Kenwood KDC-1023, KDC-1023-S, KDC-122, KDC-122-S Service manual

CD RECEIVER

KDC-1023/S KDC-122/S

SERVICE MANUAL

© 2002-11 PRINTED IN JAPAN B53-0005-00 (N) 1724

CD mechanism operation description is not in this sarvice manual.		CD mechanism extension cord : W05-0618-00
Please, refer to sarvice manual X92-4030-0x (B51-7867-00).
Panel assy	Front glass	Escutcheon
(A64-2907-02): KDC-122	(B10-4355-01): KDC-122	(B07-3060-02): KDC-122
(A64-2908-02): KDC-122S	(B10-4356-01): KDC-122S	(B07-3022-02): KDC-122S

KDC-122

COMPACT

DIGITAL AUDIO

45Wx4

CRSC

LOUD	SCAN	RDM	REP	CLK ADJ AUTO AME
OFF				AUD

Panel assy	Front glass	Escutcheon
(A64-2909-02): KDC-1023	(B10-4357-01): KDC-1023	(B07-3001-02): KDC-1023
(A64-2910-02): KDC-1023S	(B10-4358-01): KDC-1023S	(B07-3022-02): KDC-1023S

KDC-1023

COMPACT

DIGITAL AUDIO

50Wx4

CRSC

LOUD	SCAN	RDM	REP	CLK ADJ AUTO AME
OFF				AUD

DC cord	Mounting hardware assy	Lever	Screw set
(E30-4784-05)	(J21-9716-03)	(D10-4589-04)x2	(N99-1719-05)

2

	FM+B			A8V				FM(J,K) : 1800mV
	Q502		IC10				Q223,224	FM(E) : 1372mV	CD : 3600mV
							PRE	AM(J,K) : 600mV		PRE
ANT	FM AGC		FM AGC OUT					AM(E) : 855mV	CH : 3600mV
							MUTE	IC4		OUT
	AM+B
	Q501
	AM AGC		AM AGC OUT				IC8	POWER IC		SP
				TUNER,MPX &						OUT
	CD	SERVO		E-VOL.			MUTE	MUTE
							LOGIC
				OUT
		BU5V
		A8V		TUNER
	AUDIO OUT	1200mV	CH					Q10
								BU		BACK
			CD
	12EJE							DET		UP
	LO/S	1200mV		IC6				ACC
	SCLK					IC12
	SDA						EEP-ROM	Q20
	8EJE
	MUTE							DET		ACC
	RST			RDS	BU5V		IC11
	STOP
				DECODER			RESET		IC7
	LO/EJ
	MO						IC		POWER
	LOE/LIM
									SUPPLY IC
			IC1
									P-CON	P-CON
	CHANGER								P-ANT	P-ANT
	AUDIO OUT							Q51,55
	RST			MI-COM			SERVO	SERVO	VCC
	REQ C
	CLK								SW1
	DATA H								SW2
	CH-CON							Q50
	REQ H							SW5V	BU5V
	DATA C						SW5V
	MUTE							BU5V
									FM+B
		BACK UP						FM+B
								AM+B	AM+B
				BU5V			SW5V	A8V	AUDIO+B
									ILLUMI
						IC2		BACKLIGHT
							KEYILLUMI
			LCD	LCD DRIVER			REMOCON
				WITH
				KEY MATRIX

1023/1023S/122/122S-KDC DIAGRAM BLOCK

KDC-1023/1023S/122/122S

COMPONENTS DESCRIPTION

● SWITCH UNIT (X16-1460-13/2370-11)

Ref.No.	Application/Functions	Operation/Condition/Compatibility
IC1	LCD driver & key matrix
Q1	Key scan start	When Q1 base goes Lo, key scan start.

● ELECTRIC UNIT (X25-9600-xx)

Ref.No.		Application/Functions	Operation/Condition/Compatibility
IC1	System control µ-com		System µ-com
IC4	Power amplifire		E-Vol output encoder power amplification for speaker.
IC7	Power supply (Multi AVR)		-
			When a pin 1, 2, or 13 is "H", MUTE turns on
IC8	MUTE Logic		When a pin 3, 4, or 5 is "H", P-AMP mute turns ON.
			Changer is RESET when a pin 9, 10, or 11 is "L".
IC10	Tuner & E-Vol.		FM/AM tuner & stereo decoder & E-Vol.
IC11	Power on reset		When B.U. 5V voltage is less than 3.5V, power reset.
IC12	E2P-ROM		Writing and read-out of adjustment data for a tuner
Q10	B.U. detector		BU on (base "H") : Collector "H"
Q20	A.C.C	detector	ACC ON (base : "H") : Collector "L"
Q40	MUTE	driver	Base "L" : Mute on (collector "L")
Q50	SW 5V		Base "L" : SW5V on
Q51	SERBO AVR control		Pin 2 "H" : Serbo on (pin 4 "H")
Q53
Q55	SERBO AVR		Base "H" : Serbo on
Q70	Surge detector		Base "H" : Surge detect
Q223,224	MUTE		Base "H" : Mute on
Q251
Q501	AM RF amplifire		Base "H" : Gain UP
Q502	FM RF amplifire		Gate "H" :Gain UP

