SONY HCD-GX25, HCD-RG220 Service Manual

HCD-GX25/RG220

SERVICE MANUAL

Ver 1.0 2003. 08

• HCD-GX25/RG220 is the tuner, deck, CD and amplifier section in MHC-GX25/RG220.

(Photo: HCD-GX25)

CD CDM74F-K6BD72 Section

Tape Deck Model Name Using Similar Machanism HCD-GX45/RG440 Section Tape Transport Mechanism Type CWM43FF-13

US Model

Canadian Model

HCD-GX25

AEP Model

UK Model

E Model

Australian Model

HCD-RG220

Model Name Using Similar Mechanism HCD-GX45/RG440

CD Mechanism Type

Base Unit Name

Optical Pick-up Block KSM-213DCP

CDM74F-K6BD71A

BU-K6BD71A BU-K6BD72

AUDIO POWER SPECIFICATIONS (HCD-GX25 USA model only) POWER OUTPUT AND TOTAL HARMONIC DISTORTION:

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

Amplifier section

North American models: HCD-GX25:

Continuous RMS power output (reference):

120 + 120 watts (6 ohms at 1 kHz, 10% THD)

Total harmonic distortion less than 0.07% (6 ohms at

1 kHz, 60 W)

European and Russian models: HCD-RG220:

DIN power output (rated): 50 + 50 watts

(6 ohms at 1 kHz, DIN)

Continuous RMS power output (reference):

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

Music power output (reference):

120 + 120 watts (6 ohms at 1 kHz, 10% THD)

SPECIFICATIONS

Other models: HCD-RG220:

The following measured at AC 120, 127, 220, 240 V, 50/60 Hz DIN power output (rated): 80 + 80 watts

(6 ohms at 1 kHz, DIN)

Continuous RMS power output (reference):

100 + 100 watts (6 ohms at 1 kHz, 10% THD)

Inputs GAME INPUT AUDIO L/R (phono jacks):

voltage 250 mV, impedance 47 kilohms

GAME INPUT VIDEO (phono jack):

1 Vp-p, 75 ohms Outputs PHONES (stereo mini jack):

accepts headphones of

8 ohms or more VIDEO OUT (phono jack):max. output level

1 Vp-p, unbalanced, Sync

negative, load impedance

75 ohms SPEAKER: accepts impedance of 6 to

16 ohms

– Continued on next page –

COMPACT DISC DECK RECEIVER

9-961-149-01

Sony Corporation

Home Audio Company Published by Sony Engineering Corporation

HCD-GX25/RG220

CD player section

System Compact disc and digital

audio system

Laser Semiconductor laser

(λ=780 nm) Emission duration:

continuous 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 50 – 13,000 Hz (±3 dB),

using Sony TYPE I

cassettes

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range Russian models 65.0 – 74.0 MHz

(There is no stereo effect)

87.5 – 108.0 MHz Other models 87.5 – 108.0 MHz Antenna FM lead antenna Antenna terminals 75 ohms unbalanced Intermediate frequency 10.7 MHz

AM tuner section

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

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

European, Russian, Middle Eastern and Philippine models:

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

Other models: 530 – 1,710 kHz (with the tuning

interval set at 10 kHz) 531 – 1,602 kHz (with the tuning

interval set at 9 kHz) Antenna AM loop antenna Antenna terminals External antenna terminal Intermediate frequency 450 kHz

Power consumption USA model: HCD-GX25: 120 watts European and Russian models: HCD-RG220: 80 watts

0.35 watts (at the Power

Saving Mode) Other models: HCD-RG220: 110 watts

Dimensions (w/h/d) Approx. 280 × 325 × 407 mm

Mass North American models: HCD-GX25: Approx. 8.5 kg European and Russian models: HCD-RG220: Approx. 8.5 kg Other models: HCD-RG220: Approx. 8.5 kg

Design and specifications are subject to change without notice.

MODEL IDENTIFICATION

– BACK PANEL –

PARTS No.

General

Power requirements North American models: 120 V AC, 60 Hz European and Russian models:

230 V AC, 50/60 Hz Australian model: 230 – 240 V AC, 50/60 Hz Argentine model: 220 V AC, 50/60 Hz Mexican model: 127 V AC, 60 Hz Saudi Arabian model: 120 – 127 V/220 V or

230 – 240 V AC,

50/60 Hz

Adjustable with voltage

selector Korean model: 220 V AC, 60 Hz Other models: 120 V, 220 V or 230 –

240 V AC, 50/60 Hz

Adjustable with voltage

selector

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 P ARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

MODEL PARTS No.

