Kenwood KAC-6401 Schematics
1
O
C
R254
R250
2
3
4
5
6
7
A B C D E F G H I J
AUDIO UNIT (X09-5660-10)
LINE IN A
LINE OUT
LINE IN B
SPEAKER
LEVEL INPUT
D60
R85
6.8K
0.047
47K
R83
IC3(2/2)
R86
15K
C47
22P
C117
0.01
C118
6
5
10u16
R76
3
2
R88
15K
C48
22P
C119
62K
6
5
3
2
C50
0.01
0.01
C116
R75
+B
+B
8
4
B
0.01
C49
10u16
62K
15.4V
+
-15.4V
+B
8
+
4
B
-15.4V
B
B
7
1
15.4V
470
R104
+B
7
R89
3.3K
R90
4.7K
1
Q1,2
MUTE
+B
R91
4.7K
R92
3.3K 10u16
+B
15.4V
+B
C51
22u16
C52
22u16
B
R97
B
B
B
150K
R93 C59
3.3K
R94
4.7K
Q3,4
MUTE
R95
4.7K
R96
3.3K
C57
10u16
+
Q1
C53
680P
C54
680P
Q2
C58
+
Q54
+
+
C125
10u35
+
+
D11 D9
C126
10u35
Q55
-15.4V
Q54,55
CONSTANT
VOLTAGE
POWER SUPPLY
10u16
+
Q3
C55
680P
C56
680P
Q4
C60
10u16
+
R98
R53
2.2K
R54
2.2K
R99
R100
R101
10
10
R102
R103
Q5
18K
R106
R107
18K
Q6
Q7
18K
R110
R111
18K
Q8
8.2K
R105
C62
4700P
820
820
C63
4700P
R108
R109
4700P 100
820
820
C65
4700P
8.2K
R112
+
C61
47u25
D14 D13
Q9
R113
100
820
R117
820
R118
R114
100
Q10
Q5,6,9,10
8.2K
DIFFERENTIAL
AMPLIFIER
+B
B
8.2K
Q11
820
R119
820
R120
R116
100
Q12
Q7,8,11,12
DIFFERENTIAL
AMPLIFIER
0.1
C11
D3
D12
C5
1KR110u16
+
C1
R7
9.1K
1200P
R8
C2
9.1K
1200P
C6
R2
10u16
1K
+
D50
C133
E2
0.1
D10
D49
D1
D5
D7
IC1(4/4)
C120
C121
IC1(3/4)
15P
R15
R16
15P
+B
15.4V
4
12
14
13
R19
18K
18K
18K
R20
18K
9
8
10
+B +B
IC1
INPUT BUFFER /
ISOLATION AMPLIFIER
R33
5.6K
51K
R23
R34
5.6K
R24
R31
1K
C17
1000P
R35
5.6K
R36
5.6K
R25 51K
R26 51K
51K
R41
R42
5.6K
5.6K
IC1(1/4)
C27
C28
IC1(2/4)
15P
15P
-15.4V
+B
C43
C37
3
2
R45
5.6K
C127
68P
C128
68P
R46
5.6K
6
5
0.1
C31
C33
0.33
0.47
1
R59
18K
R55
18K
R56
C34
0.47
C38
0.33
R60
B
7
11
B
100K
100K
R63
68K
C41
S5
S5
R64
FILTER SW
68K
HPF OFF LPF
R67
43K
0.047
0.022
R73
43K
VR1
10K(A)
R69 560
R70 560
INPUT
SENSITIVITY
LPF
3K
R77
R78
15K
INVERTER
R81
IC3(1/2)
C45
7.5K
B
J2
0.33
C40
0.33
18K
18K
+B
S2
STMO
R61
R62
AAB
100K
100K
S4
OPERATION
SW
MO ST
R65 R68
68K 43KC39
R66
68K
C42
0.047
S4
FILTER SW
HPF
C44
VR2
10K(A)
INPUT
SENSITIVITY
OFF
LPF
0.022
R71 560
R72 560
R74
43K
B
+B
LPF
3K
R79
R80
15K
INVERTER
R82
IC4(1/2)
C46
7.5K
R87
6.8K
0.047
47K
R84
IC4(2/2)
L
R
L
R
L
R
CN3
D47 D48
R49
IC2(2/4)
15P
C29
5.6K
5.6K
15P
C30
IC2(1/4)
2.2K
R50
2.2K
INPUT
SELECTOR
SW
S1
R51
2.2K
R52
2.2K
5
6
R47
5.6K
C129
68P
C130
68P
R48
5.6K
2
113
-15.4V
B
0.1
C32
S3
OPERATION
SW
7
C35
0.47
R57
R58
1
C36
0.47
B
C107 C106
C3
C4
1000P
1000P
1200P 1200P
R5
R6
C7
10u16
C8
10u16
47K
47K
+
R9
R10
+
C9
22u16
C10
22u16
AL-
AR-
AR+
BL-
BR-
BR+
D2
9.1K
9.1K
D52
+
+
R242
C19
12K
10u16
+
R243
C20
R11
