Kenwood KAC-6404 User manual

This product uses Lead Free solder.
This product complies with the RoHS directive for the European market.
© 2007-12 PRINTED IN JAPAN
B53-0606-00 (N)519
SERVICE MANUAL
KAC-6404/7404
KAC-M645/M845
POWER AMPLIFIER
Accessories
(W01-1606-05)
Screw & wrench key set
(N99-1587-15)
Connecting cord assy
(E30-6144-05)
19cm
FUSE [40A] P.CON
POWER IN
BRIDGED
SPEAKER OUTPUT
LEFT RIGHT
BATT.
LINE IN
LPF FREQUENCY[Hz]INPUT SENSITIVITY[V]
[MIN] [MAX]
OFF LPF
B ch FILTER
SPEAKER
LEVEL INPUT
OFF LPF
A ch FILTER
A ch
[MIN] [MAX]
B ch B ch
4/3/2 Channel
MAXIMUM
Power Amplifi er
POWER
4/3/2 Channel
MAXIMUM
Power Amplifier
POWER
4/3/2 Channel
Power Amplifi er
MAXIMUM
POWER
4/3/2 Channel
MAXIMUM
Power Amplifier
POWER
4/3/2 Channel
MAXIMUM
Power Amplifier
POWER
FUSE [25A]
KAC-7404(E type)
KAC-6404(K type)
KAC-M645(M type)
KAC-6404(E type)
KAC-M845(M type)
KAC-6404/M645KAC-7404/M845
KAC-7404/M845:Fuse (40A):(F52-0016-05)
KAC-6404/M645:Fuse (25A):(F52-0014-05)

2
KAC-6404/7404/M645/M845
BLOCK DIAGRAM
H.P.F
(80Hz/-12dB)
L.P.F
(50
~ 200Hz
-12dB)
H.P.F
ON /OFF.
ISO-
ISO-
AMP
AL
AR
ISO-
ISO-
BL
BR
L+
L-
R-
R+
L+
L-
R-
R+
SENS.
VOL
SENS.
VOL
H.P.F
(80Hz/-12dB)
SP
OU TPU T
AL
MUTEATT
POWER AMP
(INV)
MUTEATT
POWER AMP
AR
SP
OU TPU T
MUTEATT
POWER AMP
BL
(INV)
MUTEATT
POWER AMP
BR
BATT.
GND
P-CON
THERMAL
DET
DC-OFFSET
DET
POWER
ON/OFF
DC/DC
CON
FAN
AVR
FAN
LC FILTER
±15V
AVR
OVERLOAD
±B
AMP
AMP
AMP
L.P.F
ON /OFF
DET
IC1,2
IC1,2
IC3,4
IC3,4
IC9
IC9
IC8
IC8
IC7
IC7
IC5
Q127,131
Q128 ,132
Q227 ,231
Q228 ,232
Q101
Q102
Q201
Q202
Q103-125
Q104-126
Q203-225
Q204-226
TH3,IC10
Q611-614
Q610
Q3,4 D4,5 IC13 Q1,2,5-12
Q604 ,605
Q607 KAC-7404
only

3
KAC-6404/7404/M645/M845
●AUDIO UNIT (X09-8722-70/2-71)
Ref. No. Application / Function
IC1-4 Isolation circuit
IC5 LPF Phase inversion
IC7 HPF
IC8,9 Buffer amplifier
IC10 Temperature detection comparator
IC13 DC/DC converter
Q1,2,5,6 DC/DC converter power driver
Q3,4 Constant voltage circuit (±15V) power driver
Q7-10 DC/DC converter gate driver
Q11,12 DC/DC converter control
Q101,102,201,202 Signal mute
Q103-106,203-206 Differential first stage amplifier
Q107-110,207-210 Differential second stage amplifier
Q111,112,211,212 Differential second stage current mirror
Q113,114,213,214 Idling temperature detection
