Panasonic SAHT280 - RECEIVER User manual

ORDERNo.MD0004059C1
A1
AVControl StereoReceiver
SA-HT280
Colours
(K)...........Black Type
(S)...........SilverType
Areas
PP...........U.S.A. and Canada
System:SC-HT280
SPECIFICATIONS
Specification

AMPLIFIERSECTION
Rated minimumsinewaveRMSpoweroutput
20Hz-20kHzboth channelsdriven / 0.05%total harmonic
distortion
100W perchannel (8 )
1kHzcontinuouspoweroutputboth channelsdriven
0.05%total harmonicdistortion
105W perchannel (8 )
Total harmonicdistortion
rated powerat20Hz-20kHz 0.05%(8 )
halfpowerat1kHz 0.03%(8 )
Poweroutputat1kHzeach channel driven
0.9%total harmonicdistortion
Front/ Center/ Surround /
Sub woofer(100Hz) 2x100W (8 )/ 100W (8
)/ 2x100W (8 )/ 100W
(8 )
Lowfrequencydamping factor 30 (8 )
Load impedance
Front
AorB/ Aand B 4-8 / 8
Center/ Surround / Sub woofer 8 / 8 / 8
Dynamicheadroom 2dB(8 )
Frequencyresponse
PHONO RIAA standard curve±
0.8dB
CD, TAPE, DVD, TV, VCR 10Hz-70kHz, ±3dB
Inputsensitivity
PHONO 0.4mV(3mV, IHF ’66)
CD, TAPE, DVD, TV, VCR 27mV(200mV, IHF ’66)
S/N(IHF A)
PHONO/ CD, TAPE, DVD, TV,
VCR 70dB(80dB, IHF ’66)/ 75dB (85dB, IHF ’66)
Inputimpedance
PHONO/ CD, TAPE, DVD, TV,
VCR 47k / 22k
Tonecontrols
BASS / TREBLE 50Hz, +10 to -10dB/ 20kHz,
+10 to -10dB
Subwooferfrequencyresponse / (-
6dB) 7-200Hz
Digital input
Optical CD, DVD, TV
FMTUNERSECTION
Frequencyrange 87.9-107.9MHz
Sensitivity 11.2dBf(2 V, IHF ’58)
50 dBquieting sensitivity
MONO 18.3dBf(4.5 V, IHF ’58)
STEREO 38.3dBf(45 V, IHF ’58)

Total harmonicdistortion
MONO/ STEREO 0.2%/ 0.3%
S/N
MONO/ STEREO 73dB/ 67dB
Frequencyresponse 20Hz-15kHz, +1dB, -2dB
Alternatechannel selectivity 65dB
Captureratio 1.5dB
Imagerejection at98MHz 40dB
Spuriousresponse rejection at
98MHz 75dB
AMsuppression 50dB
Stereo separation
1kHz/ 10kHz 40dB/ 30dB
Antennaterminal 75 (unbalanced)
AMTUNERSECTION
Frequencyrange/ Sensitivity/
Selectivity/ IF rejection at1000kHz 530 -1710kHz/ 20 V,
330 V/m/ 55dB/ 50dB
VIDEOSECTION
Outputvoltageat1Vinput 1±0.1Vp-p
(unbalanced)
Maximuminputvoltage/ Input/
outputimpedance 1.5Vp-p / 75
GENERAL
Powersupply/ Powerconsumption
/ Dimensions(W xHxD) AC120V, 60Hz/ 450VA, 350W / 430 x158 x320.5mm
/ (16-15/16”x6-7/32”x12-5/
8”)
Mass 10.2kg (22.4lb.)
Powerconsumption in standby/
mode: 1W
Notes:
1. Specificationsaresubjectto changewithout notice. / Mass and
dimensionsareapproximate.
2. Total harmonicdistortion ismeasuredbythedigital spectrum /
analyzer.
*
1Manufactured underlicense fromDolbyLaboratories
Licensing / Corporation. “Dolby”, thedouble-Dsymbol and
“PROLOGIC”/ aretrademarks ofDolbyLaboratories
Licensing Corporation.
*
2Thisproductismanufactured underlicense fromDTS, / Inc.
ofAmerica.
2000 Matsushita ElectricIndustrial Co., Ltd. All rights reserved.
Unauthorizedcopying and distribution isaviolation oflaw.

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
barriers, insulation papers, shields, etc.
5. Beforereturning theservicedequipmenttothecustomer, besure
tomake thefollowing insulation resistance test topreventthe
customerfrombeing exposedtoashock hazard.
1.1. Insulation Resistance Test
1. Unplug thepowercordand shortthetwoprongsoftheplug witha
jumperwire.
2. Turnon thepowerswitch.
3. Measuretheresistance valuewithohmmeterbetweenthejumper
ACplug and eachexposedmetal cabinet part, suchas
screwheads, antenna, control shafts, handlebrackets, etc. /
Equipmentwithantennaterminalsshouldreadbetween3M and
5.2M toall exposedparts*. (Fig.1)/ Equipmentwithoutantenna
terminalsshouldreadapproximatelyinfinitytoall exposedparts.
(Fig.2)/ *Note :Someexposedparts maybeisolatedfromthe
chassisbydesign. These will readinfinity.
4. Ifthemeasurementisoutsidethespecifiedlimits, thereisa
possibilityofashock hazard. Theequipmentshouldberepaired
and recheckedbeforeitisreturnedtothecustomer.

