Kenwood KRC-335, KRC-565, KRC-365, KRC-465, KRC-465W Service Manual

CASSETTE RECEIVER

KRC-335/565 KRC-365/465/465W

SERVICE MANUAL

● KRC-335

B51-7848-00 (S) 1754

MECHANISM EXTENSION CORD

W05-0477-00 (7P) W05-0609-00 (10P)

Knob(VOL) (K25-1395-03)

SRC

OFF

Knob(SRC) (K24-3820-04)

∗ Refer to the PARTS LIST

Plastic cabinet assy (A02-1486-13)

∗ Panel assy (A64-2532-02)

KRC-335

DOLBY B NR

LOUD B.NR SCAN REP MTL/M.RDMB.S/RDM ADJ AUTO AMECLK

DC cord (E30-4783-05):K (E30-4784-05):M1,M2,M5,M6

Cassette lid (A53-1687-03)

Knob(1-6) (K25-1392-03)

45Wx4

∗ Front glass (B10-4122-01)

Knob(FM/AM) (K25-1393-03)

DISC

CRSC

AUD

Knob(AUD) (K24-3821-04)

Mounting hardware assy (J21-9641-13)

Remote controller assy (A70-2024-05):K,M2

Level (D10-4589-04)

Screw set (N99-1719-05)

Screw set (N99-1610-15)

KRC-335/365/465/465W/565

SW5V

B.U.14V

BU5V

BU14V

FM ANT

AM ANT

FM+B

AM+B

PLL+B

PLL-DATA

VT

IFC OUT

PLL-CLK

VDD 5V

IF2+B

IF1 GND

S-METER

IF1+B

SD

AUDIO OUT

PLL-DATA

SD

S-METER

SUB+

SUB-

EN2

ACC-DET

EN1

SCL

MUTE

SDA

EN3

SW5

PC-DET

PA-DET

PANEL

HOLD

L-CLK

L-CE L-DATA S L-DATA L

MUSIC

*

DOLBY

*

MTL

EQ-MUTE MS-CONT

MUSIC

*

DOLBY

*

MTL

EQ-MUTE

MS-CONT

DSI

FWD/REV

PACK IN

M-STBY

CH CON DATA H DATA C REQ H REQ C CH CLK

Rch

COM

Lch

MP IN

AM

MPX

OUT RR

SW5V

OUT LR

OUT RF

LEVEL

SCL

SDA

OUT LF

SVR

MUTE

EN1

EN2

EN3

P.ANT

P,CON

ILLUM

B.U.5V

AM+B

AUDIO

FM+BFM+B

AM+B

AUDIO 8V

BU5V

Rch

Lch

PACK

T-END

M-STBY

T-MODE

FWD

REV

BU5V

AUDIO 8V

BU14V

CHRST

SMUTE

FM+B

AM+B

AUDIO

8V

AUDIO

8V

MOTOR

BU14V

SW5V

8

4

1040

IN

PLAY HEAD

BU5V

PLL-CLK

T-MODE

T-END

BU5V

REMO

SW5V

BU-DET

P-STBY

SVR

P-MUTE

CHMUTE

STBY

CD L/R

TAPE L/R

1200mV

400mV

170mV

340mV

TAPE

CD-CH

AM

FM

: 1719mV

: 3424mV

: 550mV

: 1727mV

TAPE

CD-CH

AM

FM

:1780mV

:3546mV

:570mV

:1789mV

AUDIO 8V

TAPE L/R

(X16)

(X14)

MM

TUNER

TAPE MECHA

SW5

SYSTEM u-COM

KEY

PAN 5V

MUTE

B.U. DET

SURGE-DET

PA-DETPC-DET

B.U.

ACC

P-CONT

ANT-CON

MUTE

DC CONNECTOR

PRE

POWER IC

EQ AMP

E-VOL

CD/MD

CHANGER

FRONT Lch

FRONT Rch

REAR Lch

REAR Rch

REGULATOR

LCD DRIVER

LCD

MAIN

SUB

F-Lch

F-Rch

R-Lch

R-Rch

PRE OUT

J5/J6

J4

SP OUT

MOTOR

5V

D301

IC6

IC5

IC1

IC2

IC7

TH1

IC10

IC2

AVR

DSI

REMO

RST SW

PAN IN SW

ACC DET

J2

VOLTAGE

DRIVER

AMP

SVR

PC-DET

PA-DET

MUTE

THERMO

PROTECTION

MAIN M

DRIVER

SUB MOTOR

ANT.

