Kenwood KAC-9405, KAC-8405, KAC-9405M Service Manual
POWER AMPLIFIER
KAC-8405
KAC-9405/9405M
SERVICE MANUAL
© 2009-12 PRINTED IN JA PAN
B53-0772-00 (N) 341
M type
Fuse (30A)
(F52-0045-05)
Screw & wrench key set
(N99-1820-05)
Dressing Panel
(A21-6752-01): (K type)
(A21-6753-01): (E type)
(A21-6782-01): (M type)
E,M type
Connecting cord assy
(E30-6144-05)
19cm
This product complies with the
This product uses Lead Free solder.
RoHS directive for the European market.
KAC-8405
KAC-9405/9405M
IC1,2
AL
AR
LINE IN
(0.2-5V)
BL
BR
L+
LRR+
L+
LR-
SPEAKER LEVEL INPUT
R+
ISO-AMP
IC1,2
ISO-AMP
IC3,4
ISO-AMP
IC3,4
ISO-AMP
ST/
MONO
ST/
MONO
Q523-526,
621-624
SENS.
SENS.
SENS.
SENS.
Q20,21
15V
AVR
VOL
VOL
VOL
VOL
BLOCK DIAGRAM
IC8
H.P.F
IC7
L.P.F
IC8
L.P.F
IC7
H.P.F
IC12
IC9,10
BASS
BOOST
40Hz
+18dB
IC9,10
BASS
BOOST
Q703 Q711,712
DETDET DET
D14,15
Q715,716 Q3
SIGNAL
DETECTOR
THERMALDC-OFFSETOVERLOAD
IC14
B
Q10,11
P-CON
PRIORITY
DC/DC
CON
POWER
ON/OFF
H.P.F
IC13
L.P.F
IC12
L.P.F
IC13
H.P.F
50-200Hz
LC FILTER
FAN
AVR
FAN
Q705
Q501,503
CLIPPER
ATT
CLIPPER
Q601,603
CLIPPER
ATT MUTE
CLIPPER
P-CON
BATT.
GND
Q502,
504 Q506
Q602,
604 Q606
Q505
MUTE
MUTEATT
Q605
MUTEATT
POWER AMP
POWER AMP
POWER AMP
POWER AMP
AL
AR
(INV)
BL
BR
(INV)
SP OUTPUT
SP OUTPUT
2
COMPONENTS DESCRIPTION
AUDIO UNIT (X09-8940-10)
●
Ref. No. Application / Function
IC1~4 Isolation circuit
IC5 Non-inverting circuit
IC6~IC8,IC11~IC13 HPF, LPF
IC9~IC10 Bass Boost circuit
IC14 DC-DC IC
IC15 ATT circuit
Q1 Voltage supply
Q2 Over voltage detection circuit
Q3 P-CON
Q4,Q7~Q9 Smoke and fi re prevention circuit
Q5,Q6 Mute driver
Q10,Q11 Switch
Q12~Q15 Gate driver
Q16~Q19 DC-DC comparator
Q20,Q21 Regulated power supply
Q501~Q504,Q601~Q604 ATT circuit
Q505,Q506,Q605,Q606 Mute
Q507~Q514,Q607~Q614 Differential circuit - 1st stage
Q515,Q516,Q597,Q598,Q615,Q616,Q697,Q698 Differential circuit - 2nd stage
Q520,Q599 Power stage regulated power supply
Q521,Q522,Q619,Q620 Temperature compensation
Q523~Q526,Q621~Q624,Q704 Over current detection circuit
Q527~Q530,Q625~Q628 Darlington
Q531~Q534,Q629~Q632 Final stage
Q701~Q703 Latch circuit
Q705 FAN driver
Q706,Q708~Q710 Clipper circuit
Q707,Q714 Current control circuit
Q711,Q712 Temperature detection circuit
Q713 Shutdown
Q715,Q716 Auto P-CON circuit
KAC-8405
KAC-9405/9405M
3
5
W413
Q5
W
3
F
Q
4
A B C D E
KAC-8405
KAC-9405/9405M
1
PC BOARD (FOIL SIDE VIEW)
X09 B/2
BE
W434
R564
D514
W134
W124
R669
Q701
Q703
W445
W443
W440
W441
W442
W140
W141
R702
R704
R708
C705
R709
W142
W143
W439
R562
C623
R714
D5
W135
R706
R12
EB
W139
W136
R705
W137
W138
W432
R568
W436
W117
W129
R670
W435
W400
W133
W428
W429
R550
W130
Q702
EB
C702
R703
W430
