Service Manual for KENWOOD KRC-36Y

B51-7853-00 (S) 1929

SERVICE MANUAL

CASSETTE RECEIVER

KRC-391/391Y

KRC-36/36Y/30Y

LOUD

SCRL

SCAN

REP

T.CALL

M.RDM

B.S/RDM

MENU TI

VOL ADJ

CLK

KRC-391

SRC

OFF

45Wx4

AUD

DISC

Front glass

(B10-4127-01)

Knob(1-6)

(K25-1392-03)

Knob(SRC)

(K24-3820-04)

Knob(FM,AM)

(K25-1393-03)

Knob(VOL)

(K25-1395-03)

Cassette lid

(A53-1687-03)

Panel assy

(A64-2538-02)

q KRC-391

Knob(AUD)

(K24-3821-04)

Mounting hardware assy

(J21-9641-13)

Antenna adaptor

(T90-0523-05)

Lever

(D10-4589-04)

DC cord

(E30-4792-05)

Plastic cabinet assy

(A02-1486-13)

MECHANISM EXTENSION CORD

W05-0477-00 (7P)

W05-0609-00 (10P)

Refer to the PARTS LIST

KRC-391/Y,36/Y,30Y

2

BLOCK

DIAGRAM

FM ANT

AM ANT

RF GND

FM+B

AM+B

AM LO/DX

FM LO/DX

IF SELECT

RDS OUT

FM SD OUT

REQUEST

K2I-VTH

VCO-GND

FSD OUT

FM DET OUT

AM DET OUT

IF GND

COMMON+B

P-ON 5V

DIG GND

PLL DATA

PLL CLK

PLL CE

HI UP ADJ

FM+B

AM+B

A8V

SW5V

LO/DX

SD

S-METER

PLL-DATA

PLL-CE

SW5V

ACC-DET

BU-DET

SCL

MUTE

SDA

EN1

EN2

EN3

P

ANEL

RESET

DSI

CH

MUTE

NOISE

D

ATA

H

D

ATA

C

REQ

H

REQ

C

CH

RST

CH

CON

CH

CLK

Rch

COM

Lch

TAPE L/R

MP IN

AFS

QUAL

AM

MPX

OUT RR

OUT LR

OUT RF

LEVEL

SCL

SW5V

SDA

SCL

SD

A

OUT LF

STBY

MUTE

SMUTE

5

10

BU5V

AFS

R QUAL

R CLK

R DATA

BU5V

REMO

SW5V

GREEN

RED

BU5V

PHONE

BEEP

SVR

P-MUTE

P-STBY

SVR

AC GND(BEEP)

T

APE

L/R

PLL-CLK

SW5V

L-RES

L-CLK

L-D

A

T

A

S

L-D

A

T

A

L

MUSIC

EQ-MUTE

MS-CONT

MUSIC

EQ-MUTE

MS-CONT

FWD/REV

P

A

CK

IN

M-STBY

T

-MODE

T

-END

L-CE

340mV

SUB+

SUB-

Rch

Lch

PACK

T-END

M-STBY

T-MODE

FWD

REV

AUDIO

8V

MOTOR

BU14V

SW5V

IN

PLAY HEAD

SW5V

BU14V

BU5V

BU14V

EN1

EN2

EN3

P,CON

ILLUM

B.U.5V

AM+B

AUDIO

FM+B

AM+B

AUDIO 8V

BU5V

SW5V

TAPE

CD-CH

AM

FM

: 1719mV

: 3424mV

: 550mV

: 1727mV

TAPE

CD-CH

AM

FM

: 1786mV

: 3546mV

: 850mV

: 1345mV

AM : 160mV

FM : 213mV

CD L/R

1200mV

BU14V

CD L/R

8

RDS

ANT.

DECODER

SYSTEM u-COM

KEY

PAN 5V

MUTE

E2PROM

EQ AMP

CD ISO AMP

E-VOL

LCD DRIVER

LCD

DSI

REMO

RST SW

PAN IN SW

GREEN

RED or

RST IC

TEL DET

TEL MUTE

DRIVER

MAIN

SUB

AVR

SW5

B.U. DET

SURGE-DET

B.U.

