Panasonic SA-AK88 User manual

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Service Manual
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ORDERNO.MD0007118C3
CDStereoSystem
lSA-AK88
Colour
(S)...SilverType
Area
(GC)... Asia,LatinAmerica, Africaand MiddleNearEast
TAPESECTION
AR2 MECHANISM SERIES
CDSECTION
RAE0152Z-3 TRAVERSEDECKSERIES
Specification
AmplifierSection
Frontspeakerpoweroutput
Poweroutput
PMPO2400W
RMS poweroutput
THD 10%,bothchannels
driven
Total140 Wperchannel(6 )
LOW100 Wperchannel(6 )
HIGH40Wperchannel (6 )
PoweroutputinDolby Pro Logicmode
PMPOTotal2800W
RMS poweroutput
THD 10%
Total360 W
FrontLOW100 Wperchannel(6 )
FrontHIGH40Wperchannel (6 )
Center40W(8 )
Surround 20Wperchannel (8 )
Inputsensitivity
AUX250 mV
MIC0.7mV
Inputimpedance
AUX13.9k
MIC680
FM TunerSection
Frequencyrange87.50-108.00MHz(50 kHzstep)
Sensitivity2.5μV(IHF)
S/N26 dB2.2μV
Antennaterminal(s)75 unbalanced
AM TunerSection
Frequencyrange522-1629kHz(9kHzstep)
520-1630kHz(10kHzstep)
Sensitivity
S/N20 dB560μV/m
Cassette DeckSection
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8.2HowtoentertheSelf-DiagnosticFunction
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1.Turntheunit on with no cassetteinthedeck. (Selectthetapefunction)
2.Pressand holdthe“STOP/TUNEMODE”button foratleast2seconds.
3.Whilepressingthe“STOP/TUNEMODE”button, press“FF/MEMORY”button foratleast2
seconds.
4.“T”willappearon theFLdisplay. (unit isin theSelf-DianosticFunction)
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8.3CassetteMechanism Test(Forerrorcode
H01,H02,H03,F01,F02)
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1.Press“TAPE,DECK1/2”toselectDeck 2.
2.Loadacassettetapewiththeerasureprevention tab,removefromleftsideonlyand closethe
cassetteholder.
3.Press“FASTFORWARDMEMORY/NEXT”(Tapewill bestop after2seconds)
4.Loadacassettetapewiththeerasureprevention tab,removefromrightsideonlyand closethe
cassetteholder.
5.Press“REVERSEFMMODE/BP/PREV”(Tapewill bestop after2seconds)
6.Loadapre-recordedtapewithbothsiderecordtabsintactand closethecassetteholder.
7.Press“PLAY TUNE/TIMEADJSELECT”(AfterTPSfunction,tapewillstop automatically)
8.Press“REC/STOP”(Tapewill notmove)
9.Press“STOPTUNEMODE”toindicateErrorcode.
¡Ifseveralproblemexist,errorcodewillchangeeachtimewhen“TUNE
MODE/PBC”ispressed.
(e.g. H01 H03 F01 .....etc.)
10.Press“TAPE,DECK1/2”toselectDeck 1.
11.Repeatstep2to9 totestDeck1.(TapeDeck1will notcheck H02 becauseofno recording
function)
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8.4CD Mechanism Test(F15,F26,F16,F17,
F27,F28,F29,H15,F75)
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1.Press“CD”.
2.Press“CDMANAGER”.
3.Press“TUNEMODE”toindicateErrorCode.
¡Ifseveralproblemexist,errorcodewillchangeeachtimewhen “STOPTUNE
MODE”ispressed. (e.g. F15 F26 F16 .....etc.)
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8.5Toclearall Errorcode
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1.Press“STOPTUNEMODE/PBC”button for5seconds.
2.FLindicatorshows“CLEAR”for1second and changeto“T”.
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8.7PowerAmplifierFailure(F61)
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1.Whenpoweramplifierfail,F61 willindicateautomatically.
