Technics SA-DV250 User manual

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Service Manual
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ORDERNO.AD0103076C2
Stereotuner/amplifier
lSA-DV250
Colour
(S).......................SilverType
Areas
EB.......................Great Britain.
EG.......................Europe.
System:SC-DV250
Becauseofuniqueinterconnecting cables,when a
compact requiresservice,send orbring in theentire
system.
Specification
•AmplifierSection (Lowfrequencyside)
Poweroutput
DIN100Hz, THD 1%,8 bothchannelsdriven:
2x45W
RMS 100Hz,THD 10%,8 bothchannelsdriven:
2x65W
•AmplifierSection (Highfrequencyside)
Poweroutput
DIN1kHz,THD 1%,6 bothchannelsdriven:
2x25W
RMS 1kHz, THD 10%,6 bothchannelsdriven:
2x35W
Poweroutput(prologic mode)
DIN (front: high frequency)1kHz,THD 1%, 6 bothchannelsdriven:
2x25W
(front: lowfrequency) 100Hz,THD 1%,8 bothchannelsdriven:
2x45W
(surround) 1kHz,THD 1%, 8 bothchannelsdriven:
2x30W
(center) 1kHz,THD 1%, 8 :60W
RMS (front: high frequency)1kHz,THD 10%,6 bothchannelsdriven:
2x35W
(front: lowfrequency)100Hz,THD 10%,8 bothchannelsdriven:
2x65W
(surround) 1kHz,THD 10%,8 bothchannelsdriven:
2x40W
(center) 1kHz, THD 10%, 8 :80W
• Totalharmonicdistorition
Ratedpowerat 1kHz/6 :1%
Halfpowerat 1kHz/ 6 :0.1%
• Loadimpedance
Front (high frequency): 6
(lowfrequency): 8
Surround: 8
Center: 8
• FM tunersection
Frequencyrange: 87.50-108.00MHz
(0.05MHzsteps)
Sensitivity(S/N26dB): 1.5μV
S/N: MONO 70dB
(75dB,IHF)
Antennaterminals: 75 (unbalance)
• AMtunersection

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7.1Todisplay themalfunctioncode
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Fig. 7-1
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U70 DVD:
Automaticallydisplayson the
U70 DECK: tuner/amplifierwhenamalfunction occurs.RefertoFig. 7-1.
F61: Automaticallydisplayson thetuner/amplifierwhenamalfunction occurs.RefertoFig.7-1.

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7.2Toreturntothenormal display
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1. ForU70 DVD/U70 DECK
¡Pressananyoperation button on thetuner/amplifier.
¡Tore-display thecode,switchthepoweroff(POWERSTANDBYbutton),and then
switchpowerbackon again.
2. ForF61
¡IfF61 isdisplayed, thepowerwill automaticallybeswitchedoff and thestandby
indicatorwill lightup.
¡F61 will bedisplayed for3 seconds,and thentheclockwillbedisplayed.
¡Tore-display thecode,switchthepoweron.F61 will bere-displayed, and thenafter3
secondstheclockwill bedisplayedand thepowerwill automaticallyswitchoff.
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7.3.1U70 DVD,U70 DECK/(displayed
automatically)
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lProblemorcondition
Abus-linecommunicationserrorhasoccurredasaresult oftheflatcablesbeinginserted
incorrectly, thuspreventingthesystemfromoperating.
¡IfU70 isdisplayedon thetuner/amplifier, theCassettedeckorDVD Changercannotbe
operatedby remotecontrol.
lCorrection Procedure
1.Tocheckforcorrectinsertion oftheflatcables.
nInserteachconnectorsuntil you hearaclick.
nInserttheflatcablesatthebackoftheunit intheorderindicated.RefertoFig.8-
2.
Makesurethewhitesideofthecablesison yourrightside.RefertoFig.8-3.
Fig. 7-2.
Fig. 7-3.
2.Breakageoftheflatcables.(Checkand replace.)
3.Iftheproblemisnotcorrectedby items1 and 2above,thisindicatesafaultyIC.
SA-DV250:
IC901 (C2BBFD000317)

