Kenwood KDC-3024A, KDC-307A Service Manual
©
2002-11 PRINTED IN JAPAN
B53-0002-00 (N)1874
COMPACT
DIGITAL AUDIO
RDMLOUD REPSCAN
OFF
KDC-XXXX
PTY
VOL. ADJ
TI
MENUCLK
AUD
50W
x4
Panel assy
(A64-2876-02): KDC-3024A/G/YA/YG
(A64-2877-02): KDC-307A/G/Y
Escutcheon
(B07-3001-02)A/YG
DC cord
(E30-4790-05)
Plastic cabinet assy
(A02-1486-13)
Lever
(D10-4589-04)x2
Antenna adaptor
(T90-0523-05)
Mounting hard ware assy
(J21-9716-03)
CD RECEIVER
KDC-3024A/G/YA/YG
KDC-307A/G/YA/YG
SERVICE MANUAL
CD mechanism operation description is not in this sarvice manual.
Please, refer to sarvice manual X92-4030-0x (B51-7867-00).
CD mechanism extension cord : W05-0618-00
KDC-3024A/G/YA/YG,307A/G/YA/YG
2
BLOCK DIAGRAM
1200mV
1200mV
CD : 3600mV
CH : 3600mVAM(E) : 855mV
FM(E) : 1372mV
FM(J,K) : 1800mV
AM(J,K) : 600mV
CHANGER
KEY MATRIX
WITH
LCD DRIVER
LCD
REMOCON
MI-COM
CD
ANT
AM AGC
FM AGC
DECODER
RDS
RESET
IC
EEP-ROM
TUNER,MPX &
E-VOL.
SUPPLY IC
SW5V
SERVO
P-ANT
P-CON
POWER
MUTE
LOGIC
DET
ACC
BU
DET
MUTE
PRE
POWER IC
SP
ACC
UP
BACK
OUT
OUT
PRE
IC1
DATA H
MUTE
DATA C
REQ H
CH-CON
AUDIO OUT
CLK
REQ C
RST
BACK UP
BU5V
IC2
SW5V
LO/S
RST
LOE/LIM
MO
LO/EJ
STOP
MUTE
8EJE
SDA
SCLK
AUDIO OUT
12EJE
Q501
Q502
AM+B
FM+B
AM AGC OUT
IC6
CH
CD
SERVO
BU5V
A8V
TUNER OUT
BU5V
IC11
IC12
IC10
FM AGC OUT
A8V
SW2
SW1
ILLUMI
VCC
BU5V
AUDIO+B
AM+B
FM+B
BACK LIGHT
KEY ILLUMI
Q51,55
SW5V
Q50
SERVO
BU5V
FM+B
AM+B
A8V
P-CON
P-ANT
IC8
Q20
Q10
IC7
MUTE
Q223,224
IC4
KDC-3024A/G/YA/YG,307A/G/YA/YG
3
● SWITCH UNIT (X16-1472-7x)
COMPONENTS DESCRIPTION
Ref.No.
Application/Functions Operation/Condition/Compatibility
IC1 LCD driver & key matrix
Q1 Key scan start When Q1 base goes Lo, key scan start.
● ELECTRIC UNIT (X25-9612-7x)
Ref.No.
Application/Functions Operation/Condition/Compatibility
IC1 System control µ-com System µ-com
IC4 Power amplifire E-Vol output encoder power amplification for speaker.
IC6 RDS decoder RDS data decode to tuner receive signals.
IC7 Power supply (Multi AVR) -
When a pin 1, 2, or 13 is "H", MUTE turns on
IC8 MUTE Logic When a pin 3, 4, or 5 is "H", P-AMP mute turns ON.
Changer is RESET when a pin 9, 10, or 11 is "L".
IC10 Tuner & E-Vol. FM/AM tuner & stereo decoder & E-Vol.
IC11 Power on reset When B.U. 5V voltage is less than 3.5V, power reset.
IC12 E2P-ROM Writing and read-out of adjustment data for a tuner
Q10 B.U. detector BU on (base "H") : Collector "H"
Q20 A.C.C detector ACC ON (base : "H") : Collector "L"
Q40 MUTE driver Base "L" : Mute on (collector "L")
Q50 SW 5V Base "L" : SW5V on
Q51 SERBO AVR control Pin 2 "H" : Serbo on (pin 4 "H")
Q55 SERBO AVR Base "H" : Serbo on
Q70 Surge detector Base "H" : Surge detect
Q101 DSI driver Base "H" : DSI on
Q102 PANEL 5V SW Panel attch : PAN5V on
Q201 Noise buffer Tuner noise input, Emitter output
Q223,224
MUTE Base "H" : Mute on
Q252 S_METER RC & MPTH TC SW Base "H" : RC&TC=Long (Base "L" at AF serch)
Q253 S_METER RC & MPTH TC SW Emitter "H": Collector "H"
Q501 AM RF amplifire Base "H" : Gain UP
Q502 FM RF amplifire Gate "H" :Gain UP
Q503 MPX buffer MPX input buffer with RDS
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