Kenwood KAC-6401 Service manual
POWER AMPLIFIER
KAC-6401
SERVICE MANUAL
© 2002-11 PRINTED IN JAPAN
B53-0007-00 (N) 3379
Heat sink
(F01-1726-01)
LINE INPUT SIDE
Dressing panel
(A21-4267-02)
Connecting cord assy
(E30-6144-05)
25
Fuse
(F52-0014-05)
Accessory
(W01-1606-05)
SPEAKER OUTPUT SIDE
Screw set
(N99-1587-05)
KAC-6401
ADJUSTMENT
No. ITEM
Connect a cassette receiver or CD receiver.
1
IDLE
CURRENT
INPUT OUTPUT RECEIVER ALIGNMENT ALIGN
SETTINGS SETTINGS SETTINGS POINTS FOR
-voltmeter across VOLUME : 0 VR3 (L ch) 2.5mV (a)
FIG.
Connect a DC (A)
each resistor VR4 (R ch)
R189 (A-Lch) (B)
R192 (A-Rch) VR5 (L ch)
R193 (B-Lch) VR6 (R ch)
R196 (B-Rch)
Ach
J3
SP. OUT
Bch
(a) 2.5mV
DC Voltmeter
-
VR3
(A-Lch)
R189 R192
+
VR4
(A-Rch)
VR5
(B-Lch)
R193
Lch
Rch
VR6
(B-Rch)
R196
2
A B C D E F G H I J
1
PC BOARD (FOIL SIDE VIEW)
X09-5660-10
AUDIO UNIT
X09-5660-10
(J74-1547-01)
R184
C93
W162
Q11
C99
W161
B
Q7
W74
W229
Q60
B
E
W3
W228
R194
W191
W187
W183
W160
B
R123
Q3
W4
W197
W159
C85
W317
R168
B
E
W227
E
B
Q57
Q43
R193
R133
W154
E
R94
D44
W226
R156
E
B
E
R237
W212
W153
W314
W120
Q4
W79
C97
R225
W83
W84
D50
W23
D22
W85
C31
R27
C24
BE
R129
R28
W34
R38
W35
R173
IC1
R141
E
R151
W105
W82
C11
R23
C87
W104
W172
W132
W39
C20
W201
Q22
W81
W68
17
R33
R24
W324
B
D21
W308
Q58
W103
W62
W48
C128
C28
Q19
C80
Q30
W171
R106
W73
W1
C83
W80
W51
W33
C27
R146
W102
W32
R46
R34
W170
B
E
B
W111
W107
R96
W41
VR4
R42
R41
C92
R93
C127
R45
C21
C74
R125
C62
W40
W45
W38
R140
W309
C57
W96
R26
R25
R35
W2
W233
R132
R117
R113
W57
W47
R167
Q14
E
W320
W133
W131
W88
W46
R179
Q1
E
R97
W238
C61
Q40
W232
R177
R162
R105
R121
W135
E
E
W199
C52
C126
W230
C71
W192
W188
D13
C51
R192
W231
R191
W195
B
B
R100
C53
B
D14
W60
W217
W168
Q9
Q5
C66
R90
W52
W216
R101
C54
C125
W184
W78
W101
D9
R170
R153
W139
R108
W128
B
B
E
R131
C75
R126
R122
C67
W95
D11
B
E
W307
D15
Q32
D18
R178
E
E
C78
D34
B
W11
W6
B
Q41
E
Q10
Q6
R91
Q55
R161
C91
R118
Q2
R150
R137
Q54
BE
Q24
W169
D56
W134
R147
R114
W311
W22
B
E
E
W215
D23
W147
C58
W19
R154
W318
E
B
R180
BE
W312
B
W310
Q13
E
W176
W138
Q15
C84
R107
C63
Q59
W91
E
B
W21
W18
W10
W5
R142
W200
Q25
W175
W90
B
D24
W158
W114
R104
R99
R54
R53
R98
W240
W174
W8
Q33
W109
C81
W173
W136
D60
VR5
W140
W321
W304
W151
W124
C59
Q20
W77
R163
R143
R134
R102
C55
W76
R204
R182
C72
R109
W75
C50
R71
R80
R32
VR3
R73
W64
C43
R74
R92
IC3
R76
W237
R130
C117
C44
W31
R245
1
4
D53
W306
C18
C89
R159
C70
W150
D2
R9
R10
W30
E2
R174
58
C116
D51
C133
R18
R17
IC4
D8
R77
R176
C122
C123
W29
Q39
W236
W145
R85
R21
D6
D54
D52
D4
W28
C25
W234
58
R37
R22
C23
R189
W235
R190
W196
W193
W189
W144
148
C45
W220
W143
R82
R79
W117
C119
C32
W58
R29
C2