Q115-118,215-218 Current limiter
Q119-122,219-222 Power amplifier driver
Q123-126,223-226 Power amplifier final
Q127,128,131,132,227,228,231,232 Protector ATT
Q601 Shock noise prevention circuit control
Q602,603 Mute circuit control
Q604-606 P-Con control
Q607 FAN power supply drive
Q610 Over current detection
Q611-614 DC protector control
Q615-618 Shock noise prevention circuit control
COMPONENTS DESCRIPTION

4
KAC-6404/7404/M645/M845
ABCDE
1
2
3
4
5
6
7
AUDIO UNIT X09-8722-70/2-71 (J76-0469-01)
IC13
Q120
Q219
Q122
Q222
Q604
Q607
P1
Q118
Q218
D4
Q124
Q223
D5
Q126 Q226
CN1
J9
Q1 Q2
Q5 Q6
D33
D1
Q7
Q8
D8
D604
D609
D610
D616
Q9
Q10
Q602
Q605
Q606
D6
D7
D9
D108
D110
D207
D210
D211
D601
D602
D603
D605 D606
D607
D608
Q11
Q12
Q116
Q215
Q601
Q603
Q
Q618
D615
Q114
1
FAN
12
W166
W167
W151
C1
C601
C602
C603
C604
C611
C612
C16
R254
R256
R453
R616
W152
W165
W153
W174
W162
W141
W142
W144
W143
W189
W140
W137
W158
W134
W130
W136
W139
W135
W132
W133
W160
W183
W116
W117
W129
W127
W114
W125
W172
W176
W124
W149
W161
W163
W131
W123
W179
W155
W177
W154
W178
W147
W150
W111
W128
W156
W138
W118
W185
W184
W173
W119
W181
W182
W164
W188
W190
W191
W121
W180
W175
W120
W159
W148
W146
W113
W126
W122
W112
W145
C28
L4
W157
C6
C7
W199
W193
W200
W197
W196
L5
W169
W104
W201
W202
W203
W168
W171
W170
W198
W186
W187
BL
AR
C29
C10
C11
L2
L1
L3
C25
C26
BE
EB
EB
EB E
EB
B
EB
8
916
1
R608
R609
R619
R668
R602
R625
C15
C617
R10 R11
R16
R17
R
1
R
2
R2
7
R606
R613
R614
R670
TH3
C14
C218
C220
C222
C419
C422
R3 R4
R12
SDG SDG SDG SDG
R13
R14
R15
R18
R20
R21
R22
R24
R25
R28
R230
R232
R234
R236
R238
R240
R242
R244
R246
R248
R250
R252
R429
R433
R435
R438
R439
R442
R4
4
R445
R448
R449
R452
R601
R603
R604 R605
R607
R610
R611
R612
R615
R624
R626
R631
R660
R667
R671
W592
W591
W585
W584
W581
W580
W583
W579
W576
W577
W57
2
W57
W575
W573
W590
W589
W588
W574
W586
W587
W582
W596
C424C224
R458
C223
R258
R272
W600
R627
R23
C423
C9
C8
C12
R9
R8
R7
R457
R25
B
BE
BE
B
BE BE BE
E
BE
BE
BE
BE B
BE
E
BE BE
BE
BE
BE
BE
BE
EB
B
TP358
TP359
TP62
TP46
TP48
TP50
TP52
TP368
TP39
TP40
TP41
TP42
TP43
TP45
TP47
TP49
TP51
TP53
TP54
TP55
TP56
TP61
TP356
TP365
TP379
TP394
T
TP399
TP400
TP401
PC BOARD (FOIL SIDE VIEW)
Refer to the schematic
diagram for the values
of resistors and capaci-
tors.
