ELECTRICAL ADJUSTMENTPRACTICAL SERVICE FIGURE
<TUNERSECTION><DECK SECTION>
<FM SECTION>Distortion:Lessthan3% (PB)
IHFSensitivity:Lessthan15dBLessthan3% (REC/PB)
(THD 3%)[at87.5/98MHz]S/Nratio:Morethan35dB(PB,AC,DC)
Lessthan20dBMorethan30dB(REC/PB,AC,DC)
[at108.OMHZ]Erasingratio:Morethan45dB
Signaltonoiseratio: Lessthan65dB(DC,AC,TONECENTER)
[at98.OMHZ]Wow & flutter:Lessthan0.4%(R,M.S)
Distortion:Lessthan2% (Input54dB)Take-uptorque:20- 60g-cm(FWD/REV)
Lessthan5% (Input120dB)F,F& REW torque: 55- 120g-cm
[at98.OMHZ]Testtape:TTA-1OO
Stereoseparation:Morethan20dBTTA-320
[at98.OMHZ]
Intermediatefrequency: 10,7MHz
<AM SECTION>
Sensitivity:Lessthan50dB
(S/N10dB)[at600kHz]
Lessthan58dB
[at1000/1400kHz]
Signaltonoiseratio: Morethan30dB
[at1000kHz]
Distortion:Lessthan5% (Input74dB)
Lessthan10% (Input120dB)
[at1000kHz]
Intermediatefrequency: 450kHz
<TUNERSECTION>
6. DC Balance/Mono DistortionAdjustment
-1,AM IFAdjustmentSettings:lTestpoint:TP2,TP3
L814................................................450kHzlAdjustmentlocation:L815
Settings:lTestpoint:TP2lInputlevel:54dB
Method:SettoAM 1710kHzandcheckthatthetestpointis
Method:SettoFM 98.OMHZandadjustL815sothatthe
2160kHz* 45Hz.
voltagebetweenTP2 andTP3becomesOV & 0,04V.
2, AM VT Adjustment
7. FM AutoStopLevelAdjustment
Settings:lTestpoint:TP1Settings:lAdjustmentlocation:SFR802
lAdjustmentlocation:L810Method:SettoFM 98.OMHZandadjustSFR802machine
Method:SettoAM 1710kHzandadjustL81Osothattest
performsAutoStopwhen30* 2dB isinput.
pointis6.0&0.05V.
3, AM TrackingAdjustment
L808................................................600kHz< DECK SECTION>
TC802 .................,.,.,..,.,.,,.,...........1400kHz
8. TapeSpeedAdjustment
Settings:lTesttape:TTA-1OO
4, FM VT Adjustment
lTestpoint:TP4,5,6
Settings:lTestpoint:TP1
lAdjustmentlocation:L804lAdjustmentlocation:SFR ofdeckmotor
Method:SettoFM 108.OMHZandadjustL804sothattestMethod:PlaybackthetesttapeandadjustSFR1sothatthe
outputfrequencyis3000Hz.
pointis5.8*0.05V.
9. AzimuthAdjustment
5. FMTrackingAdjustment
Settings:lTesttape:?ITA-320
L802,803........................................98MHz
lTestpoint:TP4,5,6
lAdjustmentlocation:Headazimuth
adjustmentscrew
Method:Playbackthetesttapeandadjustsothattheoutputis
maximum.
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