Kenwood KDC-3027-A, KDC-3027-G, KDC-3027-AY, KDC-3027-GY, KDC-4027 Service manual

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CD RECEIVER

KDC-2027SA/SAY/SG/SGY KDC-3027A/AY/G/GY KDC-308A/AY/G/GY KDC-4027/V/VY/Y KDC-F327A/G

SERVICE MANUAL

CD mechanism extension cord (22PIN) : W05-0618-00

	Panel assy				Front glass
	KDC-2027SA/SAY/SG/SGY (A64-3168-02)				KDC-2027SA/SAY/SG/SGY (B10-4462-01)
									MONO
	UD
	LO
		AUD	OFF		SCAN	RDM	REP		CLK	ADJ
					SCAN	RDM	REP		CLK	ADJ
	AME	AUTO
	Panel assy				Front glass
	KDC-3027A//AY/G/GY (A64-3166-02)				KDC-3027A/AY/G/GY (B10-4460-01)
	KDC-308A/AY/G/GY (A64-3167-02)				KDC-308A/AY/G/GY (B10-4461-01)
	KDC-F327A/G		(A64-3169-02)		KDC-F327A/G			(B10-4463-01)
									PTY
	UD
	LO
		AUD	OFF		SCAN	RDM	REP		CLK	MENU
		VOL			SCAN	RDM	REP		CLK	MENU
	TI	VOL
	TI	AUTO
	Panel assy			Front glass
	KDC-4027/V/VY/Y (A64-3165-02)			KDC-4027/V/VY/Y (B10-4459-01)
					EXTERNAL MEDIA CONTROL			-	PTY +
					EXTERNAL MEDIA CONTROL			-
	UD
	LO
		AUD	OFF	SCRL	SCAN	RDM	REP		M.RDM CLK	MENU
		VOL		SCRL	SCAN	RDM	REP		M.RDM CLK	MENU
	TI	VOL
	TI	AUTO
DC cord	Mounting hardware assy			Antenna adaptor				Lever		Escutcheon
(E30-6132-05)	(J21-9716-03)			(T90-0523-05)				(D10-4589-04) x 2		(B07-3001-02)
(E30-6286-05)

	TDF PANEL INFORMATION
Plastic cabinet assy	MODEL	PARTS NO. PANEL NAME
(A02-1486-13)	KDC-2027SA/SAY	Y33-1960-64 TDF-2027SA
	KDC-2027SG/SGY	Y33-1960-65 TDF-2027SG
	KDC-3027A/AY/G/GY	Y33-1960-62 TDF-3027
	KDC-308A/AY/G/GY	Y33-1960-63 TDF-308
	KDC-4027/Y	Y33-1960-60	TDF-4027
	KDC-4027V/VY	Y33-1960-61	TDF-4027V
	KDC-F327A/G	Y33-1960-66	TDF-F327

CD PLAYER UNIT (X32-5490-00)
			BU5V				IC2	SW3.3V
BU5V	15		BU5V				3.3V AVR	SW3.3V
DGND	14						3.3V AVR
DGND	14
				Q2			CNTL
CLK	19			Q2			SW5V
CLK	19
DATA	18			5V SW
DATA	18
MUTER 13
MUTER 13
MUTEL 12			IC1
MRST	11	S1(LOS SW)	IC1
MRST	11
MSTOP	10		CLK DATA MUTER	MUTEL MRST MSTOP	PON	SERCH
MSTOP	10							IC3
LOS SW 20							PON


		S2(12EJE SW)					INTQ	INTQ
		S2(12EJE SW)		MECHANISM			SI	SO
							SI	SO

12EJE SW 21				CONTROL IC	DSP RESET			RST
			LOE & LIM				AO	AO
			LOE & LIM
		S3	SW				STB	STB
		S3					SCK	SCK
		(LOE & LIM SW)		L R			SCK	SCK
		(LOE & LIM SW)		L R			SO	SI
LOE&LIM				MUTE MUTE			SO	SI
LOE&LIM	1			MUTE MUTE				FD+
SW	1					DRV MUTE		FD+
SW						DRV MUTE		TD+
				Z Z				TD+
		S4(8EJE SW)		Z Z				SD+
								SD+
								MD+
								MD+

