Sony HCDGN-700 Service manual

HCD-GN700/GX8800

SERVICE MANUAL

Ver 1.0 2003.04

HCD-GN700/GX8800 are the amplifier, CD player , tape dec k and tuner section in MHC-GN700/GX8800.

CD Section

TAPE Section Tape Transport Mechanism Type CWM43RR23

Photo: HCD-GN700

Model Name Using Similar Mechanism NEW CD Mechanism Type CDM74-K6BD47S Base Unit Name BU-K6BD47S Optical Pick-up Name KSM-213DCP Model Name Using Similar Mechanism HCD-XGR66/XGR600

US Model

HCD-GX8800

E Model

HCD-GN700

SPECIFICATIONS

AUDIO POWER SPECIFICATIONS (MHC-GX8800 USA model 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 MHC-GX8800

Total harmonic distortion Less than 0.1%

(6 ohms at 1 kHz, 100 W)

MHC-GN700

The following are measured at AC 127V, 60 Hz (Mexican model only) The following are measured at AC 120, 220, 240V 50/60 Hz (except Mexican model) DIN power output (rated) 160 + 160 watts

(6 ohms at 1 kHz, DIN)

Continuous RMS power output (reference)

200 + 200 watts

(6 ohms at 1 kHz, 10% THD) 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.

negative load impedance 75 ohms PHONES: accepts headphones of (stereo mini jack) 8 ohms or more FRONT SPEAKER: accepts impedance of 6 to 16 ohms SURROUND SPEAKER: accepts impedance of 24 ohms or more

CD player section

System Compact disc and digital audio system Laser Semiconductor laser

(λ=795nm) Laser Output Max. 44.6 µW*

*This output is the value measured at a

distance of 200 mm from the objective

lens surface on the Optical Pick-up

Block with 7 mm aperture. Frequency response 2 Hz – 20 kHz (±0.5 dB) Wave length 795 nm CD OPTICAL DIGIT AL OUT (Square optical connector jack, rear panel) Wave length 660 nm Output Level –18 dBm

– Continued on next page –

MiNi Hi-Fi COMPONENT SYSTEM

9-877-280-01 Sony Corporation

2003D0200-1 Home Audio Company C 2003.04 Published by Sony Engineering Corporation

HCD-GN700/GX8800

Tape player section

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

TYPE I cassette

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 North and Latin American models:

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

Middle Eastern models: 531 – 1,602 kHz

(with the interval set at 9 kHz)

Other models: 531 – 1,602 kHz

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

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

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

SAFETY CHECK-OUT

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

LEAKAGE

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 microampers). Leakage current can be measured by any one of three methods.

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

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

General

Power requirements US model: 120 V AC, 60 Hz Mexican models: 120 or 127 V AC, 60 Hz Argentina models: 220 V AC, 50/60 Hz Other models: 120 V, 220 V or

230 - 240 V AC, 50/60 Hz

Adjustable with voltage selector Power consumption MHC-GN700 205 watts MHC-GX8800 220 watts Dimensions (w/h/d) Approx. 280 x 360 x 386.5 mm Mass : HCD-GN700/GX8800 Approx. 11.4 kg

Design and specifications are subject to change without notice.

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 dur-

ing 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.

CAUTION

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

3. Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC 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)

T o Exposed Metal

Parts on Set

0.15 µF

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

1.5 kΩ

Earth Ground

Voltmeter (0.75 V)

TABLE OF CONTENTS

HCD-GN700/GX8800

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

2. GENERAL

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

3. DISASSEMBLY

3-1. Case ................................................................................. 8

3-2. Loading (Panel)............................................................... 8

3-3. Front Panel Assy ............................................................. 9

3-4. Tuner Pack, Sub Tr ans Board ......................................... 9

3-5. CD Mechanism Deck ...................................................... 10

3-6. Game In Board, Tape Mechanism Dec k ......................... 10

3-7. CD Switch Board, Display Board .................................. 11

3-8. Volume Board.................................................................. 11

3-9. Subwoofer Board, Rear Panel ........................................ 12

3-10. Main Board...................................................................... 12

3-11. Power Amp Board ........................................................... 13

3-12. SW Board, Driver Board................................................. 13

3-13. CD Board, CD Block Assy ............................................. 14

3-14. Sensor Board ................................................................... 14

3-15. Motor (TB) Board ........................................................... 15

3-16. Motor (LD) Board ........................................................... 15

