Sony HCD-GRX20,HCD-RXD3 Service Manual

HCD-GRX20/RXD3

AEP Model

UK Model

HCD-RXD3

E Model

Australian Model

HCD-GRX20

SERVICE MANUAL

MINI Hi-Fi COMPONENT SYSTEM

— Continued on next page —

SPECIFICATIONS

Model Name Using Similar Mechanism NEW
CD Mechanism Type CX3
Base Unit Type KSM-213ECM
Optical Pick-up Type KSS-213ECM/C2NP
Model Name Using Similar Mechanism NEW
Tape T ransport Mechanism T ype CWL-44-FR

CD

SECTION

TAPE

DECK

SECTION

HCD-GRX20/RXD3 are the tuner, deck, CD
and amplifier section in MHC-GRX20/RXD3.

Sony Corporation

Home Audio Company
Published by Sony Engineering Corporation

9-928-949-13

2003E16-1
© 2003.05

PHOTO : HCD-RXD3

Amplifier section

European model

DIN power output (Rated) 40 W + 40 W

(6 Ω at 1 kHz, DIN)

Continuous RMS power output (Reference)

50 W + 50 W
(6 Ω at 1 kHz, 10%
THD)

Music power output (Reference)

100 W + 100 W
(6 Ω at 1 kHz, 10%
THD)

Other models

The following measured at AC 110, 220 V 60 Hz;
DIN power output (Rated) 45 W + 45 W

(6 Ω at 1 kHz, DIN)

Continuous RMS power output (Reference)

50 W + 50 W
(6 Ω at 1 kHz, 10%

THD)
The following measured at AC 120, 240 V 60 Hz;
DIN power output (Rated) 50 W + 50 W

(6 Ω at 1 kHz, DIN)
Continuous RMS power output (Reference)

60 W + 60 W

(6 Ω at 1 kHz, 10%

THD)
Inputs

MD IN (phono jack): voltage 450 mV,

impedance 47 kΩ

Outputs

MD OUT (phono jacks):

voltage 250 mV
impedance 1 kΩ

PHONES (stereo phone jack):

accepts headphones of 8
Ω or more.

SPEAKER: accepts impedance of 6

to 16 Ω

CD player section

System Compact disc and digital

audio system

Laser Semiconductor laser

(λ = 780 nm)
Emission duration:
continuous

Laser output Max. 44.6µW*

*This output is the value
measured at a distance of
200 mm from the
objective lens surface on
the Optical Pick-up
Block with 7 mm

aperture.
Frequency response 20Hz – 20kHz (±0.5 dB)
Wavelength 780 – 790 nm

DIGITAL OUT (OPTICAL)
(Square optical connector jack, rear panel)
Wavelength 600 nm
Output Level –18 dBm

Tape deck section

Recording system 4-track 2-channel stereo
Frequency response 40 – 13,000 Hz (±3 dB),

using Sony TYPE I
cassette

Wow and flutter ±0.15% W. Peak(IEC)

0.1% W. RMS(NAB)
±0.2% W. Peak(DIN)

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tunr section

Tuning range 87.5 – 108.0 MHz
Antenna FM lead antenna
Antenna terminals 75 Ω unbalanced
Intermediate frequency 10.7 MHz

Ver 1.2 2003. 05

2

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH
MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY .

Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be
damaged by heat.

Flexible Circuit Board Repairing

• Keep the temperature of soldering iron around 270˚C
during repairing.

• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering
or unsoldering.

MODEL IDENTIFICATION
— CABINET, REAR —

• Abbreviation
AUS : Australian model
SP : Singapore model
MX : Mexican model
AR : Argentina model
TW : Taiwan model

PART NO.

