Kenwood KRC-2902YA Bedienungsanleitung

B51-7882-00 (N)1089

CASSETTE RECEIVER

KRC-2902YA/G

SERVICE MANUAL

45Wx4

HIGH POWER

KRC-2902

LOUD

PWR

OFF

AMEAUTO

CLK

SRC

AUD

T. CALL

WIDE BAND

REW

PR FF

Lever

(D10-3031-04)x2

Plastic cabinet assy

(A02-1486-13)

Mounting hardware assy

(J21-9491-13)

DC cord

(E30-4790-05)

Antenna adaptor

(T90-0523-05)

Escutcheon

(B07-2124-02)

Knob (ATT)

(K25-1388-03)

Cassette lid

(A53-1638-13) Panel assy

(A64-2520-02)

KRC-2902YA/G

BLOCK DIAGRAM

IC1

KEY

PAN 5V

MUTE

B.U. DET. B.U.

ACC

POWER IC

EQ. AMP.

CH ISO AMP

NC/MPX/

E-VOL.

FRONT Lch

FRONT Rch

REAR Lch

REAR Rch

LCD DRIVER

LCD

MAIN

TAPE MECHA.

IC5

IC2 IC4, Q151

IC3,Q150

SP OUT

PAN IN SW ACC DET.

P-CONT.

IC1

FM+B

Q200,201

AM+B

Q202,203

AM BPF

FM BPF

Q320

Q50

Q350-353

Q53

SW 5V

Q54-57

COM+B

Q58-61

ILLUMI.

B.U. 5V

Q51,52

SYSTEM u-COM

RST SW

Q301

MOTOR SW

RST

Q260,261

ED1 Q1

FM ANT

AM ANT

RF GND

FM+B

AM+B

OSC GND

PLL +B

IFC OUT

SDA

SCL

DIG GND

IF1+B

IF1 GND

S-METER

IF2 GND

FM+B

SW5V

ACC DET

B.U. DET

SCL

MUTE

SDA

P CON

PANEL

HOLD

L CLK

L DATA S

L DATA L

FWD/REV

MOTOR

Rch

COM

Lch

MP IN

MPX

OUT RR

OUT LR

OUT RF

LEVEL

SCL

SDA

OUT LF

STBY

MUTE

Rch

Lch

T-MUTE

FWD

REV

B.U.5V

B.U.

8V B.U.

S MUTE

B.U.5V

AM+B

VDD 5V

PACK IN

L RES

ANT CON

BEEP

SVR

AMP. STBY

SVR

AC GND (BEEP)

Rch

Lch

RF GND

OSC GND

IF2 +B

AUDIO OUT

S-METER

PLL CLK

PLL DATA

PLAY

HEAD

55.6mV

B.U.5V

SW5V

B.U.5V

AM: 170mV

FM: 400mV

TAPE

PACK IN

(FF/REW)

AMP. MUTE

FF/REW

B.U.5V

ILLUMI.

(X16- )

(X14- )

D200

P-CONT.

/ANT-CONT.

KRC-2902YA/G

● SYNTHESIZER UNIT (X14-6872-73)

COMPONENTS DESCRIPTION

Ref.No. Function Operation

IC1 SYSTEM µ-COM Controls the unit.

IC2 E -VOLUME Controls the volume and selects source.

IC3 M UTE LOGIC Controls the mute output.

IC4 POWER AMPLIFIER For the speaker output.

IC5 EQUALIZER AMPLIFIER For the cassette tape's signal.

IC6 RESET Resets the power.

Q49 A CC DETECTION SW Outputs "H" during the ACC off.

Q50 BACK-UP DETECTION SW Outputs "H" when the back-up voltage is under 9.2V.

Q51,52 BACK-UP 5V DRIVER Works when back-up current exists.

Q53 P.ON 5V SW Works during the power on.

Q54,55 8V SW Works during the power on.

Q56,57 8V DRIVER Works during the power on.

Q58,59 ILLUMI +B SW Works during the power on.

