Kenwood KRC-608, KRC-678R Service Manual

PWR OFF

TI

LOUD

VOL ADJ

MENU

DISP NAME.S

SCANB NR B.S/RDM REP

D.SCN

MTL/M.RDM

DISC

PROG/PTY

DAB

EJECT

AUD

KRC-678R

45W 4

X

KRC-608 KRC-678R/RY/RV/RYV

CASSETTE RECEIVER

SERVICE MANUAL

C

2000-3 PRINTED IN KOREA

B51-7597-00 ( K ) 3117

EJECT

PWR OFF

LOUD

MENU

AUTO

AME

DISP

NAME.S

SCANB NR B.S/RDM REP

D.SCN

MTL/M.RDM

DISC

DAB

AUD

KRC-608

45W 4

X

PROG

Front glass assy (B10-3204-08)

Escutcheon assy (B07-2195-08)

Panel assy (A64-2087-08)

Lever (D10-4514-08)

Mounting hardware assy (J21-9585-08)

DC cord assy (E30-4860-08) : KRC-608 only

Plastic cabinet assy (A02-1494-08)

The CASSETTE MECHANISM OPERATION DESCRIPTION is the same model D40-1122-05. Please refer to the service manual for model D40-1122-05(B51-7452-00).

Stay (J54-0611-08) : KRC-608 only

Escutcheon (B07-2186-08) : KRC-608 only

Screw set (N99-1689-08) : KRC-608 only

Screw set (N99-1688-08)

KRC-678R

KRC-608

Panel assy (A64-2088-08)

Front glass assy (B10-3205-08)

Escutcheon assy (B07-2195-08)

DC cord assy (E30-4861-08) : KRC-678R/RY /RV/RYV

ANT adapter (T90-0523-05) : KRC-678R/RY /RV/RYV

40%

2

TUNER

ANT

SGS-IC

E PROM

E-VOL

TDA7400D

NOISE AMP

TDA7401D

H.P.F

POWER IC TDA7386

EQ-AMP

UPD784217AGF504

u-COM

CD-CH

RST

LCD-Dr

LC75808E

REMO

KEY MATRIX

LCD

BU 5V

SW 5V

PNL 5V

AUDIO 8V SW 14V

MOTOR 14V

ILL 11V

BU 14V

TDA7479D

RDS DETECTOR

SERVO 14V

CXA2560Q

MOTOR-Dr BA6219BFP-Y

CASSETTE

TU100

IC200

IC300

IC150

IC301 IC500

Q610

Q621

Q616

Q612

Q618

Q622

Q5

Q1

IC900

IC1

IC250

MECHA (D40-1141-08)

FRONT

REAR

FRONT

REAR

FRONT

BU 5V

SW 5V

PNL 5V

AUDIO 8V

MOTOR 14V

ILL 11V

FM

AM

CASS

CD-CH

REAR

FRONT

10K

REAR/NF

2

NF

SERVO 14V

KRC-678RV/RYV

USED KRC-788

KRC-608

KRC-678RV/RYV

KRC-678R/RY

KRC-788

USEDUSED

KRC-788/678R/RY/678RV/RYV/608

USED

E: KRC-678R/RY/RV/RYV

KRC-608K: KRC-788M:

CD-CH

CASS

FM(K,M) AM(K,M)

310mV

1200mV

FM(K,M) 400Hz 75KHz Dev

CASS 1KHz 0dB

AM 400Hz 30% Mod

FM(E) 400Hz 40KHz Dev

CD-CH 1KHz 0dB

CD-CH

CASS

AM(K,M)

FM(K,M)

N/F

CASS

AM(E)

AM(K,M)

FM(E)

FM(K,M)

CD-CH

(E)

(K,M)

(E)

(K,M)

FM(K,M)

CASS

FM(E) AM(K,M) AM(E)

CD-CH

FRONT

REAR

CD-CH

CASS

AM(E)

AM(K,M)

FM(E)