W431
W131
W132
VR3
AF
W125
C624
R715
Q4
W433
Q522
C524
Q524
W126
W128
R548
EB
W101
W127
R15
W421
W424
W118
W119
R13
R14
W422
C901
W123
R558
C526
W423
W418
W121
W427
W416
W419
C528
R560
W112
W120
W116
W523
W122
R18
R544
W75
W11
W417
C703
W45
W115
Q6
BE
R317R318
R546
R570
BE
D7
W415
BE
C6
R1
D6
P1
S
H/O
AUDIO UNIT X09-8940-10 A/2 (J76-0655-11)
C416
C415
R411
5
4
IC10
C406
R412
8
R414
2
3
R431
4
5
W370
R433
B.B
S2
W325
W306
C428
C427
W526
ON/OFF
S3
R415
MONO/ST
S5
L/OFF/H
R434
W511
C426
W301
2
8
W515
W12
W5
W389
W369
R416
W351
R432
W514
C420
C421
C408
CN33
W357
W17
R420
R418
R422
R423
R428
C422
W520
1
W410
7
W381
VR2
B-SENS
BF
VR4
R406
R408
R410
C404
W324
W512
584
IC11
W310
W6
584
R424
C418
R426
W304
584
IC12
R427
C405
1
W426
W377
W388
W73
R403
R404
R402
R401
584
IC9
W513
1
W425
R421
IC13
1
C417
R430
R425
W303
W4
1
C419
W302
R413
W414
W341
W7
R409
1
W323
C407
W462
C403
W313
R429
C402
R405
R417
R419
R407
C401
C425
C902
D707
D706
R752
R751
EB
W510
R753
R762
Q521
EB
C717
Q714
W1
W114
W71
W509
Q19
Q17Q18
Q16
C523
W508
Q533
W507
Q531
D14
D15
R45
GDSGDSGDSGDS
R44
R42 R43
6
R545
R563
BEB
R549
E
R547
W202
R26
EB
R543
W3
Q9
R555
W196
W197
W198
W506
W200
W505
Q523
EB
Q527
W195
W199
Q529
R565
W201
R561
R573
R569
EB
R559
BE
W192
W193
W191
C3
W194
R25
R22
R24
C527
R553
W189
C525
W503
BE
BE
W190
R571
D515
Q525
R557
D513
C14
C15
C16
R46
R41
W504
C1
BE
W185
W186
W187
W188
EB
R37
EB
R36
R40
BE
Q13
D3
BE
R6
BE
Q7
Q8
R23
W2
Q2
R537
R567
Q14
C8
C2
Q3
C517
Q15
W500
W501
W184
R8
R39
W502
Q599
BE
Q12
D2
BE
R38
W496
W497
W499
EB
R5
W498
R2
1011
D507
Q11
EB
9
W491
C718
C19
W493
W494
W495
R3
C719
Q715
D509
R738
BE
C521
C519
R49
W492
Q10
R754
D519
TH1
D13
D511
L1
W489
W490
D11
D710
BE
EB
W486
W487
C720
R538
D10
C12
EB
R756
W485
Q716
W488
Q520
C518
W483
W181
W207
Q711
Q712
16 9
1
R28
R32
R31
W484
W481
W482
8
R758
R755
W182
7
W183
R757
EB
D508
W105
W179
IC14
R35
D12
D510
C11
W480
D18
R9
R4
C90
L2
W478
W177
R577
W479
W477
C9
R27
W180
C522
W173
8
C531
D520
D512
W174
R29
R671
C625
Q532
BE
W153
BE
R554
R572
W169
C520
W175
R51
R50
C10
W475
W474
R30
R54
W176
6
5
W459
EB B
W476
W171
C20
Q1
R1
D4
C18
C17
R48
R47
W472
R33
C13
W473
J3
R34
W471
W172
R55
W467
W469
W470
W166
W465
W468
W466
W170
4
3
W167
R7
C4
W464
W161
W463
W449
C5
W168
W452
W453
W454
W457
W178
R575
W163
W451
W450
R672
C626
W160
W165
W162
R20
R21
W164
D9
W159
W154
C529
R712
W156
R11
W448
W158
2
1
W155
W446
W157
W152
W37
R576
W447
D701
Q528
W149
C530
R713
R701
C701
W150
R10
W151
W148
C532
W144
C704
R707
W147
W437
W438
R578
W444
W145
BE
BE
W146
7
4
2
Q522
Q524
W126
W128
3
BE
524
R546
R544
C528
R548
8
9
R560
0
R558
C526
W423
E
B
W418
W112
W120
W101
W75
W116
W523
W121
W427
