Sony HCDGS-300-AV Service manual

HCD-GS300AV

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 OPTICAL OUT (CD) (Square optical connector jack, rear panel) Wavelength 660 nm Output Level –18 dBm

Tape player section

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

using Sony TYPE I

cassette

Amplifier section U.S.A. models:

AUDIO POWER SPECIFICATIONS

POWER OUTPUT AND TOTAL HARMONIC DISTORTION:

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

Front speaker:

Continuous RMS power output

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

Total harmonic distortion less than 0.09%

(6 ohms at 1 kHz, 35 watts)

Center speaker:

Continuous RMS power output

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

Rear speaker:

Continuous RMS power output

25 + 25 watts (6 ohms at 1 kHz,

10% THD) Inputs VIDEO (MD) IN (phono jacks):

voltage 250 mV/450 mV,

impedance 47 kilohms GAME (AUDIO) IN (phono jack):

voltage 450 mV,

impedance 47 kilohms AUDIO IN (phono jacks): 450mV 47 kilohms

5.1CH INPUT FRONT (phono jacks): voltage 450 mV,

impedance 47 kilohms REAR (phono jacks): voltage 450 mV,

impedance 47 kilohms CENTER (phono jack): voltage 450 mV,

impedance 47 kilohms SUB WOOFER (phono jack):

voltage 450 mV,

impedance 47 kilohms

Outputs PHONES (stereo phono jack):

accepts headphones of

8 ohms or more FRONT SPEAKER: accepts impedance of 6 to

16 ohms

SURROUND SPEAKER REAR:

accepts impedance of 6 to 16 ohms

SURROUND SPEAKER CENTER:

accepts impedance of 6 ohms

SUB WOOFER:

voltage 1 V, impedance 1 kilohm

SUB WOOFER (phono jack):

voltage 450 mV,

impedance 47 kilohms

SERVICE MANUAL

Ver. 1.4 2004.12

HCD-GS300AV is the Amplifier , CD pla yer , Tape Deck and Tuner section in MHC-GS300AV.

Manufactured under license from Dolby Laboratories. “Dolby”, “Pro Logic”, and the double-D symbol are trademarks of Dolby Laboratories.

CD Section

TAPE Section

US Model

Canadian Model

Australian Model

Model Name Using Similar Mechanism NEW CD Mechanism Type CDM64B-K1BD47A Base Unit Name BU-K1BD47A Optical Pick-up Name KSM-213BFN Model Name Using Similar Mechanism NEW Tape Transport Mechanism T ype CMAL1Z221

9-873-999-05

Sony Corporation

Audio Group Published by Sony Engineering Corporation

SPECIFICATIONS

COMPACT DISC DECK RECEIVER

— Continued on next page —

HCD-GS300AV

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range 87.5 – 108.0 MHz Antenna FM lead antenna Antenna terminals North American model: 75 ohms unbalanced Australian model: 75 ohms balanced Intermediate frequency 10.7 MHz

AM tuner section

Tuning range North American model: 530 – 1,710 kHz

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

Other model: 531 – 1,602 kHz

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

General

Power requirements North American model: 120 V AC, 60 Hz Australian model: 220 – 240 V AC,

Power consumption: 180 watts

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

2. GENERAL ··········································································5

3. DISASSEMBLY ································································ 7

3-1. Cabinet T op ··································································· 8 3-2. Front Cabi Assy·····························································8 3-3. Back Panel Assy ···························································· 9 3-4. MAIN Board, PROLOGIC Board·································9 3-5. AMP Board ································································· 10 3-6. POWER Board ···························································· 10 3-7. Holder (LED-S), Bracket (Middle-R),

Power Bracket ····························································· 11 3-8. CD Mechanism Deck (CDM64B-K1BD47A) ············ 11 3-9. Base Unit (BU-K1BD47A),

D.SENSOR (OUT) Board, T.SENSOR Board············12 3-10.D.SENSOR (IN) Board, LOAD SW Board,

