Sony HCDRG-20 Service manual

HCD-DX10/RG4SR/RG20/RG30T

SERVICE MANUAL

Ver 1.2 2003. 11

• HCD-DX10/RG4SR/RG20/RG30T is the
tuner, deck, CD and amplifier section in
MHC-DX10/RG4SR/RG20/RG30T.

Photo : HCD-DX10

CD
Section

Tape deck Model Name Using Similar Mechanism NEW
Section T ape Transport Mechanism T ype CWL44FF29

US Model

HCD-RG4SR/RG20/RG30T

Canadian Model

HCD-RG20/RG30T

AEP Model

UK Model

HCD-RG20

E Model

Australian Model

HCD-DX10

Model Name Using Similar Mechanism NEW
CD Mechanism Type CDM58F-K6
Optical Pick-up Name

KSM-213D

AUDIO POWER SPECIFICATIONS:
(HCD-RG4SR USA model only)

POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:

with 6 ohm loads both channels driven, from
120 – 10,000 Hz; rates 100 watts per channel
minimum RMS power, with no more than 10%
total harmonic distortion from 250 milliwatts to
rated output.

Total harmonic distortion less than 0.07%

(HCD-RG30T USA model only)

POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:

with 6 ohm loads both channels driven, from
120 – 10,000 Hz; rates 75 watts per channel
minimum RMS power, with no more than 10%
total harmonic distortion from 250 milliwatts to
rated output.

Total harmonic distortion less than 0.07%

(HCD-RG20 USA model only)

POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:

with 6 ohm loads both channels driven, from
120 – 10,000 Hz; rates 60 watts per channel
minimum RMS power, with no more than 10%
total harmonic distortion from 250 milliwatts to
rated output.

Total harmonic distortion less than 0.07%

(6 ohms at 1 kHz, 50 W)

(6 ohms at 1 kHz, 30 W)

(6 ohms at 1 kHz, 30 W)

SPECIFICATIONS

Amplifier section

Canadian models:
HCD-RG30T

Continuous RMS power output (reference)

Total harmonic distortion less than 0.07%

HCD-RG20

Continuous RMS power output (reference)

Total harmonic distortion less than 0.07%

European model:
HCD-RG20

DIN power output (rated) 40 + 40 watts
Continuous RMS power output (reference)

Music power output (reference)

Other model:
HCD-DX10

The following measured at AC 120, 220, 240 V
50/60 Hz
DIN power output (rated) 40 + 40 watts

Continuous RMS power output (reference)

75 + 75 watts (6 ohms at 1
kHz, 10% THD)

(6 ohms at 1 kHz, 50 W)

60 + 60 watts (6 ohms at 1
kHz, 10% THD)

(6 ohms at 1 kHz, 30 W)

(6 ohms at 1 kHz, DIN)
50 + 50 watts (6 ohms at 1

kHz, 10% THD)
95 + 95 watts (6 ohms

at 1 kHz, 10% THD)

(6 ohms at 1 kHz, DIN)
50 + 50 watts (6 ohms at 1

kHz, 10% THD)

MINI HIFI COMPONENT SYSTEM

Inputs
GAME (AUDIO) IN (phono jack):

Outputs
PHONES (stereo mini jack):

Front speaker: accepts impedance of 6 to
Surround speaker (HCD-RG4SR only):

CD player section

System Compact disc and digital
Laser Semiconductor laser

Frequency response 2 Hz – 20 kHz (±0.5 dB)
Wavelength 780 – 790 nm
Signal-to-noise ratio More than 90 dB
Dynamic range More than 90 dB

Tape deck section

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

voltage 450 mV,
impedance 47 kilohms

accepts headphones of
8 ohms or more

16 ohms
accepts impedance of 6 to

16 ohms

audio system
(λ=780 nm)

Emission duration:
continuous

using Sony TYPE I
cassette

— Continued on next page —

9-873-225-03

2003K16-1
© 2003.11

Sony Corporation

Home Audio Company
Published by Sony Engineering Corporation

HCD-DX10/RG4SR/RG20/RG30T

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

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

AM tuner section

Tuning range
Pan-American models: 530 – 1,710 kHz (with the

European and Middle Eastern models:

Other models: 531 – 1,602 kHz (with the

Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz

General

Power requirements
North American models: 120 V AC, 60 Hz
European models: 230 V AC, 50/60 Hz
Australian models: 230 – 240 V AC,

Mexican models: 120 V AC, 50/60 Hz
Other models: 120 V, 220 V or

Power consumption
USA models:
HCD-RG4SR: 160 watts
HCD-RG30T: 115 watts
HCD-RG20: 95 watts
Canadian models:
HCD-RG30T: 115 watts
HCD-RG20: 95 watts
European model:
HCD-RG20: 85 watts

Other model:
HCD-DX10: 85 watts

Dimensions (w/h/d)
Mass

North American models:
HCD-RG4SR: Approx. 8.7 kg
HCD-RG30T: Approx. 8.2 kg
HCD-RG20: Approx. 7.8 kg
European model:
HCD-RG20: Approx. 8.1 kg
Other model:
HCD-DX10: Approx. 8.2 kg

