KENWOOD KAC-8401 Service Manual

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Service Manual for KENWOOD KAC-8401, downloadable as a PDF file.

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background image
© 2003-2 PRINTED IN JAPAN
B53-0041-00 (N) 3379
POWER AMPLIFIER
KAC-8401
SERVICE MANUAL
Dressing panel
(A21-4270-03)
Heat sink
(F01-1728-11)
Connecting cord assy
(E30-6144-05)
Accessory
(W01-1606-05)
Screw set
(N99-1587-05)
Panel
(A64-3053-02)
Rear panel
(A84-0347-02)
background image
© 2003-2 PRINTED IN JAPAN
B53-0041-00 (N) 3379
POWER AMPLIFIER
KAC-8401
SERVICE MANUAL
Dressing panel
(A21-4270-03)
Heat sink
(F01-1728-11)
Connecting cord assy
(E30-6144-05)
Accessory
(W01-1606-05)
Screw set
(N99-1587-05)
Panel
(A64-3053-02)
Rear panel
(A84-0347-02)
background image
KAC-8401
2
ADJUSTMENT
No.
ITEM
INPUT
OUTPUT
RECEIVER
ALIGNMENT
ALIGN FOR
FIG.
SETTINGS
SETTINGS
SETTINGS
POINTS
Connect an
VR5 (A Lch)
After Power on
[1]
IDLE CURRENT
-
DC voltmeter between
VOLUME : 0
VR6 (A Rch)
2 minutes
(a)
chack land A, B
VR7 (B Lch)
2.5mV
(Refer to the PC board)
VR8 (B Rch)
Ach Bch
L+
L-
R+
R-
L+
L-
R+
R-
BU
GND
PCON
DC Voltmeter
2.5mV
B Lch
VR7
VR8
B Rch
VR6
A Rch
VR5
A Lch
+
+
+
+
Fig. (a)
background image
KAC-8401
4
A
B
C
D
E
1
2
3
4
5
6
7
PC BOARD (FOIL SIDE VIEW)
DC Voltmeter
IDLE CURRENT
: 2.5mV
DC Voltmeter
DC Voltmeter
IDLE CURRENT
: 2.5mV
IDLE CURRENT
: 2.5mV
IC4
IC6
IC2
IC1
IC7
IC5
IC3
IC8
D101
D102
D31
Q4
D6
D29
D8
D201
D202
D21
D32
Q23
D26
D100
D34
D38
BRch
BRch
D22
Q24
D28
D200
Q7
D33
D35
D18
D19
D24
D27
D25
D43
Q20
A
IN
B
IN
OUT
Q17
Q18
A
ST/MONO
SP
IN
B
FREQ
A
FREQ
AB/A
A
HPF/OFF/LPF
B
HPF/OFF/LPF
B.B
OFF/ON
SENS
A
SENS
B
B
ST/NONO
AUDIO UNIT X09-5610-10 A/2 (J74-1513-11)
Q213
Q211
S2
S1
S5
S6
Q110
Q210
Q209
S4
D17
D16
Q118
Q216
Q217
Q116
Q117
Q218
Q215
J2
WH1
Q30
ARch
ARch
S3
J1
Q12
Q11
Q1
Q9
D14
Q107
Q13
Q15
Q34
Q103
Q101
Q36
Q212
Q214
Q25
D7
Q112
Q6
D41
D12
D42
Q108
Q35
BLch
BLch
Q33
D11
D40
D10
Q207
Q31
Q201
Q205
Q203
Q208
Q32
Q202
Q206
Q204
Q104
Q102
Q106
Q26
D39
Q114
Q28
Q29
B
E
E
B
E
B
E
B
E
B
B
E
E
B
B
E
B
B
E
B
B
EE
EE
B
SD G
SD G
E
E
E
B
B
B
E
E
E
E
E
E
B
B
E
EB
EB
EB
EB
EB
EB
E
3
B
E
B
1
BE
B
E
EB
EB
EB
EB
BE
B
E
E
BB
B
E
B
E
B
E
E
B
B
B
B
B
E
E
B
E
E
B
E
B
B
B
B
B
E
B
E
B
E
E
B
B
E
C39
R313
R307
R311
R309
C303
R146
R134
R144
R316
R315
W530
R310
C40
R308
R312
R314
C304
W528
W527
W541
W537
C273
W536
R143
C53
R137
W533
R238
R230
R108
R330
C101
R103
C102
R104
R329
R106
C106
W521
R125
C130
R145
W510
C154
R156
R154
R158
R160