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SL-DV250:
IC401 (M38504E6227F)
RS-DV250:
IC701 (M38503M2406F)
ChecktheseICsand replace.
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7.3.2F61
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lProblemorcondition
Whenthepowerswitchisswitchedon,it automaticallyswitchesback off,makingit
impossibleto switchpoweron.
lCorrection procedure
FaultyTuner/Amplifier(SA-DV250)outputIC(IC601).
(WhenaDCvoltageisappliedtospeakerterminals.)
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S904
(PLAY/ REC)
SCHEMATIC DIAGRAM-1
FL901 (A2BB00000084)
1
7
5
4
6
3
2
T
S
S908
(INPUT SELECTOR)
S907
(SET)
S906
(TUNING MODE)
S905
(FM AUTO/MONO)
JK903
PHONES
3.5mm STEREO
R997
150
R996
150
D973
MA4030MTA
C921
1000P
C922
35V33
C920
25V22
R922
10K
R921
10K
R944
2.2K
R912
4.7K R911 3.3K R910 2.2K R909 1.8K R916 1.5K R915 1.2K R914 1K R913 820
R907
3.3K R906 2.2K R905 1.8K R904 1.5K R903 1.2K R902 1K R901 820
FL DISPLAY
1 6 8 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 53 542 5 7 9
W905
S901
(/)
C928
25V22
NOTE:
The number which noted at the connectors on the schematic diagram as
"SCHEMATIC DIAGRAM-1" or "SCHEMATIC DIAGRAM-2"
indicates the schematic diagram serial number located on the left corner in the schematic diagram.
AOPERATION CIRCUIT
C919
25V22
C927
25V22
C396
0.047
C923
0.1
C395
0.047
D974
MA165TA
C907
470P
C924
0.1
C904
0.01
R924
1K
C908
470P
R925
1K
S914
(PS)
S915
(PTY)
S910
(TUNING, )
S911
(TUNING, )
S912
(TUNER/ BAND)
S913
(DIGITAL
S.WOOFER)
(RDS DISP MODE)
ABCD
E
FGH I JKLMNOPQRSTU
X
W
V
ABCDEFGHIJKLMNOPQRSTUVWXYZ
S902
(CLOCK/ TIMER)
S903
(-DEMO)
:AUDIO SIGNAL LINE

