rated impedance ..4-8ohms
Rated distortion (THD 20Hz-20kHz) ..0.03%
Clipping power(maximumcontinuouspowerperchannel) .. 30W
IHFdynamicheadroomat 8ohms .+2.4dB
IHFdynamicpower8ohms: ...43W
4ohms:...65W
2ohms:...90W
Damping factor(ref. 8ohms50Hz) ...>100
Peakundistorted O/Pcurrent (into0.1 0.5ohms, bothchannelsrunning) 40A
Frequency responseat 20Hz-20kHz(Tone Controlin) ...0±0.5dB
Frequency responseat 10Hz/70kHz .... ..-2dB
THD ..<0.03%
(TotalHarmonicDistortion, 20Hz-20kHz, from250mWtorated output)
SMPTEI.M....<0.03%
(IMdistortion, 60Hz+ 7kHz, 4:1, from250mWtorated output)
IHFI.M. (CCIFIMdistortion, 19+20kHzat rated output)and DIM100 <0.03%
PREAMPLIFIERSECTION
Line LevelInputs(Disc, CD, Video,Aux,Tuner,Tape 1,Tape 2)
Input impedance(Rand C) ...210kohms//320pF
Input sensitivity(ref. rated power) ....200mV
Maximuminput level .5Vrms
Signal/Noiseratio,A-weighted ...>100dBref.1W
>114dBref. rated power
MaximumOutputLevel(Tape 1&2) ...5Vrms
TONECONTROLS
Treble(at10kHz) ..±6dB
Bass (at 100Hz) ...±5dB
PHYSICALSPECIFICATION
Dimensionsinmm (Width Height Depth) ...435 95 325
Net weight ..5.0kg
Shipping Weight ....6.2kg
PowerConsumption(at 2 50W/4ohmsoutput)230V50Hz .185W

ＴＰ５ ＴＰ６
ＴＰ７ ＴＰ８
ＶＲ３０２
ＶＲ３０１
ＶＲ４０１
Ｄ３０５Ｄ４０５
ＶＲ４０２
ALIGNMENT PROCEDURE
A. OUTPUT OFFSET VOLTAGE
1.Push Power on, preheat unit for 5 minutes.
2.Connect the DC Millivoltmeter to L Channel speaker output terminals or TP5 and
TP7, adjust VR301 to get a reading of 0V±30mV.
3.Connect the DC Millivoltmeter to R Channel speaker output terminals or TP6 and
TP8, adjust VR401 to get a reading of 0V±30mV.
B. IDLING CURRENT
1.Connect the DC Millivoltmeter across D305, adjust VR302 for 160 -- 180mV reading
on meter.
2.Connect the DC Millivoltmeter across D405, adjust VR402 for 160 -- 180mV reading
on meter.
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ＲＣＨ－ＢＡＲ ＧＮＤ－ＢＡＲ
ＰＯＷＥＲ ＴＲＡＮＳＦＯＲＭＥＲ
ＣＢ７０４
ＨＥＡＤＰＨＯＮＥ
ＢＯＡＲＤ ＰＯＷＥＲ ＳＷＩＴＣＨ
ＢＯＡＲＤ
ＰＯＷＥＲ ＬＥＤ
ＢＯＡＲＤ ＤＩＳＰＬＡＹ ＢＯＡＲＤ
ＭＯＤＵＬＥ１ ＴＯ ＣＺ３０１ ＭＯＤＵＬＥ２ ＴＯ ＣＺ４０１
ＭＯＤＵＬＥ３ ＴＯ ＣＺ６１
ＣＢ５０１
ＣＢ１０２
ＭＡＩＮ ＢＯＡＲＤ
ＴＯＮＥ ＣＯＮＴＲＯＬ ＢＯＡＲＤ
ＲＥＤ（ＣＥ） ＢＬＵＥ（ＡＨ）
ＢＲＯＷＮ （ＣＥ） ＢＬＵＥ （ＣＥ）
ＰＲＥ－ＥＮＤ ＢＡＲ
ＰＯＷＥＲ ＢＯＡＲＤ
WIRING DIAGRAM
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ＢＬＵＥ（ＡＨ） ＷＨＩＴＥ（ＡＨ） ＢＬＡＣＫ（ＡＨ）
ＷＨＩＴＥ（ＡＨ）

RESISTORS
R717 07-90001-00T t= 90° Posistor
R813×2 07-05082-06 8R2 1/6W 5% Carbon Film Resistor
R1, R617, R618, R619, R620,
R815x2
07-05100-06 10 1/6W 5% Carbon Film Resistor
R615, R616, R814×2 07-05330-06 33 1/6W 5% Carbon Film Resistor
R809×2 07-05680-06 68 1/6W 5% Carbon Film Resistor
R808×2 07-05221-06 220 1/6W 5% Carbon Film Resistor
