Panasonic MD0004056C2 User manual

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Service Manual
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ORDERNo.MD0004056C2
CDStereoSystem
SA-AK48
Colour
(S)........SilverType
Areas
(E)........EuropeandRussia.
(EB)......Great Britain.
(EG)......Germany,Franceand Italy.
TAPESECTION :AR2 MECHANISM SERIES
CDSECTION :RAE0152Z-MTRAVERSEDECKSERIES
SYSTEM:SC-AK48
Specifications
•AMPLIFIERSECTION
RMS poweroutput
THD 10%,bothchannelsdriven
(HIGH)40Wperchannel(6 )/(MID)40Wperchannel(6 )/(LOW)120Wperchannel(6 )/(TOTAL)200Wperchannel(6 )
/Inputsensitivity
AUX 250mV
Inputinpedance
AUX 13.9k
•FM TUNERSECTION
Frequencyrange 87.50-108.00MHz/(50kHzsteps)
Sensitivity 1.8μV(IHF)
S/N26dB 1.5μV
Antennaterminal(s) 75 (unbalanced)
•AMTUNERSECTION
Frequencyrange 552-1629kHz(9kHzsteps)
Sensitivity
S/N20dB(at 999kHz) 560μV/m
•CASSETTEDECKSECTION
Tracksystem 4track,2channel
Heads

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12.1ErrorDetectionforCassetteMechanism
block
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No. ErrorError
Display
ProblemCondition
1MODESWdetection errorH01 Faultyoperation of cassette mechanism./Faultycontactor short-circuit ofmechanismmodeswitch(S951,
S971)
2RECINHSWdetection
error
H02 Recording notpossible./Faultycontact or short-circuit ofRECINH switch(S974,S975)
3HALFSWdetection errorH03 Playbackcannotperform./Faultycontact or short-circuit ofHALFswitch(S952,S972)
4ReelPulsedetection errorF01 Thetapeadvancesslightlyandthenstops./Faultyreelpulse,faultyholedetect IC(IC951,IC971)
5TPSabnormal F02 Cassette deckwillnotperformTPSfunction./FaultyplaybackEQ/recording amplifierIC (IC1101)

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12.2ErrorDetectionforCD/Changerblock
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No. ErrorError
Display
ProblemCondition
1RESTSWdetection errorF15CDdosenotfunction./Thiserror occurswhentheOptical PickUpRESTSW(S701) is
notdetectedwithinthespecifiedtime(about8seconds)
2CDtrayopensautomaticallyF16CLAMP switch(S4)NG(Check&Replace)
3Doesnotstartup when/“TUNE/TIMEADJ^” button
is/pressed
F17BOTTOM switch(S5) NG (Check&Replace)
4Transmissionerror betweenCD/servoLSIand
micon
F26CDdoesnotfunction./Thiserror occurswhenthePOWERisON for theCDblockand
anerror isdetectedafterthetransmission hasstarted.
5Startupfailsevenwhenyou insertCDor the
selecteddisctraydoesnotopen
F27Tray1detect switchor Tray2detect switchNG (Check&Replace)
6CannotinsertCDF28Tray1detect switchNG (Check&Replace)
7CannotejectCDF29CheckifDiscisstuck.Tray2detect switchNG (Confirm&Replace)
8CDTrayclosesH15 CDdisctraydetectswitchNG (S3)(Check&Replace)

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12.3ErrorDetectionforCassetteMechanism
block
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No. ErrorError
Display
ProblemCondition
1POWERAMPoutput
abnormal
F61 WhenPOWERisswitchon,powerbecomeoffautomatically./Duringnormaloperation,ifDCDET becomeL,PCNT
shall becomeLandtheerror displayontheleftshall bedisplayed(IC500)