8EJE SW 17			X1
8EJE SW 17
A8V	9	OPEN	4.19MHz
			4.19MHz
DOUT	22

APC

LD	PD	F
		F
		A
		B
CD RF/SERVO/		C
CD RF/SERVO/		D
DSP/DAC IC		D
DSP/DAC IC		E
		E
LZM RZM TX LOUT OUTR	PRE OUT
	PRE OUT
	X2
	16.934MHz

DPU1 :

OPTICAL PICKUP

LD
PD
Q4
SW	F
A	B
	C
	E
VREF

TR COIL

Lch	8
AGND	7
Rch	6
S7.5V	3
SGND	2
MOTOR	4
LO/EJ	5
NC 16

LPF

S7.5V

OPEN

IC4
	MUTE	FDINTDINSLIN+ SPIN-
CNT	4ch BTL
CNT	DRIVER
LO/EJ	DRIVER
LO/EJ

BIAS

TR+

TR-

FO+

FO-

SPD+ SPDSLD+ SLD-

	FO COIL
	DM1	SPINDLE
	M	SPINDLE
	M	MOTOR
	DM2	LOADING
		LOADING

M& SLED MOTOR

3027A/AY/G/GY 2027SA/SAY/SG/SGY,-KDC F327A/G 4027/V/VY/Y, 308A/AY/G/GY,-KDC DIAGRAM BLOCK

ELECTRIC UNIT (X34- )
	FM+B
	Q502
ANT	FM AGC
	AM+B
	Q501
	AM AGC
	CD
	AUDIO OUT
	12EJE
	LO/S
	SCLK
	SDA
	8EJE
	MUTE
	RST
	STOP
	LO/EJ
	MO
	LOE/LIM

SERVO A8V BU5V

1200mV 1200mV

	A8V
IC10
FM AGC OUT
AM AGC OUT
	TUNER,MPX &
	E-VOL.
	OUT
CH	TUNER
CD

IC6

RDS

DECODER

IC1

IC12
	EEP-ROM
BU5V	IC11
BU5V
	RESET
	IC

CHANGER AUDIO OUT

RST

REQ C

CLK

DATA H

CH-CON

REQ H

DATA C

MUTE

MI-COM

BACK UP

	BU5V	SW5V
		IC2
LCD	LCD DRIVER	REMOCON
LCD

	WITH
	KEY MATRIX

SWITCH UNIT (X16- )

	FM(J,K) : 1800mV
Q223,224	FM(E) : 1372mV
Q223,224	AM(J,K) : 600mV	CD : 3600mV
PRE	AM(J,K) : 600mV	CD : 3600mV
	AM(E) : 855mV	CH : 3600mV

MUTE	IC4
	IC4

IC8

MUTE

LOGIC

Q10

DET

Q20

ACC

DET

Q51,55

SERVO	SERVO
SERVO
	Q50
SW5V	SW5V
SW5V

KEYILLUMI

BACKLIGHT

POWER IC

MUTE

IC7

	POWER
	SUPPLY IC
	P-CON
	P-ANT
	VCC
	SW1
	SW2
	BU5V
BU5V	FM+B
FM+B	FM+B
AM+B	AM+B
A8V	AUDIO+B
	ILLUMI

PRE

OUT

BACK UP

ACC

P-CON P-ANT

3027A/AY/G/GY 2027SA/SAY/SG/SGY,-KDC F327A/G 4027/V/VY/Y, 308A/AY/G/GY,-KDC DIAGRAM BLOCK

KDC-2027SA/SAY/SG/SGY, 3027A/AY/G/GY

KDC-308A/AY/G/GY, 4027/V/VY/Y, F327A/G

COMPONENTS DESCRIPTION

● SWITCH UNIT (X16-2462-7x/2472-7x)

Ref No.	Application/Functions	Operation/Condition/Compatibility

IC1	LCD driver	LCD derive & Key input interface

IC2	Sensor	Remote control sensor

Q1	Key scan detect	key scan start at base gose “L”.

