Kenwood KDC-225MR User manual

© 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
LOUD
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
LOUD
CRSC
Front glass
KDC-225MR (B10-4559-01)
Panel assy
KDC-225MR (A64-3361-02)
AME
M.RDM
+
-
AUTO
SCAN
AUD RDM REP
OFF
LOUD
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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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299

2
KDC-225/225MR/2025
BLOCK DIAGRAM
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-)
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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299

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 forTUNER 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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1 5 1 5
0 9 9
2
8 9
4 2
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T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299

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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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299

5
KDC-225/225MR/2025
MICROCOMPUTER’STERMINAL 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
3LINE MUTE I Phone Muting signal input terminal (More than 2.5V : NAVI mute, Less than 1.0V :TEL mute)
4AVSS - GND
5LRST O Reset signal output (for LCD driver) H : Light on display, key scan, L : Light out on display, key reset
6LCE O CE output for LCD driver IC
7AVREF1 - BU5.0V
8LDATAL I DATA input terminal from LCD derive IC
9LDATAS 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
w w w . x i a o y u 1 6 3 . c o m
Q Q
3
7
6 3
1 5 1 5
0 9 9
2
8 9
4 2
9 8
T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
Q Q
TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299