Sony HCDRG-77 Service manual

HCD-GX8000/RG77

SERVICE MANUAL

Ver 1.2 2004.08

HCD-GX8000/RG77 are the amplifier, CD player, tape deck and tuner section in MHC-GX8000/RG77.

Model Name Using Similar Mechanism NEW

CD Section

TAPE Section

CD Mechanism Type

Base Unit Name BU-30BD60C Optical Pick-up Name A-MAX.3 Model Name Using Similar Mechanism NEW Tape T ransport Mechanism T ype TCM-230AWR41CS

US Model

HCD-GX8000

E Model

HCD-RG77

CDM58E-30BD60C (HCD-GX8000) CDM58ES-30BD60C (HCD-RG77)

AUDIO POWER SPECIFICATIONS (HCD-GX8000 only)

POWER OUTPUT AND TOTAL HARMONIC DISTORTION:

With 6-ohm loads, both channels driven, from 120 Hz - 10 kHz; rates 200 watts per channel minimum RMS power, with no more than 10% total harmonic distortion from 250 miliwatts to rated output.

Amplifier section

HCD-GX8000

Total harmonic distortion

HCD-RG77

The following are measured at AC 120, 220, 240V 50/60 Hz DIN power output (rated) 160 + 160 watts

Continuous RMS power output (reference)

Inputs GAME (VIDEO): 1 Vp-p, 75 ohms (phono jack) GAME (AUDIO): Voltage 250 mV, (phono jacks) impedance 47 kilohms MD/VIDEO (AUDIO) IN: voltage 450 mV/250 mV, (phono jacks) impedance 47 kilohms MIC: sensitivity 1 mV, (phone jack) impedance 10 kilohms

Outputs VIDEO OUT: max. output level 1 Vp-p, (phono jacks) unbalanced, Sync.

Less than 0.1 % (6 ohms at 1 kHz, 100 W)

(6 ohms at 1 kHz, DIN) 200 + 200 watts

(6 ohms at 1 kHz, 10% THD)

negative load impedance 75 ohms

SPECIFICATIONS

PHONES: accepts headphones of (stereo mini jack) 8 ohms or more FRONT SPEAKER: accepts impedance of 6 to

SURROUND SPEAKER: accepts impedance of

CD player section

System Compact disc and digital Laser Semiconductor laser Laser Output Max. 44.6 µW*

Frequency response 2 Hz – 20 kHz (±0.5 dB) Wave length 795 nm CD OPTICAL DIGITAL OUT (Square optical connector jack, rear panel) Wave length 660 nm Output Level –18 dBm

Tape player section

Recording system 4-track 2-channel stereo Frequency response 50 – 13,000 Hz (±3 dB),

16 ohms 24 ohms or more

audio system (λ=795nm) *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.

using Sony TYPE I cassette

COMPACT DISC DECK RECEIVER

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 Latin and North American models:

Middle Eastern models: 531 – 1,602 kHz

Other models: 531 – 1,602 kHz

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

530 – 1,710 kHz (with the interval set at 10 kHz) 531 – 1,710 kHz (with the interval set at 9 kHz)

(with the interval set at 9 kHz)

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

– Continued on next page –

9-873-542-03 Sony Corporation

2004H05-1 Audio Group C 2004.08 Published by Sony Engineering Corporation

HCD-GX8000/RG77

General

Power requirements North America and Mexican models:

Argentina model: 220 V AC, 50/60 Hz Other models: 120 V, 220 V or 230 - 240

Power consumption 240 watts Dimensions (w/h/d) Approx. 280 x 360 x 445 Mass : Approx. 11.0 kg Design and specifications are subject to change

without notice.

120 V AC, 60 Hz

V AC, 50/60 Hz Adjustable with voltage selector

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 AC leakage. Check leakage as described below.

LEAKAGE TEST

The A C leaka ge from an y e xposed 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. Follo w the manufacturers’ instructions to use these instruments.

2. A battery-operated A C 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 AC voltmeter. The “limit” indication is 0.75 V, so analog meters must have an accurate lowvoltage scale. The Simpson 250 and Sanwa SH-63Tr d are e xamples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2 V A C range are suitable. (See Fig. A)

To Exposed Metal Parts on Set

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

Flexible Circuit Board Repairing

• Keep the temperature of the 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.