GX25: US, CND 4-244-697-01 RG220: EXCEPT EA 4-244-697-21 RG220: EA 4-244-697-51

• Abbreviation CND : Canadian model EA : Saudi Arabia model

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!!

LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE 0 SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

HCD-GX25/RG220

SAFETY CHECK-OUT

After correcting the original service problem, perform the following safety check 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 TEST

The AC leakage from any exposed metal part to earth ground 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. Follow 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 V OM or battery-operated A C v oltmeter. The “limit” indication is 0.75 V, so analog meters must have an accurate lo w-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A)

CAUTION

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

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

The laser diode in the optical pick-up block may suffer electrostatic breakdown 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.

To Exposed Metal Parts on Set

0.15µF

1.5k

Ω

Earth Ground

AC voltmeter (0.75V)

Fig. A. Using an AC voltmeter to check AC leakage.

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.

SETTING AND RELEASING THE CD DISC TRAY LOCK FUNCTION

This set has a disc tray lock function to prevent discs for demonstration at shops from theft. While this lock function is set, the tray will not be delivered out even when the OPEN/CLOSE button is pressed.

Setting method:

Press the OPEN/CLOSE button while pressing the STOP button. After a few seconds, the message “LOCKED” will appear on the fluorescent indicator tube with the tray locked.

Releasing method:

Just as the lock is set, press the OPEN/CLOSE button while pressing the STOP button. After a few seconds, the message “UNLOCKED” will appear with the lock released.

LASER DIODE AND FOCUS SEARCH OPERATION CHECK

Carry out the “S curve check” in “CD section adjustment” and check that the S curve waveforms is output three times.

HCD-GX25/RG220

1. GENERAL

Main Unit ................................................................................ 5

Remote Control ....................................................................... 6

2. DISASSEMBLY

2-1. Case (Top) ........................................................................... 9

2-2. CD Door .............................................................................. 9

2-3. CD Mechanism Block ....................................................... 10

2-4. Front Panel Section ........................................................... 11

2-5. Tape Mechanism Deck ...................................................... 12

2-6. Panel Board, 1 Stream Led Board, Remote Board............ 12

2-7. Game Jack Board, H/P Jack Board ................................... 13

2-8. Back Panel Section............................................................ 13

2-9. Main Board ....................................................................... 14

2-10. Power Amp Board ............................................................. 14

2-11. SW Board, Driver Board................................................... 15

2-12. Base Unit ...........................................................................15

2-13. Sensor Board ..................................................................... 16

2-14. Motor (TB) Board ............................................................. 17

2-15. Motor (LD) Board ............................................................. 17

2-16. BD Board .......................................................................... 18

3. TEST MODE ..................................................................... 19

4. ELECTRICAL ADJUSTMENTS.................................22

5. DIAGRAMS

5-1. IC Pin Descriptions ........................................................... 23

5-2. Block Diagram –CD Section–........................................... 27

5-3. Block Diagram –Tuner/Tape/Panel Section– ....................28

5-4. Block Diagram –Amp/Power Supply Section–................. 29

5-5. Note for Printed Wiring Boards

and Schematic Diagrams .................................................. 30

5-6. Waveforms......................................................................... 30

5-7. Circuit Boards Location .................................................... 30

5-8. Printed Wiring Board –CD Mechanism Section (1/2)

(HCD-GX25/RG220: Except AEP, UK, Russia Model)– . 31 5-9. Printed Wiring Board –CD Mechanism Section (1/2)

(HCD-RG220: AEP, UK, Russia Model)– ........................ 32

5-10. Schematic Diagram –CD Mechanism Section (1/2)– ....... 33

5-11. Printed Wiring Boards –CD Mechanism Section (2/2)– ...34

5-12. Schematic Diagram –CD Mechanism Section (2/2)– ....... 35

5-13. Schematic Diagram –Main Section (1/4)– ........................ 36

5-14. Schematic Diagram –Main Section (2/4)– ........................ 37

5-15. Schematic Diagram –Main Section (3/4)– ........................ 38

5-16. Schematic Diagram –Main Section (4/4)– ........................ 39

5-17. Printed Wiring Board –Main Section– .............................. 40

5-18. Printed Wiring Boards and Schematic Diagram

–Jack Section– ................................................................... 41

