Kenwood KAC-8104-D Service manual
CLASS D MONO POWER AMPLIFIER
KAC-8104D
SERVICE MANUAL
© 2007-11 PRINTED IN JA PA N
B53-0602-00 (N) 519
Fuse (40A)
(F52-0016-05)
FUSE[40A] P.CON
POWER IN
SPEAKER OUTPUT
BASS BOOST
LEVEL[dB]
LPF
FREQUENCY[Hz]
OFF 15Hz
ISF
25Hz
[MIN] [MAX]
INPUT
SENSITIVITY[V]
LINE IN LINE OUT
SP LEVEL INPUT
SIGNAL SENSING
TURN-ON
Dressing Panel
(A21-6631-02): (E,K type)
(A21-6632-02): (M type)
E,K type
M type
Accessories
(W01-1606-05)
Screw & wrench key set
(N99-1820-05)
This product complies with the
Connecting cord assy
(E30-6145-05)
19cm
This product uses Lead Free solder.
RoHS directive for the European market.
2
KAC-8104D
L.P.F
QERF
SEL.
)zH002∼05(
Q603
zH04=QERF
IC15
ssaB
tsooB
LEVEL
Bd81∼0
TTA
L
5V)
∼
LINE IN
0.2
R
(
IC11
PMA-OSI
L
LINE OUT
R
IC14
S.F.I
zH51
zH52
I.S.F
SEL.
SENS.
VOL
IC14
IC18
F.P.L
Q151
ETUM
+
L
-L
-R
+R
SP INPUT
IC32
IC31
GNIMMUS
PMA
IC12,13
DAED
EMIT
Q401,402,404,417
LEVEL
TFIS
IC32
ELGNAIRT
EVAW
Q400
FN
PMA-D
FFO/NO
Q405-409,
414,415
Q410-413
EVIRD
LANIF
TEF-SOM
RETLIF CLPMOC
SP
OUTPUT
KAC -8104D
300W / 4Ω
500W / 2Ω
ILLUMI
INDI.
POWER
INDI.
BLOCK DIAGRAM
IC61,62,64 Q608-611
50
40
30
20
10
0
ISOLATION
INPUT
LEVEL DIAGRAM
FILTER
VOL
LEVEL
D class AMP
Q25,26,28,42 Q416
15V
RVA
SP
OUT
B
BH+
RVA
Q51,52
DAOLREVO
TED
IC1
Q3
Q1,2
LANGIS
ROTCETED
LAMREHT
TED
CD/CD
NOC
REWOP
TESFFO-CD
TED
P- CON
RETLIF CL
BATT.
GND
FFO/NO
NOC-P
YTIROIRP
KAC-8104D
COMPONENTS DESCRIPTION
AUDIO UNIT (X09-8730-10)
●
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 DC/DC converter IC Generates drive signal for switching component
IC11 Isolation amplifi er Isolates noises caused by potential differences in GND
IC12,13 NAND
IC14 INFRA SONIC FILTER Cuts off ultra low frequency of audio signal
IC15 BASS BOOST Bass boost (Variable level)
IC18 LOW PASS FILTER Cuts off high frequency of audio signal
IC31 (1/2) Triangular wave generation Generates reference signal for digitalizing analog signal
IC31 (2/2) Comparator Digitalizes by comparing analog signal with triangular waves
IC32 (1/2) Triangular wave generation Generates reference signal for digitalizing analog signal
IC32 (2/2) Error amplifi er Compensates errors by feedback from the output
IC60 Attenuation circuit to attenuate input signal by 1.5dB Attenuates output when temperature in the set becomes too high
IC61,62,64 Resonance detecting circuit
IC63 Comparator
Q1-3 PCON switch Turns on the circuit when ON signal is applied to the PCON circuit