4. TEST MODE.............................................................. 16

5. MECHANICAL ADJUSTMENTS....................... 20

7-14. Schematic Diagram – Display Board – ......................... 43

7-15. Printed Wiring Board – Power Amp Board – ................ 44

7-16. Schematic Diagram – Power Amp Board – .................. 45

7-17. Printed Wiring Boards – Trans Board – ........................ 46

7-18. Schematic Diagram – Trans Board – ............................. 47

7-19. IC Block Diagram ........................................................... 48

7-20. IC Pin Function Description ........................................... 49

8. EXPLODED VIEWS

8-1. Case, Rear Panel Section ................................................ 54

8-2. Front Panel Section ......................................................... 55

8-3. Chassis Section ............................................................... 56

8-4. CD Mechanism Deck Section-1

(CDM74-K6BD47S) ....................................................... 57

8-5. CD Mechanism Deck Section-2

(CDM74-K6BD47S) ....................................................... 58

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

6. ELECTRICAL ADJUSTMENTS

Deck section .................................................................... 20

CD Section ...................................................................... 22

7. DIAGRAMS

7-1. Circuit Board Location ................................................... 26

7-2. Block Diagram – CD Servo Section –........................... 28

Block Diagram – Tuner/Tape Deck Section –............... 29

Block Diagram – Main/Power Section –....................... 30

Block Diagram – Display Section – .............................. 31

7-3. Printed Wiring Board – CD Board – ............................. 32

7-4. Schematic Diagram – CD Board – ................................ 33

7-5. Printed Wiring Board – CD Mechanism Board – ......... 34

7-6. Schematic Diagram – CD Mechanism Board – ............ 35

7-7. Printed Wiring Boards – Main Board –......................... 36

7-8. Schematic Diagram – Main Board (1/3) – .................... 37

7-9. Schematic Diagram – Main Board (2/3) – .................... 38

7-10. Schematic Diagram – Main Board (3/3) – .................... 39

7-11. Printed Wiring Boards

– Game In, CD Switch Board – ...................................... 40

7-12. Schematic Diagram

– Game In, CD Switch Board – ...................................... 41

7-13. Printed Wiring Board – Display Board – ...................... 42

HCD-GN700/GX8800

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.

GN700 : E2, E3models 4-244-106-0 GN700 : E51 model 4-244-106-1 GN8800 : US models 4-244-106-2 GN700 : Mexican model 4-244-106-3

GN700 :

Argentina model 4-244-106-4

[]

• Abbreviation E2 : 120 V AC Area in E model E3 : 240 V AC Area in E model E51 : Chilean and Peruvian model

Main unit

ALPHABETICAL ORDER A - D

ALBUM +/- qg AMP MENU rd CD r; CD SYNC qj DECK A wk DECK B wd DIRECTION 9 DISC 1~3 3 DISC SKIPEX-CHANGE 4 Disc tray 6 DISPLAY ra

Display 2

E - L

EDIT 9 EFFECT ON/OFF rf FM MODE 8 GAME eh GAME EQ ea

SECTION 2

GENERAL

GAME INPUT (jacks) wj GAME MIXING ef GROOVE ed IR (receptor) rs ILLUMINATION wl

M - Q

MD (VIDEO) ej MIC (jack) wh MIC LEVEL wg MOVIE EQ qh MUSIC EQ eg OPEN/CLOSE Z 5 P FILE wa PHONES (jack) wf PLAY MODE 7 Power illuminator e; PUSH ENTER q;

4 5 61 2 3

HCD-GN700/GX8800

This section is extracted from instruction manual.

R - Z

REC PAUSE/START qk REPEAT 8 SURROUND SPEAKER MODE

TAPE A/B ek TUNER/BAND el TUNER MEMORY 7 VOLUMEws

SYMBOLS

@/1 (power) 1 hH (play) qa x (stop) qs X (pause) qd

. (go backward) qf > + (go forward) qf m (rewind) qg M (fast forward) qg

V/v/B/b q;

A A (Eject A) es A B (Eject B) ql

r r

ea wl

wgwh

HCD-GN700/GX8800

Remote Control

ALPHABETICAL ORDER

This section is extracted from instruction manual.

