Kenwood KDC-3018-R, KDC-305-RG, KDC-3090-A, KDC-3090-R, KDC-3090-G Service manual

CD RECEIVER

KDC-305RG/3018R
/3090R/A/G/YA/YG

SERVICE MANUAL

● KDC-305R

Knob(RELEASE)
(K24-3665-04)

Knob(VOL)
(K25-1256-03)

Knob(EJ)
(K24-3653-04)

DIGITAL AUDIO

Front glass
(B10-3298-01:3018R)
(B10-4002-01:/3093RG)
(B10-4002-01:/3090RA/YG/YA)
(B10-4003-01:305RG)

KDC-305R

COMPACT

Knob(1-6)
(K25-1253-03)

© 2000-12 PRINTED IN JAPAN

B51-7704-00(S) 2117

Panel assy
(A64-2214-02:3093RG)
(A64-2214-02:3090RA/YG/YA)
(A64-2215-02:305RG)

45Wx4

AUD

PWR OFFLOUD SCAN RDM REP

Knob(Q)
(K24-3652-04)

T1

VOL ADJ

Knob(FM/AM)
(K25-1255-03)

PTY

MENU

Knob(CLK)
(K25-1254-03)

Mounting hardware assy
(J21-9641-03)

Antenna adaptor
(T90-0534-05)

Plastic cabinet assy
(A02-1486-13)

DC cord
(E30-4785-05:)
(E30-4790-05:)

Lever
(D10-4589-04)

KDC-305RG/3018R/3090R/A/G/YA/YG

BLOCK DIAGRAM

2

KDC-305RG/3018R/3090R/A/G/YA/YG

COMPONENT DESCRIPTION

●SWITCH UNIT(X13-9872-XX)

Ref.No. Component Name Application/Function Operation/Condition/Compatibility

IC1 LC75883E LCD driver Ready on key-matrix
Q1 DTA114EKorKRA102Sor key-matrix permission SW Ready on key-matrix, ON when the base goes "Lo"

UN2111

●ELECTRIC UNIT(X25-8712-XX)

Ref.No. Component Name Application/Function Operation/Condition/Compatibility

IC1 UPD780058GC232 System µ-COM.
IC2 TDA7407D E-VOL. & N.C. MPX
IC4 TDA7386 Power IC
IC6 TDA7479D RDS decoder
IC7 BA4911-V4 Power supply IC
IC8 HD74HC27FP Mute gate IC 3 input NOR gate x3
IC11 S-80830ANNP RESET IC Detection voltage 3.0V
IC12

Q10 2SC4081or2SD1819A B.U. detection Detect BU voltage
Q20 2SC4081or2SD1819A ACC detection Detect ACC voltage
Q40 DTA124EUAorUN5112 PREOUT mute driver Mutes when base is "Lo" (controls Q221-224)
Q50 2SA1036K SW 5V ON when the base is "Lo".
Q51 UMC2N SW 14V ON when the base is "Hi" (controls Q55)
Q53 UMC2N Switch for power supply IC ON when the base is "Hi" (controls SW1 pin of power

Q55 2SD2375or2SD2396 AVR for SERBO +B Output issued when SW14V is on (base is "Hi")
Q70 2SC4081or2SD1819A SURGE detection Detect SURGE voltage
Q101 2SC4081or2SD1819A DSI SW DSI LED turns ON when base is "Hi"
Q102 DTA114YUAorUN5114 PANEL 5V SW ON when the base is "Lo"
Q201 2SC4081or2SD1819A NOISE Buff
Q223,224
Q251 DTC114YUAorUN5214 Power IC SVR SW Turns ON when base is "Hi" and capacitor on SVR

Q301 DTC124EUAorUN5212 FM Lo/DX SW Turns ON during Lo. SEEK when base goes "Hi"

BR24C01AForBR24C01AF-W
M24C01-WMN6TorS-24C01B

DTC143TUAorUN5216 PREOUT MUTE Mute applied to PREOUT (output) when base is "Lo"