Design and specifications are subject to change
without notice.

interval set at 10 kHz)
531 – 1,710 kHz (with the
interval set at 9 kHz)

531 – 1,602 kHz (with the
interval set at 9 kHz)

interval set at 9 kHz)
530 – 1,710 kHz (with the
interval set at 10 kHz)

50/60 Hz

230 – 240 V AC,
50/60 Hz
Adjustable with voltage
selector

1.0 watts (at the Power
Saving Mode)

Approx. 280 × 325 × 421 mm

SAFETY CHECK-OUT

After correcting the original service problem, perform the
following safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for A C leakage. Check leakage as
described below.

LEAKAGE

The A C leakag e from any exposed metal part to earth g round and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA
WT -540A. Follo w the manufacturers’ instructions to use these
instruments.

2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated A C voltmeter . The “limit” indication
is 0.75 V, so analog meters must have an accurate low-v olta ge
scale. The Simpson 250 and Sanwa SH-63Trd are e xamples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)

T o Exposed Metal

Parts on Set

AC

0.15 µF

1.5 kΩ

Earth Ground

Fig. A. Using an A C v oltmeter to check A C leakage.

Voltmeter
(0.75 V)

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH
MARK 0 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.

2

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS P AR UNE MARQUE 0 SUR LES
DIAGRAMMES SCHÉMA TIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.

HCD-DX10/RG4SR/RG20/RG30T

NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.

NOTES ON LASER DIODE EMISSION CHECK

The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick­up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.

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

This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.

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.

TABLE OF CONTENTS

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

2. DISASSEMBLY ································································ 6

3. TEST MODE ···································································· 11

4. ELECTRICAL ADJUSTMENTS ······························· 13

5. DIAGRAMS······································································ 15

5-1. Circuit Board Location ················································ 15
5-2. Block Diagrams ··························································· 16

Tuner/CD Section························································ 16

Main Section ······························································· 17
5-3. Printed Wiring Board CD Section ····························· 18
5-4. Schematic Diagram CD Section ································ 19
5-5. Printed Wiring Board Main Section ·························· 20
5-6. Schematic Diagram Main Section (1/4) ···················· 21
5-7. Schematic Diagram Main Section (2/4) ···················· 22
5-8. Schematic Diagram Main Section (3/4) ···················· 23
5-9. Schematic Diagram Main Section (4/4) ···················· 24
5-10.Printed Wiring Board Address Sensor,

Driver Motor Section··················································· 25
5-11.Printed Wiring Board Panel Section·························· 26
5-12.Schematic Diagram Panel Section ···························· 27
5-13.Printed Wiring Board Power Section ························ 28
5-14.Printed Wiring Board Trans Section ·························· 29
5-15.Schematic Diagram Trans Section ···························· 30
5-16.IC Block Diagrams ······················································ 31
5-17.IC Pin Function Description ········································ 34

6. EXPLODED VIEWS

6-1. Main Section ······························································· 36
6-2. Front Panel Section ····················································· 37
6-3. Main Board Section ····················································· 38
6-4. CD Mechanism Deck Section ····································· 39

7. ELECTRICAL PARTS LIST ······································· 40

MODEL IDENTIFICATION

— BACK PANEL —

PARTS No.

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.

• Abbreviation
CND : Canadian model
AUS : Australian model
AR : Argentina model
SP : Singapore model
TW : Taiwan model
MX : Mexican model
MY : Malaysia model
E2 : 120V AC Area in E model
E3 : 240V AC Area in E model
E51 : Chilean and Peruvian model

MODEL

RG20: US, CND models
RG20: AEP, UK models
DX10: E2, E3, E51, TW models
DX10: AUS, AR, MX models
RG30T
RG4SR
DX10: MY, SP models

PARTS No.

4-234-701-0s
4-234-701-1s
4-234-701-2s
4-234-701-3s
4-234-701-4s
4-234-701-5s
4-234-701-6s

3

HCD-DX10/RG4SR/RG20/RG30T

Main unit

SECTION 1

GENERAL

This section is extracted
from instruction manual.

12

wk
wj
wh
wg

wf
wd

ws

AUDIO jacks wd (19)
CD wk (10 – 12, 15)
CD SYNC qh (15)
Deck A ws (14)
Deck B qs (14 – 16)
DISC 1 – 3 4 (10, 11)
DISC SKIP EX-CHANGE 3

(10, 11)
Disc tray 5 (10)
DISPLAY w; (12)
EFFECT ON/OFF qd

(17)
GAME wg (18 – 20)

3456 7

qdqfqgqhqjqkqlw;wa

GAME EQ ql (17, 18, 20)
GROOVE 8 (17)
MOVIE EQ 7 (17)
MUSIC EQ 2 (17)
PHONES jack q;
REC PAUSE/START qg (15)
TAPE A/B wh (14, 15)
TUNER/BAND wj (12, 13, 15)
VIDEO jack wf (19, 20)
VOLUME control 9

