KENWOOD KDC-W4031, KDC-W4031Y, KDC-W409, KDC-W409Y, KDC-W431GY Service Manual

CD RECEIVER

KDC-W4031/Y

KDC-W409/Y

KDC-W431GY

KDC-W4531/Y

KDC-WF431A

SERVICE MANUAL

© 2004-12 PRINTED IN JAPAN B53-0230-00 (N) 1813

PANEL ASSY	PANEL ASSY
KDC-W4031/Y (A64-3455-02)	KDC-W409/Y (A64-3456-02)

VOL						VOL
AUD					/PTY	AUD					/PTY
SET UP						SET UP
MENU	FF	SCAN	RDM	REP	F.SEL	MENU	FF	SCAN	RDM	REP	F.SEL

PANEL ASSY						PANEL ASSY
KDC-W431GY (A64-3457-02)						KDC-W4531/Y	(A64-3454-02)
								External Media Control
VOL						VOL
AUD						AUD		/PTY
SET UP						SET UP
MENU	FF	SCAN	RDM	REP	F.SEL	MENU FF	SCAN RDM REP	F.SEL M.RDM
PANEL ASSY
KDC-WF431A (A64-3466-02)						SPARE TDF PANEL
						MAIN UNIT NAME	TDF PARTS No.	TDF NAME
						KDC-W4031/Y	Y33-2140-60	TDF-W4531
						KDC-W409/Y	Y33-2140-65	TDF-W409
AUD						KDC-W431GY	Y33-2140-61	TDF-W431GY
VOL
SET UP						/PIY	Y33-2140-60	TDF-W4531
MENU	FF	SCAN	RDM	REP	F.SEL	KDC-W4531/Y
						KDC-WF431A	Y33-2140-63	TDF-WF431

LEVER	DC CORD	PLASTIC CABINET ASSY	MOUNTING HARDWARE ASSY
(D10-4589-04) x2	(E30-6413-05)	(A02-2736-03)	(J21-9716-03)

ANTENNA ADAPTOR	* ESCUTCHEON
(T90-0523-05)	(B07-xxxx-xx)

* Depends on the model. Refer to the parts list.

This product uses Lead Free solder.

KDC-W4031/W4031Y/W409/W409Y

KDC-W431GY/W4531/W4531Y/WF431A

			BLOCK DIAGRAM
J4	L506		ELECTRIC UNIT (X34-)
	FM AGC
ANT
	AM+B
	Q501			Q351,352	J6
	AM AGC			PRE MUTE
			IC10			PRE OUT
				IC4	FM (J/K Type)	: 1800mV
					FM (E Type)	: 1372mV
	SERVO	MPX OUT			AM (J/K Type)	:	600mV
CD or MD					AM (E Type)	:	855mV
	A8V
MECHA		MPX IN			CD/MD RECEIVER : 3600mV
	BU5V			POWER IC
					CHANGER	: 3600mV
AUDIO OUT	800mV		E-VOL	IC6
	1200mV		&
				MUTE LOGIC
			TUNER
			A8V		J1
	IC11					SP OUT
			BU5V	Q51
J2	E2PROM		IC8
			RST IC	SURGE DET
CHANGER	IC7		IC1	Q52
				BU DET		BACK-UP
	RDS
				Q53
AUDIO OUT	DECODER
				ACC DET		ACC
			SYSTEM u-COM			TEL MUTE
						P-ANT
						P-CON

BACK-UP

IC3

Q151

PAN5V

BU5V

POWER SUPPLY IC

SWITCH UNIT (X16-)

PAN5

PAN5V

P-CON

ED1

Q72,73

P-ANT

IC1

SERVO

IC3

Q155

SERVO

SW5V

SW5V

VFD

REMOTE

DSI

IC15

AM+B

AM+B

A8V

AUDIO+B

VFD DRIVER

VFD REG

VCC

S11

with

KEY ILLUMI

BU5V

.......

KEY MATRIX

ILLUMI

.......