X09-8722-70/2-71
Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address
IC1 4I IC8 5H Q3 6H Q9 2E Q103 3H Q109 3H Q115 2H Q121 2I Q127 4H
IC2 4H IC9 5I Q4 6H Q10 3E Q104 4G Q110 5F Q116 5D Q122 6C Q128 4G
IC3 4H IC10 3F Q5 2C Q11 3E Q105 3H Q111 3H Q117 2I Q123 2G Q131 4H
IC4 3I IC13 3E Q6 2D Q12 3E Q106 4G Q112 5F Q118 6C Q124 5D Q132 4G
IC5 5I Q1 2C Q7 2E Q101 3G Q107 3H Q113 2H Q119 2G Q125 2H Q201 3G
IC7 5H Q2 2C Q8 3E Q102 4G Q108 5F Q114 6D Q120 5D Q126 5C Q202 4G

5
KAC-6404/7404/M645/M845
JIHGF
1
2
3
4
5
6
7
IC1
IC2
IC3
IC4
IC5
IC7
IC8
IC9
IC10
IC13
Q119
Q219
Q220
Q121
Q221
S1S2
Q107
Q108
Q109
Q110
Q111
Q112
Q117
Q207
Q208
Q209
Q210
Q211
Q212
Q217
Q3
Q123
Q224
Q4
Q125
Q225
Q226
CN2
J1
J2
D34
D36
D35
D37
Q610
D2
D3
D610
D614
D616
Q101
Q102
Q127
Q128
Q131
Q132
Q201
Q202
Q227
Q228
Q231
Q232
Q611
Q612
Q613
D32
D
7
D10
D11
D101
D102
D103
D104
D105
D106
D107
D109
D111
D201
D202
D203
D204
D205
D206
D207
D208
D209
D211
D613
Q103
Q104
Q105
Q106
Q115
Q203
Q204
Q205
Q206
Q216
Q614
Q615 Q616
Q617
Q618
Q213
Q113
Q214
1 2
9
10
1
BchAch
GAIN GAIN
LPF
FREQ
OFF HPF OFF LPF
FAN
12
C2
C3
C22
C27
C616
C606
C18
C4
C5
C207
C208
C407
C408
R100
C13
C16
C103
C104
C111
C112
C113
C114
C115
C116
C155
C156
C159
C160
C201
C202
C303
C304
C311
C312
C313
C314
C315
C316
C327
C328
C355
C356
C401
C402
R101
R102
R253 R255
R301
R302
R454
R455
R456
W80
W116
W117
W88
W100
W114
W89
W97
W98
W86
W90
W84
W92
W85
W87
W69
W74
W111
W99
W103
W83
W82
W41
W77
W42
W23
W102
W45
W8
W1
W10
W6
W5
W7
W9
W11
W51
W4
W29
W28
W118
W60
W3
W14
W17
W39
W38
W13
W119
W2
W30
W35
W32
W43
W12
W53
W31
W34
W192
W21
W20
W37
W36
W46
W50
W26
W22
W27
W24
W25
W57
W48
W115
W79
W76
W52
W66
W65
W108
W81
W15
W93
W58
W121
W54
W40
W68
W62
W120
W105
W18
W96
W113
W94
W106
W107
W19
W122
W110
W55
W73
W112
W63
W64
W109
W95
W61
W16
W70
W67
W33
W71
W47
W44
W78
W56
W59
W72
W75
W49
W101
W194
W195
W91
W204
C225
C608
ALBL
BR
VR1
VR2 VR3
BE BE
BE
BE
BE
BE BE
BE
BE BE
BE
BE
BE
BE
EB
EB EB
EB
EB
8
9
85
4
8
1
1
W540
W531
W539
W501
W500
C20
C23
C31
C33
C35 C42
C44
R31
R207
R208
R407
R408
R5
R223
R224
R225
R226
R423
R424
R425
R426
R668
C21
C24
C32
C34
C36
C41
C43
R659
R6
R261
R629
R666
R669
R618
C19
C117
C118
C203
C204
C317 C318
C351
C403
C404
C609
C610
C617
W597
R19
R26
R27
R35
R36
R39
R115
R116
R153
R155
R156
R167
R168
R179
R180
R181
R182
R203
R204
R205
R206
R315
R316
R319 R320
R327
R328
R335
R336
R355
R356
R367
R373
R403
R404
R405
R406
R635
R636
R661
R662
R663
R664
R670
C101
C102
C301C302
R103
R104
R107
R108
R113
R114
R303
R304
R307
R308
R313
R314
C14
C105
C106
C107
C108
C109
C110
C128
C150
C151
C152
C153
C154
C217
C219
C221
C259
C260
C305
C306
C307
C308
C309
C310
C352
C353
C417
C418
9
C420
C421
C459
C460
C607
C227
C228
C425
C426
W598
R
18
R20
R21
R22
R
25
R28
R32
R33
R34
R37
R38
R105