Fig.1
Fig.2
2. BeforeRepairand adjustment
DisconnectACpower, dischargePowerSupplyCapacitorsC703, C704, C705 and C706 through a
10 , 5Wresistor toground. / DONOTSHORT-CIRCUITDIRECTLY(withascrewdriverblade, for
instance), as thismay destroysolidstatedevices. / Afterrepairsarecompleted, restorepower
graduallyusing avariac, toavoidovercurrent. / Currentconsumption atAC120V, 60HzinNO
SIGNALmodeshouldbe600-1000mA.
3. Protection Circuitry
Theprotection circuitrymay have operatedifeitherofthefollowing conditionsarenoticed:
-Nosound isheardwhenthepoweristurnedon.
-Sound stopsduring aperformance.
Thefunction ofthiscircuitryistopreventcircuitrydamageif, for example, thepositive and
negative speakerconnection wires are“shorted”, or ifspeakersystemswithanimpedance less
thantheindicatedratedimpedance oftheamplifierareused. / Ifthisoccurs, followthe
procedureoutlines below:
1. Turnoff thepower.
2. Determinethecause oftheproblemand correct it.
3. Turnon thepoweronce againafteroneminute.
Note:
Whentheprotection circuitryfunctions, theunitwill notoperate
unless thepowerisfirst turnedoff and thenon again.
4. Accessories

5. Location of Controls
5.1. Mainunit
1. Power“ /I”switch(POWER, /I)
-Press toswitchtheunitfromon tostandbymodeorvice
versa.
-Instandbymode, theunitisstill consuming asmall amountof
power.
2. DSP modeselector(DPS)
3. SFCmodeselector(SFCMODE)
4. Inputindicators(INPUT)
5. Digital inputselect button / indicator(DIGITALINPUT)

6. Inputselector(INPUTSELECTOR)
7. Volumecontrol (VOLUME)
8. Speakerselect buttons(SPEAKERSA, B)
9. Help/reset button (-HELP, —RESET)
10. Headphones jack (PHONES)
11. Displaysection
12. Tapemonitorbutton (TAPE MONITOR)
13. Bass control (BASS)
14. Treblecontrol (TREBLE)
15. Balance control (BALANCE)
16. Subwooferlevel button (SUBWOOFERLEVEL)
17. Subwooferlow pass filterbutton (SUBWOOFERLOWPASS
FILTER)
18. Digital signal processoron/defeat button (—DSP ON/DEFEAT)
19. Tuning button (TUNING , )
20. Preset channel button (PRESET)
21. Band select button (BAND)
22. FMmodeselect button (FMMODE)
23. Memorybutton (MEMORY)
5.2. Displaysection
1. Tunedindicator(TUNED)

2. Monaural indicator(MONO)
3. Stereoindicator(STEREO)
4. Memoryindicator( )
5. Signal format indicators( , PRO LOGIC, DIGITAL)
6. Frontspeakerindicator(-SPEAKERS- )
7. Low impedance indicator(LOWIMP)
8. Display
9. Frequencyunitindicator(kHz, MHz)
10. Speakerindicatorsand signal inputindicators(L, C, R, LS, RS,
LFE)
-Thesignal inputindicatorslightpu toindicate thechannels
containedintheinputsignal. / L:Frontchannel (left) / C:
Centerchannel / R:Frontchannel (right) / LS:Surround
channel (left) / RS:Surround channel (right)
-Ifthesurround channel ismonaural, LSand RSaredisplayed
as S.
-“LEF”(Low FrequencyEffect) isachannel forthedeep-bass
effect inthelow frequencyrange.
6. Location of ControlsforRemoteControl
Transmitter
6.1. Remote control

1. Powerbutton ( )
2. button ( )
3. button ( )
4. button ( )
5. Top menu button (TOPMENU)
6. Displaybutton (DISPLAY)
7. Surround modeselect button (SURROUND)
8. Stereomodeselect button (STEREO)
9. Speakerchannel select button (LEVEL)
10. Delaytimebutton (DELAY)
11. Channel up/downbuttons( CH )
12. Muting button (MUTING)
13. Inputselect buttons/ (TV, VCR, TAPE, CD, TUNER/BAND, DVD)

14. button ( )
15. Cursor/enterbuttons
16. Menu button (MENU)
17. SFCmodeselect button (SFC)
18. Test button (TEST)
19. Delaytime/level adjust buttons(-, +)
20. Direct tuning/disc enterbutton / (DIRECTTUNING/DISCENTER)
21. 10/enterbutton ( 10/ENTER)
22. Numberedbuttons
23. Disc/deck 1/2select button (DISC/DECK 1/2)
24. TV/videoselect button (TV/VIDEO)
25. Volumebuttons(-VOL+)
7. Operation Checks and Component Replacement
Procedures
-Thissection describes procedures forchecking theoperation of
themajorprintedcircuitboardsand replacing themain
components.
-Forreassemblyafteroperation checks orreplacement, reverse the
respectiveprocedures. Special reassemblyprocedures are
describedonlywhenrequired.
7.1. Checking fortheFL P.C.B., surround P.C.B. and IN/OUTterminal
P.C.B.