2.2K
12K
10u16
+
C21
R244
10u16
12K
+
C22
R245
R12
2.2K
10u16
12K
+
C23
R246
10u16
47K
+
C24
R247
10u16
47K
+
C25
R248
47K 10u16
+
C26R249
R14 R13
2.2K 2.2K
10u16
47K
+
0.1
C16
+B
IC2(3/4)
C122
C123
IC2(4/4)
15P
R17
R18
15P
+B
15.4V
10
9
18K
18K
13
12
5.6K
8
R21
R38
18K
5.6K
R32
1K
C18
1000P
R39
R22
5.6K
18K
R40
14
5.6K
IC2
INPUT BUFFER /
ISOLATION AMPLIFIER
R30
R37
4
R29
16K
16K R28
16K
16K R27
R43
R44
D54
D4
D51
D53
D6
D8
R212
300
D46D45
R222
300
AR+
AR+
BR+
5
10
BR+
AR-
AR-
BR-
4
9
8
7
6
BR-
3
AL-
AL-
BL-
2
BL-
AL+
BL+
1
R3
1K
R4
1K
R121
C66
C67
R122
C68 R123
C69
R124
R125
620
47u25
47u25
620
R127
620
47u25
47u25
620
18K
C74
6P
+
+
C75
R126
18K
18K
C76
6PR115C64
+
+
C77
R128
18K
D55
D56
6P
D57
D58
6P
R129
C70
3.3K
+
10u35
Q13
D15
R130
3.3K
+
C78
100u25
Q58
Q59
C71
10u35
R131
3.3K
R133 R134
3.3K
C72
10u35
Q60
Q61
C73
10u35
R135
3.3K
RIPPLE
FILTER
C79
10u16
+
C80
R132
3.3K
3.3K
C81
+
+
C82
R136
3.3K
+
R146
R147
10u16
10u16
R148
R149
10u16
10K
R137
Q18
2.2K
R138
620
R139
220
VR3
IDLE. ADJ.
C83
100P
Q14
82
Q14,15,58,59
DIFFERENTIAL
AMPLIFIER
82
Q15
C84
100P
IDLE. ADJ.
220
VR4
Q19
620
R140
+
R141
2.2K
Q18,19
TEMPERATURE
COMPENSATION
Q20
2.2K
R142
+
620
R143
220
VR5
IDLE. ADJ.
C85
100P
Q16
82
Q16,17,60,61
DIFFERENTIAL
AMPLIFIER
82
Q17
C86
100P
IDLE. ADJ.
220
VR6
Q21
620
R144
+
2.2K
R145
Q20,21
TEMPERATURE
COMPENSATION
+B
R150
100
R151
100
R152
100
R153
100
D18
R154
Q22-25
+B +B
B
R155
R156
100
R157
100
D20
R158
Q26-29
D16
Q22
R159
Q23
R160
D17
D22 D21
R167
+
220u25
Q30-33
POWER
AMPLIFIER
DRIVER
D23
Q25
10
Q24
R161
R162
C87
D24
100
OVER-CURRENT
PROTECTION
100
D25
Q26
R163
Q27
R164
D19
D26
R168
10
C88
+
220u25
Q34-37
POWER
AMPLIFIER
DRIVER
D27
Q28
R165
R166
Q29
D28
100
OVER-CURRENT
PROTECTION
3.6K
3.6K
3.6K
3.6K
3.6K
3.6K
3.6K
3.6K
Q30
C89
C90
Q31
C91
C92
Q33
Q34
C93
C94
Q35
C95
C96
Q37
Q32
Q36
470P
470P
470P
470P
470P
470P
470P
470P
R169
R170
R171
R172
R173
2.2
R174
1.8K
220
R175
1.8K
R176
2.2
Q38-41
POWER
STAGE
R177
2.2
R178
1.8K
220
R179
1.8K
R180
2.2
R181
2.2
R182
1.8K
220
R183
1.8K
R184
2.2
Q42-45
POWER
STAGE
R185
2.2
R186
1.8K
220
R187
1.8K
R188
2.2
Q38
Q39
Q40
Q41
Q42
Q43
Q44
Q45
R189
R190
R191
R192
R193
R194
R195
R196
0.1
0.1
B
B
0.1
0.1
2W 2W 2W 2W
0.1
2W
0.1
2W
0.1
2W
0.1
2W
+B
+B
B
+B
B
B
+B
+B
+B
33K
3.3K
47K
R197
R533
33K
B
+B
R198
B
+B
B
+B
+B +B
W401
D31
22.2V
+B
B
+B
B
-22.2V
C97
3300u25
C98
3300u25
+
+
D32
Q53
D29
B
3.3K
R199
R200
3.3K
Q46
R201
C124
R252
R202
D30
3.3K
OVER-V
PROTE
3.3K
R241
Q62
+
100u6.3
47K
R253
C99
2200P
10
R204
C115
47K
P.