3

KDC-1023/1023S/122/122S

MICROCOMPUTER'S TERMINAL DESCRIPTION

● SYSTEM MICROCOMPUTER uPD780058GC501 (X25 : IC1)

	Pin No.	Name	I/O	Description		Processing Operation
	1	TDF DET	I	Panel detection	H:Panel detached			L:Panel attached
	2	8EJE SW	I		H:Eject is completed
					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	∆3 normal H , Power off L
					When 7seg model,output L
	6	L-CE	O	LCD driver selection	H:Select (panel communication)
					When panel attached,output L
	7	AVREF1
	8	NC		Not used (connected to 9pin)
	9	IC10-DATA	I/O	IC10,E2PROM data communication	∆3 non communication : H
	10	IC10-CLK	O	IC10,E2PROM clock communication	∆3 non communication : H
					Non communication : H
	11	L-DATAL	I	Data input from the LCD driver	When panel detached : L
					∆3 Pull down on X25 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
					Except changer model : output L
	18	CH-CLK	I/O	Clock input/output with the Changer (new 5L)	Check the old and new
					Except changer model : output L
	19	CH-REQH	O	Request output to the changer (new 5L)	L:Requset
					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
					∆3 (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
					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.
	31	TYPE0	I	Destination type selection terminal 0	Refer to destination type list.
	32	TUNER-TYPE1	I	Destination available/genuine model rool off	H:genuine model 1			L:available model
	33	Vss1
	34	TUNER-TYPE0	I	Destination available/genuine model noise cancel	H:genuine model 0			L:available model
	35	MUTE	O	Mute (E.Vol,Preset) control	H:mute on	L:mute off
					Power off after that 15 second L
	36	M-DATA	I/O	Data input/output with the CD mechanism	∆3 non communication : H
	37	M-CLK	O	Clock output to the CD mechanism	∆3 non communication : H
					When adjustment = H
	38	ADJ	O	Tuner lines adjustment	PS1-0,1=L		PS1-2,2-0,1=Hi-z
					IC10-DATA,CLK=Hi-z
	39	P-MUTE	O	Power IC mute control	H:mute off	L:mute on
					Power off after that 15 second H
	40	SVR	O	Power IC servo control	H:When momentary power down detected
					L:Nomal
	41	P-STBY	O	Power IC standby control	H:Power IC ON		L:Power IC OFF
	42	SW5V	O	SW 5V control	H:SW5V OFF		L:SW5V ON
					Power off after that 10 second H
4

KDC-1023/1023S/122/122S

MICROCOMPUTER'S TERMINAL DESCRIPTION

Pin No.

Name

I/O

Description

Processing Operation

43

B.U-DET

I

Back up detection terminal

H:power down

L:B.U. on

44

ACC-DET

I

ACC detection terminal

H:ACC OFF L:ACC ON

Power supply IC SW1 control 0

45

PS1-0

O

BA4911 SW1

Power supply IC output

Audio 8V,P-CON

PS1-2

PS1-1

PS1-0

A8V

P-CON

P-ANT

L

L

L

STANBY

Power supply IC SW1 control 1

46

PS1-1

O

L

L(H)

H(L)

ON

OFF

OFF

Audio 8V,P-CON

L

H

H

ON

ON

OFF

47

PS1-2

O

Power supply IC SW1 control 2 P-ANT

H

H

H

ON

ON

ON

48

PS2-0

O

Power supply IC SW2 control 0

BA4911 SW2

Power supply IC output

ILL,FM,AM

PS2-1

PS2-0

ILLUMI

FM

AM

L

L

STANBY

49

PS2-1

O

Power supply IC SW2 control 1

L(H)

H(L)

ON

ON

OFF

H

H

ON

OFF

ON

ILL,FM,AM

50

BEEP

BEEP

H:Light on

L:Light off

51

DSI

O

DSI control

When panel attached,output L

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

FIX model is output L

52

NC

O

Not used (out put L)

53

NC

O

Not used (out put L)

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

L:DISK IN(Loading Start)