8765
1234
NBOUT GND NAOUT VREF
GND
Vcc BIN AIN
M
M
14 15 16 17 18 19 20
13 12 11 10 9 8 7
21 22 23 24 25 26
6 5 4 3 2 1
NC
RSTIN
IN3 IN4
VREF
Vcc
NC
GND
PVcc2
PGND2
NC
D4+
D4
-
D3+
D3
-
/RST NC IN2 PC2 NC IN1 NC GND PVcc1 PGND1 NC D1
-
D1+ D2
-
D2+
A
B
C
D
E
F
G
15
14
13
1616
15
14
13
1212
11
8
7
6
5
4
3
2
1
11
10
9
8
7
6
5
4
3
2
1
10
9
1516171819202122232425262728
1413121110987654321
PDE
PDF
Vcc
PDA PDB
LPD
LD
RF
RFIN
CSBRT
CEA
BDO
LDON
GND
FBAL TBAL VREF FEN FEOUT TEOUT TEN NC NC ENV NC OFTR PDOWN /RFDET
A
B
C
D
TP36
TP35
C737
0.1
C736
0.1
TP38
TP37
M702
SPINDLE
MOTOR
M701
TRAVERSE
MOTOR
AB CD
C735
0.1
C734
10V220
BADC BA
R736
100
AB
R729
3.9K
R728
3.9K
C739
1500P
R727
3.9K
R749 4.7K
C752
1000P
C738
0.01
R724
18K
R735
100
R723
6.8K
R731 6.8K
R715
1K
C715
2700P
R725
390
C714
6.3V100
C713
0.1
C712
0.1
C711
0.1
R708
22K
R707
39K
TP42 TP40
C749
2200P
R702
10K
C747
180P
R744
120K
C710
120P
R705
150K
TP33 TP32
R704
1K
R706
1K
IHGFEDC
C742
0.027
B
A
R701
4.7
C701
6.3V33
CN701
(RF)
TP29 C716
820P
TJ701
A
B
C
D
E
D
E
C
A
B
DCB A
C751
0.1 C750 0.1
VREF
C702
0.1
C706
2700P
C707
0.027
C704
0.1
C703
6.3V100
Q701
2SA1037AKSTX
LASER POWER
DRIVE
IC701
AN8839NSBE2
SERVOAMP
IC703
AN8739SBE2
FOCUS COIL/
TRACKING COIL/
TRAVERSE MOTOR/
SPINDLE MOTOR DRIVE
TRACKING
COIL
FOCUS
COIL
0.1
2
12
11
3
8
10
5
4
9
680P 680P
1K
0.1
0.047
6
Vcc
PDF
PDE
LD
GND
NB
GND
GND
NA
VREF
LPD
GND
T+
T
-
F+
F
-
A
LD
5V
5V
7.7V
CD SERVO CIRCUIT
SCHEMATIC DIAGRAM - 1
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.
OPTICAL PICKUP
1.6V 3.3V1.6V 1.6V 1.6V (0.2V) 0V (2.3V) 2.7V (1.4V) 0.9V 0.7V 1.9V 1.6V 0V (3.2V) 0V
1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 0V 3.2V
(0V)
(0.4V) (0.6V)
0V 0V 0V 0V 0V 7.5V 7.5V 1.6V 1.6V 1.6V
1.6V1.6V3.2V1.6V1.6V (0V) 0V 0V 0V 0V
(0.1V) (0.7V) (0.7V) 7.5V
PLAY 0.1V
P-P
2ms. 0.1V/DIV.
PLAY
2ms. 0.1V/DIV.
0.3V
P-P
PLAY
0.8V
P-P
0.5*s. 0.2V/DIV.
3.3V
7.4V
1.1V
(2V)
3.2V (2.3V)
2.7V
3.3V
(3V)
:POSITIVE VOLTAGE LINE :CD PLAYBACK SIGNALLINE

