KENWOOD POWER AMPLIFIER KAC-8401 SERVICE MANUAL

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KAC-8401
1
X09-5610-10 IC
31 R32

Q

Address 3B 5B 3B 4B 4B 6B 5B 4E

IC

Q 34 35 36 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218

Address 7C 2C 7D 5E 5D 5F 5D 5F 5D 5E 5D 6F 6D 7G 7E 7G 7D 6G 6E 6F 6D 4C 5D 4D 5D 4C 4D 4C 4C 2C 6C 1C 7C 2D 7C 2C 6C 2C 6B

1
Q10
E B

11

Q12
E B

2 3

W39
R33 R35 R36 R34

D15

4 5

R37 R38

D9

6 7

2

Q13

Q14

Q16

S D G
W38

S D G

S D G

D1

8 1 2

W20 W21
W34

4F 4G 4F 3C 5F 3C 3C 4F 2E 2F 2E 2E 2F 2F 2E 2F 2D 2D 4E 4F 4F 4E 4D 5E 5C 6G 7D 7F 6E 4C 4C 1C

7

L1
W406 W405

J3

3 4 5 6

W404

W26 W12 W23 W24
TH1 W403

7 8
11

3

W25

9 10

W44 L2 W14 W524 W15
W37

11
C309

12
10

13 14 15

W402

C45

C10
R25

Q3

C52
R5

C46
W10

E

R4

Q1
EB
B

R6

B

9
W502 W501

16 17 18 20 21 22 23

Q8 E B

R50
R29

4

R24

D39

E

D4

3

R7

Q5

D3
R79

R1
R74 R72 R71 R73

R2

Q22 E B

Q21 B E

W33

W29

C25

W5 W17 W18 W11 R327 W7 W8 R325
W401

W2

D2 Q2 R3
8

7

BE

5

6

24 25

Q103

W31

W27

W19 W9 W6

R161 C175

3

4

26 27 28

C155

5

E

Q105 R165

R163

B

C157

5

C159 C163
W28

R159

C161

B

1
W275

2

29 30

R328

R192

W32

R292

ALch
R326

C192

C292

W36

R169

E

31
X09 B/2
C191 C291

VR5

32 33

C165 W35 3 W16 W30 R173 W13

R291 R191

2 1

Q27
B
R55

CN2 D13 CN1
3 1

Q115 Q117
B E E

E
C17 R51

Q109
B B E

ALch

C8

D5

R187

6

R171

D25
56 18 R53 R57 C19 W4

R175 R321 W22 R189

D23

B

C167

DC Voltmeter
E

R181

R185

E

Q29

R177

R183

E
C169

B

R179

Q111

Q113

IDLE CURRENT : 2.5mV

B

C51

Refer to the schematic diagram for the values of resistors and capacitors. 7

5

A

B

C

D

E

KAC-8401
1
(X09-5610-10) (A/2)
D101
15.8V
5
C105 15P

4

IC1(1/4)
R109
C113 15P

C119 0.047

R139 10K

IC1 (2/4)
7 3 2
R123 10K

6 R107 10K

1 R125 10K C131 15P

10K
R113 82K

C33 0.01

C115 10u16 +
R127 22K

R129 10K

R131 10K

IC2(3/4)
0V 9 10
8 4 15.8V

LPF
C121 10u16 +
R145 22K

0V 0V

6 5

7

R133 10K

0V
12

R135 3K

R128 22K

1200P

C101

R103

10K

R105 10K

R137 C117 2.2K 0.33

R141 16K

2
C102

R100 1K R86 C171 220 4700P

S1
R144 22K

10K

HPF ST/ MONO
C132 15P R126 10K
R116 82K R124 10K C114 15P

R106 10K

C104 10u16 +
R101 1K R102 1K

R330 1K

R112 10K R108 10K

R138 2.2K

C118 0.33

R142 16K

0V
R136 3K

VR1 50K C116 10u16 +

C36 0.01

1200P

R104

2

0V

3

1

C106 15P

D100

10

8

12

C109 10u16 + C111 10u16 + C112 10u16 +