W416
2
2
C703
3
W424
W122
0
W115
1
W118
W127
W119
R13
R18
R14
R15
BE
W422
C901
W123
W419
W421
W113
W417
W455
Q6
C6
R317R318
BE
P1
BE
R16
D6
R570
Q526
W110
D7
W104
W103
W415
C7
Q5
W109
R535
W102
W413
R711
W412
W107
R525
BE BEBEBEBEBE
Q513
W411
R718
R710
W456
D702
R17
BE
W408
W409
W111
R507
R717
Q713
R325
Q534
D505
Q509
C706
Q704
R716
W407
C321
R574
C515
Q501
R511
EB
W404
R750
W406
W106
D516
BE
W108
R513
W405
Q20
R566
C21
BE
D16
Q530
BE
R556
W402
W100
W94
W88
W395
W89
W95
D503
W81
W82
R533
Q515
Q597
EB
C513
C511 C512
W84
R523 R524
Q507
R527
R529
Q514
Q511
C507
R531
C503
R521
C509
Q503
C501
Q505
R515
R519
R517
W98
D517
W93
W522
W97
W521
W398
W399
R19
R749
41
C311
IC8
58
C314
W92
W96
R322
R316
58
W393
W99
41
W394
C313
R315
R321
W403
C322
W396
C320
R326
R328
VR1
A-SENS
W401
S4
H/OFF/L
S1
ST/MONO
R536
C516
R526
W91
C312
C315
C316
R319
R301
R302
W397
R323
R320
W392
C23
D506
Q510
Q502
R512
R508
W391
W87
D8
R602
R324
R314
W90
R312
85
14
R311
R313
R327
IC6IC7
BE
W86
BEBEBEBEBE
W85
C319
R52
W390
W83
Q504
R514
W79
R501
R502
R601
R530
BEBE
W387
W386
W379
W72
W66
W67
W68
W69
CN2
12 12
W60
W61
R534
Q516
Q598
C514
Q508
R528
BE
Q512
R532
C508
R522
C510
Q506
R518
R516
W74
R509
W76
D501
W77
W78
R503
R505
W385
R747
W382
BE
Q709
W383
W384
C118
W80
R53
Q21
D17
W372
W65
CN1
D605
D504
EB
W40
W41
R635
BE
Q615
Q697
C615 C616
W62
W63
R625
Q609
R629
Q607
R627
Q613
C607
C502
W70
D502
R504
R741
IC5
R117
R742
W376
R605
R309
R303
C114
C113
Q601
R611
R607
W374
W519
D601
R606
R603
W371
BE
Q708
W373
R746
85
14
R109
41
58
W64
R737
R736
R740
R743
R308
W367
W368
R307
C112
IC2
C111
IC1
R110
Q603
R613
D602
R604
BE
C302
W366
W458
R305
R631
C609 C610
R615
W59
Q707
EB
C715
R306
C301
C504
R520
D518
R510
R506
R745
R744
Q710
EB
W378
R310
C304
85
14
C303
W461
R120
R118
R119
C117
C108
C22
C611
W54
Q706
C305
C306
W57
W58
R115
Q605
R617
D611
R304
C110
R116
W363
C107
R111
R114
R113
R105
R107
Q611
R621
W55
W56
W356
R633
C613
R623
R619
Q705
W358
W53
W364
EB
C603
W380
C105
W361
C24
D606
D603
R636
W43
R626
Q610
BEBEBEBEBEBEBE BEBE
Q614
W362
W46
Q602
C601
R612
R608
W360
W354
R609
W47
R610
R719
D704
R720
EB
C721
R739
W517
R735
W420
R722
R734
W365
W518
W359
W48
W50
W460
W52
W44
R112
W51
W49
W45
W350
R219
C109
R104
W355
R108
C104
R106
R200
C106
C200
BE
C707
W353
R724
R103
W42
Q604
W349
R761
W352
C218
R220
C608
R614
IC15
D604
Q698
R630
R632
R616
R218
W348
C217
C102
R628
W346
D705
R728
W347
R634
Q608
R727
1
845
R217
Q606
D612
C708
C213
W204
W205
Q616
EB
C614
C612
R624
C604
R622
BEBEBEBEBEBEBE
R618
R620
W525
W524
W206
R759R760
W344
W342
C212
85
C214
IC4
14
C211
W39
C101
R102
W343
R732
Refer to the schematic diagram for the values of resistors and capacitors.
