Kenwood KRC-309S, KRC-389, KRC-389W Service Manual

CASSETTE RECEIVER

KRC-309S/389/389W

SERVICE MANUAL

KRC-409/479 KRC-489/489G

KRC-309S (K)

KRC-309S

CD MD-Changer Control

45W x 4

CRSC

KRC-389

CD MD-Changer Control

45W x 4

CRSC

KRC-389/389W (M)

KRC-409 (K)

KRC-409

CD MD-Changer Control

45W x 4

CRSC

KRC-479 (M)

KRC-479

CD MD-Changer Control

45W x 4

CRSC

KRC-489/489G (M)

MECHANISM EXTENSION CORD

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

KRC-489

CD MD-Changer Control

45W x 4

CRSC

RC1

763x2

262

261

242

223

DC1

201

246

The following reference numbers with accessory parts are the same reference numbers used on EXPLODED VIEW and PARTS LIST.

40%

(X13)

(X14)

KRC-309S/389/389W (K/M/M)

KRC-409/479,489/489G (K/M,M/M)

RX-380 (J)

F/E

SW5V

B.U.14V

B.U.5V

B.U.14V

FM ANT

AM ANT

RF GND

FM+B

AM+B

OSC GND

PLL+B

PLL-DATA

IFC OUT

PLL-CLK

VDD 5V

IF2+B

IF2 GND

DIG GND

IF1 GND

S-METER

IF1+B

AUDIO OUT

PLL-DATA

S-METER

SUB+

SUB-

EN2

ACC-DET

EN1

SCL

MUTE

SDA

EN3

SW5

PC-DET

PA-DET

PANE L

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 INAMMPX

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

B.U.5V

Rch

Lch

PACK

T-END

M-STBY

T-MODE

FWD

REV

B.U.5V

AUDIO 8V

B.U.14V

CHRST

SMUTE

FM+B

AM+B

AUDIO

MAIN M

MOTOR

B.U.14V

SW5V

1040

PLAY HEAD

B.U.5V

PLL-CLK

T-MODE

T-END

B.U.5V

REMO

SW5V

BU-DET

P-STBY

SVR

P-MUTE

CHMUTE

STBY

CD L/RCD L/R

TAPE L/R

1200mV

400mV

170mV

340mV

TAPE :1719mV

CD-CH :3424mV

AM :550mV

FM :1727mV

TAPE :1780mV

CD-CH :3546mV

AM :570mV

FM :1789mV

AUDIO 8V

TAPE L/R

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

IC6

EQ AMP

CD ISO AMP

NC,MPX

IC2

E-VOL.

CD/MD

CHANGER

FRONT Lch

FRONT Rch

REAR Lch

REAR Rch

REGULATOR

LCD DRIVER

LCD

TAPE MECHA

MAIN

SUB

IC5

F-Lch

F-Rch

R-Lch

R-Rch

PRE OUT

SP OUT

SUB M

MOTOR

AVR

CDS-522

DSI

REMO

RST SW

PAN IN SW

ACC DET

VOLTAGE

DRIVER

AMP

SVR

PC-DET

PA-DET

MUTE

THERMO

PROTECTION

LC72366

KRC-309S/389/389W,409/479,489/489G

BLOCK DIAGRAM

COMPONENT DESCRIPTION

SYNTHESIZER UNIT (X14-639x-xx)

KRC-309S/389/389W,409/479,489/489G

REF

No.

IC1 SYSTEM µ-COM

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 (120uSec.). IC6 SUB MOTOR DRIVER Controls the sub motor. IC7 AVR B.U.:5V, AUD:8V, FM+B:8V, AM+B:8V

IC10 MUTE CONTROL LOGIC Controls logic.

Q10 BACK-UP DETECTION Output becomes "H" when the back-up voltage becomes less than 9V

Q11 SERGE DETECTION (Momentary power down). Output becomes "H" when the back-up

Q41 PRE MUTE DRIVER When input becomes "L", output becomes "H" (Preout mute).

Q50 5V SW

Q51

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

Q190 PANEL SW

Q191 DSI DRIVER

Q221-224 PRE MUTE

Q251 SVR "L" when input becomes "H".

Q501 SUB MOTOR AVR

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

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.

FUNCTION OPERATION

Controls FM/AM tuner, the changer, cassette mechanism, volume and tone.

Output becomes "L" when the back-up voltage becomes more than 9V.

(momentary power down). Output becomes "L" when the back-up voltage becomes more then 18V

voltage becomes less than 18V.

Outputs 5V to the SW5V power supply when input becomes "L". SW5V power supply line is cut off when the input becomes "H".

Outputs 5V to the panel VDD line when panel is attached. Panel VDD line is cut off when panel is taken out. DSI lights when input becomes "L". DSI turns off when input becomes "H".DSI turns on and off when panel is taken off. Works when input becomes "H". Being cancelled when input becomes "L".

Outputs 7.3V when AUD8V exists. Output does not exist when AUD8V does not exist.

SWITCH UNIT (X13-986x-xx)

REF.

No.

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.

FUNCTION OPERATION

KRC-309S/389/389W,409/479,489/489G

MICROCOMPUTER'S TERMINAL DESCRIPTION

(X14-) IC1 : µ-COM

PORT

No.

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 contol. 38 EN3-1 O Power supply IC contol. 39 EN3-0 O Power supply IC contol. 40 EN2-1 O Power supply IC contol.

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.

MICROCOMPUTER'S TERMINAL DESCRIPTION

(X14-) IC1 : µ-COM

KRC-309S/389/389W,409/479,489/489G

PORT

No.

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.

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.

PORT NAME I/O FUNCTION OPERATING CONDITION

KRC-309S/389/389W,409/479,489/489G

TEST MODE

1. How to enter the test mode

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

• Turn on the power while holding the “FM” key and preset “6” key in conditions of ACC ON and Panel ON.

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

2. How to release the test mode

• Simply reset the unit.

• Turn on the power after being in conditions of ACC OFF, power OFF, momentary power down and the panel off.

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/fullrear each by pressing the “UP” and “DOWN” keys in 3 steps range.

KRC-309S/389/389W,409/479,489/489G

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

No. ITEM

INPUT

SETTINGS

OUTPUT

SETTINGS

RECEIVER

SETTINGS

ALIGNMENT

POINTS

ALIGN FOR FIG.

CASSETTE DECK SECTION

1 AZIMUTH

TCC-153

10KHz

SP OUT TAPE PLAY

Head azimuth

screw

(FWD/REV)

(ME1)

Adjust so that output

level in playing "FWD"

and "REV" becomes

maximum each.

(b)

DOLBY

(PLAY BACK

LEVEL)

TCC-130

Connect an

AC voltmeter

to CN5

(X14-)

TAPE PLAY

VR1 (L ch)

VR2 (R ch)

(X14-)

300mv

(b) AZIMUTH

PANEL FRONT

FWD

REV

ADJUSTMENT

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