61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
2122232425262728293031323334353637383940
BCLK
LRCK
SRDATA
DVDD1
DVss1
TX
MCLK
MDATA
MLD
SENSE
/FLOCK
/TLOCK
BLKCK
SQCK
SUBQ
DMUTE
STAT
/RST
SMCK
CSEL
TRV TVD PC ECM ECS KICK TRD FOD
VREF
FBAL TBAL FE TE RFENV VDET OFT TRCRS /RFDET BDO LDON
PLLF2
DSLF2
WVEL
ARF
IREF
DRF
DSLF
PLLF
VCOF
AVDD2
AVss2
EFM
PCK
VCOF2
SUBC
SBCK
Vss
X1 IN
X2 OUT
VDD
BYTCK
/CLDCK
FCLK
IPFLAG
FLAG
CLVS
CRC
DEMPH
RESY
IOSEL
/TEST
AVDD1
OUTL
AVss1
OUTR
RSEL
IOVDD
PSEL
MSEL
SSEL
191817161514
132 4 5 6 7 8 9 10 11 12 13
TP22
A
B
TP23
TP21
C727
50V1
C728
50V1
C725
1000P
C726
1000P
R718
1K
R717
1K
C754
470P
C730
0.1
C731
6.3V220
R721
100
C732
6.3V220
C733
0.1
TP20TP18
C753
470P
A
B
CN702
C743
0.1
TP17TP14TP13TP12TP8TP7TP6TP4TP2
IHGFEDCBA
S701
(REST)
TP16
C745
1000P
A
B
C
D
E
F
G
H
I
GFEDCBAABC D EFGHI
R712
220
C718
0.22
C717
0.1
C744
8200P
R709
68K
R741 47K
R711
82K
C722
10P
X701
(16.9344MHz)
C721
10P
C724
0.1
C723
10V220
IC702
MN662790RSC
SERVO PROCESSOR/
DIGITAL SIGNAL PROCESSOR/
DIGITAL FILTER/
D/A CONVERTER
+B(2)
Rch OUT
/RST
STAT
SUBQ
SQCK
BLKCK
P.GND
MDATA
MCLK
TX
+B(1)
D.GND
LD SW
A.GND
Lch OUT
RESTSW
R753
10
TP1
TP19
TP15
R742
220K
SPEED
MLD
To FL CIRCUIT(CP606) on SCHEMATIC DIAGRAM - 13
F
SCHEMATIC DIAGRAM - 2
R714
0
7.5V
3.3V
3.2V
3.3V
3.2V
0V
3.2V
0V
3.2V
0V
3.2V
0V
0V(3.1V)
3.2V
1.6V 3.2V(0V) 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V
3.2V(0V)
0V(3.2V) 0V
0V
1.6V
1V
(1.2V)
1.6V
0V
3.2V
1.6V
1.6V
3.2V
3.2V
3V
1.5V
3.2V
1.5V
3V
PLAY
1kHz, 0dB
2.2V
P-P
0.8V
P-P
F=16.9344MHz
PLAY
0.8V
P-P
PLAY
0V
3.2V
F=75Hz
PLAY
2ms. 0.1V/DIV.
0.3V
P-P
PLAY 0.1V
P-P
2ms. 0.1V/DIV.
PLAY
0V
3.2V
T 13.3ms.
PLAY
0V
3.2V
T 13.3ms.
0.5 s. 0.2V/DIV.
3.3V
2.1V
P-P
F=16.9344MHz
3.2V 3.2V
1.5V
1.6V
3.3V
PLAY
0V
3.2V
T 13.3ms.
:POSITIVE VOLTAGE LINE :CD PLAYBACK SIGNAL LINE

S
GD
S
GD
S
GD
4.7K
1 2 3 4 5
Rch
Lch
PLAYBACK
HEAD
DECK1
1
5
3
4
2
Rch
Lch
R/P HEAD
ERASE
HEAD
DECK2
1
5
3
4
2
CS1101
CS1102
TP2
TP1
R1103
15K
C1101
1000P
R1183
100K
TP6
C1193
1000P
C1103
680P
C1104
0.022
R1101
330K
R1102
100K
TP3
R1182
1
IC1102
BA7755A
R/P SELECT
VCC GND
C1183
0.47
R1189
4.7K
R1188
1K
R1195
100K
C1102
1000P
C1194
1000P R1104
15K
R1184
100K
C1177
1000P
R1179
2.7K R1181 3.3K
TP172
TP170
TP171
R1180
2.7K
C1181
0.01
C1179
0.01
C1182
50V4.7
C1180
0.01
D1175
MA111TX
C1178
1000P
Q1175
Q1176
R1178
1.2
C1176
0.047
R1177
5.6K
R1176
4.7K
L1201 1
2
3
6
5
4
C1185
4700P
C1175
35V220
D1171
MA111TX
R1173
10K
D1172
MA8047MTX
R1174
10K
C1174
50V4.7
D1174
MA8036HTX
C1184
1500P
R1172
330
R1170
1K
C1173
0.01
ERASE CURRENT
CHECK POINT
Q1173
DTC144TKA146
BIAS OSC CONT.(CrO2)
Q1101
2SJ498CDTA
HEAD SELECT
(REC:ON)
Q1103
2SJ498CDTA
HEAD SELECT
(PLAY:ON)
Q1104
2SJ498CDTA
HEAD SELECT
(PLAY:ON)
Q1102
2SJ498CDTA
HEAD SELECT
(REC:ON)
G
D
S
Q1175,1176
2SC2002KTA
BIAS OSC
Q1174
2SC2412KT96R
BIAS OSC CONT.
L1202
47 H
Q1179
2SC2412KT96R
SWITCHING
(BEAT PROOF)
Q1171
2SD1302STA
SWITCHING
(REC:ON)
MECHANISM CONTROL CIRCUIT
B
SCHEMATIC DIAGRAM-3
TP4
TP5
TP11
TP12
24.9V
((0.1V)) ((0V))
((0V))
((0V))
0.7V
0.6V ((0V)) ((0V))
((0V))
0.6V 0.9V
((0V))
((0V))
0.6V
0.6V
4.8V
((0V)) ((0V))
((7.8V))
10.8V
0.1V
((0V))
((0V))
((4.4V))
4.5V
((0V))
((0V))
((0V))
4.5V
((0V))
((0V))
((0V))
((0V))
((0V))
((4.4V))
0.1V
14.6V
:TAPE PLAYBACK SIGNAL LINE
:RECORDING SIGNAL LINE
:POSITIVE VOLTAGE LINE
((14.7V))
14.3V
((0.1V))
0V
((0V))
0.1V
((14.7V))
14.3V
((0V))
0.1V
((4.8V)):CrO2