BUTTON DESCRIPTIONS

?/1 (power) 1
Z OPEN/CLOSE 6
Z (deck B) qa
M (fast forward) qf
. (go back) qj
> (go forward) qj
X (pause) qj
H (play) qj
x (stop) qj
m (rewind) qk
Z (deck A) wa

8

9

q;

qa
qs

4

Remote Control

wa
w;

ql
qk
qj
qh

qg

HCD-DX10/RG4SR/RG20/RG30T

12 3 4

5
6

7
8

9
0
qa
qs

qd

CD ql (10 – 12, 15)
CLEAR w; (11)
CLOCK/TIMER SELECT 2

(16, 19)

CLOCK/TIMER SET 3 (9, 16,

18)
DISPLAY 6 (12)
D.SKIP 7 (10)
ENTER qg (9, 11 – 13, 16, 18,

19)
EQ +/– qf (17)
GAME q; (18 – 20)
GROOVE qd (17)

ON/OFF qh (17)
PLAY MODE wa (10, 11)
PRESET +/– 5 (13)
REPEAT 8 (11)
SLEEP 1 (18)
STEREO/MONO 8 (13)
SURROUND qa (17)
TAPE A/B 9 (14, 15)
TUNER MEMORY qj (12, 13)
TUNER/BAND qk (12, 13)
TUNING +/– 5 (12, 13)
VOL +/– qs

Setting the time

1

Press ?/1 to turn on the system.

2

Press CLOCK/TIMER SET on the
remote.

Proceed to step 5 when “CLOCK” appears
in the display.

3

Press . or > repeatedly to select
“SET CLOCK”.

4

Press ENTER on the remote.

5

Press . or > repeatedly to set the
hour.

qf

BUTTON DESCRIPTIONS

?/1 (power) 4
M (fast forward) 5
. (go back) 5
> (go forward) 5
X (pause) 5
N (play) 5
m (rewind) 5
x (stop) 5

6

Press ENTER on the remote.

The minute indication flashes.

7

Press . or > repeatedly to set the
minute.

8

Press ENTER on the remote.

Tip

If you made a mistake or want to change the time,
start over from step 2.

Note

The clock settings are canceled when you disconnect
the power cord or if a power failure occurs.

5

HCD-DX10/RG4SR/RG20/RG30T

Note : Disassemble the unit in the order as shown below.

Case (Top)

Set

CD door

SECTION 2

DISASSEMBLY

Front panel section and CD mechanism
deck (CDM58F-K6) section

Base unit

Panel board

Tape mechanism deck and Panel board

CD board

Sub trans board, Video out board and Trans board

Main board and Power board

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

2-1. CASE (TOP)

q;

Case (Top)

5

Two screws (Case 3 TP2)

qa

CD board, Driver board, Motor board and Address sensor board

9

Four screws (+BVTP 3

×

6)

Case (Side-L)

6

Screw (Case 3 TP2)

7

Two screws

(+BVTP 3

8

×

10)

q;

Case (Side-R)

4

3

Two

(+BVTP 3

1

Two screws (Case 3 TP2)

2

Screw (Case 3 TP2)

screws

×

10)

6

2-2. CD DOOR

CD mechanism deck (CDM58F-K6)

1

Turn the pulley to the direction of arrow.

HCD-DX10/RG4SR/RG20/RG30T

CD door

Front panel side

pulley

2

Pull-out the disc tray.

3

2-3. FRONT PANEL SECTION AND CD MECHANISM DECK (CDM58F-K6) SECTION

CD mechanism deck
(CDM58F-K6)

5

q;

Connector

(CN605)

2

Flat type wire (19 core)

4

Screw (+BVTP 3

qa

Three screws (+BVTP 3

×

qd

10)

7

Connector (CN202)

9

Screw

(+BVTP 3

qs

× 10

×

10)

)

1

Connector

(CN704)

6

Connector (CN201)

Screw

3

(+BVTP 3

×

Front panel section

10)

8

Connector (CN203)

7

HCD-DX10/RG4SR/RG20/RG30T

)

2-4. TAPE MECHANISM DECK AND PANEL BOARD

qa

PANEL board

1

Flat type wire (17 core)

2

(+BVTP 2.6

Six screws

8

(+BVTP 2.6

×

8)

Six screws

4

×

8)

9

Five screws

(+BVTP 2.6

q;

(+BVTP 2.6

Belt (BF)

×

8)

Eight screws

5

Belt (AF)

×

8)

7

Volume knob

3

Tape mechanism deck

2-5. SUB TRANS BOARD, VIDEO OUT BOARD AND TRANS BOARD

7

Screw (+BVTP 3

qk

Four screws

(+BVTT 4

TRANS board

×

Cover (duct)

8

SENSOR board

×

10)

6)

qs

VIDEO OUT board

1

Connector (CN901)

2

Connector (CN2)

6

6

Belt (FR

qa

Screw

(+BVTP 3

5

Two screws

(+BVTP 3

qd

Five screws

(+BVTP 3

qg

(+BVTP 3

×

10)