A - M

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;

P - Z

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

SLEEP 1 TAPE A/B qa TUNER/BAND qk TUNING - wa

TUNING + ws VOL +/- 8

SYMBOLS

@/1 (power) 4 nN (p X (pause) 5 x (stop) 6 .(go backward) wd > (go forward) wf m (rewind) wa M (fast forward) ws

M/m/</, qg

lay)

wf wd ws wa

w; ql

123

4 5

6 7

8 9

q; qa qs

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

SET

CASE

LOADING (PANEL)

FRONT PANEL ASSY

HCD-GN700/GX8800

SECTION 3

DISASSEMBLY

CD MECHANISM DECK

REAR PANEL

MAIN BOARD

POWER AMP BOARD

TUNER PACK,

SUB TRANS BOARD

SW BOARD,

DRIVER BOARD

CD BLOCK ASSY

GAME IN BOARD,

TAPE MECHANISM DECK

CD SWITCH BOARD,

DISPLAY BOARD

VOLUME BOARD

SENSOR BOARD

MOTOR (TB) BOARD

MOTOR (LD) BOARD

CD BOARD,

OPTICAL PICK-UP

(KSS-213DCP)

HCD-GN700/GX8800

)

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

3-1. CASE

Case

Three screws

(case 3 TP2)

Five screws

(+BVTT3 x 6)

T wo screws

(+BVTT3 x 6

3-2. LOADING (PANEL)

CD mechanismdeck (CDM74-K6BD47S)

Turn the pulley to the arrow direction.

Pulley

Front side

Pull out disc tray

Three screws

(case 3 TP2)

Loading (panel)

3-3. FRONT PANEL ASSY

Screw (BVTP3 x 10)

Front panel ASSY

(flat type)

From CN607 on

Game in board

HCD-GN700/GX8800

T wo wires

MAIN boar

CN402

CN304

Four screws (BVTP3 x 10)

3-4. TUNER PACK, SUB TRANS BOARD

Wire (flat type)

(11 core)

CN971

Sub trans board

From deck A head

Screw (BVTP3 x 10)

T uner pack

From deck B head

From CN606 on Game in board

Two screw (BVTP3 x 10)

Three screws

(BVTP3 x 10)

CN976

CN974

HCD-GN700/GX8800

)

3-5. CD MECHANISM DECK

CD mechanism deck

CN701

Wire (flat type) (31 core)

Two screws (BVTP3 x 10

CN201

3-6. GAME IN BOARD, TAPE MECHANISM DECK

Tape mechanism deck

Screw (+PTT2 x 4)

Three screws

(+BVTP2.6 x 8)

MAIN board

Two screws (+BVTP2.6 x 8)

Screw (+PTT2 x 4)

Shield plate (GHX)

T wo screws

(+BVTP2.6 x 8

Knob (MIC)

GAME IN board

T wo screws

(+BVTP2.6 x 8)

3-7. CD SWITCH BOARD, DISPLAY BOARD

)

Six screws

(+BVTP2.6 x 8)

CD SWITCH board

Five screws

(+BVTP2.6 x 8)

Wire (flat type) (17 core)

from CN604

HCD-GN700/GX8800

DISPLAY board

Five screws

(+BVTP2.6 x 8

3-8. VOLUME BOARD

Knob (VOL)

VOLUME board

Four claws

Three screws

(+BVTP2.6 x 8)

Three screws

(+BVTP2.6 x 8

Hexagonal nut

HCD-GN700/GX8800

)

3-9. REAR PANEL

rear panel

with fan

two screws

(+BVTT3 x 6)

two screws

(+BVTP3 x 10

three screws

(+BVTP3 x 10

three screws

(+BVTP3 x 10)

3-10. MAIN BOARD

Connector

CN998

main board

TRAN board

CN851

connector

POWER AMP board (CN503, 504)

MAIN board (CN901, 902)

MAIN boar

Screw

(+BVTP3 x 10)

T wo screws

(+BVTP3 x 10)

3-11. POWER AMP BOARD

Bracket (HS)

T wo screws

(+BVTP3 x 10)

T wo screws

(+BVTP3 x 10)

T wo screws

(+BVTP3 x 10)

HCD-GN700/GX8800

Three screws

(+BVTP3 x 10)

POWER AMP boar

Connector

from CN997

3-12. SW BOARD, DRIVER BOARD

SW board

Screw

(+BTTP (M2.6))

CN704

CN702 (flat type)

CN703

DRIVER boar

Two

screws

(+BTTP (M2.6))

HCD-GN700/GX8800

3-13. CD BOARD, CD BLOCK ASSY

(insulator)

Holder (213) ASSY

CD block ASSY

Two

insulators

Two

coil springs

Two stoppers (BU)

Two screws

(BVTT M2.6)

Floating

(+PTPWH M2.6)

Floating

(+PTPWH M2.6)

Two

insulators

Two

(insulator)

Two floating

(+PTPWH M2.6)

CN708 (flat type)

CD board

screw

coil springs

screws

3-14. SENSOR BOARD

Tray

Remove the four solderings of motor.