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9.1ErrordetectionforCassette Mechanism
block
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No. ErrorErrorDisplay Problemcondition
1MODESWdetection errorH01 Faultyoperation of cassette mechanism.Faultycontact or short-circuit ofmechanismmodeswitch(S951,
S971).
2RECINHSWdetection
error H02 Recording notpossible.Faultycontactor short-circuit ofRECINH switch(S974,S975).
3HALFSWdetectionerror H03 Playbackcannotperform.Faultycontactorshort-circuit ofHALFsiwtch(S952,S972).
4ReelPulsedetection errorF01 Thetapeadvancesslightlyandthenstops.Faultyreel pulse,faultyholedetectIC (IC951,IC971).
5TPSabnormal F02 Cassette deckwillnotperformTPSfunction.FaultyplaybackEQ/recording amplifierIC(IC101).
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9.2ErrordetectionforCD/Changerblock
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No.ErrorErrorDisplayProblemcondition
1RESTSWdetection errorF15 CDdoesnotfunction.Thiserror occurswhentheOptical PickUpRESTSW(S701)isnot
detectedwithinthespecifiedtime(about8seconds)
2CDtrayopensautomaticallyF16 CLAMP switch(S4)NG(Check&Replace)
3Doesnotstartup when[PLAY]buttonis
pressed F17 BOTTOM switch(S5) NG (Check&Replace)
4Transmissionerror betweenCDservoLSI
andmicon F26 CDdoesnotfunction.Thiserror occurswhenthePOWERisON for theCDblockandan erroris
detectedafterthetransmissionhasstarted.
5StartupfailsevenwhenyouinsertCDor
theselecteddisctray
doesnotopen
F27 Tray1detect switchor Tray2detect switchNG (Check&Replace)
6CannotinsertCDF28 Tray1detect switchNG (Check&Replace)
7CannotejectCDF29 Checkifdiscisstuck. Tray2detect switchNG (Confirm&Replace)
8CDpowererrorF75 CDdoesnotfunction.CheckifCDRSTisHfor SELECTORat CD.IfitisnotHafter1
second,itshallbememorisedasanerror.(IC702)
9TheCDtrayclosesH15 CDdisctraydetectswitchNG (S3)(Check&Replace)
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9.3PowerSupply relatederrordetection
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No.ErrorErrorDisplayProblemcondition
1POWERAMPoutput
abnormal F61 WhenPOWERisswitchedon,powerbecomeoffautomatically.During normal operation,ifDCDET becomeL,PCNTshall become
Landtheerror displayon theleftshall bedisplayed. (IC501)
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10 CD TestModeFunction
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ThisCDtestmodeisprovidedtocheck CDunit withoutconnectingto changerloadingmechanism.
Thismodeshall operateCDPLAYwithCDunitbeingconnectedonlyand CDAutomatic
Alignmentresult isshownon FLdisplay.
10.1HowtoentertheSelf-DiagnosticFunction
10.2CDAutomaticallyAdjustmentresult indication
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10.1HowtoentertheSelf-DiagnosticFunction
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1.Turntheunit on and selecttheCDfunction.
2.Pressand holdthe“STOP/TUNEMODE”button foratleast2seconds.
3.Whilepressingthe“STOP/TUNEMODE”button, press“FF/MEMORY”button foratleast2
seconds.
4.“
”willappearon theFLdisplay. (unit isin theCDtestmode)
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10.2CD AutomaticallyAdjustmentresult
indication
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UnderCDtestmode,pressingthenumerickey‘0’on theremotecontrollerwill displaytheauto
adjustmentresult.FLOCK,TLOCKand CLVSstatusshall beshownasbelow:
Duringtheabovedisplay,executingCDPLAY will displayautoadjustmentresult forCDPLAY
mode.
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16.1CD servo circuit
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8
19
73
1
15
44
44
75
59 58 78
80
64
3
E
E
A
B26
24
16
23
2
a
b
67
4
106
110
110
3
111
6
CCN1000
IC1000
MPEG
VIDEO
AUDIO
DECODER
IC702
DSP
IC701
SERVO
IC401
SYS CONT.