BU5V

VOL

CD PLAYER UNIT (X32-5500-00)

CN1

DOUT

24

OPEN

IC1

IC3

S2

Q1,4

4

12EJE

23

8

MP3/WMA

LEVEL

DECODER

DPU1

S1

SHIFT

16.00MHz

DATA

20

MICROPROCESSOR

X2

BUFFER

LD

LOS

22

MECHANISM

IC8

(OPTICAL PICKUP)

CLK

21

CONTROL

IC9

Q9,10

CN2

A8V

19

A8V

DAC 3.3V

A3.3V

SW

PD

AVR

1

L

18

AGND

17

R

16

Q3,5,6

BU3.3V

IC2

E

MUTER

15

3

LEVEL

MUTEL

14

SHIFT

MRST

13

RF AMP/SERVO

5

16

A B

CD SIGNAL

MSTOP

12

C

3

PROCESSOR

LEVEL SHIFT

BU 3.3V

DAC 3.3V

BU2.5V

VREF

F

Q7

IC6

IC7

X1

Q8

LOE/LIM

10

S3

AVR

AVR

16.898MHz

APC

TR COIL

BU5

9

BU5V

4

FO COIL

DGND

8

IC5

DGND

7

SW3.3V

D5

6

D5V

SW 3.3V

DM1 SPINDLE

D5

5

AVR

PON

LO/EJ

4

IC4

FCS

M

MOTOR

4

2

TRK

MOTOR

3

4ch BTL

SPD

DM2

LOADING

S7V

S7V

2

DRIVER

4

SLD

M

& SLED

SGND

1

MOTOR

2

KDC-W4031/W4031Y/W409/W409Y

KDC-W431GY/W4531/W4531Y/WF431A

COMPONENTS DESCRIPTION

● ELECTRIC UNIT (X34-3402-7x)

Ref. No.	Application / Function	Operation / Condition
IC1	SYSTEM -COM	System control.
IC3	POWER SUPPLY	DC5Vx2, 7.9Vx1, 8.1Vx1, 10.3V, P.CON, P-ANT output.
IC4	POWER IC	Audio signal amplifier.
IC6	MUTE LOGIC	Mute control.
IC7	RDS DECODER	RDS decode.
IC8	RESET	“L” when detection voltage goes below 3.6V.
IC10	E-VOL & TUNER	E-VOL, Tuner, Stereo decode.
IC11	E2PROM	Saves and writes tuner adjustment data.
IC15	VFD REGULATOR	11.3V output voltage for LED and VFD.
Q51	SERGE DET	“ON” when the base goes “H”.
Q52	BU DET	“ON” when the base goes “H”.
Q53	ACC DET	“ON” when the base goes “H”.
Q71	SERVO+B CONTROL SW	“ON” when the base goes “H”.
Q72,73	SERVO+B AVR	Output voltage level : 7.5V.
Q74	IC3 CONTROL SW	“ON” when the base goes “H” (Output voltage : 10.3V).
Q151	PANEL 5V SW	“ON” when the base goes “L”.
Q155	DSI ILLUMI SW	“ON” when the base goes “L”.
Q252	IC4 STBY SW	“ON” when the base goes “L”.
Q330	Q351, 352 MUTE DRIVER	“ON” when the base goes “L”.
Q351	Lch PRE MUTE SW	Pre-output is muted when the base goes “H”.
Q352	Rch PRE MUTE SW	Pre-output is muted when the base goes “H”.
Q501	AM RF AMP	Adjusts for AM-RF gain.

● CD PLAYER UNIT (X32-5500-00)

	Ref. No.	Application / Function	Operation / Condition
			Focusing, tracking, sled and spindle servo processing.
	IC1	MECHANISM CONTROL	Automatic adjustment (Focusing, tracking, gain, offset and balance) operations.
		MICROPROCESSOR	Digital signal processing (DSP, PLL, sub-codes, CIRC error correction, audio data
			interpolation) operations, and microcomputer function.
			Generation of RF signal based on the signals from the APC circuit and pickup, and
	IC2	RF AMP/SERVO CD	generation of servo error (Focusing error and tracking error) signals.
		SIGNAL PROCESSOR	Detection of dropout, anti-shock, track crossing and off-track conditions, included
			gain control function during CD-RW.
	IC3	MP3/WMA DECODER
	IC4	4ch BTL DRIVER	Focusing coil, tracking coil, spindle motor and sled motor driver, disc loading and
			eject operation.
	IC5	SW 3.3V AVR
	IC6	BU 3.3V AVR	3.3V power supply for back-up.
	IC7	BU 2.5V AVR	2.5V power supply for back-up.