Q2	LED SW	When Q2 base gose “H” LED is light on RED Color

Q3	LED SW	When Q2 base gose “H” LED is light on GREEN Color

● CD PLAYER UNIT (X32-5490-00)

Ref No.	Application/Functions	Operation/Condition/Compatibility

IC1	Mechanism control	When BU5V & MSTOP (12pin) goes “H” (IC1 is active)

IC2	SW3.3V AVR	When CNTL (1pin) goes “H” (SW3.3V AVR : ON)

IC3	CD DSP & servo IC	CD RF amp, Servo, DSP & DAC

IC4	BTL driver	Focus, tracking coil, Sled & Spindle motor driver IC

Q2	SW	SW5V SW transistor

Q3	APC	Auto Power Control

Q4	SW	EQ SW transistor

● ELECTRIC UNIT (X34-3102-7x)

Ref No.	Application/Functions	Operation/Condition/Compatibility

IC1	System control IC	System control microprocessor

IC4	Audio power IC	Audio power amplifier

IC6	RDS decoder	RDS decoder IC

IC7	Power supply IC	Multi AVR IC (for 5V, 8V, P-CON & P-ANT)

IC8	Muting logic IC	Control for MUTE, P-ANT & RESET muting

IC10	E-VOL & tuner IC	E-VOL. FM/AM tuner & stereo decoder

IC11	Reset IC	When BU5V line voltage is less than 3.5V, this IC output line is “L”

IC12	E2PROM	Memorized tuner adjustment data (save & load)

Q10	BU detector	When the base goes “H” during BU applied (ON)

Q20	ACC detector	When the base goes “H” during ACC applied (ON)

Q40	Muting driver foe Q223, 224	When the base goes “L” (Muting : ON)

Q50	SW5V	When the base goes “L” (SW5V : ON)

Q51	SW	Control SW for IC7

Q55	SERVO +B AVR	Servo AVR (7.4V)

Q70	Serge detector	When the base goes “H” (Serge detection)

Q101	DSI illumination SW	When the base goes “L” (DSI illumination : ON)

Q102	Panel 5V SW	When the base goes “L” (Panel 5V : ON)

Q201	Noise buffer	Tuner audio noise buffer amplifier

Q223,224	Preout muting SW	When the base goes “H” (Preout muting : ON)

Q251	SW	When the base goes “L” (IC4 : ON)

Q252	Smeter RC & MPTHTC SW	RC & TC is “LONG” when the base is “H” (base is “L” is AF search)

Q253	Smeter RC & MPTHTC SW	When collector is “H”, emitter is “H”

Q501	AM RF amplifier	When the base goes “H” (RF circuit gain is up)

Q502	FM RF amplifier	When the base goes “H” (RF circuit gain is up)

Q503	MPX buffer	MPX input buffer with RDS

KDC-2027SA/SAY/SG/SGY, 3027A/AY/G/GY

KDC-308A/AY/G/GY, 4027/V/VY/Y, F327A/G

MICROCOMPUTER’S TERMINAL DESCRIPTION

● SYSTEM MICROCOMPUTER : UPD780058GC55x (X34 : IC1)

Pin No.	Name	I/O	Description	Processing Operation

1	PANEL	I	Panel detection	H : Panel detached, L : Panel attached

2	8EJE SW	I		H : Eject is completed
2	8EJE SW	I		Except 8cm CD model : Always output L
				Except 8cm CD model : Always output L

3	NC	O	Not used (out put L)

4	Avss

				H : Panel detached, L : RESET
5	L-RST	O	LCD driver RESET	Normal H, Power off L
				When 7seg model, output L

6	L-CE	O	LCD driver selection	H : Select (panel communication)
6	L-CE	O	LCD driver selection	When panel attached, output L
				When panel attached, output L

7	AVREF1

8	NC		Not used (connected to 9pin)

9	IC10-DATA	I/O	IC10, E2PROM data communication	Non communication : H

10	IC10-CLK	O	IC10, E2PROM clock communication	Non communication : H

				Non communication : H
11	L-DATAL	I	Data input from the LCD driver	When panel detached : L
				Pull down on X34 unit, Pull up on X16 unit

12	L-DATAS	O	Data output to the LCD driver	When panel detached, output L

13	L-CLK	O	Clock output to the LCD driver	When panel detached, output L

14	R-DATA	I	Data input from the RDS	Except RDS model : Output L

15	R-QUAL	I	Quality input from the RDS	Except RDS model : Output L

16	CH-DATAC	I	Data input from the changer (new 5L)	Except changer model : Output L

17	CH-DATAH	O	Data output to the changer (new 5L)	When non communication, last data keeping
17	CH-DATAH	O	Data output to the changer (new 5L)	Except changer model : Output L
				Except changer model : Output L

