Kenwood KDC-2027SA, KDC-3027A, KDC-308A Service Manual
CD RECEIVER
KDC-2027SA/SAY/SG/SGY
KDC-3027A/AY/G/GY
KDC-308A/AY/G/GY
KDC-4027/V/VY/Y
KDC-F327A/G
SERVICE MANUAL
Panel assy
KDC-2027SA/SAY/SG/SGY (A64-3168-02)
D
U
O
L
OFF
AUD
AUTO
AME
Panel assy
KDC-3027A//AY/G/GY (A64-3166-02)
KDC-308A/AY/G/GY (A64-3167-02)
KDC-F327A/G (A64-3169-02)
UD
O
L
OFF
AUD
VOL
TI
AUTO
© 2003-11 PRINTED IN JAPAN
B53-0104-00 (N) 1839
CD mechanism extension cord (22PIN) : W05-0618-00
Front glass
KDC-2027SA/SAY/SG/SGY (B10-4462-01)
MONO
SCAN
RDM REP
Front glass
KDC-3027A/AY/G/GY (B10-4460-01)
KDC-308A/AY/G/GY (B10-4461-01)
KDC-F327A/G (B10-4463-01)
SCAN
RDM REP
CLK ADJ
PTY
CLK MENU
DC cord
(E30-6132-05)
(E30-6286-05)
Plastic cabinet assy
(A02-1486-13)
Panel assy
KDC-4027/V/VY/Y (A64-3165-02)
D
U
O
L
AUD
VOL
TI
AUTO
Mounting hardware assy
(J21-9716-03)
OFF
Front glass
KDC-4027/V/VY/Y (B10-4459-01)
PTY
M.RDM
+
CLK MENU
EXTERNAL MEDIA CONTROL
SCAN
SCRL
Antenna adaptor
(T90-0523-05)
RDM REP
-
Lever
(D10-4589-04) x 2
TDF PANEL INFORMATION
MODEL PARTS NO. PANEL NAME
KDC-2027SA/SAY Y33-1960-64 TDF-2027SA
KDC-2027SG/SGY Y33-1960-65 TDF-2027SG
KDC-3027A/AY/G/GY Y33-1960-62 TDF-3027
KDC-308A/AY/G/GY Y33-1960-63 TDF-308
KDC-4027/Y Y33-1960-60 TDF-4027
KDC-4027V/VY Y33-1960-61 TDF-4027V
KDC-F327A/G Y33-1960-66 TDF-F327
Escutcheon
(B07-3001-02)
2
S1(LOS SW)
S2(12EJE SW)
(LOE & LIM SW)
S4(8EJE SW)
LPF
LPF
IC1
MECHANISM
CONTROL IC
S3
5V SW
Q2
3.3V AVR
IC2
IC3
DSP/DAC IC
CD RF/SERVO/
Q3
APC
Q4
SW
IC4
4ch BTL
DRIVER
LD
PD
C
F
AB
E
TR COIL
FO COIL
M
M
DM1
DM2
SPINDLE
MOTOR
LOADING
MOTOR
& SLED
OPTICAL PICKUP
DPU1 :
BU5V 15
DGND 14
DATA
CLK
18
19
MUTER
MUTEL 12
13
MSTOP
MRST 11
10
LOS SW 20
21
SW
1
8EJE SW 17
A8V 9
Lch 8
AGND 7
DOUT
Rch
22
6
4MOTOR
LO/EJ 5
SGND
S7.5V 3
2
NC 16
12EJE SW
MSTOP
DATA
MRST
MUTEL
MUTER
CLK
PON
SERCH
LOE&LIM
LOE & LIM
SW
PON
INTQ
SI
AO
DSP RESET
STB
SCK
DRV MUTE
SO
CNTL
RST
SI
SCK
STB
AO
INTQ
SO
MD+
SD+
TD+
FD+
LZM
RZM
ROUT
LOUT
TX
X1
4.19MHz
Z MUTE L
Z MUTE R
16.934MHz
X2
A
B
C
D
E
PRE OUT
F
LD
PD
FDIN-
BIAS
CNT
TR+
TRFO-
FO+
SLD+
SLD-
SPD-
SPD+
TDIN-
SPIN-
SLIN+
MUTE
LO/EJ
OPEN
OPEN
BU5V
SW5V
SW3.3V
S7.5V
VREF
CD PLAYER UNIT (X32-5490-00)
KDC-2027SA/SAY/SG/SGY, 3027A/AY/G/GY
KDC-308A/AY/G/GY, 4027/V/VY/Y, F327A/G
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
ELECTRIC UNIT (X34- )
SWITCH UNIT (X16- )
BLOCK DIAGRAM
KDC-2027SA/SAY/SG/SGY, 3027A/AY/G/GY
KDC-308A/AY/G/GY, 4027/V/VY/Y, F327A/G
3