Q60,61 ILLUMI +B DRIVER Works during the power on.

Q150 E-VOL MUTE SW

Works when the back-up current is detected or the changer mute works or system

-com mute works.

Q151

SVR FORCED DISCHARGE SW

Works when the amplifier mute works.

Q201 FM +B SW Works during FM mode.

Q203 AM +B SW Works during AM mode.

Q260 MOTOR +B SW Works during the tape mode.

Q261 MOTOR +B DRIVER Works when Q206 works.

Q301 CD-CH RESET SW Works when the power is reset and the reset SW works.

Q320 PANEL 5V SW Works when the back-up current exists and the panel is attached on the unit.

Q350 P.CON DRIVER SW Does not work during the power off and the ALL OFF.

Q351 P.CON PROTECTION SW Works when the P.CON is short-circuited on the GND.

Q352

P.CON PROTECTION INHIBIT SW

Inhibits the protection SW in a moment during the P.CON on.

Q353 P.CON DRIVER SW Does not work during the power off and the ALL OFF.

KRC-2902YA/G

● µ-COM (IC1 : X14-)

Pin No.

Pin name I/O Description

Processing Operation

1 PANEL I Panel detection. "L" : Panel exists.

2 L CE O LCD driver chip enable. -

3 L RES O LCD driver reset. -

4 AVSS - GND. -

5 R DATA I RDS data. -

6 R QUAL I RDS receiving. -

7 AVREF 1 - Reference voltage. -

8 I C2 SEL 1 I Selector. "L" : Normally.

9 I C2 SEL 0 I Selector. "L" : Normally.

10 - - - -

11 L DATA L I LCD driver communication data. -

12 L DATA S O LCD driver communication data. -

13 L CLK O LCD driver communication clock. -

14,15 - - - -

16 DATA C I Changer communication data. -

17 DATA H O Changer communication data. -

18 CH CLK I Changer communication clock. -

19-26 - - - -

27 MOTOR O Cassette tape motor SW. -

28 FF/REW I Cassette tape FF/REW detection. "L" : FF or REW works.

29-31 - - - -

32 SD I Signal detection. "H":Signal exists. "L" : Signal does not exist.

33 VSS 1 - GND. -

34 - - - -

35 PLL CLK O Front-end communication clock. -

36 PLL DATA I/O Front-end communication data. -

37 AM +A O AM power supply SW. -

38 FM +B O FM power supply SW. -

39 IC2 DATA I/O E-volume communication data. -

40 IC2 CLK O E-volume communication clock. -

41 AFC O FM noise detection /Time constant SW. -

42 MUTE O Mute control. -

43 AMP MUTE O Power amplifier mute. -

44 - - - -

45 CH CNT O Changer control. -

46 REQ H O Changer request. -

47 - - - -

48 SVR O SVR control. -

MICROCOMPUTER'S TERMINAL DESCRIPTION

KRC-2902YA/G

Pin No.

Pin name I/O Description

Processing Operation

49 AMP STBY O Power amplifier stand-by. -

50 BEEP O Buzzer signal output. -

51,52 - - - -

53 P.CONT O Power control SW. -

54 ACC DET I ACC detection. -

55 B.U.DET I Back-up detection. -

56 P.ON O Power SW. -

57 ILLUMI O Illumination SW. -

58 FWD/REV I Cassette mechanism FWD/REV detection. -

59 - - - -

60 RESET I System reset signal input. -

61 SEL 1 I Destination SW. -

62 R CLK I RDS clock. -

63 REQ C I Changer request. -

64 PACK IN I Cassette tape pack-in detection. -

65 KEY-REQ I Key signal input detection. -

66 SEL 0 I Destination SW. -

67 VSS 0 - GND. -

68 VDD 1 - 5V power supply. -

69 X2 - Main system clock. -

70 X1 I Main system clock. -

71 IC - GND. -

72 - - - -

73 XT1 - 5V power supply. -

74 VDD 0 - 5V power supply. -

75 AVREF 0 I A/D converter reference voltage. -

76 S METER I S-meter detection. "H" : S-meter exists. "L" : S-meter does not exist.

77 PHONE I - Navigation mute : 2.5V or more.

Telephone mute : 1V or less.

