© 2003-2 PRINTED IN JAPAN
B53-0040-00 (N) 3114
POWER AMPLIFIER
KAC-8101D/8151D
SERVICE MANUAL
5
Dressing panel
(A21-4271-03) : KAC-8151D
(A21-4288-03) : KAC-8101D
Heat sink
(F01-1729-11)
Connecting cord assy
(E30-6145-05)
Accessory
(W01-1606-05)
Screw set
(N99-1587-05)
Control assy
Modular cable
(E30-6240-15)
Screw set
(N99-1740-05)
Dressing plate
(B03-5024-14)
Knob
(K23-1076-03)
KAC-8151D only.
()
KAC-8151D only
Rear panel
(A84-0348-02)
Panel
(A64-3054-02)
: KAC-8151D
(A64-3094-02)
: KAC-8101D
KAC-8101D/8151D
2
BLOCK DIAGRAM
TRANSFORMER
+
++
ISO AMP
INPUT
0.2-5.0V
VOL
BOOST
+12dB/OFF
50-200Hz
FILTER
FILTER
OFF/15/25Hz
BASS
LOWPASS
INFRASONIC
INPUT
REMOTE
+0/+6/+9/+12dB
WIRED
CONTROL
EXPANDER
ON/OFF
MUTE
-15V AVR
+15V AVR
BATT
P. CON
GND
CONVERTER
SW
TRIANGLE
WAVE
PWM
MIX
AMP
COMPEARATE
(DEAT TIME)
POWER
AMP
D CLASS AMP
OUTPUT
OUTPUT
THERMAL
PROTECTION
PROTECTION
OVELOAD
DC OFFSET
PROTECTION
AUDIO UNIT (X09-5480-1x)
Ref No.
Application / Function
IC1
Isolation amplifier
IC2
Bus boost amplifier
IC3
(1/2) : Lowpass filter amplifier
(2/2) : Infrasonic amplifier
IC4
Expander amplifier
IC5
DC detection rectification amplifier
IC6
Expander detection and difference output
IC7
(1/2) : Triangular waveform generation
(2/2) : Summing amplifier
IC8
(1/2) : ASO (current, voltage comparison) detection
(2/2) : DC converter control
IC9
(1/2) : Triangular waveform generation
(2/2) : PWM waveform generator
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
COMPONENTS DESCRIPTION
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
When OFF, quick break in a circuit of power
supply for small-signal circuit
Q53
Power FET control power supply
Q55
Mute, LED and protection control
Q61~64
Power FET driver
Q65,66
Power FET
KAC-8101D/8151D
A
B
C
D
E
1
2
3
4
5
6
7
4
PC BOARD (FOIL SIDE VIEW)
OUT
IN
EXP
INPUT
VO
L
OFF/+12dB
OFF/15Hz/25Hz
B
ASS
BOOST
LPF
OFF/ON
IFS
D6
D13
D7
D2
D4
D55
D57
Q50
D1
D3
D54
D56
Q25
Q27
Q49
Q51
Q33
Q37
J1
J3
D9
D12
D18
D20
D37
D47
D48
Q1
Q14
Q23
Q24
Q26
Q31
Q32
Q36
Q39
Q41
Q43
Q45
Q46
Q52
Q55
Q62
D5
D8
D10
D11
D14
D15
D16
D17
D21
D22
D33
D34
D35
D36
D38
D39
D40
D43
D45
D46
D49
D50
D51
D52
D53
J4
Q3
Q4
Q5
Q7
Q8
Q9
Q10
Q11
Q12
Q13
Q16
Q21
Q22
Q34
Q47
Q48
Q53
Q61
Q63
Q64
Q66