LCD D
A4
BC
A
X701
16.9344MHz
X1000
27MHz
Sub-code
Q data
L ch
R ch
17
Audio signal
output
Video signal output
CD-DA/ VCD
(AUDIO&VIDEO) Clock lineVCD(VIDEO)CD-DA/ VCD(AUDIO)
IC1003
INVERTER
5
Circuit diagram
DATA SIGNAL LINE WAVEFORMS Note:
Use the PVCD-K06 video CD test disc (menu playback feature is available on version
2.0). For color bar display, play back the 1st track when the menu playback feature is
used, or the 3rd track when the feature is not used.
IC702 IC1000 CD serial data input
67
DIC1000 Video signal output
(blue back screen) IC702 , Audio signal output
73 75
E
IC1000 Audio serial data output
ARF signal T=0.354 s(F=2.822MHz) T=0.48 s(F=2MHz)
PLAY X:0.5 s
Y:0.023Vx10 PLAY X:0.2 s Y:0.2Vx10
T=1 s(F=1kHz)
PLAY X:0.2 s
Y:0.2Vx10
PLAY X:1 s
Y:0.1Vx10
H signal(PLAY, X:10 s, Y:0.1Vx10)
V signal(PLAY, X:5 s, Y:0.1Vx10)
(color bar screen)
H signal(PLAY, X:10 s, Y:0.1Vx10)
V signal(PLAY, X:10 s, Y:0.1Vx10)
Test disc played at 1kHz, 0dB
(1st track SZZP1056C)
0.8V 3.2V
1.2V
0.6V
0.6V
2.4V
1.2V
6.2V
8 s
8 s 8 s 8 s 8 s
8 s
63.5 s
16.7 s
63.5 s
16.7 s

MASTER CLOCK SYSTEM WAVEFORM AUDIO DATA CLOCK SYSTEM WAVEFORM
ba A
Video read clock Write reference clock Audio bit clock
2.4V
T=0.037 s T=0.354 s T=0.5 s
3.0V 6.2V
F=27MHz F=2.822MHz F=2MHz
Diagnostic Procedures by Symptom
Symptom
CD-DA Video-CD Likely Location Fault
TOC NG
Turntable fails to rotate.
Turntable rotates.
Audio normal
Audio normal
TOC OK, counter OK, but no
sound
TOC NG (both audio and video
are NG.) Blue black display.
Fails to rotate.
Rotates.
Audio normal, Video NG.
No sound, Video NG.
TOC OK, counter OK, but no
sound and video NG.
ForTOC NG, fault in the CD servo circuit.
IC701, IC702, IC703, or traverse system.
Traverse system, focus servo system (IC701,IC703), supply
line, clock line system control.
Traverse system, tracking servo system/ CLV servo system/
traverse servo system (IC701, IC702, IC703)
IC1000
IC1000
CD disc other than DV “Karaoke” soft, video CD and CD-DA.

Troubleshooting
Procedure1 CD-DA No sound
CD-DA: Compact disc digital audio(convertional CD only with audio tracks)
Troubleshooting flowchart
(Check) (Check)
Are the following waveforms present at pins and of
IC702 when the 1kHz, 0dB portion of the 1st track on test disc
SZZP1056C played back?
Press the SELECT( ) button to start playback.
Press the SELECT( ) button to start playback.
Press the STOP( )button to stop playback.
Load a CD-DA disc.
TOC display normal?
(Are track No. and time displays normal?)
Does sound dropout occur?
Check pin of IC702 or pin of CN1000.
Constant low(0V)
level 0V The following waveform is observed either
intermittently constantly during playback.
2.4V
1 s
3.2V
6 s 6 s
IPFLAG
7573
Taverse deck. IC701, IC702
Refer to “Troubleshooting guide”
on 18.1. CD servo circuit.
Faults is in the traverse deck
or main board (servo block).