×

10)

×

10)

Two screws

×

10)

qj

Connector (CN915)

ql

Power

4

8

transformer (T911)

Connector (CN504)

3

Connector

(CN903)

q;

SUB TRANS

board

9

Two screws

(+BVTP 3

×

10)

qh

D

C fan (M961)

qf

Back panel

2-6. MAIN BOARD AND POWER BOARD

s

6

Three screws (+BVTP 3

×

HCD-DX10/RG4SR/RG20/RG30T

9

8)

Heat sink

8

Two screws (+BVTP 3

MAIN board

× 8)

7

5

Two screws (+BVTP 3

2-7. BASE UNIT

4

Turn the pulley to the direction of arrow.

POWER

board

×

16)

1

Pulley (B), chucking

2

3

4

MAIN board

1

Two screws (+BVTP 3

×

10)

pulley

5

Flat type wire (16 core)

Spring (insulator),
coil

qd

Two insulators

2

7

Holder (BU) assy

Base unit

Two

screws (+PTPWH M2.6)

3

Lever (lifter)

qs

6

Screw

(+PTPWH M2.6)

Two spring (insulator), coil

qd

Two insulators

qa

Screw (DIA. 12)

9

Two stoppers (BU)

Spring
(insulator),
coil

8

Two screws (+BVTP 2.6

q;

Two

screws

(+PTPWH M2.6)

×

8)

9

HCD-DX10/RG4SR/RG20/RG30T

2-8. CD BOARD, DRIVER BOARD, MOTOR BOARD AND ADDRESS SENSOR BOARD

q;

qa

Tray

3

Flat type wire

(8 core)

2

DRIVER board

Screw (+PTPWH 2.6

qs

Screw (+BVTP 2.6

8

×

8)

MOTOR board

×

8)

4

Two screws (+BVTP 2.6

6

Flat type wire (8 core)

5

Remove two solderings of turn motor (M721).

7

Connector

qd

ADDRESS SENSOR board

×

8)

1

Screw (+BVTP 2.6

9

Pull-out the Table.

×

8)

qf

Flat type wire (16 core)

qh

CD board

qg

Four

screws

(+BVTP 2.6

×

8)

10

SECTION 3

TEST MODE

HCD-DX10/RG4SR/RG20/RG30T

[Change-over of AM Tuner Step between 9 kHz and
10 kHz]

• A step of AM channels can be changed o ver between 9 kHz and
10 kHz.

Procedure:

1. Press ?/1 button to turn the set ON.

2. Select the function “TUNER”, and press TUNER/BAND

button to select the BAND “AM”.

3. Press ?/1 button to turn the set OFF.

4. Press TUNER/BAND and ?/1 buttons simultaneously, and

the display of fluorescent indicator tube changes to “AM 9 k
STEP” or “ AM 10 k STEP”, and thus the channel step is changed
over.

[Cold Reset]

• The cold reset clears all data including preset data stored in the
RAM to initial conditions. Execute this mode when returning
the set to the customer.

Procedure:

1. Press three buttons x , DISPLA Y , and ?/1 simultaneously.

2. The fluorescent indicator tube displays “COLD RESET” and

the set is reset.

[Aging Mode]

This mode can be used for operation check of CD section and tape
deck section.

• If an error occurred:
The aging operation stops and is displayed status.

• If no error occurs:
The aging operation continues repeatedly.

1. Operating method of Aging Mode

Turn on the main power and select “CD” of the function.

1) Set three discs in tray. Select ALL DISCS, and REPEAT OFF.

2) Load the tapes recording use into both decks.

3) Press three buttons x , DISPLAY , and

DISC SKIP EX-CHANGE simultaneously.

4) Aging operations of CD and tape are started at the same time.

5) To exit the aging mode, perform [Cold Reset].

2. Aging mode in CD section

1) Operation during aging mode

• In the agining mode ,the program is excuted in the following
sequence.

(1) The disc tray opens and closes.
(2) The disc tray turns to select a disc 3.
(3) The pickup accesses to the first track, and plays 3 seconds.
(4) The pickup accesses to the last track, and plays 3 seconds.
(5) The disc tray opens and closes.
(6) The disc tray turns to select a disc 1.
(7) The same operation starts like step (3).
(8) After a disc 1 aging operation, a disc 2 is selected.
(9) When an aging operation of a disc 3 is completed, the display

“AGING

∗∗∗∗” value increases.

(10) If no error occurs, the aging operation continues repeatedly.

2) Error display

Disc error

Display Error

E00D01022 Focus error (No disc)
E00D02022 Sub Q error (Focus is good)
E00D02023 TOC reading error
E00D02014 Access error (Unable within regular time)

Mechanism error

Display Error

E00M__E_0 Error during opening tray
E00M__C_2 EX-CHANGE disc error
E00M__D_0 Error during closing tray

E00M__F_3 EX-OPEN error
E00M__D_5 EX-CLOSE error
E00M__C_2 Chuck-up error
E00M__C_3 Unchucking error

3. Aging mode in Tape Deck section

1) Operation during aging mode

• In the agining mode, the program is excuted in the following
sequence.