R106
R109
R110
R111
R112
R117
R118
R121 R122
R123
R124
R125
R126
R151
R152
R154
R165
R166
R201
R202
R209
R210
R211
R212
R213
R214
R215
R216
R217
R218
R219
R220
R221
R222
R229
R231
R233
R235
R237
R239
R241
R243
R245
R247
R249
R251
R259
R260
R265
R266
R267
R268
R269
R270
R305
R306
R309
R310
R311
R312
R317
R318
R321 R322
R323
R324
R325
R326
R357
R358
R359
R360
R361
R362
R374
R379
R380
R401
R402
R409
R410
R411
R412
R413
R414
R415
R416
R417
R418
R419
R420
R421
R422
R429
R430
R431
R432
R433
R434
R435
R436
R437
R
439
R440
R441
R443
R444
R445
R446
R447
R
449
R450
R451
R459
R460 R465
R466
R467
R468
R469
R470
R617
R620
R621
R622
R623 R632
R633
R634
R637
R665
R667
6
71
W537
W541
W523
W578
W576
W572
W571
5
75
W573
W508
W570
W562
W569
W574
W554
W568
W551
W542
W558
W507
W509
W521
W526
W504
W502
W514
W529
W517
W512
W511
W503
W560
W505
W513
W543
W506
W545
W547
W557
W533
W520
W593
W510
W516
W519
W567
W538
W535 W528
W525
W527
W561
W555
W563
W553
W530
W534
W548
W536
W549
W524
W515
W518
W522
W546
W564
C605
W552
W532
W565
W544
W556
W559
W550
R271
W594
C17
C411
R427
C209
R472
C409
W595
R227
C413
C406
C211
C410
C229
C214
C206
C205
C427
C405
C412
C212
C213
C414
C230
C428
R471
W599
W600
R228
R428
C216
C416
C215
C415
C100
C210
R2
R1
R29
R30
W566
C37
C30
14
85
5
4
85
14
85
14
85
14
85
14
BE BE
85
14
85
14
BE
BEBE
EBE
BE
BE
BE BE
BE
BE
BE
BE
BE
BE
BE
BE
BE
BE
BE
BEBE
BE BE
BE BE
BE
EB EB EB
BE
BE
BE
BE
BE
BE
BE
BE
BE
BE
TP57 TP60
TP24
TP121
TP23
TP29
TP30
TP31
TP32
TP37
TP38
TP42
TP44
TP58
TP59
TP63
TP64
TP65
TP66
TP67
TP69
TP71
TP72
TP73
TP74
TP76
TP77
TP78
TP79
TP80
TP81 TP82
TP85
TP86
TP87
TP120
TP122
TP242
TP246
TP251
TP253
TP255
TP356
TP360
TP362
TP364
TP366
TP367
TP369
TP370
TP371
TP372
TP373
TP374
TP375
TP376
TP377
TP378
P
379
TP380
TP381
TP391
TP392
TP393
TP394
TP395
TP396
TP397
TP398
TP25
Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address
Q203 3G Q209 3G Q215 2E Q221 2G Q227 4G Q603 4C Q611 4F Q617 4F
Q204 4G Q210 5G Q216 5F Q222 5E Q228 4G Q604 4C Q612 4F Q618 4F
Q205 3G Q211 3G Q217 2G Q223 2E Q231 4G Q605 4B Q613 4F
Q206 4G Q212 5H Q218 5E Q224 5G Q232 4G Q606 4B Q614 4F
Q207 3G Q213 2F Q219 2F Q225 2F Q601 4C Q607 6B Q615 5F
Q208 5H Q214 6F Q220 5F Q226 5E Q602 4C Q610 4F Q616 5F

6
KAC-6404/7404/M645/M845
X09-8722-70/2-71 (1/4)
ABCDE
1
2
3
4
5
6
7
-1
5
1
5
(X09-8722-7x)
Q107-110,207-210
217,218
Q604
Q607
Q125,126,225,226
Q111,112,117,118,211,212,
Q113,114,213,214
Q119,120,219,220
Q121,122,221,222
Q123,124,223,224
D2,3
D604,614
D606
D607
D609
D610
D32
D6,34,36,105,111,205,211
D7-11,101-104,107-110,
201-204,207-210,601-603,
605,608,613,615,616
D35,37,106,206
D1,33
D37
IC3
(1/2)
IC3
(2/2)
D36
J2
LR
D4
D5
(1/2)
IC4
IC4
(2/2)
: UMZ6.8N
UDZS10B
UDZS15B
UDZS6.8B
UDZS12B
B30-1743-05
LM1MA142WA-G
:
:
:
:
:
:
UDZS16B
