Kenwood KAC-7201, Service Manual

Page: 4 / 10

6 5
A B C D E F G H I J
1
2
3
4
5
6
7
WH1 CN1
Lch
Rch
J1
D3
D1
(2/4)
IC1
D47
D45
D4
D48
D2
D46
(3/4)
IC1
J4
IC1
(4/4)
S1
(1/4)
IC1
IC2
(3/4)
IC2
(2/4)
S2
(1/4)
IC2
IC2
(4/4)
(2/4)
IC3
S3
IC3
(3/4)
(4/4)
IC3
(1/4)
IC3
D7
D9
D101
D11
Q101 Q103
Q109 Q111
Q5
Q107
Q7
Q115
Q113
Q3
D15 D13
Q119
Q117
Q123
Q121 Q125
Q127
D8
Q4
D14 D16
Q120
Q110
D10
Q112
Q118
Q116
Q104 Q102
Q8
Q6
D102
Q108
D12
Q124 Q128
Q122
Q114
Q126
Q106
Q105
J2
D23
CN3
D32 D31
D30
D26 D25
D28 D27
Q25
Q24
Q27
Q28
Q26
REFERENCE REGULA
T
O
R
OSCILLA
T
O
R
D34
D37
Q19
Q21
Q22
Q20
D38
D41
D43
Q29
D17 Q1
FAN
GND LINE
SIGNAL LINE
IC1-3 : NJM2058M
IC7 : TC4052BF(N)
IC5 : UPC494GS
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
: 1SS133
D17,26 : RD16JS(B)
D23 : RM4ZLF-J1
D24 : MA3056WA
D25 : RD7.5JS(B)
D30,54 : RD10JS(B)
D41 : FML22S
D43 : FML22R
D100 : B30-1669-05
ISOLATION
AMP
BASS BOOST
AMP
MIXIING AMP,
LPF,BUFFER
+15V
AVR
MUTING
SW (Lch)
1st-STAGE
AMP(Lch)
DIFFERENTIAL
CURRENT
MIRROR(Lch)
2nd-STAGE
AMP(Lch)
DIFFERENTIAL
DETECTOR
(Lch)
OVER LOAD
COMPENSATOR
(Lch)
TEMPERATURE
POWER AMP
DRIVER(Lch)
POWER AMP
(Lch)
1st-STAGE
AMP(Rch)
DIFFERENTIAL
MIRROR(Rch)
CURRENT
DIFFERENTIAL
AMP(Rch)
2nd-STAGE
DETECTOR
(Rch)
OVER LOAD
POWER AMP
(Rch)
DRIVER(Rch)
POWER AMP
TEMPERATURE
COMPENSATOR
(Rch)
DC
DETECTOR
OFFSET
SW
DRIVER
DRIVER
PRE-SW
SW
POWER
VOLTAGE
OVER
DETECTOR
MUTING SW
DRIVER
SW REGULATOR
CONTROL IC
D24
LINE IN
ST/MONO
INPUT
SENS
LPF FREQ
-15V
AVR
Q2 D18
SP OUT
J3
BASS BOOST
OFF(RM)/+12dB
SPEAKER
INPUT
LEVEL
D72
D71
4-ch
MULTIPLEXER
D74 D73
REMOTE
JACK
J5
Q12 Q14 Q16
Q11 Q13 Q15
D56
Q36
Q35
Q34
Q37
Q38
D58
D57
D59
D60
Q402
Q403
D400
Q401
Q400
D55
D100
D71,72
D49,50,73,74
RD8.2JS(B) :
DA204K :
POWER
LED
D78
D39
D40
D54
SW (Rch)
MUTING
IDLE
ADJ
IDLE
ADJ
LINE OUT
Lch
Rch
D49
D50
/LPF ON
HPF ON/OFF
B
∗
∗
A
J1 S3
D1,2 : 1SS133
CONTROL SW
BASS BOOST
D2 D1
2
1 1
2
1000P
1000P
R2
C2
1K
R1
1K
C1
10K
C4
R4
10u16
+
10K
10u16
C3
R3
+
7
C5
15P
R5
R7 10K
10K
5
6
4
10K
R9
C8
R8 10K
R6
10K
C6
15P
C9
8
10
9
11
C100
R100
10K
R10
0.01
0.01
R14
47K
R13 2.2K
C13
C14
10u16
10u16
C12
10u16
+
2.2K
+
+
R20
47K
47K
R21
R22
47K
10u16
C11
+
R19
62K
R16
62K
62K
R18
62K
R17
R15
1
2
R25 10K
3
12
13
14
R26 10K
C15 15P