IC702
IC801, Q801, Q802,
headphones jack, etc.
NO
YES
NO
NO
YES
YES
Normal
(go to procedure 2-1)
Likely location of fault
64 26

Troubleshooting
Procedure2-1 Video CD No picture or No sound
Troubleshooting flowchart
(Check) (Check)
Load a video CD disc.
TOC display normaly? (Are track
No.and time displays normal?)
Does the menu appear on screen?
Check the waveforms at pin of IC702 or
pin of CN1000.
Image noise or unstable picture.
Is the sound unstable?
Video line Audio line
Constant low(0V)
level 0V The following waveform is observed either
intermittently constantly during playback.
3.2V
3.0V
3.2V
23 s
T=0.36 s
T=0.36 s
23 s
Are the following waveforms present at pins , of CN1001?
2410
Traverse deck. IC701, IC702
Faults is in the traverse deck
or main board (servo block).
IC1000
Press the SELECT( ) button to start playback.
NO
NO
NO
NO
YES
NO
YES
YES
YES YES
Normal
Press the STOP( )button
to stop playback.
Press the menu(+, - ) to select the menu.Press
the select ( ) to start playback.
10 CDDATA
24 CDSCK
Procedure 2-3 Procedure 2-4
Not connected to TVConnected to TV
Likely location of fault
64
6

Troubleshooting
Procedure2-2 Video CD blue back No blue back
Troubleshooting
Procedure2-3 Video portion of video CD No picture
Troubleshooting flowchart Likely location of fault
Troubleshooting
Procedure2-4 Audio portion of video CD No sound
Troubleshooting flowchart Likely location of fault
Press the SELECT( ) button to start playback.
Press the STOP( )button to stop playback.
Load a video CD disc.
Does blue-back screen appear?
Is the following waveform present at pin of CN1000?
NO
NO
YES
NO
YES
YES
Normal
0.5V
0.5V
T=63.5 s
T=16.7 s
6.2V
T=0.5 s
Faults is in the main board
(video output block)
IC1000
Likely location of fault: IC1000
Is the following waveform present at pin of IC1000?
Audio signal line
IC1000
IC702
2
110

CS1102
CS1101 S
G
D
S
GD
S
G
D
S
GD
R ch
L ch
PLAYBACK
HEAD
DECK1
1
5
3
4
2
R ch
L ch
R/P HEAD
ERASE
HEAD
DECK2
1
5
3
4
2
A
B
C
D
E
F
Q1173
DTC144TKA146
BIAS OSC CONT.(CrO2)
2 31 4 5
GNDVcc
IC1102
BA7755A
R/P SELECT
Q1101
2SJ498CDTA
HEAD SELECT
(REC:ON)
Q1103
2SJ498CDTA
HEAD SELECT
(PLAY:ON)
Q1104
2SJ498CDTA
HEAD SELECT
(PLAY:ON)
Q1102
2SJ498CDTA
HEAD SELECT
(REC:ON)
R1182
1
TP11
TP12
TP170
TP171
TP172
R1176
4.7K
D1172
MA8047MTX
R1174
10K
C1174
50V4.7
D1171
MA111TX
R1173
10K
4
5
6
D1174
MA8036HTX R1172
330
R1170
1K
C1173
0.01
Q1179
2SC2412KT96R
SWITCHING
(BEAT PROOF)
C1184
1500P
C1185
4700P
C1183
0.47
3
2
1
L1201
C1176
0.047
C1175
35V220
R1188
1K
R1189
4.7K
Q1171
2SD1302STA
SWITCHING
(REC:ON)
R1177
5.6K
D1175
MA111TX
C1182
50V4.7
Q1174
2SC2412KT96R
BIAS OSC CONT.
