Kenwood KAC-7201, KAC-7251 Schematics
A B C D E F G H I J
B
E
C
1
LINE OUT
2
SPEAKER
LEVEL
INPUT
3
4
5
6
LINE IN
(X09-5600-1x) (A/2)
J1
Rch
Lch
Rch
Lch
J4
9
10
7
8
5
6
3
4
1
2
C219
L+
L-
R-
R+
1000P
R1
1K
C1
1000P1000P
C2
R2
1K
R13
2.2K
R14
2.2K
D7
D8
MUTING
SW (Rch)
C3
10u16
+
R3
R4
C4
10u16
+
D24
R15
62K
R17
62K
R18
62K
R16
62K
R101
2.2K
R205
10K
MUTING
SW (Lch)
R206
10K
R102 C102
2.2K+22u25
10K
10K
C11
10u16
+
C13
10u16
+
C14
10u16
+
C12
10u16
+
Q3
Q4
R29
1K
D3 D1
D47 D45
D4
D48
D2
D46
R19
47K
R21
47K
R22
47K
R20
47K
R252
150K
Q101,103
1st-STAGE
DIFFERENTIAL
AMP(Lch)
C101
22u25
+
C103
1000P
C104
1000P
Q102,104
1st-STAGE
DIFFERENTIAL
AMP(Rch)
IC1
(2/4)
5
6
C5
15PR5
R7 10K
10K
R6
10K
R8 10K
9
R30
C6
15P
1K
10
11
6.8K
R105
Q101 Q103
R111
13K
R103
R104
4700P
100
1K
R107
1K
R108
R112
4700P
100
13K
6.8K
R106
C8
0.01
15.2V
4
R9
7
10K
R165
IC1
(3/4)
8
-15.2V
C9
0.01
Q107
TEMPERATURE
COMPENSATOR
(Lch)
Q105
CURRENT
MIRROR(Lch)
Q109,111
2nd-STAGE
DIFFERENTIAL
AMP(Lch)
R113
C109
C105
1K
R109
1K
R110
C106
C110
R114
Q104Q102
Q110,112
2nd-STAGE
DIFFERENTIAL
AMP(Rch)
Q106
CURRENT
MIRROR(Rch)
Q108
TEMPERATURE
COMPENSATOR
(Rch)
220
1K
47u25
47u25
1K
C100
1000P
R100
1K
+
+
4700P
C107
R115
R116
C108
C165
R10
10K
47P
13K
13K
47P
C111
C112
330P
D9
D10
Q110
330P
D49
D50
R117
150
150
R119
D101
Q105
6.8K
R121
C115
1000P
6.8K
R123
Q109 Q111
150
R125
C205
150
R126
Q112
6.8K
R124
C116
1000P
6.8K
R122
Q106
R118
R120
D102
150
Q5,7
OVER LOAD
DETECTOR
(Lch)
R163
R127
R129
C113
C129
R207
1/2W
+
220u50
C114
C130
R130
R164
1.8K
R128
Q6,8
OVER LOAD
DETECTOR
(Rch)
150
1.8K
VR3
510
22P
22P
22P
22PVR4
510
15.2V
14
470P
470P
D11
D13
C123
C127
C124
C128
D14
D12
470P
470P
IC1
ISOLATION
AMP
C53
10u16
1
+
VR1
10K(A)
S1
C52
10u16
+
INPUT
SENS
IC2
4
(2/4)
6
5
R27
R31
22K
430
R28
22K
R32
430
R33
2.2u50
300
7
C19
0.22
BASS BOOST
OFF(RM)/+12dB
C21
S2
R335
∗
R333
220K
220K
R35
R39
R37
680
220
330
C71
C72
D72 D71
ST/MONO
C20
470P
470P
470P
470P
R201
Q115
Q119
Q120
Q116
120
C207
C209
C210C208
R203
13K
Q113
470P
470P
470P
470P
R137
4.7
R141
4.7
R142
4.7
R138
4.7
R219
R221
Q117
Q118
R220
R222
Q114
C201
47u25
+
1K
1K
1K
1K
R135
R215
R217
R218
R216
D17Q1
C203
47u25
4.7
680
680
680
680
C204
47u25
+
+
Q113,115,117,119
POWER AMP
DRIVER(Lch)
220
R161
R139
4.7
R140
4.7
220
R162
R136
4.7
R143
R145
R146
R144
C202
47u25
+
4.7
4.7
4.7
4.7
R204
13K
R151
R153
R154
R152
IC2
(3/4)
Q121
0.1
0.1
Q123
Q124