E2PROM

supply IC)

pin discharges

3

KDC-305RG/3018R/3090R/A/G/YA/YG

MICROCOMPUTER'S TERMINAL DESCRIPTION

●Terminal Description

Pin Function I/O Description Processing Operation

1 AV CONT O A/D converter reference voltage control output ”Hi”: ON / ”Lo”: OFF
2 IC2 TYPE0 I IC2 setting terminal ”Lo”: Initial value
3 IC2 TYPE1 I IC2 setting terminal ”Lo”: Initial value
4 AVSS - Ground connection terminal connected to GND
5 M MUTEL I Muting request from the MICOM. of CD mecha. ”Lo”: Mute request
6 N.C O Not used
7 AVREF1 I D/A converter reference voltage input
8 ILLUMI O Illumination AVR ON/OFF control output ”Hi”: AVR ON

9 L RES O Reset output to the LCD driver IC ”Lo”: Reset
10 PANEL I Panel open/close detection input ”Lo”: Panel closed
11 L DATAL I Data input from the LCD driver IC
12 L DATAS O Data output to the LCD driver IC
13 L CLK O Clock output to the LCD driver IC
14 N.C O Not used
15 N.C O Not used
16 CH-DATAC I Data input from changers
17 CH-DATAH O Data output to changers
18 CH-CLK I/O Clock input/output with changers
19 L CE O CE output to the LCD driver IC ”Hi”: Active
20 N.C O Not used
21 M RST O Reset output to the MICOM. of CD mecha. ”Lo”: Reset
22 M STOP O Stop request to the MICOM. of CD mecha. ”Lo”: Stop
23 MOSW O CD mechanism loading motor control output ”Hi”: Loading & Eject / ”Lo”: other
24 PLL SCL O Clock output to the tuner pack
25 AM+B O AM+B control ”Hi”: during AM reception
26 FM+B O FM+B control ”Hi”: during FM reception
27 M-SCL I/O Clock input/output with the MICOM. of CD mecha.
28 DSI O DSI output ”Hi”: LED ON
29 LO/EJ I/O CD mecha.Loading/Eject switching output ”Lo”: Loading / ”Hi”: Eject
30 SW3 I Down & limit switch detection input ”Hi”: Chucking / ”Lo”: Pickup most inner position
31 R DATA I Data input from RDS decoder
32 R QUAL I Quality input from RDS decoder
33 VSS1 - Ground connection terminal connected to GND
34 SD I SD input from the tuner pack ”Hi”: Station detected
35 IC2 SCL O Clock output to the E-VOL. IC
36 M-SDA I/O Data input/output with the MICOM. of CD mecha.
37 PLL SDA I/O Data input/output with the tuner pack
38 IC2 SDA I/O Data input/output with the E-VOL. IC
39 MUTE O Mute control output ”Hi”: Mute ON / ”Lo”: Mute OFF
40 N.C O Not used
41 AFC O AFC control output ”Lo”: during FM seek
42 CH-REQH O Request output to changers ”Lo”: Request
43 CH-CON O Changer control ”Lo”: Standby / ”Hi”: ON
44 N.C O Not used
45 P MUTE O Power IC mute control ”Lo”: Mute
46 SVR O Power lC reset terminal When the momentary power down, after ACC

OFF/ON is detected and after POWER ON/

OFF, the output goes ”Hi” temporarily.
47 STBY O Power IC standby control output ”Hi”: POWER ON mode
48 P CON O Power control ”Hi”: POWER ON mode except ALL OFF mode
49 P ANT O Antenna control ”Hi”: during FM/AM reception
50 BEEP O BEEP sound output
51 ACC DET I ACC detection input ”Hi”: ACC OFF / ”Lo”: ACC ON
52 BU DET I Momentary power down detection input ”Hi”: When momentary power down detected

