Kenwood RXD-107, RXD-608 Schematic

MINI HiFi COMPONENT SYSTEM

RXD-251/301/301E/301W/

RXD-351/351E/351W/371S/A3

SERVICE MANUAL

(XD-251~A3)**

In compliance with Federal Regulations, following are reproductions of labels on, or inside the product relating to laser product safety.

**Refer to page 2 if you want to know system configuration.

KENWOOD-Crop. certifies this equipment conforms to DHHS Regulations No. 21 DFR 1040. 10, Chapter 1, Subchapter J.

DANGER : Laser radiation when open and interlock defeated. AVOID DIRECT EXPOSURE TO BEAM

Panel(CD) * (A60-)

Front glass * (A29-)

Knob * (K29-)

Knob (K29-7512-08)

Knob (K29-7519-08)

Knob (K29-7518-08)

Phone jack (E11-0386-08)

Konb (K-29-7516-08)

Cassette lid(R) * (A53-)

Front glass(R) (B10-3451-08)

Front panel * (A60-)

Knob * (k29-)

Knob (K29-7523-08)

Knob (K29-7522-08)

Knob (K29-7521-08)

Cassette lid(L) * (A53-)

Front glass(L) (B10-3450-08)

Knob (K29-7515-08)

Knob (K29-7511-08)

Mic jack (E11-0387-08)

Knob * (K29-)

Knob (K29-7513-08)

Illust. is RXD-351.

* Refer to parts list on page 38.

FM indoor antenna (1)

Europe and U.K. Other countries

AM (T90-0815-08)

loop antenna (1)

AC (E03-0115-05)

plug adaptor (1)

Remote (A70-1260-08)

control unit (1)

Batteries (R6/AA) (2)

Use to adapt the plug on the power cord to the shape of the wall outlet. (Accessory only for regions where use is necessary.)

(T90-0801-05) : K1P1Y1M1M2M3X1X2X3

(T90-0836-05) : E1E2E3E4T1T2Q1Q2

Operation to reset

The microcomputer may fall into malfunction (impossibility to operate, erroneous display, etc.) when the power cord is unplugged while power is ON or due to an external factor. In this case, execute the following procedure to reset the microcomputer and return it to normal condition.

Press the "POWER" key while holding the Stop (7) key of the CD section pressed, to switch off the power, and then switch the power on again after a few seconds.

÷ Please note that resetting the microcomputer clears the contents

stored in and returns and to condition when it left the factory.

SYSTEM MAIN UNIT DESTINATION SPEAKER

XD-301 RXD-301 E3T2X3 LS-N301 XD-301E RXD-301E E4 LS-N301

XD-301W RXD-301W Q2 LS-N301 XD-351 RXD-351 E1T1 LS-N351 XD-351 RXD-351 M1X1Y1 LS-N371 XD-351E RXD-351E E2 LS-N351 XD-351W RXD-351W Q1 LS-N351 XD-A3 RXD-A3 K1P1 LS-N351 XD-371S RXD-371S M2 LS-N371 XD-251 RXD-251 M3X2 LS-N351

RXD-251/301/351/371S/A3

CONTENTS / ACCESSORIES

CONTENTS / ACCESSORIES ....................................2

EXTERNAL VIEW........................................................3

CONTROLS.................................................................4

BLOCK DIAGRAM.......................................................6

CIRCUIT DESCRIPTION.............................................7

CD MECHANISM OPERATION DESCRIPTION .........9

ADJUSTMENT.......................................................... 11

WIRING DIAGRAM....................................................15

PARTS DESCRIPTIONS...........................................16

PC BOARD ................................................................17

SCHEMATIC DIAGRAM............................................23

EXPLODED VIEW .....................................................37

PARTS LIST...............................................................38

SPECIFICATIONS.....................................................47

Contents

Accessories

System configuration Cautions

RXD-251/301/351/371S/A3

EXTERNAL VIEW

Slide switch (S62-0083-08)

AC power cord * (E30-)

Cabinet * (A01-)

Phono jack (E63-1073-08)

Slide switch (S62-0057-08)

Lock terminal board (E70-0108-08)

Antenna terminal * (E70-)

Illust. is RXD-351.