0.1
0.1
Q122
R202
R147
2W2W
R149
R150
2W
2W
R148
Q2D18
4.7
4.7
4.7
4.7
10
120
Q125
Q127
Q128
Q126
9
-15V
AVR
0.1
R155
0.1
R157
0.1
R158R156
0.1
0.22
8
11
-15.2V
Q121,123,125,127
POWER AMP
(Lch)
2W
2W
2W
2W
Q122,124,126,128
POWER AMP
(Rch)
Q114,116,118,120
POWER AMP
DRIVER(Rch)
R336
220K
C22
∗
R34
2.2u50
300
R334
220K
R36
R38 R40
680
330 220
DC
OFFSET
DETECTOR
Q400
1
3
4
C231
2.2u100
++
C230
2.2u100
2
IC1
C51
15P
10K
R23
(1/4)
3
2
15P15P
C15
R25 10K
R11
C17 15P
10K
R12
C18 15P
10K
R26 10K
13
C16
12
IC1
(4/4)
15P
C50
10K
R24
+
C229
100K
R254
10u35
+15V
AVR
C121
C125
R131
33
100
Q107
VR3
IDLE
220
Q5
ADJ
Q7
D15
R133
100
10
R134
100
D16
Q8
VR4
Q6
IDLE
220
ADJ
Q108
R132
33
100
C122
C126
KAC-7201/7251
KAC-7201/7251
R41
2.2K
∗
1.2K
16151413121110
1
8.3V
X1
X2
VDD
XCOM
Y0Y2YCOMY3Y1
2
345
47K
R209
R210
A
X0
47K
Q402
R401
12K
C400
0.01
Q401
+
6.2K
C403
R405
100u6.3
Q29
R274
10K
C228
100u6.3
+
R273
22K
D41
33K
R211
33K
R212
D43
47K
R332
X3
INH
678
R338
1.2K
∗
12K
R404
Q403
R270
47K
R224
10 1/2W
C214
1500P
C213
1500P
R223
10 1/2W
A
VEE
R402
10K
D400
R403
15
14
13
12
11
10
R331
9
2.2K
9
R339
47K
100
R340
100
INPUT
B
L
L
HAL
LBH
HH
IC7
VSS
4-ch
MULTIPLEXER
-8.3V
R268
0.01
C402
Q11-16
SW
DRIVER
L4
10
9
CHANNEL
27K
1
2
3
4
5
6
7
8
ON
X0,Y0
X1,Y1
X2,Y2
X3,Y3
C227
R42
2.2K
R269
2.2u50
3
2
R43
2.2K
R44
2.2K
R46 10K
13
12
1K
27K
R281
R400
1K
330K
R266
TH2 TH3TH1
2.2K 2.2K 2.2K
+
91K
C226
R265
0.1u50
W29
Q11 Q13 Q15
C216
1800P
R226
10 1/2W
Q12 Q14 Q16
100P
C24
100P
R264
0.01
0.01
C211
C212
R337
∗
+
4700u56
+
4700u56
MODEL
UNIT No.
A
10
Q19-22
PRE-SW
DRIVER
B R335-338
YES
NO
C26
0.22
R51
1.5K
C27
S3
HPF ON/OFF
/LPF ON
REFERENCE
REGULATOR
D37
R229
75
R230
75
D38
+
C218
3900u16
R55
0.47
C217
16
15
14
13
12
11
10
9
Q21
Q22
YES
NO
6.8K
9
10
3K
R56
5.0V5.0V
5.0V
5.0V
14.2V
14.2V
12V
0V
Q19
Q20
+
3900u16
11
R233
R234
W22
1.5K
1.5K
IC3
(3/4)
-15.2V
8
D30
C221
10u16
D54
R302C302
+
C28
10u16
+
6.8K
0.33u50
-3.3V
C215
R253
R258
R259
47K
R52
C304
0.22u50
+
+
0.01
10K
R255
33K
680
680
D32
Q27
C301
0.33u50
R301 6.8K
S3
10K
R256
D31
100
R260
C29
10u16
+
+
C303
C30
10u16
+
Q28
C222
0.33u50
R406
2.2K
R271
Q34
47u25
R320
1
2
3
4
R341
1K
10
9
D74 D73
R61
3
2
4.7K
47K47K
R53
+
33K
D28
+
R251
51K
D57
D58
R327
51
R328
51
D59
D60
C43 470P
R54
Q27,28
MUTING SW
DRIVER
Q26
R250
D27
4.7K
10K
R257
Q37
Q38
R65 4.7K
R62
11K
POWER
SW
30K
Q25
Q24
27K
R324
R325
5.6K
C321
10u35
R326
5.6K
27K
R323
