Kenwood KAC-9103-D 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
KAC-9103D
1
PC BOARD (FOIL SIDE VIEW)
AUDIO UNIT X09-5820-14 A/2 (J76-0072-41)
C31
D23
W65
R154
C152
R156
C108
R65
Q26
R508
W328
Q30
BE
R64
W326
BE
EB
EB
E
B
R155
R153
BE
R152
D151
W62
W61
W109
D601
C504
D904
C520
J4
R66
+15V
Q414
Q410
Q411
Q415
C153
R151
W59
W60
D602
D906
R527
D502
R528
24
R52
BE
R53
BE
R161
C151
C617
W323
C604
R607
R609
58
IC61
41
R605
R603
R604
W324
D908
Q501
BE
R526
R507
13
Q25
R606
D907
R525
W322
W360
R506
W58
W54
R646
C616
C602
C505
D10
C601
W49
W50
Q4
D9
W53
W44
W45
R503
R501
R502
R504
W43
Q603
C603
W57
R509
W52
BE
C5
W46
R645
D608
W56
R608
R12
W356
BE
R602
R11
R13
W321
W55
R601
W320
C4
Q2
R73
R206
R199
BE
Q609
C195
C196
D606
C25
Q611
R10
R68
Q187Q189
W27
W26
W25
C613
R9
SGDDSG
R203
R204
W48
W36
W37
W115
W38
C611
Q607
Q606
E
R627
R625
B
EB
R626
C610
R624
Q605
Q604
W51
EB
EB
R623
W34
Q612
W131
EB
W41
Q602
R615
D607
C3
D604
R617
R610
R611
D5
R4
BE
R2
BE
D8
Q1
R622
R616
R621
R619
C608
IC62
14
R612
C605
R3
R5
R6
Q5
BE
C501
C503
C502
C519
R614
R613
BE
C607
C609
Q3
EB
W40
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
W23
W22
W124
W114
+B
W122
L4/L14
R200
W19
W20
W21
R629R630
W505
R48
W506
L14
W18
P1
W123
W121
W129W130
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
Q403
EB
Q413
C510
C511
D501
R107
C156
C302
C301
C105
R111
10
R159
W74
9
W69
W99
BE
BE
W71
D110
R109
W353
C303
R303
W330
W331
R158
C154
IC32
D109
C106
R110
EE
Q409
R510
R112
R108
C35
Q412
Q408
C155
R160
R157
58
41
Q151
R301
W132
W133
W68
D107
1
2
R415
R413
R411
R416
R414
R412
C304
W64
W66
R302
W329
W67
D108
W95
C36
2
3
R426
C406
D402
R424
IC13
R423
C405
W135
W107
W100
R425
D401
W350
C522
4
W106
W104
W134
5
W103
W136
C32
W354
R420
R419
Q418
R417
C401
BE
W352
Q401
R406
BE
R401
BE
W348
Q405
W355
D186
W92
C181
814
71
R514
W93
C518
C517
D181
R511
W401
W85
R208
R209
C507
R512
IC51
R523
C515
R522
R529
R182
R181
C508
W84
58
41
PWM
C183
+5V
D183
IC12
W87
C521
R513
C514
CN1
R117
C104
C101
W89
C114
R106
R101
C102
J1
R102
R124
R122
C112
R123
W102
28
W105
17
W108
6
R118
R210
C103
D101
R211
W119
R105
R103
C117
W346
W94
R104
W361
LINE
OUT
LINE
IN
SPEAKER
LEVEL
INPUT
REMOTE
SPEAKE
7
Refer to the schematic diagram for the values of resistors and capacitors.
4
JIHGF
KAC-9103D
1
W14
R207
R202
C20
C16
J3
W505
W506
P1
W129
Q190
L4
R201
W15
W128
W127
C26
P2
C40
C198
C199
D4
Q188
R636R637
W504
C21
R46
R47
C23
W120
C15
P-CON GND
R1
DDSG SG
C194
C193
-B
R49
C197
W16
W126
W125
W17
OUT
C22
SPEAKER OUTPUT POWER IN
X09 B/2
X09-5820-14
Ref. No. Address
IC1 6I
C402
Q416
BE
R421
R422
W9
D19
W11
W12
W13
W501
L3
TH1
R45
C19
D18
Q17
Q18
Q19
Q20
D404
D407
SDGSDGSDGSDGSDGSDGSDGSDG
C403
D403
C404
D406
D405
W309
D14
C83
W6
R17
R25
C82
C8
W357
41
R33
R32
R31
W2
R20
R19
R72
IC2
C14
C13
R30
R22
R23
WH2
13
C81
C7
C9
W305
85
R35
D81
W303
BE
Q36
D15
D12
W302
W304
W1
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
2
3
Q36 3I
Q37 6I
Q12
C18
Q38 6I
Q41 5I
Q42 2C
4
Q43 5I
C17
W7
W8
Q13
Q151 4C
Q187 2E
Q188 2G
Q189 2D
W502
Q14
Q15
W5
D3
D2
J5
W358
Q43
BE
W112
Q41
EB
Q10
R43
BE
R37
R41
W308
BE
R39
Q11
BE
R44
R38
Q9
R42
D1
BE
R40
Q38
BEBE
D16
D17
R70
W3
C10
W306
W301
R29
R71
18
IC1
169
W116
C12
R34
C11
R36
Q8
W307
Q37
W10
L1/L11
L11
C1
L1
W503
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
5
6
Q605 4D
BATT
Q606 4D
Q607 4D
Q608 5D
Q609 5D
Q610 5D
Q611 5D
Q612 4D
7
5
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