RXD3 model 4-221-603-0π
GRX20 : AUS model 4-221-604-0π
GRX20 : AR, E, SP, TW models 4-221-605-0π
GRX20 : MX model 4-221-606-0π

PARTS No.MODEL

AM tuner section

Tuning renge 531 – 1,602 kHz

(with AM tuning interval set at 9 kHz)
530 – 1,710 kHz

(with AM tuning interval set at 10 kHz)
Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz

General

Power requirements

European model 230 V AC, 50/60 Hz
Mexican model 120 V AC, 50/60 Hz
Australian model 240 V AC, 50/60 Hz
Other models 110 – 120 V or 220 – 240 V AC, 50/60 Hz

(adjustable with voltage selector)
Power consumption

European model 105 W
Other models 115 W

Dimensions (w/h/d) incl. projecting parts and controls

Approx. 280 × 320 × 400 mm

(111/8 × 125/8 × 153/4 in)
Mass Approx. 9.2kg (20 lb 5 oz.)
Supplied accessories: AM loop antenna (1)

FM lead antenna (1)

Remote (1)

Plug adaptor (for Asian model) (1)
Design and specifications are subject to change without notice.

3

TABLE OF CONTENTS

1. GENERAL ·········································································· 4

2. DISASSEMBLY

2-1. CD Door ·············································································5
2-2. Front Panel ········································································· 6
2-3. Main Board········································································· 6
2-4. Amplifier Board ································································· 7
2-5. CD Tray ·············································································· 7
2-6. Decord Board ····································································· 8
2-7. Base Unit ············································································ 9
2-8. Cassette Lid ········································································ 9

3. TEST MODE ···································································· 10

4. MECHANICAL ADJUSTMENTS ····························· 11

5. ELECTRICAL ADJUSTMENTS ······························· 11

6. DIAGRAMS

6-1. Circuit Boards Location ··················································· 16
6-2. Block Diagrams ································································ 17

Main Section····································································· 17

Tuner, CD Section ···························································· 18
6-3. Printed Wiring Board Main Section ······························· 20
6-4. Schematic Diagram Main (1/3) Section ························· 21
6-5. Schematic Diagram Main (2/3) Section ························· 22
6-6. Schematic Diagram Main (3/3) Section ························· 23
6-7. Printed Wiring Board Front Panel Section ····················· 24
6-8. Schematic Diagram Front Panel Section ························ 25
6-9. Printed Wiring Board Amplifier Section ························ 26
6-10. Schematic Diagram Amplifier Section··························· 27
6-11. Printed Wiring Board CD Section ·································· 28
6-12. Schematic Diagram CD Section····································· 29
6-13. IC Pin Function ································································ 30
6-14. IC Block Diagrams··························································· 31

7. EXPLODED VIEWS

7-1. Cabinet Section································································· 35
7-2. Front Panel Section ·························································· 36
7-3. CD Mechanism Deck Section-1 ······································· 37
7-4. CD Mechanism Deck Section-2 ······································· 38
7-5. Base Unit Section (KSM-213ECM) ································· 39

8. ELECTRICAL PARTS LIST ······································· 40

4

1 1/u (Power) button
2 TIMER SELECT button
3 CLOCK/TIMER SET button
4 ( (TAPE A) button
5 9 (TAPE B) button
6 ( (TAPE B) button
7 p (STOP) button
8 ^ (CD) button
9 DISPLAY/DEMO button
!º FUNCTION button
!¡ TUNER/BAND button
!™ + button
!£ + + button
!¢ CD SYNC button
!∞ PAUSE button
!§ REC button

!¶ 6 OPEN/CLOSE button
!• DISC SKIP/EX-CHANGE button
!ª DISC 3 button
@º DISC 2 button
@¡ DISC 1 button
@™ DECK B
@£ ENTER/NEXT button
@¢ VOLUME knob
@∞ DECK A
@§ REPEAT/STEREO/MONO button
@¶ PLAY MODE/TUNER MEMORY button
@• EDIT/DIRECTION button
@ª DBFB button
#º FILE SELECT button
#¡ PHONES jack
#™ = – button
#£ = button

SECTION 1

GENERAL

4

3

2

#¡

@¶

@•

@§

@∞

@¢

@£

@™

@¡

@º

!ª

!§

!∞
!¶

!•

!¢

!£

!™

56 78 9

!º
!¡

1
#£

#™

#º
@ª

5

SECTION 2

DISASSEMBLY

Note : Follow the disassembly procedure in the numerical order given.