* Refer to parts list on page 38.

RXD-251/301/351/371S/A3

CONTROLS

unit

DISC 1 DISC 2 DISC 3

DISC SKIP

12 3 456

Receiver unit

ON/STANDBY

INPUT

STANDBY

MIC 1

MIC 2

MIC VOLUME

MIN.

MAX.

TIMER SET

CLOCK

DISPLAY

/DEMO

ROCK

FLAT

EX.BASS

POP

JAZZ

BAND

TUNING

PHONES

DOWN

AUTO

PRESET

MANUAL PRESET

AUTO/MONOTIMER

8 9

#$ %

(

)

™

¢∞

Skip (4, ¢) keys

DISC SKIP key

Used to skip discs.

Disc selection keys

The disc number is selected directly and playback starts.

OPEN/CLOSE (0) key

The disc tray is opened and closed.

Stop (7) key

Play/pause (6) key

Disc tray

Three discs can be stored.

ON/STANDBY ( ) key

INPUT key

Key for input switching.

TIMER key

Key for timer START/STOP switching.

MIC 1/MIC 2 jack (except for some areas)

MIC VOLUME knob (except for some areas)

TIMER SET key

Used for setting the timer ON/OFF time.

CLOCK key

Used to set the present time.

DISPLAY/DEMO key

Switches the display contents.

*Used for demonstration (DEMO) ON/OFF.

AUTO/MONO key

Switches the tuning mode.

MANUAL PRESET key

Used to memorize broadcasting stations in the desired order.

BAND key

Press to switch the receiving band.

(

TUNING/ keys

Used for tuning to broadcasting stations and for time settings.

)

PHONES terminal

For connection of a headphone (optional).

AUTO PRESET key

Used for automatic presetting of broadcasting stations.

™

VOLUME CONTROL knob

This is used for volume adjustment.

Sound selection keys

Used to select the desired sound type.

FLAT : For listening without changing the sound. JAZZ : A sound quality curve suitable for jazz. POP : A sound quality curve suitable for popular

music. ROCK : A sound quality curve suitable for rock-and-roll. EX.BASS: For listening with abundant bass. (Can be used

together with other sound selection keys.)

Display

∞

STANDBY indicator (Except for some areas)

RXD-251/301/351/371S/A3

CONTROLS

RXD-251/301/351/371S/A3

BLOCK DIAGRAM

CEDICL

VREF

3,28

2,29

1,30

TUNER

AUX

CONTROL

SERIES

DATA

A/B

PLAY

AMP

ALC

PLAY

R/P

OSC

BIAS

(Q209,L201)

Q205

Q203 Q204

Q206

Q201Q202

TAPE OUT

TAPE

Q405,406

REC BUFFER

IC402

TAPE OUT

REC OUT

REC IN

DECK A/B SW

Q213

IC301

MIC AMP

MIC IN

Q403,404

+3dB AMPPRE SET

EQ.

PRE AMP

IC404

EX-BASS

412

Q411,

410

Q409,

RL501

Q413,

414

MUTE

SYSTEM

714

-10dB ATTENUATOR

Q713,

POWER AMP

IC501

+VCC

-VCC

Q504-506

DETECTOR

IC502

SPEAKER

PROTECTOR

+12V

512

Q511,

MUTE

JACK

SPEAKER

Lch

HEADPHONES

JK502

Rch

JK501

+5.5V

Q702

+7.5V +12V

Q701

Q704

+VCC

SWITCHED

X'FORMER

-12V

Q709

+12V

-VCC

CN701

D702-705

D701

Q705,

706

Q703

LCD DISPLAY

IC601

u-COM

KEY

MATRIX

CN09

to CD PCB

CN401

to MAIN PCB

AMP

FILTER

TUNE

AMP

MIX

IFT CF1

BUFFOSC

TUNE

AMP

CF2

TUNE

AM RF

AMP

Q106

FM SECTION

Q101

PLL

IFT

u-COM

IC201

L.P.F

Q107,108

7.2MHz

AM SECTION

V.T.