D60
D19
D76
D58
D59
D74
D75
D73
D72
D71
S3
S1
S2
WH1
D30
D41
D42
D62
Q28
W163
C106
R102
C131
R131
C105
R101
C318
C317
C275
R7
1
3
1
4
2
2
9
10
R11
R8
R12
C63
C113
C115
C132
C133
C154
C193
C204
C231
C252
C253
C255
C273
C274
C311
C312
C313
C314
C315
C316
L2
W186
W211
R28
R141
R142
R171
R313
R314
C1
C2
C3
C4
C5
C6
C7
C8
C28
C33
C34
C55
C57
C58
C59
C65
C69
C72
C103
C111
C153
C203
C272
C276
C319
C320
C321
R1
R2
R9
R10
R41
R42
R124
R143
R144
R145
R146
R151
R152
R153
R154
R155
R156
R163
R173
R181
R182
R183
R184
R185
R186
R259
R260
R311
R312
R315
R316
R317
R318
R326
W95
W196
W403
W404
W40
W45
W42
W52
W51
W53
W46
W49
W48
W32
W169
W94
W93
W104
W105
W106
W140
W141
W142
W63
W77
W82
W86
W96
W97
W98
W107
W108
W109
W130
W131
W132
W64
W58
W88
W35
W34
W33
W55
W56
W54
W72
W70
W69
W74
W73
W71
W78
W83
W87
C151
C152
W101
W110
W112
W114
W116
W117
W148
W151
W50
W135
W60
W61
W36
W39
W57
W62
W150
W68
W84
W81
W80
W85
W152
W89
W92
W146
W124
W133
W128
W111
W156
W102
W139
W100
W154
W153
W164
W123
W145
W127
W138
W129
W155
W161
W144
W158
W162
W103
W170
W44
W47
W67
W41
W137
W147
W143
W79
W91
W99
W157
W125
W171
W173
W165
W202
W167
W90
W66
W65
W176
W166
W215
W185
W190
W159
W160
W184
W183
W192
W194
W197
W113
W115
W121
W122
W134
W119
W149
W182
R43
W206
W204
W203
W209
W210
W175
W168
W178
W179
W201
W172
W174
W199
R45
R46
W200
W189
W212
W198
W193
W195
W188
W191
W208
W180
W177
W213
W216
W207
W217
W181
W187
W205
W214
W120
C60
C310
C309
R309
W59
W76
W75
SD G
S
D G
SD G
S
D G
S
W118
W126
W136
W43
W997
W996
VR1
VR2
C102
R132
C101
R103
C22
C32
C52
C62
C202
R112
R323
C21
C31
C51
C61
C194
C201
C232
R111
R174
R197
R198
C206
R218
R221
R234
R319
R265
C25
C36
C54
C64
C66
C67
C68
C112
C171
C195
C205
C256
C271
R25
R29
R31
R37
R52
R54
R56
R61
R63
R64
R67
R69
R108
R115
R116
R121
R149
R172
R196
R200
R212
R217
R220
R232
R252
R254
R264
R272
R274
R280
R281
R282
R284
R301
R307 R
R320
C23 C24
C26
C27
C35
C53
C71
C104
C114
C254
R3
R4
R5
R6
R13
R21
R22 R23
R24
R26
R27
R32
R33
R35
R36
R38
R40
R51
R55
R65
R66
R68
R71
R72
R104
R105
R106
R107
R113
R114
R117
R118
R119
R120
R123
R133
R134
R135
R136
R147
R148
R157
R158
R160
R161
R162
R199
W512
R211
R213
R214
R215
R216
R219
R222
R231
R233
R251
R253
R255
R256
R257
R258
R261
R262
R263
R266
R271
R273
