Technics RS-DV250 Manuel utilisateur

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Service Manual

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AD0102028C2

Cassette Deck

lRS-DV250

AR-2 Mechanismseries

Colour

(S)..........SilverType

Area

(E)..........Europe.

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5Service ModeFunctionofCassette

Mechanism

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Thisunit isequippedwithaservicemodefunction ofcassettemechanism,sothatiftheunit operates

incorrectly, thefaultdisplayedusinganerrorcodeon theFLdisplayoftheTuner/Amplifier(SA-

EH770).ThesystemcontrolICand FLdisplayarepartoftheTuner/Amplifiersomakesurethe

systemhasbeenconnectedproperlybeforeusingthisfunction.Usethisfunction duringmaintenance

tocheckfaultsofitemsbelow.

5.1Cassettetapetobeprepared

5.2Selectingservicemode

5.3Deck1mechanismcheck

5.4Deck2mechanismcheck

5.5Exitingservicemode

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5.1Cassettetapetobeprepared

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lMetaltape:

Recordedmusictapewithonlyoneerasureprevention tabintact./(usemiddleportion oftape)

lNormaltape:/CrO2tape:

Recordedmusictapewithbotherasureprevention tabsintact./(usemiddleportion oftape)

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5.2Selectingservicemode

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1.Turnon thepowerto theunit.

2.Makesurethatno tapeisinsertedinthecassettedeck.(Servicemodecannotbeselectedwitha

tapeinsertedinthecassettedeck.)

3.PresstheDOLBYNRbutton forabout2seconds,and keeppressingit,alsopresstheSTOP

button forabout2seconds.Referto Fig.5-1.

Fig. 5-1.

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5.3Deck1mechanism check

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1.PresstheDeck 1/deck2selectbutton tochangetheflashingDeck2indicatorto Deck1. Refer

to Fig.5-2. /(NochangerequiredifDeck1indicatoralready flashing.)

2.PresstheDeck1cassetteholderopenbutton toopentheDeck1cassetteholder.Referto Fig.

5-2.

3.InsertaCrO2tapeinto theDeck1 and closethecassetteholder.

4.PresstheFastforwardbutton.Referto Fig.5-2. /(Tapefastforwardsforabout2 secondsthen

stops.)

5.PressthePLAY button. Referto Fig.5-2. /(AfterTPSoperation and check,thetapestops.)

6.OpentheDeck1cassetteholderand replacethetapewithanormaltape.

7.ClosetheDeck1cassetteholder.

8.PresstheRecordpausebutton. Referto Fig.5-2. /(Norecordoperation.)

9.PresstheSTOPbutton.Referto Fig.5-2. Amechanismerrorcodeisdisplayed.RefertoTable

5-1.EachtimetheSTOPbutton ispressed,thefault itemsaredisplayedinsequence.

Fig. 5-2.

Table5-1.

display

Symptom Cause

H01 Cassette deckdoesnotoperatecorrectly.Faultycassettedeckmechanismmodedetectswitch(Deck1:S951,

Deck2:S971),plungerandcapstanmotor./(Checkandreplace)

H02 Unitdoesnotrecordor theunitgoesintorecording modeevenwhenthe

erasureprevention tabshavebeenremovedfromthecassette.

Faultyerasurepreventiontabsdetectswitch(S974,S975) or short-

circuit.(Checkandreplace)

H03 Tapedoesnotplayevenwhenthetapedeckplaybutton ispressed.

Themotor operateswhenthetapedeckplaybutton ispressedevenif

cassette isloadedinthedeck.

Faultytapedetectswitch(Deck1:S952 Deck2:S972) or short-circuit.

(Checkandreplace)

H06 Cassette deckdoesnotdetect CrO2tape.FaultyCrO2tapedetectswitch(Deck1:S953,Deck2:S973)./(Check

andreplace)

H07 Cassette deckdoesnotdetect Metal tape.FaultyMetal tapedetect switch(S976).(Checkandreplace)

F01 Whenthetapeplaybutton ispressed,tapeadvancesonlyslightlyand

thenstops.