W38
W345
C709
W516
R725
R729
R731
R730
R726
Q612
C602
8
R101
7
W34
W35
CN3
W36
C103
W338
C210
R216
W339
W340
R215
C209
W33
W16
W336
W31
W32
W335
J1
W30
W28
W332
W333
W334
2
1
W29
C204
D610
R214
R212
C207
W18
W21
W24
Q627
W331
W19
R211
R213
W27
W25
W23
C622
R663
W203
W26
C208
R204
C202
Q625
R653
W330
Q622
R660
W22
C219
R665
D607
C619
W328
Q626
R656
R654
R668
R647
C621
D609
D608
W329
W321
W20
R202
D204
W14
EB
R657
BEBE
R661
R655
W318
R651
R643
W317
EB
W326
R637
W316
Q621
R641
BE
Q623
R649
BE
R659
R667
R666
W13
EB
R648
EBE
R662
W15
W327
B
C620
R652
BE
R638
R642
Q624
EB
R640
W319
R644
R664
W320
Q628
EB
R206
R208
R210
C206
85
IC3
1
4
R209
C205
R205
R207
R203
C201
R201
W322
C203
D203
W314
R639
W10
W315
R650
R155
R151
10
W8
W11
9
Q629
W9
C617
Q630
Q632
W311
Q631
R658
W312
C618
C153
C151
R153
J2
BE
Q619
EB
Q620
C253
W309
C251
C254
R255
R253
R256
R251 R252
1
2
C252
C152
R254
R154
W308
R152
C154
W307
KAC-8405
KAC-9405/9405M
X09-8940-10
Ref. No. Address Ref. No. Address
IC1 6G Q527 3C
IC2 5G Q528 2E
IC3 5H Q529 2C
IC4 5H Q530 2F
IC5 5G Q531 3C
IC6 5G Q532 2E
IC7 5F Q533 2C
IC8 4F Q534 2F
IC9 4B Q597 3F
IC10 2A Q598 3G
IC11 5B Q599 2C
IC12 5A Q601 3G
IC13 5B Q602 3G
IC14 5D Q603 3G
IC15 5H Q604 3G
Q1 4D Q605 3G
Q2 5C Q606 3H
Q3 5C Q607 3G
Q4 5E Q608 3H
Q5 5F Q609 3G
Q6 4F Q610 3G
Q7 5C Q611 3G
Q8 6C Q612 3H
Q9 6C Q613 3G
Q10 5D Q614 3G
Q11 5C Q615 3G
Q12 5C Q616 3H
Q13 5C Q619 2I
Q14 5C Q620 4I
Q15 5C Q621 2H
Q16 5C Q622 4H
Q17 4C Q623 3H
Q18 5C Q624 4H
Q19 4C Q625 2H
Q20 2F Q626 3H
Q21 2G Q627 3H
Q501 3F Q628 4H
Q502 3F Q629 2I
Q503 3F Q630 4I
Q504 3G Q631 3I
Q505 3F Q632 5I
Q506 3G Q697 3G
Q507 3F Q698 3H
D708
R156
W305
Q508 3G Q701 4E
Q509 3F Q702 4E
Q510 3F Q703 4E
D709
Q511 3F Q704 4F
Q512 3G Q705 4G
Q513 3F Q706 4G
Q514 3F Q707 4G
Q515 3F Q708 4G
Q516 3G Q709 4G
Q520 2D Q710 4G
Q521 2B Q711 4D
Q522 1E Q712 4D
Q523 2C Q713 4F
Q524 2E Q714 6C
Q525 2C Q715 6D
Q526 2F Q716 6D
JIHGF
1
2
3
4
5
6
7
5
A B C D E
P
TP58
TP57
P
+15V
KAC-8405
KAC-9405/9405M
1
2
3
4
(X09-8940-10) (A/2)
J1
A
B
RL
R : RED
J2
BL+
109
AL+
BL-
758
AL-
6
BR-
314
AR-
BR+
2
AR+
(X09- ) (B/2)
TP210
TP209
C219
TP102
TP100
TP101
TP202
TP201
AL+
AL-
AR-
AR+
D203
0.01
D204
TP99
BL+
BL-
BR-
BR+
R101
C103
1K
10u50
C101
1000P
BR
BL
BL+
BL-
BR-
BR+ AR+
BL
BR
TP251
TP253
TP254
TP252
R251
R252
R102
1K
R201
1K
R202
1K
R253
100K
R255
2.2K
100K
R256
100K
R254
2.2K
100K
C102
C201
C202
1000P
1000P
1000P
