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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14.1.2Detail ViewofEJECTLever/(EJECT
lever fixedbyrubberband,Plungerrib
operation)
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Fig. 14-2.
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3
6
4
MAIN CIRCUIT
A
B
A
C
B
A
CP101
1
2
3
4
5
CP102
1
2
3
4
5
IC103
BA7755AF
R/P SELECT
1 2 4
678
3
5
Q301
2SD1819ARTX
BIAS OSC CONT.
Q306
DTC144EUT106
BIAS OSC CONT.
Q305
DTC144EUT106
BIAS OSC CONT.
Q302
2SD1328STXRA
SWITCHING
(REC:ON) Q303,304
2SD1450RSTA
BIAS OSC
Q303
Q304
Q102
2SJ164RTA
HEAD SELECT
(REC:ON)
Q106
Q103,104
2SJ164QTA
HEAD SELECT
(PLAY:ON)
Q104
Q103
Q105,106
2SD1819ARTX
MUTING
Q105
Q101
2SJ164RTA
HEAD SELECT
(REC:ON)
S
G
D
S
G
D
D
G
S
D
G
S
L301
IC101
CXA1998BQT6
R/P EQ AMP
1
25
Lch
Rch
PLAYBACK
HEAD
DECK1
Lch
ERASE
HEAD
DECK2
Rch
R/P HEAD
R106
330K
C102
680P
C101
680P
R105
330K
C143
470P C115 470P
R101
5.6K
R103
100K
C150
10V100
C123
25V4.7
R119
22
R118
22
C130
16V100
C119
50V1
C140
16V10
C131
470P
C129
10V22 R117 1K
C117
330P
R111
82 R113
12K
C111
6.3V47
R109
1K
C109
0.018
R141
100
R142
100
R144
100
C144
470P
C104
680P
C110
0.018
C112
6.3V47
R112
82
R114
27K
R110
1K
C114
50V2.2
C113
50V2.2
R102
5.6K
R104
100K
C116
470P
C125
3300P
C126
3300P
C118
330P
R154
2.7K
C120
50V1
R133 33K
R130 4.7M
C139 6.3V47
R132
27K
C301
16V470
C303
6800P C302
100V2.2
N
R313
1
TP302TP301
R302
1.8K
R301
10K D301 MA111TX
C305
50V0.1
C304
16V100
R303
2.2K
R304
15K
R305
18K
R306
33K
R138
4.7K
R137
2.2K
C309
6.3V47
R308
1K
C311
0.01
C310
0.01 C308
3300P
R307
2.2
C323
1000P
C307
1000P
R309
4.7K
R310
4.7K
R311
4.7K
L302
100 H
R134
3.9K
R135
6.8K D102
MA111TX
D101
MA111TX
R158 22K
R127
4.7K
R125
100K
C138
0.047
C137
50V0.1
C135 50V1 C136 50V1 R120
100K
C132
470P
R153
2.7K
R157
22K
C103
680P
R143
100
R107
10K
R131
330K
R108
10K
LATCHES
SHIFT
REGISTERS
PBEQ
CTL
AGC
AMSRECEQ
20K 20K
10K
MUTE
40K
AGC
GAIN
210K
210K
210K 210K
IREF
40K
AGC
GAIN
10K
RECEQ
RFS
1 2 3 4 5 6 7 8 9 10 11 12
13
23
2437
38
39
40
41
42
43
44
45
46
47
48 20K 20K
252627282930313233343536
REQEQ
CTL
22
21
20
