Kenwood KDC-419/X459 User manual

CD RECEIVER
KDC-419/X459
SERVICE MANUAL
© 2002-2 PRINTED IN KOREA
B51-7909-00 (K) 1503
The following reference numbers with accessory parts are the same reference numbers
used on EXPLODED VIEW and PARTS LIST.
213
256
276
200
222x2
Refer to the service manual "X92-4430-0x" (B51-7889-00) for MECHANISM information.
RC1
277
KDC-419 (K)
KDC-419
KDC-X459 (K)
KDC-X459
DC1

KDC-419/X459
2
BLOCK DIAGRAM
CH
CD MECHA
F/E
FM+B
PLL+B
AM+B
BUFF E-VOL
SYSTEM
u-COM
DECODER
RDS
RST IC
DET
FLIP
POSI
MATRIX
KEY
G/R SW RST SW
REMO ON
BACKLIGHT
LCD
W-ILL
DRIVER
LCD
REMO
GUIDE
ILL SW
OPEN
B.U.5VSW 5V
SERVO
+B
PANEL
2WAY MUTE
ACC DET.
DIMMER
TEL-MUTE
ACC
DIMMER
POWER IC
SP-OUT
MUTE
PRE-OUT (FRONT)
PRE-OUT (REAR)
MUTE PRE-OUT (NF/REAR)
MUTE
DRIVER
OP-AMP
SWITCHED
PROTECTION
THERMAL
NOISE
BUFFER
5V
B.U. DET.
SW 14
A 8V
ILLUMI
+B
EJECT ILL/DSI
(SW AND LED)
EJECT KEY
X89-252
X89-251
BACK UP
ANT-CON ANT-CON
P-CON P-CON
Q1,2
Q3,4
IC7
IC1
& N.C. MPX
IC2
Q6
IC8
Q906 S1
ED1
IC2
IC1
Q708
Q706,707
Q901-903
Q501
Q502
Q703 Q701,702
Q905
Q503,504
Q505-508
IC5
Q402 Q403,404
IC4
Q205,206
Q201-204
IC3,
(NORMAL)
DET
FLIP
LCD (NEGA)
MATRIX
KEY
G/R SW RST SW
REMO ON
BACKLIGHT
LCD
W-LED
DRIVER
LCD
REMO
ED1
IC2
IC1
X16-163
X16-167
X16-164
Q7
Q6 Q2
Q3,4
LCD NEGA
KDC-319/4019/5020
KDC-5020R/5021Y/YV
KDC-419/X459
KDC-5021/5021V/506
5x7 TYPE 14SEG TYPE
DATA C
CH-CON
DATA H
REQ H
RST
CLK
REQ C
SERVO+B
PLL DATA
PLL CLK
M STOP
M RST
MUTE L
LO/EJ
MOSW
SW2
SW3
SW1
S-METER
IFC OUT
SW 5V
3
PANEL DET GUIDE ILL
MP IN
AFS
LEVEL
RDDA
FM
AM
A 8V
B.U.5V
A 8V
3
2
2
3
8
7
SW 5V
8
SDA
SCL
AUDIO OUT
7
BACK UP
2
REMO
RESET
B.U.5V
MUTE
DRIVER
PANEL 5V
PANEL 5V
5
CD
AM+B
FM+B
S-METER
RDCK
RQUAL
B.U.5V
5
B.U.5V
FLIP DET L DATAS L CE L CLK L DATAL L-RES(L-INH) EJECT EJECT ILLUMI/DSI ILL ON
SW 5V
(E) TYPE(K,M) TYPE
CD (NORMAL)
3600mVCHANGER 3600mV
3600mV
1800mV
600mV
FM
AM
1372mV
855mV
3600mV
2
2
2
B.U.5V
8
2
2
2
QUAL
S-MUTE
REAR L/R
FRONT L/R
AFS
NOISE
N/F SW
PRE MUTE
N/F MUTE
P MUTE
MUTE
BEEP
B.U.5V
MUTE
DRIVER
P-ON
PANEL 5V
SW 5V
CH-AUX
MODE
PRE OUT OUTPUT VOLTAGE
PANEL 5V
PANEL 5V
5
DIMMER
PWM CONTROL
DIMMER
1.8V PRE
251mV (E)
470mV (K,M)
230mV
1200mV
1200mV