or BU OFF / ”Lo”: BU ON
53 N.C O Not used

4

KDC-305RG/3018R/3090R/A/G/YA/YG

KDC-305RG/3018R/3090R/A/G/YA/YG

MICROCOMPUTER'S TERMINAL DESCRIPTION

Pin Function I/O Description Processing Operation

54 N.C O Not used
55 N.C O Not used
56 SW5 O SW 5V control ”Lo”: POWER ON mode
57 P ON O
58 TYPE2 I Destination type input terminal 2
59 N.C O Not used
60 RESET I Reset input terminal ”Lo”: System reset
61 REMO I Data input from the remote control light sensor
62 R CLK I Clock input from RDS decoder
63 CH-REQC I Request input from changers ”Hi”: Request
64 SW1 I Loading detection ”Lo”: CD chucking
65 KEY-REQ I Key request terminal ”Lo”: Request
66 SW2 I 12cm disc detection terminal ”Lo”: 12cm disc
67 VSS0 - Ground connection terminal connected to GND
68 VDD1 - VDD connection terminal
69 X2 - Main clock resonator connection terminal
70 X1 I Main clock resonator connection terminal
71 IC(TEST) - Not used connected to GND
72 XT2 - Sub clock resonator connection terminal N.C.
73 N.C I Sub clock resonator connection terminal connected to BU5V lines
74 VDD0 - VDD connection terminal
75 AVREF0 I A/D converter reference voltage input
76 SMETER I S-meter input from the tuner pack
77 PHONE I PHONE detection input
78 NOISE I Noise detection input
79 TYPE0 I Destination type input terminal 0
80 TYPE1 I Destination type input terminal 1

Microprocessor peripheral power supply control terminal

”Hi”: ACC ON or during CD Loading/Eject

1V or less: TEL MUTE,2.5V or greater: NAVI MUTE

ADJUSTMENT

Test Mode

1. How to enter test mode

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

2. How to exit from test mode

Reset the unit.
The test mode is not terminated by turning ACC off, power
off, momentary power down or panel detaching.

3. Test mode specifications of CD receiver

•Pressing the Track Up key jumps 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 jumps to the track
immediately before the track being played.

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

•Forced ejection is not provided.

4. Test mode specifications of cassette receiver

•Blank skip (B.S) is off.

•Pressing the ATT key ejects the cassette.

5. Audio functions

•Pressing the AUDIO key or the OPEN/CLOSE key on the
remote controller initiates the Audio 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 –10 dB (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.

6. Menu mode

•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.

7. 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 3 CD (or TAPE with C/R models)

operating hours

Pressing Preset 5 CD (or TAPE with C/R models)

ejection count

•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 Subaddress: 9
2: Configuration Subaddress: D

Default values

If they are not written in the EEPROM, the default values
specified by the IC developer are set in IC2-3.

Adjustment procedure

1: Enter the IC2-3 Adjustment mode by resetting the unit while

holding d + h.
2: Select the TUNER source by pressing SRC.
3: When the adjustment mode is entered, the display shows a

2-digit hex number.
4: When preset a or s 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 4 or ¢
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 which 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.)

5

6

A B C D E F G IH

PC BOARD (Component Side View)

1

ELECTRIC UNIT

X25-8712-XX(J74-1122-12)

ELECTRIC UNIT
(X25-8712-XX)

