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© 2003-12 PRINTED IN JAPAN
B53-0112-00 (N) 764
CD RECEIVER
KDC-225/MR
KDC-2025
SERVICE MANUAL
* Escutcheon
(B07-3097-02)
(B07-3098-02)
Plastic cabinet assy
(A02-1486-13)
Mounting hardware assy
(J21-9716-03)
Screw
(N84-4016-46)
Lever
(D10-4589-04) x 2
Screw set
(N99-1719-05)
CD mechanism extension cord (24PIN) : W05-0934-00
DC cord
(E30-6322-05)
(E30-6323-05)
AUTO
CLK
ADJ
SCAN
AUD
RDM
REP
OFF
LOU
D
CRSC
Front glass
KDC-2025 (B10-4548-01)
Panel assy
KDC-2025 (A64-3305-02)
AME
M.RDM
+
-
AUTO
DISP
ADJ
SCAN
AUD
RDM
REP
OFF
LOU
D
CRSC
Front glass
KDC-225MR (B10-4559-01)
Panel assy
KDC-225MR (A64-3361-02)
AME
M.RDM
+
-
AUTO
SCAN
AUD
RDM
REP
OFF
LOU
D
C.S.
Front glass
KDC-225 (B10-4465-01)
Panel assy
KDC-225 (A64-3172-02)
AME
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
* Remote controller assy
(A70-2040-05) : RC-505
* Not supplied
* Depends on model. Refer to the parts list.
CLK
ADJ
M.RDM
+
SCRL
-


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2
KDC-
225/225MR/2025
BLOCK
DIA
GRAM
1200mV
DXM-6060
DXM-6560
DXM-6540 : 810mV
: 1200mV
: 1200mV
[email protected]
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
SERVO
SERVO+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
Q
U
AL
S-METER
RDS
D
A
T
A
RDS
CLK
FM
AM
MP
LEVEL
CD
QUAL
AFS
CH
SW5V
SW5V
BU5V
DSI
L
CLK
L
D
ATA
S
L
CE
L
D
ATA
L
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
A
UX
SW
RDS
AFS
RDS
NOISE
SW5V
SW5V
L
RST
KEY
REQ
BU5V
ELECTRIC UNIT (X25-)


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3
KDC-225/225MR/2025
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
Control for TUNER unit, CD mechanism, volume & tone, LCD driver and external CD changer unit
IC2
Electronic volume & N.C.MPX
Control for source selector, volume & tone, and FM multiplex detector.
Power supply for the units (Bu5V, Audio8V, FM+B, AM+B, P-con and ANT-con)
IC3
Power supply IC
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
When backup voltage become more than 24V output is "L" (momentary power down) /
When backup voltage become less than 24V output is "H"
Q2
Backup detection
When BU voltage supplied output is "L" /
When BU voltage not supplied or momentary power down is detected output is "H"
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
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.
Q201
Buffer amp
Noise buffer amp
Q252
For surge measure of audio power IC
When base voltage to "L", for control to power IC function (STAND BY)
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.
COMPONENTS DESCRIPTION
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


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4
KDC-225/225MR/2025
CD PLAYER UNIT (X32-5400-00)
Ref. No.
Application / Function
Operation / Condition / Compatibility
Generation of RF signal based on the signals from the APC circuit and pickup, and generation
IC1
RF amplifier adapted for CD-RW
of servo error (focusing error and tracking error) signals. Detection of dropout, anti-shock,
track crossing and off-track conditions, included gain control function during CD-RW.
Focusing, tracking, sled and spindle servo processing. Automatic adjustment (focusing,
IC2
CD signal processor built-in MI-COM
tracking, gain, offset and balance) operations. Digital signal processing (DSP, PLL, sub-codes,
CIRC error correction, audio data Interpol ration) operations, and Microcomputer function.
IC3
4CH BTL driver
Focusing coil, tracking coil, spindle motor and sled motor driver, disc loading and eject operation.
IC4
Low pass filter
2nd low pass filter for audio signals
Q1
APC
LD power control
Q2
D.5V SW
When P ON signal gose "L", Q2 is ON
Q3
Q4 SW
When P ON signal gose "L" (SW+5V AVR is ON), Q3 is ON
Q4
A.8V SW
When P ON signal gose "L" (Q3 is ON), Q4 is ON
Q5
Current driver
Current driver
Q6
Current driver
Current driver
D1
Protection diode
Laser diode protection
D2
Zener diode
DAC AVR/LPF reference voltage (A.5V)
D3
Current driver
Current driver
COMPONENTS DESCRIPTION


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5
KDC-225/225MR/2025
MICROCOMPUTER'S TERMINAL DESCRIPTION
SYSTEM MICROPROCESSOR : 784225GC233A (X25 : IC1)
Pin No.
Pin Name
I/O
Description / Processing Operation
1
TUN SMETER
I
S meter detection input terminal
2
RDS NOISE
I
FM noise detection input terminal
3
LINE MUTE
I
Phone Muting signal input terminal (More than 2.5V : NAVI mute, Less than 1.0V : TEL mute)
4AVSS
-
GND
5L RST
O
Reset signal output (for LCD driver)
H : Light on display, key scan, L : Light out on display, key reset
6L CE
O
CE output for LCD driver IC
7AVREF1
-
BU5.0V
8L DATAL
I
DATA input terminal from LCD derive IC
9L DATAS
O
DATA output terminal to LCD driver IC
10
L CLK
O
CLK output terminal to LCD driver IC
11
TDF DET
I
Panel assy detect terminal
H : Panel assy come off
12
AUX ON
O
Select for AUX input signal
H : AUX, L : Other
13
RDS QUAL
I
RDS decoder QUAL signal input terminal
14
RDS DATA
I
RDS decoder Data signal input terminal
15
PWIC BEEP
O
Beep audio signal output terminal
16
LX DATA S
I
DATA signal input from EXT. unit
17
LX DATA M
O
DATA signal output to EXT. unit
18
LX CLK
I/O
CLK signal input/output to EXT. unit
19
TUN SCL
O
I2C CLK signal output terminal (for front-end)
20
TUN SDA
I/O
I2C DATA signal input/output terminal (for front-end)
21
TUN IFC OUT
I
IFC signal input terminal
H : Station detect, L : No detect
22
RDS AFS
O
Time constant select terminal (for noise detect)
H : Receiving, L : FM seek, AF search
23
CD SDA
I/O
I2C DATA output terminal (for CD mechanism, electric VR)
24
AUD SDA
O
CLK output terminal (for CD mechanism, electric VR)
25
NC
-
NC
26
LX RST
O
Reset signal output to EXT. unit
27
LX CON
O
Control signal output to EXT. unit
H : ON L : OFF
28
LX MUTE
I
Request signal input terminal from EXT. unit
L : Mute ON
29
LX REQ M
O
DATA signal output to EXT. unit
30
PWIC SVR
O
SVR control for Audio power IC
31
PWIC STBY
O
STBY control for Audio power IC
H : Power IC ON
32
PWIC MUTE
O
Muting control for Audio power IC
33
VSS1
-
GND
34
ACC DET
I
ACC detection input terminal
L : ACC detect
35
RESET2
O
Reset output terminal
L : Active
36
MUTE
O
Muting signal output terminal
37
BU DET
I
BU detect input terminal
L : BU detect
38
PARK SW
I
Packing condition detect terminal
H : OFF, L : ON (PARKING)
39
PS2 1
O
Power supply IC control terminal