Kenwood KAC-8101-D, KAC-8151-D Service manual
POWER AMPLIFIER
KAC-8101D/8151D
SERVICE MANUAL
()
© 2003-2 PRINTED IN JAPAN
B53-0040-00 (N) 3114
Heat sink
(F01-1729-11)
Dressing panel
(A21-4271-03) : KAC-8151D
(A21-4288-03) : KAC-8101D
Connecting cord assy
(E30-6145-05)
Screw set
(N99-1740-05)
Accessory
(W01-1606-05)
Screw set
(N99-1587-05)
Dressing plate
(B03-5024-14)
Panel
5
KAC-8151D only
Control assy
Knob
(K23-1076-03)
KAC-8151D only.
(A64-3054-02)
: KAC-8151D
(A64-3094-02)
: KAC-8101D
Rear panel
(A84-0348-02)
Modular cable
(E30-6240-15)
KAC-8101D/8151 D
WIRED
REMOTE
CONTROL
+0/+6/+9/+12dB
BLOCK DIAGRAM
INPUT
BATT
P. CON
GND
ISO AMP
+
VOL BOOST
0.2-5.0V
CONVERTER
SW
COMPONENTS DESCRIPTION
BASS LOWPASS INFRASONICINPUT
+12dB/OFF 50-200Hz
-15V AVR +15V AVR
TRANSFORMER
FILTER FILTER
THERMAL
PROTECTION PROTECTION
OFF/15/25Hz
D CLASS AMP
COMPEARATE
++
AMP
(DEA T TIME)
EXPANDER
ON/OFF MUTE
TRIANGLE
WAVE
OVELOAD DC OFFSET
POWER
AMP
PWMMIX
PROTECTION
OUTPUT
OUTPUT
AUDIO UNIT (X09-5480-1x)
Ref No. Application / Function
IC1 Isolation amplifier
IC2 Bus boost amplifier
IC3
IC4 Expander amplifier
IC5 DC detection rectification amplifier
IC6 Expander detection and difference output
IC7
IC8
IC9
IC10,11 Dead time generator
IC12 Bus boost level changer
IC15 DC/DC converter
Q1 Mute
Q3~5 Output FET control (current amplifier)
Q7~10 Output FET control (current amplifier)
Q11~14 Output FET driver
(1/2) : Lowpass filter amplifier
(2/2) : Infrasonic amplifier
(1/2) : Triangular waveform generation
(2/2) : Summing amplifier
(1/2) : ASO (current, voltage comparison) detection
(2/2) : DC converter control
(1/2) : Triangular waveform generation
(2/2) : PWM waveform generator
Ref No. Application / Function
Q15,16 Output FET
Q17~20 Speaker output current detection
Q21,22 Output FET control power supply and control
Q23~25 DC protection
Q26,27 ASO DC detection
Q28 IC8 (2/2) output logic invert
Q31 Reduced voltage protection
Q32 Over voltage protection
Q34 DC/DC converter power supply
Q36 DC/DC converter control
Q37~40 Power FET driver
Q41~46 Power FET
Q47~50 Small-signal ± power supply
Q51,52
Q53 Power FET control power supply
Q55 Mute, LED and protection control
Q61~64 Power FET driver
Q65,66 Power FET
When OFF, quick break in a circuit of – power
supply for small-signal circuit
2
A B C D E
C154
2
S
KAC-8101D/8151 D
1
PC BOARD (FOIL SIDE VIEW)
AUDIO UNIT X09-5480-1x A/2 (J74-1502-11)
C275
R277
R282
R281
R279
R283
W61
W403
C273
R280
R274
C272
R275
D41
W503
916
W504
Q41
L2
W50
R160
W60
W58
C152
W53
IC15
W52
R183
R284
W51
Q16
18
R273
R278
C151
D42
C276
W48
W996
W43
W49
Q39
W47
W41
W34
W35
W46
W45
W33
W39W57
W44
Q37
BE
BE
R301
R305
R307
W40
W42
C314
C313
W36
D43
R303
W501
W502
W997
R161
R181
R185
W3
R304
R
R309
R163
C153
R157
GSDGSDG
Q23
C231
BE
BE
R212
R215
Q24
D22
C203
D21
2
C204
R217
C202
Q27
C206
BE
9
10
EB
R8
J3
1
2
42
31
3
OUT
IN
W515
R10
R7
R12
R11
W516
R9
J4
C5
R41
C4
R43
R42
R6
R5
R21
C11
R13
C3
W201
C1
C10
C9
W206
W203
W204
W209
C2
R1
R2
D72
J1
D71
4
VOL
INPUT
OFF/+12dB
BASS BOOST
5
IFS
OFF/15Hz/25Hz
LPF
6
EXP
OFF/ON
W210
D54
D56
D57
D55
R50
R49
C39
C40
S1
IC12
18
S2
C59
W216
R52
W217
C55
W213
R61
C60
S3
R64
W215
W212
W211
R66
W214
VR1
W198
W199
W200
C28
R29
R36
R37
R35
R47
R38
W513
C35
R34
916
R33
R48
IC2
14
C33
R56
R32
R51
W208
R40
R39
C36
R55
W207
VR2
W514
W196
8
5
IC4