FM(K,M)

: 730mV

: 560mV

: 1280mV

: 1660mV

: 2900mV

: 1490mV

: 1370mV

: 670mV

: 1180mV

: 2650mV

: 510mV

: 1530mV

: 1370mV

: 1180mV : 670mV

: 1530mV : 510mV

: 170mV

: 350mV

: 150mV : 140mV

: 1530mV : 510mV

: 2650mV

: 1300mV

: 840mV : 2200mV

: 310mV

: 950mV

CASS

AM(E)

AM(K,M)

FM(E)

FM(K,M)

CD-CH

: 1280mV : 560mV : 730mV : 1490mV : 2900mV

: 1660mV : 1660mVFM(K,M)

CD-CH

FM(E) AM(K,M) AM(E) CASS

: 2900mV

: 1490mV

: 730mV

: 560mV

: 1280mV

CASS

AM(E)

AM(K,M)

FM(E)

FM(K,M)

CD-CH

: 1280mV : 560mV : 730mV : 1490mV : 2900mV

: 1660mV

KRC-608,678R/RY/RV/RYV

BLOCK DIAGRAM

KRC-608,678R/RY/RV/RYV

MICROCOMPUTER'S TERMINAL DESCRIPTION

784217AGF503(504)(IC1 : MAIN UNIT)

Pin Pin Name Signal Name I/O Purpose Operation Description

1 P60/A16 ST_TYPE1 I E-VOL setting selection input DEFAULT:LO 2 P61/A17 ST_TYPE2 I E-VOL setting selection input DEFAULT:LO

3 P62/A18 JS_TYPE1 I 4 P63/A19 TYPE1 I Destination type switching input 1

5 P64/RD TYPE2 I Destination type switching input 2 6 P65/WR TYPE3 I Destination type switching input 3 7 P66/WAIT NC O Not used 8 P67/ASTB NC O Not used 9 Vdd - Positive power supply pin

10 P100/TI5/TO5 AMP_SVR O Power IC reset control Power ON: Lo. 11 P101/TI6/TO6 AMP_STBY O Power IC standby control 12 P102/TI7/TO7 AMP_MUTE O Power IC muting control Muting ON: Lo. Muting OFF: Hi.

13 P103/TI8/TO8 NC O Not used 14 P30/TO0 ACC_DET I Acc detection input ACC OFF:HI ACC ON:LO 15 P31/TO1 BU_DET I B-U detection input B-U down: Hi. B-U normal: Lo. 16 P32/TO2 SMALL I Small input Dimmer ON: Lo. Dimmer OFF: Hi. 17 P33/TI1 P_CONT O Power control ON:HI OFF:LO 18 P34/TI2 P_ANT O Power antenna control TUNER: Hi. Other sources: Lo. 19 P35/TI00 REMO I Remote control input 20 P36/TI01 P_ON O Internal power control ON:HI OFF:LO 21 P37 ILL_ON O LED lighting control output Lighting ON: Hi. Lighting OFF: Lo. 22 TEST - IC test pin 23 P90 IC2_SDA I/O E-VOL/E's + data input/output 24 P91 IC2_SCK O E-VOL/E' + clock output 25 P92 MUTE O Muting control Muting ON: Hi. Muting OFF: Lo. 26 P93 SW5V O SW 5 V control ON:LO OFF:HI 27 P94 F/E_DATA I/O IC3 data input/output 28 P95 F/E CLK O IC 3 clock output 29 P120/RTP0 CH_CON O CH control ON:HI 30 P121/RTP1 CH_REQH O CH send request output Requested: Lo. 31 P122/RTP2 NC O Not used 32 P123/RTP3 NC O Not used 33 P124/RTP4 C-MAIN_M O C-mechanism main motor control ON:HI OFF:LO 34 P125/RTP5 C-SUB_M+ O C-mechanism loading motor control 35 P126/RTP6 C-SUB_M- O C-mechanism loading motor control 36 P127/RTP7 NC O Not used 37 Vdd - Positive power supply pin 38 X2 - Main system clock oscillator pin 39 X1 - Main system clock oscillator pin 40 Vss - GND pin 41 XT2 - Sub-system clock oscillator pin 42 XT1 - Sub-system clock oscillator pin 43 RESET I System reset input pin 44 P00/INTP0 NC O Not used 45 P01/INTP1 RDS_CLK I RDS clock input 46 P02/INTP2/NMI CH_REQC I CD-CH send request input Requested: Lo. 47 P03/INTP3 LCD_DATAL I Data input from LCD driver 48 P04/INTP4 C-MODE_1 I C-mechanism mode detection 1 input 49 P05/INTP5 C-MODE_2 I C-mechanism mode detection 1 input 50 P06/INTP6 C-MODE_3 I C-mechanism mode detection 1 input