1.5 k

0.15 µF

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

Ω

Earth Ground

AC voltmete (0.75 V)

CAUTION

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

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

The following caution label is located inside the unit.

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.

HCD-GX8000/RG77

Ver 1.1

1. SERVICING NOTES ................................................ 4

2. GENERAL

Location of Controls ....................................................... 5

Setting the Clock............................................................. 6

3. DISASSEMBLY

3-1. Disassembly Flow ........................................................... 7

3-2. Top Case .......................................................................... 8

3-3. Loading Panel .................................................................. 8

3-4. CD Mechanism Deck ...................................................... 9

3-5. Front Panel Section ......................................................... 9

3-6. Back Panel Section .......................................................... 10

3-7. MAIN Board ................................................................... 10

3-8. Base Unit (BU-30BD60C) .............................................. 11

3-9. DRIVER Board, MOTOR Board and

SENSOR (CD) Board ..................................................... 11

3-10. Tape Mechanism Deck (TCM-230AWR41CS).............. 12

3-11. Belt .................................................................................. 12

3-12. SW Board, HEAD (A) Board and HEAD (B) Board..... 13

4. TEST MODE.............................................................. 14

5. MECHANICAL ADJUSTMENTS....................... 18

6. ELECTRICAL ADJUSTMENTS

Deck section .................................................................... 18

CD Section ...................................................................... 21

7-25. Printed Wiring Boards

– MAIN TRANS/SUB-TRANS Boards –...................... 46

7-26. Schematic Diagram

– MAIN TRANS/SUB-TRANS Boards –...................... 47

7-27. IC Pin Function Description ........................................... 49

8. EXPLODED VIEWS

8-1. Panel Section ................................................................... 53

8-2. Front Panel Section ......................................................... 54

8-3. Chassis Section ............................................................... 55

8-4. CD Mechanism Deck Section ......................................... 56

8-5. Base Unit Section (BU-30BD60C) ................................. 57

8-6. Tape Mechanism Deck Section

(TCM-230AWR41CS) .................................................... 58

9. ELECTRICAL PARTS LIST ............................... 59

7. DIAGRAMS

7-1. Block Diagram – CD SERVO Section – ....................... 23

7-2. Block Diagram – TUNER/TAPE DECK Section – ...... 24

7-3. Block Diagram – MAIN Section – ................................ 25

7-4. Block Diagram – DISPLAY/KEY CONTROL/

POWER SUPPLY Section – ........................................... 26

7-5. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 27

7-6. Printed Wiring Board – BD Board – ............................. 28

7-7. Schematic Diagram – BD Board – ................................ 29

7-8. Printed Wiring Boards

– DRIVER/MOTOR/SENSOR (CD) Boards –.............. 30

7-9. Schematic Diagram

– DRIVER/MOTOR/SENSOR (CD) Boards –.............. 30

7-10. Printed Wiring Boards

– SW/HEAD (A)/HEAD (B) Boards – .......................... 31

7-11. Schematic Diagram – SW Board –................................ 32

7-12. Printed Wiring Board – MAIN Board – ........................ 33

7-13. Schematic Diagram – MAIN Board (1/4) – .................. 34

7-14. Schematic Diagram – MAIN Board (2/4) – .................. 35

7-15. Schematic Diagram

– MAIN (3/4)/HEAD (A)/HEAD (B) Boards – ............. 36

7-16. Schematic Diagram – MAIN Board (4/4) – .................. 37

7-17. Printed Wiring Board – GAME IN Board – .................. 38

7-18. Schematic Diagram – GAME IN Board –..................... 39

7-19. Printed Wiring Boards

– POWER/SENSOR Boards –........................................ 40

7-20. Schematic Diagram – POWER/SENSOR Boards – ..... 41

7-21. Printed Wiring Boards

– PANEL/CD OPEN/CD SWITCH Boards – ................ 42

7-22. Schematic Diagram

– PANEL/CD OPEN/CD SWITCH Boards – ................ 43

7-23. Printed Wiring Boards

– PAD SWITCH/VOL Boards –..................................... 44

7-24. Schematic Diagram – PAD SWITCH/VOL Boards –... 45

HCD-GX8000/RG77

SECTION 1

SERVICING NOTES

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 pick-up block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objectiv e lens.

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.

• MODEL IDENTIFICATION – Back Panel –

PART No.

MODEL PART No.