Floating

(+PTPWH M2.6)

Floating

(+PTPWH M2.6)

Gear (geneva)

screw

Screw

(+BTTP (M2.6))

screw

SENSOR board

CN731

Screw (+BTP 2.6x 8)

Belt (table)

Foating

(+PTPWH M2.6)

screw

Pulley (table)

3-15. MOTOR (TB) BOARD

Table motor ASSY (M741)

HCD-GN700/GX8800

3-16. 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))

CN742 (flat type)

MOTOR (LD) board

Belt (loading)

HCD-GN700/GX8800

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 x button, [AMP MENU] button and [DISC 2] button

simultaneously.

2. All LEDs and segments in fluorescent indicator tube are lighted

up.

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

press

[DISC 1] b utton. The model and destination are displayed.

4. Each time

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

5. When

are being displayed except model and destination, the date of the software creation appear. When again, the display returns to the software version display . When

[DISC 1] b utton is pressed, the display changes from

[DISC 3] button is pressed while the version numbers

[DISC 3] button is pressed

[DISC 1] b utton is pressed while the date of the software creation

is being displayed, the date of the software creation is displayed in the same order of software version display.

6. Press

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

8. When

9. When

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

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

“K 0 V 0”. Each time a button is pressed, “K” value increases. However, once a button has been pressed, it is no longer taken into account. “V” value increases in the manner of 0,1, 2, 3 ... if knob is turned clockwise, or it decreases in the manner of 0, 9, 8,7 ... if

[VOLUME] knob is turned counter-clockwise.

[VOLUME]

[DISC 3] button is pressed after all LEDs and segments

in fluorescent indicator tube light up, the fluorescent indicator tube displays “VACS A + B”. A is VACS level which is trigger by signal level while B is VACS lev el which is trigger by thermal. Total VACS value would be the sum of A and B.

[DISC SKIP/EX-CHANGE] button is pressed after all

LEDs and segments in fluorescent indicator tube light up, alternate segments in fluorescent indicator tube would light up. If you press half of alternate segments in fluorescent indicator tube would light up. Pressing would case all segments lights up.

step 1, or disconnect the power cord.

[DISC SKIP/EX-CHANGE] button again, another

[DISC SKIP/EX-CHANGE] button again

[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 x button, [AMP MENU] button and [DISC 3] button

simultaneously.

2. The TAPE A and TAPE B segments flash on the fluorescent

indicator tube. The function is changed to VIDEO.

* Check of Amplifier

1. When V b utton is pressed, GEQ increases to its maximum and a message “GEQ MAX” appears on the fluorescent indicator tube.

2. When v b utton is pressed, GEQ decreases to its minimum and a message “GEQ MIN” appears on the fluorescent indicator tube.

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

4. When the 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 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. To check the frequency of clock used to run the clock of the system, the clock output is available at IC501 pin ek (CLOCK- OUT) on the MAIN board during MC test mode.

2. The frequency is 32.768 kHz.

* T ape function

1. When a tape is inserted in Deck B and recording is started, the function is changed to VIDEO automatically . When button is pressed during recording in function, ALC (Automatic Logic Control) is turned on.

2. After recording is stopped by pressing x button, press

button will change the function to TAPE B and rewind Tape B until the recording start position and playback of Tape B is started. If the pause and pressed again to resume recording during recording time, when tape deck B is rewind, tape deck B will be rewind until the position where the pause is applied.

* AMS Test Mode

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

2. Select Loop or Relay direction mode by pressing the

[VOLUME] knob is turned clockwise even slightly,

[VOLUME] knob is turned counter-clockwise even

[CD SYNC]

[REC PAUSE/ START] button is pressed for a

[DIRECTION] button. Insert a test tape AMS-110A or AMS-

120 to selected tape deck.

3. Press the

4. After the test tape is rewind to the beginning of the tape, the AMS+ is checked, and the mechanism is shut off after detecting the AMS signal twice.

5. Then the 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

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

[AMP MENU] button to enter the AMS test mode.

button.

?/1

HCD-GN700/GX8800

[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 x button, [AMP MENU] button, and

simultaneously.

