Kenwood RXD-251 Manual de usuario

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 reproduc-

tions 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-)

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

(T90-0815-08)

loop antenna (1)

(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 oper-

ate, 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

CD unit

DISC 1 DISC 2 DISC 3

076

¢



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

#$ %

()

¡



™



£



¢



∞



Skip (

¢

) keys

DISC SKIP key

Used to skip discs.

Disc selection keys

The disc number is selected directly and playback starts.

OPEN/CLOSE (

) key

The disc tray is opened and closed.

Stop (

) key

Play/pause (

) 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

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

IF CF2

TUNE

AM RF

AMP

Q106

FM SECTION

Q101

PLL

IFT

AM 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 RF

IFT

PLL

L.P.F

Q107,108

AMP

RF IC201

u-COM

AMP

Q106

IFT CF1 IF 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

OPAMP

MMOTOR

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)

1The 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.

2The turntable stops the position of 3marked 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.

3The 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.

4The UD reduce gear turns clockwise by turning the change gear.

5The traverse moves up-side.

6After 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)

1The tray motor turns clockwise by pressing

open/close key while playing the disc.

2The change base moves to frontward by

turning the TR gear.

3Pushing 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 (1x 4), top chassis and spring (2x 2).

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

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

4. Remove the rod and replace the pick up.

1x2

3x1

2x2

2x1

Fig.4 Fig.5

BOTTOM VIEW

4x2 4x2

5x1

Fig.7

Fig.6

SHORT LAND

TOP VIEW

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