.ON.feR
CIQ
1F5
2C4

2

4D2
6B5
7F3
8E4

11F5
21D4

01E3
02E3
04C3
05E4
15G3
35E4

3

55G2
07E3

101F6

201F6

102C4

122C3

222C3

322B2

422B2

152D3

103B4

4

5

6

sserddA

C225

J1

R232

R228

R224

Q224

W2

C226

A1

C302

Q301

1

3

EB

C351

CN2

C305

1

R173

C303

C307

C306

C224

C301

C308

L305

L306

D4

L4

W1

D3

R302

24

CN3

1

C228

2

1

W3

R229
R225

R230
R226

R227

R223

Q40

C352

C354

R231

Q223

C223

W6

J5

EBEB

Q221

EB

Q222

EB

EB

L303

L304

W4

C304

W5

8

IC6

16

C356

X2

C355

9

C402

W7

W160

C353

W11

R402

C221

W14

W9

W10

R301
W13

R353

13
9

R221

R222

W19

W12

W16

R403

Q201

W15

W17

W18

R351

1112
10

C401

W22

EB

W21

W20

R401

R352

W23

R205

6

R408

C222

R204

W152

W24

D107

R171

4

76

R411

W25

R202

R201

C403

W26

R170

3

J4

R409

D402

W27

C209

R164

2

15

W30

W29

R410

W159

W32

W28

R165

15

R407

D411

W31

15

14

R203

C211

W34

R166

14

R405

D409

D401

C207

C210

W33

W35

R167

R406

D407
D410

C204

C206

W36

D403

W151

D104

D106

R168

R404

W39

D40

IC2

D103

R169

W37

D404

W40

C201

C202

D201

W42

W41

W156

C251

28

1

D202

W43

1

W162

W45

C205

2

W44

2

R253

C254

W48

W46

W38

C203

R116

W47

P1

C142

1

R254

R251

W55

W58

IC4J4

C501

W52

W50

R252

C252

C253

W161

C256

W60

W57

W51

L201

8

5

IC12

R412

4

1

R413

W168

W61

W56

R118

W62

W64

W59

W54

W49

W157

W165

CN1

2

121

W67

W65

W53

C500

W70

W68

W69

W66

W75

W74

W71

W72
W73

C404

R415

R256

Q251

W78

W76

24

C255

EB

R258

W77

W79

R144

W81

25

W80
R259

W63

W163

W82

W84

R260

C258

R263

W167

W164

R261

R135

W85

W86

R136

R109

TH1

W88

W158

R51

R50

8

7

R137

W87

22

C257

D252

R21

IC8

R138

W89

D253

Q50

BE

R58

J3

W90

D20

C40

14

W150

R110

D30

D251

Q20

W92

1

R114

R121

W91

W93

R163

R172

R257

EB

R12

R112

R108

R107

R141

W94

R22

W95

R119

J2

R31

C21

R23

W96

R140
R139

W97

R143

R30

R73

W100

R111
R113

W99

C30

R32

W169

R11

W101

R264

R115

21

20

R105

R102
R132

Q10

R255

W83

16

1

EB

R145

EB

W108

Q53

E

B

R103

R104

W98

W102

R20

Q70

R10

W111

E

R117

W105

W106

R25

D12

D11

W166

D70

W104

R133

W110

W107

D10

D50

40

C106

W115

W113

IC1

1

W112

C60

C53

W114

C51

C55

41

80

R134

W116

Q102

EB

R28

D13

CP1

X1

9
8

W119

R54

C57

D14

R72

C64

C59

W103

W121

C50

C61

CP2

R131

W117

C52

R53

R67

W120
W138

60
61

C102

C105

W155

R71

C104

R52

D1

C58

C54

R55

R122

CP3

R127

R414

R106

W124

W125

W171
W172

W173

W174

W127

L1

W122

1

12

R125

R126

C103

4

W128

L2

IC11

1

W133

2

3

W129
W130

W131

C56

R218
R129

R130

W132

W134

R101

IC7

C101

W135

Q101

D101

EB

L101

C1

C63

D51

C62

D102

W136

R57

W137

Q55

Q51

E

R56

E

B

E

B

SWITCH UNIT

X13-9872-XX(J74-1116-12)

D26

D27

56

ILL-GND

1 36 37

ED1

LED+B

KI5

R14

KS5

KS4

D2

D1

24

1

D23

REMO

D24

D25

R21

KI1

dB

D13

PL1

LAMP+B

25

80

C4
C3

R8

C1

R7

B

Q1

R5

L-CLK

R3

R4

LDATAS

R2

KS4

R18

R16
R1

D20

R19

R17

C2

R10

E

D28

D21

KS5

KI1

IC1

R6

L-RES

L-CE

LDATAL

D22

PL2

KS3

D3

FM

KS2

KS2

CP2

KI5

D-GND

SW5V

PANEL SW

R15

KI2

AM

RST

CLK

KS3

KI2

AUTO

SRC

CP3

40

65

CP1

R9

2

14

J1

KI4

1

PAN5V

ESD-GND

KI3

D14

D10

64

D8

D7

D12

D11

41

D9

4

3

D6

D5

D4

SWITCH UNIT
(X13-9872-XX)

.ON.feR
CIQ
1H4
2H6

1H5

6

5

KI3

1

15

2

ATT

RST

sserddA

7

7

Refer to the schematic diagram for the values of resistors and capacitors.

8