Technics RS-DV250 User manual

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Service Manual
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AD0102028C2
Cassette Deck
lRS-DV250
AR-2 Mechanismseries
Colour
(S)..........SilverType
Area
(E)..........Europe.
©2001 MatsushitaElectricIndustrial Co., Ltd.Allrightsreserved.Unauthorized copying and distribution isaviolation of law.
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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.
FL
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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