BLOCK DIAGRAM

2

KRC-335/365/465/465W/565

COMPONENT DESCRIPTION

● SYNTHESIZER UNIT(X14-6880-XX)

REF.No. FUNCTION OPERATION

IC1 SYSTEM µ-COM Controls FM/AM tuner, the change, cassette mechanism, volume and tone. IC2 E-VOLUME Controls the source, volume, tone and FM multiplex detector. IC4 POWER AMPLIFIER Amplifies the front L/R and the rear L/R to 45W maximum. IC5 EQUALIZER AMPLIFIER Equalizes the tape sound. IC6 SUB MOTOR DRIVER Controls the sub motor. IC7 POWER SUPPLY B.U.:5V, AUD:8V, FM+B:8V, AM+B:8V.

IC10 MUTE CONTROL LOGIC Controls muting.

Q10 BACK-UP DETECTION Output becomes "L" when the back-up voltage becomes more than 9V.

Output becomes "H" when the back-up voltage becomes less than 9V (momentary power down).

Q11 SERGE DETECTION Output becomes "L" when the back-up voltage becomes more than 18V (Momentary

power down). Output becomes "H" when the back-up voltage becomes less than

18V. Q41 PRE MUTE DRIVER When input becomes "L", output becomes "H" (Preout mute). Q50 5V SW Outputs 5V to the SW 5V power supply when input becomes "L". SW 5V power

supply line is cut off when the input becomes "H". Q51 POWER ANTENNA Output becomes "H" when P-ANT output is short-circuited (P-ANT OFF).

DETECTION Output becomes "L" when FM/AM signal does not exist.

Q52 P.CON. DETECTION Output becomes "H" when P.CON output is short-circuited (P.CON OFF).

Q190 PANEL SW Outputs 5V to the panel VDD line when panel is attached.

Panel VDD line is cut off when panel is taken out.

Q191 DSI DRIVER DSI lights when input becomes "L". DSI turns off when input becomes "H".

DSI turns on and off when panel is taken off.

Q221-224

Q251 SVR "L" when input becomes "H". Q501 SUB MOTOR AVR Outputs 7.3V when AUD 8V exists. Output does not exist when AUD 8V does not

Q551 MAIN MOTOR SW Outputs 14V when input becomes "L" (Main motor drives). Q552 MAIN MOTOR SW Output becomes "H" when input becomes "L".

PRE MUTE Works when input becomes "H". Being cancelled when input becomes "L".

exist.

● SWITCH UNIT(X16-1520-XX)

REF.No. FUNCTION OPERATION

IC1 LCD DRIVER Scans LCD display control key. IC2 REMOTE SENSOR Sensors remote controller signal.

Q1 KEY SCAN SW Scans key after receiving imitative key input signal.

3

KRC-335/365/465/465W/565

MICROCOMPUTER'S TERMINAL DESCRIPTION

● (X14-) IC1: µ-COM

PORT No.

PORT NAME I/O FUNCTION OPERATING CONDITION

1 X IN I Clock: 4.5MHz. 2 GND - GND. 3 L-DATA L I LCD driver data. 4 L-DATA S O LCD driver data. 5 L-CLK O LCD driver clock. 6 L-CE O LCD driver chip enable. 7 PANEL I Panel detection. 8 PLL-DATA I/O Tuner data.

9 PLL-CLK O Tuner clock. 10 SD I Tuner band muting. 11 CH-DATA C I 5-line CD-CH communication data. 12 CH-DATA H O 5-line CD-CH communication data. 13 CH-CLK I/O 5-line CD-CH communication clock. 14 CH-REQ C I 5-line CD-CH communication request. 15 MOTOR O Cassette mechanism main motor.

16-20 - - -

21 CH-CON O 5-line CD-CH communication control. 22 CH-REQ H O 5-line CD-CH communication request. 23 MUTE O Muting. 24 IC2-SCL O IC2 clock.