E, Singapore, Chilean and Peruvian models 4-237-780-1 Mexican and Argentina models 4-237-780-6 US model 4-237-780-9

[]

LOCATION OF CONTROLS

w;waw

– Front Panel –

ALPHABETICAL ORDER A - D

CD eg CD SYNC HI-DUB qf DECK A A wh DECK B A qh DIMMER 9 DIRECTION q; DISC 1~3 4 DISC SKIP EX-CHANGE 5 Disc tray 3 DISPLAY 7

E - L

EDIT q; EFFECT ON/OFF rs ENTER ra FM MODE qs

23 4

SECTION 2

GENERAL

GAME ea GAME EQ rd GAME INPUT wd GAME MIXING wl GROOVE rf IR (receptor) 2

M - Q

MD (VIDEO) es MIC wa MIC LEVEL w; MOVIE EQ ek MUSIC EQ eh OPEN/CLOSE Z 6 P FILE r; PHONES (jack) ql PLAY MODE e;

HCD-GX8000/RG77

This section is extracted from instruction manual.

R - Z

REC PAUSE/START qg REPEAT qs SPECTRUM 8 SURROUND el SURROUND SPEAKER MODE

TAPE A/B ed TUNER/BAND ef TUNER MEMORY e; VOLUME qa

BUTTON DESCRIPTIONS

@/1 1 hH ws x qd X wk > qj . wg M/+ qk m/– wf v/V/b/B ej

e; wl wk wj

qj qk

rdrs

ejeh

HCD-GX8000/RG77

– Back Panel –

2 3

1 ANTENNA terminal 2 CD DIGITAL OUT OPTICAL terminal 3 MD/VIDEO (AUDIO) IN jack 4 VIDEO OUT jack 5 FRONT/SURROUND SPEAKER terminal 6 VOLTAGE SELECTOR switch

(E and Singapore models)

Remote Control

ALPHABETICAL ORDER A - M P - Z

CD ql CLEAR 7 CLOCK/TIMER SELECT 2 CLOCK/TIMER SET 3 D.SKIP 9 ENTER qd EFFECT ON/OFF qf GAME w; MD (VIDEO) q;

ABC

X W V U

T S R

PRESET – wd PRESET + wf PRESET EQ qj P FILE qh SURROUND SPEAKER MODE

SURROUND qs SLEEP 1 TAPE A/B qa TUNER/BAND qk TUNING – wa TUNING + ws VOL +/– 8

D E

6 7

8 9

q; qa qs

BUTTON DESCRIPTIONS

@/1 4 hH wg X 5 x 6 . wd > wf m wa M ws v/V/b/B qg

Setting the clock

Turn on the system.

Press CLOCK/TIMER SET on the remote.

When you set the time for the first time, proceed to step 5.

Press V or v repeatedly to select CLOCK SET.

Press ENTER.

Press V or v repeatedly to set the hour.

Press ENTER.

Press V or v repeatedly to set the minute.

Press ENTER.

The clock starts functioning.

Tip

If you have 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.

• This set can be disassembled in the order shown below.

3-1. DISASSEMBLY FLOW

SET

3-2. TOP CASE

(Page 8)

3-3. LOADING PANEL

(Page 8)

3-4. CD MECHANISM DECK

(CDM58E-30BD60C: HCD-GX8000) (CDM58ES-30BD60C: HCD-RG77) (Page 9)

SECTION 3

DISASSEMBLY

HCD-GX8000/RG77

Ver 1.1

3-5. FRONT PANEL SECTION

(Page 9)

3-6. BACK PANEL SECTION

(Page 10)

3-7. MAIN BOARD

(Page 10)

3-10.TAPE MECHANISM DECK

(TCM-230AWR41CS) (Page 12)

3-11.BELT

(Page 12)

3-12.SW BOARD,

HEAD (A) BOARD AND HEAD (B) BOARD (Page 13)

3-8. BASE UNIT (BU-30BD60C)

(Page 11)

3-9. DRIVER BOARD,

MOTOR BOARD AND SENSOR (CD) BOARD (Page 11)

HCD-GX8000/RG77

)

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

3-2. TOP CASE

two screws (case 3 TP2)

side panel (L)

top

case

(BVTP 3

two screws

10)

two screws

(BVTP 3

10)

side panel (R)

two screws

(BVTP 3

12)

screw (case 3TP2)

3-3. LOADING PANEL

loading panel

four claws

two

screws

(BVTP 3

three screws (case 3 TP2

10)

Pull-out the disc table.