18	CH-CLK	I/O	Clock input/output with the Changer (new 5L)	Check the old and new
18	CH-CLK	I/O	Clock input/output with the Changer (new 5L)	Except changer model : Output L
				Except changer model : Output L

19	CH-REQH	O	Request output to the changer (new 5L)	L : Requset
19	CH-REQH	O	Request output to the changer (new 5L)	Except changer model : Output L
				Except changer model : Output L

20	NC	O	Not used (output L)

21	AFS	O	Noise detection time constant switching terminal	H : Normal, L : FM/AM seek and AF search
21	AFS	O	Noise detection time constant switching terminal	(When tuner SRC auto zero, L)
				(When tuner SRC auto zero, L)

22~24	NC	O	Not used (output L)

25	CH-CONT	O	Changer control	H : Changer on, L : Changer off
25	CH-CONT	O	Changer control	Except changer model : Output L
				Except changer model : Output L

26	TYPE REF	O	5V lines output for destination setting	H : During destination reading

27	SD	I	Tuner SD input	H : Station detected

28	NC	O	Not used (output L)

29	TYPE2	I	Destination type selection terminal 2	Refer to destination type list.

30	TYPE1	I	Destination type selection terminal 1	Refer to destination type list.

KDC-2027SA/SAY/SG/SGY, 3027A/AY/G/GY

KDC-308A/AY/G/GY, 4027/V/VY/Y, F327A/G

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No.

Name

I/O

Description

Processing Operation

TYPE0

Destination type selection terminal 0

Refer to destination type list.

TUNER-TYPE1

Destination available/genuine model rool off

H : Genuine model 1, L : Available model

Vss1

TUNER-TYPE0

Destination available/genuine model noise cancel

H : Genuine model 0, L : Available model

MUTE

Mute (E.Vol, Preset) control

H : Mute on, L : Mute off

Power off after that 15 second L

M-DATA

I/O

Data input/output with the CD mechanism

Non communication : H

M-CLK

Clock output to the CD mechanism

Non communication : H

When adjustment = H

ADJ

Tuner lines adjustment

PS1-0, 1=L PS1-2, 2-0, 1=Hi-z

IC10-DATA, CLK=Hi-z

P-MUTE

Power IC mute control

H : Mute off, L : Mute on

Power off after that 15 second H

SVR

Power IC servo control

H : When momentary power down detected

L : Nomal

P-STBY

Power IC standby control

H : Power IC ON, L : Power IC OFF

SW5V

SW 5V control

H : SW5V OFF, L : SW5V ON

Power off after that 10 second H

B.U-DET

Back up detection terminal

H : Power down, L : B.U. on

ACC-DET

ACC detection terminal

H : ACC OFF, L : ACC ON

PS1-0

Power supply IC SW1 control 0

BA4911 SW1

Power supply IC output

Audio 8V, P-CON

PS1-2

PS1-1

PS1-0

A8V

P-CON

P-ANT

STANDBY

PS1-1

Power supply IC SW1 control 1

L (H)

H (L)

OFF

Audio 8V, P-CON

OFF

PS1-2

Power supply IC SW1 control 2 P-ANT

Power supply IC SW2 control 0

PS2-0

BA4911 SW2

Power supply IC output

ILLUMI, FM, AM

PS2-1

PS2-0

ILLUMI

STANDBY

Power supply IC SW2 control 1

PS2-1

L (H)

H (L)

OFF

ILLUMI, FM, AM

OFF

BEEP

H : Light on, L : Light off

DSI

DSI control

When panel attached, output L

When panel detached, flashing at the panel (H/L)

FIX model is output L

Not used (out put L)

KDC-2027SA/SAY/SG/SGY, 3027A/AY/G/GY

KDC-308A/AY/G/GY, 4027/V/VY/Y, F327A/G

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No.	Name	I/O	Description	Processing Operation