D
10u16
1/2W
D59
ONMLK
R201
3
3K 3
3K
IC1,2 : NJM2060M
IC3,4 : NJM4565MD
IC5 : UPC494GS
Q1-4,13-17,58-61 : 2SC945(A)(Q,P)
Q5-12,49,56,57 : 2SA733(A)(Q,P)
Q18-21 : 2SC4137(V,W)
Q22,25,26,29,46,48,52,53
Q23,24,27,28,62,63 : 2SA1037K
Q30,33,34,37,54 : 2SC1627A
Q31,32,35,36,47,55 : 2SA817A
Q38,41,42,45 : 2SC4511
Q39,40,43,44 : 2SA1725
Q50,51 : FKV550T
+B
+B
POWER
.
33K
SWITCH
R202
D33
.
D30
Q46
P. CON.
DETECTION
3.3K
OVER-VOLTAGE
PROTECTION
+
3.3K
R241
C115
10u16
D59
Q62 Q63
D1-8,10,12,15-28,30,
33,35,36,38-40,43,44,
49-60 : 1SS133
D9,11,42 : RD16JS(B)
D13,14 : RD8. 2JS(B)
D29 : RD7. 5JS(B)
D31 : FMU22S
: 2SC2412K
B
∗
B
∗
B
∗
+B +B
+B
D32 : FMU22R
D34 : B30-1460-05
D37 : RD10JS(B)
D41 : 1N5406-M
D45-48 : RD5. 1JS(B)
+B
SWITCHING
REGULATOR
A
∗
A
∗
IC5
MUTE
1K
R205
DRIVER
MUTE
ON/OFF
Q48
R206
R207
D42
2.2K
D36
100
Q49
R208
C100
47K
47u10
R209
1.2K
ERROR
AMP
27K
2.7K
R216
R214
+B
2K
27K
R215
R217
+
D37
R210
1.2K
TH1
10K
C108
+B
B
+
C101
1u50
R223
10K
1000P
OVER-CURRENT
PROTECTION
R218
22K
10K
R221
Q47
1.8K
R203
R211
4.7K
D35
D34
R240
3.3K
+B
+B
B
+B
0V
5.0V
5.0V
5.0V
REFERENCE
REGULATOR
345
0.1V
0.5V
6.8K
R234
14.3V
OSCILLATOR
6
3.8V
R2351000P
C110
16151413121110
1
2
2.5V
3.8V
680K
R213
D40
Q52
+
C109
100u10
14.3V
7
14.3V
0V
16K
R238
SIGNAL LINE
GND LINE
B LINE
B LINE
9
+B
8
R239
6.8K
C111
10u16
+
C112
100u25
680
+B
1
2SA733(A)
2SA1037K
2SA817A
2SC1627A
2SC945(A)
B
C
E
NJM4565MD
2
2SC2412K
UPC494GS
2SC4137
3
B
C
+
E
NJM2060M
2SA1725]B
2SC4511]B
+B +B +B
4
C124
R252
+
100u6.3
47K
C99
2200P
10
R204
R253
47K
1/2W
R254
R250
L1
5.6K
47K
R251
47K
R227
C10310R228
0.047
C10410R229
0.047
C10510R230
0.047
Q50,51
SWITCHING
POWER
STAGE
+B
SP OUT
J1
W403
L+(A)
L+(B)
L-(A)
L-(B)
R-(A)
R-(B)
R+(A)
R+(B)
P-CON
GND
BATT
+B
+B
5
F1(25A)
(F52-0014-05)
E1
CAUTION : For continued safety, replace
6
safety critical components only with
manufacturer's recommended parts (refer to parts list).
Indicates safety critical components.
To reduce the risk of electric shock, leakage-current or resistance measurements
shall be carried out (exposed parts are
C102
10
0.047
D38
Q50
Q51
W402
R231
10
D43
R224
150
R225
150
Q57
R232
10
Q56
Q56,57
SWITCHING
DRIVER
4.7K
R219
4.7K
R220
D39
+B +B
D44
R236
R237
1.5K
1.5K
+B +B +B
C113
3300u16
+
D41
C114
10u16
L2
+
acceptably insulated from the supply circuit) before the appliance is returned to
the customer.
• DC voltages are as measured with a
high impedance voltmeter. Values may
7
vary slightly due to variations between
KAC-6401
individual instruments or/and units.
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