Kenwood KAC-6404, KAC-7404, KACM-645, KACM-845 Service manual
POWER AMPLIFIER
KAC-6404/7404
KAC-M645/M845
SERVICE MANUAL
KAC-6404/M645KAC-7404/M845
FUSE [25A]
SPEAKER
B ch FILTER
A ch FILTER
OFF LPF
OFF LPF
[MIN] [MAX]
[MIN] [MAX]
A ch
B ch B ch
LPF FREQUENCY[Hz]INPUT SENSITIVITY[V]
KAC-7404(E type)
LINE IN
LEVEL INPUT
FUSE [40A] P.CON
BATT.
KAC-7404/M845:Fuse (40A):(F52-0016- 05)
KAC-6404/M645:Fuse (25A):(F52-0014-05)
POWER IN
© 2007-12 PRINTED IN JA PAN
B53-0606-00 (N) 519
SPEAKER OUTPUT
BRIDGED
LEFT RIGHT
KAC-6404(K type)
MAXIMUM
POWER
KAC-M645(M type)
MAXIMUM
POWER
4/3/2 Channel
Power Amplifier
4/3/2 Channel
Power Amplifier
Power Amplifier
4/3/2 Channel
KAC-6404(E type)
MAXIMUM
POWER
KAC-M845(M type)
4/3/2 Channel
Power Amplifier
4/3/2 Channel
Power Amplifier
Connecting cord assy
(E30-6144-05)
19cm
Screw & wrench key set
(N99-1587-15)
Accessories
(W01-1606-05)
MAXIMUM
POWER
MAXIMUM
POWER
This product complies with the
This product uses Lead Free solder.
RoHS directive for the European market.
2
KAC-6404/7404/M645/M845
AL
AR
BL
BR
L+
L-
RR+
L+
L-
RR+
IC1,2
ISOAMP
IC1,2
ISOAMP
SENS.
VOL
IC3,4
ISO-
AMP
IC3,4
ISOAMP
Q610
OVERLOAD
Q3,4 D4,5 IC13
±15V
AVR
SENS.
VOL
Q611-614
DC-OFFSET
DET
±B
IC9
IC9
IC8
IC8
DET
IC7
H.P.F
(80Hz/-12dB)
IC7
H.P.F
(80Hz/-12dB)
IC5
Q604 ,605
(50
TH3,IC10
THERMAL
Q1,2,5-12
DC/DC
CON
POWER
ON/OFF
L.P.F
~
DET
200Hz
-12dB)
ON /OFF.
L.P.F
ON /OFF
LC FILTER
Q607
H.P.F
FAN
AVR
FAN
Q127,131
Q128 ,132
Q227 ,231
Q228 ,232
KAC-7404
only
Q101
MUTEATT
Q102
MUTEATT
Q201
MUTEATT
Q202
MUTEATT
Q103-125
POWER AMP
Q104-126
POWER AMP
Q203-225
POWER AMP
Q204-226
POWER AMP
P-CON
BATT.
GND
AL
AR
(INV)
BL
BR
(INV)
SP
SP
OU TPU T
BLOCK DIAGRAM
OU TPU T
KAC-6404/7404/M645/M845
COMPONENTS DESCRIPTION
AUDIO UNIT (X09-8722-70/2-71)
●
Ref. No. Application / Function
IC1-4 Isolation circuit
IC5 LPF Phase inversion
IC7 HPF
IC8,9 Buffer amplifi er
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 fi rst stage amplifi er
Q107-110,207-210 Differential second stage amplifi er
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 amplifi er driver
Q123-126,223-226 Power amplifi er fi nal
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
3
A B C D E
Q219
D616
1
2
7
4
R667
2
B
B
T
KAC-6404/7404/M645/M845
1
PC BOARD (FOIL SIDE VIEW)
AUDIO UNIT X09-8722-70/2-71 (J76-0469-01)
W190
W185
W188
TP45
W189
TP47
TP50
Q607
D1
D33
R616
W184
R458
C424C224
R258
FAN
TP399
R625
EB
R624
TP400
L1
L4
L3
W183
W193
C611
P1
C423
C223
D607
TP56
R457
D609
R12
R10
R3
SDG SDG SDG SDG
Q5 Q6
C25
R613
R615
D606
BE
Q606
W591
W592
R614
R610
BE
E
D603
Q605
D605
R609
R25
W181
W182
W180
D615
CN1
12
C604
C26
R607
R606
B
Q602
B
E
W168
W169
W170
W171
R608
W178
W179
Q118
C10
C11
C603
W167
R603
D604
R242
W166
W176
W177
C612
R619
R238
R252
C222
Q1
W165
W174
W162
W104
W172
TP62
Q604
R611
BE