R275
R276
R277
R278
R279
R283
R303
R304
R305
R321
R322
R324
R325
C9
W504
R122
W510
W502
W506
W505
W509
W511
W508
W515
C37
C38
R49
R50
C39
C40
R48
R34
R47
W513
W514
R267
R62
W501
R203
R202
R205
R201
C257
C10
W507
C11
W516
W503
1
8
916
1
4
5
8
1
4
58
1
1
3
4
58
5
8
14
1
4
58
1
4
58
5
8
14
1
7
814
1
7
814
9
16
18
R150
R39
16
9
81
1
7
814
IC9
IC6
AUDIO UNIT X09-5480-1x A/2 (J74-1502-11)
IC7
IC10
IC11
IC1
IC2
IC3
IC4
IC5
IC8
IC15
IC12
BE
B
E
B
E
BE
B
EB
E
B
E
B
E
B
E
B
E
B
E
B
E
B
E
B
E
BE
BE
BE
BE
B
E
E
B
BE
BE
BE
BE
BE
BE
BE
BE
BE
BE
EB
BE
B
E
B
E
B
E
B
E
B
E
BE
E
B
G
S
D
G
S
D
G
KAC-8101D/8151D
J
I
H
G
F
1
2
3
4
5
6
7
5
BA
T
T
GND
X09 B/2
P-COM
Q37
Q38
D31
D32
J2
39
Q40
Q42
Q44
6
D43
D44
Q15
Q17
Q18
Q19
Q20
Q65
CN1
D401
C154
C155
C156
C251
5
4
3
2
1
67
C302
C303
C313
C314
C153
L3
L4
R163
R181
R185
TH1
W4
W5
W6
W13
W9
W8
W1
W40
W42
W405
W32
W35
W34
W33
W16
W10
W12
W11
W36
W39
W44
W41
W17
W18
W19
W20
W21
W22
W15
W2
R309
C304
W14
GS
D G
S
D G
W998
W3
3
1
24
W7
W997
6
R301
R302
R307 R308
C191
13
C192
C401
R157
R159
R161
R191
R192
R193
R194
R195
R303
R304
R305
R306
W502
W501
B
EB
E
B
E
BE
E
BE
B
B
E
B
E
SWITCH UNIT
X16-2390-10
(J74-1534-02)
J1
S1
D1
D2
S
D
G
S
D
G
Refer to the schematic diagram for the values
of resistors and capacitors.
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
KAC-8101D/8151D
6
A
B
C
D
E
1
2
3
4
5
6
7
X09-5480-1x (1/2)
D3
D1
D2
Q53
D4
Q1
Q37
Q38
Q39
Q40
Q51
Q52
Q48
S3
Q49
D45
D46
Q50
S1
Q47
Q28
D73
D74
D75
D76
D71
D72
Q41
Q43
Q45
Q46
Q44
Q42
SPEAKER
INPUT
J3
R
R
L
L
J1
INPUT
OUTPUT
ISO AMP
IC1(1/2)
IC1(2/2)
IC2(1/2)
BASS BOOST
(2/2)
IC4
IC4(1/2)
E.X.P
D58
D59
D20
D19
D16
D17
D15
D14
(1/2)
IC7
IC7(2/2)
D9
D12
D11
D8
D10
D7
D6
D5
IC10
(1/4)
(2/4)
(3/4)
(4/4)
IC11
IC10
IC10
IC10
IC11
IC11
IC11
(4/4)
(2/4)
(1/4)
(3/4)
D30
D60
D43
D44
D48
D47
D53
D50
D52
D49
D51
D13
SUMMING
AMP
DEAD TIME
GEN CIRCUIT
LEVEL SW
DC/DC
R302
1.5K
R303
W404
W405
W403
0.01
C10
180P
C9
10u35
C3
1000P
C1
10K
R3
10K
R4
1000P
C2
1K
R2
10u35
C4
27K
R6
33P
C23
R23 33K
C24 47P
10K
R22
10P
C25
10K
R25
33P
C26
10u35
C28
430
R29
24K
R31
0.22
C33
220K
R34
300
R32
2.2u50
C34
220K
R33
680
R48
330
R47
2.2u50
C63
10u35
C65
10u35
C69
C71 100P
R68 4.7K
0.01
C61
0.01
C62
10u35
C72
47K
R69
0.01
C31