–BOTTOM VIEW– CD mechanism deck (CDM58E-30BD60C)

Turn the pulley in the direction of the arrow.

Front panel side

HCD-GX8000/RG77

)

Ver 1.1

3-4. CD MECHANISM DECK (CDM58E-30BD60C: HCD-GX8000), (CDM58ES-30BD60C: HCD-RG77)

CD mechanism deck

wire (flat type)

screw (BVTP 3

(21 core)

× 10)

(CN201

connector (

CN202)

3-5. FRONT PANEL SECTION

connector

CN401)

(

connector

CN781)

(

wire (flat type) (17 core)

(CN304)

connector

CN783)

(

screw (BVTP 3

× 10)

four

(BVTP 3

screws

× 10

connector (

front panel section

)

CN1)

CN2)

HCD-GX8000/RG77

)

3-6. BACK PANEL SECTION

connector (CN973)

wire

(flat type) (11core)

(CN702)

connector

screw

(BVTP 3

(CN974)

connector

sensor board

10)

(CN976)

(CN701)

back panel section

two

screws

(BVTP 3

three

(BVTP 3

10)

screws

four

10)

screws

3-7. MAIN BOARD

two

claws

connector

claw

(CN891)

main board

two

(CN502, CN503

two screws (BVTP 3

main board

connectors

10)

)

3-8. BASE UNIT (BU-30BD60C)

two insulators (BU-30)

holder (BU) (BU-30) assy

base unit (BU-30BD60C)

HCD-GX8000/RG77

screw (PTPWH M2.6)

two insulators (BU-30)

screws (DIA. 12)

two stoppers (BU)

two screws (BVTP 2.6

BD board

rivet

3-9. DRIVER BOARD, MOTOR BOARD AND SENSOR (CD) BOARD

wire (flat type) (8 core)

tray

(CN702)

screw (PTPWH 2.6

screw (BVTP 2.6

motor board

two screws (BVTP 2.6

wire (flat type) (8 core)

Remove the two solderings of motor.

(CN721)

connector

sensor (CD)

two

screws (PTPWH M2.6

wire (flat type) (16 core)

wire (flat type) (21 core)

(CN722)

(CN102)

(CN101)

board

driver board

crew (BVTP 2.6

Pull out the disc table.

HCD-GX8000/RG77

)

3-10. TAPE MECHANISM DECK (TCM-230AWR41CS)

tape mechanism deck

(TCM-230AWR41CS)

five

screws

(BVTP 2.6

two

screws

(BVTP 2.6

3-11. BELT

knob (mic)

belt

(FR)

two

(P 2.6

belt

screws

(capstan B)

two

screws

(BVTP 2.6

belt

(capstan C)

shield plate (TC

game in board

motor assy

(M901)

belt

(capstan B)

(capstan

two

screws

(PS 2.6

belt

(FR)

3-12. SW BOARD, HEAD (A) BOARD AND HEAD (B) BOARD

five claws

HCD-GX8000/RG77

SW board

Remove the four solders.

head (A) board

screw (PTT 2

head (B) board

screw (PTT 2

HCD-GX8000/RG77

SECTION 4

TEST MODE

[GC TEST MODE]

• This mode is used to check the fluorescent indicator tube, LED, model, destination software version, volume, key and VACS level.

Procedure:

1. Press three buttons x , [ENTER], and [DISC 2] simultaneously .

2. LEDs and fluorescent indicator tube are all turned on.

3. When you want to enter the software version display mode,

press [DISC 1]. The model and destination are displayed.

4. Each time [DISC 1] is pressed, the display changes starting

from MC version, GC version, CD version, CDDM version, CDMA version, CDMB version, BDA version, BDB version, ST version, T A version, TM version and TC version in this order , and returns to the MC version display.

5. When [DISC 3] is pressed while the version numbers are being

displayed except model and destination, year, month and day of the software creation appear. When [DISC 3] is pressed again, the display returns to the software version display . When [DISC 1] is pressed while year, month and day of the software creation are being displayed, the year, month and day of creation of the software versions are displayed in the same order of version display .

6. Press [DISC 2] button, and the key check mode is activated.

7. In the key check mode, the fluorescent indicator tube displays

“K0 V0”. Each time a button is pressed, “K” value increases. However, once a button is pressed, it is no longer taken into account. “V” value increases like 1, 2, 3 ... if rotating [VOLUME] knob in “+” direction, or it decreases like 0, 9, 8 ... if rotating in “–” direction.

