Kenwood KAC-9104-D Service manual
CLASS D MONO POWER AMPLIFIER
KAC-9104D
SERVICE MANUAL
© 2008-1 PRINTED IN JA PAN
B53-0611-00 (N) 519
Dressing Panel
(A21-6637-01): (E,K type)
(A21-6638-01): (M type)
Fuse (30A)
(F52-0015-05)
FUSE[30Ax2] P.CON
Accessories
(W01-1606-05)
POWER IN
BASS BOOST
SPEAKER OUTPUT
LEVEL[dB]
Screw & wrench key set
(N99-1820-05)
OFF 15Hz
E,K type
M type
180û0û
25Hz
PHASE
ISF
[MIN] [MAX]
LPF
FREQUENCY[Hz]
INPUT
SENSITIVITY[V]
LINE IN LINE OUT
SP LEVEL INPUT
SIGNAL SENSING
TURN-ON
Connecting cord assy
(E30-6145-05)
19cm
This product complies with the
This product uses Lead Free solder.
RoHS directive for the European market.
2
KAC-9104D
L
LINE IN
(0.2~5V)
R
L
UT
LINE O
R
L+
LR-
SP INPUT
R+
+6dB
IC6(2/2)
SUMMING
AMP
IC6(1/2)
TRIANGLE
WAVE
NF
IC1
ISO-AMP
IC7
IC2(2/2)
INV
SEL
IC8,9
DEAD
TIME
IC3(1/2)
I.S.F
15Hz
25Hz
I.S.F
SEL.
Q102-104,108,109
LEVEL
SIFT
Q101
D-AMP
ON/OFF
SENS.
VOL
6dB
IC3(2/2)
Q105-107,
Q110-112
DRIVE
IC4
L.P.F
FREQ
(50~200Hz)
Q313,314Q315
MUTE ATT
Q701-704
FINAL
MOS-FET
LC FILTERCOMP
FREQ=40Hz
IC5
Bass
Boost
LEVEL
0~18dB
+35dB
BLOCK DIAGRAM
SP
OUTPUT
dB
50
40
30
20
10
LEVEL DIAGRAM
Q24-27
±
AVR
15V
D21,22 Q30
±
B
IC13
OVERLOAD
DET
+
HB
AVR
IC17 (2/2)
THERMAL
DET
IC15
DC/DC
CON
0
D CLASS POWER AMPFILTERISO AMP
AUTO
P-CON
Q2,3Q4,5
POWER
ON/OFF
Q307-311
DC-OFFSET
DET
P-CON
LC FILTER
BATT.
GND
KAC-9104D
COMPONENTS DESCRIPTION
AUDIO UNIT (X09-8750-10)
●
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 Isolation amplifi er Isolates noises caused by potential differences in GND
IC2 Phase Change phase (0° → 180°)
IC3 INFRA SONIC FILTER Cuts off ultra low frequency of audio signal
IC4 LOW PASS FILTER Cuts off high frequency of audio signal
IC5 BASS BOOST Bass boost (Variable level)
IC6 (1/2) Triangular wave generation Generates reference signal for digitalizing analog signal
IC6 (2/2) Error amplifi er Compensates errors by feedback from the output
IC7 Comparator Digitalizes by comparing analog signal with triangular waves
IC8,9 NAND
IC10,11,14 Resonance detection circuit
IC13 Comparator, Control circuit
IC15 DC/DC converter IC Generates drive signal for switching component
IC16 (1/2)
IC16 (2/2)
IC17 (1/2) Power supply voltage PWM control
IC17 (2/2) Temperature protection Turns off DC/DC converter when temperature in the set becomes too high
Q1-3 PCON switch Turns on the circuit when ON signal is applied to the PCON circuit
Q4,5 AUTO Pcon Sends DC voltage from SP IN to Pcon control circuit
Q6,7 Mute Generates mute drive signal and turns off LED
Q8,9 DC/DC converter ON/OFF control Turns off DC/DC converter when protection is detected
Q10 4.4V AVR Vef 5V reference AVR
Q11,12 DC/DC converter pulse ON/OFF control ON or OFF of DC/DC converter drive waveform
Q13-16 Gate driver Gate driver in DC/DC converter FET
Q17-22 DC/DC converter DC/DC converter switching
Q23 FAN drive Limits FAN power supply voltage under the rated voltage
Q24-27 AVR ±15V AVR
Q28,29 Tracking when ±15V AVR is turned OFF Matches the trailing edge of “-15V” AVR with that of “+15V” AVR
Q30 HB 15V AVR Stacking AVR to obtain High+B for D-class
Q101,113 D-class amplifi er switch Turns the D-class amplifi er ON or OFF