15P C16
10K
R11
R12
10K
C17 15P
C18 15P
1K
1000P
10K(A)
10K
R23
10K R24
430
R27
R28
430
VR1
9
10
8
11
5
6
4
7
22K R31
22K R32
0.22
C20
0.22
C19
300
R33
300
R34
680
R35
220
R39
330
R37
680
R36
330 220
R38 R40
2.2K R43
2.2K R44
R41
2.2K
2.2K
R42
3
2
1
12
14
13
C23
100P
10K
R46 10K
100P
C24
22K
R48
22K
R47
6
5
7
4
0.47 C25
1.5K
R49
2.4K
R50
1.5K
R51
C26
0.22
C27
11
10
9
8
47K R52
10u16
+
C28
10u16
+
C30
10u16
+
C29
R53 47K
47K R54
3
2
1
13
12
14
R61
4.7K
4.7K
R67
47P
C41
47P
C42
11K
R68
47K
47K
10u16
+
C39
10u16
+
C40
220
VR3
2.2K
R101
22u25
+
C101
1000P
C103
13K
R103
10K
R205
1K
R107
1K
R109
4700P
C105
100
R111
6.8K
R105
47P
C107
330P C111
1K
R113
+
C109
47u25
150
R125
+
C205
220u50
10
R207
6.8K R121
1000P
C115
150
R119
150
R117
470P C121
1.8K
R127
100
R131
4.7
R137
4.7
R135
470P
C207
1K
R219
470P C209
1K
R221
100
R133
22P
C113
510
R129
6.8K
R123
13K
R115
33
R163
1/2W
4.7
R141
4.7
R139
680
R217
C123
470P
680
R215
220
R161
0.1
R153
0.1
R151
4.7
R145
4.7
R143
2W
2W
4.7
R147
4.7
R149
2W
R155
0.1
2W
R157
0.1
150
R104 C104
1000P
10K
R206
2.2K
+
22u25
R102 C102
4.7
R146 R150
R110 R108
1K 1K
13K
+
47u25
C110
150
470P C128
R126
R134
100
4.7
R140
4.7 4.7
C210
C208
1000P
C116
R106
6.8K
R124
C106
4700P
R112
100
R114
C112 330P
1K
13K
R116
47P
C108
R130
510
6.8K
C130
22P
VR4
220
R122
R164
R132
6.8K
R128
1.8K
33
100
150
R120
470P
C126
R216
470P R220
1K
R218
R154
0.1
2W
R142
680
R162
1K
R222 470P
680
220
R152
0.1
2W
2W
0.1
R158
R156
0.1
2W
4.7
R138
4.7
R144
4.7
R148
R136
4.7
R118
GND
Lch+
Lch-
Rch-
Rch+
F1
P-CON
C117
0.047
R159
4.7
R160 C118
4.7 0.047
BATT
L1
L2
680
R259
33K
R255
680
R258
10K
R256
100
R260
+
C222
47u25
10K
R257
10u16
C221
+
30K
R250
3.6K
R248
3.3K
R246
3.3K
R244
3.6K
R249
3.3K
R245
3.3K
R247
4.7K R251
10u35
+
C206
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
10u16
+
C225
R263
1000P
R262
47K
R270
C224
16K
1K
+
C223
10u16
R261
10K
27K
R269
27K
R268 330K R266 C227
2.2u50
R264
10K
10K
R267
91K
R265
+
C226
0.1u50
R281
1K
TH2
T
H3
TH1
4.7K
R239
10
R231
R229
75
1.5K
R233
R253
10K
33K
R271
R234
1.5K
R230
75
10
R232
R240
4.7K
L4
R274
C228
+
100u6.3
22K
10K
R273
+
C203
47u25
120
R201
13K
R203
+
C201
47u25
R69
R70
150K
R252
100K R254
IC1
IC2
IC3
Q101,103
Q105
Q109,111
Q5,7
Q107
Q113,115,117,119