IC1(4/4)
R114 82K C34 0.01

IC7(1/4) R134 0V 3
0V
R130 10K 2 R132 10K 1 10K

IC2(2/4)
5 0V 6
C120 0.047

J1
C53 0.1

D102

IC1(3/4) ISO

7 11

C124 10u16 +

L

C110 10u16 +

R140 10K

10

-15.8V

3

LINE IN A R L

LPF

8

4

2 C150 22u16 +
R196 2.2K

R197
C126 1000P C55 470P

R195 2.2K R295 2.2K

300

C226 1000P

C56 470P

R L
C54 0.1

R297 300

R296 2.2K

LINE OUT

R194 2.2K C250 22u16 + R294 2.2K

LINE IN B R
R202 1K R201

AB/A S6

4

J2
9 10

1K

D200

R117 51K
R121 2.2K

R301 4.3K

10

15.8V
3 2 4

SPEAKER INPUT

7 5 3

8 6
R122 2.2K

R119 51K R120 51K

IC4(1/4)
1 R231 R233 10K 7
R235 3K

R146 22K

9

11

R110 10K

13

14

IC2(1/4)

HPF/ OFF/ LPF

R198

8 4
R303 4.3K

R239 10K
C219 0.047

C 10 +

4

R118 51K R218 51K

R222 2.2K

2 C210 10u16 + C212 10u16 + C211 10u16 + C209 10u16 +

R305 4.3K C301 100P

R229 10K

10K 6 5

-15.8V

IC4 (3/4)
0V 9 0V 10
11 8

0V

1

2

IC4(2/4) LPF

R220 51K R219 51K

IC6(2/2)
0V 0V
6 5 8
R309 300

R221 2.2K

5
D201

R217 51K

7

0V
C39 0.01 C305 2.2u50
R317 100K R311 3.6K

C217 0.33

0V 12 0V 13

IC4(4/4) C
14 10 + R241 16K

15.8V
R213 82K 82K

HPF IC3(1/4)
3
C213 15P C41 0.01

IC3 (2/4)
5 6 C203 10u16 +
C201 1200P R203 10K

C37

0.01

15.8V
4

R214

C303 0.22
R307 24K

R313 1.1K

7

2

1

R215 82K

R308 24K

C43 0.01

R227 22K

10K R87 220

R225 10K C231 15P

R304 4.3K

R310 300

R205 10K

R238 2.2K

ST/MONO
C200 1000P
R216 82K R224 10K

IC6 (1/2)
0V 0V
3 2 4

B B. ON/OFF
0V

R24216K C218 0.33

C202 1200P

R204 10K

R206 10K

R200 1K

S2

R302 4.3K

1

6

0V 2 0V 3

1

R228 22K

C214 15P

R208 10K
C206 15P

R226 10K 13 12 14

C302 100P R306 4.3K R230 0V 10 10K 0V 9

R236 3K

C204 10u16 +

R332 1K

R212 10K

-15.8V
C232 15P

C40 0.01

HPF

C2 10u +

IC5(1/4)
0V 5 0V 6

IC5(2/4)
7 11

IC5(3/4)
8 R232

LPF
C220 0.047

9 10

11

8

R210 10K

C216 10u16 +
C38 0.01

R234 10K

R240 10K

-15.8V
C 10 +

D202 ISO

IC3(3/4)

IC3(4/4)
-15.8V

13 12 4

14

10K

IC5(4/4)

15.8V

7

6

X09-5610-10(1/3)

R244

C271 4700P

S5

R316 4.3K

R211 10K

C304 0.22

C306 2.2u50

R318 100K

R312 3.6K

R314 1.1K

R315 4.3K

R331 1K

C205 15P R207

R223 10K

C215 10u16 +

BASS BOOST

R243

R209 10K

R237 2.2K

VR2

15K

-15.8V

C122 10u16 +

R143 22K

C100 1000P

R115 82K

C35 0.01

C103 10u16 +

R329 1K

0V

13

S3

100

14

R199

R111 10K

IC2(4/4) IC7(2/4)

C123 10u16 +

F

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KAC-8401
-5.0V
C173 4700P R171 2.7K
R175 1.5K