C1
C5
C19
W219
W92
W70
W67
IC2
R152
W185
W142
W106
C118
C16
R30
W50
C6
W305
W16
W141
W121
W118
W116
W71
R40
W49
D3
D49
R7
D5
D1
C22
17
R8
D12
Q31
R87
C129
C29
C121
W15
D17
R39
R16
R175
E
R89
C46
W69
W66
C30
R15
D10
Q38
R160
C90
R20
C120
R169
BE
W94
R47
Q23
W72
W65
R36
R19
W218
B
D55
W17
R43
R44
C130
R48
D7
8
14
Q18
ST/MONO A
2
S2
HPF/OFF/LPF A
C34
R56
C38
R60
INPUT SENS. A
3
INPUT SENS. B
R64
S5
S4
HPF/OFF/LPF B ST/MONO B
R66
W137
R62
C40
C36
W115
S3
R58
4
W63
AB/A
R51
R52
S1
5
A IN B IN A+B OUT
R57
C33
R55
C37
R59
W163
C35
W98
W61
W206
W198
R63
VR1
R69
W113
R70
W130
R61
C39
W7
R50
W87
R65
R3
W59
R138
W129
R4
R83
W127
R49
R86
W202
W112
VR2
D45
C79
C49
W148
R68
C42
R84
C47
R78
C8
D46
R67
W119
R88
W239
R139
C41
R75
41
R81
R72
C48
C7
C3
C4
J2
R2
W37
W24
R222
C107
C106
R212
6
6
10
CN3
W36
R1
D47
C10
R6
R5
1
5
W14
R13
R14
R12
R11
R31
C9
C17
D48
R242
R243
R246
R247
R248
R249
C26
R244
D31D32
Q35
D19
W157
B
R110
R119
R236
R232
W211
R171
E
C68
R95
B
E
W179
R148
W313
C64
R115
R103
W89
D39
B
E
Q27
Q56
R183
C94
R164
B
W178
W156
Q16
E
C56
R124
W55
R220
D26
W177
C69
Q42
B
E
C76
R120
C65
W403
W54
D43
R181
E
R155
W155
R116
B
B
C60
W99
D16
D35
W53
W25
W9
Q21
W323
R145
R187
W210
C82
R166
B
Q34
R144
VR6
D25
Q26
W166
E
E
W322
R253
R112
Q12
W319
Q8
R128
Q17
W165
W108
B
B
R135
C77
R136
R251
Q61
W164
W149
D58
C86
E
E
C115
W167
W146
R127
R111
D42
D37
R208
R197
E
R210
R203
R209
R533
SDGSDG
Q49
R224
R205
B
R200
W402
L1
W12
W13
D38
R231
Q51
W225
C96
C73
R149
R240
R206
D30
D33
B
W221
R219
R185
R250
D57
R202
R199
W224
C103
W56
W27
W20
R241
W86
W223
R196
R195
W190
W186
W182
W152
W123
C88
Q53
D36
W26
TH1
W194
D59
R207
Q47
C98
BE
E
W181
R252
Q52
C100
R238
C111
R235
W401
Q44
R157
BE
Q62
E
B
Q48
W222
R186
R165
C105
Q63
BE
W126
BE
D40
C112
Q50
W209
C95
R211
R239
R172
D20
C104
R215
W208
E
R228
R254
W125
R221
R218
R234
R214
C110
BE
Q28
R230
R229
C102
81
R188
B
R158
R227
W97
D41
Q45
BEBBEBEBBEBEBEBBEBBEEE E E
W214
W213
W207
E
Q37
B
Q36
D28
D27
B
E
Q29
C124
W122
C109
W110
Q46
C101
W100
R201
R223
R198
R213
W93
16
IC5
9
C114
L2
W44
E
B
R216
R217
C108
C113
W43
E1
J1
D29
W42
IC Q Address
IC Q Address
16C
25C
33C
44C
54G
14D
24D
34E
44E
54D
64D
74E
84F
94D
10 4D
11 4E
12 4F
13 5D
14 3D
15 4D
16 3E
17 4F
18 2B
19 2D
20 2E
21 2F
22 3C
23 3C
24 3D
25 3E
26 3F
27 3E
28 3G
29 3G
30 2C
31 2C
32 2D
33 2E
34 2F
35 2E
36 2G
37 2G
38 2C
39 2C
40 2D
41 2D
42 2F
43 2E
44 2F
45 2G
46 4G
47 5F
48 4F
49 4F
50 7F
51 7F
52 4F
53 4F
54 5D
55 5D
56 6E
57 6E
58 4C
59 4E
60 3E
61 4F
62 3F
63 3F
Refer to the schematic diagram for the values of resistors and capacitors.
7
43
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