78 NOISE I FM noise detection. -

79 AV CONT O A/D converter reference voltage. -

80 - - - -

MICROCOMPUTER'S TERMINAL DESCRIPTION

KRC-2902YA/G

TEST MODE / ADJUSTMENT

(2-LINE TAPE)

(FWD)

(RVS)

HEIGHT

(FWD)

HEIGHT/AZIMUTH

(FWD) HEIGHT/AZIMUTH

(RVS)

TAPE SPEED

HEIGHT

(RVS)

F''

1. How to enter the test mode

• Reset the unit while holding the "FM" key and preset "6" key.

• All indication segments go ON at the beginning of the test

mode.

2. How to release the test mode

• Simply reset the unit.

• (NOTE) The test mode is not canceled by ACC OFF, power

OFF, momentary power down or the panel off.

3. Audio adjustment

• Set the volume level to -10dB (which is shown as "30" on the

display).

• Loudness OFF.

• The BASS/TREBLE and BALANCE/FADER can be set to

the full-boost/full-cut and full-front/full-rear each by pressing

the "Track UP" / "Track DOWN" keys.

• Sound coordination doesn't appear for the feed.

TEST MODE

ADJUSTMENT

Head Angle Adjustment

Head height alignment procedure

• During FWD transport adjust screws Fand F' so that line A

of 2-LINE TAPE passes trough the center of the head shield

plate (core center area)

• During RVS transport adjust screws Rand R' so that line B

of 2-LINE TAPE passes trough the center of the head shield

plate core (center area)

• After the alignment above, reverse the transport direction

and check the FWD alignment again. If it is deviated,

perform alignment again. (Tape used : SCC-1659,

manufactured by A-BEX)

ABCDEFGHIJ

PC BOARD (FOIL SIDE VIEW)

(COMPONENT SIDE VIEW) (FOIL SIDE VIEW)

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

4.3320MHz

W24

W64

W76

W78

R200

R202

W36

R55

W73

W69

W12

W99

R67

W58

W104

R350

R370

W67

W57

W70

C209

L10

W66

W68

W72

W71

W85

W80

W39

W42

W45

W48

W50

W101

W102

W200

R51

R65

R351

R353

R66

C50

C17 C18

C160

C152

C55

W15

C15

C16

C161

C350

C352

C503

C162

C500

C450

C451

C150

C159

C56

C58

C53

C57

W97

W98

W103 W53 W43

W51 W28

W10

W17

R501 W3

R502

R500

R261

R260

C402

C400

C401

W54

W47

W95

W93

W89

R119

W13

W61

W62

W14

C9 C250

C10

W33

W23

W27

W30

W32

W37

W26

W55

W56

R263

R262

W22

W77

W63

W65

W21

R252

W105

W52

W100

W94

W96

W92

W91

W90

W87

W59

W60

W20

W25

W29

W31

W35

W19

W11

W82

W79

W83

W40

W38

W41

W84

W81

W34

W18

W49

W46

W44

R120

W88

W74

W75

4.19MHz

S-MTR

PDA

PCK

2DA

CCK

DTH

DTC

CMP

2CK

RES

L8 L7

R100

L12

R107

1576109

2 3 4 8 12 11 13

BEBE

111

212

BE BE

Q60

Q56

D370 D410

D50

D405

D371

D352

Q51

Q350

D380

D401

D400

D56

D52

D51

D55

D54

D408

D409

D350

D351

D53

Q261

Q201

Q203

D404

D200

D260

IC5

D261

IC4

D150

D152

D151

WH1

D100

CN1

X14-6872-73 (J74-1319-02)