Step

1

Rewind the TAPE A

2

Rewind the TAPE B

3

Play the TAPE A (1 minute)

4

Stop the TAPE A (1 second)

5

Play the TAPE A (3 minutes)

6

Rewind(AMS) the TAPE A

7

F.F.(AMS) the TAPE A

8

Play the TAPE B (1 minute)

9

Stop the TAPE B (1 second)

10

Record the TAPE B (3 minutes)

11

Rewind(AMS) the TAPE B

12

F.F.(AMS) the TAPE B

Operation

Display

TAPE AAG-1
TAPE BAG-2
TAPE AAG-2
TAPE AAG-3
TAPE AAG-4
TAPE AAG-5
TAPE AAG-6
TAPE BAG-2
TAPE BAG-3
TAPE BAG-4
TAPE BAG-5
TAPE BAG-6

2) Error display

• If error occurred, the display remains like “TAPE BAG-2”.

4. Exiting from the aging mode

• Be sure to perform Cold Reset to exit from the aging mode.

11

HCD-DX10/RG4SR/RG20/RG30T

[FL T ube Test Mode]

• All fluorecent segments and LEDs are tested.

Procedure:

1. Press ?/1 button to turn the set ON.

2. To enter the test mode, press the three buttons x , DISPLAY
and GROOVE simultaneously.

3. Press DISPLAY and DISC SKIP/EX-CHANGE buttons
simultaneously.

4. All segments and LEDs (without STANDBY LED) are turned
on.

5. To exit from this mode, press ?/1 button to turn the set OFF.

[Version and Destination Display Mode]

• The version or destination is displayed.

Procedure:

1. Press ?/1 button to turn the set ON.

2. To enter the test mode, press the three buttons x , DISPLAY
and GROOVE simultaneously.

3. Press DISPLAY and DISC 1 buttons simultaneously.

4. The version is displayed.

5. Press DISPLAY and DISC 2 buttons simultaneously.

6. The destination is displayed.

7. To exit from this mode, press ?/1 button to turn the set OFF.

[Key Check Mode]

• Keyboard check.

Procedure:

1. Press ?/1 button to turn the set ON.

2. To enter the test mode, press the three buttons x , DISPLAY
and GROOVE simultaneously.

3. Press DISPLAY and DISC 3 b uttons simultaneously, and the
key check mode is activated.

4. In the key check mode, the fluorecent indicator displays “KEY
0 VOL 0”. Each time a button is pressed, “KEY 0” value
increases. However, once a button is pressed, it is no longer
taken into account.
“VOL 0” value increases like 1, 2, 3 ... if rotating VOLUME
knob clockwise, or it decreases like 0, 9, 8, ... if rotating counter­clockwise.

5. To exit from this mode, press ?/1 button to turn the set OFF.

[VACS ON/OFF Mode]

• This mode is used to switch ON and OFF the VACS (Variable
Attenuation Control System).

Procedure:

1. Press ?/1 button to turn the set ON.

2. To enter the test mode, press the three buttons x , DISPLAY

and GROOVE simultaneously.

3. Press CD SYNC button while pressing DISPLAY button.

The message “VACS OFF” or “VACS ON” appears.

4. To exit from this mode, press ?/1 button to turn the set OFF.

[Equalizer Test Mode]

• This mode is used to test the function of the equalizer.

Procedure:

1. Press ?/1 button to turn the set ON.

2. To enter the test mode, press the three buttons x , DISPLAY

and GROOVE simultaneously.

3. Press m button while pressing DISPLAY b utton. The message

–

“BASS + 0” is displayed.

4. The value increases like + 2, + 4 ... if pressing > button

while DISPLAY button is still depressed, or it decreases like ­2, - 4 ... if pressing . button.

5. Press M button while pressing DISPLAY b utton. The message

+

“TRE + 0” is displayed.

6. The value increases like + 2, + 4 ... if pressing > button

while DISPLAY button is still depressed, or it decreases like

- 2, - 4 ... if pressing . button.

7. To exit from this mode, press ?/1 button to turn the set OFF.

[CD Ship Mode (No Memory Clear) ]

• This mode moves the pickup to the position durable to vibra­tion. Use this mode when returning the set to the customer after
repair.

Procedure:

1. Press ?/1 button to turn the set ON.

2. Press CD button and ?/1 button simultaneously.

3. The "STANDBY" display blinks instantaneously, and the CD

ship mode is set.

[CD Service Mode]

• This mode can run the CD sled motor freely . Use this mode, for
instance, when cleaning the pickup.

Procedure:

1. Press ?/1 button to turn the set ON.

2. Select the function “CD”.

3. To enter the test mode, press three buttons x , DISPLAY , and

GROOVE simultaneously.

4. Press DISPLAY and OPEN/CLOSE b uttons simultaneously.

5. The CD service mode is selected.

M

6. With the CD in stop status, press

to outside track, or press m button to inside track.