3

KDC-W4031/W4031Y/W409/W409Y

KDC-W431GY/W4531/W4531Y/WF431A

COMPONENTS DESCRIPTION

Ref. No.	Application / Function	Operation / Condition
IC8	SELECTOR (SERIAL DATA)	Serial audio data switch.
IC9	DAC 3.3V AVR	3.3V power supply for IC2.
Q1	LEVEL SHIFT	3.3V to 5.0V.
Q3~7	LEVEL SHIFT	3.3V to 5.0V.
Q8	AUTOMATIC POWER CONTROL	LD driver.
Q9,10	SWITCH	Switch for anticipation sub-beam delay.

● SWITCH UNIT (X16-2932-7x)

Ref. No.	Application / Function	Operation / Condition
IC1	VFD DRIVER
IC3	REMOTE SENSOR
Q1	GREEN LED SW	“ON” when the base goes “H”.
Q2	RED LED SW	“ON” when the base goes “H”.
Q21	PAN SW5V	“ON” when the base goes “H”.

MICROCOMPUTER’S TERMINAL DESCRIPTION

● SYSTEM -COM : IC1 on X34- (ELECTRIC UNIT)

	Pin No.	Active	Pin Name	I/O	Application	Processing Operation
		(H/L)
	1		DC ERR	I	DC offset detection input
	2		LINE MUTE	I	Phone detection	NAVI MUTE : Over 2.5V, TEL MUTE : Below 1V
	3		ROTARY CW	I	Rotary encoder input
	4		AVSS	-
	5		TUN TYPE1	I	E-VOL setting switch	Refer to “TUN TYPE” on the TRUTH TABLE
	6		TUN TYPE2	I	E-VOL setting switch	Refer to “TUN TYPE” on the TRUTH TABLE
	7		AVREF1	-
	8		VFD DATAF	I	Data input from VFD driver
	9		VFD DATAS	O	Data output to VFD driver
	10		VFD CLK	O	Clock output to VFD driver

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KDC-W4031/W4031Y/W409/W409Y KDC-W431GY/W4531/W4531Y/WF431A

MICROCOMPUTER’S TERMINAL DESCRIPTION

	Pin No.	Active	Pin Name	I/O	Application	Processing Operation
		(H/L)
	11	L	VFD RST	O	Reset output to VFD driver	Display OFF, Key reset, TDF panel OFF : L
						Display ON, Key scan : H
	12		VFD CE	O	Chip enable output to VFD driver
	13		ROTARY CCW	I	Rotary encoder input
	14	L	TDF DET	I	TDF panel detection	TDF panel OFF : H, TDF panel ON : L
	15		PWIC BEEP	O	Beep output
	16		LX DATA S	I	Data from slave unit
	17		LX DATA M	O	Data to slave unit
	18		LX CLK	I/O	LX-BUS clock
	19		RDS AFSL	O	Tuner RDS mute output	Refer to “RDS AFSL” on the TRUTH TABLE
	20	L	TUN ADJ	I	For adjusting IC10	Adjustment=H, PS1-1,2=L, PS1-3=Hi-Z,
						PS2-1,2=Hi-Z, TUN DATA, CLK=Hi-Z
	21		TUN SD	I	Tuner search stop output	H : Station exists, L : Station does not exist
	22	H	LX RST	O	Hard reset to slave unit	H : Reset, L : Normal condition
	23	H	LX CON	O	Start-up request to slave unit	H : Slave unit ON, L : Slave unit OFF
	24		LX REQ M	O	Communication request to slave unit
	25		AUD SDA	I/O	Volume + tuner I2C data input and output
	26		AUD SCL	I/O	Volume + tuner I2C clock input and output
	27	H	PWIC STBY	O	Power IC standby output	Power IC ON : H, Power IC OFF : L
	28	H	VOL MUTE	O	E-VOL mute output	L : Mute OFF, Hi-Z : Mute ON
	29	L	PWIC MUTE	O	Power IC mute output	Power OFF : L, Standby : L, Tel mute : L
	30		TUN FANC OUT	O	Tuner block (inside the -com) check	OK : L, NG : H
	31		RESET2	O	Mute for reset	Output L
	32		RDS DATA	I	RDS decoder data input
	33		VSS1	-
	34		RDS QUAL	I	RDS decoder QUAL input
	35	L	ACC DET	I	ACC detection	ACC exists : L, ACC does not exist : H
	36	L	BU DET	I	Momentary power-down detection	BU exists : L
						BU does not exist (Momentary power-down) : H
	37		NC	-
	38		PS2-2	O	Power supply control output	Refer to “POWER IC CONTROL” on the TRUTH TABLE
	39		PS2-1	O	Power supply control output	Refer to “POWER IC CONTROL” on the TRUTH TABLE
	40		PS1-1	O	Power supply control output	Refer to “POWER IC CONTROL” on the TRUTH TABLE
	41		PS1-2	O	Power supply control output	Refer to “POWER IC CONTROL” on the TRUTH TABLE
	42		PS1-3	O	Power supply control output	Refer to “POWER IC CONTROL” on the TRUTH TABLE
	43,44		NC	-
	45		CD MUTE	I	CD mute request	L : Mute request
	46	L	CD MSTOP	O	CD mecha u-com stop	H : mecha -com operates, L : mecha -com is stopped
	47		CD LOE LIM SW	I	CD detection (chucking switch)	H : Loading is finished, L : Disc does not exist