Genuine/generally-marketed identification

input.

DEFAULT:LO

Standby canceled: Hi. Standby mode: Lo.

3

KRC-608,678R/RY/RV/RYV

MICROCOMPUTER'S TERMINAL DESCRIPTION

784217AGF503(504)(IC1 : MAIN UNIT)

Pin Pin Name Signal Name I/O Purpose Operation Description

51 AVdd - A/D analog power pin 52 AVref0 - A/D reference voltage input pin

53 P10/ANI0 PHONE I PHONE detection input 54 P11/ANI1 NC I Not used

55 P12/ANI2 NOISE I FM noise detection input 56 P13/ANI3 S-METER I FM S-meter input 57 P14/ANI4 NC I Not used 58 P15/ANI5 NC I Not used 59 P16/ANI6 REEL_S I C-mechanism supply reel detection 60 P17/ANI7 REEL_T I C-mechanism take-up reel detection 61 AVss - A/D and D/A GND pin 62 P130/ANO0 NC O Not used 63 P131/ANO1 NC O Not used 64 AVref1 - D/A reference voltage input pin 65 P70/RxD2/SI2 CH_DATAC I Data input from CD-CH 66 P71/TxD2/SO2 CH-DATAH O Data output to CD-CH 67 P72/ASCK2/SCK2 CH_CLK I/O CD-CH clock input/output 68 P20/RxD1/SI1 LCD_DATAL I Data input to LCD driver 69 P21/TxD1/SO1 LCD_DATAS O Data output from LCD driver 70 P22/ASCK1/SCK1 LCD_CLK O Clock output to LCD driver 71 P23/PCL NC O Not used 72 P24/BUZ BEEP O Beep output 73 P25/SI0 NC O Not used 74 P26/SO0 PNL_DET1 I Panel detection 75 P27/SCK0 NC O Not used 76 P80/A0 LCD_INH O Reset output to LCD driver 77 P81/A1 LCD_CE O CE output to LCD driver 78 P82/A2 SRT_SW1 I SRT position detection input 79 P83/A3 SRT_SW2 I SRT position detection input 80 P84/A4 NC O Not used 81 P85/A5 NC O Not used 82 P86/A6 NC O Not used 83 P87/A7 C-MSC O EQ amp FF/PLAY control PLAY:HI OFF:LO 84 P40/AD0 C-F/R O Tape transport direction switching FWD:LO REV:HI 85 P41/AD1 C-MUTE O Tape muting control MUTE:HI 86 P42/AD2 C-MS_IN I Inter-music pulse detection 87 P43/AD3 C-MTL O MTL ON/OFF control ON:HI OFF:LO 88 P44/AD4 C-NR O Dolby ON/OFF control ON:HI OFF:LO 89 P45/AD5 NC O Not used 90 P46/AD6 NC O Not used 91 P47/AD7 RDS_DATA I Data input from RDS decoder 92 P50/A8 RDS_QUAL I Quality input from RDS decoder

93 P51/A9 AFC O PLL high-speed lock-up pin 94 P52/A10 FM/AM_SD I FM/AM SD input Station detected: Hi.

95 P53/A11 IF_COUNT I Not used 96 P54/A12 NC O Not used 97 P55/A13 AM+B O AM power control ON:HI 98 P56/A14 FM+B O FM power control ON:HI 99 P57/A15 NC O Not used

100 Vss - GND pin

<1 V: PHONE. >

2.5 V: Navigation muting.

During reception: Hi. During search: Lo.