5-19. Printed Wiring Boards –Panel Section– ............................ 42

5-20. Schematic Diagram –Panel Section– ................................ 43

5-21. Schematic Diagram –Power Amp Section (1/2)– ............. 44

5-22. Schematic Diagram –Power Amp Section (2/2)– ............. 45

5-23. Printed Wiring Board –Power Amp Section

(HCD-GX25/RG220:

Except AEP, UK, Russia, EA Model)– ............................. 46

5-24. Printed Wiring Board –Power Amp Section

(HCD-RG220: AEP, UK, Russia Model)– ........................ 47

5-25. Printed Wiring Board –Power Amp Section

(HCD-RG220: EA Model)– .............................................. 48

5-26. Printed Wiring Board –Transformer Section

(HCD-GX25/RG220:

Except AEP, UK, Russia, EA Model)– ............................. 49

5-27. Printed Wiring Board –Transformer Section

(HCD-RG220: AEP, UK, Russia Model)– ........................ 50

5-28. Printed Wiring Board –Transformer Section

(HCD-RG220: EA Model)– .............................................. 51

5-29. Schematic Diagram –Transformer Section

(HCD-GX25/RG220: Except EA Model)– ....................... 52

5-30. Schematic Diagram –Transformer Section

(HCD-RG220: EA Model)– .............................................. 53

5-31. IC Block Diagrams............................................................ 54

6. EXPLODED VIEWS

6-1. Main Section ..................................................................... 56

6-2. Front Panel Section (1)...................................................... 57

6-3. Front Panel Section (2)...................................................... 58

6-4. Front Panel Section (3)...................................................... 59

6-5. Main Board Section .......................................................... 60

6-6. CD Mechanism Deck Section (1) ..................................... 61

6-7. CD Mechanism Deck Section (2) ..................................... 62

6-8. Base Unit Section ..............................................................63

7. ELECTRICAL PARTS LIST ........................................ 64

SECTION 1

GENERAL

HCD-GX25/RG220

This section is extracted from instruction manual.

HCD-GX25/RG220

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

SET

2-1. CASE (TOP)

(Page 9)

2-2. CD DOOR

(Page 9)

2-3. CD MECHANISM BLOCK

(Page 10)

2-11. SW BOARD,

DRIVER BOARD (Page 15)

2-13. SENSOR BOARD

2-14. MOTOR (TB) BOARD

2-15. MOTOR (LD) BOARD

SECTION 2

DISASSEMBLY

(Page 16)

(Page 17)

2-12. BASE UNIT

(Page 15)

2-16. BD BOARD

(Page 18)

2-4. FRONT PANEL SECTION

(Page 11)

2-6. PANEL BOARD,

1 STREAM LED BOARD, REMOTE BOARD (Page 12)

2-5. TAPE MECHANISM DECK

2-7. GAME JACK BOARD,

2-8. BACK PANEL SECTION

(Page 13)

2-9. MAIN BOARD

(Page 14)

2-10. POWER AMP BOARD

(Page 14)

(Page 12)

H/P JACK BOARD (Page 13)

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

)

2-1. CASE (TOP)

HCD-GX25/RG220

two screws (case 3 TP2)

screw (case 3 TP2)

(+BVTP 3

case (side-L)

screw

case (top)

10)

screw

(+BVTP 3

10)

two screws (+BVTP 3

case (side-R)

10)

screw

(+BVTP 3

two screws

(case 3 TP2)

2-2. CD DOOR

CD mechanism deck (CDM74F-K6BD71A or CDM74F-K6BD72)

Turn the pulley to the direction of arrow.

pulley

Front panel side

Pull-out the disc tray.