Q102-112 Pulse amplifi cation, shaping and level shift Generates the signal that drives the D-class fi nal FET
Q301-304 Current-voltage conversion
Q305,306 Resonance detection circuit
Q307-311 Latch circuit Detects abnormal output DC voltage and retains it
Q312 Comparator, Control circuit
Q313
Q314
Q315 Mute Turns off audio signal
Q701-704 Electric power amplifi cation Switching of D-class high current
Attenuation circuit to attenuate input signal by 6dB
Attenuation circuit to attenuate input signal by 1.5dB
Attenuation circuit to attenuate input signal by 1.5dB
Attenuation circuit to attenuate input signal by 6dB
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 the protection operation
Controls D/D CON and D-class On/Off with the over current detection and
Pcon control signals
Attenuates output when temperature in the set becomes too high
Attenuates output when temperature in the set becomes high
Controls the dead time of DC/DC converter when the power supply voltage in
the secondary side becomes too high. Prevents the power supply from pumping
Converts current to voltage to detect over current and sends it to the comparator
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
Attenuates output when temperature in the set becomes high
Attenuates output when temperature in the set becomes too high
3
A B C D E
R
B
D27
D28
3
Q
KAC-9104D
1
PC BOARD (FOIL SIDE VIEW)
AUDIO UNIT
X09-8750-10 (J76-0475-11)
R190
W152
R200
Q701
W149
R42
R64
W150
W151
L3
W171
W501
W170
C619
C23
C25
C26
W154
W155
W158
W153
P2
W507
C17
C18
W180
Q17
Q18
D21
D22
R52
GDSGDS
R53
2
3
W173
W176
W179
R54
GDSGDSGDSGDS
Q19
W174
W502
R55
W177
Q20
R188
W145
SDGSDG
W144
C24
C28
R65
C27
Q702
R189
W140
W241
W242
W128
W129
R201
W238
W135
W131
W134
R45
W127
W132
R63
C20
R202
W125
C143
D33
W123
CN1
W120
W121
21
Q703
C145
W114
W115
Q704
R199
SDGSDG
R197
R162
L2
D20
E
R198
D13
R303
E
Q30
4
5
6
R56
Q21
W178
R57
Q22
R35
R30
R75
Q9
W503
W504
CN2
12
W175
W508
W167
W168
R50
Q13
R48
R46
W253
W250
Q14
BEBEBE BE
Q10
W254
R39
R37
W252
IC15
18
C10
R38
BEBE
Q8
W251
W164
W166
W172
W169
W506
W159
W160
W161
W162
W163
R51
R47
Q15
BE
BE
Q11
W249
916
C11
R36
R34
R356
C9
W248
D17
C323
L1
R49
BE
Q16
Q12
W247
W245
W246
D2
W156
W157
C616
C151
C152
TH1
C19
R358
C324
R357
R355
85
IC17
41
C12
R41
C13
W138
W139
D35
R3
J3
R43
R40
W137
W243
W239
W136
D15
R62
W255
D16
W240
W133
W130
W148
W147
P1
W244
R44
C325
R359
W141
W142
W143
W146
D3
W505
D1
W126
W124
P3
C150
C146
C147
C148
W257W258
W117
W122
W119
W116
C149
W112
W113
W111
D25
D26
W108
W110
W109
X09-8750-10
Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address
IC1 5H IC6 4H IC11 3I IC17 5D Q5 5I Q10 5B Q15 5B Q20 4B Q25 2G
7
IC2 5H IC7 4H IC13 3H Q1 4H Q6 4G Q11 5B Q16 5C Q21 4B Q26 2F
IC3 5G IC8 4I IC14 3H Q2 4H Q7 3G Q12 5C Q17 3B Q22 4B Q27 2I
IC4 5G IC9 4H IC15 5B Q3 4G Q8 5B Q13 5B Q18 3B Q23 3F Q28 2I
IC5 5F IC10 3I IC16 5G Q4 5I Q9 5B Q14 5B Q19 3B Q24 2F Q29 2I
4
JIHGF
W111
KAC-9104D
1
Q107
B
Q301
R72
R184
C128
Q30
W165
R305
BEBE
Q26
R195
R186
R187
W105
E
EB
Q106
R185
W259
W102
W104
D19
R302
C302
EB
C35
R73
C33
W103
W223
C126
85
W235
14
R151
C127
R150
W100
W101
R147
