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  9. Technics SA-DX950 User manual

Technics SA-DX950 User manual

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OrderNo. MD0102029C1
A2
AVControl StereoReceiver
SA-DX950
Color
(K)... Black Type
P... U.S.A.
PC... Canada
SPECIFICATIONS
FMTunerSection
Frequencyrange 87.9-107.9MHz
Sensitivity 11.2dBf(2V, IHF’58)
50 dBquieting sensitivity
MONO 18.3dBf(4.5V, IHF’58)
STEREO 38.3dBf(45 V, IHF’58)
Total harmonicdistortion
MONO 0.2%
STEREO 0.3%
S/N
MONO 73 dB
STEREO 67 dB
Frequencyresponse 20 Hz-15 kHz, +1 dB, -2dB
Alternatechannel selectivity 65 dB
Captureratio 1.5dB
Imagerejection at98 MHz 40 dB
Spuriousresponse rejection at98 MHz 75 dB
AMsuppression 50 dB
Stereo separation
1kHz 40 dB
1
10 kHz 30 dB
Antennaterminal 75 (unbalanced)
AMTunerSection
Frequencyrange 530-1710 kHz
Sensitivity 20 V, 330 V/m
Selectivity 55 dB
IF rejection (at1000 kHz) 50 dB
Video Section
Outputvoltageat1Vinput
(unbalanced) 1±0.1Vp-p
Maximuminputvoltage 1.5Vp-p
Input/outputimpedance 75
AmplifierSection
Rated minimumsinewaveRMSpoweroutput
40 Hz-20 kHzboth channelsdriven
0.9%total harmonicdistortion 100 W perchannel (6 )
1kHzcontinuouspoweroutputboth channelsdriven
0.05%total harmonicdistortion 105 W perchannel (6 )
Total harmonicdistortion
rated powerat40 Hz-20 kHz 0.9%(6 )
halfpowerat1kHz 0.07%(6 )
Powerbandwidth
both channelsdriven, -3dB 10 Hz-70 kHz(6 , 0.9%)
Poweroutputat1kHzeach channel driven
0.9%total harmonicdistortion
Front 2x100 W (6 )
Center 100 W (6 )
Surround 2x100 W (6 )
Lowfrequencydamping factor 30 (6 )
Load impedance
Front
AorB 4-8
Aand B 8
Center 6-8
Surround 6-8
Dynamicheadroom 2dB(6 )
Frequencyresponse
PHONO RIAA standard curve±0.8dB
CD, TAPE, DVD, TV, VCR 10 Hz-70 kHz, ±3dB
Inputsensitivity
PHONO 0.4mV(3mV, IHF’66)
CD, TAPE, DVD, TV, VCR 27 mV(200 mV, IHF’66)
S/N(IHF A)
PHONO 70 dB
CD, TAPE, DVD, TV, VCR 78 dB
DVD6CH 100 dB(IHF A, Rated Power,
S=2 V), 85 dB(94 dB, IHF’66)
Inputimpedance
PHONO 47 k
2
PHONO
47
k
CD, TAPE, DVD, TV, VCR 22 k
Tonecontrols
BASS 50 Hz, +10 to -10 dB
TREBLE 20 kHz, +10 to -10 dB
Subwooferfrequencyresponse (-6dB) 7-200 Hz
Digital input
Optical 2
Coaxicial 1
General
Powersupply AC120 V, 60 Hz
Powerconsumption 410 VA320 W
Dimensions(W xHxD) 430 x158 x375 mm
(16-15/16”x6-7/32”x14-25/32”)
Mass 9.1kg (20.1lb.)
Powerconsumption in standbymode: 1 W
Notes:
1. Specificationsaresubjectto changewithout notice. / Mass and
dimensionsareapproximate.
2. Total harmonicdistortion ismeasuredbythedigital spectrum analyzer.
*Manufactured underlicense fromDolbyLaboratories. “Dolby”,
“Pro Logic”and thedouble-Dsimbol aretrademarks ofDolby
Laboratories.
** Manufactured underlicense fromDigital TheaterSystem. “DTS”
and “DTSDigital Surround”aretrademarks ofDigital Theater
Syatem.