AM ANT

GND

FM ANT

OUT

MIX

BUFF

AMP

TUNE

AM ANT

GND

FM ANT

AMP

AM RF

TUNE

OSC

ANT

IFT

PLL

L.P.F

Q107,108

AMP

IC201

u-COM

AMP

Q106

IFT CF1

FILTER

AM SECTION

FM SECTION

CF2

OUT

IC102

TUNE

FM RF

OSC

Q102

GND

IC01 CXA1782BQ

RF SIGNAL PROCESSING/SERVO AMP

PROCESSOR W/DAC

DIGITAL SIGNAL

CD POWER DRIVER

IC03 BA5936S

I/O PORT EXTENSION

IC02 74HC4094

IC04 CXD2508Q

XTL01

33.86MHz

IC15 NJM4558L

OP AMP

MOTOR

DISC

MOTOR

FEED

TRACKING

FOCUS

TRAY MOTOR

T/T MOTOR

LIMIT IN

OUTPUT

AUDIO

CONTROL SW

S01-04

Rch

Lch

u-COM

SUB WOOFER

IC602

-VCC

+VCC

PRE AMP

JK601

USED RXD-301(X3)/

RXD-351(M1,X1)/

RXD-371S(M2)

IC201

FM FRONT-END

FM RF IC101

TUNER UNIT

CD MECHA. UNIT

TUNER UNIT

AUDIO UNIT/DISPLAY UNIT

RXD-351

IC401

RXD-A3(K1,P1) TYPE ONLY

No. Name I/O Description

Active

1 CE I LC7218, LC75392 CE out 2 ENABLE – No used 3 DI I LC7218, LC75392, 74HC4094 data out 4 DO O Data output to LC7218 5 CLK I LC 7218, LC75392, 74HC4094 clock out 6 DATA O Serial data out to CXD2508Q 7 SQCO I Serial output of SUBQ 80BIT 8 SQCK O Clock output

9 XLAT O Latch output 10 FOK O Focus OK output 11 GND – GND 12 RESET I Reset signal input 13 POWER - DOWN I Power down input 14 SENS I CXD2508Q sens 15 VSS – Vss 16 X1 – Xtal 6.0MHz 17 X2 – Xtal 6.0MHz 18 VDD1 – Vdd

19~22 K1~K4 I Key input (K1~K4)

23, 24 GND – GND

25 MODE - SW2 I Model discrimination (RXD-371S only) 26 MODE - SW1 I Model discrimination 27 SCOR I CXD2508Q Sub - code synch detect 28 COUNT O Track number count signal output 29 REMOTE IN I Remote signal input 30 VR + I VR encoder input A 31 VR - I VR encoder input B 32 PIC - UP I Pick - up SW 33 PIC - DOWN I Pick - down SW 34 DISC - COUNT I Disc counter SW 35 TURNTABLE - SW I Turntable SW 36 TRAY - OPEN I Tray open SW 37 TRAY - CLOSE I Tray close SW 38 N/C – No used 39 VR - 1 O VR step extend out 0, 1 step others

40~51 N/C – No used 52~55 S1 - S4 O Segment out (1~4)

56 VDD2 – Vdd 57 VSS2 – Vss

58~79 S5~S26 O Segment out (5~26) 80~82 BIAS 3~1 – GND 83~86 COM - 0~3 O FL Common 0~3