R162
R166
R164
C41
W508
R245
R267
R246
R244
R318
W509
W511
C42
R243
W507
R256
R258
C254
R251
R268
C34
R
128
R127
R259
R12
R11
R8
R260
R254
R262
W504
R266
R49
R47
W505
R9
R27
C54
R220
R218
R118
R120
C201
R203
C202
R204
C126
C226
R196
R296
W523
W522
R119
R217
R219
R117
R227
R228
R294
R26
R269
W515
R44
W525
R174
R60
R59
R153
C153
R157
R155
C175
R159
R161
R77
W503
R80
R81
R78
C47
R75
C49
C48
R46
R14
R28
R15
R21
R16
C6
R23
R17
R19
R43
R34
R36
R35
R33
C271
C38
R226
R210
R10
R13
R123
C301
W512
R132
W542
W526
R299
W540
R199
W529
W532
R150
R149
C119
R250
W539
C173
R249
R135
W534
W535
R133
C117
R298
C230
R248
R198
W519
R129
R139
R141
R131
C36
R100
W531
R86
R319
W520
R235
C218
R234
R236
C120
R138
C118
R136
R237
C44
R302
W518
R232
R140
R142
R320
R304
C35
C220
R240
R239
C217
R233
R241
C43 R242
W513
C219
R107
R109
R229
C171
C105
R105
W514
R110
R124
R126
C132
R231
R303
R301
R114
R116
C114
C113
C131
R113
C214
R111
R115
R112
C24
R68
R64
R272
R324
R276
R148
C50
C32
R130
R274
R152
R62
R66
C22
R54
R58
C20
R270
R168
C176
C275
R255
R257
R306
C302
R252
R305 R317
R194
C33
R263
R261
R265
R48
R264
C276
C253
R69
R70
W543
R253
R224
R214
R121
W538
R200
C56
C55
R207
R208
R331
R332
R87
C205
R205
C206
R206
R222
R122
C37
C232
R216
R212
C231
R225
C213
R209
R223
R213
R215
W517
R211
R221
R295
R195
W516
R273
R271
R275
C23
R65
R61
W506
R63
R67
C21
R176
R322
R172
R52
R170
R151
R167
C19
R57
R53
R56
C18
R169
R20
R45
R22
W524
R18
R31
R37 R38
R32
1
7
814
1
7
814
1
7
8
14
1
7
8
14
1
7
814
1
7
8
14
1
4
58
9
16
18
C3
W229
W51
W60
W35
W38
W52
W109
W173
W137
W70
W202
W140
W113
W59
W43
W74
W58
W131
W155
W42
W139
W143
W76
W95
W44
W55
W48
W243
W239
W179
W135
W221
W45
W224
W223
W216
W187
W213
W234
W188
W165
W72
W269
W171
W164
W180
W36
W158
W271
W272
W236
W206
W154
W57
W263
W215
W261
W259
W264
W105
W265
W244
W249
W222
W238
W237
W232
W114
W64
W67
W118
W78
W79
W54
W56
W142
W88
W90
W98
W132
W102
W100
W141
W199
W37
W91
W89
W250
W65
W66
W63
W235
W39
W108
W200
W83
W86
W168
W233
W248
W246
W247
W210
W211
W161
W138
W87
W219
W228
W231
W167
W133
W260
W252
W245
W80
W230
W184
W166
W144
W147
W198
W106
W149
W150
W178
W151
W174
W152
W197
W214
W220
W162
W185
W169
W183
W159
W170
W156
W163
W160
W172
W153
W181
W50
W134
W145
W119
W201
W112
W110
W157
W126
W120
W217
W122
W218
W46
W116
W121
W148
W69
W71
W227
W93
W123
W125
W97
W136
W81
W128
W96
W127
W77
W104
W82
W75
W129
W49
W99
W73
W101
W92
W40
W68
W130
W84
W85
W124
W41
W62
W61
W266
W176
W53
W94
W103
+
C45
R281
R283
R277
R285
R279
VR3
VR2
VR1
VR4
L3
R287
R289
C12
C11
W407