25,26 - - -

27 IC2 TYPE 0 I Model discrimination. 28 - - 29 TYPE 1 I destination discrimination. 30 TYPE 0 I destination discrimination. 31 VDD - Power supply. 32 IC2-SDA I/O IC2 data. 33 SW 5V O SW 5V control. 34 P-MUTE O Power IC muting. 35 P-STBY O Power IC stand-by. 36 SVR O Power IC discharge control. 37 EN1 O Power supply IC control. 38 EN3-1 O Power supply IC control. 39 EN3-0 O Power supply IC control. 40 EN2-1 O Power supply IC control. 41 EN2-0 O Power supply IC control. 42 - - 43 MS-CONT O Tape signal sensitivity switch. 44 BEEP O Beep. 45 BU-DET I Back-up detection. 46 P.CON-DET I Power control short-circuited detection. 47 P.ANT-DET I Power antenna short-circuited detection. 48 MUSIC I Tape signal detection. 49 METAL O Normal/Metal tape switch. 50 DOLBY O Dolby switch. 51 EQ-MUTE O Tape equalizer muting. 52 FWD/REV I Cassette mechanism running direction.

53,54 - - -

55 PACK-IN I Cassette mechanism pack-in. 56 REMOTE I Remote signal shape. 57 - - 58 DSI O Disable System Indicator. 59 SUB+ O Cassette mechanism sub motor. 60 SUB- O Cassette mechanism sub motor.

4

KRC-335/365/465/465W/565

MICROCOMPUTER'S TERMINAL DESCRIPTION TEST MODE / ADJUSTMENT

PORT No.

PORT NAME I/O FUNCTION OPERATING CONDITION

61,62 - - -

63 IC2 TYPE 1 I Model switching. 64 T-MODE I Cassette mechanism mode pulse. 65 ACC-DET I ACC detection. 66 S-METER I Tuner signal meter. 67 HOLD I Clock stop mode. 68 VDD - VDD. 69 M-STBY I Cassette mechanis stand-by. 70 T-END I Cassette mechanism end.

71,72 - - -

73 VDD - VDD. 74-76 GND - GND. 77,78 - - -

79 GND - GND.

80 X OUT O Clock 4.5MHz.

KRC-335/365/465/465W/565

TESTMODE

1. How to enter the test mode

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

• All indication segments should go ON at the beginning of the test mode.

2. How to release the test mode

• Simply reset the unit.

ADJUSTMENT

BALANCE/FADER/BASS/TREBLE : CENTER T.ADV/METAL/DOLBY NR/AUTO : OFF

No. ITEM

CASSETTE DECK SECTION

1 AZIMUTH

DOLBY Connect an VR1 (L ch)

2 (PLAY BACK TCC-130 AC voltmeter TAPE PLAY VR2 (R ch) 300mv

LEVEL) to CN5 (X14-) (X14-)

INPUT OUTPUT RECEIVER ALIGNMENT

SETTINGS SETTINGS SETTINGS POINTS

TCC-153

10kHz (FWD/REV) and “REV” becomes

SP OUT TAPE PLAY

3. Audio adjustment

• Enter the audio mode by pressing the "AUD" key.

• Set the volume level to be +5dB. In that case, "30" should be shown on the display.

• Loudness OFF.

• The BASS/MIDDLE/TREBLE and BALANCE/FADER can be adjusted to the full-boost/full-cut and full-front/ full-rear each by pressing the "UP" and "DOWN" key in 3 steps range.

ALIGN FOR FIG

Head azimuth Adjust so that output

screw level in playing “FWD”

(ME1)

maximum each.

(b)

(b) AZIMUTH

FWD

5

REV

PANEL FRONT

6

A B C D E F G IH

PC BOARD (Component Side View)

1

SYNTHESIZER UNIT (X14-6880-XX)