R612
W590
D601
D608
D602
R602
C601
W589
W588
R660
C602
W163
W161
W173
W175
W157
W164
D110
Q126
BE BE BE
EB
R248
Q122
R604
R601
W160
W159
Q2
BE
Q601
R605
W186
BE
W156
R256
TP40
R626
R7
Q603
R631
W158
W151
W152
R9
TP61
W153
W155
C8
R627
W154
B
R4
C12
R250
R11
W198
W149
L2
L5
D4
R13
W141
W142
TH3
W132
W133
W144
W143
D5
TP41
EB
Q223
W129
W140
W586
W137
W134
TP401
W130
W585
R17
W127
BE
TP358
BE
Q10
W584
Q9
W583
R453
W581
Q7
R14
BE
D6
R16
Q11
R15
BE
BE
Q8
BE
R24
Q12
W579
D8
W580
C15
W577
C28
C9
R8
W582
W201
W202
Q218
EB
C29
R452
D210
R438
TP43
Q222
EB
W125
W126
R448
W139
W136
W200
TP359
W147
W145
W146
W203
W197
W148
W150
W587
E
Q116
W596
R240
R272
C220
R232
C218
R230
R234
AR
BE
Q114
D108
R236
R246
R244
Q120
EB
Q124
W196
TP365
W138
W135
W199
R254
W131
TP39
W128
R442
C422
C419
D9
C6
R23
W575
W124
R449
Q215
R439
W123
1
R25
R18
D7
C7
TP379
R671
BE
W576
C14
Q226
R22
IC13
W122
D211
R445
W111
D207
R21
W118
W112
W113
TP42
W116
W117
R20
W114
R668
W121
R429
TP356
C16
W573
W574
W600
Q618
BE
D610
BL
W57
C617
R435
R4
916
8
W57
R2
TP394
R670
W120
R433
BE
R28
R
R
Q
W119
TP55
2
TP54
C1
TP368
3
TP53
W191
W187
TP49
4
TP46
TP48
TP51
1
TP52
J9
5
Refer to the schematic
diagram for the values
6
of resistors and capacitors.
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
7
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
4
JIHGF
KAC-6404/7404/M645/M845
1
BE
Q213
C417
W578
R431
R435
R433
R429
R443
R471
R445
449
D207
Q219
BE
BE
439
W116
W117
TP356
W576
R22
R28
C14
C16
C18
9
IC13
8
C17
W571
R21
R20
R27
25
R26
18
R19
75
W573
7
W572
W574
W600
W118
W114
W103
W105
W106
W107
TP396
R618
R667
TP395
TP394
Q618
Q617
R665
R668
BEBE
379
71
R670
C617
R669
D616
W120
W122
D211
Q226
W115
W121
W119
W111
D610
W112
W113
TP42
EBE
EB EB EB
Q225
TP366
R455
TP44
W100
TP38
W98
C27
D11
W568
R39
W599
C19
R30
R38
R36
R32
R37
W562
8
5
C20
IC10
W569
4
1
R633
C607
Q615
R663
C418
R34
R33
R31
R35
C225
TP397
BE
Q614
BE
W109
W108
R432
C608
D614
R661
TP391
W567
R472
Q214
C21
R637
TP398
W565
D205
R444
W595
R434
BE
D10
R622
R636
C609
BE
TP380
C610
Q616
W563
R430
BR
W564
Q220
W102
R261
D613
R620
Q611
R635
W561
Q613
W559
R664
R662
TP393
BE
D105
C420
R440
Q216
EB
R446
W560
R29
C22
W101
R632
TP381
BE
BE
R621
R623
Q112
EB
Q108
W99
BE
Q612
C606
W557
R224
R226
EB
D102
BE
D208
W558
R436
W570
C13
R634
TP392
R666
W110
R456
W91
W92
W90
W86
W87
Q610
R629
R617
EB
Q110
R220
R450
C616
R208
D104
R659
R447
W97
W88
W84
W556
Q104
R222
W555
W89
W83
C202
R454
W81
C212
C206
TP371
W94
W95
W96
TP372
W551
Q221
R437
BE
D209
W93
W85
R1
Q211
W554
R202
R260
BE
W597
R214
C214
C230
C228
C421
W552
W549
R425
W78
W79
W76
W77
R218
C204
R206
C260
W553
TP367
R451
R2
Q128
W82
W550
R210
C410
R441
Q207
W63
TP370
W546
BEBE
R270
BE
Q106
R212
W598
W548
R228
C216
C210
Q224
D201
R423
R401
R459
W547
Q217
BE
W80
R419
BE
D203
Q203
R417
Q227
Q132
Q102