2-1. CD DOOR

8

CD door

5

Top cover

4

Remove the

claws

4

Remove the

claws

7

Remove the

claws

2

Three screws

1

Three srews

3

Five screws

6

Pull out the CD tray and remove the
CD door with releasing claws into the
directioin of arrow.

6

2-2. FRONT PANEL

2-3. MAIN BOARD

9

Board to board
connectors
(CN602)
(CN601)

MAIN board

3

Harness

(CN303)

1

Three screws

2

Screw

!º

Front panel

4

Flat type wir

e

(CN705)

5

Flat type wire

(CN501)

7

Connector

(CN201)

8

Remove the

claws

6

Connector

(to deckB)

6

Five screws

4

CD mechanism deck

2

T wo screws

3

Connector

(CN703)

5

Harness (CN701)

1

Harness (CN301)

7

MAIN board

7

2-4. AMPLIFIER BOARD

2-5. CD TRA Y

2

T wo screws

6

Rear cover

5

Remove the claws

4

T wo screws

1

Connector

(CN703)

8

Three screws

7

Three screws

9

Three screws

!º

AMPLIFIER board

3

Three screw

s

1

Screw

2

Bracket

4

Bracket

5

Flat type wir

e

(CN06)

3

Screw

6

CD tray

8

2-6. DECORD BOARD

4

Three screws

6

CD decode board

1

Flat cable

(CN706)

3

Flat cable (CN701

)

2

Connector

(CN707)

5

Connector

(CN702)

9

2-8. CASSETTE LID

2-7. BASE UNIT

2

Screw

3

UD-gear

4

Screw

5

UD-Cam

8

Spring

7

Spring

6

Spring

1

T wo screws

9

Base unit

Cassette door
(Note: Four claws are used.)

10

SECTION 3

TEST MODE

Function Key combination Description

Initialization

STOP + POWER OFF All preset data is re-set to the initial
(default) value.

Model display

STOP + DISC 1 Mode name is displayed.

Destination display

STOP + DISC 2 Destination is displayed.

Version display

STOP + DISC 3 Version number of the
microprocessor is displayed.

CD aging mode

STOP + DISC SKIP/EX-CHANGE Set discs to DISC 1 and DISC

3. The following operations are repeated when aging

starts:

1. DISC 1: TOC Read

2. Plays back the last music of the DISC 1.

3. DISC 3 : TOC Read

4. Plays back the last music of the DISC 3.

5. STOP

6. Tray is open and closed.

TAPE aging mode

STOP + PLAY A Insert a commercially available cassette tape (10
min) to the decks A and B. When aging starts, each tape is rewound
and the following

operations are repeated:

1. TAPE A: FWD PLAY for one minute

2. TAPE A: FWD STOP for one second

3. TAPE A: FWD PLAY for three minutes

4. TAPE A: FWD FF to tape end

5. TAPE B: FWD PLAY for one minute

6. TAPE B: FWD REC PAUSE for one second

7. TAPE B: FWD REC for three minutes

8. TAPE B: FWD FF to tape end

9. TAPE B: REV PLAY for one minute

10. TAPE B: REV REC PAUSE for one second

11. TAPE B: REV REC for three minutes

12. TAPE B: REV FF to tape end.

CD service mode

STOP + OPEN/CLOSE The message “CD S - -” is displayed on the
screen. The sled is moved to the outer circumference
while the FF button is pressed. Also, the SLED is moved to the
inner
circumference while the REW button is pressed. After pressing the
PLA Y
button, FOCUS is turned ON, CL V-S is set, TRACKING and SLED
servos
are turned OFF and ADDRESS 3 = 3F, 37 is set.