5

KDC-W4031/W4031Y/W409/W409Y KDC-W431GY/W4531/W4531Y/WF431A

MICROCOMPUTER’S TERMINAL DESCRIPTION

	Pin No.	Active	Pin Name	I/O	Application	Processing Operation
		(H/L)
	48		CD LOEJ	I/O	CD motor control	Refer to “CD MECHA CONTROL OPERATION”
						on the TRUTH TABLE
	49		CD MOTOR	O	CD motor control	Refer to “CD MECHA CONTROL OPERATION”
						on the TRUTH TABLE
	50		NC	-
	51	L	CD MRST	O	CD mecha -com reset	H : Normal condition, L : Reset
	52		CD SCL	I/O	CD mecha I2C clock output
	53		CD DISC12 SW	I	12cm CD detection
	54		CD LOS SW	I	CD loading detection
	55		CD SDA	I/O	CD mecha I2C data input and output
	56		OEM DISP CE	I/O	External display chip enable	External display
	57		OEM DISP CLK	I/O	External display clock	External display
	58		OEM DISP DATA	I/O	External display chip data	External display
	59		DSI	O	DSI control	DSI ON : H, DSI OFF : L, TDF DET=H (DSI blinks)
	60	L	RESET	I
	61		NC	-
	62	L	PON FL	O	VFD power supply ON	VFD ON : H, VFD OFF : L
						TDF DET H (DSI blinks) : L, TDF DET L : H
	63		KEY REQ	I	Communication request from VFD driver	L : Key input
	64		RDS CLK	I	RDS decoder clock input
	65		REMOTE	I	Remote control input
	66		LX REQ S	I	Communication request from slave unit
	67		VSS0	-
	68		VDD1	-
	69		X2	-
	70		X1	-
	71		TEST	-
	72		XT2	-
	73		XT1	-
	74		VDD0	-
	75		AVDD	-
	76~78		TYPE 3~TYPE 1	I	Destination switch
	79		RDS NOISE	I	Tuner quality (Noise) input
	80		TUN SMETER	I	Tuner S-meter input

6

KDC-W4031/W4031Y/W409/W409Y KDC-W431GY/W4531/W4531Y/WF431A

MICROCOMPUTER’S TERMINAL DESCRIPTION

● TRUTH TABLE

• TUN TYPE

TYPE 1 TYPE 2

General models commercially-designated as pure KENWOOD brand (Initial value)

L L

Initial value setting

• RDS AFSL (AF search)

Normal condition communication (IC10 side : High)

High

(Quality time constant long / Stereo Decoder PLL : Not hold)

AF search (IC10 side : Middle)

Low

(Quality time constant short / Stereo Decoder PLL : Hold)

• POWER SUPPLY IC (IC3) CONTROL

SEL1 (Pin No. 11)