R67
R65
14
W205
C71
R68
C65
C67
C69
81
7
R231
R232
R213
R216
IC5
5
W202
C205
Q26
C6
D3
R4
R3
58
R31
C53
C54
IC3
58
R54
C57
R62
R63
C68
R211
R214
R218
14
8
R222
R219
C201
W197
W194
R220
W512
C8
C7
D4
R22
C23
4
IC1
58
C26
R25
C38
W193
W195
14
C62
IC6
C66
W511
W183
W192
D20
D19
D2
R23
C24
C34
C31
W510
C32
W186
C61
C72
Q25
W184
D1
1
R26
C25
D58
W191
C58
R69
R233
W190
Q28
W178
W179
R24
R27
R45
R46
D59
W189
W177
W180
C52
C51
C64
R234
BEBE
W173
W176
W185
C193
EB
IC8
58
R221
R200
C195
R201
D75
D73
D74
D76
W174
C22
C21
W182
C27
W175
R28
W168
W170
C37
W188
W181
W187
C63
169
Q34
W509
W171
R71
C232
14
R205
W172
Q33
R255
BE
R261
C254
W167
W165
R202
R196
C194
W169
W166
R72
C319
WH1
13
R101
R102
R113
W163
W155
W158
W161
D16
R135
W164
R319
R321
R323
Q52
R316
R262
R198
R197
R203
R199
W162
R131
Q51
C253
D37
R260
W157
D40
D38
D46
R174
BE
Q21
W159
Q22
BE
R173
R171
W160
D53
R324
D51
D52
D50
C105
D6
D7
R111
R112
R105
R106
R108
D11
D12
D10
D8
D5
C111
R114
Q1
R122
C112
EB
R117
R116
R115
D17
814
R136
D13
W156
BE
R142
BE
BE
Q7
W152
R141
W153
W154
BE
R320
R322
BE
C318
R318
BE
Q48
C316
C255
D39
BE
Q53
D49
W149
D9
C114
R118
R123
C113
17
Q4
R146
Q3
W151
R266
W140
W141
W142
C171
R172
C320
R325
R326
W147
C106
C103
14
IC7
58
R119
R120
R121
W146
C131
R147
R148
Q5
BE
Q9
W150
W148
D48
D47
R315
Q32
R265
R267
D62
W125
C256
R264
Q55
W120
C257
R263
R259
D36
BE
R258
BE
D35
R257
R256
D34
R253
BE
R251
D45
W105
W106
W130
W131
W132
D18
R314
W137
W143
W127
W138
W123
W129
W144
R104
R107
W119
C104
W121
W122
C102
814
W508
W134
C115
W139
W124
W128
W133
C132
R133
C133
R134
W136
BE
W126
R149
R150
BE
BE
Q8
W145
C317
W135
BE
C315
Q47
W107
W108
W109
W103
R313
C321
W112
W116
W117
W114
R103
W115
C101
IC9
17
R124
W113
R132
17
IC10IC11
W118
W111
R144
R143
BE
BE
BE
BE
BE
BE
BE
BE
BEBE
814
D14
D15
R145
Q63
Q13
Q64
Q10
Q12
Q50
R317
W90
Q36
C252
C271
C274
BE
R254
R252
R272
Q31
D33
W99
W91
W79
R271
D60
R276
D30
SDG SDG SDG SDG
Q45 Q46
W104
W75
W76
W93
W94
W95
W96
W97
W98
R312
R311
C310
C309
C312
C311
W101
W110
Q49
W102
Q61
Q11
Q62
Q14
W100
W92
W89
W506
W507
W88
R154
W84
W85
R186
W86
W87
R156
W82
W72
W83
R151
R155
R153
R152
W404
W70
W69
W80
W81
W77
W78
W74
W67
W62
W73
W59
R158
R182
W54
W55
W56
Q66
R162
W505
R184
W63
W64
W71
W65
W66
Q43
W68
4
JIHGF
6
W44
R305
KAC-8101D/8151 D
1
SWITCH UNIT
X16-2390-10
(J74-1534-02)
W32
Q37
BEBE
9
BE
R301
R307
GSDGSDG
W40
W42
41
C314
C313
D43
R303
W501
W502
W997
R163
R304
R308
R309
Q44
R302
W22
C304
BE
D44
R306
W405
W17
W18
W19
W20
W21
Q38
Q40
W998
L3
L4
C303
Q42
TH1
W15
W13
W2
D31
D32
W3
W4W5W6
W7
W8
W9
C251
67
C302
J2
C155
C156
5
4321
W1
D2
S1
24
31
J1
D1
BATTGND
P-COM
X09-5480-1x
IC Q Address
13B
25B
35B
46B
52B
67B
75C
82B
95D
10 5D
11 5C
12 5B
15 2E
15C
36C
46C
56C
76C
86C
96C
10 6C
11 6D
12 6D
13 6D
14 6D
15 6F
16 6E
17 7G
18 7F
19 7F
20 7G
21 3C
22 3C
23 1B
IC Q Address
24 2B
25 1B
26 2B
27 2B
28 2B
31 2D
32 1D
33 1C
34 2C
36 1D
37 2E
38 2F
39 2E
40 2F
41 2E
42 2F
43 2E
44 2F
45 2D
46 2E
47 7C
48 7C
49 6D
50 6D
51 6C
52 6C
53 3C
55 2D
61 6D
62 6D
63 6D
64 6D
65 6F
66 6D
2
3
4
5
W39
35
W36
33
34
R161
R181
R185
C153
C154
R157
Q65
W16
W14
C192
R192
W11
W12
W10
Q15
Q18
Q19
SDGSDG
R159
R191
EBEB
R195
R193
Q17
R194
BEBE
C191
Q20
X09 B/2
D401
CN1
13
C401
Refer to the schematic diagram for the values
of resistors and capacitors.
6
7
5
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