R204
R266
C208
R216
W75
W74
BE
BE
W72
R268
W73
W69
Q209
R421
W71
BE
D106
Q123
W194
C425
C427
BE
C413
R413
W542
C405
C411
W68
TP362
R469
BE
Q231
W543
W544
W541
W540
W545
R468
R470
BE
Q202
TP377
W67
W70
R253
TP37
W60
W65
W66
TP374
R409
W538
C459
BE
TP373
R405
C403
C401
W537
C37
W539
W64
W61
BE BE
R466
Q206
C408
R412
R416
W536
R428
C416
C409
W535
R415
R411
Q232
R418
W533
C415
R427
BE
R403
R467
Q228
C404
R406
R404
BE
C406
R410
TP376
C426
W62
W41
R245
R243
BE
Q119
W195
W54
C407
TP375
Q205
R407
C460
W58
Q201
R465
W532
W534
C428
C4
D2
C215
R227
D206
W528
R215
R211
C207
TP59
W566
W529
Q105
E
Q101
BE
B
R203
R265
W52
W56
W2
C30
R267
W59
BE
R259
W57
Q127
W53
W531
R460
W50
R402
C402
TP378
R408
BE
Q204
W49
W55
R424
C412
R422
R426
D204
Q212
BE
R414
W530
D202
C414
BE
EB
Q210
Q208
R420
W204
W51
C2
W43
Q3
R5
BE BE
ALBL
R229
W594
R207
R205
C203
C201
BE
W48
C209
W46
D3
R271
R235
TP369
R269
Q131
C217
R233
C227
R209
TP58
TP57
BE
R231
D107
W45
C229
C213
W527
C205
BE
W47
R201
R217
W526
C5
R213
C259
Q113
Q109
C211
W524
R6
W42
BE
TP360
W44
R239
Q115
W523
W525
R221
W36
W34
W38
W192
W39
R249
C219
BE
BE
D101
BE
Q103
W35
W31
C328
W28
Q4
R219
Q107
D103
W40
TP77
W32
W522
R358
W521
W26
W25
W30
Q125
R255
W520
Q111
W24
TP73
C327
C23
W29
C3
TP60
R225
R223
W37
TP69
TP364
W23
BE
W33
W20
W21
W27
W22
C353
R357
85
IC8
14
R182
W519
W18
C31
C112
W19
R327
R379
R380
R307
R309
TP87
C111
R117
C109
85
14
C110
R118
R328
R336
C44
R166
C156
R312
R316
C34
TP78
C305
TP76
85
IC3
14
R310
C306
TP67
C107
TP66
IC2
R112
TP74
C108
R335
W518
W17
C24
R165
85
IC7
14
C154
R247
W15
C317
W517
W511
R311
W16
R113
R111
W14
D109
W515
R314
C308
C318
C307
R313
W516
TP85
R308
C117
C32
R114
W13
R168
W8
R315
R305
C155
C153
C43
W514
C152
W10
W11
Q121
R237
4
R306
TP65
R115
C118
W9
IC4
C355
W512
W513
R167
TP242
R241
BE
C310
R318
1
85
R317
C309
W510
R100
D37
R110
R116
R108
TP72
C42
TP246
R181
C35
TP251
C160
C221
Q117
R251
CN2
C312
C314
C33
TP81
C311
C100
D36
W509
C304
TP64
R107
R105
R109
C105
85
W12
IC1
14
C106
R367
R361
85
C356
14
R374
C352
C151
85
IC9
14
R154
C150
R180
W7
BE
R320
R319
C303
R304
TP63
TP71
R360
C351
IC5
TP255
R152
W6
FAN
12
C116
TP86
TP82
TP80
C315
W508
C113
R303
C103
R103
C104
W507
R106
C41
R362
W3
C159
TP253
R151
R153
C36
W5
D111
C605
TP79
D34
W4
R179
D35
R104
R359
2
C114
R126
TP31
R124
TP32
R122
R324
1
VR3
W593
R301
R302
R101
R102
TP121
W1
W505
R322
R321
R121
R373
W504
W503
TP25
W502
TP29
TP30
TP122
R356
R355
W501
R156
R155
2
J2
9
10
1
TP120
3
J1
TP23
C128
D32
4
LPF
FREQ
S1S2
5
BchAch
W500
OFF HPF OFF LPF
GAIN GAIN
6
R326
C316
R325
C313
R323
R123
R125
C115
C301C302
TP24
C101
C102
W506
VR2
VR1
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
7
5
A B C D E
5
5
N
N
8
7
5
2
K
0
5
0
5
0
5
0
5
KAC-6404/7404/M645/M845
1
IC1-5,7-10
IC13
TL494IDR
:
BA4560RF
:
2
D1,33
D2,3
D4
D5
D6,34,36,105,111,205,211