1. SafetyPrecaution
(This“SafetyPrecaution”isappliedonlyinU.S.A.)
1. Beforeservicing, unplug thepowercordtopreventanelectric
shock.
2. Whenreplacing parts, use onlymanufacturer’srecommended
components forsafety.
3. Check thecondition ofthepowercord. Replace ifwearordamage
isevident.
4. Afterservicing, besuretorestoretheleaddress, insulation
3
barriers, insulation papers, shields, etc.
5. Beforereturning theservicedequipmenttothecustomer, besure
tomake thefollowing insulation resistance test topreventthe
customerfrombeing exposedtoashock hazard.
-Insulation Resistance Test
1. Unplug thepowercordand shortthetwoprongsoftheplug witha
jumperwire.
2. Turnon thepowerswitch.
3. Measuretheresistance valuewithohmmeterbetweenthejumper
ACplug and eachexposedmetal cabinet part, suchas screw
heads, antenna, control shafts, handlebrackets, etc. Equipment
withantennaterminalsshouldreadbetween3M and 5.2M toall
exposedparts*. (Fig1) Equipmentwithoutantennaterminals
shouldreadapproximatelyinfinitytoall exposedparts. (Fig2)
*Note:Someexposedparts maybeisolatedfromthechassisby
design. These will readinfinity.
4. Ifthemeasurementisoutsidethespecifiedlimits, thereisa
possibilityofashock hazard. Theequipmentshouldberepaired
and recheckedbeforeitisreturnedtothecustomer.
4
5
2. BeforeRepairand Adjustment
DisconnectACpower, dischargePowerSupplyCapacitorsC1702 through a10 , 5Wresistor
toground. DONOTSHORT-CIRCUITDIRECTLY(withascrewdriverblade, for instance), as this
may destroysolidstatedevices.
Afterrepairsarecompleted, restorepowergraduallyusing avariac, toavoidovercurrent.
Currentconsumption atAC120 V, 60 HzinNOSIGNALmodeshouldbe400~1200 mA.
3. Protection Circuitry
Theprotection circuitrymay have operatedifeitherofthefollowing conditionsarenoticed:
-Nosound isheardwhenthepoweristurnedon.
-Stopsduring aperformance.
Thefunction ofthiscircuitryistopreventcircuitrydamageif, for example, thepositive and
negative speakerconnection wires are“shorted”, or ifspeakersystemswithanimpedance less
thantheindicatedratedimpedance oftheamplifierareused.
Ifthisoccurs, followtheprocedureoutlines below:
1. Turnoff thepower.
2. Determinethecause oftheproblemand correct it.
3. Turnon thepoweronce againafteroneminute.
Note:
Whentheprotection circuitryfunctions, theunitwill notoperateunless thepowerisfirstturned
6
off and thenon again.
4. Accessories ACpowersupplycord... 1pc.
AMLoop AntennaSet/ ... 1set.
FMIndoor Antenna... 1pc.
RemoteControl / Transmitter... 1pc.
5. Front Panel Controls
5.1. FrontPanel
7
5.2. Remote Control
8
6. Operation Checks and MainComponent
Replacement Procedures
“ATTENTIONSERVICER”
Somechassiscomponentsmaybehave sharp edges. Becareful whendiassembling and
servicing.
1. Thissection describes procedures forchecking theoperation of
9
themajorprintedcircuitboardsand replacing themain
components.
2. Forreassemblyafteroperation checks orreplacement, reverse the
respectiveprocedures. / Special reassemblyprocedures are
describedonlywhenrequired.
3. Select itemsfromthefollowing index whenchecks orreplacement
arerequired.
Content
-Checking ProcedureforeachmajorP.C.B.
...................................................................................................................
P.g. 7~9
-MainComponentReplacementProcedures
1. ReplacementofthePowerICand Regulator
Transistor.............................................................................................
P.g. 10
2. Installation ofthebottomcoverafter
replacement...........................................................
............................................ P.g. 11
6.1. Checking ProcedureforeachmajorP.C.B.
Step1&2Unscrewand remove top cabinetas shown.
10