SCHEMATIC DIAGRAM-2
IC901
C2BBFD000317
SYSTEM CONTROL/
FL DRIVE
C
B
A
Q901
UN4212TA
RESET
R936
100
R919
15K
R991
47K
R918 10K R928 47K
L902 1 H
D901
1SS291TA
L901
10 H
R951
330K
R952
10M
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
R993
100K
D931
MA165TA
D933 MA165TA
R990
100K
C916
6.3V100
D951
LNJ301MPUJAD
(DIGITAL S.WOOFER)R995
220
D954
SELS5923C
(PLAY/ REC)R986
1.5K
D306
SELS5223C
( ) R939
1.5K
C905
1000P
C901
6.3V100
R935 100 R934 100
R988 1K
R937 10K
R987 1K
R926
2.2K
C912
0.1
R954
100K
C926
1000P
R960 1.5K
R958 1K
R999
100K
R959 47
R969
2.7K
D902
1SS291TA
C903
0.01
C902
10V1000
X902
(32.7kHz)
C911
18P
C910
20P
X901
(6MHz)
1
3
2
D905 1SS291TA
EFIKLMNO Q
R940
1K
R929 1K
R930 1K
R932 1K
R931 1K
R976
100K
R956
1K R957 1K
C915
0.01 C925
1000P
R953 100
A
B
C
D
G
H
J
C914
50V2.2
D904
MA165TA
A
B
C
D
E
ABCDEFGHI JKLMNOPQRST UVWX
1
11
21
2
12
22
3
13
23
4
14
24
5
15
25
6
16
26
7
17
27
8
18
28
9
19
29
10
20
30
3132333435363738394041424344454647484950
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
- VP
P13
P14
P15
P16
P17
P18
P19
P20
P21
P22
P23
P24
P25
P26
P27
P28
P29
P30
P31
P32
VDD4
P33
P34
P35
P36
P37
P38
REGIN0
REGIN1
8G
REMOCON
RDS DATA
RDS CLK
HP SW
MIC DET
VR JOGA
VR JOGB
NC(GND)
SH REQ
KEY KARAOKE
KEY TU
VDD1
XC OUT
XC IN
Vss
X OUT
XIN
RESET
AC IN
SEL/ TUNER
SEL TUNER
ST/ AV.6CH
LC72 CK
LC72 DI/ ST
LC72 CE
LC72 DO
CHECK
STAND-BY TIMER S.W.LED LOUNGE CHORUS MUTE NC POWER Vss2 VDD2 MUTE2 NC MUTE3 SHCS SHDO SHDI SHCK E DET CR TIMER SD
VDD3
P12
P11
P10
P9
P8 P7 P6 P5 P4 P3 P2
P1
1G 2G 3G 4G 5G 6G 7G
R994 100K
U
R949
4.7K
R950
100
: POSITIVE VOLTAGE LINE : NEGATIVE VOLTAGE LINE
5.1V
5.1V
2V/2ms.DIV.
5V
0V
5V
0V
T10ms.
2V/2ms.DIV. 0V
5V
- 30.1V
- 30.1V
- 29.3V
- 29.3V
- 29.3V
- 26.3V
- 20.5V
- 29.3V
- 29.3V
- 29.3V
- 23.5V
- 20.5V
- 23.4V
- 23.4V
- 23.7V
- 20.7V
- 29.6V
- 29.6V
- 29.6V
- 23.7V
- 26.6V
- 26.5V
5.1V
- 29.5V
- 29.5V
- 26.5V
- 17.2V
- 5.3V
- 10.3V
0.4V
0V
-
23.4V
-
20.5V
-
26.3V
-
26.3V
5.1V
-
23.4V
-
20.5V
-
26.2V
-
29.2V
-
26.2V
-
26.2V
-
26.1V
-
26.3V
-
23.5V
-
23.5V
-
25.6V
-
27.5V
-
27.5V
-
25.5V
-
23.5V
- 25.6V
5.1V
2.6V
2.6V
0.6V
5.1V
0V
0V
1.4V
5.1V
5.1V
5.1V
2.3V
2.3V
2.7V
1.6V
5V
2.2V
0V
5.1V
5.1V
4.6V
0V
0V
2.5V
0V
5V
0V
5.1V 3.3V 1.9V
1.9V
1.4V
0V
5.1V 5.1V
4.8V
0V 0V 0V 0V 0V 0V
FM / AM
- 30V
4V
T 5.5ms.
0V
0V
4V
T 5.5ms.
- 30V
FM / AM
3.3V
P-P
F=6MHz
FM / AM
4.2V
P-P
F=6MHz
FM / AM
5.2V
P-P
F=32.7kHz
FM / AM
5.2V
P-P
F=32.7kHz
FM / AM
2V
P-P
F=32.7kHz
FM / AM

SCHEMATIC DIAGRAM-3
W901B
W902B
IC151
C1BB00000527
RDS SIGNAL
DEMODULATOR
123
X151
R158
1K
R154
100K
R153
100K
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
BA
COM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Q902
UN411FTA
MUTING CONT.
ABC
1
2
3
4
5
6
7
8 9
10
11
12
13
14
15
16
VREF
HPX IN
VDDA
VssA
FL OUT
CIN
TEST
X OUT
IDR
RDCL
RDDA
RST
MODE
VDDB
VssB
XIN
R962
22K
VR901
EVQVBXFK124B
(VOLUME)
R945
100
R961
22K
R943
100
C917
0.01
C155
1000P
C153
1000P
C160
1000P
C159
6.3V47
R152
1K
R151
1K
C154
560P C158
6.3V47
C151
16V10 D907
MA165TA
M
BC
R946
1K
C909
1000P C918
6.3V100
DEA
R941
1K
L153
1H
R155
120
D151
MA4051MTA
L151
100 H
L152
100 H
C156
47P
C157
47P
A
B
C
D
E
F
G
H
I
J
K
L
N
O
Q
S
T
AOPERATION CIRCUIT
R942
2.2K
R974
1K
C931
16V10
R965
3.9K
R966
3.9K
D961
MA4075MTA R975
22K
D906
MA165TA
U
N
1
2
3
Z901
B3RAD0000028
(REMOTE SENSOR)
R157
1K
C152
330P
: POSITIVE VOLTAGE LINE : NEGATIVE VOLTAGE LINE
-30.1V
5.1V
:AUDIO SIGNAL LINE
6V
7.6V
3.3V
0V
3.3V
2.6V
2.6V
0V
5.1V
2.5V2.7V
2.5V
2.5V
5.1V
2.5V
2.5V