0.01
C22
0.01
C21
10K
R27
10K
R28
R26 10K
C27 10P
100K
R62
10u35
C60
R64
22K
0.01
C68
0.01
C64
0.01
C66
2.2K
R8
2.2K
R7
10u35
C6
47K
R10
47K
R12
10u35
C8
10u35
C7
47K
R11
10u35
C5
56K
R72
3K
R107
0.01
C104
10K
R108
820
R104
0.01
C101
0.01
C102
2.2K
R199
6800P
C195
510
R132
47u25
C131
47u25
C320
47u25
C317
3300u63
C313
1/2W
22
R311
4.7K
R307
4.7K
R308
10
R306
75
R304
10
R305
1.5K
R301
2.2K
R272
0.01
C271
6800P
C304
1/2W
10
R309
3900u16
C302
3900u16
C303
1000P
C309
1000P
C311
1000P
C312
1/2W
22
R312
1000P
C310
3300u63
C314
47u25
C318
24K
R124
1.5K
R121
3900P
C115
68K
R123
1u50
C111
10K
R114
8.2K
R115
150K
R111
100K
R112
0.1
C112
47u25
C113
C114
100K
R205
10
9
8
7
6
5
34
2
1
3
2
8
4
15
6
7
2
3
1
8
4
10K(A)
VR1
+12dB
7
8
4
5
6
2
3
1
16
15
14
13
12
11
10
9
RECAP2
REIN2
A
C
IN2
VCC
INVIN2
RESR32
OUT2
TTRIM2
1
2
3
4
5
6
7
8
RECAP1
REIN1
A
C
IN1
GND
INVIN1
RESR31
OUT1
TTRIM1
0.01
C37
0.01
C38
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
1
2
14
7
3
5
4
6
12
13
11
5
4
8
9
10
1
2
3
13
12
11
9
10
8
3
2
8
1
6
5
7
1K
R118
14
13
12
11
10
9
8
NC14
NC13
AOUT
V+
BIN-
BIN+
BGND
1
2
3
4
5
6
7
NC1
NC2
AGND
AIN+
AIN-
V-
BOUT
L2
8
7
6
5
4
3
2
1
9
10
11
12
13
14
1
2
3
7
8
4
5
6
2
1
3
5
6
4
4.7K
R66
4.7K
R67
10u35
C105
10u35
C106
R106 10K
1800P
C103
1.5K
R103
4
680K
R119
14
7
39P
C132
39P
C133
2.2K
R201
27K
R200
1
8
BIN-
BOUT
BIN+
C194
0.01
6
5
7
AIN+
3
4
GND
AIN-
2
C193
47u25
10K
R202
R196
4.7K
V+
AOUT
39K
R198
R197
4.7K
75
47u25
C316
24K
R318
10
R322
15K
R323
10
R316
R314
56K
R313
56K
47u25
C315
24K
R317
820
R319
10K
R321
4.7K
R320
5.6K
R324
47u35
C319
2200P
C321
1/2W
10
R326
R325
56K
R21
15K
3
4
8
6
5
7
1.2K
R46
82K
R116
4.7K
R105
4.7K
R120
10K
R63
0.01
C67
100K
R203
10K
R271
0.01
C32
47K
R9
4.7K
R65
33K
R113
1K
R117
470
R122
10K
R133
1K
R135
1K
R136
10
R315
150
R101
750
R131
1.2K
R45
4
1
5
2
3
6
12
3
3
42
1
1
2
3
90Hz OFF
9
1
6
1K
R1
27K
R5
1K
R13
10K
R24
56K
R71
150
R102
9
R134
10K
47P
+
+
+
+
++
++
+
+
+
+
+
+
++
+
+
+
+
+
+
+
+
+
+
+
+
+
+
IC6
IC12
IC9
IC8
(X09-5480-1x) (A/2)
22K
22K
16.0V
16.0V
8.0V
-7.9V
-10.2V
10.2V
16.0V
16.0V
-16.0V
51.8V
-51.8V
65.7V
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
2SA1286-T11
2SA1534A
2SA733(A)
2SA992
2SC1845
2SC2631
2SC3940A
2SC945(A)
B
C
E