Q4,5 Mute Generates mute drive signal and turns off LED
Q6 DC/DC converter ON/OFF control Turns off DC/DC converter when protection is detected
Q8-11 Gate driver Gate driver in DC/DC converter FET
Q12,13,19,20 DC/DC converter DC/DC converter switching
Q25,26,28,42 AVR ±15V AVR
Q29,30 Tracking when ±15V AVR is turned OFF Matches the trailing edge of “-15V” AVR with that of “+15V” AVR
Q37,38 DC/DC converter pulse ON/OFF control ON or OFF of DC/DC converter drive waveform
Q51,52 AUTO Pcon Sends DC voltage from SP IN to Pcon control circuit
Q151 Mute Turns off audio signal
Q400,403 D-class amplifi er switch Turns on or off D-class amplifi er
Q401,402
Q404-409,414
Q415,417
Q410-413 Power amplifi cation High-current switching in D-class
Q416 HB 15V AVR Stacking AVR to obtain High+B for D-class
Q600,601 Resonance detecting circuit
Q602,612 Protection Turns off DC/DC converter when protection is detected
Q603 Attenuation circuit to attenuate input signal by 1.5dB Attenuates output when temperature in the set becomes too high
Q604-607 Current-voltage conversion
Q608-611 Latch circuit Detects over voltage in output and retains the current
Q900 FAN drive Limit FAN power supply voltage under the rated voltage
Pulse amplifi cation, shaping and level shift Generates the signal that drives the D-class fi nal FET
Generates and shapes the inverted waveform and to create dead time
in D-class section
Detects short in SP output circuit, measures over current in the circuit,
and activates protection operation
Controls D/D CON and D-class On/Off with the over current detection
and Pcon control signals
Detects short in SP output circuit, measures over current in the circuit,
and activates protection operation
Converts current to voltage to detect over current and sends it to the
comparator
3
A B C D E
Q
D151
Q25
0
1
D5
W71
R7
C
R
3
3
R
0
4
5
P
T
1
KAC-8104D
1
PC BOARD (FOIL SIDE VIEW)
AUDIO UNIT
X09-8730-10 (J76-0470-01)
W101
Q413
W91
W88
D3
R427
R428
W336
Q416
EB
D406
D403
R421
D407
D404
D405
W94
W324
W90
EB
Q607
R626
Q604
2
R625
EB
R623
CN900
C900
12
R624
C610
Q605
EB
TP139
Q606
EB
D900
C611
R627
R48
C901
C25
TP133
TP134
Q410
SDG SDG SDG SDG
R419
W138
W139
TP132
TP131
R425
D19
W159
W158
TP26
W141
3
D18
TP25
Q12
GDS
W157
R31
R30
TP129
GDS
4
Q13
Q19
R33
GDSGDS
TP130
R32
Q20
W500
5
TP125
D13
R16
TP48
R15
TP97
TP98
C10
TP95
TP96
6
TP94
TP93
TP88
R37
Q8
W162