C209
C112
C111
C110
C109
C211
R102
C150
C250
R197
C204
C203
C200
C210
C103
C104
C216
C215
C116
C115
C100
R297
R201
R202
C13
C14
R30
C306
C305
C128
C228
R288
R290
R286
R280
C266
R278
C268
R284
C155
R282
C270
VR8
C151
R190
R188
C166
C16
C264
C161
C28
R101
R40
C26
C31
C30
C7
C29
C5
C15
C1
R42
R41
R39
VR7
C265
C263
C267
C269
W279
W278
W277
W276
C222
C123
C121
C124
C307
C308
C224
C223
C221
C122
C2
C255
C259
C251
C257
C261
C256
C260
C252
C258
C262
C27
C160
C156
C158
C152
C162
R185
R84
C170
R186
R180
R178
R184
VR6
R182
C164
C168
R181
C212
W273
C4
W274
W186
TH3
C57
W117
C9
R323
background image
KAC-8401
5
J
I
H
G
F
1
2
3
4
5
6
7
DC Voltmeter
IDLE CURRENT
: 2.5mV
D4
Q8
Q21
Q22
D23
D25
3
Q1
D13
D3
Q2
D2
X09 B/2
Q109
Q115
Q117
D1
Q16
J3
Q14
Q12
CN2
D15
11
Q10
Q13
Q103
Q105
CN1
Q3
D39
D5
Q113
Q111
Q27
ALch
ALch
Q29
Q5
D9
B
E
E
B
SD G
SD G
SD G
1
2
12
56
78
9
10
11
34
EB
EB
EB
E
BE
B
31
BE
B
E
B
E
B
E
B
E
B
E
B
E
B
E
E
B
B
E
E
B
C175
R159
R161
R165
R163
R24
R7
R29
R25
R5
R4
R6
R171
C17
R55
R51
C8
C51
R79
R74
R72
R73
R71
R34
R36
R35
R33
C19
R57
R53
56
18
R169
R173
R50
W524
C52
R175
R321
W501
W502
R2
R1
R3
31
R37 R38
R32
W35
W14
W34
W38
W6
W2
W7
W30
3
W13
W32
W16
W17
W9
W11
W5
W44
W21
W20
W25
W29
W28
W26
5
W36
W18
W33
W8
W19
W22
W4
W15
W37
W27
W23
W39
W24
W10
W12
W31
C10
C45
W403
W404
W402
W401
W405
W406
7
C309
R191
L1
L2
VR5
C191
R291
C291
R292
TH1
R177
C155
C157
C165
C161
R183
C169
R189
R187
C292
R192
C192
C25
R179
R185
C46
C167
R181
C163
C159
R328
W275
R326
R327
R325
Refer to the schematic diagram for the
values of resistors and capacitors.
X09-5610-10
IC
Q
Address
13B
25B
33B
44B
54B
66B
75B
84E
14F
24G
34F
43C
55F
63C
73C
84F
92E
10
2F
11
2E
12
2E
13
2F
14
2F
15
2E
16
2F
17
2D
18
2D
20
4E
21
4F
22
4F
23
4E
24
4D
25
5E
26
5C
27
6G
28
7D
29
7F
30
6E
31
4C
32
4C
33
1C
IC
Q
Address
34
7C
35
2C
36
7D
101
5E
102
5D
103
5F
104
5D
105
5F
106
5D
107
5E
108
5D
109
6F
110
6D
111
7G
112
7E
113
7G
114
7D
115
6G
116
6E
117
6F
118
6D
201
4C
202
5D
203
4D
204
5D
205
4C
206
4D
207
4C
208
4C
209
2C
210
6C
211
1C
212
7C
213
2D
214
7C
215
2C
216
6C
217
2C
218
6B
background image
KAC-8401
6
A
B
C
D
E
1
2
3
4
5
6
7
0V
0V
0V
0V
-15.8V
15.8V
0V
0V
15.8V
0V
0V
0V
0V
0V
0V
-15.8V
0V
15.8V
15.8V
-15.8V
15.8V
0V
0V
0V
0V
15.8V
0V
0V
0V
0V
-15.8V
0V
0V
-15.8V
-15.8V
0V
0V
0V
0V
(X09-5610-10) (A/2)
6
C213
15P
R225 10K
C231 15P
C232 15P
10K
R226
C203
10u16
10K
10K
10u16
C204
1200P
C201
R203
1200P
C202
R204
15P
C206
9
10
11
8
10K
R208
10K
R210
10K
R224
13
12
C214
15P
220
R87
R200 1K