IC5
Q103
Q105
EB
Q102
R181
R183
EB
R182
E
B
R178
R203
Q104
C154
W99
W97
Q23
EB
W96
W91
C328
R373
R372
W89
W93
W98
W95
W118
C125
R146
W92
W90
C608
W94
C607
R149
R148
VR3
R180
R177
R142
C123
W233
W234
BE
BE
D113
W88
Q112
R59
R60
C122
C153
R179
Q101
BE
R176
R204
D18
R61
D316
W84
W87
R371
R143
R144
85
14
R141
W232
BE
R194
Q113
D-SWITCH
C155
W85
W81
C319
W231
W86
W230
W229
C144
IC4
C142
R139
C121
R344
R193
R192
D34
W80
R361
R360
Q109
EB
EB
W82
R25
R24
W83
R352
C605
C606
R196
Q108
C326
S2
R132
C134
C15
C16
W78
R6
R33
Q308
BE BE
Q309
R346
W227
R362
R363
41
W256
IC16
R12
58
R354
W228
W72
C124
W79
W76
W226
R11
W225
C5
R350
R345
W77
Q25
R191
Q3
D6
W222
D310
C322
R353
85
14
R137
R138
W224
W219
Q110
Q111
W75
EB
D8
D9
W22
C321
C318
W218
C120
R145
W220
EB
R66
BE
BE
W73
R5
R23
C6
R26
BE
BE
R349
C327
R364
W217
R374
R136
R140
W71
R31
R7
Q6
W216
Q310
R125
VR2
W74
R1
D4
D311
C320
Q307
R365
R369
W70
R27
D315
BE
Q313
W215
W69
C1
R348
BE
D314
C119
D10
R367
W68
R347
R131
C604
C31
W27
C29
R337
C313
85
IC14
14
D308
C307
W20
W21
R316
C310
W22
W23
W203
R170
41
C609
IC7IC6
58
C136
R167
R123
C109
R114
85
IC1
14
C105
R107
R108
R103
R106
C115
C32
C30
R338
C316
C315
C314
R339
R340
R341
85
C611
W19
14
C617
CUR
R306
BE
D302
Q305
R311
Q306
C305
R320
BE
R317
R319
14
C613
IC11
R315
85
R313
R314
C306
IC8
814
C140
R175
C139
D112
R168
R169
D106
C610
R166
R165
W16
R122
R112
W17
C108
C601
W201
C602
D102
R109
W202
W14
D103
C103
C104
R104
C101C102
W18
R102
J1
D101
W15
D24
D309
IC10
D301
R312
R318
17
R174
D107
R101
W32
R901
D23
W39
W33
W34
W36
W46
R335
W57
W63
W66
W47
W38
D12
C311
R336
W40
W41
C312
W26
D307
R327
85
IC13
14
R332
R330
IC9
C309
C308
R163
C135
41
58
R159
R158
R157
W37
W31
W205
R127
17
R323
C107
W35
R328
R322
R113
W204
C615
R164
W29
R160
R111
W30
R321
R110
R105
W24
W25
W28
C106
R121
D306
W54
W61
R28
W213
Q7
E
B
W214
R29
R2
C8
R32
D11
D14
Q2
C7
BE
Q311
R366
W62
W64
R368
BE
Q315
W67
R129
R130
W58
W65
C117
W59
W60
W55
BE
BE
W56
W212
R4
W48
W49
W50
W51
W52
C118
BE
Q312
Q314
W44
W211
Q1
W53
D5
BE
R153
R128
C603
W42
R152
R135
D312
W210
R154
C130
VR1
W209
D305
C131
R126
R134
C129
R155
85
14
W43
R329
C614
D313
R351
R331
R334
R333
W206
W207
814
R325
R324
W45
W208
C132
R161
R156
C110
IC2IC3
R124
R133
S3
D111
R21
R342
R307
D110
D108
W12
W13
C137
C113
C303
W8
Q27
C317
R173
R10
R8
R9
BE
R310
D304
C612
W9
R902
D109
BE
Q5
R343
Q29
R69
R308
R309
W11
W6
W7
C3
C304
D303
R171
R172
R119
BE
R67
W10
R71
R70
BE
Q28
R68
R904
R903
W3
W4
VOLT
W5
W1
W2
C138
2
3
4
C4
Q4
BE
C2
R20
D7
R13
D105
D104
C111 C112
R116
C114
R120
D32
D30
R115
R117
R22
R118
5
J2
6
R198
G
Q24
D13
R303
Q302
C301
W106
R301
EB
Q304
R304
EBEB
Q303
EB
D25
D28
D26
D27
D29
C34
W108
113
W110
W109
W107
I.S.F
B.B
L.P.F
INV
INPUT SENS
Refer to the schematic diagram for the values of resistors and capacitors.
Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address
Q30 4F Q105 2F Q110 2G Q302 3F Q307 4G Q312 3H Q702 2D
Q101 2G Q106 2F Q111 2G Q303 4F Q308 4G Q313 5G Q703 2E
Q102 2G Q107 2F Q112 2G Q304 4F Q309 4G Q314 5H Q704 2E
Q103 2F Q108 2G Q113 2G Q305 3H Q310 4G Q315 5G
Q104 3F Q109 2G Q301 4F Q306 3I Q311 4G Q701 2C
7
5
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