W170

C251

R156

R15

W158

R14

R62

W159

R57

R59

W157

R60

C52

C163

R161

R159

R162

R16

R13

W174

R381

C380

R61

R251

R151

C214

R503

C600 C601

W171

R125

R123

C13

C14

R58

R52

R54

R106

R112

C164

R352

C154

C153

C351

TH1

R504

R155

R154

R153

R322

R401

R400

R380

R408

R409

R407

R406

R412

R410

R411

R303

R302

R304

R306

R305

R403

R301

R402

C504

C54

C502

C505

R63

R64

W162

C501

R201

R203

R150

W153

C452

C202

C204

R455

R453

R454

R451

R450

R452

R205

R141

R382

C157

R111

R113

R404

R103

R108

C151

C156 C155

R160

R206

R207

C158

C506

R133

R323

R110

R158

C101

C102 R105

C103

W161

W160

R48

R320

R321

R140

W173

W154

R124 R122

R118

R152

R121

R117

R157

R405

R143

R104

W169

W168

W167

R3 R250

W165

R49

R413

W156

R142

W166

W164

R101

R102

C104 W163

114

1528

814

16 9

BEBE

BE BE BE

BE BE

Q61

IC1

Q52

Q59

Q58 Q57

Q153

Q151

Q150

Q55

Q49

Q54

Q53

Q50

Q500

Q502

Q501

Q353

Q301

Q320

Q352

Q351

IC6

IC7

Q451

Q450

Q260

IC3

IC2

Q503

PL1 PL2

AUD

RST654321ATT

VOL

SRC

1 54

CLK

D15

D10

D11

D12

D13

D14

X16-1512-7x (J74-1300-02) X16-1512-7x (J74-1300-02)

R2 R3

R21

R10

R11

R12R13

R14

R15

R17

R18

2441

64 65 80

40 25

BEQ1

IC1

D17

Ref. No address

IC1 3J

Q1 4J

X16-1512-7x

Ref. No

address

Ref. No

address

IC1

Q59

IC2

Q60

IC3

Q61

IC4

Q150

IC5

Q151

IC6

Q201

Q49

Q203

Q51

Q261

Q50

Q260

Q52

Q301

Q53

Q320

Q54

Q350

Q55

Q351

Q56

Q352

Q57

Q353

Q58

X14-6872-73

SYNTHESIZER UNIT SWITCH UNIT

ABCDEFGHIJ

AM+B

AUDIO OUT

S-METER

IF1+B

18 VDD 5V

IF2+B

SDA

SCL

DIG GND

OSC GND

PLL+B

IFC OUT

OSC GND

FM ANT

AM ANT

RF GND

FM+B

2RF GND

16 15 14 13 12 11 10 9

876543 2 1

FL+

RL+

FL-

RL-

FR-

RR-

FR+

RR+

P-ANT

P-CON

ACC

B.U

GND

C50 3300u16

0.01

3.3K 1/2W

33K

R52

10K

R54

R370 4.7K

R350 4.7K

R351 1K

R352

3.3u25

C350

22K

C351

0.1u50

C352

0.068

100u10

C159

C160

10u16

R152 1K

R151 4.7K

91K

R153

180K

C162 1u50

R157 100

R158 33K

R155 430

R156

0.01

C151

47u10

C150

L3 4.7uH

0.1

C158 R150 4.7K

0.1

C155

C153 0.015

C154 0.22

0.033

150P

C157

C156

0.22

24 IF1 GND

IF2 GND

0.01

C202

0.01

C204

22K

R203

22K

R201

R202

R200

R205

150

4.7uH

C209 47u10

0.047

C251 10K

R251

1500P

22K

R1 22K

12 11 10 987654321

PAN 5W

L DATA S

L CLK

L CE

L DATA L

u GND

PAN5V

RESET

ILL GND

ILL +B

ESD GND

R322 2.2K

R301 470

R302 470

R303 1K

R304 1K

27K 47K

R320R321

100u16

C57

R62

100u10

C58

R64

R63

R65

2.2 1/2W

R66

2.2 1/2W

R207 2.7K

R206 4.7K

C56

100u6.35.6K

R61

47K

R60

10u10

R58

22K

100

R59

C55

C54

0.01

100u16

R67

GND

R162 47K

C164

0.01

VDD 14

0.022

120K

100u10 100

100P

R5 6.8K

L IN 8

L NF

L OUT

47u6.3

R250

120K

C250

100u10

R6 6.8K

0.022

C10

100u10 R4

100

GND

VCC

R OUT

100P

R NF

47u6.3

R IN 1

C53

F1 (10A)