65

KEY-REQ

I

Key input detected

H:Key no input

(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

∆3 MAIN X'tal oscillating circuit

∆3

4.19MHz X'tal connection

70

X1

∆3 MAIN X'tal oscillating circuit

∆3

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,

connection to the 80pin AVCONT

76

S-METER

I

S-meter input

77

NOISE

I

FM noise detection input

∆3

2.5V or greater:NAVI MUTE

78

PHONE

I

2way 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

same timing with PON

5

KDC-1023/1023S/122/122S

MICROCOMPUTER'S TERMINAL DESCRIPTION

● MECHANISM MICROCOMPUTER MN6627771KP (X32 : IC2)

	Pin No.	Name	I/O	Description	Processing Operation
	1	TVD	O	Traverse driver output (PWM output)
	2	SPL	O	Spindle motor drive output (PWM output)
	3	PC	O	Spindle motor ON output	L:ON H:OFF (default )
	4	PWM	O	multi-purpose PWM output	It's possible to setup the TOSF2
	5	TBAL	O	Tracking balance adjust output (PWM output)
	6	FBAL	O	Focus balance adjust output (PWM output)
	7	NRFDET	I	RF detection signal input	L:detected
	8	OFT	I	Off-track signal input	H:detected
	9	BDO	I	Drop out signal input	H:detected
	10	LDON	O	Laser on signal output H:ON	When command FO on,LDON is H
	11	DSLB	O	DSL balance output
	12	DVDD1	-	Power supply for digital circuit
	13	DVSS1	-	Ground lines for digital circuit
	14	AVSS2	-	Ground lines for analog circuit	For DSL,PLL and AD
	15	DSLF	I/O	Loop filter terminal for DSL	The bias of ARF output terminal in one
	16	ARF	I	RF signal input
	17	RFSW	I	When DSL circuit,constant switch terminal
	18	PLLF	I/O	Loop filter terminal for PLL
	19	PLLF2	I/O	Loop filter characteristic switching terminal for PLL
	20	IREF	I	Standard voltage input terminal
	21	RFENV	I	RF envelope signal input	Analog input
	22	TRCRS	I	Track cross signal input	Analog input
	23	TE	I	Tracking error signal input	Analog input
	24	FE	I	Focusing error signal input	Analog input
	25	AVDD2	-	Power supply for analog circuit	For DSL,PLL and AD
	26	AVSS1	-	Ground lines for analog circuit	For audio output (Lch and Rch in one)
	27	OUTR	O	Rch audio output
	28	AVDD1	-	Power supply for analog circuit	For audio output (Lch and Rch in one)
	29	OUTL	O	Lch audio output
	30	DVSS3	-	Ground lines for digital circuit
	31	CSEL	I	Oscillation frequency specification terminal	H:33.8488MHz L:16.9344MHz
	32	NC	O	Not used
	33	ASEL	I	Audio output polarity switching terminal	L:Reverse H:Non reverse
	34	MSEL0	I	Destination type selection port (set 2bit)	Order "MSEL 0" and "MSEL 1" Set up
	35	MSEL1	I	Destination type selection port (set 2bit)	Order "MSEL 0" and "MSEL 1" Set up
	36	ICRST	O	Reset control terminal for external DAC
	37	BCLK	O	Bit clock output for serial data
	38	LRCK	O	L/R identification signal output
	39	SRDATA	O	Sirial data output
	40	VREFP	I	A/D converter standard power supply input
	41	HOT	I	Temperature protection detection terminal (AD input)	Over C5(h):on
	42	8EJE_SW	I	8cm disc eject stop detection terminal	H:Stop
	43	12EJE/SDET_SW	I	Judge the 8cm or 12cm disc	12cm disc stop detection terminal
	44	LOE/LIM_SW	I	Pick-up inside detected	Loading end detection terminal
	45	PCK	O	PLL extracted clock output,etc
	46	EFM	O	EFM signal output,etc
	47	SENSE	O	Optics servo status signal output,etc
	48	CLVS	O	Spindle servo phase synchronous signal output,etc	L:Normal operation H:Luff servo
	49	DEMPH	O	Dephase detection signal output,etc	H:on
	50	DVDD2	-	Power supply for digital circuit
6	51	X1	I	Main clock input terminal