Display

STOP + DBFB All displays are turned ON.

Balance adjustment value

STOP + DISPLAY/DEMO The balance adjustment value is
displayed.

Key check

STOP + FILE SELECT Function of the pressed key is displayed.

11

Precaution

1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback head pinch rollers
erase head rubber belts
capstan idlers

2. Demagnetize the record/playback head with a head
demagnetizer.

3. Do not use a magnetized screwdriver for the adjustments.

4. After the adjustments, apply suitable locking compound to the
parts adjusted.

5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.

Torque Measurement

SECTION 4

MECHANICAL ADJUSTMENTS

Meter reading

40 to 70 g • cm

(0.56 - 0.97 oz • inch)

1 to 5 g • cm

(0.01 - 0.07 oz • inch)

55 to 140 g • cm

(0.76 - 1.94 oz • inch)

Torque

FWD
FWD

back tension

FF/REW

Torque meter

CQ-102C

CQ-102C

CQ-201B

SECTION 5

ELECTRICAL ADJUSTMENTS

1. Demagnetize the record/playback head with a head
demagnetizer.

2. Do not use a magnetized screwdriver for the adjustments.

3. After the adjustments, apply suitable locking compound to the
parts adjusted.

4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.

5. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)

6. The adjustments should be performed for both L-CH and R­CH.

Record/Playback Head Azimuth Adjustment
(Deck A, Deck B)

Note: Perform this adjustments for both decks.

Procedure:

1. Mode : Playback

2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 2 dB of peak.

DECK SECTION 0 dB=0.775V

Tape

P-4-A100

WS-48B

Signal

10 kHz, –10 dB

3 kHz, 0 dB

Used for

Azimuth Adjustment

Tape Speed Adjustment

test tape
P-4-A100
(10kHz, –10dB)

set

SPEAKER
terminal (JK401)

level meter

L-CH
peak

R-CH
peak

screw
position

output
level

within
2dB

L-CH
peak

R-CH
peak

screw
position

within 2dB

12

3. Mode: Playback

4. After the adjustments, apply suitable locking compound to the
parts adjusted.

Adjustment Location:

Remove the cassette lid before adjustment (See page 9)

Tape Speed Adjustment (Deck A)

Procedure:

1. Mode: Playback

2. Adjust the SFR501 so that the frequency counter reads 3,000
Hz ± 90Hz.

Adjustment Location: MAIN board

Sample Value of Wow and flutter

W. RMS (JIS) within 0.3%
(test tape: WS-48B)

[MAIN BOARD] — Component side —

test tape
P-4-A100
(10kHz, –10dB)

SPEAKER
terminal (JK401)
(L-CH)

SPEAKER
terminal (JK401)
(R-CH)

oscilloscop

e

L

R

Waveform of oscilloscope

in phase 45˚ 90˚ 135˚ 180˚

good wrong

Adjustment screws
REC/PB head (deck B)
or PB head (deck A)

test tape
WS-48B
(3kHz, 0dB)

set

SPEAKER
terminal (JK401)

frequency counte

r

+
–

Tape Speed

CN501

CN601

SFR501

13

TUNER SECTION 0 dB=1µV

AM T uning Voltage Adjustment

Procedure:

1. Set the reception frequency of the unit to 530 kHz.

2. Adjust L105 for 1.2 ± 0.05 V reading on the DC voltmeter.

3. Set the reception frequency of the unit to 1,710 kHz.

4. Confirm that the voltage reading on the DC voltmeter is within

8.0 ± 0.5 V.

Adjustment Location: MAIN board (See page 14)

AM Trac king Adjustment

Procedure:

1. Tune the set to 600 kHz.

2. Set the output of AM RF SSG so that the input lev el of the set
will become 60 dB (µV/m).

3. Adjust L104 so that when the waveform on the oscilloscope is
maximum, no noise appears.

4. Tune the set to 1,400 kHz.

5. Adjust TC102 so that when the waveform on the oscilloscope
is maximum, no noise appears.

• Repeat the procedures in each adjustment several times, and the

tracking adjustment should be finally done by the trimmer
capacitors.