4

KRC-608,678R/RY/RV/RYV

TEST MODE

(1) How to enter the test mode

While holding the FM and Preset 6 keys simultaneously, reset the unit. All indicators and display segments are ON at the start of test mode.

(2) How to exit from the test mode

Reset the unit. (Note) The test mode cannot be canceled by turning Acc OFF, power OFF or momentary power down.

(3) (return to beginning)

Pressing the Track Down key jumps to the previous track to the track being played.

(4) Test mode specification of the tape

o The Blank Skip is initially OFF.

(5) Audio

o The volume is -10 dB (displayed as 30). o LOUD is OFF, and CRSC is also OFF whether the

function is provided or not.

o With the Bass/Treble and Balance/Fader controls,

pressing the Up/Down key switch the setting alternately to: Full Boost => Full Cut => Full Boost, Full Right -> Full Left => Full Right, or Full Front ~> Full Rear => Full Front.

o With the high-pass filter, pressing the Up key sets it to

Through/100 Hz/200 Hz and pressing the Down key sets it to 200 Hz/100 Hz/Through.

o Other adjustments function in the same way as normal

mode.

(6) Backup current measurement

When the unit is reset (backup turned on) while Acc is OFF or when Acc is turned OFF in test mode, the MUTE terminal goes on in 2 seconds, instead of 1.5 second. (The panel, CD, C and MD mechanisms are not activated at this time.)

Example: To enter "3510",

- Press the Preset 1 key 4 times.

- Press the Preset 2 key 6 times.

- Press the Preset 3 key 2 times.

- Press the Preset 4 key once.

7. Press and hold the DISPLAY key for 3 seconds to display "APPROVED".

8. Quit the test mode (See (2) How to exit from the test mode.)

(8) How to clear the simple security code (K type only)

1. While the code is requested, press and hold the DISP key and press and hold the VOL Up key for 3 seconds. ("----" disappears.)

2. Enter "KCAR" from the remote control unit. (Same operation as the '98 model)

- Press numeric key 5 twice then press the Track Up key. (This enters "K".)

- Press numeric key 2 three times then press the Track Up key. (This enters "A".)

- Press numeric key 2 once then press the Track Up key. (This enters "A".)

- Press numeric key 7 twice then press the Track Up key. (This enters "R".)

3. The security is canceled and the unit enters the TUNER mode.

(9) Other

o The DNPP/SBF key of the remote control unit (RC-510)

functions as the menu mode ON/OFF key.

o The OPEN/CLOSE key of the remote control unit (RC-

510) functions as the audio adjustment mode ON/OFF key.

o The menu is displayed by displaying only the required

features.

o Message such as "CODE OFF" is not displayed when

power is turned ON.

o The contrast can be adjusted only to 0/5/10 using the

Up/Down keys.

(7) Security code registration after E2PROM replacement

servicing (E/M type only)

1. Enter the test mode. (See (1) How to enter the test mode.)

2. Press the SRC key to set All OFF.

3. Press and hold the AUDIO key for 1 second to enter menu mode.

4. Press the FM/AM key to select "SECURITY".

5. Press and hold the Track Up/Down for 2 seconds.

6. Enter the code by pressing the Preset 1, 2, 3 and 4 keys.

5

KRC-608,678R/RY/RV/RYV

tongue

Turn 4 times.

End of Roller ass’y

FPC

No ITEM

INPUT

SETTINGS

OUTPUT

SETTINGS

TUNER

(RECEIVER)

SETTINGS

ALIGNMENT

POINTS

ALIGN FOR FIG.