R159 100K

AC OUT L

AC OUT R

OUT LF

OUT RF

OUT LR

OUT RR

VDD

GND

SDA

S MUTE

QUAL

MUX R

MUX L

VREF

CREF

TAPE L

TAPE R

CDR

CDGND

CDL

PH-

PH+

MPX

LEVEL

MP IN

MP OUT

C14

C13

52mH

P.O N

B.U.DET

ACC DET

P. CONT

BEEP

AMP STBY

SVR

REQ H

CH CON

AMP MUTE

MUTE

AFC

PLL DATA

PLL CLK

VSS 1

FF/REW

MOTOR

PANEL

L CE

L RES

AVSS

R DATA

R QUAL

IC2 SEL 0

L DATA L

L DATA S

DATA C

SEL 1

R CLK

PACK IN

VDD 1

XT1

VDD 0

S METER

R306 1K

TH1

R323

1/2W

Q151

Q320

10K

Q54,55

Q150

DATA H

CH CLK

IC2 SEL 1

AVREF 1

L CLK

4.7K

R117

R119 2.2K

R120 1K

R121 10K

R123 10K

R122

R124

IC2 CLK

IC2 DATA

FM+B

AM+B

REQ C

KEY-REQ

SEL 0

VSS 0

AVREFO

PHONE

NOISE

AV CONT

R106

2.2K

47K

R105

6.8K

C102

15P

C103

R100

0.022

C104

RESET

FWD/REV

ILLUMI

R55

47K

R57

C52

R353

Q351

T-MUTE

R380

10K

0.01

C380

22K

R381

R104 47K

R140 47K

2.2K

R142 47K

R110 100K

R113

2.2K

R102

L RES R305 1K 3

R49

100K

22K

R48

TAB

RR+

RR-

FR-

FR+

FRI

GND

RLI

RL+

RL-

FL-

FL+

GND 2

STBY 6

VCC 8

GND 10

SVR 12

RRI 14

FLI 16

AC GND 18

GND 20

VCC 22

MUTE 24

GND

4.7K

R14

0.22u50

C16

750

4.7K

0.22u50

C18 R16

4.7K

0.22u50

C15 R13

1u50

0.22u50 4.7K

R15

C17

R154 C161

SCL

1u50

C152

4.7uH

L10

0.01

C214

RL-

YEL

TEL MUTE

BRN

VIOL/BLK

GRN/BLK

RR+

RR-

RL-

VIOL

RL+

GRN

1357

RR+

RL+

FL+

FL-

FR-

RR-

FR+

GND

ACC

P-CON

BLK 1

ANT. CON

P. CON

BLU/WHT

RED

GRY/BLK

WHT/BLK

GRY

FR-

FR+

FL-

WHT 8FL+

R261

R262 47K

GND 1

PACK IN 2

1/2W

R260

10K

47K

R263

GND 5

MOT 3

MOT 4

T.MUTE 6 28

GND

IC4

Q58,59

Q60,61

Q301

Q261

Q350,353

Q352

Q51,52

Q56,57

47K

R252

R382 47K

R51

47K

R133

4.19MHz

100K R111

R112

W200

4.7uH

C101

0.01

+B+B

+B+B+B

+8V +8V

+5V

+8V+8V+8V

+8V +8V +8V

+5V

+5V +5V

+5V

+8V+8V

+8V

+5V

+5V+5V+5V

+5V

P5V

P5V P5V P5V P5V P5V

+5V

IC3

IC5

KRC-2902YA/G (1/2)

SYNTHESIZER UNIT (X14-6872-73)

IC4

IC2

IC1

IC6

(E30-4790-05)

DC1

47K

22K

47K

10K

47K

10K

22K

47K

22K

47K

22K

10K

47K

D50

D261

D52 D51

Q50

D351

D370

ANT-CON.