Adjustment Location: MAIN board (See page 14)

Main board

TP1

G
VT

DC voltmete

r

+
–

AM RF SSG

loop antenna

set

loop antenna
(Supplied accessories)

60 cm

AM ANTENNA
terminal (TM1)

30% amplitude
modulation by
400 Hz signal

Field strength dB (

µ

V/m) =SSG output level dB (µV/m) –26 dB.

14

FM Tuned Level Adjustment

Procedure:

1. Supply a 28 dB 98 MHz signal from the ANTENN A terminal.

2. Tune the set to 98 MHz.

3. Adjust SFR101 to the point (moment) when the TUNED
indicator will change from going off to going on.

Adjustment Location: MAIN board

Adjustment Location

[MAIN BOARD] — Component side —

FM RF SSG

75

Ω

coaxial

Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 28 dB (at 75 W open)

FM ANTENNA terminal
(JK101)

set

L104

TC102

TP1

SFR101

L105

FM T uned Level

AM T uning
Voltage

AM T rac king

JK101

15

CD SECTION

Note:

1. CD Block is basically constructed to operate without
adjustment. Therefore, check each item in order given.

2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

3. Use an oscilloscope with more than 10MΩ impedance.

4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.

5. Adjust the focus bias adjustment when optical block is replaced.

RF Level Check

Procedure :

1. Connect oscilloscope to test point TP (RF) on CD DECODER
board.

2. Turned Power switch on.

3. Put disc (YEDS-18) in and playback.

4. Confirm that oscilloscope waveform is clear and check RF
signal level is correct or not.

Note: Clear RF signal waveform means that the shape “◊” can be

clearly distinguished at the center of the waveform.

Adjustment Location:

[CD DECODER BOARD] — Component side —

CD DECODER
board

oscilloscope

TP (RF)
TP (VC)

VOLT/DIV: 200 m

V

TIME/DIV: 500 nS

level: 1.0 Vp-p

+0.3
–0.2

IC702

IC701

J778

J789

TP (VC)

TP

(RF)