7. To exit from this mode, perform as follows:

–

b utton to move the pickup

+

1) Move the pickup to the most inside track.

2) Press ?/1 button to turn the set OFF.

Note: • Always move the pickup to most inside track when exiting from

this mode. Otherwise, a disc will not be unloaded.

• Do not run the sled motor excessively , otherwise the gear can be
chipped.

12

HCD-DX10/RG4SR/RG20/RG30T

AM RF Signal generator

30% amplitude
modulation by
400Hz signal
output level : as low as possible

AM ANTENNA terminal
(JK101)

set

r

SECTION 4

ELECTRICAL ADJUSTMENTS

TUNER SECTION

FM Tuned Level Adjustment

FM RF Signal generator

75

Ω

coaxial

set

Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 30 dB (at 75

Ω

open)

Procedure:

1. Supply a 98 MHz signal at 28 dB from the ANTENNA terminal.

2. Tune the set to 98 MHz.

3. Adjust RV101 to the point (moment) when the TUNED
indicator will change from going off to going on.

Adjustment Location: MAIN board

Null Adjustment

FM RF Signal generator

75

Ω

coaxial

Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 60 dB (at 75

Ω

open)

FM ANTENNA terminal
(JK101)

set

FM ANTENNA terminal
(JK101)

AM IF Adjustment

level mete

16 Ω

set

headphones jack (JK601)

Procedure:

1. Set the frequency of the AM RF signal generator to 1000 kHz
(at 10 kHz step) or 999 kHz (at 9 kHz step).

2. Tune the set to AM 1000 kHz (at 10 kHz step) or 999 kHz (at 9
kHz step).

3. Adjust IFT101 so that the reading on level meter becomes in
maximum.

Procedure:

1. Supply a 98 MHz signal at 60 dB from the ANTENNA terminal.

2. Tune the set to 98 MHz.

3. Measure voltage between pin 21 and pin 23 of IC 101. Adjust

Adjustment Location: MAIN board

[MAIN BOARD] Component side

T101 until the voltage becomes 0 V.

T101:NULL

T101

RV101

IFT101 : AM IF

RV101:FM TUNED LEVEL

13

HCD-DX10/RG4SR/RG20/RG30T

CD SECTION

Note :

1. CD Block is basically designed 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.

RF Level Check

oscilloscope

CD board

IC751 pin q;

GND

Procedure :

1. Connect oscilloscope to pin q; (IC751).

2. Turned Power switch on.

3. Load a disc (YEDS-18) and playback.

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

Note : Clear RF signal wavefor m means that the shape “ ◊ ” can be clearly

distinguished at the center of the waveform.

RF signal waveform

VOLT/DIV : 200mV
TIME/DIV : 500ns

level : 1.4 to 2.1 Vp-p

Adjustment Location: CD board

[CD BOARD] (Component Side)

CN732

CN731

TP connected to pin q; (IC751)
C746A

CN733

14

SECTION 5

DIAGRAMS

THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each bloc k.)

Note on Schematic Diagram:

• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.

• All resistors are in Ω and 1/
specified.

f

•

• C : panel designation.

• A : B+ Line.

• B : B– Line.

• H : adjustment for repair.

• Voltages and waveforms are dc with respect to ground

• V oltages are taken with a VOM (Input impedance 10 MΩ).

• Waveforms are taken with a oscilloscope.

• Circled numbers refer to waveforms.

• Signal path.

: internal component.

Note:

The components identi­fied by mark 0 or dotted
line with mark 0 are criti­cal for safety.
Replace only with part
number specified.

under no-signal (detuned) conditions.
Voltage variations may be noted due to normal produc-

tion tolerances.
no mark : FM
< >: CD
[ ] : T APE

Voltage variations may be noted due to normal produc­tion tolerances.

F : FM
E : PB (DECK A)
d : PB (DECK B)
G : REC (DECK B)
J : CD

4

W or less unless otherwise

Note:

Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro
spécifié.

Note on Printed Wiring Boards:

• X : parts extracted from the component side.

• b : Pattern from the side which enables seeing.

• Indication of transistor.

C

These are omitted.

Q

B

CE

These are omitted.

• Abbreviation
CND : Canadian model
AUS : Australian model
AR : Argentina model
SP : Singapore model
TW : T aiw an model
MX : Mexican model
MY : Malaysia model
E2 : 120V AC Area in E model
E3 : 240V AC Area in E model
E51 : Chilean and Peruvian model

Q

B

HCD-DX10/RG4SR/RG20/RG30T

5-1. CIRCUIT BOARD LOCATION

MOTOR board

ADDRESS SENSOR board

VIDEO OUT board

DRIVER board

E

TRANS board

PANEL board

POWER board

SPDL board
SENSOR board

CD board

SUB TRANS board

MAIN board

• WA VEFORMS

1

IC751 rf (XOUT)

59 ns

4.9Vp-p

– MAIN BOARD – – PANEL BOARD –– CD BOARD –

2

IC102 wf (XOUT)