ACC

P-CONT

DC CONNECTOR

REGULATOR

ACC DET

J2

VOLTAGE

MUTE

PRE

R-Lch

R-Rch

AMP

SVR

MUTE

THERMO

PROTECTION

FRONT Lch

FRONT Rch

REAR Lch

REAR Rch

IC4

J4

POWER IC

TDA7386

CD/MD

CHANGER

SP OUT

J5

PRE OUT

IC10

SUB MOTOR

DRIVER

MOTOR

DRIVER

IC1

IC2

IC12

IC9

IC2

IC1

IC11

IC7

IC8

Q2,3

IC6

TUNER

(X16)

(X14)

M

TAPE MECHA

KRC-391/Y,36/Y,30Y

3

COMPONENT DESCRIPTION

q SWITCH UNIT(X16-1532/1722-XX)

REF.No.

FUNCTION

OPERATION

IC1

LCD DRIVER

IC2

REMOTE SENSOR

Q1

KEY SCAN SW

Receives key signal when the base terminal voltage becomes "L".

Q2

KEY ILLUMINATION SW

Key illumination color becomes green when the base terminal voltage becomes "H".

Q3

KEY ILLUMINATION SW

Key illumination color becomes red when the base terminal voltage becomes "H".

q SYNTHESIZER UNIT(X14-6892/9002-XX)

REF.No.

FUNCTION

OPERATION

IC1

SYSTEM

µ-COM

IC2

E-VOLUME

IC4

POWER AMPLIFIER

Speaker output

IC6

RDS DECODER

IC7

POWER IC

IC8

MUTE CONTROL LOGIC

3 input NOR gate x 3

IC9

EQUALIZER AMPLIFIER

For full logical cassette mechanism control

IC10

SUB MOTOR DRIVER

For full logical cassette mechanism sub motor driver

IC11

RESET IC

Detection voltage below 3.0V

IC12

EEPROM

Q1

P.CON.DETECTION

Detects P.CON voltage.

Q10

BACK-UP DETECTION

Detects the back-up voltage.

Q11

SERGE DETECTION

Detects serge voltage.

Q20

ACC DETECTION

Detects ACC voltage.

Q40

PREOUT MUTE DRIVER

Mutes when the base terminal voltage level becomes "L".

Q50

5V SW

Works when the base terminal voltage level becomes "L".

Q101

DSI SW

LED for DSI works when the base terminal voltage level becomes "H".

Q151

PANEL 5V SW

Works when the base terminal voltage level becomes "L". Supplies VDD to panel.

Q201

NOISE DETECTION

Detects noise.

Q221-224 PREOUT MUTE

Mutes when the base terminal voltage level becomes "H".

Q251

POWER IC SVR SW

Discharges the capacitor's voltage of SVR terminal after the base terminal voltage

becomes "H".

Q301

LOCAL SEEK SW

Changes to the local seeking after the base terminal voltage becomes "H".

Q501

MOTOR DRIVER AVR

Works when the base terminal voltage becomes "H". Supplies the power to the motor

driver.

Q551

MAIN MOTOR SW

Works when the base terminal voltage becomes "L".

Q552

MAIN MOTOR SW

Works when the base terminal voltage becomes "H".

KRC-391/Y,36/Y,30Y

4

MICROCOMPUTER'S TERMINAL DESCRIPTION

q (X14-) IC1:

µ-COM

PORT No. PORT NAME I/O

FUNCTION

OPERATING CONDITION

1

DSI

O

DSI control.

2

PANEL

I

Panel detection.

"L": Panel exists.

3-

-

4

AVSS

-

GND.

5

L-RST

O

LCD driver reset.

6

L-CE

O

LCD driver chip enable.

7

AVREF1

I

Reference voltage

8-

-

9

PLL-DATA

I/O Front-end communication data.

10

PLL-CLK

O

Front-end communication clock.

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

R-DATA

I

RDS data.

15

R-QUAL

I

RDS QUAL.

16

CH-DATA C

I

Changer communication data.

17

CH-DATA H

O

Changer communication data.

18

CH-CLK

I/O Changer communication clock.

19

M-STBY

I

Cassette tape stand-by detection.

"H": Stand-by.

20

T-END

I

Tape end detection.

"H": Run. "L": Stop.

21

ACC-DET

I

ACC detection.

22

BU-DET

I

Back-up detection.

23

IC2 TYPE 0

I

For service.

"L": Normally.

24

IC2 TYPE 1

I

For service.

"L": Normally.