54	LOE/LIM SW	I	CD mechanism down&limit detection	H : Chucking detection, L : Normal

55	MO SW	O	CD mechanism loading motor control output	H : Loading, Eject, Break, L : Play

56	LO/EJ	I/O	CD mechanism loading/Eject switching terminal	H : Eject, L : Loading

57	M-STOP	O	Stop output to the CD mechanism	H : Play, L : Stop

58	M-RST	O	Reset output to the CD mechanism	H : Normal, L : CD mechanism reset

59	M-MUTE	I	Mute input from the CD mechanism	H : Mute off, L : Mute on

60	RESET		Reset input from the System microcomputer

61	REMO	I	Remote control input

62	R-CLK	I	RDS clock input	Except RDS model : Output L

				H : Changer detection
63	CH-REQC	I	Request input from the changer (new 5L)	L : Request
				Except Changer model : Output L

64	LOS SW	I	CD mechanism loading's switch detected	H : No disc
64	LOS SW	I	CD mechanism loading's switch detected	L : Disk in (Loading Start)
				L : Disk in (Loading Start)

65	KEY-REQ	I	Key input detected	H : Key no input
65	KEY-REQ	I	(11pin L connected to the DATA L)	L : Key input (edge key data reading start)
			(11pin L connected to the DATA L)	L : Key input (edge key data reading start)

66	12EJE SW	I	12cm disc detected	L : 12cm disc

67	Vss0

68	VDD1

69	X2		MAIN X’tal oscillating circuit	4.19MHz X’tal connection

70	X1		MAIN X’tal oscillating circuit	4.19MHz X’tal connection

71	IC		TEST

72	XT2		Not used	OPEN

73	XT1

74	VDD0		VDD	Connected to VDD

75	AVREF0		A/D converter reference voltage control output,
75	AVREF0		connection to the 80pin AVCONT
			connection to the 80pin AVCONT

76	S-METER	I	S-meter input

77	NOISE	I	FM noise detection input

				2.5V or greater : NAVI MUTE
78	PHONE	I	2 way mute	1.0V or less : TEL MUTE
				Except phone mute model : Output L

79	NC	O	Not used (out put L)

80	AVCONT	O	A/D converter standard voltage control output	H : During A/D converter active
80	AVCONT	O	A/D converter standard voltage control output	same timing with PON
				same timing with PON

KDC-2027SA/SAY/SG/SGY, 3027A/AY/G/GY

KDC-308A/AY/G/GY, 4027/V/VY/Y, F327A/G

MICROCOMPUTER’S TERMINAL DESCRIPTION

● CD MECHANISM CONTROL IC : 789166YGB-A513 (X32 : IC1)

Pin No.	Name	I/O	Description	Processing Operation

1~6	NC	I	NC	GND

7	ZMUTE_L	I	0 bit MUTE detect (Lch)	Less than 54h : NORMAL,
7	ZMUTE_L	I	0 bit MUTE detect (Lch)	More than 54h : ZMUTE detect
				More than 54h : ZMUTE detect

8	ZMUTE_R	I	0 bit MUTE detect (Rch)	Less than 54h : NORMAL,
8	ZMUTE_R	I	0 bit MUTE detect (Rch)	More than 54h : ZMUTE detect
				More than 54h : ZMUTE detect