FCH10A20
FRH10A20
1SS355
LM1MA142WK-G:
:
:
:
:
∗
∗
2SB1241
2SD1863
1N5406-TSC
:
:
:
:
:
2SA817A-F
2SC1627A-F
2SC4081(S)
2SC1845-A(F,E)
2SA992-A(F,E)
:
:
:
:
:
IC13
Q9,10
Q7,8,602
Q1,2,5,6
Q11,12
IC1-5,7-10
Q101,102,115,116,127,128,
131,132,201,202,215,216,
227,228,231,232,605,606,
610-613,616,618
Q103-106,203-206,601,
603,614,615,617
D32
J1
LINE IN
A
B
Q3
Q4
D35
(1/2)
IC1
IC1
(2/2)
D34
: DTA114EUA
2SC4081
2SA1576A(R,S):
:
BA4560RF
TL494IDR
2SA1577
2SD2012-F
2SB1375-F
2SC4097
STP60NF06FP:
:
:
:
:
:
:
IC2
(1/2)
IC2
(2/2)
Ach INPUT SE
N
Bch INPUT SE
N
(X09-8722-7X)
SIGNAL LINE
B LINE
B LINE
GND LINE
ISO
ISO
C302
1000P
C301
1000P
R310 12K
4
R306
4.7K
C306
15P
2
3
R304
10K
R303
10K
R308
10K
R307
10K
1
R312
10K
R316
10K
C318
100P
C308
15P
R309 12K
8
4
C305
15P
R305
4.7K 5
6
R311
10K
7
C307
15P
R315
C317
100P
10K
9
10
SP INPUT
4
3
6
5
8
7
R321
100K
2.2K
R323
R325
100K
1
2
R322
2.2K
R326
100K
100K
R324
10u50
C313
C315
10u50
C316
10u50
10u50
C314
R121
2.2K
R122
2.2K
R124
100K
R126
100K
R125
100K
R123
100K
C114
10u50
C116
10u50
C115
10u50
C113
10u50
R319
47K
C312
47u25
R318 10K
C310 100P
C34 0.01 C33 0.01
C309 100P
R320
47K
6
R317 10K
4
85 7
C311
47u25
R3
8
10
VR2 10K 10
R3
7
R1
5
R15
2
10
K
VR1 10K 10
C108
15P
R101
1K
R102
1K
2
4
1
2
3
5
6
7
C128
0.01
R100
1K
C100
1000P
C106
R106
4.7K
15P
3R112
10K
1
C107
15P
4
10u50
C104
R108
10K
C103
10u50
R107
10K
TP64
R114
10K
R116
C118
100P
10K
10K
R113
R115
C117
100P
10K
8
R105
4.7K
6
57R111
10K
R8
10
1/2W
3
21
C112
47u25
4
C32
0.01
5
6
87
0.01
C31
C111
47u25
R7
10
1/2W
C9
1500P
C8
1500P
43
0
R3
5
43
0
R3
5
43
0
R1
5
43
0
R1
5
TP73
TP74
TP67
TP66
TP69
15P
C105
C109 100P
R117 10K
R118 10K
C110 100P
R109 12K
R110 12K
TP71 TP72
TP65
TP63
TP81
TP79
TP80
TP77
TP76
TP78
TP87
TP85
TP86
TP82
3
21
10K
R314
10K
R313
TP31 TP32 TP29 TP30
TP25
TP24
TP23TP120
TP122
TP121
9
7
3
1
10u50
C304
10u50
C303
1K
R302
1K
R301
1000P
C101
1000P
C102
10K
R103
10K
R104
8
2
4
10
MODEL C6,7,
YES
D33
YES
YES
28,29
C25,26,
A
YES
KAC-6404
KAC-M645
KAC-M845
KAC-7404 2-70
2-71
UNIT
No.NAME 10,11
YES
L1-3
YES
L4,5
YES
6
Q5,
2SC4468NF
223,224
Q123,124,
2SC4467NF 2SA1694NF
2SA1695NF
225,226
Q125,126,
421,422415,416
4.7K
6.8K
R215,216, R221,222
R5,6
3.3K
2.7K 5.6K
10K
R23 449-452
620
1.5K
R249-252,
1.2K
R608,
619
5.6K
4.7K1.5K
R12,
13
YES
668
15K
22K
R666,
10
8
2
4
9
3
7
1
15V
+15V
+15V
15V
15V
+15V
+
+
+
+
+ +
+
+
+
+
+
+
+ +
+
+

7
KAC-6404/7404/M645/M845
X09-8722-70/2-71 (2/4)
JIHGF
2-71 : -24.7V
2-70 : -35.5V
2-71 : +24.7V
2-70 : +35.5V
5.0V
-15.0V
15.0V
2.5V
IC13
Q128
Q228
Q227
Q127
(2/2)
(2/2)
IC9
(2/2)
IC8
IC9
(1/2)
Q4
IC8(1/2)
(2/2)
IC5
IC5
(1/2)
S1
IC7
(1/2)
(2/2)
IC7
S2
D3 D2
Q3 D4
D5
∗Q6
Q2
Q12
Q8
IC10
IC10
(1/2)
Q1
∗Q5
Q10
Q9
D6
Q7
Q11
D7
D8
D11
Q231
Q232
Q
2
Q
2
Q132
Q131
D10
Q1
Q1
D9
INPUT SENS.