8. Also when [DISC 3] is pressed after lighting of all LEDs and

fluorescent indicator tubes, value of VACS level appears.

9. T o release this mode, press three buttons in the same manner as

step 1, or disconnect the power cord.

[MC TEST MODE]

• This mode is used to check operations of the respective sections of Amplifier, Tuner , and Tape.

Procedure:

* To enter MC Test Mode

1. Press three buttons of x , [ENTER] and [DISC 3] simultaneously.

2. The messages MUSIC, MOVIE, GAME and P FILE flash on

the fluorescent indicator tube. The input FUNCTION is changed to VIDEO.

* Tape function

1. When a tape is inserted in tape deck B and recording is started, the input source function selects VIDEO automatically.

[CD SYNC HI-DUB] button is pressed during recording

When in function, ALC is turned on.

2. When x button is pressed to stop recording, the tape deck B is selected and tape is rewound, tape is rew ound using – m button, tape is stops at around the record-starting position and playback of the recorded portion of the tape is started. If the [REC PAUSE/

START] button is pressed for a pause and pressed again to resume

recording, when tape deck B is rewound, tape deck B will be rewound until the position where the pause is applied.

3. When [CD SYNC HI-DUB] button is pressed during playback of tape deck B, either normal speed or high speed can be selected by this button.

* AMS Test Mode

1. Select the function “T APE A” or “TAPE B”.

2. Select the loop and relay by pressing the [DIRECTION] button. Insert a test tape AMS-110A or AMS-120 to selected tape deck.

3. Press the [SPECTRUM] button to enter the AMS test mode.

4. After a tape is rewound first, the FF AMS is checked, and the mechanism is shut off after detecting the AMS signal twice.

5. Then the REW AMS is checked and the mechanism is shut off after detecting the AMS signal twice.

6. When the check is complete, a message of either OK or NG appears.

* To release MC Test mode.

1. To release this mode , press the ?/1 button.

2. The cold reset is enforced at the same time.

[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 , [ENTER], and ?/1 simultaneously.

2. The fluorescent indicator tube becomes blank instantaneously, and the set is reset.

[VACS ON/OFF MODE]

• This mode is used to switch ON and OFF the VACS (Variable

Attenuation Control System).

* Check of Amplifier

1. When v button is pressed, GEQ increases to its maximum and a message “GEQ MAX” appears.

2. When V button is pressed, GEQ decreases to its minimum and a message “GEQ MIN” appears.

3. When b or B button is pressed, GEQ is set to flat and a message “GEQ FLAT” appears.

4. When the [VOLUME] knob is turned clockwise even slightly, the sound volume increases to its maximum and a message “VOLUME MAX” appears for two seconds, then the display returns to the original display.

5. When the [VOLUME] knob is turned counter-clockwise even slightly, the sound volume decreases to its minimum and a message “VOLUME MIN” appears for two seconds, then the display returns to the original display.

* Check of clock frequency

1. T o check the frequency of clock used to run the time in the unit, the clock output is available at IC501 pin el (CLOCK-OUT) on the MAIN board only during MC test mode.

2. The frequency is 32.768 kHz or so.

Procedure:

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

2. Press the [ENTER] and [GAME MIXING] buttons simultaneously . The message “VACS OFF” or “VACS ON” appears.

[TUNER STEP CHANGE]

• A step of AM channels can be changed over 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 [ENTER] and ?/1 buttons simultaneously, and the display of fluorescent indicator tube changes to “AM 9k STEP” or “AM 10k STEP”, and thus the channel step is changed over .

HCD-GX8000/RG77

[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 ?/1 button to turn the set ON.

2. Select the function “CD”.

3. Press three buttons x , [ENTER] , and [OPEN/CLOSE] si-

multaneously.

4. The CD service mode is selected.

5. With the CD in stop status, press M + button to move the

optical pick-up to outside track, or press – m button to inside track.

6. To release this mode , press the ?/1 button.

[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 ?/1 button to turn the power ON, and press the [CD]

button to select the function “CD”.

2. Set discs on all trays, and set tapes into the decks A and B

respectively.

3. Press the [PLAY MODE] b utton to set the “ALL DISCS” mode,

and press the [REPEAT] button to “REPEAT” off.

