Sony HCD-GX450 Schematic

HCD-GX450

SERVICE MANUAL

Ver. 1.3 2006.10

• HCD-GX450 is the tuner, deck, CD and amplifier section in MHC-GX450.

CD Section

Tape deck Model Name Using Similar Mechanism New New Section T ape Transport Mechanism Type CWM43FF-05 CWM43FF-05

Model Name Using Similar Mechanism New New CD Mechanism Type CDM74-F1BD81 Optical Pick-up Name

US Model

Canadian Model

Former Type Models

KSM-215DCP/C2NP KSM-213DCP/C2NP

New Type Models

CDM74KF-K6BD81C

Amplifier section AUDIO POWER SPECIFICATIONS

POWER OUTPUT AND TOTAL HARMONIC DISTORTION:

With 6 ohm loads, both channels driven, from 120 – 10,000 Hz: rat ed 125 watts per ch annel minimum RMS power, with no more than 10% total harmonic distortion from 250 mil liwatts to rated output.

Front speaker Continuous RMS power output (reference):

125 + 125 watts (6 ohms at 1 kHz, 10% THD)

Total harmonic distortion less than 0.07% (6 ohms at

1kHz, 60 W) Sub woofer Continuous RMS power output (reference):

150 watts (6 ohms at

50 Hz, 10% THD) Total harmonic distortion less than 0.07% (6 ohms at

50 Hz, 75 W)

CD player section

System Compact disc and dig ital

audio system

SPECIFICATIONS

Laser Semiconductor laser

(λ=780 nm) Emission duration:

continuous

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

Tape deck section

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

using Sony TYPE I cassettes

Tuner section

FM stereo, FM/AM super he ter odyne tuner

FM tuner section

Tuning range 87.5 – 108.0 MHz

(100-kHz step) Antenna FM lead antenna Antenna terminals 75 ohms unbalanced Intermediate frequency 10.7 MHz

AM tuner section

Tuning range 530 – 1,710 kHz

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

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

General

Power req uirements 120 V AC, 60 Hz Power consumption USA models: 265 watts Canadian models: 330 VA Dimensions (w/h/d) incl. projecting parts and controls Amplifier/Tuner/Tape/CD section:

Approx. 280 × 327 × 425 mm

Mass Approx. 10.0 kg

Design and specifications are subject to change without notice.

9-877-534-04

MINI HI-FI COMPONENT SYSTEM

Sony Corporation

Home Audio Division Published by Sony Techno Create Corporation

HCD-GX450

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

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

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

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

To Exposed Metal

Parts on Set

0.15 µF

1.5 kΩ

Earth Ground

Voltmeter (0.75 V)

The release method of a CD disc tray LOCK function

There is a disc lock function for the disc theft prevention for a demonstration at a shop front in this machine. Procedue:

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

2. Press two buttons of x and Z (EJECT) simultaneously for five seconds.

3. The message “LOCKED” is displayed and the tray is locked. (Even if exiting from this mode, the tray is still locked.)

4. Press two buttons of x and Z (EJECT) simultaneously for five seconds again.

5. The message “UNLOCKED” is displayed and the tray is unlocked.

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

Unleaded solder

Boards requiring use of unleaded solder are printed with the leadfree mark (LF) indicating the solder contains no lead. (Caution: Some printed circuit boards may not come printed with the lead free mark due to their particular size.)

: LEAD FREE MARK

Unleaded solder has the following characteristics.

• Unleaded solder melts at a temperature about 40°C higher than ordinary solder. Ordinary soldering irons can be used but the iron tip has to be applied to the solder joint for a slightly longer time. Soldering irons using a temperature regulator should be set to about 350°C. Caution: The printed pattern (copper foil) may peel away if the heated tip is applied for too long, so be careful!

• Strong viscosity Unleaded solder is more viscous (sticky , less prone to flow) than ordinary solder so use caution not to let solder bridges occur such as on IC pins, etc.

• Usable with ordinary solder It is best to use only unleaded solder but unleaded solder may also be added to ordinary solder.

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 .

ATTENTION AU COMPOSANT AYANT RAPPORT

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.

À LA SÉCURITÉ!

HCD-GX450

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

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

NOTES ON LASER DIODE EMISSION CHECK

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

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

TABLE OF CONTENTS

1. SERVICING NOTE·························································· 4

2. GENERAL ·········································································· 6

3. DISASSEMBLY

3-1. Cover (Top) ····································································· 9 3-2. CD Door·········································································· 9 3-3. Front Panel Section ······················································· 10 3-4. CD Mechanism Deck (CDM74-F1BD81) ···················· 10 3-5. Tape Mechanism Deck, Game Jack Board ··················· 11 3-6. PANEL Board ······························································· 11 3-7. Back Panel Section, SUB-TRANS Board ···················· 12 3-8. Power Transformer·······················································12 3-9. MAIN Board ································································· 13 3-10. SUB-WOOFER Board················································ 13 3-11. AMP Board ································································· 14 3-12. BD81A Board ····························································· 14 3-13. CONNECT Board·······················································15 3-14. DRIVER Board, SW Board ········································ 15 3-15. Optical Pick-up (KSM-215DCP/C2NP) ····················· 16 3-16. SENSOR Board ·························································· 16 3-17. MOTOR (TB) Board··················································· 17 3-18. MOTOR (LD) