KENWOOD KAC-9103D Service Manual
POWER AMPLIFIER
KAC-9103D
SERVICE MANUAL
© 2006-11 PRINTED IN JAPAN
B53-0471-00 (N) 957
BOOST
CONTROL SYSTEM
Fuse (30A)
(F52-0015-05)
Accessories
(W01-1606-05) x2
Class D Mono
Power Amplifier
Screw set
(N99-1794-05)
Dressing Panel
(A21-6563-02): (K type)
(A21-6564-02): (E,M type)
E,M type
K type
Connecting cord assy
(E30-6145-05)
19cm
This product uses Lead Free solder.
This product complies with the
RoHS
directive for the European market.
KA C-9103D
BLOCK DIAGRAM
LINE IN
LINE OUT
SP IN
X09-5820-14
IC11
50
40
30
20
10
0
-10
X08-4180-12
IC11
ISO
LEVEL DIAGRAM
ISOLATION X08 D CLASS AMP
INPUT
VOL
LEVEL
X08
INV
NOR/REV
Q151
MUTE
KAC-9103D
OUT
IC11
I.F.S
25Hz
15Hz
IC31
COMPARATOR
TRIANGLE
WAVE
SP
OUT
15V
SENS
Q25,26
+15V
AVR
-15V
AVR
Q28,42
IC12,13
DEAD
TIME
CONT
+15V
AVR
IC13
FREQ
L.P.F
Q401-415,187-190
D CLASS
AMP
THERMAL
PROTECT
HB
Q8-20
BASS
BOOST
OVER
LOAD
DET.
OP
AMP
D.D CON
IC12
LVL
DC
OFFSET
DET.
TR SW
P-CON
DET
SP OUT
P-CON
BATT
GND
IND
2
KA C-9103D
COMPONENTS DESCRIPTION
● PREAMPLIFIER UNIT (X08-4180-12)
Ref. No. Application / Function Operation / Condition / Compatibility
IC11 (1/2) INFRA SONIC FILTER Cutting super-low area of voice signals
IC11 (2/2) INVERTER Reversing voice signal phase
IC12 (1/2) OP AMP Voltage amplification, buffer
IC12 (2/2) BASS BOOST High-boost (variable levels)
IC13 LOW PASS FILTER Cutting high range of voice signal
IC14,15 BASS BOOST High-boost (variable levels)
● AUDIO UNIT (X09-5820-14)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 DC/DC converter IC Create drive signal for switching element
IC2 (1/2) Differential amplifier Detection of temperature, DC, and excess current and hold protection for a certain time
IC2 (2/2) Differential amplifier Containing excess voltage of ±B
IC11 Isolation amplifier Prevention of noise by the electric potential difference of GND
IC12,13 NAND Generation and forming of Dclass section reversal waveform and dead time
IC31 Comparator Digitalize signal by comparing analog signal and triangular wave
IC32 (1/2) Triangular wave generation Reference signal generation for converting analog signals to digital signals
IC32 (2/2) Error amplifier Error compensation by feedback from output
IC61,62 Comparator
Q1~3 PCON switch Turns on the circuit when ON-signal is impressed on PCON
Q4,5 Mute Mute drive signal generation, Turn LED off
Q8~11 Gate drive DC/DC converter FET gate drive
Q12~14
Q18~20
Q25,26,28 AVR ±15V AVR
Q29,30 Tracking when ±15V AVR is OFF Adjusts ‘-15V’ AVR falling to ‘+15V’ AVR falling
Q36 DC/DC converter ON/OFF control Stops DC/DC converter switching when protection is triggered
Q37,38
Q41 4.4V AVR Vref 5V reference AVR
Q42 AVR ±15V AVR
Q43 DC/DC converter ON/OFF control Stops DC/DC converter switching when protection is triggered
Q151 Mute Turning off voice signal
Q187~190 Electric power amplification Dclass large current switching
Q401~409
Q411~414
Q416 15V AVR Integration AVR for obtaining Dclass High+B
Q417,418
Q601,602 Comparator
Q603 DC/DC converter control
Q604~607
Q608~611 Latch circuit Detection and holding of output excess voltage
Q612 FAN +B When P-CON is ON, fan is rotated
DC/DC converter DC/DC converter switching
DC/DC converter pulse ON/OFF control
Pulse amplification and rectifying Generation of signal for driving Dclass final FET
Control of ON/OFF of electric Makes the electric power amplification section non-operative for 1.2 seconds when the
power amplification section power is turned on and when protection is triggered
Electric current and voltage conversion
Detection of short-circuiting of SP output and determine excess current for triggering protection
ON/OFF of DC/DC converter drive waveform
Detection of short-circuiting of SP output and determine excess current for triggering protection
Convey IC62 u pin output, result of excess current detection, to IC2 and stop the DC/DC converter
Conversion of current to voltage of the current flowing to final
3
A B C D E
Q
JIHGF
KAC-9103D
1
2
3
4
5
6
7
PC BOARD (FOIL SIDE VIEW)
W106
W104
W134
W135
W103
W136
CN1
28
17
W108
Refer to the schematic diagram for the values of resistors and capacitors.
AUDIO UNIT X09-5820-14 A/2 (J76-0072-41)
W107
W105
W100
W102
R118
C405
R425
R210
D402
R424
R426
IC13
W350
C103
D101
R423
D401
C522
R211
C406
814
71
W93
W119
R105
R103
C117
W346
LINE
OUT
R417
W92
R514
W94
R419
C401
C181
W95
R401
D181
C518
C517
W361
W401
R104
W348
R511
W85
C104
C101
R420
Q401
D186
R208
R209
C507
R512
IC51
W89
C114
R106
C36
C32
W354
Q418
R406
BE
W355
R182
+5V
D183
R181
W84
C508
58
41
R523
C515
R522
R529
C102
R101
J1
BE
W352
BE
Q405
PWM
C183
IC12
W87
C521
R513
C514
R117
R122
C112
R123
R124
R102
LINE
IN
R520
C513
R519
IC53
W75
R67
Q29
R418
R183R184
W81
R61
BE
D25
W351
Q417
R408
W88
D182
814
71
814
71
C527
R120
C111
C113
R116
C110
W79
BE
BE
Q404
W118
C526
IC11
C182
D304
D305
C523
R521
R517
C516
58
41
C109
R115
R57
BE
Q28
Q402
BE
R407
BE
Q406
R305
W110
W339
R304
R306
D303
W77
W117
R518
IC52
C509
W78
W338
C115
D105
R113
R114
R409
R516
R121
R119
Q42
R402
814
71
W337
C116
D106
-15V
R404
R405
IC31
D308
W336
R515
W333
C506
D104
R58
BE
R410
BE
Q407
58
41
R307
W332
W72
W73
C107
D103
D306
W76
R403
BE
C524
C525
J2
R162
D307
W69
W99
BE
Q403
BE
EB
W353
Q413
C156
R159
C302
IC32
C301
C303
R303
W74
C510
C511
D501
W71
D110
D109
C105
R111
R109
R107
9
10
SPEAKER
LEVEL
INPUT
R158
C154
R110
W330
W331
EE
Q409
R510
C106
R108
Q412
Q408
R301
W132
W133
R112
1
2
C35
R411
R412
C155
R160
R157
58
41
Q151
W64
W68
D107
R415
R413
R416
R414
C304
W329
W67
R154
C152
R156
W66
R302
W65
D108
C108
R65
Q26
R508
W328
C31
Q30
BE
R64
W326
BE
EB
EB
E
B
R155
R153
BE
R152
D151
W62
W61
W109
D602
D601
C504
D904
D502
C520
J4
REMOTE
D23
BE
R66
+15V
Q414
Q410
Q411
Q415
C153
R151
W59
W60
W323
C604
R605
W324
D906
R527
BE
R528
R507
13
24
R52
C617
R607
R609
IC61
R53
BE
R161
R603
Q501
R526
C151
R604
D908
KAC-9103D
1
X09 B/2
C402
Q416
BE
R421
Q25
R201
DDSG SG
C194
-B
Q188
R636R637
W504
C21
C26
R46
R47
P2
C16
C23
C22
C40
W120
C15
C197
W15
C198
W128
W127
C199
W17
OUT
P-CON GND
D4
R1
J3
L4/L14
R200
Q190
W19
W20
W21
R629R630
C193
W505
W505
R48
W506
W506
L14
W18
P1
P1
W123
W129
W121
W129W130
SPEAKE
SPEAKER OUTPUT POWER IN
R49
L4
W16
W126
W125
R206
W53
W58
W54
W49
W43
W44
W45
W50
W46
W48
W36
W37
W115
W38
C611
Q607
R627
R625
R626
C610
Q604
W51
W52
W356
R645
D608
W56
R608
BE
R602
R11
R12
R13
W321
W55
R601
W320
C4
Q2
R73
Q612
EB
D607
C3
D604
R617
R610
R611
D5
R4
BE
R2
BE
D8
Q1
EB
W34
W131
W41
R622
R616
R621
R619
C608
IC62
14
R612
C605
R3
R5
R6
Q5
BE
C501
C503
C502
C519
R623
Q602
BE
C607
C609
R614
R613
Q3
EB
W40
R646
C616
C602
R606
58
Q603
W322
41
C601
C603
W57
R509
C505
Q4
BE
D907
D10
C5
R525
D9
W360
R506
R503
R501
R502
R504
R199
BE
Q609
C195
C196
D606
C25
Q611
R10
R68
Q187Q189
W27
W26
+B
W23
W25
C613
W22
R9
W124
W122
W114
SGDDSG
R203
R204
Q606
E
B
EB
R624
Q605
EB
R615
W31
C606
BE
W319
Q601
W35
R641
58
R642
R643
D605
R638
R640
C614
C612
R8
W33
D11
W29
R74
C615
BE
Q610
BE BE
R644
W317
R639
W318
W32
W30
R7
C6
R14
D7
D6
Q608
C2
W39
W14
R207
R202
D19
W11
W12
W13
C20
L3
TH1
L1/L11
L11
C1
BATT
R45
C19
C18
C17
W10
L1
R422
W9
W501
W7
W8
W502
D3
W503
J5
D18
Q17
Q18
Q19
Q20
Q12
Q13
Q14
Q15
D404
D407
SDGSDGSDGSDGSDGSDGSDGSDG
C403
D403
C404
D406
D405
W309
D14
C83
W6
D2
R17
R25
C82
C8
W357
41
R33
R32
R31
W2
R20
R19
R72
EB
R43
R37
W5
R41
W308
R39
BE
R44
R38
R42
D1
R40
Q38
D16
D17
R22
IC2
C14
C13
R30
Q41
Q10
BE
BE
BE
13
C81
C7
C9
W305
R23
85
R35
W358
W3
R34
C11
R36
Q8
Q11
Q9
W307
BEBE
Q37
WH2
BE
D15
W1
W112
W306
W303
Q36
W304
Q43
D81
C10
D12
W302
BE
R70
W301
R29
R71
18
IC1
169
W116
C12
X09-5820-14
Ref. No. Address
IC1 6I
IC2 3I
IC11 6B
IC12 4B
IC13 4B
IC31 4C
IC32 4C
IC61 5C
IC62 5D
Q1 6D
Q2 6D
Q3 6D
Q4 6D
Q5 6D
Q8 6I
Q9 6I
Q10 5I
Q11 6I
Q12 4H
Q13 4H
Q14 5H
Q18 3H
Q19 3H
Q20 4H
Q25 2C
Q26 2C
Q28 2B
Q29 2B
Q30 2C
Q36 3I
Q37 6I
Q38 6I
Q41 5I
Q42 2C
Q43 5I
Q151 4C
Q187 2E
Q188 2G
Q189 2D
Q190 2F
Q401 3B
Q402 3B
Q403 3C
Q404 3B
Q405 3B
Q406 3B
Q407 3C
Q408 3C
Q409 3C
Q411 3C
Q412 3C
Q413 3C
Q414 3C
Q416 2H
Q417 3B
Q418 3B
Q601 5D
Q602 5D
Q603 5D
Q604 4D
Q605 4D
Q606 4D
Q607 4D
Q608 5D
Q609 5D
Q610 5D
Q611 5D
Q612 4D
2
3
4
5
6
7
4
5
K L M N O
KAC-9103D
1
PC BOARD (FOIL SIDE VIEW)
PREAMPLIFIER UNIT X08-4180-12 A/2 (J76-0068-12)
S2
OFF
15Hz
TP20
R109
R127
TP22
1
463 52
INPUT SENS
C103
C106
41
R108
W4
4
6
I.N.V
W15
R107
S1
TP18
1
3
TP21
W12
TP17
TP13
R106
C124
ONOFF
W11
R105
W20
W18
W17
VR1
200mV
5V
W8
W9
C105
TP16
W7
TP19
10
TP24
IC12
14
C108
TP38
C117
R126
C107
R111
41
TP26
R113
R112
TP25
BASS BOOST
TP45
R122
R121
TP37
C116
W10
TP42
C118
TP40
46352241365
1
LOW PASS
R125
C119
R124
TP41
R110
C101
TP15
W3
TP23
VR2
W16
50Hz
TP12
C102
TP36
200Hz
51
6
I.S.F
R102
TP11
R101
58
R103
C104
TP14
R104
W2
25Hz
IC11
C203
C202
R208
R206
R204
58
IC14
C204
C209
D1
R212
R210
C208
W252
58
R211
C207
W257
W258
IC15
W203
W256
W255
W254
41
W202
2
CN3
21
3
WH1
31
C126
R129
TP48
4
CN2
3
1
TP49
W52
41
R207
W204
W251
R209
C206
C205
18dB
0dB
W201
TP43
TP44
C121
W151
R205
W253
W21
W14
C120
W6
W5
C201
R202
R203
C122
58
R201
C109
VR3
R119
C115
R120
W13
C123
58
IC13
R123
TP39
TP27
W22
TP1
W51
+15V
W19
TP5
LED
ISO GND 1
ISO GND 2
17
82
TP7
SIG1
TP2
-15V
TP8
DGND
TP4
SIG2
TP3
CN1
X08 B/2
R623
VR62
1
3
TP63
R62
5
TP61
TP60
3
2
4
TP65
4
TP62
1
J1
X08-4180-12
Ref. No. Address
IC11 3N
TP64
VR61
1
IC12 2M
IC13 3M
IC14 2L
IC15 3L
FREQUENCY
BOOST
LEVEL
6
PREAMPLIFIER UNIT X08-4360-10 (J76-0379-02)
D1
7
C1
R1
CN1
31
Refer to the schematic diagram
for the values of resistors and
capacitors.
6
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