87 FM - STEREO I FM stereo signal input Mono Stereo 88 SYN REC I Synchro start input 89 VSS3 – Vss

RXD-251/301/351/371S/A3

CIRCUIT DESCRIPTION

1. Microprocessor : (IC601, LC867224A-5H71)

1-1 Pin description

PORT SW 1 SW 2 SW 3 SW 4 SW 5 SW 6 SW 7 SW 8 SW 9 SW 10

Pin 19 Power Input Clock Timer Timer Display EQ Off Rock Jazz Pop

(K1) Set Mode Set

Pin 20 Tuning Tuning Band Auto/ Auto Manual EX Bass – – –

(K2) Up Down Mono Preset Preset

Pin 21 CD AMS - – – Disc Disc 1 Disc 2 Disc 3 Open –

(K3) AMS + Skip Close

Pin 22 CD CD Play FF – – – – – – –

(K4) Stop Pause

RXD-251/301/351/371S/A3

CIRCUIT DESCRIPTION

No. Name I/O Description

Active

90 VDD3 – Vdd 91 POWER - SW O Power SW out On Off 92 SYS - MUT O System mute out Off On 93 TU - MUT O Tuner mute out On Off 94 MODE - SW - IN I No used 95 FUNCTION - TAPE O Function tape out Tape Others 96 LCD - BACK - LIGHT O LCD back light control On Off 97 N/C – No used 98 EX - BASS O EX - bass control On Off 99 LATCH – No used

100 STB O 74HC4094 strobe

PIN NAME I/O DESCRIPTION ACTIVE

4 MUTE O CXD2508Q Muting (DAC) H : ON L : OFF 5 CONTROL O CXA1782BQ, CXD2508Q Vdd control H : Others L : CD 6 XRST O CXD2508Q XRST

7 T • T + O T • T/U • D Motor (+) 11 CONTROL O T • T Motor speed Control 12 TRAY - O Tray Motor Control (-) 13 TRAY + O Tray Motor Control (+) 14 T • T - O T • T/U • D Motor (-)

4. All LCD light on mode

• The all LCD light up when the STOP key and TIMER SET key are pressed simultaneously, while the power is ON.

• When the ON/STANDBY key is pressed, the all LCD light on mode is canceled.

2. Key matrix

3. I/O port extension (CD mecha. unit)

IC02 (74HC4094)

RXD-251/301/351/371S/A3

CD MECHANISM OPERATION DESCRIPTION

ROTARY MOTOR

GEAR PULLEY

RELAY GEAR A

RELAY GEAR B

TR LOCK GEAR

UD-CAM

UD REDUCE GEAR

CHANGE GEAR

TURN TABLE

DISC 2

DISC 1

DISC 3

DISC SW

Fig.1

SW C

TRAY MOTOR

Fig.3

Fig.2

TR GEAR

SENSOR SW

(STOP POSITION OF DISC 3)

1. In case of disc 3 (Refer to figure 1 and 2)

1 The rotary motor turns counterclockwise by pressing disc 3 key, therefore the turntable turns clockwise and disc 3 is detect-

ed by disc number detector switch.

2 The turntable stops the position of 3 marked as figure 2 and stop position of disc 3 is detected by sensor switch.

At this time, the position of TR lock gear is as shown figure 1.

3 The rotary motor turns clockwise and the relay gear B also turns clockwise.

By turning the relay gear B, the arm of relay gear B moves to arrow direction (2 7 7 7) and the TR lock gear will be locked. After that, the change gear separates from TR lock gear.

4 The UD reduce gear turns clockwise by turning the change gear. 5 The traverse moves up-side. 6 After finished the traverse operation, the disc motor turns and the disc 3 will be played.

2. Open/Close operation of tray while playing the disc.

(Refer to figure 3)

1 The tray motor turns clockwise by pressing

open/close key while playing the disc.

2 The change base moves to frontward by

turning the TR gear.

3 Pushing switch C by change base, the tray

motor stops.

RXD-251/301/351/371S/A3

CD MECHANISM OPERATION DESCRIPTION

How to replace the pick up. (Refer to figure 4~7)

1. Remove the screws (1 x 4), top chassis and spring (2 x 2).

2. Detach the traverse unit by removing shield (bottom side) and screws (3 x 2).

3. Short the short land and remove screws (4 x 4, 5 x 1).

4. Remove the rod and replace the pick up.

Fig.4

Fig.5

BOTTOM VIEW

Fig.7

Fig.6

SHORT LAND

TOP VIEW

RXD-251/301/351/371S/A3

NO.

ITEM

INPUT

SETTING

OUTPUT

SETTING

TUNER

SETTING

ALIGNMENT

POINTS

ALIGN FOR

FIG.