Q350

Q351

D352

Q353

Q352 Q151

D150

D152

D151

Q150

Q201

D200

Q203

ANT

CN1

Q320

Q55

Q54

D55

Q56

Q57

Q301

Q53

Q52

Q51

D53

D54

Q58

Q60

Q61

Q59

D56

IC1 :

IC2 : TDA7400D

IC3 : HD74HC27FP

UPD780058GC425

IC4 : TDA7386

IC5 : LA3161

Q49,50,52,57,61 : 2SC2412K or

2SD601A

Q51,261 : 2SB1443

Q53 : 2SA1036K

Q54,58 : DTC144EK or

KRC104S

UN2213 or

Q55,59,352 : DTA124EK or

UN2112 or

Q56,60 : 2SA2057 or

2SB1548(P) or

Q201,203,350 : 2SB1277(Q,R)

Q301 : DTA144EK or

UN2113

Q320,351 : 2SA1037K

D50 : 1N5393G-M6 or

S2V20∗A

D51 : MA4068(N)-M or

HZS7A3L

D52,200 : MA4051(N)-M

D53,260,261,351,370,371

:AM01Z or

ERA15-01

D54 : MA4056(N)-M

D55 : MA4091(N)-M

D56 : MA4110-L

D100,150-152,352

: 1SS133

X16-

2/2

D371

Q150 UN2212 or

DTC124EK or:

Q151,260,353 UN2214 or

KRA103S

2SB1655(E,F) or

2SB1565(E,F)

KRC103S

KRC107S

DTC114YK or:

ILLUMI

+B SW

ILLUMI

+B DRIVER

DRIVER SW

P.CON PROTECTION SW

P.ON

5V SW

SYSTEM u-COM

DISCHARGE SW

PANEL 5V

DRIVER

EQUALIZER

AMPLIFIER

E-VOLUME

FM+B

AM+B

TUNER

E-VOL

MUTE SW

Q49

P-CON.

P.CON

SVR FORCED

DETECTION

ACC

D380

D100

PST9135NRIC6 :

MOTOR

+B SW

Q260

MOTOR+B

DRIVER

D260

WH1

Q261

MUTE LOGIC

POWER

ANPLIFIER

RESET

CD-CH

P.CON PROTECTION

INHIBIT SW

BACK-UP

5V DRIVER

SW DETECTION

BACK-UP

DSM1SD2 or

D380 MA4047-M:B LINE

GND LINE

SIGNAL LINE

1.3V

0.8V

3.5V

8.0V

3.5V

0.8V

1.3V

0V 4.4V

0V 5V

4.0V

5.0V

0V 3.5V

8.0V

4.0V

0V 5V

5.0V

0V 5V

5.0V

0V or 5.0V

0V 5V

0.9V

0V or 5.0V

5.0V

0V 4V

1.6V

14.4V

4.8V

7.3V

7.2V

3.3V

14.4V

7.3V

7.2V

7.3V

0V 2.5V

5.0V 0V 4V

5.0V

+B+B

126

345

ME1 (D40-1136-05)

HD1

S1 S2

FWD/REV

GND

HEAD R

HEAD COM

HEAD L

T.MUTE

GND

MOT GND

MOT+B

GND

PACK IN

Lch

FWD

REV

Rch

Ref.99

345

CAUTION : For continued

safety, replace safety critical

components only with manu-

facturer's recommended parts

(refer to parts list).

Indicates safety critical

components. To reduce the

risk of electric shock, leakage-

current or resistance measure-

ments shall be carried out

(exposed parts are acceptably

insulated from the supply cir-

cuit) before the appliance is

returned to the customer.