222 µs

3

L251

16.6 µs

(60.1 kHz)

3.2Vp-p

14.1Vp-p

4

IC601 qj (XTAL 6.0MHz)

167 ns

4.8Vp-p

1515

HCD-DX10/RG4SR/RG20/RG30T

Ver 1.2 2003.11

5-2. BLOCK DIAGRAMS

TUNER/CD SECTION

EXCEPT RG20:AEP,UK

1

ANT IN

RG20:AEP,UK

1

ANT IN

RB101

1

3

FND1

IF OUT

OSC OUT

FND1

13

JK101

FM 75Ω

G

AM

1

FM IF

9

IF OUT

12

AM/IF

24

AM OSC

13

VCO STOP

8

IF REQ MUTE

20

AM RF IN

22

AM OSC

23

V REG

AM/FM IF MPX

IC101

AM MIX OUT

FM SD ADJ

STEREO

L OUT

R OUT

FMDET

TUNED

11

10

18AM IF IN

19

R-CH

IFT101

AM IF

3

5

6

7

+6.8V

RV101

FM TUNED

LEVEL

T101

NULL

Q106

MUTE

L-CH

DO,CLK

A

MAIN

SECTION

C

MAIN

SECTION

• R-CH is omitted due to same as L-CH

• Signal Path

: FM

: CD

MASTER CONTROL

IC601(1/2)

TUNED

10

TU STEREO

9

CX101

Q102

Q101

RF IF
AMP

10

24

15

18

17

19

1

FM

XIN

XOUT

FM OSC

VT1 IN

VT1

PD1

PLL

IC102

FM/AM IF

AM OSC

12

FM

7

14

2VCO STOP

8IF REQ

DI

6DO

DO

4DI

CLK

CL

5

CE

CE

3

7

8

VT

5

7IF OUT

8OSC OUT

5VT

14

4

55

1511

67

9

CF101 CF102

+B TU+12V

4.5MHz

OPTICAL PICK-UP

BLOCK

(KSM-213D)

DETECTOR

VCC

VC

A

B

C

D

E

F

LD

GND

PD

VR

FOCUS

COIL

TRACKING

COIL

SLED

MOTOR

TUNER MUTE OUT

DO

DI

CLK

CE

77

LC72131 BU2114 DO

95

LC72131 DI

96

CLK

97

LC72131 CE

93

CD A MUTE

6

CD WRQ

7

SQOUT

99

CD RESET OUT

3

COIN

98

SQCK

100

CD RWC

2

CD DRF

8

CD MOTOR-

CD NUMBER SENSOR

CD PIC UP/DOWN SW

IC701

73CD MOTOR +

9

4

MOTOR

74

68

70CD TRAY OPEN SW

71CD TRAY CLOSE SW

69

DRIVE

7

TBL ADDRESS

2

IC711

SENSOR

M

S701

OPEN/CLOSE

S711

BU UP/

DOWN

M721
TURN

MOTOR

122

ASP

IC731

+5V

Q731

LD

DRIVER

FCS/TRK COIL
SL/SP MOTOR

DRIVER

F+

1

F

2

T+

27

T

26

11

M

12

CH1 OUTA

CH1 OUTB

CH4 OUTA

CH4 OUTB

CH21 OUTB

CH2 OUTA

IC781

CH1 INA

CH1 INB

CH4 INA

CH2 INB

3

4

25

9

58

VR

2

FIN 1

1

FIN 2

3

E

4

F

62

LDD

63

LDS

16

FD

15

TO

29

SLD

DEF

TES

HFL

JP+

CV+

CV-

SLOF

DATA

DRF

41RF SM

44SLI

49

36

37

33

JP-

32

40

39

35TOFF

38

52

50CLK

51CL

53CE

34TGL
54

10

9

1

16

15

19

20

12

13

17

14

56

61

57

54

18

28

26

27

DSP

IC751

EFMI

EFMO

DEF

TES

HFL

JP+

JP-

CLV+

CLV-

TOFF

VP

COIN

4.2M

CQCK

RWC

TGL

SHUTER IN/OUT

D MUTE

LIMIT SW

L CH

WRQE

SQ0UT

PDO

37

40R CH

35L MUTE

53

55

45XI

XO

44

58RESET

R CH

D733

X701

16.9344M

3

D732

Q771,773

MUTE

D735

CD-L

B

MAIN

SECTION

SPINDLE

MOTOR

S01

LIMIT

18

M

CH3 OUTB

17

CH3 OUTA

CH3 INB

MUTE

20

7

27

SPD

Q775

SL+

SL-

31

30

5

4

CD SL+

CD SL-

1616

MAIN SECTION

TUNER

SECTION

CD

SECTION

TUNER

SECTION

VIDEO

OUT

VIDEO

INPUT

AUDIO

PB

HEAD

REC/PB
HEAD

ERASE

HEAD

MECHA DECK

A MODE

B MODE

A HALF

B HALF

REC(FWD)