(A)

98 MHz,1 kHz MOD

±75 KHz (DEV)

60 dBu (ANT INPUT)

(B)

98MHz

T101

Maximum output

(Minimum distortion

LOW END TRACKING

(A)

87MHz, 1 kHz MOD

±75 kHz (DEV)

35 dBu ( ANT INPUT)

(B)

87MHz

L102

Maximum output

HI END

TRACKING

(A)

108MHz,1 kHz MOD

±75 kHz (DEV)

35 dBu (ANT INPUT)

(B)

108MHz

TC101

Maximum output

–

Connect the DC

voltage meter to

TP2.

87.5 MHz

L103

VT=1.0V±0.05V

108 MHz

–

Check the

VT=7.0V±1.0V

NO.

ITEM

INPUT

SETTING

OUTPUT

SETTING

TUNER

SETTING

ALIGNMENT

POINTS

ALIGN FOR

FIG.

(A)

531 kHz or 530 kHz

1 kHz, 30% MOD

60 dBu (ANT INPUT)

(B)

531 kHz

530 kHz

T102

Maximum output

(Minimum distortion)

LOW END TRACKING

(A)

531 kHz or 530 kHz

1 kHz, 30% MOD

30 dBu (ANT INPUT)

(B)

531 kHz

530 kHz

L104

Maximum output

HIGH END TRACKING

(A)

1602 kHz or 1610 kHz

1 kHz, 30% MOD

30 dBu (ANT INPUT)

(B)

1602 kHz

1610 kHz

TC102

Maximum output

–

Connect the DC

voltage meter to

TP2.

531 kHz

L105

VT=1.2V±0.05V

1602 kHz

–

Check the

VT=7.3V±1.0V

NO.

ITEM

INPUT

SETTING

OUTPUT

SETTING

TUNER

SETTING

ALIGNMENT

POINTS

ALIGN FOR

FIG.

5.95 MHz

1 kHz, 30% MOD

60 dBu (ANT INPUT)

(D)

(B)

5.95 MHz

T102

Maximum output

(Minimum distortion)

LOW END TRACKING

5.95 MHz

1 kHz, 30% MOD

30 dBu (ANT INPUT)

(D)

(B)

5.95 MHz

L201

Maximum output

HIGH END TRACKING

17.9 MHz

1 kHz, 30% MOD

30 dBu (ANT INPUT)

(D)

(B)

17.9 MHz

TC201

Maximum output

–

Connect the DC

voltage meter to

TP2.

5.95 MHz

L202

VT=1.0V±0.05V

17.9 MHz

–

Check the

VT=8.4V±1V

RXD-251/301/351/371S/A3

ADJUSTMENT

FM SECTION (Except for Europe version)

* Europe version no Adjustment

MW SECTION

SW SECTION

RXD-251/301/351/371S/A3

FM 75 Ω

ANTENNA

Europe and U.K.

Other countries

FM 75 Ω

GND

(A)

(C)

(D)

AM-SG

FM-MPX-SG

POLAR SG

Dummy antenna

Oscilloscope

AC voltmeter

(B)

Distortion meter

TO TUNER UNIT CN101, pin 9 (Lch)

pin 7 (Rch) pin 8 (GND)

NO.

ITEM

INPUT

SETTING

OUTPUT

SETTING

TUNER

SETTING

ALIGNMENT

POINTS

ALIGN FOR

FIG.

153 kHz

1 kHz, 30% MOD

60 dBu (ANT INPUT)

(D)

(B)

153 kHz

T102

Maximum output

(Minimum distortion)

LOW END

TRACKING

153 kHz

1 kHz, 30% MOD

30 dBu (ANT INPUT)

(D)

(B)

153 kHz

L201

Maximum output

HIGH END TRACKING

279 kHz

1 kHz, 30% MOD

30 dBu (ANT INPUT)

(D)

(B)

279 kHz

TC201

Maximum output

–

Connect the DC

voltage meter to

TP2.

153 kHz

L202

VT=1.0V±0.05V

279 kHz

–

Check the

VT=5.0V±1.0V

ADJUSTMENT

LW SECTION

INSTRUMENTS CONNECTION

+ 25 hidden pages