C104
10u50
C253
C254
C252
C203
10u50
C204
10u50
TP103
R105
+
4.7K
10K
R103
10K
R104
R106
+
4.7K
C251
BL+
0.1
BL-
0.1
BR-
0.1
BR+ AR+
0.1
R205
+
4.7K
10K
R203
10K
R204
R206
+
4.7K
C105
10K
R107
10K
R108
C106
TP104
TP203
C20510K
R207
10K
R208
C206
TP204
15P
TP105
15P
AL+
AL-
AR-
TP152
15P
TP205
TP206
15P
38
2
IC1(1/2)
R109 12K
R110 12K
IC1(2/2)
6
5
TP151
TP153
TP154
2
IC3(1/2)
R209 12K
R210 12K
IC3(2/2)
6
5
4
R151
R152
83
4
1
TP107
TP108TP106
7
2.2K
2.2K
1
TP207
TP208
7
R153
100K
R155
100K
R156
100K
R154
100K
ISO
ISO
R111
10K
R113
10K
R114
10K
R112
10K
C151
0.1
C153
0.1
C154
0.1
C152
0.1
R211
10K
R200
1K
R213
10K
R214
10K
C200
1000P
R212
10K
AL+
AL+
AL-
AR-
BR+
AL-
BR-
AR-
BL-
C107
C108
AR+
BL+
C207
C208
0.01
0.01
0.01
0.01
D708
D709
C109
C110
C209
C210
100P
100P
100P
100P
R115
R116
R215
R216
10K
10K
TP731
R754
2.2K
10K
10K
C718
15P
15P
C112 C111
10u50
15P
C211
15P
C212
D710
+
TP732
IC2(1/2)
2
R117 10K
C113 100P
C114 100P
R118 10K
6
5
C719
10u50
Q715
IC4(1/2)
318
2
R217 10K
C213 100P
C214 100P
R218 10K
6
5
83
4
AUTO
P-CON
+
R756
4
1
7
IC2
(2/2)
10K
C720
7
IC4
(2/2)
Q716
TP733
1000P
C117
47u16
+
C118
47u16
+
R757
C217
47u16
+
C218
47u16
+
10K
R755
4.7K
R758
100K
R119
R120
R219
R220
47K
47K
55
58
47K
47K
-B
+B
-15V
+15V
15V AVR
15K
5.6K
33.0V
TP61
C19
C20
R52
C21R53
47u25
++
C22
47u25
5.6K 5.6K
TP60
++
3300u50
3300u50
D14
D15
Q20
Q21
D17 D16
C23
C24
47u25
47u25
T
T
AL
AR
R49
R51
5.6K
R50
-33.0V
BL
BR
TP405
R417
10K
C415
0.01
100K
R415
1
TP403
C407
4.7u50
220
R413
C408
4.7u50
220
7
R414
TP404
100K
R416
C416
0.01
R418
10K
TP406
+
+
IC10
(1/2)
IC10
(2/2)
R406
R405
47K
47K
R407
R408
3K
3K
IC9(1/2)
3
2
R409 18K
C403 27P
TP401
R411
R412
TP402
C404 27P
R410 18K
6
5
8
1
8
2
3
C405
0.47
C406
33K 33K
0.47
5
6
4
7
4
C401
R403
10u50
1K
MONO/ST
5
S2
430
430
R401
R402
VR2
6
15.0V
-15.0V
R404
1K
C402
10u50
IC9(2/2)
CN33
8
745
6
123
R419
2
8
3
IC11(1/2)
S3
IC11(2/2)
5
6
4
R420
10K
10K
1
7
TP407
50Hz-200Hz
BASS BOOST
40Hz +18dB
R421
10K
R422
10K
R424
2.2K
TP409
R423
2.2K
VR4
TP408
TP413
TP412
0.33
C418
R426
R425
C417
R427
TP410
3K
R428
10K
3K
0.33
10K
IC12(1/2)
3
2
C421
0.01
3
2
R429
R430
IC13(2/2)
6
5
C422
0.01
IC12(2/2)
6
5
16K
16K
8
C419
0.047
IC13
(1/2)
8
4
C420
0.047
4
C425
10u35
1
+
47K
R433
47K
R431
C427
10u35
1
+
TP601
S5
C428
10u35
7
+
47K
R432
47K
R434
C426
10u35
7
+
TP602
HPF/OFF/LPF
7
X09-8940-10 (1/4)
6
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