CD door

(+BVTP 3

screw (case 3 TP2)

screw

10)

HCD-GX25/RG220

)

2-3. CD MECHANISM BLOCK

MAIN board

screw

(+BVTP 3

CD mechanism block

CN701

10)

three

(+BVTP 3

screws

CN312 (flat type)

10)

MAIN board

screw

(+BVTP 3

2-4. FRONT PANEL SECTION

(+BVTP 3

screw

10)

TRANS board

CN311 (flat type)

CN003

HCD-GX25/RG220

CN305

front panel section

CN304 (flat type)

three screws (+BVTT 3

CN310

× 6

CN202

)

CN203

HCD-GX25/RG220

)

2-5. TAPE MECHANISM DECK

connector

tape mechanism deck

six

screws

(+BVTP 2.6

2-6. PANEL BOARD, 1 STREAM LED BOARD, REMOTE BOARD

three

(+BVTP 2.6

CN607

REMOTE board

screws

two

(+BVTP 2.6

1 STREAM LED board

screws

two

(+BVTP 2.6

three

(+BVTP 2.6

PANEL board

screws

two

(+BVTP 2.6

two

screws

volume knob

2-7. GAME JACK BOARD, H/P JACK BOARD

two

screws

(+BVTP 2.6

GAME JACK boar

screw

(+BVTP 2.6

HCD-GX25/RG220

2-8. BACK PANEL SECTION

back panel section

H/P JACK board

screw

(+BVTP 3

two

screws

(+BVTP 3

10)

CN303

chassis section

CN101 (flat type)

two

screws

(+BVTT 3

HCD-GX25/RG220

2-9. MAIN BOARD

MAIN board

MAIN boar

2-10. POWER AMP BOARD

CN902

(+BVTP 3

screw

(+BVTP 3

screw

10)

screw

(+BVTT 3

two

screws

(+BVTT 3

8) two claws

screw

(+BVTT 3

POWER AMP boar

2-11. SW BOARD, DRIVER BOARD

SW board

CN702 (flat type)

CN703

DRIVER boar

HCD-GX25/RG220

CN704

screw

(+BTTP (M2.6))

2-12. BASE UNIT (CDM74F-K6BD71A, CDM74F-K6BD72)

holder (213) assy

base unit

two

screws

(+BTTP (M2.6))

floating

(+PTPWH M2.6)

two

insulators

screw

two

three

(insulator)

coil springs

three stoppers (BU)

(BTTP M2.6)

insulators

three screws

coil springs

floating

(+PTPWH M2.6)

screws

HCD-GX25/RG220

2-13. SENSOR BOARD

tray

floating

(+PTPWH M2.6)

floating

(+PTPWH M2.6)

gear (geneva)

screw

(+BTTP (M2.6))

screw

SENSOR board

CN731

belt (table)

floating

(+PTPWH M2.6)

screw

pulley (table)

2-14. MOTOR (TB) BOARD

claw

table motor assy (M741)

HCD-GX25/RG220

2-15. MOTOR (LD) BOARD

Remove the two solderings of motor.

loading motor assy (M751)

MOTOR (TB) board

Remove the two solderings of motor.

two

screws

(+BTTP (M2.6))

two

screws

(+BTTP (M2.6))

MOTOR (LD) board

belt (loading)

HCD-GX25/RG220

)

2-16. BD BOARD (BU-K6BD71A, BU-K6BD72)

BD board

Remove the two solderings of motor.

base unit

screw

(+BTP 2.6

CN708 (flat type

Remove the two solderings of motor.

SECTION 3

TEST MODE

HCD-GX25/RG220

[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 the [POWER] key to turn the power ON.

2. Press three keys of x , [GROOVE] and [POWER] simultaneously.

3. The message “COLD RESET” is displayed on the fluorescent

indicator tube momentarily, then becomes standby states.

[TUNER STEP CHANGE-OVER]

(Except AEP and UK models)

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

Procedure:

1. Press the [POWER] key to turn the power ON.

2. Press the [TUNER BAND] key to select “AM”.

3. Press the [POWER] key to turn the power OFF.

4. Press two keys of [TUNER/BAND] and [POWER] simultaneously.

5. The message “9K STEP” or “10K STEP” is displayed on the

fluorescent indicator tube, and thus the channel step is changed over.

[CD SHIP MODE]

•This mode moves the optical pick-up to the position durable to vibration. Use this mode when returning the set to the customer after repair.

Procedure:

1. Press the [POWER] key to turn the power ON.

2. Press the [CD] key to select “CD”.

3. Press two keys of [CD] and [POWER] simultaneously.

4. The message “LOCK” is displayed on the fluorescent indicator

tube, and the CD ship mode is set.

[CD TRAY LOCK MODE]

•This mode is used to unable to take sample disc out of tray in the shop.