C200 1000P
10K
R205
10K
R332
1K
R206
R331
1K
10K
R207
R216
10K
R212
82K
R211
C271
4700P
10K
R215
82K
R223
10K
10u
C2
10
C
R304
4.3K
R232
10K
10K
4.3K
R302
4
13
12
14
10K
R309
R310
C38
0.01
14
10u16
C216
22K
R228
C43
0.01
4.3K
R306
C302
100P
2
4
3
22K
R227
R307
24K
R308
0.22
C304
24K
C303
0.22
5
8
R244
3K
0.01
10K
R230
10
9
8
R234
R236
1
C40
300
0.047
R240
C220
6
11
5
7
0.33
C218
2
3
1
R24216K
R317
R311
R312
C306
100K
R318
2.2u50
100K
3.6K
1.1K
R314
3.6K
C305
2.2u50
300
0.01
C39
7
R313
1.1K
R316
4.3K
R315
4.3K
R237
2.2K
VR2
R243
R241
16K
10K
R125
15P
C131
C132 15P
R126 10K
C106
R122
2
1
4
3
6
5
10
9
78
15P
C205
6
5
4
7
R209
10K
82K
R213
R214
3
2
82K
C209 10u16
R220 51K
R217 51K
2.2K
R221
2.2K
R222
2.2K
R219 51K
R218 51K
R118 51K
470P
0.1
C54
C56
470P
R297
300
R197
300
C55
0.1
C53
2.2K
22u16
2.2K
R295
R194 2.2K
R294
2.2K
R117 51K
R120 51K
2.2K
R121
1000P
C226
2.2K
R296
1000P
C126
2.2K
R196
C250
22u16
R119 51K
R195
C150
C111
10u16
C109
10u16
C112
10u16
R114
C103
10u16
C104
10K
10u16
10K
1200P
C101
R103
1200P
C102
R104
R115
82K
10K
R105
R100
4700P
15P
9
10
11
8
R108 10K
10K
R330
1K
R106
R86
220
1K
10K
R110
R116
82K
R124
10K
12
C114
15P
13
C171
10K
R112
1000P
C100
R329
1K
10K
R107
15P
C105
5
6
4
7
C113
15P
R111
10K
82K
R113
10K
R123
10K
R109
3
2
10u16
5
10
C
10
C
C37
1
10u16
C215
0.01
C41
0.01
100P
R303
4.3K
4.3K
R301
4.3K
C301
R305
3
2
4
3K
R235
R231
10K
R229
6
5
1
10K
10K
7
R233
11
9
10
12
13
C217
0.33
14
8
10K
0.047
C219
R239
R140
C34
0.01
10K
R130
10K
R132
7
0.047
10K
C120
6
11
C33
0.01
10K
R133
R139
2.2K
R137
R135
2.2K
R138
R136
10K
R134
14
C116
10u16
22K
R128
2
3
1
50K
VR1
22K
R127
1
10u16
C115
6
5
R129
10K
7
10K
R131
22K
R143
C35
0.01
3K
3
2
1
0.33
C118
16K
R142
22K
C124
R146
C122
10u16
C36
0.01
22K
R144
14
0.33
C117
3K
13
16K
R141
12
10K
0.047
C119
10
4
8
9
22K
R145
10u16
C123
10u16
C121
15K
R198
100
R199
82K
1K
R101
R102
1K
4
2
8
10
8
10
4
R238
2.2K
C210 10u16
C212 10u16
C211 10u16
2
C110
10u16
R201
1K
R202
1K
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
D202
IC3(3/4)
IC5(4/4)
IC3(4/4)
(1/2)
S2
IC5(3/4)
IC5(2/4)
IC5(1/4)
S5
IC1(1/4)
IC3(1/4)
D200
INPUT
SPEAKER
J2
R
(2/4)
D201
R
LINE
IN B
L
R
LINE
OUT
L
LINE
IN A
L
J1
D100
D102
IC1(4/4)
S1
(2/4)
D101
AB/A
IC4(1/4)
IC6(2/2)
IC4(2/4)
IC4(4/4)
IC4
S6
IC7(1/4)
IC7(2/4)
IC2(1/4)
IC2(2/4)
IC2(4/4)
IC2(3/4)
S3
ST/ MONO
IC1(3/4)
HPF/
LPF
OFF/
IC3
ST/MONO
(3/4)
IC6
IC1
B B.
ON/OFF
ISO
LPF
HPF
LPF
LPF
LPF
HPF
HPF
BASS BOOST
ISO
X09-5610-10(1/3)

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