KDC-419/X459
3
COMPONENT DESCRIPTION
REF. FUNCTION OPERATION
No.
IC1 SYSTEM u-COM System u-com.
IC2 E-VOL/NC/MPX E-volume, Noise Chancellor, Multiplexer.
IC3 MUTE 4 inputs, 3 NOR gates.
IC4 POWER IC Power IC.
IC5 SWITCHING OP AMP Switches operation amplifier.
IC7 RDS DEMODULATOR Demodulates RDS.
IC8 RESET IC "L" when detection voltage goes below 3.0V.
IC9 EEPROM EEPROM.
Q1 FM+B SW Q1 turns on when Q2 base level goes "H".
Q2 FM+B SW Turns on when FM signal exists.
Q3 AM+B SW Q3 turns on when Q4 base level goes "H".
Q4 AM+B SW Turns on when AM signal exists.
Q6 IFC BUFFER Shapes wave form.
Q201 PRE MUTE SW (FRONT Lch) Mutes when the base level goes "H".
Q202 PRE MUTE SW (FRONT Rch) Mutes when the base level goes "H".
Q203 PRE MUTE SW (REAR Lch) Mutes when the base level goes "H".
Q204 PRE MUTE SW (REAR Rch) Mutes when the base level goes "H".
Q205 PRE MUTE SW (NON-FADER Lch) Pre mute SW.
Q206 PRE MUTE SW (REAR Rch) Pre mute SW.
Q401 E-VOL MUTE SW Mutes E-vol when the base level goes "H".
Q402 NOISE BUFFER Buffers noise.
Q403,404 AUDIO MUTE DRIVER Turns on when the base level goes "L".
Q501 BU & MOMENTARY POWER DOWN Turns on when the base level goes "H" during the back-up effects.
DETECTOR
Q502 ACC DETECTOR Turns on when the base level goes "H" during ACC effects.
Q503,504 P-ANT SW Q503 turns on when Q504 base level goes "H".
Q505 P-CON SW Q505 turns on when Q508 base level goes "H".
Q506 P-CON PROTECTOR Protects Q505 by Q506 turning on when P-CON output effect stops.
Q507 P-CON PROTECTOR Prevents Q507 turning on during being stand-by after turning power on.
Q508 P-CON SW Q505 turns on when Q508 base level goes "H".
Q510 SMALL LAMP DETECTOR Turns on when the base level goes "H" during illumination lights.
Q701,702 BU 5V AVR Turns on when the back-up effects.
Q703 SW 5V Turns on when the base level goes "L".
Q704,705 AUDIO 8V & SERVO +B AVR ON/OFF Q704 turns on when Q705 base level goes "H".
SW
Q706,707 AUDIO 8V AVR Output voltage is 8.3V.
Q708 SERVO +B AVR Output voltage is 7.4V.
Q901-903 ILLUMINATION AVR AVR output turns on when Q901 base level goes "H".
Q905 PANEL 5V SW Turns on when the base level goes "L".
Q906 GUIDE ILLUMI SW Turns on when the base level goes "L".
Q907 EJECT KEY & DSI ILLUMI SW Turns on when the base level goes "L".
ELECTRIC UNIT (X25-921x-xx)

KDC-419/X459
4
COMPONENT DESCRIPTION
REF. FUNCTION OPERATION
No.
IC1 LCD DRIVER Drives LCD.
IC2 REMOTE CONTROLLER Controls the unit.
Q1 KEY SCAN START Turns on when the base level goes "L".
Q3 KEY RED ILLUMI SW Turns on when the base level goes "H".
Q4 KEY GREEN ILLUMI SW Turns on when the base level goes "H".
Q5 VLCD AVR Turns on when the base level goes 9.1V.
Q6 IC2 POWER SUPPLY SW Turns on when the base level goes "L".
Q7 DIMMER CONTROL Controls the back light.
SWITCH UNIT (X16-164x-xx)