CASSETTE DECK SECTION

[1] AZIMUTH

TCC-153

10kHz

Connect a

AC voltmeter

to SP OUT

TAPE PLAY

Head Azimuth

Screw

Adjust the azimuth for each

Lch/Rch or FWD/RVS

becomes maximum

[2]

PLAY BACK

LEVEL

TCC-130

Connect a

AC voltmeter

to CN200

TAPE PLAY

VR200A (L) VR200B (R)

300mV (a)

F/E

CASSETTE MECHANISM

VR200B

VR200A

Rch

Lch

CN200

L G R

(a) 300mV

AC voltmeter

ADJUSTMENT

ATTENTION OF ASSEMBLY

Assembly of FPC(Flexible PC board) onto Roller ass'y Turn Roller ass'y by 4 times. Hook the end of Roller ass'y to the tongue. Insert the FPC into the slit of Roller ass'y then release the end of Roller ass'y and the tongue.

6

C301A

C301B

R350

R102

R104

JC6

JC4

JC2

C601

JC20

JC21

JC18

JC19

JC16

JC30

JC53

JC50

R613

JC11

JC36

JC12

JC17

JC14

JC15

JC33

JC13

JC8 JC7

JC25

JC34

JC37

JC57

JC24

JC22

JC9

JC23

R100

C212

JC10

R351

R605

R253

R23

C253

C606

R44

R45

R37

JC31

JC27

JC28

JC29

C6

C2

R628

JC32

R38

C613 R624

C154

R608

R611

R606

R403

R402

R400

R404

R406

R407

R408

R405

R409

R644

C155

C404A

C10

C404B

R600

R602

C603

C602

R601

R307

C301

C305

C303 C304

R509

C310

R503

R505

C512

R504

R506R502

C214B

C214A

C354

JC5

JC3

TH500

R206

C211

C210

R208

R207

C209

R508

C510

R352B

R352A

R353B

R103

R101

R210A

R211A

C201A

JC35

R201A

R211B

R210B

C201B

R201B

C200B

R200B

C200A

R200A

R106 C151

R105

C104

C109

C107

C105

C102

C100

R353A

R204

R302

R303

C306

R308

R306

R47

R36

R69

R27

C16

C15

R14

R13

R2

R4

R6

R8

R10

R12

C5

R34

R33

C615 R627

R25

R60

R59

R68

R67

R62

R61

C22

C8

JC51

R609

JC26

EB

BE

E

B

3 4

1

2

D507

D506

D501

D402

D403

D404

D6

D5

D405

D608

D614

D8

D7

Q605

Q614

Q3

Q617

Q5

Q600

Q601

Q104

Q101

Q103

Q612

Q606

Q611

Q625

Q615

Q1 Q2

Q303

Q302

Q500

Q621

IC2

R401A

R401B

C400

R643

C624

R354B R354A

R305

C308

C307

R304

R616

R620

R618

C608

C604

JC39

R619

R617

R621

R356B

C206B

C206A

C352A

VR200B

ET1

VR200A

C352B

R355B

R357BR356A

C353B

R355A

R357A

C353A

R603

R615

JC451

JC40

JC52

JC41

C300

JC38

JC42

JC56

JC55

JC54

JW18

JW16

JW15

JC43

C20

R626

C621

R634

C13

R641

C250

C153

C251

C252

R52

R53

C254

R51

R203

JC46

R205

RN3

RN2

R15

R22

R19

R18

R21

R17

R16

R1

R50

C207B

C18

C17

C504A

C505B

C505A

C504B

R65

R20

C502A

C503B

C503A

C502B

C500A

C501B

C501A

R501B

R501A

C500B

R500A R500B

R300

R209

C213

R29

R35

R42

C7

R28

R24

R26

R11

R9

R7

R5

R3

C11

R57

R56

R55

R54

R58

C616

C14

C19

C4

C3

R64

R46

C625

C205B

R202B

R202A