INPUT SENS.
PHASE INVERTER
HPF : 80Hz.12dB/OCT
LPF
50-200Hz
PHASE INVERTER
OFF/LPF
OFF/HPF
-3.0dB
-1.5dB
-3dB ATT
ATT -1.5dB
ATT -3.0dB
DC/DC CONVERTER
TEMPERATURE DET
C17
1000P
R402
3.3K
TP255
R380
10 2
3
C24
V
R2 10K 10
6
5
R379
R151
TP253
R152
10K
2
C150 47P
R154 10K
31
C35 0.01
C36
0.01
V
R1 10K 10
6
5
C328
10u50
C355
10u50
C327
10u50
R357
39K
R361
R358
39K
1
VR3
0.01
4.7K
R367
C41
10K
0.01
R360
10K
7
8
4
R359
68K
C353
0.047
5
C351
0.1
6
87
4
C352 47P
R374 10K
R336
47K
R335
47K
R373
47K
2
R362
10K
31
R417
13K
R401
3.3K
C44
C43
R166
0.1
15K
0.1
TP251
C152 C154
R168
27K
10u50
1
2
C160
10u50
3
R182
47K
C156
C153C151
7
R165
4
0.1
15K
0.1
R167
27K
8C155
0.01
0.01
6
57 8
4
R181
47K
10u50
C159
10u50
R180
47K
R202
3.3K
R218
13K
R179
47K
3.3K
R217
13K
R201
6
57
1/2W
47u25
10u50
C3
47u25
C5
C2
C4
10u50
∗C28
2200u35
∗C29
2200u35
∗R5
1/2W
∗L2
3300u16
3300u16
∗C11
∗C10
10
R9
1/2W
∗L5
2200u16
2200u16
∗C25
∗C26
R15
47
3300u50
∗C7
3300u50
∗C6
TH3
R4
22
∗R13
22
C19
0.1
R36
2K
R32
200
C21
0.01
C20
0.01
3
21
4
470K
8
R1
100
R33
R2
C15
0.1
10u50
C18
R11
4.7K
R10
4.7K
R3
22
∗R12
R14
22
R16
1.5K
R17
1.5K
47
R19
33K
C13
10u50
TP356 TP401
R20
330K
R21
C14
0.01
10K
R25
R26
R27
22K
4.7K
1K
R22
3.3K
C16
47u25
R467
10K
R468
10K
R466
10K
R465
10K
C30
0.01
10K
16K
R270
R260
R268
10K
C37
0.01
16K
10K
R259
R269
R267
10K
R38
5.6K
R30
100
R261
R659
18K
C616
10u50 TP
6
10
E1C1
2.2K 2.2K
R39 R35
R34
5.6K R29
100
C27
10u50
100 R266
10K
R265
10K
OUTCTRL
DTC
8
7
6
5
GND
RT
CT
4
3
2
1
FBACK
IN1-
IN1+
9
10
11
12
E2
C2
VCC
13
14
15
16
REF
IN2-
IN2+
430
R355
430
R356
R327 10KR328 10K
C42 0.01
C23 0.01
10u50
C356
430
R155
430
R156
R153 10K
R37 470K
∗R23
∗R6
TP359
TP358
R28 100K
R24 10K
R18 33K
10
9
10
9
C12 1500P
10K
R459
16K
R469
10K
R460
16K
R470
13K
R418
10u50
C22
10K
R31
C22
TP242
TP246
6 8 7
TP60
TP57
+15V
+15V
15V
15V +B
B
15V
+15V
+15V
15V
15V
+15V
15V
+15V
15V
+15V
B
+B
BU BU
SW12V
+
+
+
+
+
+
+
++
+
+
+
+
+ +
+ +
+
+
+
+
+
+
+
+

8
KAC-6404/7404/M645/M845
X09-8722-70/2-71 (3/4)
KLMNO
Q204
Q206
D204
Q220
Q214
Q212
D208
Q216
∗Q224
Q202
Q208
D202
D201
Q203
Q201
Q207
Q205
D203
Q106
D104
Q221
Q210
D206
Q218
D210
D211
Q213
Q209
D205
Q211
D209
Q217
Q215
Q222
∗Q226