Procedure:

1. Press the [POWER] key to turn the power ON.

2. Press the [CD] key to select “CD”.

3. Set disc on the tray.

4. While pressing the x key, press the Z key for 5 seconds.

5. The message “LOCKED” is displayed on the fluorescent

indicator tube and the tray is locked. (Even if pressing the Z key, the message “LOCKED” is displayed on the fluorescent indicator tube and the tray is locked)

6. To release from this mode, while pressing the x key, press

the Z key for 5 seconds.

7. The message “UNLOCKED” is displayed on the fluorescent

indicator tube and the tray is unlocked.

[AMP TEST MODE]

•This mode is used to set the parameter of AMP IC for adjustment of tone quality and VACS level and display VACS status.

Procedure:

1. Press the [POWER] key to turn the power ON.

2. Press three keys of x , [GAME EQ] and [EFFECT ON/OFF]

simultaneously.

3. When the AMP test mode is activated, the message “AMP

TEST” is displayed on the fluorescent indicator tube momentarily.

4. Press two keys of [GAME EQ] and [DISC 2] simultaneously, mode

is changed over to parameter setting of AMP IC and display of VACS status.

5. When the VACS status, the message VACS level, VACS signal

level, and VACS signal hold level is displayed on the fluorescent indicator tube.

6. Press the [GROOVE] key, DBFB ON/OFF is changed over.

7. Press the [GAME MIXING] key, surround ON/OFF is changed

over.

8. To release from this mode, press two keys of [GAME EQ] and

[MOVIE EQ] simultaneously.

HCD-GX25/RG220

[AGING MODE]

• This mode can be used for operation check of CD section and tape deck section. CD section and tape deck section work in parallel.

If an error occurred:

The aging operation stops only an error occurred sections and display then status.

If no error occurs:

The aging operation continues repeatedly.

Procedure:

1. Press the [POWER] key to turn the power ON.

2. Press the [CD] key to select “CD”.

3. Set disc on the tray and set tape into the deck.

4. Set the “ALL DISCS” mode and “REV OFF” mode.

5. Press three keys of x , [GAME EQ] and [DISC SKIP/EX-CHANGE]

simultaneously.

6. The message “AGING” is displayed on the fluorescent

indicator tube momentarily, then aging operations of CD and tape are started at the same time.

7. To release from this mode, operate the “COLD RESET”.

1. Display at the Aging Mode

Display operating state of CD section and tape deck section alternately. If an error occurred, stop display which that section.

2. CD Section

The sequence during the aging mode is following as below. Display at the aging mode is the same as the normal operation.

Aging mode sequence (CD section) :

3. Tape Deck Section

The sequence during the aging mode is following as below. If an error occurred, stop display that step.

Aging mode sequence (tape deck section) :

Rewind the tape A and B

“AAG-1 or 2”

Shut off

FWD play the tape A

“AAG-3”

2 minutes

Fast forward the tape A

“AAG-4”

Shut off or 20 seconds

REV play the tape A

“AAG-5”

2 minutes

Rewind the tape A

“AAG-6”

Shut off

FWD play the tape B

“BAG-3”

Start (from disc 1)

Disc chucking

TOC read

Play first track for 2 seconds

Play last track for 2 seconds

EX-change open/close

Open the disc tray

Disc skip

Close the tray

Change the next disc.

2 minutes

Fast forward the tape B

“BAG-4”

Shut off or 20 seconds

REV play the tape B

“BAG-5”

2 minutes

Rewind the tape B

“BAG-6”

Shut off

Note: “*AG-*” is display of each step.

HCD-GX25/RG220

[GC TEST MODE]

• This mode is used to check the fluorescent indicator tube, LED and key.

Procedure:

1. Press the [POWER] key to turn the power ON.

2. Press three keys of x , [GAME EQ] and [DISC 2] simultaneously.

3. Fluorescent indicator tube and LEDs are all turned ON.

4. Press two keys of [GAME EQ] and [DISC 2] simultaneously, mode

is changed over.

5. In the key check mode, press each key, the defined key number

of every each key list is displayed on the fluorescent indicator tube.

6. In the key count check mode, “KEYCNT 0” is displayed on the

fluorescent indicator tube. Each time a key is pressed, “KEYCNT” value increases. Howev er , once a key is pressed , it is no longer taken into account.

7. In the headphone input check mode, connect the headphone,

the message “H_P ON” is displayed on the fluorescent indicator tube, and disconnect the headphone, the message “H_P OFF” is displayed on the fluorescent indicator tube.