4. Press three buttons of x , [ENTER], and [EX-CHANGE/DISC

SKIP] simultaneously.

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

6. To release this mode, press the

power code to turn the power OFF.

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.

?/1 button or disconnect the

Aging mode sequence (CD section) :

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.

• Display at an error occurred (Error display mode)

Procedure:

1. Press three buttons of

x , [ENTER], and [DISC 1] simultaneously

to enter the error display mode.

2. It displays of total error.

3. Each time the – m or M + button is pressed, display change as below.

4. To clear the error record, operate the cold reset. (Refer to the “MC COLD RESET”)

5. To release this mode, press the ?/1 button or disconnect the power plug to turn the power OFF.

Display of total error

– m

Button

M +

Button

Display of Mechanical errors

– m

Button

Display of no disc errors

M +

Button

HCD-GX8000/RG77

1) Display of total error

Display

EMC**EDC**

EMC**: The number of mechanical error. EDC**: The number of no disc error after chucking the disc.

2) Display of mechanical errors

Display

M*$$%%&&##00

M*: The number of mechanical error (“00” is latest one)

(Press the . or > button to changes next error display)

$$: Not used %%: Loading error (Second figure is not used)

D: The error in the midst of close at the except mechanical

trouble.

E: The error in the midst of open at the except mechanical

trouble.

C: The error in the midst of chucking up at the except

mechanical trouble.

F: The error in the midst of chucking down at the except

mechanical trouble.

&&: Loading error

01: The error in the midst of chucking up. 02: The error in the midst of chucking down. 03: Time-out of EX-open. 05: Time-out of EX-close.

##: Not used

3) Display of no disc errors

Display

D*$$%%&&##00

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

“TAPE A AG-1”

Shut off

FWD play the tape A

“TAPE A AG-2”

2 minutes

Fast forward the tape A

“TAPE A AG-3”

Shut off or 20 seconds

REV play the tape A

“TAPE A AG-4”

2 minutes

Rewind the tape A

“TAPE A AG-5”

Shut off

FWD play the tape B

“TAPE B AG-2”

2 minutes

Fast forward the tape B

“TAPE B AG-3”

Shut off or 20 seconds

REV play the tape B

“TAPE B AG-4”

2 minutes

D*: The number of mechanical error(“00” is latest one)

(Press the

. or > button to changes next error display)

$$: Error type

01: Focus error 02: GFS error 03: Set up error

%%: Not used &&:

00: No disc judgment without chucking retry. 01: No disc judgment after chucking retry.

##: The state when judged no disc error

01: Stop 02: Set up 03: TOC read 04: Access 05: Play 06: Pause 07: Manual search (Play) 08: Manual search (Pause)

Rewind the tape B

“TAPE B AG-5”

Shut off

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

[CD REPEAT 5 LIMIT OFF MODE]

Number of repeat for CD playback is 5 times when the repeat mode is “REPEA T”. This mode enables CD to repeat playback for limitless times.

Procedure:

1. Press the ?/1 button to turn the power on, and press the [CD] button to select the function “CD”.

2. Press three buttons of x , [REPEAT], and [CD] simultaneously to enter the CD repeat 5 limit off mode and display “REPEAT OFF”.

3. To release this mode, operate the cold reset. (Refer to the “MC COLD RESET”)

[CD SHIP MODE (MEMORY CLEAR) ]

• 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. Set to the standby state.

2. Press three buttons x , [ENTER] and [GAME] simultaneously .

3. After the “STANDBY” display blinks, a message “LOCK” is

displayed on the fluorescent indicator tube, and the CD ship mode is set.

[CD SHIP MODE (NO MEMORY CLEAR) ]

• 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. Set to the standby state.

2. Press the [CD] and ?/1 buttons simultaneously.

3. After the “STANDBY” display blinks, a message “LOCK” is

displayed on the fluorescent indicator tube, and the CD ship mode is set.