∗Q225
Q219
Q120
D207
Q114
Q112
D108
Q116
∗Q223
∗Q124
Q610
Q
Q602
D610
D608
D601
D60
2
Q104
Q102
Q108
D102
Q103
Q101
D101
Q107
Q105
D103
Q122
Q121
Q110
D106
Q118
D111
D110
Q109
D105 Q117
D109
∗Q126
∗Q125
Q119
Q113
Q111
D107
Q115
∗Q123
Q
Q601
AL POWER AMP
AR POWER AMP
BL POWER AMP
BR POWER AMP
MUTE
OVER
DET
CURRENT
C422
1000P
2W
R442
1K
C418
0.01
R432
560
∗R416
R414
C402
10u50
470P
R430
1.8K
C410
R434
56
5P
C416
R428
47K
R472
82
100
R436
C420
1000P
R440
1K
2W
150
R407
15K
R410
R466
10K
R406 47K
C404 470P
R409
R420
R412
1.5K 1.5K
C406
4700P100
C412 100P
R411
1.5K 1.5K
R419
R465
10K
C403 470P
R405 47K
TP362
C401
10u50
C405
4700P
TP374
TP375
R413
100
TP373
TP61
R208
15K
R224 ∗R222
R429
1.8K
∗R452
R437
100 100
100
R438
100
C425
3P
560
R431
R427
47K
82
R471
R441
1K
R439
1K
R448
4.7
2W
470P
C409
100
R435
470P
R226
150
C210
5P
R234
56
R236
100
C220
1000P
R240
1K
R445
4.7
R254
0.1
2W
12K
R629
C606
100u10
10K
R617 TP381
R632
47K
C601
C612
10u50
33u35
R603
10
R219 150
R220
∗R221
R206 47K
C204 470P
R266
10K
R210
4700P
∗R216
R214
100
C206
R212
1.5K 1.5K
R265
10K
R209
C203 470P
R205 47K
C201
10u50
R211
1.5K 1.5K
C205
4700P
R213
100
∗R215
R223
R207
15K
∗R252
C230
100P
C216
R228
47K
C214
100P
100
C222
1000P
R242
1K
R238
100
100
C227
3P
C215
5P
R227
47K
R231
560
C217
0.01
R241
1K
R239
1K
R256
0.1
2W
R248
4.7
R631
1K
R255
0.1
2W
R253
0.1
2W
∗R249
R225
150
C209
470P
R235
100
R660
10K
R602
1.2K
R604
R626
22K
TP391
1000P
C421
1000P
C419
470
R443
2W
0.1
R455
0.1
R453
∗R451
4.7
R447
∗R449
56
R433
C417 0.01
C415 5P
∗R421 150
R423
150
R425
100P
C427
47P
C459
100P
C413
100K
R403
47u25
C407
∗R415
100K
R404
∗R422
3P
C426
15K
R408
47P
C460
150
R424
150
R426
100P
C414
100P
C428
100P
C411
470
R444
∗R450
0.1
R454
0.1
R456
TP367
TP43
TP42
TP366
TP44
TP41
TP378
TP376
TP377
TP360 TP58
TP59
TP369
TP371
TP370
TP372 TP365
TP40
TP364
TP38
TP37
1.8K
R229
82
R271
56
R233
1000P
C219
470
R243
4.7
R245
1000P
C221
100
R237
560
R232
82
R272
1.8K
R230
TP39
470
R244
100P
C229
100P
C213
100P
C211 47u25
C207
47u25
C408
47P
C259
100K
R203
3P
C228
100P C21247u25
C208
100K
R204
10u50
C202
47P
C260
C218 0.01
4.7
R246
∗R250
∗R251
4.7
R247
4.7
R446
47K
R622
47K
R623
47K
R620
47K