R810×2 07-05471-06 470 1/6W 5% Carbon Film Resistor
R611, R612 07-05102-06 1K 1/6W 5% Carbon Film Resistor
R613, R614, R812×2 07-05103-06 10K 1/6W 5% Carbon Film Resistor
R324, R424 07-05104-06 100K 1/6W 5% Carbon Film Resistor
R321, R421 07-05020-04 20.25W 5% Carbon Film Resistor
R319, R419 07-05220-04 22 0.25W 5% Carbon Film Resistor
R309, R316, R409, R416 07-05330-04 33 0.25W 5% Carbon Film Resistor
R313, R413 07-05680-04 68 0.25W 5% Carbon Film Resistor
R314, R414, R738, R744,
R745
07-05101-04 100 0.25W 5% Carbon Film Resistor
R310, R410 07-05221-04 220 0.25W 5% Carbon Film Resistor
R315, R415 07-05271-04 270 0.25W 5% Carbon Film Resistor
R305, R307, R312, R405,
R407, R412, R511, R512
07-05102-04 1K 0.25W 5% Carbon Film Resistor
R320, R322, R420, R422 07-05471-04 470 0.25W 5% Carbon Film Resistor
R504, R505, R506, R507,
R508, R509
07-05222-04 2K2 0.25W 5% Carbon Film Resistor
R711, R726, R728, R735 07-05332-04 3K3 0.25W 5% Carbon Film Resistor
R318, R418
R311, R411 07-05472-04 4K7 0.25W 5% Carbon Film Resistor
R704, R720 07-05682-04 6K8 0.25W 5% Carbon Film Resistor
R736, R737 07-05822-04 8K2 0.25W 5% Carbon Film Resistor
R302, R308, R402, R408,
R503, R510, R513, R514,
R515, R708, R709, R729,
R740
07-05103-04 10K 0.25W 5% Carbon Film Resistor
R304, R404, R721, R741 07-05223-04 22K 0.25W 5% Carbon Film Resistor
R703, R705, R706, R707,
R710, R712, R714, R715,
R716, R718, R719, R724,
R727
07-05333-04 33K 0.25W 5% Carbon Film Resistor
R702, R730 07-05563-04 56K 0.25W 5% Carbon Film Resistor
R328, R428 07-05104-04 100K 0.25W 5% Carbon Film Resistor
R701, R725 07-05224-04 220K 0.25W 5% Carbon Film Resistor
R323, R423 07-05684-04 680K 0.25W 5% Carbon Film Resistor
R102, R104, R106, R108,
R110, R112, R114, R116,
R202, R204, R206, R208,
R210, R212, R214, R216
07-05105-04 1M 0.25W 5% Carbon Film Resistor
R713 07-05005-50A 0.05 5W 5% Cerment Resistor
R327, R427 07-01911-10B 910 1W 1% Flame Proof Resistor
R326, R426 07-05033-20B 3R3 2W 5% Flame Proof Resistor
R329, R429 07-05221-20B 220 2W 5% Flame Proof Resistor
R306, R406 07-05102-20B 1K 2W 5% Flame Proof Resistor
R723 07-10561-02C 560 0.5W 10% Fusible Resistor
R805×2, R806×2 07-05680-06D 68 1/6W 5% Metal Film Resistor
R802×2 07-05101-06D 100 1/6W 5% Metal Film Resistor
R61, R62 07-05221-06D 220 1/6W 5% Metal Film Resistor
R65, R66 07-01391-06D 390 1/6W 1% Metal Film Resistor
R69, R610 07-01621-06D 620 1/6W 1% Metal Film Resistor
R67, R68 07-05102-06D 1K 1/6W 5% Metal Film Resistor
REF. NO. DESCRIPTIONPART NO.
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