R39
BE
Q10
R27
TP39
R24
BE
R29
Q6
TP41
16
C7
W160
W332
R18
TP69
C11
W161
C13
C12
W334
TP87
TP91
TP90
TP92
TP42
W152
W154
C19
R45
W156
W153
R43 R44
R41
R38
TP77
BE
BE
Q11
BE
Q37
TP76
IC1
1
W331
R20
TP72
R19
R22
R23
C24
W163
W164
W165
D17
TP71
P3
W149
TP59
W150
TP89
W330
R28
R40
W142
W144
W145
W147
W328
9
8
C16
C17
C18
W146
R42
BE
R26
BE
R21
C1
W327
TP58
TP78
Q9
TP75
Q38
C42
R17
W151
C14
W326
TP85
W140
TP86
W325
R25
TP82
TH1
TP84
TP136
TP138
TP74
TP81
TP70
TP137
TP73
TP135
TP67
TP68
C26
R49
L3
L1
D1
D2
R1
TP23
R415
J3
W136
W134
W137
W133
W135
Q412
R426
W132
W131
W108
W129
W125
W128
W126
R203
C20
C195
W124
TP22
R418
W123
TP12
W121
W122
D14
C401
C118
W118
C21
R47
R46
C41
TP49
W115
C119
R906
W112
Q411
P1
W98
W99
C116
W117
W119
W120
L2
C100
C197
W109
R424
C198
R416
W105
TP21
P2
R423
W80
C40
W81
TP1
Q409
C15
EB
TP2
R412
R417
Q408
W82
W335
W322
W323
C404
TP33
R422
C402
C403
W85
TP128
R10
W83
TP613
C613
R638
W79
R618
R620
R658
W75
W87
W89
W92
W86
W320
W84
VR3
B.B
R414
R420
Q415
EB
Q405
D901
D16
W78
R6
R9
TP34
C3
Q609
Q610
R644
W321
R659
TP53
IC60
58
C221
C218
R235
EB
EB
C902
R900
W77
Q3
D6
W319
BEBE
R643
R639
TP36
D605
TP55
R636
C601
14
TP201
W76
C224
R52
R411
TP56
R902
W74
W31
8
1
W73
R53
R409
W72
EB
D7
D8
Q61
W317
W69
C22
R231
IC15
R234
R233
Q4
R11
BE
C612
W31
EB
B
R5
TP
R8
C4
BE
R642
T
R6
C121
W
7
4
JIHGF
C
C3
KAC-8104D
1
TP103
TP101
Q26
C40
R52
415
EB
R411
EB
5
C902
R900
R902
W74
W77
Q3
6
D6
W319
609
W31
BE
4
R643
R639
TP36
D605
TP55
R636
TP56
59
53
C601
1
60
8
C221
5
W76
TP201
C224
14
EB EB
BE
R53
Q25
Q404
R406
Q401
BE
R409
EB
BE
R402
R410
D400
R405
Q400
Q900
BE
W72
W67
W65
W68
R74
W71
W58
Q5
C2
R3
R7
R5
W69
W73
EB
D7
D8
Q611
W317
C220
R231
IC15
R234
R233
BE
TP127
R8
C4
R11
C612
R637
W316
W314
BE
C615
R642
TP608
C121
R214
TP609
58
TP64
D5
TP65
W315
Q4
D151
R12
R646
VR2
C614
Q608
C625
R152
R230
C217
TP47
D613
W70
R641
BE
R208
TP200
LPF
D9
TP126
D606
W309
W59
W60
C208
BE
TP610
W66
W61
R226
C184
R403
R401
R13
D10
C5
BE
R209
R223
BE
W64
TP117
TP116
W63
R14
C6
R73
R640
Q151
BE
TP151
Q407
W54
W311
W312
D12
Q612
W62
R163
TP54
Q28
TP100
TP99
TP51
TP29
BE
R400
R413
R408
Q417
BE
Q403
R440
TP37
EB
R407
W57
R4
Q2
R652
R151
R224
R225
C212
C214
TP35
25/15/OFF
BE
BE
W56
W310
R222
R404
Q402
W37
W46
W47
W36
W38
W39
TP122
D11
Q602 D610
W43
BE
D611
R655
TP18
W41
Q1
R441
R2
W308
D4
W48
W49
D600
W50
W51
W52
R629
R634
W44
C151
Q603
R653
BE
R154
R155
R156
R153
C152
R160
W55
R161
TP154
C155
W45
