Kenwood KAC-5203 Service manual
POWER AMPLIFIER
KAC-5203
SERVICE MANUAL
Panel
(A64-4134-02)
© 2007-1 PRINTED IN JAPAN
B53-0495-00 (N) 955
Connecting cord assy
(E30-6145-05)
Screw set
(N99-1587-05)
Accessory
(W01-1607-05)
Fuse (25A)
(F52-0014-05)
Screw washer
(N09-4215-08)
Rear panel
(A84-0463-02)
This product uses Lead Free solder.
KA C-5203
BLOCK DIAGRAM
LINE IN
Lch
LINE IN
Rch
SPEAKER
IN
IC1,2 VR1
J1
J2
ISOLATION
AMPLIFIER
INPUT SENSE
IC1,2 VR1
ISOLATION
AMPLIFIER
INPUT SENSE
D8,9
15V AVR
TH1
THERMAL PROTECTION
+11dB 0dB 27dB
IC3
LPF
80Hz 12dB/OCT
(+6dB)
L1
DC-DC CONVERTER
Q615,616
MUTE
IC3
Q610-614
SHOCK NOISE MUTE
Q606-609,617-621
DC DETECT &
OVER CURRENT PROTECTION
Q3
P. CON CIRCUIT
Q602
OVER V OLT AGE PRO TECTION
Q217,219
POWER
AMPLIFIER
Q218,220
POWER
AMPLIFIER
J3
SPEAKER OUT
Lch
SPEAKER OUT
Rch
P. CON
BATT.
2
KA C-5203
COMPONENTS DESCRIPTION
● AUDIO UNIT (X09-8612-70)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1,2 Input Isolation AMP
IC3 Pin 1-3: LPF, Pin 5-7: Inverter
IC4 DC-DC Comparator
IC5 Attenuator Driver
Q3-6 FET Driver
Q7,8 For DC-DC Comparator
Q201~204 Difference AMP 1st Stage
Q205,206 Current Mirror
Q207~210 Difference AMP 2nd Stage
Q211,212 Temperature Compensation
Q213~216 Darlington 1st Stage
Q217~220 Final Stage
Q601 Voltage Supply
Q602 Over-voltage Protection
Q603 P.CON
Q604,605 Mute Driver
Q606~609 DC Protection
Q610~614 Shock Noise Mute When turning power ON/OFF, the protection functions.
Q615,616 Mute
Q617~621 Over-current DET
Q622,623 Attenuator
D1 BATT Reverse Connection Protection
D2,3 IC4 Reverse Breakdown Voltage Protection
D4 Mute Driver
D6,7 DC-DC Rectifier
D8,9 15V AVR
D101~104 Static Electricity Countermeasure
D201,202 Difference AMP 2nd Stage
D203,204 Current Mirror
D601 Voltage Supply
D602 Over-voltage DET
D603 Voltage Supply
D604 Shock Noise Mute When turning power ON/OFF, the protection functions.
D605,606 Mute Driver
D607 LED Control
D609,610 DC Protection
D611~613 Shock Noise Mute When turning power ON/OFF, the protection functions.
D614~617 Over-current DET
D650 P.CON-ON DET
When P.CON is ON, the LED lights.
When DC protection functions, the LED goes out.
3
A B C D E
2
2
W
C
2
W
2
9
Q209
D613
D616
KAC-5203
1
PC BOARD (FOIL SIDE VIEW)
AUDIO UNIT X09-8612-70 (J76-0349-11)
2
Q213
D614
C209
R251
R213
BE
BE
C211
W127
R207
C205
R253
C219
BE
Q202
R204
BE
R210
R206
C216
R218
BE
Q210
D204
W130
W81
R236
Q220
Q211
R238
R229
BE
R211
Q205
R215
BE
Q207
C215
R217
W126
R205
R209
Q201
R203
W29
BE
Q623
BE BE
BE
W156
C214
W162
R663
W135
R24
BE
W32
R222
Q212
R219
R223
R642
BE
W84
Q622
R660
R661
W82
R644
R226
C218
B
W25
W1
R65
R228
E
R2
C610
W
W
D2
C21
W124
W123
W30
W31
C612
D1
W900
W901
3
C1
4
P1
J3
R655
C615
5
R602
BE
Q602
R606
R607
E
B
R605
D650
Q603
C601
W164
6
12 3 4 5 6 7
D601
D602
R601
R603
D607
R615
W75
W163
EB
W74
D603
R604
Q601
R611
7
D605
R610
C602
L1
C616
R656
BE
W160
D606
W73
W159
R20
R18
R16
W72
Q604
D604
SDG SDG
Q8
W69
Q5
W155
Q6
W157
W70
W68
W77
W67
W63
TH1
W154
BEBE
R14
R19
R17
R15
BEBE
W151
W158
W152
W64
W66
W86
R13
Q3
C2
W153
Q7
C8
L2
Q4
W147
W149
W150
CN1
W148
W161
C606
R620
R619
R617
Q608
BE BE BE
Q607
C605
C604
R618
BE
R621
Q606
Q609
C603
W62
D610
R616
R622
D609
C607
D6 D7
W52
C9
C10
R22
R9
R10
C3
R1
R3
R2
R5
R6
C6
18
IC4
916
R8
R7
R12
D3
W142
R11
W54
W55
W56
W57
W58
W59
W71
W60
W61
W76
Q611
41
IC5
58
R664
R666
C619
R665
BE
R653
R613
R654
W143
Q610
R612
BE
W145
R608
R609
Q612
R626
R625
R624
R628
W144
D611
R627
R629
BE BE BE BE
C608
R623
W141
Q613
W53
D4
W139
R630
R21
D2
W140
W136
Q605
W137
W138
R632
W48
R657
R4
R667
C618
R631
W79
R633
W49
W50
W51
W85
W78
W80
W47
W41
W42
Q614
C5 C7
R651
R652
W46
BE
W44
C11
C12
R650
W45
C614
W38
Q621
W43
Q217
EB
R233
R646
Q617
BE
W36
W39
C221
R237
W37
W40
R254
D202
Q208
W132
C210
R252
Q206
BE
R214
R212
W134
W34
W35
R232
Q216
BE
BE
W133
D201
Q203
Q204
C220
W131
C212
R216
C206
R208
W128
W129
W33
Q619
R648
4
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