R63R66
12
13
3.6K
R248
3.6K
R249
R247
Q24
OVER
VOLTAGE
DETECTOR
Q35
+
Q36
R322
24K
R67
4.7K
4.7K
11K
R68
11K
C42
14.4V
R246
D26
3.3K
15 1/2W
(1/4)
C41
47P
47P
10u35
R241
IC3
(4/4)
C206
+
IC3
3.3K
R244
R245
C320
0.1u50
+
R321
5.6K
D56
1
14
3.3K
D25
3.3K
C39
10u16
+
C40
10u16
+
D55
R342
NAME
X09-5600-10
KAC-7251
X09-5600-11
KAC-7201
IC2
(1/4)
1
R45
R47
10K
22K
C23
R48
22K
IC2
(4/4)
14
10K
D40
4
5
6
IC2
BASS BOOST
AMP
+
C223
D39
10u16
10K
R267
10K
R280
D34
W24 W23 W21
R261
R262
15.2V
IC3
(2/4)
10K
1K
C224
1000P
R263
10u16
7
D78
16K
C225
R49
1.5K
C25
0.47
IC3
MIXIING AMP,
LPF,BUFFER
2.4V
0V
0.46V
3.3V
0V
0V
14.2V
+
LPF FREQ
VR2
10K(C)
R50
2.4K
IC5
SW REGULATOR
CONTROL IC
IC5
1
2
3
4
5
6
7
8
4.7K
R239
4.7K
R240
R232
10
OSCILLATOR
R231
J5
4
3
2
1
1K
1K
R343
T4
T3
T2
R69R70
47K 47K
L2
L1
W26
C232
T1
C117
R159
0.047
4.7
R160 C118
4.7 0.047
W27
10u16
D23
IC1-3 : NJM2058M
IC5 : UPC494GS
IC7 : TC4052BF(N)
Q1 : 2SD2375
Q2 : 2SB1548(P)
Q3,4,19,20,24,25,27,29,400,
401,403 : 2SC945(A)(Q,P)
Q5,6,34,35,37 : 2SC1845(F,E)
Q7,8,36,38,101-104: 2SA992(F,E)
Q11-16 : FKV550T
Q21,22,28,402 : 2SA733(A)(Q,P)
Q26 : 2SA1534A(R,S)
Q105,106 : 2SA1123(Q,R)
Q107,108 : 2SC4137(V,W)
Q109-112 : 2SC2631(Q,R)
Q113-116 : 2SC2235
Q117-120 : 2SA965
Q121,122,125,126 : 2SC4467
Q123,124,127,128 : 2SA1694
D1-4,7-16,27,28,31,32,34,37-40,
45-48,55-60,78,101,102,400
D17,26 : RD16JS(B)
D23 : RM4ZLF-J1
D24 : MA3056WA
D25 : RD7.5JS(B)
D30,54 : RD10JS(B)
D41 : FML22S
D43 : FML22R
D49,50,73,74
D71,72
D100 : B30-1669-05
WH1 CN1
FAN
33
0.01
LED
C233
2
GND
11
KAC-7251/7201
∗
B
REMOTE
JACK
SWITCH UNIT (X16-2390-10)
J1 S3
4
3
+6dB
2
+9dB
1
+12dB
D1
D2
D1,2: 1SS133
SIGNAL LINE
GND LINE
B LINE
B LINE
J2
Lch+
Lch-
SP OUT
RchRch+
GND
P-CON
BATT
F1
J3
F2
(30A)
((X09- ) B/2)
2
D100
C60
0.01
(30A)
: 1SS133
DA204K:
RD8.2JS(B):
CN3
2
1
POWER
LED
W25
BASS BOOST
CONTROL SW
FAN
CAUTION : For continued safety, replace 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 acceptably insulated from the supply circuit) before
the appliance is returned to the customer.
7
• DC voltages are as measured with a high impedance voltmeter. Values may vary slightly due to variations
between individual instruments or/and units.
2SA1123
2SA1534A
2SA733(A)
2SA965
2SA992
2SC1845
2SC2235
2SC945(A)
2SC4467
B
C
E
65
2SC4137
E
C
B
2SB1548 TC4052BF DA204K UPC494GS NJM2058M2SC2631
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