L.T MOTOR Board ·····················································12 3-11.CD LED Board ···························································· 13 3-12.BU Holder Assy··························································· 13 3-13.CD Board, Optical Pick-up (KSM-213BFN) ·············· 14 3-14.Cassette Holder, Mech Deck (CMAL1Z221) ············· 14 3-15.Belt ·············································································· 15 3-16.DISPLAY Board·························································· 15 3-17.KEY Board ·································································· 16 3-18.HEADPHONE Board ·················································· 16 3-19.DOOR LED Board ······················································ 17

4. TEST MODE····································································18

5. MECHANICAL ADJUSTMENTS ····························· 19

6. ELECTRICAL ADJUSTMENTS······························19

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

50/60 Hz

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

Mass: Approx. 9.1 kg Supplied accessories: Remote commander (1)

Design and specifications are subject to change without notice.

Approx. 280 × 325 × 465 mm

Batteries (2) AM loop antenna (1) FM lead antenna (1) Rear speaker cords (2) Center speaker pads (attached to the backside of the center speaker) (2)

7. DIAGRAMS

7-1. Circuit Boards Location ·············································· 23 7-2. Block Diagrams ··························································· 24

– CD Section – ···························································· 24 – TUNER/TAPE DECK Section – ······························ 25 – SURROUND Section – ············································ 26 – AMP Section – ························································· 27

– DISPLAY/POWER Supply Section – ······················ 28 7-3. Printed Wiring Board – CD Section – ························ 29 7-4. Schematic Diagram – CD Section – ··························· 30 7-5. Printed Wiring Board

– CD MOTOR/SENSOR Section –····························· 31 7-6. Schematic Diagram

– CD MOTOR/SENSOR Section –····························· 32 7-7. Printed Wiring Board – MAIN Section – ···················33 7-8. Schematic Diagram – MAIN Section (1/3) – ············· 34 7-9. Schematic Diagram – MAIN Section (2/3) – ············· 35 7-10.Schematic Diagram – MAIN Section (3/3) – ············· 36 7-11.Printed Wiring Board – AMP Section – ····················· 37 7-12.Schematic Diagram – AMP Section – ························38 7-13.Printed Wiring Board – SURROUND Section –········39 7-14.Schematic Diagram – SURROUND Section – ·········· 40 7-15.Printed Wiring Board – DISPLAY Section – ············· 41 7-16.Schematic Diagram – DISPLAY Section –················ 42 7-17.Printed Wiring Board – POWER Section –················43 7-18.Schematic Diagram – POWER Section – ·················· 44 7-19.IC Block Diagrams ······················································ 45 7-20.IC Pin Function Description ········································ 48

8. EXPLODED VIEWS

8-1. General Section ··························································· 53 8-2. Front Panel Section ····················································· 54 8-3. Chassis Section ···························································· 55 8-4. Mechanism Deck Section-1 (CDM64B-K1BD47A) ·· 56 8-5. Mechanism Deck Section-2 (CDM64B-K1BD47A) ·· 57 8-6. Base Unit Section (BU-K1BD47A) ···························· 58

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

HCD-GS300AV

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 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.

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 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 voltmeter . The “limit” indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM tha t 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

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.

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

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 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.

1.5 k

0.15 µF

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

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 .

Ω

Earth Ground

voltmete (0.75 V)

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-GS300AV

SECTION 1

SERVICING NOTES

CD-TEXT TEST DISC

This unit is able to display the test data (character information) written in the CD on its fluorescent indicator tube. The CD-TEXT TEST DISC (TGCS-313: J-2501-126-A) is used for checking the display. To check, perform the following procedure.

Checking Method:

1. Press the I/1 button to turn the power on, set the disc to the disc table with the “test disc” label facing right, and chuck the disc.

2. Press the [CD] button to set CD function, and press the bB button to playback the disc.

3. The following will be displayed on the liquid crystal display.

Display : 1KHZ/0dB/L R

4. Pressing the [-- ] or [ +] button, select the track. The te xt data of each track will be displayed. For details of the displayed contents for each track, refer to “T able 1: CD-TEXT TEST DISC TEXT Data Contents”.

Restrictions in CD-TEXT Display

In this unit, some special characters will not be displayed properly . These will be displayed as a space or a character resembling it.

