Kenwood KAC 6403 Service Manual

Page 1

POWER AMPLIFIER

KAC-6403 KENWOOD

Kenwood Corporation
SERVICE MANUAL

© 2006-1 PRINTED IN JAPAN
853-0378-00 (N) 540

Rear panel Screw washer EXPLODED VIEW is on page 5.
(A84-0410-02) (N09-6393-08)

Screw washer Fuse (25A)
(N09-4215-08) (F52-0014-05)

l

$5
@CTIS
Heat sink
F01-3511-01
m g ( )
0
v 0
\ In
0 L (I) o
<
54 I
mm It
A 1 §§ '" fl .
2g 3 Connectlng cord assy
/ I: E 4 (E30-6144-05)
3% 2
3
N7 fl
IQ 2 IE
<
E
@/ Screw set
[g1] D 13:? / @mm -(N99»1587»05)
O O J
I> , O
B
0
Z ,,
\ Accessory
e @ (WO1-1606-05)

Panel
(A64-3834-02)

This product uses Lead Free solder.

Page 2

KAC-6403

AUDIO UNIT (X0978542770)

BLOCK DIAGRAM

0101.102. 0103-114,
J1 IC2 VRI [Cg 0151,153.R165.167 m 201.202 II9-12s J9
L T ISOLATION HPF 32 POWER 3
AMPLIFIER .1 8on Izda/OCT A AMPLIFIER
Ach Aaua ATT
LINE INA LEI/SW GIGS-HA,
ICE C152,154.R165.168 119-126
CONT log 7
R c ISOLATION POWER 3
jAMPLIFIER .1 AMPLIFIER
MUTE 0203-214,
I04 VR2 S3 8 '06 219-225
3
ISOLATION J5 POWER
'- ° AMPLIFIER 31 AMPLIFIER °
1 Bch +I .
LINE IN E I LEI/SW . K '3? ATT 0203-214,
I04 I CONT. 1 : 05 219-226
R c ISOLATION I - POWER 3
_ AMPLIFIER . . AMPLIFIER
I . - _1
Odo ATT '
03,4 L2 O115-I132I5-218
J2 : 15V DC/DC DC DETECT &
- AVR CONVERTER OVER ROAD PROTECTION
SPEAKER 0605
< - RCON
NPUT CIRCUIT 4
_ THI ICI 3
THERMAL OVER VOLTAGE AD
PROTECTION PROTECTION _
k +6dE * OdB * +29.5dB %

COMPONENTS DESCRIPTION

0 AUDIO UNIT (X09-8542-70)

SPEAKER
OUT A

RJ

L

SPEAKER
OUT B

RJ

P.CON

BATTERV

Ref. No Application / Function Operation / Condition / Compatibility
|C1 Buffer AMP Amplifies SOB by decreasing impedance.
ICZ Isolation AMP Decreases common mode noise.
|C3 Buffer AMP Amplifies 6dB by decreasing impedance.
|C4 Isolation AMP Decreases common mode noise.

ICS LPF B-Flch side is phase inverter.

ICG -3dB ATT B-Lch side is butler amplifier.

IC7 Buffer AMP Decreases impedance.

ICQ Phase inverter A-Lch Side is butler amplifier.

|C13 DC/DC converter Oscillates and controls DC/DC converter.
03,4 Constant voltage power supply Controls i15V constant voltage.

05,6 DC/DC converter Switching FET.

Q7~10 DC/DC converter Drives 053 and 06s gates.