TP60
C216
R213
IC18
C215
145814
W306
R219 R206
C211
C209
C207
R221
R220
VR1
W53
W307
IFS
S3
EB
Q42
Q414
EB
W40
EB
Q406
W34
W35
W27
TP50
TP124
R645
R654
8
D612
C631
IC63
14
R649
TP19
R648
R647
R651
W304
R630
TP181
TP185
IC13
8
TP8
C620
TP38
TP63
TP301
C303
W305
IC32
58
TP153
C154
TP152
R158
R157
C205
R211
W337
C213
IC14
TP14
TP15
TP32
R217
SENS
TP118
5
R159
C156
W903
R218
R207
C619
R650
17
14
C618
14
C202
58
R216
R607
TP6
R632
R301
TP155
TP13
TP27
TP24
TP16
TP302
W33
C608
R635
W303
C622
TP9
R633
W32
R162
TP306
R205
C210
C621
TP5
C634
TP10
TP7
R303
TP106
R617
D608
R606
C200
C201
W31
TP108
R58
R57
C35
W28
D23
C31
C609
R619
R622
58
IC64
14
TP20
D607
C607
W21
W22
R612
C604
W23
W25
W24
W93
TP186
W302
TP303
C305
IC31
58
TP304
C304
R309
W30
R204
W26
W29
R100
J1
D101
C117
TP104
C36
C32
TP28
TP31
R621
C623
C616
R656
R657
TP119
C630
W18
C636
TP62
R601
Q601
BE
D601
TP4
R605
R615
C603
R614
R616
C633
IC61
R610
5
R609
R611
TP17
71
IC12
8
R183
R442
C183
C182
D182
R307
R306
D303
R304
14
C306
TP305
R122
R308
R302
C112
TP111
R123
C111
R119
R120
TP112
IC11
W20
W19
14
R116
C110
TP110
W1
R114
R113
R103
R105
TP109
R106
C104
R104
R102
TP102
TP57
TP83
TP80
D25
R628
C624
D609
58
IC62
14
R600
D604
TP140
Q600
R608
BE
R613
14
W16
8
C635
14
R184
D183
D305
D304
TP52
R121
R117
C113
58
C109
R115
W301
C103
C101C102
W17
R101
TP115
W15
TP79
C617
R602
C600
D186
TP40
W9
R604
C632
R182
D181
W10
TP114
R61
BE
TP11
R631
TP61
D603
TP184
C114
C115
D104
R65
R603
C602
W14
TP12
W7
W8
TP113
-15V
W12
TP3
D602
TP183
R181
W13
D103
R111
TP107
Q29
BE
W3
W4
W5
W6
W11
W300
C107
TP66
R305
D107
R109
TP105
R67
R66
R64
W2
TP46
R107
10
Q30
C181
9
D53
TP30
D108
C105
TP45
D52
TP43
C52
R56
R55
TP44
R59
R108
Q51
1
2
BE
C106
R110
Q52
R54
C53
R112
J2
TP120
TP121
BE
D51
C108
X09-8730-10
Ref. No. Address Ref. No. Address
IC1 6B Q51 6H
2
IC11 5G Q52 6H
IC12 4G Q151 5F
IC13 4G Q400 3F
IC14 6G Q401 2F
IC15 6F Q402 3F
IC18 6F Q403 2F
IC31 5G Q404 2F
IC32 5G Q405 3E
IC60 5E Q406 3G
IC61 4G Q407 2F
3
IC62 3G Q408 2E
IC63 4G Q409 2E
IC64 3G Q410 2C
Q1 4F Q411 2D
Q2 4F Q412 2D
Q3 4E Q413 2E
Q4 4F Q414 2G
Q5 4F Q415 2E
Q6 5B Q416 4E
Q8 5B Q417 2F
4
Q9 5B Q600 3G
Q10 5B Q601 3G
Q11 5B Q602 3F
Q12 3B Q603 5F
Q13 4B Q604 2B
Q19 4B Q605 2B
Q20 5B Q606 2B
Q25 2F Q607 2B
Q26 2F Q608 5F
Q28 2F Q609 4E
5
Q29 2H Q610 4E
Q30 2H Q611 4F
Q37 5B Q612 4F
C51
Q38 5B Q900 3F
Q42 2G
R51
6
Refer to the schematic diagram for the values of resistors and capacitors.