Table 1: CD-TEXT TEST DISC TEXT Data Contents

(TRACKS No. 1 to 20: Normal Characters)

CLEANING OBJECTIVE LENS OF OPTICAL PICK-UP

• In cleaning the objective lens of optical pick-up, be sure the following below.

Remove the magnet assy.

optical pick-up

bracket (top 60) hole

Put a cotton bud into the hole on the bracket (top 60) and clean the OP lens.

Note 1. In cleaning the lens, do not apply an excessive force.

As the optical pick-up is vulnerable, application of excessive force could damage the lens holder.

Note 2. In cleaning, do not use a cleaner other than exclusive cleaning

liquid (KK-91 or isopropyl alcohol).

Note 3. Wipe the objective lens spirally from center toward outside. (See

Figure A)

Open the torsion holder (magnet) in direction of arrow

TRACK

No.

1 1kHz/0dB/L&R 2 20Hz/0dB/L&R 3 40Hz/0dB/L&R 4 100Hz/0dB/L&R 5 200Hz/0dB/L&R 6 500Hz/0dB/L&R 7 1kHz/0dB/L&R 8 5kHz/0dB/L&R

9 7kHz/0dB/L&R 10 10kHz/0dB/L&R 11 16kHz/0dB/L&R 12 18kHz/0dB/L&R 13 20kHz/0dB/L&R 14 1kHz/0dB/L&R 15 1kHz/–1dB/L&R 16 1kHz/–3dB/L&R 17 1kHz/–6dB/L&R 18 1kHz/–10dB/L&R 19 1kHz/–20dB/L&R 20 1kHz/–60dB/L&R

Displayed Contents

(Figure A)

Note: Track No. 21 to 99 are not displayed.

Main unit

SECTION 2

GENERAL

HCD-GS300AV

This section is extracted from instruction manual.

ALPHABETICAL ORDER

A – O

5.1CH/VIDEO (MD) wg (35 – 37) ALBM +/– 4 (19) AUDIO IN L/R jacks qk (34) CD wk (14 – 17, 19, 24) CD SYNC 0 (24, 25) CLEAR wa (16, 22, 39) DISC SELECT qf

(13 – 17, 19, 24) DISPLAY e; (22, 29, 30, 39) Display window 2 DOLBY PRO LOGIC 6 (12, 28) ENTER ws (15 – 17, 20 – 22, 25,

26, 32) GAME wf (30) GAME MIXING w; (31) KEYBOARD INPUT jack qh

(33) MENU wl (16, 17, 20 – 22) MULTI ROOM 9 (28)

e; wl wk wj wh wg wf wd ws wa w; ql qk

P – Z

PAUSE X 5 (15, 23 – 25) PHONES jack qg PLAY MODE/DIRECTION wd

(14 – 17, 23 – 25) PRESET +/– 4 (20 – 22) PRESET EQ 8 (27) REC z PAUSE/START

(24, 25) REPEAT/FM MODE (15, 22) STOP x qa (15, 23, 24, 35, 39) SURROUND MODE 7 (27) TAPE wh (23) Tape deck 3 TIMER SELECT wd (26, 32, 37) TIMER SET wd (12, 25, 32) TUNER/BAND wj (20 – 22) TUNING +/– 4 (20 – 22) VIDEO IN jack ql (34) VOLUME qj

2 345

BUTTON DESCRIPTIONS

'/1 (power) 1 m (rewind) 4 n N (play) 4 M (fast forward) 4 . (go back) 4 > (go forward) 4 Z PUSH (front cover) qd Z PUSH (tape deck) 3

6 7 8

9 q; qa qs qd

qf qg qh

HCD-GS300AV

Remote Control

ALPHABETICAL ORDER

A – O

5.1CH wg (36) ALBM +/ALBM – qa qk (19) BALANCE LEFT/RIGHT 2

(12) CD wd (14 – 17, 19, 24) CENTER +/– 4 (12) DISC +/DISC – qs qj

(13 – 16, 19) DISPLAY 8 (22, 29, 30) GAME 6 (30) GROOVE qf (26)

P – Z

PRESET EQ qd (27) PRESET +/PRESET – q; w;

