Kenwood KDC-225MR, KDC-2025 Service Manual
CD RECEIVER
KDC-225/MR
KDC-2025
SERVICE MANUAL
Panel assy
KDC-225 (A64-3172-02)
D
LOU
AUD
AUTO
AME
OFF
Front glass
KDC-225 (B10-4465-01)
© 2003-12 PRINTED IN JAPAN
B53-0112-00 (N) 764
CD mechanism extension cord (24PIN) : W05-0934-00
+
C.S.
SCRL
-
M.RDM
SCAN
RDM REP
CLK ADJ
DC cord
(E30-6322-05)
(E30-6323-05)
Panel assy
KDC-225MR (A64-3361-02)
D
LOU
AUD
AUTO
AME
Panel assy
KDC-2025 (A64-3305-02)
D
LOU
AUD
AUTO
AME
* Escutcheon
(B07-3097-02)
(B07-3098-02)
Front glass
KDC-225MR (B10-4559-01)
OFF
Front glass
KDC-2025 (B10-4548-01)
OFF
Mounting hardware assy
(J21-9716-03)
SCAN
SCAN
RDM REP
RDM REP
Lever
(D10-4589-04) x 2
M.RDM
M.RDM
CRSC
DISP ADJ
CRSC
CLK ADJ
-
-
Screw
(N84-4016-46)
+
+
Plastic cabinet assy
(A02-1486-13)
Screw set
* Not supplied
(N99-1719-05)
* Depends on model. Refer to the parts list.
* Remote controller assy
(A70-2040-05) : RC-505
TDF PANEL INFORMATION
MODEL PARTS NO. PANEL NAME
KDC-225 Y33-1940-60 TDF-42D
KDC-225MR Y33-1940-62 TDF-42DMR
KDC-2025 Y33-1940-61 TDF-42DB
2
1200mV
DXM-6060
DXM-6560
DXM-6540 : 810mV
: 1200mV
: 1200mV
1Vpp@75
Term.
SWITCH UNIT (X16- )
TUNER
CD/VCD
CH
BUFFER
RDS
DECODER
BUFFER
EEPROM
REMOCON
RESET SW
WITH
LCD DRIVER
KEY MATRIX
LCD
DSI
SYSTEM
MPX
E-VOL
&
ACC DET
TEL MUTE
B.U DET
PRE MUTE
DRIVER
MUTE
POWER
IC
THERMAL
PROTECT
ACC
TEL MUTE
BACK UP
(REAR)
PRE OUT
SP OUT
SURGE DET
SERVOSERVO+B
SW 14V
WIRED REMO
SUPPLY
IC
POWER
ANT CON
P CON
RESET
SW 5V
PANEL 5V
SW5V
ILL SW
ILLUMI
IC7
IC2
IC1
IC4
IC3
IC8
IC1
IC2
SW
ANALOG
AUX IN
AUDIO
PARK SW
PARK SW
MICROPROCESSOR
MECHA+B MECHA +B
IC
VIDEO OUT
IC9
IC6
to VIDEO OUT
TUN SMETER
AUDIO OUT
TUN IFC OUT
TUN SCL
TUN SDA
SW5V
AM+B
A8V
CD DISC8 SW
CD DISC12 SW
CD LOS SW
CD SDA
CD SCL
CD LOE LIM SW
CD MUTE L
CD LOEJ
CD MSTOP
CD MRST
SERVO+B
A8V
BU5V
MECHA+B
LX DATA S
LX MUTE
LX RST
LX REQ M
LX REQ S
LX CLK
LX COM
LX DATA M
BACK UP
RDS QUAL
S-METER
RDS DATA
RDS CLK
FM
AM
MP
LEVEL
CD
QUAL
AFS
CH
SW5V
SW5V
BU5V
DSI
L CLK
L DATAS
L CE
L DATAL
REMO
MUTE
PWIC MUTE
LINE MUTE
ACC DE
B.U DET
PWIC BEEP
RST
BU5V
A8V
SW5V
AM+B
ILLUMI
A8V
BU5V
BU5V
MODE
FM
AM
MP3
E-TYPE
1372mV
855mV
3600mV
K-TYPE
1800mV
600mV
3600mV
PWIC STBY
BU5V
TDF DET
SW5V
AUD SCL
AUD SDA
A8V
PON 5
PARK SW
MUTE PRE
PS2-1
PS1-0
PS2-0
PS1-2
PS1-1
PON CD
A8V
CD MOTOR
CD MUTE R
VIDEO OUT
AUX SW
RDS AFS
RDS NOISE
SW5V
SW5V
L RST
KEY REQ
BU5V
ELECTRIC UNIT (X25-)
KDC-225/225MR/2025
BLOCK DIAGRAM
KDC-225/225MR/2025
COMPONENTS DESCRIPTION
● SWITCH UNIT (X16-2640-11/12)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 LCD driver Drive for LCD unit
IC2 Remote control IC Receiving for the remote control unit
Q1 KEY scan detector key scan start at base gose “L”.
● ELECTRIC UNIT (X25-9980-11/12/21)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 System microcomputer
IC2 Electronic volume & N.C.MPX Control for source selector, volume & tone, and FM multiplex detector.
IC3 Power supply IC
Control for TUNER unit, CD mechanism, volume & tone, LCD driver and external CD changer unit
Power supply for the units (Bu5V, Audio8V, FM+B, AM+B, P-con and ANT-con)
SW1 OUT
1.5~3.0V Audio ON
3.5~5.0V Audio P-con ON
7.0V~ Audio P-con, P-ant ON
SW2 OUT
2.0~3.0V Illumination, FM ON
4.0V~ Illumination, AM ON
IC4 Audio power amp IC Amplifier for audio signal to derive for 4channel speakers (50W maximum for each channel)
IC6 Muting control IC Control for timing for mute
IC8 Reset IC When detection voltage goes below 3.5V or less Reset IC output change to “L” signal
Q1 Serge detection
Q2 Backup detection
Q3 ACC detection When ACC voltage supplied output is “L”
Q4 SW 5V When base voltage is “L” Q4 is ON
Q21,24 AVR Servo regulator
Q22 SW Servo SW
Q151 DSI driver
Q201 Buffer amp Noise buffer amp
Q252
Q350 Pre & NF mute SW When base voltage to “L”, drive to pre & NF mute SW (Q351)
Q351 Pre mute SW When base voltage to “H”, muting to the pre Lch or NF Lch line
Q352 Pre mute SW When base voltage to “H”, muting to the pre Rch or NF Rch line
Q401 DSI illumination SW When base voltage to “H”, DSI illumination is light up.
For surge measure of audio power IC
When backup voltage become more than 24V output is “L” (momentary power down) /
When backup voltage become less than 24V output is “H”
When BU voltage supplied output is “L” /
When BU voltage not supplied or momentary power down is detected output is “H”
When base voltage level is “L” DSI LED is light up / When base voltage level is “H” DSI LED
turns off / When panel assy is pull off, cut off the supply to panel 5V AVR.
When base voltage to “L”, for control to power IC function (STAND BY)
3
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