14
3233343536 29 28
30
31 27 26 25 24 23 22
47K
7 98654
21
10 11 12 13 15 16 18
19
47K
10K
10K
1
MOTOR
M
1 32
20
Q1107
DTC144TKA146
P.B EQ/REC EQ
(CrO2/H.SPEED)
R1131
68K
C1146
16V10
R1146
10K
C1135
1000P
C1139
50V2.2
C1131
820P
C1129
820P
R1125
1K
R1123
10K
R1121
33K
C1133
50V4.7
C1143
50V4.7
R1115
390K
R1117
270K
C1127
0.01
C1123
1800P
C1125
0.047
C1121
50V1
C1119
50V4.7
AB
C1117
50V1
C1147
1500P
R1141
6.8K
R1111
2.2K
C1115
0.033 R1109
4.3K
C1113
6.3V220
R1107
39
C1111
820P
C1109
16V100
C1108
16V33
C1105
1200P
R1105
270
IC1101
M51167AFP-TB
P.B EQ/REC AMP/
ALC/TPS AMP
C1106
1200P
C1112
820P
R1142
6.8K
R1110
4.3K
R1108
39
C1114
6.3V220
C1148
1500P
R1112
2.2K
C1116
0.033 C1124 1800P
C1122
50V1
C1120
50V4.7
C1118
50V1
EDC
C1126
0.047
C1136
1000P
R1118
270K
C1128
0.01
R1116
390K
C1130
820P C1132 820P
C1144
50V4.7
R1122
33K
R1124
10K
R1126
1K
C1140 16V10
C1141 50V0.1
R1134 470K
C1142
0.022 R1133
3.3K
C1134
50V4.7
Q1108
DTC144TKA146
P.B EQ/REC EQ
(CrO2/H.SPEED)
A
B
C
D
E
F
2
R1206
220
Q1203
2SD965RTA
MOTOR DRIVE W1200
A
B
Q1206,1207
2SB621RTA
SOLENOID DRIVE
Q1206
Q1207
R1221
2.7
R1225
2.7
C1201
16V100
Q1208
Q1209
R1226
1K
R1227
1K
D1202
MA111TX
D1201
MA111TX
Q1208,1209
DTC114TKA146
SOLENOID DRIVE
AGND
TPS
R/P
REC
SW
REC
ALC
C
B
PRE
PRE
PB
PB
A
C
B
A
B
C
AGC
OFF
Vcc
17
R1132 3.3M
SCHEMATIC DIAGRAM-4
((0V)) ((0V))
((0V)):CrO2
((0V))
4.7V ((9.7V))((4.3V))((0V))((5V))((5.2V))((4.9V))((5.1V))((4.8V))((4.8V))((1.1V))((0V))
((9.9V))
((9.4V))((0V))
((0V)) ((4.7V)) ((0V)) ((1.1V))((4.8V)) ((4.8V)) ((5.1V)) ((5.1V)) ((4.9V)) ((5.2V)) ((5.0V)) ((0V)) ((4.1V))((0V)) ((5.1V))((0V))
4.8V
((0V))
((0V))
((0V)):CrO2
14.6V 14.6V
10V
5V
10V
((0V))
((0.8V))
((0V))
((10V))
((10V))
((0V))
((9.5V))
((9.5V))
((9.5V))
((9.5V))
((4.5V))
((4.5V))
((5V))
((5V))
:TAPE PLAYBACK SIGNAL LINE:RECORDING SIGNAL LINE:POSITIVE VOLTAGE LINE
((5.4V)) 3.8V4.9V4.9V
4.6V5.0V4.8V4.8V 4.4V 4.5V
((0V))
9.1V
4.9V
4.6V
((5.4V))
5.0V
4.8V
((5.1V))
4.8V
4.5V4.5V
9.3V
8.8V