C205A

C207A

R39

R40

C21

C618

JC44

RN400

L1

L100

L102

L105

L104

L106

L103

L300

L105

R629

L101

R625

R252

C402B

C612

C623

C610

C622

C1

C614

C403

C607

C605

C402A

C309

JW1

JW9

JW17

JW10

JW2

JW11

JW13

JW5

JW8

JW7

JW12

JW3

JW4

EBEB

EB

R604

R612

R614

R610

R251

R250

C255

C609

C12

R43

JC47

R254

R255

C507

R32

C506

L600

C600

C508

C509

C350A

C350B

C511

X150

RN1

RN150

RN7 RN6

C208

C204

C103

C106

C108

C101

C150

C152

C110

C351B

C351A

RN4

X2

X1

RN5

R607

C626

JC48

C9

JC6

1

11

10

2

13

25

14

1

14

28

15

1

125

1

24

3

113

1

4

24

31

1

64

52

2

19

253748612101113

8

16

18

17

9

7

1

8

16

9

8

1

5

4

2

10

11

20

21

30

31

40

30

80

51

50

31

81

100

14

BE

EB

BE

D400B

D401

MAIN UNIT

D400A

Q604

Q602

IC3

IC300

IC500

CN350

IC250

IC1

IC200

IC150

Q102

Q100

CN3

CN201

TU100

CN100

CN200

CN1

Q618

Q603

Q607

Q608

Q624

CN250

Q610

Q622

D603

D601

CN400

CN600

D613

D100

D605

D612

D250

D617

D251

D615

D607

D503B

D503A

D502B

D502A

D505A

D505B

D504A

D504B

D606

D610

D300

D604

D600

D350A

D350B

D351

D352A

D352B

Q350B

Q350A

Q351B Q351A

Q616

Q300

Q620

Q301

A BDFHJCEGI

R915

R900

C911

RN901

RN900

R901

R904

R920

R921

C909

122

13

1

R923

C900

R916

R917

R918

R932

R931

R914

R919

C906

C901

C902

C907

C903

C910

C908

C904

C905

R903

R905

R912

R911

R902

R913

R910

R925R929

R926

R927

R928

R907

R908

R930

R906

R909

R922

130

31

50

5180

81

100

BE

EB

IC900

CN900

D922

D921

Q905

Q901

Q902

Q900

Q903

Q904

PROG

EJECT

RST

AM

FM

32

41

SRC

DISP

AUD

654321

1

68

35

36

ATT

VOL-

VOL+

AUTO

D919

D918

CONTROL UNIT

D904

IC901

D902

D907

D905D910

D909

D908D913

D912

D906

D903

S903

S927

S902

S910

S926

S908

S916

S901

S914

S900

S925

S922

S921

S920

S928

S923

S924S906S913

D911

D916

D914

D900

D923

D901

D915

S919

S918

S911

S912

S904

LCD900

S905

S907

S909

S917

S929

S915

D917

S801

S800

14

CN800

SWITCH UNIT

MAIN UNIT

Ref.No. Address Ref.No. Address Ref.No. Address Ref.No. Address

IC1 4E Q100 3F Q351B 2G Q611 4B IC2 4D Q101 3F Q500 3F Q612 5D

IC3 3C Q102 3F Q600 2E Q614 5D IC150 4C Q103 3F Q601 2E Q615 5D IC200 4F Q104 4G Q602 3B Q616 5C IC250 4C Q300 3D Q603 3C Q617 4C IC300 3E Q301 3E Q604 3B Q618 5C IC500 1E Q302 3E Q605 3C Q620 4B

Q1 4C Q303 3E Q606 3B Q621 5A Q2 4D Q350A 2F Q607 3D Q622 5B Q3 5D Q350B 2F Q608 3D Q624 5A Q5 5E Q351A 2G Q610 4B Q625 5B

PC BOARD (Component side view)

1

2

3

4

5

6

7

87

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