(20 – 22) PRO LOGIC wj (12, 28) REAR +/– 5 (12) SLEEP 1 (31) SURROUND qh (27) TAPE 7 (23) TEST TONE wf (12) TUNER/BAND ws (20 – 22) TUNING +/TUNING – 9 ql

(20 – 22) VIDEO (MD) wh (35, 37) VOL +/– qg

123

wj wh wg wf wd ws wa w; ql

qk qj

BUTTON DESCRIPTIONS

\/1 (power) 3 n N (play) wa X (pause) wa x (stop) wa . (go back) w; m (rewind) ql M (fast forward) 9 > (go forward) q;

6 7

8 9 q;

qa qs

Setting the clock

1 Press '/1 to turn on the system. 2Press TIMER SET. 3Press . or > repeatedly to set the

hour.

4Press ENTER. 5Press . or > repeatedly to set the

minute.

6Press ENTER.

To adjust the clock

1 Press TIMER SET. 2 Press . or > repeatedly to select

“CLOCK SET”, then press ENTER.

3 Do the same procedures as step 3 to 6

above.

Notes

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

• You cannot set the clock in Power Saving Mode.

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

SET

CABINET TOP

HCD-GS300AV

SECTION 3

DISASSEMBLY

FRONT CABI ASSY

BACK PANEL ASSY

MAIN BOARD, PROLOGIC BOARD

AMP BOARD

POWER BOARD

HOLDER (LED-S),

BRACKET (MIDDLE-R),

POWER BRACKET

CD MECHANISM DECK

(CDM64B-K1BD47A)

BASE UNIT (BU-K1BD47A), D.SENSOR (OUT) BOARD,

T.SENSOR BOARD

CASSETTE HOLDER,

MECH

DECK (CMAL1Z221)

BELT

DISPLAY

CD LED BOARD

BU HOLDER ASSY

KEY

BOARD

HEADPHONE BOARD,

GAME LINK BOARD

DOOR LED BOARD

D.SENSOR (IN) BOARD,

LOAD SW BOARD,

L.T MOTOR BOARD

CD BOARD

HCD-GS300AV

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

3-1. Cabinet T op

cabinet top

two screws (BVTP3 × 8)

panel side (L)

three screws (BVTP3 × 8)

wire (flat type) (8 core) (CN309 )

3-2. Front Cabi Assy

connector 8p (CN441)

connector 2p (CN705)

connector 4p (CN503)

panel side (R)

two screws (BVTP3 × 8)

three screw (BVTP3 × 8)

front cabi assy

screw (KTP3 × 8)

connector 8p (CN310)

wire (flat type) (19 core) (CN303 )

three screws (BVTP3

screw (KTP3 × 8)

3-3. Back Panel Assy

)

connector 2p (CN601)

back panel assy

dc fan (M391)

two screws (BVTP3

10)

HCD-GS300AV

four screws (BVTP3

four screws

(BVTP3

screw (BVTP3 × 10

screw (BVTP3 × 10)

10)

four screws (BVTP3

five screws (BVTP3

two screws (BVTP3

10)

3-4. MAIN Board, PROLOGIC Board

wire (flat type) (17 core) (CN311)

wire (flat type) (29 core) (CN305)

connector 9p (CN307)

connector 7p (CN308)

PROLOGIC board

MAIN boar

connector 8p (CN301)

screw (BVTP3 × 8)

HCD-GS300AV

3-5. AMP Board

screw (BVTP3 × 8)

connector 6p (CN502)

two screws (BVTP3

AMP boar

3-6. POWER Board

power, cord

POWER board

two screws

two screws (BVTP4 × 8)

(BVTP4 × 8)

3-7. Holder (LED-S), Bracket (Middle-R), Power Bracket

holder (LED-S)

screw (BVTP3 × 8)

three screws (BVTP3 × 8)

bracket (middle-R)

two screws (BVTP3 × 8)

screw (BVTP3 × 8)

power bracket

three screws (BVTP3 × 8)

)

HCD-GS300AV

3-8. CD Mechanism Deck (CDM64B-K1BD47A)

screw (M3 × 12)

table (60)

lower chassis

CD mechanism deck (CDM64B-K1BD47A)

screw (PSW3

two screws (BVTP3

four screws (BVTP3

four screws

(BVTP3

HCD-GS300AV

3-9. Base Unit (BU-K1BD47A), D.SENSOR (OUT) Board, T.SENSOR Board

screw (BVTP3 × 8)