2. The fluorescent indicator tube becomes blank for a while, and

the set is reset.

?/1

button

[VACS ON/OFF]

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

Procedure:

1. Press

2. Press

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

button to turn the set ON.

?/1

[AMP MENU] button and [GAME MIXING] button

[TUNER STEP CHANGE]

• The step interval of AM c hannels can be toggled between 9 kHz and 10 kHz.

Procedure:

1. Press

2. Press

3. Press

4. Press [AMP MENU] button and

The system will turn ON automatically. The message “AM 9k STEP” or AM 10k STEP” appears and thus the channel step is changed.

button to turn the set ON.

?/1

[TUNER/BAND] button to select the “AM”.

button to turn the set OFF.

?/1

button simultaneously.

?/1

[AGING MODE]

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

• If an error occurs, the aging operation would stops and the status is displayed.

• If there are no error occurs, the aging operation would continues repeatedly.

Procedure:

1. Press

2. Select CD function.

3. Load three discs on the disc tray.

4. Press

and press the

5. Press x button, [AMP MENU] button, and [DISC SKIP/ EX-

button to turn the set ON

?/1

[PLAY MODE] button to select the “ALL DISCS” mode,

[REPEAT] button to select “REPEA T OFF” mode.

CHANGE] button simultaneously.

6. Aging operation is started.

7. To release this mode, press

power cord to turn the power OFF.

Aging mode sequence:

Start (from disc 1)

Disc chucking

TOC reading

Play first track for 2 seconds

Play last track for 2 seconds

button or disconnect the

?/1

[CD SERVICE MODE]

• This mode let you move the CD sled motor freely . Use this mode when you want to clean the optical pick-up.

Procedure:

1. Presd

2. Select CD function.

3. Press x , [AMP MENU] b utton, and

simultaneously.

4. The CD service mode is activated. The message “SERVICE

MODE” appears.

5. With the CD in stop status, press

optical pick-up to outside track, or press to inside track. The message “SLED OUT” or “SLED IN”

appears.

6. To release this mode, press

button to turn the set ON.

?/1

OPEN/CLOSE

button to move the

button.

button

button to move

EX-CHANGE open/close

Open the disc tray

Disc skip

Close the disk tray

Change the next disc.

HCD-GN700/GX8800

• Display when an error occurred (CD Error Code Mode)

Procedure:

1. Press x button, [AMP MENU] button and [DISC 1] button simultaneously to enter the error code display mode.

2. The fluorescent indicator tube displays the number of total error.

3. Each time 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 power plug to turn the power OFF.

1) Display of total error

button or

Display of total error

Button Display of Mechanical errors

Button

Display of no disc errors

Display

button is pressed, display

–

Button

–

Button

button or disconnect the

?/1

3) Display of no disc errors

Display

D*$$%%&&##00

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

01: Focus error 02: GFS error

03: Setup error %%: Not used &&:

00: No disc judgment without chucking retry.

01: No disc judgment after chucking retry. ##: The state when judged as no disc

01: Stop

02: Setup

03: TOC reading

04: Access

05: Playback

06: Pause

07: Manual search (Play)

08: Manual search (Pause)

button or

button to display next error)

EMC**EDC**

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

2) Display of mechanical errors

Display

M*$$%%&&##00

M*: The number of mechanical error (“00” is latest one) (Press $$: Not used

%%: Loading related error (Second figure is not used)

D: Stop by the problem other than mechanical problem while

E: Stop by the problem other than mechanical problem while

C: Stop by the problem other than mechanical problem while

F: Stop by the problem other than mechanical problem while

&&: Emerging error

01: Stop while chucking up. 02: Stop while chucking up. 03: Time-out of EX-CHANGE open. 05: Time-out of EX-CHANGE close.

##: Not used

button or

closing.

opening.

chucking up.

chucking down.

button to display next error)

[CD REPEAT 5 LIMIT OFF MODE]

• The number of repeat for CD playback is 5 times when the repeat

mode is “REPEAT ALL”. This mode enables CD to repeat playback for limitless times.

Procedure:

1. Press

2. Select CD function.

3. Press x button, [REPEAT] button and [CD] button

simultaneously to enter the CD repeat 5 limit off mode and the

fluorescent indicator tube displays “LIMIT OFF”.

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

COLD RESET”)

button to turn the set ON.

?/1

[CD SHIP MODE (WITH MEMORY CLEAR)]

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

vibration and clears all data including preset data stored in the RAM to initial conditions. Use this mode when returning the set to the customer after repair.