19
18
17
16
15
14
C306
0.039
R136
2.2K
C124
25V4.7
9.6V
:POSITIVE VOLTAGE LINE : PLAYBACK SIGNAL LINE: RECORDING SIGNAL LINE
9.6V
0V0V
(0.2V)
9V
0V0V
0V0V
(8.9V)
0V
(0.7V)
0V
0V
0V
0V
(0.7V)
0V
(8.9V)
(0.2V)
9V
0V0V
6V
9.6V 0V 0V
(9.5V)
0V
(0.7V)
0V
0V
(0.6V)
0V 0V
(0.6V)
0V
(0.7V)
0V
(0.8V)
0V
(0.6V)
0V
9.5V
9.5V (0.6V)
0V
0V
(0.1V)
(0.1V)
0V
ERASE CURRENT
CHECK POINT
5V 0V 4.5V 4.5V 4.5V 4.5V 4.5V 8.6V 5V0V
(1.6V) 0V (0.2V)
5V
5V
(9.6V)
0.1V
(0.1V)
9.6V
(0.2V)
9.6V
(0.2V)
5V
(5V)
0.2V
4.5V9V9V 4.5V 4.5V 4.5V 4.5V 0V5V 0V
1.2V
2.6V
2.6V
1.3V
0V
0V
0V
0V
1.3V
2.6V
2.6V
1.2V

DOLBY
Rch
F
D
E
CNRMO
B
A
IC201
CXA1552M-T4
DOLBY B NR
12345 8
912131415
ATT2
ATT2
ATT3
ATT3
ATT1
ATT1
SC DET
SC DET
6 7
101116
ON/OFF
R/P
BA
J
I
A
B
A
B
IC102
MC14066BFEL
DECK 1/2 SELECT
1 2 3 4 5 6 7
891011121314
Q107
DTA143EUT106
R/P SELECT
Q202
DTA143EUT106
ENC/DEC SELECT
Q201
DTA143EUT106
DOLBY ON/OFF
R209
1K
R725
2.2K
R730
2.2K
R726
2.2K
C134
470P
C133
470P
C142
0.1
C203
25V4.7 R211 10K
C207
270P
L201
R218
2.2K
R217
2.2K
C211
1500P
C220
10V470
C219
16V100
C241
0.01
R237
22 R220 22
C239
680P
C205
50V1
R221
100
R230
1K
R223
10K
C223
25V4.7
C221
50V0.68 R213
3K
R215
12K
C213
25V4.7
C225
25V4.7
C217
50V0.1
R222
100
R219
18K
C206
50V1
C240
680P
C212
1500P
R212
10K
R210
1K
C204
25V4.7
C208
270P
L202
C214
25V4.7
R216
12K
C226
25V4.7
R224
10K
R231
1K
R151
100K
R140
47K
R152
100K
R139
47K
C141
50V1
R148
5.6K VR102
20K(B)
R150
5.6K VR104
20K(B)
R214
3K
C222
50V0.68
R149
5.6K VR103
20K(B)
R147
5.6K VR101
20K(B)
C218
50V0.1
DOLBY
Lch
C
R122
10K
R121
10K
:POSITIVE VOLTAGE LINE : PLAYBACK SIGNAL LINE: RECORDING SIGNAL LINE
5V
5V
9.6V
9.6V
(0.2V)
9.6V
0V
(9.5V)
4.8V 9.6V 4.7V 4.7V 4.6V 4.7V 0.4V 4.8V
4.8V 4.7V 1.2V 4.7V 0.4V 4.8V4.6V
(0V)
0V
5V
5V5V
(0V)
5V (5V)
0V
PLAYBACK
GAIN ADJ.
(DECK1/Lch)
PLAYBACK
GAIN ADJ.
(DECK2/Lch)
PLAYBACK
GAIN ADJ.
(DECK1/Rch)
PLAYBACK
GAIN ADJ.
(DECK2/Rch)
9.6V 9.6V
(0.1V) 0V0V0V 0V9.6V (0.1V)
0V0V0V 0V (9.6V)
0.1V (9.6V) 0.1V
DOLBY
ON : 0V

MAIN CIRCUIT
A
MECHANISM CIRCUIT (DECK1)
B
MECHANISM CIRCUIT (DECK2)
C
CP901
CS951
CP902CS971
Q806
DTA143EUT106
MOTOR DRIVE CONT.