D.SENSOR (OUT) board

bracket (top 60)

three screws (BVTP3

base unit (BU-K1BD47A)

three screws (BVTP3

T.SENSOR board

3-10. D.SENSOR (IN) Board, LOAD SW Board, L.T MOTOR Board

belt

two screws (BVTP3

D.SENSOR (IN) board

*Cautions of an assembly

pulley (60)

motor (60) assy (M442)

motor (60) assy (M441)

screw (BVTP3 × 8)

brackcet (d-sensor)

L.T MOTOR board

three screws (BVTP3

LOAD SW board

3-11. CD LED Board

)

CD LED board

HCD-GS300AV

Opens to right and left and CD LED BOARD is removed upwards from a slot.

3-12. BU Holder Assy

BU holder assy

tension spring (F1)

tension spring (F-2)

two screws (PTP2.6

HCD-GS300AV

3-13. CD Board, Optical Pick-up (KSM-213BFN)

CD board

Remove two solders.

optical pick-up (KSM-213BFN)

parallel (FFC) (16 core) wire (CN102)

3-14. Cassette Holder, Mech Deck (CMAL1Z221)

cassette holder

Remove two solders.

screw (P2 × 5)

spring cs

cabinet top

mech

deck (CMAL1Z221)

four screws (BVTP3 × 8)

damper

3-15. Belt

ten screws (BVTP2.6 × 8)

knob volume

knob jog

cover jog

nut

front panel assembly

connector 2p (CN706)

connector 2p

(CN704)

DISPLAY board

connector 2p (S791)

two screws

HCD-GS300AV

*Cautions of an assembly

fly wheel

dc motor

deck (CMAL1Z221)

mech

Remove two solders.

fly wheel

belt

dc moto

3-16. DISPLAY Board

HCD-GS300AV

)

3-17. KEY Board

KEY

board

two screws (BVTP2.6

3-18. HEADPHONE Board, GAME LINK Board

decoration panel

GAME LINK

board

two screws (BVTP2.6 × 8

HEADPHONE

board

screw (BVTP2.6 × 8)

3-19. DOOR LED Board

connector 2p (CN704)

CD lid

HCD-GS300AV

Ver 1.3 2003.11

two screw (BVTP2.6)

CD window

CD holder (A)

DOOR LED Board

CD lid

HCD-GS300AV

SECTION 4

TEST MODE

[Panel T est Mode]

Procedure:

1. Press three b uttons of x , [MENU], and [DISPLAY] simultaneously.

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

3. Press the [MENU] button and go to the version display mode. Press the m button and go to the key and jog test mode.

4. To release from these mode, press three buttons in the same manner as step 1, or disconnect the power cord.

– Version display mode –

In the version display mode, each time the [MENU] button is pressed, the display changes in the order of MC, GC, CD, CDD, CDM A, CDM B, BDA, BDB, ST, TA , TM and TC. Press the . button to display the date of the software.

– Key and jog test mode –

In the key check mode, the fluorescent indicator tube displays “K 0 J0 V0”. Each time a button is pressed, “K” value increases without I/1 and [DISPLAY] buttons. Howe ver, once a button is pressed, it is no longer taken into account. “J” value increases like 1, 2, 3 ... if turn the [DISC SELECT] dial clockwise, or it decreases like 0, 9, 8 ... if turn the

[DISC SELECT] dial counterclockwise.

“V” value increases like 1, 2, 3 ... if turn the [VOLUME] knob clockwise, or it decreases like 0, 9, 8 ... if turn the [VOLUME] knob counterclockwise.

[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. Turn the power ON or set to the DEMO mode.

2. Press three b uttons of taneously.

3. The set is reset, and becomes DEMO mode.

x , [CLEAR], and [DISPLAY] simul-

[CD Ship Mode and RAM Initialize]

•This mode moves the optical pick-up to the position durable to

vibration, and initializes the RAM. Use this mode when returning the set to the customer after repair.