Procedure:

1. Press

2. Select CD function.

3. Press x button, [AMP MENU] button and [GAME] button

simultaneously. The set will power off automatically.

4. After the “STANDBY” blinking display finish, a message

“LOCK” is displayed on the fluorescent indicator tube and the

CD ship mode is set.

button to turn the set ON.

?/1

HCD-GN700/GX8800

[CD SHIP MODE (WITHOUT 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. Press

2. Select CD function.

3. Press [CD] button and

will power off automatically.

4. After the “STANDBY” blinking display finish, a message

“LOCK” is displayed on the fluorescent indicator tube and the CD ship mode is set.

button to turn the set ON.

?/1

button simultaneously. The set

[CD POWER MANAGE]

• This mode let you switch on or off power supply to the BU during TUNER function.

• When CD POWER is set to OFF, the power supply to the BU is cut off during TUNER function. It will increase the time taken to access CD when function change from TUNER to CD but it will improve tuner reception.

• When CD POWER is set to ON, the power supply to the BU is not cut off during TUNER function. It will reduce the time taken to access CD when function change from TUNER to CD but it will decrease tuner reception performance.

Procedure:

1. Press

2. Select CD function.

3. Press

4. Press x button and

power on automatically.

5. The message “CD POWER ON” or “CD POWER OFF” will

be displayed on the fluorescent indicator tube.

button to turn the set ON.

?/1

button to turn the set OFF.

?/1

button simultaneously . The set will

[CD TRAY LOCK MODE]

• This mode let you lock the disc trays. When this mode is activated, the disc tray will not open when button or [DISC SKIP/EX-CHANGE] button is pressed. The

message “LOCKED” will be displayed in the will be displayed on the fluorescent indicator tube.

Procedure:

1. Press

2. Select CD function.

3. Press x button and

and hold down until “LOCKED” or “UNLOCKED” displayed on the fluorescent indicator tube (around 5 seconds).

button to turn the set ON.

?/1

OPEN/CLOSE

button simultaneously

[MD/VIDEO SWITCHING]

• This mode let you switch from MD to VIDEO and vice-versa.

Procedure:

1. Press

2. Select MD function.

3. Press [MD $VIDEO%] button and

The function will change to VIDEO. Press the same buttons again to change from VIDEO to MD.

button to turn the set ON.

?/1

button simultaneously .

?/1

HCD-GN700/GX8800

SECTION 5

MECHANICAL 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

FWD

back tension

REV

back tension

FF/REW

FWD tension

REV tension

Torque meter

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)

SECTION 6

ELECTRICAL ADJUSTMENTS

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

RECORD/PLAYBACK 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)

0 dB=0.775 V

MAIN board CN301 Pin

1 3

set

MAIN board CN301

(L-CH) (R-CH)

(GND)

level meter

+ –

HCD-GN700/GX8800

attenuator

set

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

1) 315 Hz

2) 10 kHz

50 mV (–23.8 dB)

  

600

Ω

blank tape CN-123

AF OSC

–

set

recorded portion

MAIN board CN301 Pin

(GND)

MAIN board CN301 Pin

(L-CH)

(R-CH)

level meter

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

L R

oscilloscop

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

5. Mode: Playback

waveform of oscilloscope

in phase 45°90°135°180

good

wrong

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

Adjustment Location: Playback Head (Deck A).

Record/Playback/Erase Head (Deck B).

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 RV354 (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

forward

reverse

HCD-GN700/GX8800

–

CD board

TP4 (FE)

TP7 (DVC)

oscilloscope

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.

4. Mode: Record

MAIN board MD/VIDEO (AUDIO) IN (J117)

AF OSC

5. Mode: Playback

315 Hz, 50 mV (–23.8 dB)

Ω

attenuator

600

blank tape CS-123

set

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:

Procedure:

1. Connect an oscilloscope to test point TP4 (FE) and TP 7(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 lev el within 2.4 ± 1 Vp-p.

MAIN board

recorded portion

CN301

Pin Pin

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 repea t 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

– MAIN BOARD (Component Side) –

REC LEVEL

ADJUSTMENT









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 2.4

1 Vp-p

Checking Location: CD board (SIDE B)

(See page 24.)

31 CN301

(R-CH)

RV351

REC BIAS ADJUSTMENT

IC301

RV304

(L-CH)







(R-CH)

RV301

(L-CH)

RV354





+ 50 hidden pages