HCD-GX8000/RG77

SECTION 5

MECHANICAL ADJUSTMENTS

SECTION 6

ELECTRICAL ADJUSTMENTS

Precaution

1. Clean the following parts with a denatured alcohol-moistened swab:

record/playback heads 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

Mode Torque meter

FWD

FWD back tension

REV

REV back tension

FF/REW

FWD tension

REV tension

CQ-102C

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

Meter reading

3.06 N • m to 6.96 N • m 31 to 71 g • cm

(0.43 – 0.98 oz • inch)

0.19 N • m to 0.58 N • m

2 to 6 g • cm

(0.02 – 0.08 oz • inch)

3.06 N • m to 6.96 N • m 31 to 71 g • cm

(0.43 – 0.98 oz • inch)

0.19 N • m to 0.58 N • m

2 to 6 g • cm

(0.02 – 0.08 oz • inch)

6.96 N • m to 14.02 N • m 71 to 143 g • cm

(0.98 – 1.99 oz • inch)

9.80 N • m

100 g or more

(3.53 oz or more)

9.80 N • m

100 g or more

(3.53 oz or more)

DECK SECTION

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 adjust.

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.

7. Switches and controls should be set as follows unless otherwise specified.

• Test Tape

Tape Signal Used for

P-4-A100 10 kHz, –10 dB Azimuth Adjustment

WS-48B 3 kHz, 0 dB Tape Speed Adjustment

0 dB=0.775 V

RECORD/PLA YBA CK HEAD AZIMUTH ADJUSTMENT

DECK A DECK B

Note: Perform this adjustments for both decks

Procedure:

1. Mode: Playback

test tape P-4-A100 (10 kHz, –10 dB)

set

MAIN board CN301 Pin

(L-CH)

(R-CH)

MAIN board CN301

(GND)

level meter

–

HCD-GX8000/RG77

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 1dB of peak.

Output level

within 1dB

L-CH peak

R-CH peak

within 1dB

Screw position

L-CH peak

Screw position

R-CH peak

3. Mode: Playback

test tape P-4-A100 (10 kHz, –10 dB)

L-CH

MAIN board CN301 set

R-CH

waveform of oscilloscope

in phase 45°90°135°180

good

oscilloscop

wrong

TAPE SPEED ADJUSTMENT DECK B

Note: Start the Tape Speed adjustment as below after setting to the test

mode. In the test mode, the tape speed is high during pressing the

[CD SYNC HI-DUB] button.

Procedure:

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

2. Press three buttons x , [ENTER] and [DISC 3] simultaneously . To release from the test mode, press the ?/1 button.

Mode: Playback

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

1. Insert the WS-48B into the deck B.

2. Press the hH button on the deck B.

3. Press the [CD SYNC HI-DUB] button in playback mode. Then at HIGH speed mode.

4. Adjust RV1001 on the SW board so that frequency counter r eads 6,000 ± 180 Hz.

5. Press the [CD SYNC HI-DUB] button. Then back to NORMAL speed mode.

6. Adjust RV1002 on the SW board so that frequency counter r eads 3,000 ± 90 Hz.

Adjustment Location: SW board

Sample Value of Wow and Flutter: 0.3% or less W. RMS (JIS)

MAIN board CN301 Pin Pin

set

MAIN board CN301 Pin

(L-CH)

(R-CH)

frequency counter

–

(GND)

(WS-48B)

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

Adjustment Location: Playback Head (Deck A).

Record/Playback/Erase Head (Deck B).

forward

reverse

HCD-GX8000/RG77

REC BIAS ADJUSTMENT DECK B

Procedure:

In the MC test mode, the “REC memory mode” is convenient for this adjustment. In the “REC memory mode” , when the REC starts the input signal FUNCTION is switched to VIDEO automatically. When the REC stops, the tape returns near to the recording start position.

1. Press MD (VIDEO) button to select VIDEO. (This step is not necessary if the above test mode has already been set)

2. Insert a tape into deck B.

3. After press [REC PAUSE/START] button, press [REC PAUSE/

START] button, then recording start.

4. Mode: Record

MAIN board MD/VIDEO (AUDIO) IN (J750)

1) 315 Hz

2) 10 kHz

AF OSC

attenuator

5. Mode: Playback

recorded portion

  

600

MAIN board CN301

set

MAIN board CN301 Pin

50 mV (–23.8 dB)

Ω

set

(GND)

level meter

–

(L-CH) (R-CH)

blank tape CN-123

4. Mode: Record

MAIN board MD/VIDEO (AUDIO) IN (J750)

AF OSC

315 Hz, 50 mV (–23.8 dB)

Ω

attenuator

600

blank tape CS-123

set

5. Mode: Playback

MAIN board

recorded portion

CN301

set

MAIN board CN301 Pin

(L-CH) (R-CH)

level meter

–

(GND)

6. Confirm the play back signal recorded in step 3 becomes adjustable level as follows. If these levels are not adjustable level, adjust the RV301 (LCH) and RV351 (R-CH) on the MAIN board to repeat steps 4 and 5.