(CrO2)
R1181
3.3K
R1180
2.7K
R1179
2.7K
C1181
0.01
C1180
0.01
C1177
1000P
C1179
0.01
C1178
1000P
R1178 1.2
Q1175,1176
2SC2002KTA
BIAS OSC
Q1175
Q1176
TP5
TP4
TP2
TP1
R1184
100K
C1102
1000P
R1104
15K
C1194
1000P
R1195
100K
C1103
680P
C1104
0.022
R1101
330K
R1102
100K
TP6
C1193
1000P
R1183
100K
C1101
1000P
R1103
15K
TP3
DECK CIRCUIT
SCHEMATIC DIAGRAM-5
L1202
47 H
:TAPE PLAYBACK SIGNAL LINE
:TAPE RECORDING SIGNAL LINE
:POSITIVE VOLTAGE LINE
((8.3V)) ((0V)) ((0V))
11.1V 4.9V
((0V))
((0V))
((0V))
((0V))
((0V))
((0V))
((0V))
((0V))
0V
((4.2V))
0V
((4.4V))
0V
((4.4V))
0V
((4.2V))
0.6V
((14.8V)) ((0V))
((0V)) 0.6V
((0V))
((14.8V))
((0V))
0.7V
((0V))
0.6V
((0V))
0.6V ((0V))
((4.8V)):CrO2
((0V))
0.7V
((0V))
((0V))
((0V))
26.4V
((0V))
14.8V
ERASE CURRENT
CHECK POINT

Q1108
DTC144TKA146
P.B EQ/ REC EQ
(CrO2/ H.SPEED)
Q1107
DTC144TKA146
P.B EQ/ REC EQ
(CrO2/ H.SPEED)
36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 18
Vcc
TPS
SW
17
ALC
GND
B
C
A
REC
PRE
REC R/ P
PRE
PB
PB
B
A
C
A
B
C
AGC
OFF
CA
E
DB
A
B
C
D
C
D
B
A
E
F
SCHEMATIC DIAGRAM-6
C1106
1200P
C1112
820P
R1108
39
C1114
6.3V220
C1116
0.033
R1142
6.8K
R1110
4.3K
R1112
2.2K
C1118
50V1
C1148
1500P
C1122
50V1
C1120
50V4.7
C1124
1800P
C1126
0.047
C1128
0.01 R1118 270K
R1116
390K
C1132
820P
C1130
820P
R1126
1K
C1144
50V4.7
R1124
10K
R1122
33K
R1146
10K
R1121
33K
C1143
50V4.7
C1127
0.01 R1117 270K
R1115
390K
C1131
820P
C1129
820P
R1123
10K
R1125
1K
C1146
16V10
C1135
1000P
C1139
50V2.2
R1105
270
C1105
1200P
C1108
16V33
C1109
16V100
C1111
820P
C1113
6.3V220
R1107
39
C1115
0.033
R1141
6.8K
R1109
4.3K
R1111
2.2K
C1147
1500P
C1123
1800P
C1119
50V4.7
C1121
50V1
C1125
0.047
C1136
1000P
C1134
50V4.7
C1133
50V4.7
R1133
3.3K
C1142
0.022
R1134 470K
C1141 50V0.1
R1132 3.3M
C1140 16V10
IC1101
M51167AFP-TB
P.B.EQ/ REC AMP/
ALC/ TPS AMP
R1131
68K
C1117
50V1
:TAPE PLAYBACK SIGNAL LINE
:TAPE RECORDING SIGNAL LINE
:POSITIVE VOLTAGE LINE
((4.8V)):CrO2
((0V)) ((0V))
((4.8V)):CrO2
((0V)) ((0V))
((0V)) ((4.6V)) ((0V)) ((1V)) ((4.6V)) ((4.7V)) ((4.9V)) ((4.9V)) ((4.7V)) ((5V)) ((4.8V)) ((0V)) ((0V)) ((0V)) ((4.2V)) ((5V))
4.9V
((0V)) ((9.1V)) ((9.7V)) ((0V)) ((1V)) ((4.6V)) ((4.7V)) ((4.9V)) ((4.7V)) ((5V)) ((4.8V)) ((0V)) ((4.7V)) ((0V)) ((9.6V))
4.3V
14.8V