Procedure:

1. Press the I/1 button to turn the power ON and select the func- tion CD.

2. Press three b uttons of

X simultaneously.

3. The set is turn the power off and initializes the RAM automatically. A message “LOCK” is displayed on the fluorescent indicator tube, and the CD delivery mode is set.

[ENTER], [SURROUND MODE], and

[CD Service Mode]

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

Procedure:

1. Press the I/1 button to turn the power ON.

2. Select the function “CD”.

3. Press three buttons of [ENTER], M , and

[SURROUND MODE] simultaneously.

4. Set to the Sled Servo mode.

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

optical pick-up to outside track and display “SLED OUT”, or press the m button to move the optical pick-up to inside track and display “SLED IN”.

6. To exit from this mode, perform as follows.

1) Move the optical pick-up to the most inside track.

2) Press three buttons of x , [CLEAR], and [DISPLAY] simultaneously. (cold reset)

Notes: •Always move the optical pick-up 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.

[V ACS T est Mode]

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

Procedure:

1. Press the I/1 button to turn the set on.

2. To enter the test mode, press the two buttons [ENTER] and

[DOLBY PRO LOGIC] simultaneously.

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

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

off.

[Function Selection Mode]

•This mode is used to select the input VIDEO or input MD.

Procedure:

1. Turn off the set.

2. Press the two buttons x and [5.1CH/VIDEO $MD%] simulta-

neously.

3. The message “VIDEO” or “MD” appears.

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

off.

[AM Channel Step 9 kHz/10 kHz Selection Mode]

•The AM tuning interval can be changed over 9 kHz or 10 kHz.

Procedure:

1. Press the I/1 button to turn the power on.

2. Select the function “TUNER”, and press the [TUNER/BAND] button to select the BAND “AM”.

3. Press the I/1 button to turn the power off.

4. Press the [ENTER] and I/1 buttons simultaneously.

5. Either the message “AM 9k STEP” or “AM 10k STEP” appears, and thus the channel step is changed over.

SECTION 5

MECHANICAL ADJUSTMENTS

HCD-GS300AV

SECTION 6

ELECTRICAL ADJUSTMENTS

• TAPE MECHANISM DECK SECTION

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

FWD

FWD back tension

REV

REV back tension

FF/REW

FWD tension

REV tension

Torque meter

CQ-102C

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

Meter reading

2.94 mN • m to 7.84 mN • m 31 to 71 g • cm

(0.43 – 0.98 oz • inch)

0.14 mN • m to 0.59 mN • m

2 to 6 g • cm

(0.02 – 0.08 oz • inch)

2.94 mN • m to 7.84 mN • m 31 to 71 g • cm

(0.43 – 0.98 oz • inch)

0.14 mN • m to 0.59 mN • m

2 to 6 g • cm

(0.02 – 0.08 oz • inch)

6.86 mN • m to 17.64 mN • m 71 to 143 g • cm

(0.98 – 1.99 oz • inch)

more than 0.98 N • m

100 g or more

(3.53 oz or more)

more than 0.98 N • m

100 g or more

(3.53 oz or more)

DECK SECTION

Precaution

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 Check

0 dB = 0.775 V

HCD-GS300AV

)

Record/Playback Head Azimuth Adjustment

Procedure:

1. Mode: Playback (FWD)

test tape P-4-A100 (10 kHz, – 10 dB)

AMP board FRONT SPEAKER terminal (J501) L-CH, R-CH

level meter

set

+ –

2. T urn 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

Adjustment Location:Record/Playback/Erase Head

Head azimuth adjustment screw

Tape Speed Check

Mode: Playback

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

set

frequency counter

+ –

AMP board test tape P-4-A100 (10 kHz, – 10 dB)

L-CH

set

R-CH

in phase 45°90°135°180

FRONT SPEAKER terminal (J501

L-CH

R-CH

waveform of oscilloscope

good

oscilloscope

wrong

4. Reapeat step 1 to 3 in playback (REV) mode.

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

AMP board FRONT SPEAKER terminal (J501) L-CH, R-CH

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

2. Press the bB button on the deck.

3. Confirm that the frequency counter reads 3,000 ± 90 Hz.

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

(WS-48B)

HCD-GS300AV

+ –

CD board

TP (RFAC)

TP (DVC)

oscilloscope

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.