9	AVss	-	DGND

10	/MUTE_L	O	Lch Audio mute control	L : MUTE ON, H : MUTE OFF

11	/MUTE_R	O	Rch Audio mute control	L : MUTE ON, H : MUTE OFF

12	/MSTOP	I	Interruption for stand-by	L : STOP, H : Release for STOP mode

13	INTQ	I	Interruption for DSP IC	H : Interruption

14	/FOGUP	I	Interruption for focus gain up	L : Fo GAIN UP, H : NORMAL

15	PON	O	Power ON/OFF control	H : ON, L : OFF

16	/SCK	O	(for DSP) serial data clock output

17	Vdd1	-	BU5V

18	SO	O	(for DSP) serial data output

19	SI	I	(for DSP) serial data input

20	/CLK	I/O	(for system control) I2C clock

21	DATA	I/O	(for system control) I2C data

22	Vpp	-	(FLASH saving terminal)

23	XT2	-	NC	OPEN

24	XT1	I	NC	GND

25	/MRESET	I	Reset detect	L : RESET, H : NORMAL

26	X2	-	System clock	4.19MHz

27	X1	I	System clock	4.19MHz

28	Vss0	-	DGND

29	Vdd0	-	BU5V

30	LOE&LIM_SW	I	Loading end & limit SW detect	L : Inside detect, H : Outside

31	DRV_MUTE	O	Driver muting	L : MUTE ON, H : MUTE OFF

32,33	NC	O	NC	OPEN

34	/SERCH	O	Condition of serch state	L : Search, H : NORMAL

35	/STB	O	Data strobe signal output

36	A0	O	Command & parameter signal output

37	Vss1	-	DGND

38	/DSP_RESET	O	DSP reset control	L : RESET, H : NORMAL

39~41	NC	O	NC	OPEN

42	/PON	O	Power ON/OFF control	L : ON, H : OFF

43	Avdd	-	BU5V

44	Avref	-	BU5V

KDC-2027SA/SAY/SG/SGY, 3027A/AY/G/GY KDC-308A/AY/G/GY, 4027/V/VY/Y, F327A/G

TEST MODE

1. How to enter test mode

While holding the FM key and preset 6 key and reset the unit. All display segments light up when the test mode is entered.

2. How to exit from test mode

Reset the unit.

Turning ACC off, power off, momentary power down or panel detaching does not terminate the test mode.

3. Test mode specifications of CD receiver

•Pressing the Track Up key skip to tracks in the following sequence:

No.9 → No.15 → No.10 → No.11 → No.12 → No.13 → No.14

→No.9 (repeats the cycle)

•Pressing the Track Down key skip to the track immediately before the track being played.

•Pressing Preset 1 key skip to track No. 28.

•Forced ejection is not provided.

4. Audio functions

•Pressing the AUDIO key or the “*” key on the remote controller initiates the Audio adjustment mode.

•In the Audio adjustment mode, the Seek Up/Down keys on the remote controller can only be pressed shortly. (They cannot be held depressed.)

•The volume is -10dB (which is displayed as “30”).

•LOUDNESS is OFF.

•The Bass/Treble Up/Down and Balance/Fader Up/Down buttons function as full-boost/full-cut and full-front/full-rear respectively.

5. Menu mode (for 14segment model)

•Pressing the CLK or the DNPP key on the remote controller initiates the Menu mode.

•In the Menu mode, the Seek Up/Down keys on the remote controller can only be pressed shortly. (They cannot be held depressed.)

•With the models incorporating RDS, the first operation in the menu becomes local seek.

6. Version and operating hours display

• The following table shows the key operations and resulting display information.

Key Operation	Display

Pressing Preset 1	Version (Date and time display)

Pressing Preset 2	All display segments light up

Pressing Preset 3	CD operating hours

Pressing Preset 4	E2PROM (Adjustment data for IC10)

Pressing Preset 5	CD ejection count

Pressing Preset 6	Number of times adjustment for IC10

•Holding Preset 3 while the operating hour information is displayed clears it.

•Holding Preset 5 while the ejection count information is displayed clears it.

Adjustment Mode

• Adjustable items
1	: Stereo Decoder	Sub address : 9
2 : Configuration		Sub address : D
3	: Stereo decoder Adjustment	Sub address : E
4	: Hi-Cut	Sub address : C
5	: Field strength control	Sub address : B

•Default values

If they are not written in the EEPROM, the default values specified are set in IC10.

Adjustment procedure

1.Enter the IC10 Adjustment mode by resetting the unit while holding preset 3 key + preset 6 key.

2.Select the TUNER source by pressing SRC.

3.When the adjustment mode is entered, the display shows 2-digit hex number.

4.When preset 1~5 is recalled, the setting values corresponding to the pressed number are displayed. (The displayed values are those in the RAM.)

5.Vary each setting value using and key.

6.Store the values in the corresponding preset number.

7.The settings can be performed individually for each item. (It is not required to store all the values together.)

8.After storing the values, reset the unit to exit from the adjustment mode. The values set in the EEPROM will be read during the resetting.

9.When the band is switched, there may be cases in which the preset number being displayed does not coincide with the stored setting value. To check this, be sure to recall the preset number after you switch the band.

Notes

1.The items that are not stored will be set to the default values.

2.Once a value is stored in memory, the value will always be used later.

(It is not allowed to modify the setting values by switching the destination type.)