PS1-2	PS1-3	PS2-1	ILLUMI	P-CON	P-ANT
L	L	L	OFF	OFF	OFF
L	L	H	ON	OFF	OFF
H	L	H	ON	ON	OFF
H	H	H	ON	ON	ON
SEL2 (Pin No. 12)
PS1-1	PS2-2	AUDIO	SW5	AM
L	L	OFF	OFF	OFF
H	L	ON	ON	OFF
H	H	ON	ON	ON

• CD MECHA CONTROL OPERATION

CD LOEJ	CD MOTOR	CD MECHA OPERATION
L	H	Load
H	H	Eject
Hi-Z	L	Stop
Hi-Z	H	Brake

7

KDC-W4031/W4031Y/W409/W409Y KDC-W431GY/W4531/W4531Y/WF431A

MICROCOMPUTER’S TERMINAL DESCRIPTION

● CD MECHANISM -COM : IC1 on X32- (CD PLAYER UNIT)

	Pin No.	Active	Pin Name	I/O	Application	Processing Operation
		(H/L)
	1		VREFL	-	Reference power supply input terminal for ADC (L).	GND
	2		AVSS	-	GND terminal for ADC.	GND
	3		AVCC	-	Power supply terminal for ADC.	Back-up 3.3V
	4		NC	-
	5	L	20RST	O	Reset control (Decoder).	L : Reset, H : Normal condition
	6		20ACK	I	Acknowledge signal input (Decoder).
	7		20STBY	O	Standby control (Decoder).	H : Standby, L : Normal condition
	8,9		NC	-
	10		20INT	I	Interrupt signal input (Decoder).
	11		FOGUP	I	Focus gain-up interrupt.	H : Focus gain-up, L : Normal condition
	12		LZM	I	0 bit mute detection (Lch).	L : MUTE OFF, H : MUTE ON
	13		RZM	I	0 bit mute detection (Rch).	L : MUTE OFF, H : MUTE ON
	14,15		NC	-
	16	L	20CS	O	Chip select signal output (Decoder).
	17	L	20LP	O	Latch pulse signal output (Decoder).
	18		20TXD0	I/O	Data output for serial data (Decoder).	Input condition is kept except in output condition.
	19		20RXD0	I	Data input for serial data (Decoder).
	20		20SCLK0	O	Clock output for serial data (Decoder).
	21		DSPTXD1	O	Data output for serial data (DSP).
	22		DSPRXD1	I	Data input for serial data (DSP).
	23		DSPSCLK1	O	Clock output for serial data (DSP).
	24		AM0	-	ROM mode selection terminal.	H : Normal condition, L : External ROM mode
	25		DVCC	-	Back-up 3.3V.
	26		X2	O	Resonator terminal.	16MHz
	27		DVSS	-	GND.
	28		X1	I	Resonator terminal.	16MHz
	29		AM1	I	“H” condition is fixed.	Back-up 3.3V
	30	L	RESET	I	Reset detection.	L : Reset, H : Normal condition
	31~34		NC	-
	35	L	DSPSTB	O	Data strobe signal output (DSP).
	36		DSPA0	O	Command/Parameter identification signal output	H : Parameter data output,
					(DSP).	L : Command data output
	37	L	DSPRST	O	Reset control (DSP).
	38		DSPINT	I	Interrupt signal input (DSP).	H : Interrupt
	39		NC	-
	40		SEARCH	O	Search condition output.	H : Search, L : Normal condition
	41		LOE/LIM SW	I	Loading-end detection/Pick-up inner circumference detection	H : Inner circumference
	42~49		NC	-