S-curve Check

Connection:

oscilloscope

CD board

TP (FE1)

TP (DVC)

Procedure:

1. Connect an oscilloscope to test point TP (FE1) and TP (DVC)

on the CD board.

2. Turn the power on.

3. Put the disc (YEDS-18) in and turned power switch on again

and actuate the focus search. (actuate the focus search when disc table is moving in and out)

4. Check the oscilloscope waveform (S-curve) is symmetrical

between A and B. And confirm peak to peak level within 2 ± 1 Vp-p.

+ –

RFAC Level Check

Connection:

Procedure:

1. Connect an oscilloscope to test point TP (RFA C) and TP (DVC) on the CD board.

2. Turn the power on.

3. Put the disc (YEDS-18) in to playback the number five track.

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

Note: A clear RFAC signal waveform means that the shape “◊” can be

clearly distinguished at the center of the waveform.

RFAC signal waveform

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

level: 1.35 ± 0.4 Vp-p

S-curve waveform

symmetry

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.

within 2

1 Vp-p

Checking Location: CD board (Conductor side)

(See page 22.)

Checking Location: CD board (Conductor side)

(See page 22.)

HCD-GS300AV

E-F Balance Check

Connection:

oscilloscope

CD board TP (TE1)

TP (DVC)

+ –

Procedure:

1. Connect an oscilloscpe to test point TP (TE1) and TP (DVC) on the CD board.

2. Turn the power on.

3. Select the function “CD”.

4. Press three buttons of [ENTER], M , and

[SURRUUND MODE] simultaneously to set the CD service

mode.

5. Put the disc (YEDS-18) in to playback the number five track.

6. Press the . button. The message “TRAVERSE” is displayed. (The tracking servo and the sledding servo are turned OFF)

7. Check the level B of the oscilliscope's waveform and the A (DC voltage) of the center of the Traverse waveform. Confirm the following : A/B x 100 = less than ± 22%

Traverse Waveform

Center of the waveform

Checking Location:

– CD BOARD (Conductor Side) –

TP (FE1) TP (TE1)

TP (DVC)

IC101

TP (RFAC)

IC103

IC104

level: 1.15 ± 0.5 Vp-p

A (DC

voltage)

8. Press the . button. The message “TRAVERSE” is displayed. (The tracking servo and sledding servo are turned ON) Confirm the C (DC voltage) is almost equal to the A (DC voltage) is step 5.

9. To exit from this mode, perform as follows.

1) Move the optical pick-up to the most inside track.

2) Press three buttons of x , [CLEAR], and [DISPLAY] simultaneously. (cold reset)

Notes: •Always move the optical pick-up 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.

Traverse Waveform

C (DC voltage)

Tracking servo

Sled servo

OFF

Tracking servo

Sled servo

Checking Location: CD board (Conductor side)

+ 50 hidden pages

Sony HCDGS-300-AV Service manual

TABLE OF CONTENTS

SERVICING NOTES

GENERAL

DISASSEMBLY

3-1. Cabinet T op

3-2. Front Cabi Assy

3-3. Back Panel Assy

3-4. MAIN Board, PROLOGIC Board

3-5. AMP Board

3-6. POWER Board

3-7. Holder (LED-S), Bracket (Middle-R), Power Bracket

3-8. CD Mechanism Deck (CDM64B-K1BD47A)

3-9. Base Unit (BU-K1BD47A), D.SENSOR (OUT) Board, T.SENSOR Board

3-10. D.SENSOR (IN) Board, LOAD SW Board, L.T MOTOR Board

3-11. CD LED Board

3-12. BU Holder Assy

3-13. CD Board, Optical Pick-up (KSM-213BFN)

3-14. Cassette Holder, Mech Deck (CMAL1Z221)

3-15. Belt

3-16. DISPLAY Board

3-17. KEY Board

3-18. HEADPHONE Board, GAME LINK Board

3-19. DOOR LED Board

TEST MODE

MECHANICAL ADJUSTMENTS

ELECTRICAL ADJUSTMENTS