LGAME

R

DECK-A

DECK-B

A

B

C

JK602

JK603

A PHOTO
SENSOR

B PHOTO
SENSOR

MOTOR H

MOTOR L

A SOL

B SOL

CAP M+

L-CH

LOUT

DO,CLK

R-CH

R-CH

R-CH

SFR601

L251
BIAS

Q203,205

PLAY/REC
CONTROL

Q604,607

A TRIG
DRIVE

Q603,606

B TRIG
DRIVE

Q605,608

CAP MOTOR

DRIVE

R-CH

Q201

MUTE

BIAS

OSC

Q214

Q209

PLAY/REC

SWITCH

81

TAPE SOL A

82

TAPE SOL B

80

MECHA VCC

Q210,213

BIAS

SWITCH

28

27

26

67

PHOTO SENSOR A

PHOTO SENSOR B

TAPE FWD REC SW B

XTAL 6.0MHZ

16

17

X601
6MHz

PB/REQ EQ AMP

IC201

CH1/A

1

CH1/B

2

REC OUT

9

Q211,212

SWITCH

66

65

TAPE B HALF25TAPE A HALF

TAPE MODE SW B

TAPE MODE SW A

XTAL 6.0MHZ

PRE OUT

REC IN

MIX OUT

TAPE A/B

FUCTION

S601-609

11

19

KEY INPUT0

19

KEY

5

6

86

TAPE REC

88

TAPE BIAS

Q320,321

AMS

91

20

FUCTION

KEY

S612-620

Q207

MUTE

24

AMS IN

TAPE A/B

KEY INPUT1

87

TAPE REC MUTE

KEY INPUT2

21

FUCTION

KEY

S623-629

Q215

MUTE

79

TAPE MUTE OUT (PB)

VOLUME

VR601

VR ENCODER A

VR ENCODER B

13

14

31

CLK

94

MASTER CONTROL

BD3871 DATA/LATCH

POWER SW

84

Q651

LED

DRIVER

AUDIO SOUND

B1

7

A1

5

SC

13

C1

9

SI

14

IC601(2/2)

LED601

(POWER)

PROCESSOR

IC301

OUT1

17

OUT2

SEL1

MN1

R-CH

16

Q303

4

BUFFER

1

IC302

P1 P22

..

47 50 52 6340 45

VF VF

FLOURESCENT

INDICATOR TUBE

FLD601

3

1

22

SPEANA IN L

76

SYSTEM MUTE OUT

1G 10G

39 33

Q803,804

MUTE
CONT

Q316

MUTE

78

STK MUTE

83

Q503,504

MUTE
CONT

75

SPK RELY ON

POW SAVE

REMOTE IN

29

1

Q581

MUTE

DO

CLK

92

RESET

POWER DOWN IN

12

11

IC501

POWER

AMP

12

RG30T/RG4SR

TH501

IC602

1

LED

DRIVER

2

3

1

CD ON/OFF

BU2114 LATCH

Q602 Q601

RESET

SWITCH

HCD-DX10/RG4SR/RG20/RG30T

RG4SR

JK311

L

SURROUND SPK

R CH

JK310

6

Q501

OVER LOAD
DETECTOR

Q582,583

OVER HEAT
DETECTOR

LED602-609

16

13

+5V

RESET

RM601

REMOTE

3

D809 -810

D601

REG

IC804

D602

CD +5V

FAN +B

LED +5.6V

TU +B

TU +12V

TC +12V

M +9V

CD +7V

µCOM +B

Q584

FAN ON

SWITCH

1

Q308,309

PROTECT

DETECTOR

Q801,802

CD POWER

SWITCH

IC803

+5V

3

REG

2

IC802

+12V

3

REG

IC801

+9V

3

REG

D502

D311

MAIN TRANS

1

RL1

T911

D902-905

Q901

RELAY
DRIVE

D852

RY901

R CH

R CH

RG30T,RG4SR

Q850,851

FAN

DRIVE

• R-CH is omitted due to same as L-CH

• Signal Path

T901

SUB TRANS

Q314,315

RELAY

Q311

PROTECT

CONT

Q305

Q306

MUTE

MUTE

CONT

-VP

+B

POWER

AMP

-B

1

D811

1

1

D543 D542

EVER +5.6V

Q312

PROTECT

SWITCH

Q911

-30V
REG

D541

D801-804

D812-815

DRIVE

VF

VF

IC901

+5.6V

3

REG

OUTPUT

R

L

SPEAKER

R

JK601

PHONES

FAN

(M961)

: PB (DECK A)

: PB (DECK B)

: REC (DECK B)

: FM

: CD

DX10:AR,AUS

JW7

RG20:AEP,UK

JW6

DX10:MX/RG20:US,CND
/RG30T/RG4SR

DX10:MX

DX10:AR,AUS/RG20
/RG30T/RG4SR

DX10:MX,MY,SP,

JW5

220/230

JW2

JW3

JW1

JW4

TW,E2,E3,E51

240

120

S901

VOLTAGE

SELECTOR

DX10:MY,SP,

TW,E2,
E3,E51

AC
IN

1717