8. In the volume check mode, turn the [VOLUME] knob, the

display on the fluorescent indicator tube is changed over to “VOLUME UP”, “VOLUME FLAT” or “VOLUME DOWN”

[MC TEST MODE]

•This mode is used to check operations of Amplifier.

Procedure:

1. Press the [POWER] key to turn the power ON.

2. Press three keys of x , [GAME EQ] and [DISC 3] simultaneously.

3. When the MC test mode is activated, the message “TEST

MODE” is displayed on the fluorescent indicator tube momentarily, then VACS level is displayed on the fluorescent indicator tube.

4. Press the [MUSIC EQ] key, the display on the fluorescent

indicator tube is changed over to “GEQ MAX”, press the [EFFECT ON/OFF] key, the display on the fluorescent indicator tube is changed over to “GEQ FLAT”, press the [MOVIE EQ] key, the display on the fluorescent indicator tube is changed over to “GEQ MIN”,

5. Turn the [VOLUME] knob, the display on the fluorescent

indicator tube is changed over to “VOLUME MAX”, “V OLUME 16” or “VOLUME MIN”

6. Press the [GROOVE] key, VACS ON/OFF is changed over.

7. When the [REC PAUSE/START] ke y is pressed with a ta pe set in

the deck-B, the function is switched “MD” or “VIDEO” and recording starts. When the m or M key is pressed during recording, the tape is rewound back to the beginning of recording, the function is switched to “T APE B”, then playback starts.

8. When the [CD SYNC] key is pressed with the test tape (AMS-

100, AMS-110A) in the deck, number of space between tunes is counted, then if AMS-110A is set, “OK” is displayed on the fluorescent indicator tube and if AMS-100 is set, “NG” is displayed on the fluorescent indicator tube.

9. To release from this mode, press the [POWER] key.

[MODEL, DESTINATION AND VERSION DISPLAY]

•This mode is used to check the model, destination and software version.

Procedure:

1. Set to the standby state.

2. Press three keys of x , [GAME EQ] and [MOVIE EQ]

simultaneously.

3. When the model, destination and version display mode is

activated, the model an destination is displayed on the fluorescent indicator tube.

4. Press two keys of [GAME EQ] and [DISC 2] simultaneously, mode

is changed over to model and destination display mode and version display mode.

5. To release from this mode, press the two keys of [GAME EQ]

and [MOVIE EQ] simultaneously.

[CD ERROR CODE DISPLAY]

• This mode can be used for error display of CD section.

Procedure:

1. Press the [POWER] key to turn the power ON.

2. Press the [CD] key to select “CD”.

3. Press three keys of x , [GAME EQ] and [DISC 1] simultaneously.

Note: Error code is not displayed on the fluorescent indicator tube.

[CD SERVICE MODE]

•This mode can run the CD sled motor freely. Use this mode, for instance, when cleaning the optical pick-up.

Procedure:

1. Press the [POWER] key to turn the power ON.

2. Press the [CD] key to select “CD”.

3. Press three keys of x , [GAME EQ] and Z simultaneously.

4. When the CD service mode is activated, the message

“TRA VERS ON” is displa yed on the fluorescent indicator tube.

5. Press the M key, optical pick-up move to outside track and

the message “SLED OUT” is displayed on the fluorescent indicator tube.

6. Press the m key, optical pick-up move to inside track and

the message “SLED IN” is displayed on the fluorescent indicator tube..

7. Press the [MOVIE EQ] key, traverse ON/OFF is changed over.

[5 REPEAT LIMIT CANCEL]

• Number of repeat for CD playback is 5 times when the repeat mode is “REPEAT”. This mode is used to enables CD to repeat playback for limitless times.

Procedure:

1. Press the [POWER] key to turn the power ON.

2. Press the [CD] key to select “CD”.

3. Press three keys of x , [GAME EQ] and G simultaneously.

HCD-GX25/RG220

SECTION 4

ELECTRICAL ADJUSTMENTS

CD SECTION

Note:

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

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

3. Use an oscilloscope with more than 10MW 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.

S-CURVE CHECK

Oscilloscope

BD board

TP(FE) TP(VC)

Procedure :

1. Connect an oscilloscope to TP (FE) and TP (VC).

2. Turn the power on.

3. Load a disc (YEDS-18) and actuate the focus search. (In consequence of open and close the disc tray, actuate the focus search)

4. Confirm that the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 3 ± 0.5 Vp-p.

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

clearly distinguished at the center of the waveform.