25

TYPE 0

I

Destination discrimination.

26

TYPE 1

I

Destination discrimination.

27

TYPE REF

O

Reference voltage for destination and service.

28

MOTOR

O

Cassette mechanism motor.

"H": ON.

"L": OFF.

29

PLL-CE

O

Front-end communication chip enable.

30

SD

I

Station detection.

"H": Station exists. "L": Station does not exist.

31

ASF

O

Noise detection time constant switch.

32

LO/DX

O

Local seeking switch.

"H": LO.

"L": DX.

33

VSS1

-

GND.

34

P-MUTE

O

Power amplifier muting.

35

SVR

O

SVR control.

36

-

37

IC2-SCL

O

E-volume communication clock.

38

IC2-SDA

I/O E-volume communication data.

39

MUTE

O

Muting control.

40

P-STBY

O

Power amplifier stand-by.

41

P.CON-DET

I

P.CON short-circuited detection.

42

CH-CONT

O

Changer control.

43

-

44

CH-REC H

O

Changer request.

45-47 -

-

48

EN2-1

O

Power supply IC control.

49

EN2-0

O

Power supply IC control.

50

BEEP

O

Buzzer.

51

EN3

O

Power supply IC control.

52

EN1

O

Power supply IC control.

53

SW 5V

O

P.ON 5V control.

"H": OFF.

"L": ON.

54

MUSIC

I

Tape signal detection.

"H": Signal does not exist. "L": Signal exist.

55

MS-CONT

O

Tape advanced sensitivity control.

"H": Play. "L": FF/REW.

56

EQ-MUTE

O

Cassette tape muting.

"H": ON.

"L": OFF.

KRC-391/Y,36/Y,30Y

5

KRC-391/Y,36/Y,30Y

6

MICROCOMPUTER'S TERMINAL DESCRIPTION

TEST MODE / ADJUSTMENT

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 should not released in conditions

of ACC OFF, power OFF, momentary power down or

the panel off.

3. Test mode

· Blanking Skip (B.S) OFF.

· Eject a tape by pressing "ATT" key.

4. Audio adjustment

· Enter the audio mode by pressing the "AUD" key or

"OPEN/CLOSE" key on the remote controller.

· Set the volume level to be -10dB. 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" keys.

5. Menu mode

· Enter the menu mode by pressing "CLK" key or "DNPP"

key on the remote controller.

· Only on models with RDS function, Local Seeking should

be first menu.

No.

ITEM

INPUT

OUTPUT

RECEIVER

ALIGNMENT

ALIGN FOR

FIG.

SETTINGS

POINTS

CASSETTE DECK SECTION

Head azimuth

Adjust so that output

1

AZIMUTH

TCC-153

SP OUT

TAPE PLAY

screw

level in playing "FWD"

(b)

10kHz

(FWD/REV)

and "REV" becomes

(ME1)

maximum each.

ADJUSTMENT

BALANCE/FADER/BASS/TREBLE : CENTER

T.ADV/METAL/DOLBY NR/AUTO : OFF

(b) AZIMUTH

PANEL FRONT

FWD

REV

TESTMODE

PORT No. PORT NAME I/O FUNCTION

OPERATING CONDITION

57

FWD/REV

I

Cassette tape running direction detection.

"H": FWD "L": REV.

58

SUB+

O

Sub motor control.

59

SUB-

O

Sub motor control.

60

RESET

I

System reset.

61

REMOTE

I

Remote control.

62

R-CLK

I

RDS clock.

63

CH-REQ C

I

Changer request.

64

PACK-IN

I

Cassette tape pack-in detection.

65

KEY-REQ

I

Key signal detection.

66

-

67

VSS0

-

GND.

68

VDD1

-

VDD.

69

X2

-

Main system clock.

70

X1

I

Main system clock.

71

IC

-

72

-

73

XT1

-

VDD.

74

VDD0

-

VDD.

75

AVREF 0

I

Reference voltage.

76

S-METER

I

SD detection.

"H": SD exists. "L": SD does not exist.

77

T-MODE

I

Cassette tape mode detection.

78

PHONE

I

Navi mute: Over 2.5V. Tel mute: less than 2.5V.

79

NOISE

I

Noise detection during FM mode.

80

AV CONT

O

Reference voltage.

KENWOOD KRC-36Y Service Manual

Manual details

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