• DC voltages are as mea-

sured with a high imped-

ance voltmeter. Values may

vary slightly due to varia-

tions between individual

instruments or/and units.

KLMNOPQRST

+5V +5V

+B +B

PANEL SW

L-DATA S

L-CLK

L-CE

L-DATA L

L-RES

u-GND

PAN 5V

RST

ILL-GND

ILL+B

ESD-GND

KS6

KS5

KS4

KS3

KS2

KS1

COM3

COM2

COM1

S55

S54

S53

S52

S51

S50

S49

S48

S47

S46

S45

S44

S43

S42

S41

S40

S39

S38

S37

S36

S35

S34

S33

S32

S31

S30

S29

S28

S27

S26

S25

KEY

S10

S11

S12

S13

S14

S15

S16

S17

S18

S19

S20

S21

S22

S23

S24

KI1

KI2

KI3

KI4

KI5

VDD

VDD1

VDD2

VSS

TEST

OSC

RES

DATA L

DATA S

KI1

KI2

KI4

KI3

C3 0.047

C1 1000P

C2 0.047

R7 56K

C4 0.01

R21 4.7

R8 1K

R9 47K

R6 100

R3 100

R5 100

R4 100

R2 1K

KS5

KS4

KS3

KS2

KS1

PL2 PL1

R18

470

R15

470

R14

330

R13

R12

330

R10

470

R11

330

KS1

KS2

KS3

KS4

KS5

KI4

KI3

KI2

KI1

S19

S18

S17

S16

S15

S14

S13

S11

S10

S12

COM3

COM2

COM1

S55

S53

S54

S51

S52

S49

S50

S48

S46

S47

S45

S44

S43

S42

S41

S40

S39

S38

S37

S36

S35

S34

S33

S32

S31

S30

S29

S28

S27

S26

S25

S23

S22

S21

S20

R17

0V 5V

5.0V

3.3V

1.7V

5.0V

3.3V

1.7V

3.3V

B LINE

GND LINE

J1 Q1

CLK ATT

AM6

VOL+

FMAUDIO

D14 : ∗

D1-13,15 : ∗

Q1 : DTA114EK

IC1 : LC75883E

X14-

1/2

LCD DRIVER

DETECTION

PANEL

AUTO VOL-

T.UP

T.DOWN

SRC

∗

ED1

RST

∗D14

∗D12

∗D9

∗D6

∗D4

∗D1

∗D15

∗D13

∗D10

∗D7

∗D5

∗D2

∗D11

∗D8

∗D3

D17

: MA3062-MD17

IC1

SWITCH UNIT (X16-1512-7X)

KRC-2902YA/G (2/2)

LCD

10K

2-71

MODEL NAME

KRC-2902YA

UNIT No.

2-70

KRC-2902YG

(X16-1512-7X)

B30-1566-05

D1-13,15

B30-1565-05 B30-1511-05

D14

B30-2025-05 B38-1099-05

ED1

B38-1037-05

CAUTION : For continued safety, replace safety critical components

only with manufacturer's recommended parts (refer to parts list).

Indicates safety critical components. To reduce the risk of electric

shock, leakage-current or resistance measurements shall be carried

out (exposed parts are acceptably insulated from the supply circuit)

before the appliance is returned to the customer.

• DC voltages are as measured with a high impedance voltmeter.

Values may vary slightly due to variations between individual

instruments or/and units.

2SB1565

DTA114EK

DTA124EK

DTA144EK

DTC114YK

DTC124EK

DTC144EK

KRC103S

2SA1036K

2SC2412K

2SB1548

2SB1277

2SB1443

2SA1037K

KRA102S

KRC104S

LA3161

KRC-2902YA/G

EXPLODED VIEW (MECHANISM)

Parts with the exploded numbers larger than 700 are not supplied.

101

115

111

102

103 111

102

114

112

113

626

HD1

100

106x2

M1 20

105x2 113

112

19 102

104

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