Adjustable level:

CN301 PB level: 47.2 to 53.0 mV (–24.3 to –23.3 dB) Adjustment Location: MAIN board

– SW BOARD (Component Side) –

TAPE SPEED

ADJUSTMENT



(NORMAL) (HIGH)



6. Confirm the playback signal recorded in step 3 becomes adjustable level as follows. If these levels are not adjustable level, adjust the RV304 (LCH) and R V354 (R-CH) on the MAIN board to repeat steps 4 and 5.

Adjustable level: Playback output of 315 Hz to playback output

of 10 kHz: ±1.0 dB

Adjustment Location: MAIN board

REC LEVEL ADJUSTMENT DECK B

Procedure:

1. Press MD (VIDEO) button to select VIDEO. (This step is not necessary if the above test mode has already been set)

2. Insert a tape into deck B.

3. After press [REC PAUSE/START] button, press [REC PAUSE/

START] button, then recording start.

RV1002

– MAIN BOARD (Component Side) –

RV1001

REC BIAS ADJUSTMENT

CN1001

REC LEVEL

ADJUSTMENT



CN301

(R-CH)

RV351

RV304 RV354

(L-CH)







(L-CH)

RV301

(R-CH)









HCD-GX8000/RG77

)

CD SECTION

Note:

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

2. Use LUV-P01 (4-999-032-01) 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.

S-CURVE CHECK

Oscilloscope

BD board

TP(FEO) TP(DVC)

Procedure :

1. Connect an oscilloscope to TP (FEO).

2. Connect between TP (FEI) and TP (DVC) ( 1.65 V) by lead wire.

3. Turn the power ON.

4. Load a disc (LUV-P01) and actuate the focus search. (In consequence of open and close the disc tray, actuate the focus search)

5. Confirm that the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 2 ± 0.5 Vp-p.

S-curve waveform

symmetry

within 2

0.5Vp-

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 : 0.65

0.15Vp-p (RFDC)

1.1

0.4Vp-p (RFAC)

E-F BALANCE (1 TRACK JUMP) ADJUSTMENT

oscilloscop

BD board

TP(TEO) TP(DVC)

Procedure :

1. Connect an oscilloscope to TP (TEO) and TP (DVC).

2. Turn the power ON.

3. Load a disc (LUV-P01) and playback the number nine track.

4. Press the hH button. (Becomes the 1 track jump mode.)

5. Confirm that the level B and A (DC voltage) on the oscilloscope waveform.

1 track jump waveform

DVC

level=1.0 ±0.5Vp-p

symmetry

center of waveform

A (DC voltage

6. After check, remove the lead wire connected in step 2.

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(RFDC) TP(RFAC)

TP(DVC)

Procedure :

1. Connect an oscilloscope CH1 to TP (RFDC) and CH2 to TP (RFAC).

2. Turn the power ON.

3. Load a disc (LUV-P01) and playback.

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

oscilloscope

6. Adjust RV101 on the BD board so tha t the center of waveform becomes the same voltage of DVC. (i.e. A=0V)

Connecting and Adjustment Location: BD board

HCD-GX8000/RG77

Connecting and Adjustment Location:

– BD BOARD (Component Side) –

(DVC)

(FEO)

(RFAC)

(FEI)

(RFDC)

(TEO)

– BD BOARD (Conductor Side) –

RV101

E-F BALANCE

(1 TRACK JUMP)

ADJUSTMENT

+ 50 hidden pages

Sony HCDRG-77 Service manual

TABLE OF CONTENTS

SERVICING NOTES

GENERAL

3-1. DISASSEMBLY FLOW

DISASSEMBLY

3-2. TOP CASE

loading panel

3-4. CD MECHANISM DECK (CDM58E-30BD60C: HCD-GX8000), (CDM58ES-30BD60C: HCD-RG77)

front panel section

back panel section

main board

base unit (BU-30BD60C)

3-9. DRIVER BOARD, MOTOR BOARD AND SENSOR (CD) BOARD

belt

TEST MODE

MECHANICAL ADJUSTMENTS

ELECTRICAL ADJUSTMENTS

DECK SECTION

CD SECTION