R169 2.7K R321 33 R177 100 C167 47P
C4 1u50 +

14.8V

R150
R199 100

VR5 220

R155 8.2K C159 10P R165 43K
R163 1K

C163 10u35 +

R149 470

D23

Q111

R183 Q115 4.7 R51 1.5K

R173 430

470
C175 100P

C165 1000P

C17 470P

C19 470P

C155 R161 5600P 100

R153 43K

Q25
C128 10u16 +

C153 680P

Q29 Q105 Q107 C161
82P

C157 47u25 +

MUTE
R59 3.3K

D25
R179 100

R185 4.7

Q117 Q113

R157

R159 820

820

IC7(4/4)
R60 3.3K R158 C154 680P R154 43K 820

D22
C158 47u25 + R160 820 R168 82

R180 100

47P

14

C170

/ /

R198

15.8V
15K

0V 12 0V 13

4

C169 47P

D21

R167 82

C32 0.01

D27

R148 15K C130 47P

D26
C162 82P

Q114 Q118
R186 4.7 R54 1.5K
C20 470P R190 0.1 2W R58 1K

R162 C156 100 5600P

MUTE Q26

Q28 Q106
R164 1K

INVERTER

Q108

R189 0.1 2W

R57 1K

Q103

R53 1.5K

R23 30K

R151 C151 3K 10u16 +

Q101

Q27

R187 0.1 2W

R55 1K

VR3 10K

R181 220

R22

Q109

R166 43K
R174 430 C166 1000P

3

C18 470P

R182 220

Q102

Q30
R184 4.7

VR6 220

R156 8.2K

C164 10u35 +

C176 100P

Q110
R176 1.5K

D24

Q116
R322 33 R178 100 C168 47P

15.8V
R26 22K C15 22u25 +

Q17

R41 33 1/2W R43 3.9K

R172 2.7K

Q112

Q6
14.7V
C31 47u25 +

16V AVR
C13 22u25 +

R170 2.7K

C30 33u25 +

D18
C26 220u50 +

C14 22u25 +

D19
R44 3.9K R42 33

C16 22u25 +

R269 2.7K R271 2.7K
R275 1.5K

C307 10u16 +

-30.5V
R40 10

R323 33

R277 100

C267 47P

-15.8V

-15.8V
C221 10u16 +
C42 0.01

Q18 -16V AVR

1/2W

Q209
VR7 220

D33

Q211

11

C263 10u35 +

1/2W

R283 Q215 4.7 R61 1.5K

R273 430

C275 100P

C23 470P

R281 220

R319

C21 470P

R263 1K

C255 R261 5600P 100

C253 680P

R253 43K

14 10u16 + R241 16K

C273 4700P

C257 47u25 +

MUTE Q31
R249 470
R69 3.3K

Q35 Q205 Q207
C261 82P R279 100
R267 82 C269 47P

D35

R285 1.5K 4.7

R243 22K

R245 22K

R299

VR4

820

D29

R257

R259 820

S4

100

R250 470

Q217 Q213

D31

C270

HPF/OFF/LPF
R258 R244 22K R246 22K R260 820 820 R70 3.3K R268 82

R280 100

47P

Q214
R286 Q218 4.7 R64 1.5K
C24 470P R290 0.1 2W R68 1K R282 220 R66 1K

D28
R264 C258 1K 47u25 +

C254 680P

R24216K 1 C224 10u16 +
R298 15K

IC7(3/4)
10 9 11 8

MUTE Q32

R262 C256 100 5600P

0V
C228 10u16 +

R254 43K

C262 82P

D34

Q206
R266 43K

Q208 Q34

IC5(1/4) IC5(2/4)
7 11 C222 10u16 + C44 0.01 C308 10u16 +

R320 22K

0V
R248 15K C230 47P

C22 470P

R274 430

-15.8V

10P C276 100P
C264 10u35 +

C266 1000P

VR8 220

C50 0.01

R256 8.2K

V

Q36 D38

Q210
R276 1.5K

R284 4.7

Q216
R324 33 R278 100 C268 47P

R272 2.7K

Q212

R270 2.7K

R288 0.1 2W

R252 3K

C252 10u16 +

Q202

Q204

C260

R289 0.1 2W

R67 1K

IC4(4/4) C223

22K

R251 C251 3K 10u16 +

Q201 Q203

R265 43K

Q33

R287 0.1 2W

C259 10P

C265 1000P

8

R255 8.2K

R65 1K

R188 0.1 2W

R56 1K

R152 3K

C152 10u16 +

Q104

C160 10P

R52 1.5K

R63

R62 1.5K

X09-5610-10 (2/3)

7