.ON.feR CIQ 1D5 2D4 4D2

2

5F5 6F6 7G3

01E3

01E3 11E4 14C3 05E4 15E4 25E4

091B5

191E6

3

122B3

222B3

322C3

422C3

152E3

105F6

155C5

255C5

sserddA

4

5

6

SYNTHESIZER UNIT

C308

R197

R230

C222

R199

Q222

R222

D102

R198

J6

R226

EBEB

R221

C301

C305

L307

C309

R552

C104/R106

D103

R187

15

R225

C221

R193

L301

P1

C330

J1

W501

A1

1

W513

C331

24

EB

Q190

Q221

W1

C224

W6/L306

R551

R229

Q224

EB

R224

R301

D301

Q551

Q552

R138

D106

R105

R101

R232

R228

R227

EB

Q223

EB

R223

C223

R188

W3

R123

W2

W4

W5

D551

EB

R555

EB

R139

R103

R104

X14-6880-XX (J74-1320-02)

J4

J5

C225

R409

R411

R231

D404

D409

Q41

W28

W8

W9

W7

7

1

13

R

W10

D108

R194

W101

214

1

R408

D408 D405

D407

C403

W11

W13

R553

CN2

CN5

W14

J3

R410

C401

W15

W12

LG

R121

W16

W19 W20

W17

R122

R113

R401

W18

W24

W25

W26

W21

R109

R403

W23

R412

W22

234813 11 12

1576109

R406

R405

R407

R402

D411

D402 D403

C402

D401

C254

C215

W40

W30

W27

W35

W41

W42

C214

15 28

R203

W31

C208

W34

W36

R102

C102

C101

R108

W38

W33

W201

R404

W503

C209

R202

W48

4.5MHz

TH1

R251

W44

C216

C217

C207

W51

X1

W202

IC2

C211

C111

W56

C206

W54

1

80

C103

W506

R254

C251

W504

C210

R201

R112

R186

W49

W50

R111

W37

C204

R133

R107

1

R252

C252

C205

R149

W508

W57

C226 C227

L201

W58

C253

C202

C203

IC4

W59

W60

W61

W62

W64

R256

R255

R415

C404

W66

C41 R12

R131

C201

W65

W63

W505

24

25

224

R253

C213

C212

114

W32

IC1

65

64

W55

R147

R151

R152

R148

R185

W29

W502

R261

Q251

EB

W68

C258

R258

71

W73

W74 W75

W76

D201

W71

W84

W79

R181

R183

R184

40

41

R161

R533

R534

W39

C532

W510

W69

W509

W43

W70

W77

C256

R260

IC10

W85

Q50

R51

W80

EB

25

R136

W82

R162

Q191

Q52

Q51

W83

C110

148

Q11

R132

R137

R196

R262

D252

EB

W81

R50

W89

W45

R257

Q10

EB

C14

R16

W86

W78

EB

W90

R159

R55

D101

C255

D251

R10

R13

R11

EB

W92

R160

R141

R54

W93

L101

C257

D253

R134

D11

W96 W97 W98

R23

D20

R259

W95

C507

W87

W94

D10

C20

W100

W99

D5

C63

R15

R57

W103

R503

W102

9 8

R21

R14

C505

W104

R2

R22

W105

C508

W106

D3

C64

R56

R1

R53

C53

C55

W107

W109

R504

C502

R143

W110

R52

R20

C51

W111

C520

C518

C506

R144

Q501

C1

C501 R522

R520

R537

W112

W113

R502

W108

W117

C504

R145

R142

C50

W511

21 20

W114

W507

W115

R501

R524

J2

16 1

L1

W118

D1

D2

D4

W119

1

2

C52

C54

C516

IC5

R146

C535

C536

12

13

R518

C509

R516

31

40

C513

1

10

R523

C519

R515

R505

R521

R519

C517

C503

C534

C533

106

IC6

5

1

C56

30

11

BE

W122

W120 W121

R513

C515

R517

C514

W123

W124

C57

R150

R514

R532

R535

W125

W512

R511

R512

IC7

C511

10

C512

CN1

1

VR2VR1

SWITCH UNIT

X16-1520-XX (J74-1301-02)

SRC

D13

KS5

43

1 40

D20

D12

KI1

FMAM

KI2

ATT 1 2 3 4 5 6 RST CLK

D15

D3

KS4

D6

D5

D4

ED1

D7

D8

KS3

D9

D22

KI4

D10

AUTO

KI3

KS1

D14

KS2

AUD

SWITCH UNIT (X16-1520-XX)

VOL

D2

12

IC2

.ON.feR

CIQ

2H2

D21

D1

D11

sserddA

7

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

8