KDC-1023/1023S/122/122S

MICROCOMPUTER'S TERMINAL DESCRIPTION

Pin No.	Name	I/O	Description	Processing Operation
52	X2	O	Main clock output terminal
53	DVSS2	-	Ground lines for digital circuit
54	XSUB1	I	When external DAC,external clock input terminal
55	XSUB2	O
56	TEST1	I	Test port 1	Normal operation is H fixed
57	TEST2	I	Test port 2	Normal operation is H fixed
58	NC	O	Not used
59	VER/HOR	O	Put length or breadth switching motor terminal	H:Put length L:Put breadth
60	DRV_MUTE	O	Driver mute control terminal	L:MUTE ON H:MUTE OFF
61	/MUTE_L	O	Audio Lch MUTE output	L:MUTE
62	/MUTE_R	O	Audio Rch MUTE output	L:MUTE
63	/RST	I	LSI reset input terminal	H:Normal L:Reset
64	OCD_CLK	I	When OCD connected, clock input
65	/MSTOP	I	Standby detection terminal	H:Normal L:Mecha stop
66	DATA	I/O	I2C bus data line (communication line with system computer)	At that time serial writer connected
67	SBIO	I	When connected to serial writer,data input terminal
68	/CLK	I/O	I2C bus clock line (communication line with system computer)	At that time serial writer connected
69	TX	O	Digital audio interface signal output
70	EQCNT	O	RF EQ switching terminal	L:x2 times H:x1 times
71	XSEL	I	During the external DAC connection	MCLK external input (H:input)
72	MCNT	I	CD mecha Loading/Eject control ON/OFF	L:OFF (HOST control) H:mechanism control
73	P-ON	O	Audio and servo origin power control terminal	L:power on H:power off
74	MOTOR	O	Loading/Eject control switching terminal	At that time LO/EJ is "H"
75	LO/EJ	O	Loading/Eject control terminal or output L	When 72pin (P82) is "L",output "L"
76	CD-RW	O	CD-RW control terminal	H:CD-RW L:normal
77	LDCNT	O	LD control terminal	Operation is same LDON as timing
78	DVDD3	-	Power supply for digital circuit
79	FOD	O	Focus driver output (PWM output)
80	TRD	O	Tracking driver output (PWM output)

System mi-com Destination type list

		TYPE2	TYPE1	TYPE0	MODEL NAME
		L	L	L	KDC-2024SA/SYA, 2024SG/SYG
	uPD780058GC499	L	L	H	KDC-2022, 2022V,202MR
		L	H	L	RY-391CD, RX-491CD
		L	H	H	KDC-4023, 2023, 3023
		L	L	H	KDC-122, 122S
	uPD780058GC501	L	H	H	KDC-1023, 1023S
		H	L	H	KDC-222, 222S
		L	L	L	KDC-3024G/YG, 307G/YG
	uPD780058GC502	L	H	H	KDC-3023R
		H	L	L	KDC-3024A/YA, 307A/YA
		H	L	H	KDC-4024/Y/V/YV
	uPD780058GC503	L	L	L	KDC-2094YA/YG
	H:	R135	R137	R139
	L:	R136	R138	R140

7

KDC-1023/1023S/122/122S

ADJUSTMENT

1.IC10 (TDA7513) -The Tuner 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)
W(Wide Band)	FM		108.0MHz		7.2 ± 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			: 1stIFT = L508 / 2ndIFT = 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,W	AM	999kHz	OFF		35dBuEMF	(B),(C)

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

in the above-mentioned SG input.

By 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)
W(Wide Band)	FM		65.0MHz		OFF		5 or 11dBuEMF	(A),(C)

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

in the above-mentioned SG input.

By 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.

(C) DC Voltmeter

Vt

Check Land

IC10

S-METER

Check Land

(UNDER VIEW)

[Fig.3]

8

KDC-1023/1023S/122/122S

ADJUSTMENT

2.IC10 (TDA7513) 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	TYPE	Parts Number	VCOVt	1st MIX	2nd MIX	ANT	RF Coil	Stereo
	Number						Coil
	IC10	ALL	TDA7513	™	™	™	™	™	™
EEP-ROM			M24C01-WMN6T
	IC12	ALL	BR24C01AF-W	™	™	™	™	™	™
			S-24CS02AFJ-TB
Antenna Coil		J	L31-0966-05
	L505	E,K,M	L31-0967-05				™
		W(Wide Band)	L31-0968-05
RF Coil		J	L31-0969-05
	L506	E,K,M	L31-0970-05					™
		W(Wide Band)	L31-0971-05
VCO Coil		J	L32-0932-05
	L507	E,K,M	L32-0933-05	™	™	™	™	™
		W(Wide Band)	L32-0934-05
1st MIX Coil	L508	ALL	L30-0770-05		™
2nd MIX Coil	L509	ALL	L30-0771-05			™
Variable Capacitance Diodes	D504	J,E,K,M	KV1720S	™	™	™	™	™
		W(Wide Band)	KV1735S
Variable Capacitance Diodes	D505	J,E,K,M	KV1720S	™	™	™	™	™
		W(Wide Band)	KV1735S
Variable Capacitance Diodes	D506	J,E,K,M	KV1720S	™	™	™	™	™
		W(Wide Band)	KV1735S
X'tal	X501	ALL	L77-2077-05
				The "™" mark shows that the adjustment is need.

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