Reelpulseerror (FaultyHall IC).(Checkandreplace)

F02 TPS(tapeprogramsearch) doesnotwork.FaultyTPSsignal detectionor faultyplungercontrol. /(Checkand

replace mechanismcontrolIC)

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5.4Deck2mechanism check

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1.PresstheDeck 1/deck2selectbutton tochangetheflashingDeck1indicatorto Deck2. Refer

to Fig.5-3.

2.PresstheDeck2cassetteholderopenbutton toopentheDeck2cassetteholder.Referto Fig.

5-3.

3.InsertametaltapeintotheDeck2withanintacterasureprevention tabon therightside.

4.ClosetheDeck2cassetteholder.

5.PresstheFastforwardbutton.Referto Fig.5-3. /(Tapefastforwardsforabout2 secondsthen

stops.)

6.OpentheDeck2 cassetteholderand turnoverthemetaltape. (intacterasureprevention tabon

theleftside.)

7.ClosetheDeck2cassetteholder.

8.PresstheRewind button. Referto Fig.5-3. /(Taperewindsforabout2secondsthenstops.)

9.OpentheDeck2 cassetteholderand replacethemetaltapewithaCrO2tape.

10.ClosetheDeck2cassetteholder.

11.PressthePLAY button. Referto Fig.5-3. /(AfterTPSoperation and check,thetapestops.)

12.OpentheDeck2cassetteholderand replacetheCrO2tapewithanormaltape.

13.ClosetheDeck2cassetteholder.

14.PresstheRecordpausebutton. Referto Fig.5-3. /(Norecordoperation.)

15.PresstheSTOPbutton.Referto Fig.5-3. Amechanismerrorcodeisdisplayed.RefertoTable

5-1.EachtimetheSTOPbutton ispressed,thefault itemsaredisplayedinsequence.

Fig. 5-3.

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5.5Exitingservicemode

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1.PresstheSTOPbutton formorethan5seconds(Diagnosticcontentsstoredinmemoryfor

bothDeck1 and 2areerased.)

2.Removethecassettetapefromthecassetteholder.

3.Turnoff theunit.

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13.3Headazimuthadjustment(Deck1/2)

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1.Connectthemeasuringinstrumentasshownin Fig.13-1.

2.Replaceazimuthscrewsforbothforwardand reversedirectionsafterremovingthescrew-

lockingbond lefton theheadbase.(SupplypartNo.ofazimuthscrew: RHD17015 )

3.Playbacktheazimuthadjustmentportion (8kHz,-20 dB)oftesttape(QZZCFM).Adjustthe

azimuthscrewuntil theoutputsoftheL/Rcharemaximized. Referto Fig.13-2. Makesure

thatthedifferenceinthepeaklevelbetweentheleftand rightchannelsdoesnotexceed0.5dB.

4.Performthesameadjustmentinreverseplaybackmode.

Checkoftheleveldifferenceforwardand reversedirections.

5.Playbacktheplaybackgainadjustmentportion(315 Hz,0dB)oftesttape(QZZCFM).Check

ifleveldifferencebetweenforwardand reversedirection iswithin1.5 dB.

6.Aftertheadjustment,applyscrewlockto theazimuthscrew.

Fig. 13-1.

Fig. 13-2.

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13.4Tapespeedadjustment/(Deck1/2)

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Note:

Whenconnectingtheunit toothersystemcomponentsfortest,shortthesection betweenthetest

point TP604 and TP609 and turnon theentiresystem.(Theunit issettotheTESTmode,and either

Deck1 orDeck2indicatorwill blink.)

Normalspeed(Standardvalue:3000 ±45 Hz)

1.Connectthemeasuringinstrumentasshownin Fig.13-3.

2.Playbackthemiddleportionoftesttape.(QZZCWAT)

3.Adjust VR801 (Deck1)and VR803 (Deck2)foroutputvalueshownbelow.(Foradjustment

point,referto Fig.13-11. )

Adjustmenttarget:3000 ±15 Hz(Normalspeed)

Standardvalue:3000 ±45 Hz(Normalspeed)

Fig. 13-3.

Note:

Whentheunit isfinishedforadjusting,disconnecttheshortsection between TP604 and TP609 .

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14.1.1ConnectionDiagramBetweentheMechanismAss’yandPower

Supply/(MOTORandPlunger)

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Fig.14-1.

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