Q804
2SD592ARSTA
MOTOR DRIVE
CP305
1
2
3
4
Z971
1234567
4.7K
50K
25K
4.7K 4.7K 4.7K
50K 50K 50K 50K
25K 25K
A
B
D
C
IC971
0N2180RLC1
PHOTO
INTERRUPTER
CAB
Q803
2SD592ARSTA
MOTOR DRIVE
Q805
DTA143EUT106
MOTOR DRIVE CONT.
CP306
1
2
3
4
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
Q807
2SB621ARSTA
SOLENOID DRIVE
Q809
DTC143EUT106
SOLENOID DRIVE
Q810
DTC143EUT106
SOLENOID DRIVE
Q808
2SB621ARSTA
SOLENOID DRIVE
DL EK
CAPSTAN
MOTOR
(DECK1)
A
B
M
CAPSTAN
MOTOR
(DECK2)
A
B
M
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
R806
10K
R802
560 R823 560 R824 560 R812 560
R811
10K
R814
470
R818
2.2
R805
3.9K R803 10K
R810
10K R808 3.9K
VR803
5K(B)
VR801
5K(B)
R820
2.2
R813
470
B
A
C
R952
820 D951
MA165TA
SOLENOID
S951
(MODE)
S953
(CrO2)
S952
(HALF)
S973
(CrO2)
S976
(METAL)
S972
(HALF)
S971
(MODE)
S974
(R.REC.INH.)
S975
(F.REC.INH.)
R972
820 D971
MA165TA
SOLENOID
D
IC951
0N2180RLC1
PHOTO
INTERRUPTER
R953
39K
12
34
A
G
H
B
Q
S
P
F
R973
39K
1 2
3 4
:POSITIVE VOLTAGE LINE
5V
10.3V
5V
10.3V
5V
10.3V
5V
5V
10.3V
0V
10.3V
0V
0V
10.2V 0V 10.2V
0V
10.3V
0V
10.3V
0V
0V
9.8V 5V
0V
5V
TAPE SPEED
ADJ.(DECK1)
0V
5V
5V
0V 0V
0.8V
TAPE SPEED
ADJ.(DECK2)

TP609
CN601
CN901
IC701
M38503M2406F
SYSTEM CONTROL
E
C
A
B
D
J
I
H
G
F
PQR
JEDG
AC E
E
D
A
C
B
I
H
F
Q701
Q703
Q702
2SD1819ARTX
INTERFACE
13
2
X701
(8MHz)
CBAFIOJKLMNGH
Q604
2SC3940AQSTA
REGULATOR R603
10
TP604
+10V
(D.GND)
R602
0.33
R630
0.33
Q602
2SD2144STA
POWER SUPPLY
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
20
17
18
19
SYNC
CS
+B (10V)
D.GND
SCLK
DATA
DECK REQ
NC
TAPE Lch IN
A.GND
TAPE Rch IN
TAPE Lch OUT
TAPE Rch OUT
RS A.GND
EARTH
TERMINAL
CIRCUIT
D
W601 E1
1
2
3
4
5
6
7
8
Q701,703
2SD1819ARTX
INTERFACE
Q706
DTC114EUT106
RESET SIGNAL
GENERATOR
C707
0.01
D706
MA111TX
D710
MA111TX
BD
R745
100
R710 1K
R724 1K R723 1K
D707
MA4051MTA
L702
R738
1K R747 1K
R704
4.7K
R744
1K
R727
4.7K
R708
4.7K
R729
4.7K
R741
22K
D708
MA111TX
R743
47K
R705
47K
D709
MA111TX
R728
10K
R722
100
R703
5.6K
R732 100K
R721 4.7K
R735 4.7K
R632
47K
R609
100
D651
MA165TA
D652