R621
100u50
C225
6
8
7
SW12V
+B
B
+B
B
+B
B
B
B
B
B
+B
+B
B
+B+B
BB
+B
BUBU
SW12
V
SW12VSW12V
SW12VSW12V
+
+
+
+
+
+
++
+
+
+

9
KAC-6404/7404/M645/M845
X09-8722-70/2-71 (4/4)
TSRQP
1
2
3
4
5
6
7
14.4V
KAC-6404/7404/M645/M845
D615
D609
CN2
D616
Q607
Q615
Q617
6
10
Q616
Q618
Q611 Q612
CN1
D613
Q613
Q614
Q
602
D
608
D
601
D602
D604
D614
P1
D606
Q606
Q605
D607
Q603
D603 D605
Q601
Q604
∗D33
D1
J9
POP NOISE-MUTE
P-COM
M
UTE
DC PROTEC
FAN
+11V
FAN
FAN
∗A
10u50
C604
R625
680
C611
TP399
10u50
C605
0.01
1
2
R670
R624
4.7
TP400
10K
C608
220u10
2
1
6.8K
C617
0.1
R671
47K
R635
6.2K
R636 R637
3
81
R632
47K
R618
2.2K
TP380
R634
12K
0.01
C607
R633
12K
TP396
C601
33u35
R603
10
C602
R606
10K
10u50
R607
4.7K
2.2K
C609
0.01
TP397
10K
C610
TP398
0.01
R613
1.5K
R
631
1K
30K
R627
4.7K
R604
10K
R626
22K
R609
33K
R610
R611
3.6K 3.6K
R612
R615
3.9K
0.047
R457
R458
0.047
C424
0.047
C423
R257
10 1/2W
R258
C223
0.047
C224
18uH
∗L3
18uH
∗L1
∗L4
5uH
GND10
10u50
BR+
AR+12
BL-
AR-
BR-
AL-
34
56
AL+
BL+
P CON
78
9
C1 40A/25A
FUSE
BATT11
TP392
TP393
TP394
TP395
6.8K
R665
22
R661
22
R662
10K
R663
10K
R664
∗R666
6.8K
R667
33K
R669
TP391
TP53
TP52
TP51
TP48
TP49
TP46
TP50
TP368
TP45
TP47
10 1/2W
10 1/2W
10 1/2W
TP55
TP54
TP56
R605 33K
TP62
∗R619 ∗R608
10u50
C603
3.3K
R614
3.9K
R616
R601 10K
TP379
∗R668
BU
BU
SW12V
+
+
+
+
+
+
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 be-
tween individual instruments or/and units.
2SA817A-F
2SA992-A
2SC1627A-F
2SC1845-A
B
C
E
2SA1576A
2SB1375-F
2SD2012-F
2SC4081
DTA114EUA

10
KAC-6404/7404/M645/M845
EXPLODED VIEW
Parts with the exploded numbers larger than 700 are not supplied.
3
2
1
BA
A
B
C
D
E
F
G
Y
Z
φ2.6x13
φ3x10
φ2.6x8
φ3x6
φ3x8
φ3x14
φ3x10
M6 AU
M4 AU
: N09-6365-05
: N80-3010-43
: N82-2608-43
: N89-3006-43
: N89-3008-48
: N89-3014-48
: N09-6447-05
: N07-0003-08
: N09-4214-08
(X09-872)
J1 J2
J9
VR3
VR2
VR1
F1
Bundled to the
transistor.
Ax6
Ax4
Ax2
Yx2
Fx2
Zx4
Zx5
Gx2
Ax2
Ex3
Cx2
Cx2
Fx2
Ex2
Ex2
Ex2
Ex2
E
D
D
E
E
E
E
E
E
E
B
D
D
E
A
A
708
712
E
1
16
5
4
7
15
717
702
713
709
3
10
713
Bx3
709
10
ONLY USED
KAC-7404/M845
ONLY USED
KAC-7404/M845
ONLY USED
KAC-7404/M845
ONLY USED
KAC-7404/M845
ONLY USED
KAC-7404/M845