KDC-2027SA/SAY/SG/SGY, 3027A/AY/G/GY KDC-308A/AY/G/GY, 4027/V/VY/Y, F327A/G

ADJUSTMENT

1. IC10 (TDA7513T) -TheTuner adjustment method

•When IC10 and its circumference are fixed, according to the following order, it readjusts if needed.

•The adjustment item changes with parts to exchange. Please refer to "Parts vs Adjustment item table".

1-1. VCO Coil Adjustment - Adjustment of Tunning Voltage

Voltage Check Point	: Vt-Check Land
	(PWB Side B, around D506)
Adjustment Coil	: L507 (VCO Coil)

The adjustment method : VCO coil is turned and adjusted according to the following tables.

TYPE	Mode	freq.	Voltage	Fig

E/M	AM	1611kHz	5.5 ± 0.1(V)	(C)

K	AM	1700kHz	5.8 ± 0.1(V)	(C)

J	FM	90.0MHz	5.6 ± 0.1(V)	(C)

M : AM Adjustment

For Your Information : The frequency of SET is only set up by Pre-Set-Key in case this adjustment

1-2. Adjustment of 1st & 2nd-MIX Coil

Voltage Check Point	: S-METER-Check Land
	(PWB Side B, around W572)
Adjustment Coil	: 1st IFT = L508 / 2nd IFT = L509

Setting of Signal Generator : Refer to the following tables

TYPE	MODE	freq.	Mod.	ANT Input	Fig

K	AM	1000kHz	OFF	35dBuEMF	(B),(C)

E,M,J	AM	999kHz	OFF	35dBuEMF	(B),(C)

qThe appearance and the coil with which S-METER DC voltage serves as the maximum are turned and adjusted

in the above-mentioned SG input.

wBy the above-mentioned adjustment method, same adjustment is performed to both sides (1st & 2nd MIX Coil).

(REAR VIEW)
	(TUNER ANT)
[Fig.1]	FM-SG	(A)
	AM-SG	(B)

L505

L506

L507

L508

L509

(OVER VIEW)

[Fig.2]

1-3. Adjustment of FM_ANT&RF Coil

Voltage Check Point	: S-METER-Check Land
	(PWB Side B, around W572)
Adjustment Coil	: ANT Coil = L505
	RF Coil = L506

Setting of Signal Generator : Refer to the following tables.

TYPE	MODE	freq.	Mod.	ANT Input	Fig

E/M	FM	87.5MHz	OFF	5 or 11dBuEMF	(A),(C)

K	FM	87.9MHz	OFF	5 or 11dBuEMF	(A),(C)

J	FM	76.0MHz	OFF	5 or 11dBuEMF	(A),(C)

qThe appearance and the coil with which S-METER DC voltage serves as the maximum are turned and adjusted

in the above-mentioned SG input.

wBy the above-mentioned adjustment method, same adjustment is performed to both sides (ANT & RF Coil).

1-4. Adjustment of STEREO (adjustment of 456k-VCO)

Adjust in TEST MODE

•How to enter the test mode

While pressing on [FM] and [PRESET 6] keys, reset the unit.

•Adjustment method

Complete on condition that show “ALL OFF” when pressing on [PRESET 1] and [PRESET 6] keys.

(Writing adjustment valve to the EEPROM.)

Effect of adjustment is in cofirmation of adjustment status at [PRESET 4] key.

•Display of [PRESET 4]

Adjustment “OK” : 14seg model “E2P OK” 7seg model “EPO”

Adjustment “NG” : 14seg model “E2P ERR” 7seg model “EPE”

•Releasing the test mode Reset mode only.

ACC off, Power off, Power down and Remove the panel mode is not releasing.

Check Land

IC10

S-METER

Check Land

(UNDER VIEW)

[Fig.3]

KDC-2027SA/SAY/SG/SGY, 3027A/AY/G/GY

KDC-308A/AY/G/GY, 4027/V/VY/Y, F327A/G

ADJUSTMENT

2. IC10 (TDA7513T) Replacement - Parts vs Adjustment Item Table

•When the parts in the following tables are exchanged, please readjust according to a table.

•When other parts are exchanged, please perform only a check of operation. There is no necessity for readjustment.