KDC-419/X459
5
MICROCOMPUTER'S TERMINAL DESCRIPTION
PORT PORT NAME I/O FUNCTION OPERATING CONDITION
No.
1 TYPE 0 I Destination switch. -
2 TYPE 1 I Destination switch. -
3 FLIP DET I Panel open/close detection. "H" : Panel opened. "L" : Panel closed.
4 AVSS - GND. -
5 PANEL DET I Panel presence detection. "H" : Panel does not exists. "L" : Panel exists.
6 E2P DET I EEPROM presence detection. "H" : ROM exists. "L" : ROM does not exist.
7 AVREF 1 I Reference voltage. To BU 5V.
8 CH DATA C I Data from the changer. -
9 CH DATA H O Data to the changer. -
10 CH CLK I/O Clock signal from or to the changer. -
11 L DATA L I Data from LCD driver. Max 600KHz communication speed.
12 L DATA S O Data to LCD driver. Max 1.2MHz communication speed.
13 L CLK O Clock signal to LCD driver. -
14 L CE O LCD driver enable. "H" : Driver selected. "L" : Driver non-selected.
15 BEEP O Buzzer. -
16 PLL DATA I/O Data from or to the front-end. -
17 L RST O LCD driver reset. "L" : Reset.
18 PLL CLK O Clock signal to the front-end. -
19 GUIDE ILLUMI O Guide illumination control. "L": Illumination turns on.
"H" : Illumination turns off.
20 EJECT ILLUMI/DSI O EJECT/DSI illumination control. "L" : Illumination turns on.
"H" : Illumination turns off.
21 PANEL I/O Panel power supply control. "L" : Panel exists, ACC turns off.
22 LO/EJ I/O CD-mecha/Loading/Eject switch. "L" : Loading. "H" : Eject.
23 MOSW O CD-mecha/Motor switch. "H" : Loading, eject, breaking.
24 M MUTE I Lch mute request from CD mechanism. "L" : Mute.
25 - - - -
26 M STOP O Stop request to CD mechanism. "L" : Mechanism stop. "H" : CD playing.
27 M RST O CD mechanism reset. "L" : Reset.
28 CD DOWN I CD down switch detection. "H" : Chucking.
29 ILLUMI ON O Illumination power control. "H" : Illumination turns on.
"L" : Illumination turns off.
30 IC2 TYPE 1 I IC2 destination switch. "L" : Pure KENWOOD brand. "H" : Genuine.
31 P-ON I/O SW 5V control. "L" : P-ON turns on.
32 IC2 CLK O Clock signal to IC2 or CD mechanism. -
33 VSS 1 - GND. -
34 IC2 DATA I/O Data from or to IC2 or CD mechanism. -
35 R QUAL I RDS QUAL. "L" : Model without RDS.
36 R DATA I RDS data. "L" : Model without RDS.
37 AFS O Noise detection time constant switch. "L" : FM seeking, AF searching.
"H" : Signal receiving.
38 IC2 TYPE 0 I IC2 destination switch. "L" : Pure KENWOOD brand. "H" : Genuine.
39 AM+B O AM power supply. "H" : AM signal receiving.
40 FM+B O FM power supply. "H" : FM signal receiving.
41 CH MUTE I Mute request from the changer. "H" : Mute effects.
42 CH RST O Reset signal to the changer. "H" : Reset.
43 CH REQ H O Request to the changer. "L" : Requesting.
44 CH CON O Changer control. "H" : Changer controlled.
45 DIMMER CONT O Dimmer control. "H" : Dimmer turns on.
46 MUTE O Mute. "H" : Mute effects.
47 N/F MUTE O Non-fader preout mute. "L" : Mute effects.
48 PRE MUTE I/O Front/Rear preout mute. "L" : Mute effects.
49 REMOTE I Remote control. -
(X25-) IC1 : u-COM