CN701

16

SECTION 6

DIAGRAMS

6-1. CIRCUIT BOARDS LOCATION

MAIN board

CD DECORD board

TR board

AC SWITCH board

FRONT board

SW (A) board

PHOTO SOCKET board

SW (B) board

SW (C) board

SW (D) board

MOTOR board

H/P board

VR board

SENSOR board

MOTOR (6P) (S) board

FUSE board

AMPLIFIER board

HCD-GRX20/RXD3

1717

HP901

PB

HEAD

TAPE B

HRP901
REC/PB

HEAD

TAPE A

R CHR CH

R CH

PLAY/REC

CONTROL

Q203, 205

PLAY/REC
CONTROL

DRIVE

Q207

PLAY/REC
CONTROL

D201

L291

BIAS OSC

BIAS
OSC

Q251

HE901

ERASE

HEAD

R CH

1

2

9

3

REC OUT

PB OUT

A/B

5

19

11
10

REC/PB

EQ AMP

IC201

TAPE A/B

Q213
MUTE

Q320

AMS

Q551,552

D202

: FM

: CD

• Signal Path

• RCH is omitted

C

CD

SECTION

TU L

ST IND

TU MUTE

DO1

Q401

MUTE

14 7

4

POWER AMP

IC401

SPEAKER

RELAY
DRIVE

Q403

Q405

1

2

6

IC402

RL401

SPEAKER

JK401

SCOR

SENS1

SQSO

XLAT

SQCK

CLK

DI

CLK

CE

STB

11

STB

21CE25

SCLK

27

SDATA OUT

24

DATA22SQCK

20

XLAT

23

SQSO

42

SENS1

4

SCOR

26

SDATA IN

MUTE

DRIVE

Q411

MUTE

SWITCH

Q603,604

62

TU MUTE

28

FM ST IND

17

CTRL

63

SYSTEM MUTE

64

POWER SW

LED DRIVE

IC602

2
3
4

19

ALATCH

11

LED

DRIVE

DI

CLK

Q607,608

LED602-607

LED601

XTAL40XTAL

39

VR UP

52

X601

10MHz

VR DOWN

53

VR601

VOLUME

PIC UP

46

PIC DOWN

47

TRAY OPEN

50

TRAY CLOSE

51

TURN TABLE

49

DISC COUNT

48

A

B

S02

TRAY

OPEN/CLOSE

DET

S03
DISC

COUNTER

DET

S04
TURNTABLE
OPERATION

DET

S01

CD DECK

UP/DOWN

DET

KEY

MATRIX

S601-629

P2 P24

KI0 KI2

FLD601

FLD DISPLAY

SYSTEM CONTROLLER/

FLD DRIVER

IC601

+5.6V
REG

Q308

SITCHING

Q705

+5V

+12V

+7.5V
REG

Q702

CD +7.5V

+12V
REG

Q701

RECT

D705-708

P MUTE

CONT

Q703

AC OFF

DET

Q704

D713

D704

RECT

D701

-12V

IC401 B-

IC401 B+

-27V
REG

Q705

-27V

T001

AC4.8V
AC4.8V

16

A

TUNER

SECTION

: PB (DECK A)

: PB (DECK B)

: REC (DECK B)

Q207

Q201

CE

CLK

DI

12

LOCK

MUTE

Q208,209

BIAS

SWITCH

Q252,253

6

Q351

TAPE (L)

4

TUNER (L)

3

CD (L)

2

B

CD

SECTION

CD L

LINE AMP

IC301

9VOL OUT

BUS REGISTER

IC501

REC MUTE

13

A/B

11

BIAS

12

PLAY MUTE

14

DI

2

CLK

3

STB

1
DI
CLK

CONT

11

4PLAY

5SOL A

6

SOL B

SOL A

DRIVE

Q505,506

M+12V

SWITCH

Q501,502

M+12V

SOL B

DRIVE

Q503,504

SHIFT REGISTER

IC502

CK

2

S/L

1

QH

9

CLK

3

B REC FWD

5

PHOTO A

11

A MODE SW

13

A HALF

6

PHOTO B

12B MODE SW

14

B HALF

MECHA
BLOCK

SFR501

MOTOR H/L

Q412

MUTE

D406

+5.6V

66 8829 31

G1 G13

Q'S

10

DATA IN

DATA

SENS2

LOCK

13

CLOK

43

SENS2

37

AMS

12

10

S/L

9

DATA IN

L

R

MD

JK301

R CH

MD (L)

5

: MD

1

REC OUT AMP

Q306

Q302

4

B REC REV

Q320

Q551
MUTE

L

R

LINE OUT

JK301

R CH

D405

µCON B+

VCC

D602
D601

RESET
SWITCH

POWER

DOWN DET

Q601

Q602

2

3

RM601

REMOTE
CONTROL

RECEIVER

RESET

38

POWER DOWN

6

REMOTE

8

VCC

VCCVCC

21.100 90

.

61

MD MUTE

32

VACS

36

SPEANA 4

SPEANA

35

SPEANA 334SPEANA 233SPEANA 1

13
10

8
5

.

.

(Page 18)

(Page 18)

(Page 18)

AC IN

F702

F703

SW401

AC IN

F702

GRX20 : AUS, RXD3 MODEL

AC VOLTAGE

GRX20:
E,SP,TW
MODELS

GRX20 : E,SP,TW,MX,AR MODELS

220 – 240 V

110 – 120 V

• Abbreviation
AUS : Australian model
SP : Singapore model
MX : Mexican model
AR : Argentina model
TW : Taiwan model

6-2. BLOCK DIAGRAMS

MAIN SECTION