D7-11,101-104,107-110,
201-204,207-210,601-603,
605,608,613,615,616
D32
D35,37,106,206
D604,614
D606
D607
D609
D610
1N5406-TSC
:
UDZS16B
:
FCH10A20
:
FRH10A20
:
LM1MA142WK-G:
1SS355
:
: UMZ6.8N
LM1MA142WA-G
:
:
UDZS10B
:
UDZS15B
UDZS6.8B
:
UDZS12B
:
B30-1743-05
:
Q1,2,5,6
Q3
Q4
Q7,8,602
Q9,10
Q11,12
Q101,102,115,116,127,128,
Q103-106,203-206,601,
Q107-110,207-210
Q111,112,117,118,211,212,
STP60NF06FP:
2SD2012-F
:
2SB1375-F
:
2SC4097
:
2SA1577
:
: DTA114EUA
131,132,201,202,215,216,
227,228,231,232,605,606,
610-613,616,618
2SC4081
:
603,614,615,617
2SA1576A(R,S):
2SC1845-A(F,E)
:
2SA992-A(F,E)
:
217,218
(X09-8722-7x)
+15V
IC1
TP63
R105
D34
4.7K
R103
R104
10K
10K
D32
3
J1
A
LINE IN
B
0.01
C128
7
6
5
4
3
2
1
C103
TP23TP120
10u50
C101
1000P
R101
+
1K
TP24
C102
1000P
C104
TP25
10u50
R102
TP64
+
1K
R106
4.7K
D35
LR
2
4
8
10
4
J2
SP INPUT
TP29
10
9
937
TP30
7
TP31
43658
TP32
2
1
TP121
TP122
1K
R302
C302
1000P
+
1
C304
10u50
R304
10K
C301
1000P
R303
10K
C303
R301
10u50
1K
+
5
R305
D36
4.7K
TP78
6
(X09-8722-7X)
MODEL
KAC-7404
KAC-M845
KAC-6404
KAC-M645
UNIT
No.NAME
2-70
2-71
YES
C6,7,
C25,26,
A
10,11
28,29
YES
YES
D33
YES
D37
L1-3
YES
R306
4.7K
L4,5
YES
(2/2)
8
5
6
15P
C105
R109 12K
ISO
10K
R107
10K
R108
R110 12K
2
15P
C106
3
4
IC1
TP71
(1/2)
R123
10
C305
Q5,
6
YES
8
4
2
1
3
7
9
TP76
TP85
100K
R125
2.2K
R121
100K
R126
100K
R124
2.2K
R122
100K
R324
100K
R326
2.2K
R322
100K
R325
100K
R323
2.2K
R321
100K
IC3
(2/2)
8
5
6
4
15P
R309 12K
ISO
10K
R307
10K
R308
R310 12K
2
15P
C306
3
4
IC3
(1/2)
Q123,124,
223,224
2SC4468NF
2SC4467NF 2SA1694NF
TP65
7
1
TP72
15V
+15V
TP77
7
1
TP87
15V
Q125,126,
225,226
2SA1695NF
R111
10K
R113
10K
R114
10K
R112
10K
C113
10u50
+
C115
10u50
+
C116
10u50
+
C114
10u50
+
C314
10u50
+
C316
10u50
+
C315
10u50
+
C313
10u50
+
R311
10K
R313
10K
R314
10K
R312
10K
C117
C118
C317
C318
R12,
R5,6
13
YES
3.3K
2.7K 5.6K
7
Q113,114,213,214
Q119,120,219,220
Q121,122,221,222
Q123,124,223,224
Q125,126,225,226
Q604
Q607
TP66
10K
100P
R115
C107
TP67
TP74
C108
10K
100P
R116
TP73
C100
1000P
TP79
10K
100P
R315
C307
TP80
TP82
C308
10K
100P
R316
TP86
R215,216, R221,222
R23
1.2K
10K
15P
15P
R100
15P
15P
IC2
(2/2)
568
R117 10K
C109 100P
C110 100P
R118 10K
2
3
IC2
(1/2)
1K
IC4
(2/2)
6
R317 10K
C309 100P
C310 100P
R318 10K
2
3
IC4
(1/2)
421,422415,416
6.8K
4.7K
2SC4081(S)
:
2SC1627A-F
:
2SA817A-F
:
:
∗
:
∗
2SB1241
:
2SD1863
:
C111
47u25
7
+
TP69
C112
47u25
1
+
4
C311
85
47u25
7
+
4
TP81
C312
47u25
1
+
R249-252,
449-452
1.5K
620
SIGNAL LINE
GND LINE
B LINE
B LINE
C31
0.01
0.01
C32
+15V
47K
R319
47K
R320
C34 0.01 C33 0.01
R666,
R608,
619
668
22K
5.6K
15K
4.7K1.5K
15V
10
R7
1/2W
C8
1500P
C9
1500P
10
R8
1/2W
Ach INPUT SE
VR1 10K
Bch INPUT SE
VR2 10K
R15
1
-1
R1
10
R1
43
R1
43
10
R3
10
R3
43
R3
43
R3
10
X09-8722-70/2-71 (1/4)
6
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