SCHEMATIC DIAGRAM-4
W902A
W901A
CP101
C
F
G
B
A
E
D
DET
Rch IN
CE
Lch IN
DI
DO
CL
+B(2)
SD
+B(1)
T.GND
Q707
2SB1417PQTA
REGULATOR
Q723
2SC3940AQSTA
REGULATOR
R763
4.7K
R230 1K
R229 1K
D721
MA4300MTA R708
4.7K
C707
0.047
C706
35V10
C737
100
To
SOUND
PROCESSOR
(SH-DV250)
To TUNER UINT
on SCHEMATIC
DIAGRAM-10
C735
0.047
B
A
R563
2.7K
R564
2.7K
C660
16V10
C659
16V10
R615
4.7K
R614
4.7K
R631
3.9K
R632
3.9K C202
0.1
R203
100K
R204
100K
C201
0.1
C602
16V10
C708
0.047
R211
270
D201
MA4056MTA
R687
1.5K
R688
1.5K
Q605,606
2SD2144STA
MUTING Q605
Q606
R683
1K
R617
4.7K
2
1
3
4
5
6
7
8
9
10
11
C
B
A
X0X1VDD
G
Vss
INHZ0Z1Y1 Y0
16 15 14 13 12 11 10 9
12345678
IC201
BU4053BCFE2
SIGNAL SELECTOR
C655
16V10
C656
16V10
R606
4.7K
R605
4.7K
2
15
3
4
5
6
7
8
9
10
11
12
13
14
1
2
15
3
4
5
6
7
8
9
10
11
12
13
14
1
20
2
1
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
K
L
M
I
J
E
F
C
D
E
F
G
E
F
G
A
B
C
D
A
B
G
H
C601
16V10
R598
2.2K
R597
2.2K
R205
100K
H
G
R202
100K
B
C
D
E
F
C509
0.01
C510
0.01
R693
1K
R692
1K
C664
16V10
C725
16V47
A
C
R696
47K
Q609,610
2SD2144STA
MUTING
Q609
Q610
Q612
UN411FTA
MUTING CONT.
B
CR694
22K
R511
47 R509 47
R512 47 R510 47
W501
D719
RL1N4003N02
D720
RL1N4003N02
D717
RL1N4003N02
D718
RL1N4003N02
H
D
C
R695
470
D611
MA4051MTA
C740
16V10
C733
0.047
D737
MA4082LTA
R764
330
MAIN CIRCUIT
B
C731
1000P
C741
0.1
TUNER Lch/C
TUNER Rch
A.GND
Lch IN
Rch IN
+B(10V)
SUR L
SUR R
S.W
MIC
- B( - 10V)
V.GND
D.GND
CS/ REQ
CLK
DATA
CT GND
SH FL1
SH FL2
SYNC
R603
3.3K
A
B
B
R684
1K
A
C715
6800
C714
1000P
D705
RL1N4003N02
A
: POSITIVE VOLTAGE LINE
: NEGATIVE VOLTAGE LINE : FM SIGNAL LINE
: AM SIGNAL LINE
14.7V
10.4V
- 37.3V - 30.1V
- 30.7V
14.7V7.2V
7.8V
- 10V
- 10V
0V
0V
- 10.2V
5.1V
4.9V
0V
- 10V
0V
0.7V
:AUDIO SIGNAL LINE
5.7V 0V 0V 0V 0V 0V
6V
7.2V
7.6V
- 10.4V
0V 0V - 10.4V
:MIC SIGNAL LINE