RF signal waveform

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

level : 1.3

0.3Vp-

Connecting Location: BD board

• HCD-GX25/RG220: Except AEP, UK, Russia Model

– BD Board (Conductor side) –

S-curve waveform

symmetry

within 3

0.5Vp-

Note: •Try to measure several times to make sure than the ratio

of A : B or B : A is more than 10 : 7.

•Take sweep time as long as possible and light up the brightness to obtain best waveform.

RF LEVEL CHECK

BD board

TP(RF) TP(VC)

Procedure :

1. Connect an oscilloscope to TP (RF) and TP (VC).

2. Turn the power on.

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

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

oscilloscope

TP (VC)

TP (FE)

TP (RF)

IC721

• HCD-RG220: AEP, UK, Russia Model

– BD Board (Conductor side) –

TP (RF)

TP (VC)

IC721

TP (FE)

TP (TE)

HCD-GX25/RG220

SECTION 5

DIAGRAMS

5-1. IC PIN DESCRIPTIONS

• IC309 BU2099FV (MULTI CONTROLLER) (MAIN BOARD)

Pin No. Pin Name I/O Pin Description

1 VSS — Ground pin 2NC—Not used. (Open) 3DATAISerial data input from the tape mechanism controller 4 CLOCK I Serial data transfer clock signal input from the system controller 5 LCK I Serial data latch pulse clock signal input from the system controller 6 REC O Recording on/off control signal output “L”: recording 7BIAS O Recording bias on/off control signal output “L”: bias on

8A/BO

9 PB MUTE O

10 REC MUTE O

11 TUNER MUTE O Tuner muting on/off control signal output to the tuner unit “H”: muting on 12 LM-R (CD) O Loading motor drive signal output 13 LM-L (CD) O Loading motor drive signal output 14 TM-R (CD) O Table motor drive signal output 15 TM-L (CD) O Table motor drive signal output 16 SP RELAY O Front speaker on/off relay drive control signal output “L”: front speaker on 17 LINK/MATRIX O Surround speaker on/off relay drive control signal output “H”: surround speaker on 18 SO O Serial data output to the bass boost controller 19 OE — Not used. (Connect to ground.) 20 VDD — Power supply pin (+3.3 V)

Deck-A/B selection signal output to the deck-A/B select switch “L”: deck-B, “H”: deck-A Playback muting on/off control signal output to the recording/playback equalizer amplifier “H”: muting on Recording muting on/off control signal output to the recording/playback equalizer amplifier “L”: muting on

HCD-GX25/RG220

• IC310 BU2099FV (BASS BOOST CONTROLLER) (MAIN BOARD) (HCD-RG220: AEP, UK, RUSSIA MODEL)

Pin No. Pin Name I/O Pin Description

1 VSS — Ground pin 2NC—Not used. (Open) 3DATAISerial data input from the multi controller 4 CLOCK I Serial data transfer clock signal input from the system controller 5 LCK I Serial data latch pulse clock signal input from the system controller

6 to 8 NC — Not used. (Open)

9MOTOR VCC O Motor power control signal output “L”: motor power on 10 SOL A O SOL-A control signal output 11 SOL B O SOL-B control signal output 12 LINE OUT MUTE O Line out mute signal output terminal “H”: mute on Not used in this set. (Open) 13 CD MUTE O CD mute signal output terminal “H”: mute on Not used in this set. (Open)

14 to 16 CONT 1 to 3 O Bass boost control signal output “H”: bass boost Not used in this set. (Open)

17 NC — Not used. (Open) 18 SO O Serial data output Not used. (Open) 19 OE — Not used. (Connect to ground.) 20 VDD — Power supply pin (+3.3 V)

+ 56 hidden pages

SONY HCD-GX25, HCD-RG220 Service Manual

TABLE OF CONTENTS

GENERAL

DISASSEMBLY

case (top)

CD door

CD mechanism block

front panel section

tape mechanism deck

back panel section

MAIN board

base unit

SENSOR board

MOTOR (TB) board

MOTOR (LD) board

BD board

TEST MODE

ELECTRICAL ADJUSTMENTS

DIAGRAMS