7
5
A B C D E
1
0
1
W
SW5V
1
2
KAC-8104D
1
2
SPEAKER
LEVEL
INPUT
3
4
5
6
LINE IN
LINE OUT
L
R
(X09-8730-10)
J1
RL
J2
10
9
8
7
6
5
4
3
2
1
TP46
R107
TP45
TP44
R108
TP43
D101
2.2K
2.2K
BODY-GND
0.01
C117
C105
R109
10u50
47K
+
C107
10u50
R111
+
47K
C108
10u50
R112
+
47K
C106
10u50
R110
+
47K
D52 D53
R51
2.2K
C51
10u50
C601
0.01
R636
TP102
TP57
TP106
TP108
TP104
D51
+
+
Q51
C52
10u50
TP120
R54
AUTO P-CON
30K
R618
6
5
R620
TP53
R658
12K
R659 470K
3
2
TP55
ATT 1.4dB
47K
D108 D107
R59
10K
IC60
(2/2)
8
4
IC60
(1/2)
R101
1K
R102
1K
100K
C53
680
1
7
-15.0V
1
C101
C102
Q52
15.0V
TP56
1000P
1000P
R56
R55
0.01
C103
10u50
+
C104
10u50
+
4.7K
10K
C625
10u50
R637
10K
4
TP121
+
D606
R103
R104
R646
R105
27K
10K
10K
R106
27K
4.7K
TP11
TP99
TP100
TP101
TP103
TP115
TP114
TP113
TP107
TP105
TP109
-15.0V
R113
1K
R114
+15V
+15V
15K
15V
R208
R209
15V
150K
C35
C36
D103D104
15.0V
47u50
47u50
+
R66
+
R67
TP30
R181
680
ISO. AMP
IC11
(1/2)
3
15
2
33P
C109
C305 0.01 C306 0.01
C121
10u50
+
ATT
R115
-4V
TP301
R652
10K
R116
33K
C110
47P
10K
RCA-GND
+15V
IC32
(1/2)
0V
3
2
4V
15V
R151
4.7K
15K
R653
Q603
1
R182100K
1.1K
2
D186
SW5V
0V 0V
C635
0.01
TP40
+
C181
D181
47u50
+B=65V(MAX BU16V=73V)
TP29
Q30
10K
TP80
15K
R64
R65
Q29
TP83
820
4.7K
R61
10
+15V
TP79
15V
C31
C32
Q26
Q25
+
47u50
+
47u50
Q28
TP111
R119
10K
C111
100P
TP110
R117
R100
+15V
15V
4V
15.0V
-4V
8
C304
1
4
-15.0V
C303
330P
MUTE
TP151
R152
10K
Q151
D151
5V
5.0V
0V
14
34
5
7
IC12
(1/4) (2/4)
TP183
R183
10K
D182
R53
10
R52
30K
D23D25
R57
30K
Q42
R58
10
C114
0.01
C115
0.01
15.0V
IC11
(2/2)
8
6
33P
75K
10K
10K
+
R154
R184
D183
56P
+
+
TP112
10K
D19
33K
D18
R122
-15V
R309
R155
TP184
10
9
5V
0V
6V
1K
SW5V
5V
0V
4
R123 10K
C112 100P
75K
820
-15.0V
4.5V
-4.5V
TP152 TP153
R156
470
0.1
C152
12
47P
C183
8
IC12
(4/4)
65V
C20R46 22
R47 22
C21
C113
10K
R120
10K
R121
5.6K
R308
R302
0.01
TP304
TP302
TP303
R303
R301 10K
C151
1u50
R153 6.8K
613
IC12
C182
+65V
-B=-65V
TP25
C25
R48 47K
1500u100
65V
C26
R49 47K
1500u100
TP26
7
R304 6.2K
0V
R3076.8K
R157
5V
0V
5V
0V
1000P
1/2W1000P
1/2W
DC/DC
10K
1K
IC31
1
2
3
TP154
IC12
(3/4)
TP186
V-
14
C200
10u50
-15.0V
R204
V+
IC32
(2/2)
5
6
C154 47P
R158 680K
R160
68K
C155
5V
0V
IC13
(2/4)
411
5
TP181
9
10
0V
L3
HMAX33.5mm
3:14
C201
1u50
8
7
6
54
7
+15V
15V
+++
47K
15.0V
-15V
R159
R161
12K
3300P
IC13
(3/4)
8
1
6V
4V
-4V
10K
C156
1000P
TP155
TP185
5V
0V
8
R211
3.9K
C202
1u50
R163
6
12K
TP306
R162
C19
R45 10
C213
0.01
15.0V
IC14
(2/2)
8
6
5
4
R205
TP52
6.2K
R306
D305 D304
10K
TP305
3.9K
R305
TP132
TP131
TP134
TP133
Q12 Q
C18
6800P
3900u16
+
C17
3900u16
1/2W
+
Q20 Q
7
30K
TP135
TP136
C21
0.0
D303
R44
2K
R44
2K
TP137
TP138
7
X09-8730-10 (1/3)
6
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