MA165TA
R604
330
C602
16V220
C605
16V220
C603
16V47
D606
MA4056MTA C604
0.01
R606
1.5K
R712 68K
R718 68K
R701 10K
R702 10K
C705
0.01
C701
0.01
R711
100K
C702
6.3V100
C706
50V3.3
D705
MA111TX
R737 10K
R736 10K
D701
MA111TX
NC
NC
NC
NC
NC
NC
To
SOUND PRCESSOR
(SH-EH770) &
CD CHANGER
(SL-EH770)
CT.GND
Rch
OUT Lch OUT Rch IN Lch IN
A.GND
12345678910 11 12 13 14 15 16 17 18 19 20 21
31323334353637383940
4142 222324252627282930
KEY1 VCC
VREF
AVSS
LMT
PL1
M1
HALT
REQ
CS
CLK
VSS VSS
XOUT
XIN
RESET
REV LED
FWD LED
CRO2 2
METAL 2
DATA IN
DATA OUT
CRO2 1 MODE HALF1 TPS A LATCH PL2 M2 ENC/DEC
DOLBY ON/OFF ECS NC KEY2 NC NC A CLK ADATA LED CNT AD SW PHOTO1 T PHOTO2 T
F
EDABC
R232
10K
F
G
S
L701
10 H
:POSITIVE VOLTAGE LINE : PLAYBACK SIGNAL LINE: RECORDING SIGNAL LINE
5V
1.9V
0.1V
0V
1.8V
0V
0V
0.6V
0.2V
0V
5V
0V
0V
9.4V5V
5.7V
10.3V9.6V
10.3V
10.3V
5V
9.6V
5V 0V 5V
2.9V
5V 5V 5V 5V 5V
2.7V
0V 0V 0V 0V 0V
(5V) 0V
0V 5V
STOP : 0V
5V 5V 0V 5V 1.4V 2.2V 2.5V 0V 0V 0V 0V 0V 0.5V 1.6V 1V 5V 5V 2V 2.3V
1.2V
P-P
F=8MHz
2.4V
P-P
F=8MHz
4.8V
0V
T16ms.
3.6V
0V
T16ms.
3V
0V
T16ms.
0V
4.8V
T16ms.
5ms. 2V/DIV. 0V
4.8V
0V(5V)

FW901
OPERATION CIRCUIT
E
1
2
3
4
5
6
7
8
D907
SML79455C
()
Q901
DTA143EUT106
LED DRIVE
D905
SML79455C
()
Q902
DTC143EUT106
LED DRIVE
S907
( )
S906
( )
S905
(DOLBY NR)
S904
(REC PAUSE)
S903
(TAPE EDIT)
S901
(OPEN)
S900
()
S915
(OPEN)
S909
()
S910
()
S912
(DECK 1/2)
S911
(REV MODE)
S914
(COUNTER
RESET)
S913
(COUNTER
DISPLAY)
R911
2.2K
R910
1.8K
R909
1.5K
R908
1.2K
R925
1K
R924
820
R905
2.2K
R904
1.8K
R903
1.5K
R902
1.2K
R901
1K R906
3.3K
R900
820
R915
680
R914
330
R916
330
Q904
DTC143EUT106
LED DRIVE
Q903
DTC143EUT106
LED DRIVE
R917
680 D904
MA111TX
IC202
MC14066BFEL
SIGNAL CONT.
8 9 10 11 12 13
7654321
14
MAIN CIRCUIT
A
A
B
C
D
E
F
G
Q108
DTC143EUT106
SWITCHING
R126
22K
R234
100 C216 16V10
C215
16V10
R233
100
R226
47K
R208
47K
R225
47K
R207
47K
:POSITIVE VOLTAGE LINE
5V
5V
0V
5V
0V
0V
STOP :0V
5V
4.2V
0V
0V
0V
2.6V
0V
4.7V 8.3V
(0V) 9.6V4.7V 4.7V 4.7V
8.3V
(0V)
8.3V(0V)
(5V) 0V
9.6V
:PLAYBACK SIGNAL LINE