KDC-2027SA/SAY/SG/SGY, 3027A/AY/G/GY
KDC-308A/AY/G/GY, 4027/V/VY/Y, F327A/G
COMPONENTS DESCRIPTION
● SWITCH UNIT (X16-2462-7x/2472-7x)
Ref No. Application/Functions Operation/Condition/Compatibility
IC1 LCD driver LCD derive & Key input interface
IC2 Sensor Remote control sensor
Q1 Key scan detect key scan start at base gose “L”.
Q2 LED SW When Q2 base gose “H” LED is light on RED Color
Q3 LED SW When Q2 base gose “H” LED is light on GREEN Color
● CD PLAYER UNIT (X32-5490-00)
Ref No. Application/Functions Operation/Condition/Compatibility
IC1 Mechanism control When BU5V & MSTOP (12pin) goes “H” (IC1 is active)
IC2 SW3.3V AVR When CNTL (1pin) goes “H” (SW3.3V AVR : ON)
IC3 CD DSP & servo IC CD RF amp, Servo, DSP & DAC
IC4 BTL driver Focus, tracking coil, Sled & Spindle motor driver IC
Q2 SW SW5V SW transistor
Q3 APC Auto P ower Control
Q4 SW EQ SW transistor
● ELECTRIC UNIT (X34-3102-7x)
Ref No. Application/Functions Operation/Condition/Compatibility
IC1 System control IC System control microprocessor
IC4 Audio power IC Audio power amplifier
IC6 RDS decoder RDS decoder IC
IC7 Power supply IC Multi AVR IC (for 5V, 8V, P-CON & P-ANT)
IC8 Muting logic IC Control for MUTE, P-ANT & RESET muting
IC10 E-VOL & tuner IC E-VOL. FM/AM tuner & stereo decoder
IC11 Reset IC When BU5V line voltage is less than 3.5V, this IC output line is “L”
IC12 E2PROM Memorized tuner adjustment data (save & load)
Q10 BU detector When the base goes “H” during BU applied (ON)
Q20 ACC detector When the base goes “H” during ACC applied (ON)
Q40 Muting driver foe Q223, 224 When the base goes “L” (Muting : ON)
Q50 SW5V When the base goes “L” (SW5V : ON)
Q51 SW Control SW for IC7
Q55 SERVO +B AVR Servo AVR (7.4V)
Q70 Serge detector When the base goes “H” (Serge detection)
Q101 DSI illumination SW When the base goes “L” (DSI illumination : ON)
Q102 Panel 5V SW When the base goes “L” (Panel 5V : ON)
Q201 Noise buffer Tuner audio noise buffer amplifier
Q223,224 Preout muting SW When the base goes “H” (Preout muting : ON)
Q251 SW When the base goes “L” (IC4 : ON)
Q252 Smeter RC & MPTHTC SW RC & TC is “LONG” when the base is “H” (base is “L” is AF search)
Q253 Smeter RC & MPTHTC SW When collector is “H”, emitter is “H”
Q501 AM RF amplifier When the base goes “H” (RF circuit gain is up)
Q502 FM RF amplifier When the base goes “H” (RF circuit gain is up)
Q503 MPX buffer MPX input buffer with RDS
4
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