Replacement parts						Adjustment Item


Parts Name	Ref Number	TYPE	Parts Number	VCOVt	1st MIX	2nd MIX	ANT Coil	RF Coil	Stereo

	IC10	ALL	TDA7513T	K	K	K	K	K	K

EEP-ROM			M24C01-WMN6T
	IC12	ALL	BR24C01AF-W	K	K	K	K	K	K
			S-24CS02AFJ-TB

Antenna Coil	L505	J	L31-0966-05				K
	L505	E,K,M	L31-0967-05				K
		E,K,M	L31-0967-05

RF Coil	L506	J	L31-0969-05					K
	L506	E,K,M	L31-0970-05					K
		E,K,M	L31-0970-05

VCO Coil	L507	J	L32-0932-05	K	K	K	K	K
	L507	E,K,M	L32-0936-05	K	K	K	K	K
		E,K,M	L32-0936-05

1st MIX Coil	L508	ALL	L30-0770-05		K

2nd MIX Coil	L509	ALL	L30-0771-05			K

Variable Capacitance Diodes	D504	ALL	KV1720S	K	K	K	K	K

Variable Capacitance Diodes	D505	ALL	KV1720S	K	K	K	K	K

Variable Capacitance Diodes	D506	ALL	KV1720S	K	K	K	K	K

X'tal	X501	ALL	L77-2077-05

• The “K ” mark shows that the adjustment is need.

Kenwood KDC-3027-A, KDC-3027-G, KDC-3027-AY, KDC-3027-GY, KDC-4027 Service manual

KDC-2027SA/SAY/SG/SGY, 3027A/AY/G/GY

KDC-308A/AY/G/GY, 4027/V/VY/Y, F327A/G

PC BOARD (FOIL SIDE VIEW)

ELECTRIC UNIT X34-3102-7x (J74-1465-22)

W137

W81

R251/W405

R254/W406

W55

W37

W58

W44

W136

TH1

IC4

Q55BE

W133

R28

D263

D266

D261

D268

D264

D267

W156

D407

D410

R404

R406

R405

R25

W67

W52

C63

W175

D14

D12

D265

D262

W90

W89

R252/W407

R253/W408

Q51

R71

D13

D11

W102

W93

C258

W409/R260

C255

C253

C254

D51

W135

W88

W84

W122

W86

R256

C252

W50

C251

D411

R57

W114

R257

R263

Q251

Q40

D403

D402

C257

D405

E B E

D408

C58

W410

R30

R72

C30

W119

D10

R22E B

D253

D252

R261

R412

D40

W554

C50

R20

D30

W161

W162

D409

D70

R32

B E

W124

W115

R11

C21

Q20

D251

D20

R21

W158

W60

W57

W51

W48

W45

W25

B E

C51

Q70

R73

W80

W553

C52

R31

R259

C256

IC7

C54

Q10

R10

W70

W555

W74

W556

W111

W92

W65

W113

W108

W100

W95

R12

R51

C600

C55

W71

C53

R23

Q50

W68

W558

W557

W72

W160

W559

C224

C593

W103

D50

Q53

WH1

1 5

W562

W580

R264

R119

IC8

C223

C57

W101

R50

E B E

W66

W125

R67

W73

D101

3 4

C103

R125 W109

CP3

R122 61

R68

R69

IC1

R138

R137R110

R174

W87

W77

R413

R118

W174

R116

W531

W417

W563

L516

C560

W85

R255

W63

W104

R115W96

W76

W566

W565

W564

R108

W61

C404

C56

CP1

R117

R258

R201

C565

R113

R114

CP2

R136 R135

R415

W532

IC11

R111 R112

C562

R140

2 1

R139

L101

R126

C105

W105

W97

W79

W78

W75

W64

W62

W59

W42

W40

W573

R128

R127

R129

R414

C102

R121

R130

R107

W54

W49

W47

R104

W43

R103

W157

C101

C104

R131

R105

W165

R106

W116

C106

R133

D202

D103

W24

W130

W138

W578

W82

R144

C205

R102

W129

W120

R132

W53

C204

CN1

W519

W128

W127

R123

W98

R141

D110D201

EB W134

W131

R143

W117

W112

W110 W107

W106

W99

R176

D111

R169

R168

R167

W121

R142

R353

W118

R145

W91

D109

W94

R166

D106

Q101

Q102

R163

C142

W404

R101

R172

D102

WH2

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