Q121,123,125,127
Q102,104
Q106
Q110,112
Q6,8
Q122,124,126,128
Q114,116,118,120
Q108
Q11-16
Q19-22
Q24
Q27,28
VR2
10K(C)
R202
120
+
C204
47u25
R204
13K
C202
47u25
+
F2
1
2
IC5
11K
R62
4.7K
R63
R66 11K
16 15 14 13 12 11 10 9
VDD
X2
X1
XCOM
X0 X3
A B
1
2 3 4 5 6 7 8
Y0 Y2 YCOM Y3 Y1 INH VEE VSS
2.2u50
C21
C22
2.2u50
R333
R334
220K
220K
220K
∗ R335
220K
∗ R336
1.2K
∗ R338
1
3
7
5
9
2
4
6
8
10
L+
L-
R-
R+
C72 0.01
C71
0.01
47K
R332 R331
47K 100
R339
R340
100
9
10
L
L
B
H
H H
INPUT
H
A
L
L
X2,Y2
X3,Y3
X1,Y1
ON
X0,Y0
CHANNEL
R342
1K
R343
1K
1K
R341
10
9
1
2
3
1.2K ∗ R337
R45
15
14
12
13
10
11
9
2
3
4
5
6
7
8
1
C214
1500P
R224
10 1/2W
R223
10 1/2W
C213
1500P
R211
33K
R212
33K
4700u56
C211
+
4700u56
C212
+
2.2u100
C230
2.2u100
C231
++
W29
R321
5.6K
51K
R320
10u35
C321
+
5.6K
R326
5.6K
R325
R322
24K
27K
R324
27K
R323
51
R327
R328
51
C400
0.01
12K
R401
12K
R404
2.2K
R403 C402
0.01
R402
10K
100u6.3
C403
+
R405
6.2K
R406
2.2K
C215
0.01
47K
R209
47K
R210
W27
W26
3 3
15 1/2W
R241
C233
0.01
4
3
2
1
0.1u50
+
C320
FAN
LED
GND
C60
0.01
1
3
4
2
(30A)
(30A)
R280
10K
1K
R400
C232
10u16
10 1/2W
R226
1800P
C216
W24 W23 W21
W22
3900u16
C217
+
3900u16
C218
+
C125 470P
VR3
C127
470P
22P
C129
470P C122
470P C124
VR4
22P
C114
1000P
C219
1K
R29
1K
R30
C165
4700P
R165
220
C51 15P
10u16
+
C53
C52
+
10u16
C50 15P
10u35
C229 +
R56
3K
0.47
R55
6.8K
0.33u50
C301
+
0.33u50
C303
+
R301 6.8K
+
C304
0.22u50
6.8K
R302
C302
+
0.33u50
S3
C43 470P R65 4.7K
2.2K
2.2K
2.2K
W25
X09-5600-11
UNIT No.
X09-5600-10
NAME
MODEL
KAC-7251
KAC-7201
A
YES
NO
B R335-338
YES
NO
T2
T1
T3
T4
4
3
2
1
+6dB
+12dB
+9dB
4
15.2V
8.3V
-15.2V
15.2V
-15.2V
15.2V
-15.2V
2.4V
5.0V 5.0V
0V
0.46V
0V
14.2V
3.3V
0V
5.0V
5.0V
14.2V
14.2V
12V
0V
14.4V
-3.3V
-8.3V
((X09- ) B/2)
(X09-5600-1x) (A/2)
IC5
KAC-7251/7201
IC7
SWITCH UNIT (X16-2390-10)
B LINE
B LINE
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.
• 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
B
C
E
2SC4467
E
C
B
2SC4137
B
E C
2SB1548 TC4052BF DA204K UPC494GS NJM2058M 2SC2631
2SC945(A)
KAC-7201/7251 KAC-7201/7251
w w w . x i a o y u 1 6 3 . c o m
Q Q 3 7 6 3 1 5 1 5 0
9 9
2
8 9
4 2
9 8
T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
Q Q
TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299