Kenwood KRC-30-Y, KRC-36, KRC-36-Y, KRC-391, KRC-391-Y Service manual

CASSETTE RECEIVER

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

SERVICE MANUAL

● KRC-391

© 2001-10 PRINTED IN JAPAN

B51-7853-00 (S) 1929

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
(A64-2538-02)

KRC-391

LOUD SCRL SCAN REP T.CALL M.RDMB.S/RDM MENU TI VOL ADJCLK

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

Cassette lid
(A53-1687-03)

45Wx4

∗ Front glass
(B10-4127-01)

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

DISC

AUD

Knob(AUD)
(K24-3821-04)

Mounting hardware assy
(J21-9641-13)

Lever
(D10-4589-04)

DC cord
(E30-4792-05)

Antenna adaptor
(T90-0523-05)

2

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

PANEL

RESET

DSI

CH MUTE

NOISE

DATA H

DATA 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

SDA

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)

TAPE L/R

PLL-CLK

SW5V

L-RES

L-CLK

L-DATA S

L-DATA L

MUSIC

EQ-MUTE

MS-CONT

MUSIC
EQ-MUTE
MS-CONT

FWD/REV

PACK 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+BFM+B

AM+B

AUDIO 8V

AUDIO 8V

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 SWPAN 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)

MM

TAPE MECHA

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

BLOCK DIAGRAM

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

COMPONENT DESCRIPTION

● 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

Q251 POWER IC SVR SW Discharges the capacitor's voltage of SVR terminal after the base terminal voltage

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

Q551 MAIN MOTOR SW Works when the base terminal voltage becomes "L".
Q552 MAIN MOTOR SW Works when the base terminal voltage becomes "H".

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

becomes "H".

driver.

● 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".

3