8

KDC-W4031/W4031Y/W409/W409Y KDC-W431GY/W4531/W4531Y/WF431A

MICROCOMPUTER’S TERMINAL DESCRIPTION

	Pin No.	Active	Pin Name	I/O	Application	Processing Operation
		(H/L)
	50		FLAGIN	I	C2Err impossibility detection.	L : Correction is possible.
						H : Correction is impossible.
	51~61		NC	-
	62		DVSS	-	GND.
	63	L	NMI	I	Non-maskable interrupt request.
	64		DVCC	-	Power supply terminal.
	65~77		NC	-
	78		NC/BOOT	I	Mask : Not connected. Flash : For writing (Active “L”). L : Write, H : Nomal condition
	79,80		NC	-
	81		POND3.3	O	Digital 3.3V power-on control terminal.	H : POWER ON
	82	L	MUTEL	O	Lch audio mute control.
	83	L	MUTER	O	Rch audio mute control.
	84		SDA	I/O	I2C data (Main -com).
	85		SCL	I/O	I2C clock (Main -com).
	86	L	MSTOP	I	Stand-by comeback interrupt.	L : Stop, H : Stop is released.
	87		NC	-
	88	L	DMUTE	O	Driver mute.	L : MUTE ON, H : MUTE OFF
	89		DVCC	-	Power supply terminal.
	90		NC	-
	91		DVSS	-	GND.
	92,93		NC	-	GND.
	94		MSEL	I	Memory capacity switching terminal.	H : Capacity size down, L : Capacity size up
	95		NC	-	GND.
	96		ASEL	I	Audio output polarity switch.	H : Reverse output, L : Non-reverse output
	97		CHSEL	I	Changer destination terminal.	H : Changer, L : Other source
	98		SEL0	I	-com destination terminal 0.
	99		SEL1	I	-com destination terminal 1.
	100		VREFH	I	Reference power supply input terminal for ADC (H).	Back-up 3.3V

9

KDC-W4031/W4031Y/W409/W409Y KDC-W431GY/W4531/W4531Y/WF431A

TEST MODE

How to enter the test mode

While simultaneously press PRESET “1” key and PRESET “3” key, press “RESET” button.

How to release the test mode

Press “RESET” button. (The release cannot be achieved in the conditions of POWER OFF and ACC OFF.)

Initial conditions of the test mode

•The source is “STANDBY”.

•The displays all lit up.

•The volume is at –10dB (The display shows “30”.)

•LOUD is “OFF”.

•CRSC is “OFF”.

•SYSTEM Q is “NATURAL”.

•BEEP is sounded at all time with the key depressed for less than 1 second.

Special displays when all indicator lights are lighted

When “PRESET” keys are pressed while all indicators for the

STANDBY sources are lighted, the following displays will ap-

pear.

PRESET	• Version display (8 digits : month, date, hour, minute)
“1” key	(Display) : x x x x x x x x
PRESET	• Serial number display (8 digits)
“2” key	(Display) : x x x x x x x x
PRESET	• When pressed for less than 1 second : POWER ON
“3” key	time display (STANDBY source time is not counted.)
	(Display) : PON x x x x x	MAX 60,000 (hours)
	* The display is cleared by pressing the key for more
	than 2 seconds.
PRESET	• When pressed for less than 1 second : CD operation
“4” key	time display
	(Display) : PLY x x x x x	MAX 60,000 (hours)
	* The display is cleared by pressing the key for more
	than 2 seconds.

PRESET	• When pressed for less than 1 second : CD EJECT
“5” key	number display
	(Display) : EJC x x x x x	MAX 60,000 (times)
	* The display is cleared by pressing the key for more
	than 2 seconds.
PRESET	• When pressed for less than 1 second : Panel open/
“6” key	close number display
	(Display) : PNL x x x x x	MAX 600,000 (times)
	* The display is cleared by pressing the key for more
	than 2 seconds.
“FM”	• ROM CORRECTION version display
key	(Display)
	Effective : ROM _ Rxxx (x : number)
	Not effective (When not able to read) : ROM _ R – – –
	Not effective (When version is different) : ROM _ R
“AM”	• IC10 adjustment status (Refer to “ADJUSTMENT” on
key	the following page.)
	(Display)
	Adjustment complete : E2P _ OK _ _
	Adjustment not completed : E2P _ ER _ _
	Communication error : I2C _ ER _ _
	* When other than “E2P _ OK _ _” , Pin No. 30 will
	become “H”.
“ ”	• Mechanism error detection status
key	• Communication error →	Error No. 1 → Error No. 2 →
	Error No. 3 → Communication error (Error No. 1 is the
	most recent error.)
	(Display)
	Communication OK : I2C _ OK _ _
	Communication error : I2C _ NG _ _
	Not detected : ERR _ n – – – (n : 1~3)
	Detected : ERR _ n- ( : error code)
	* The display is cleared by pressing the key for more
	than 2 seconds.

10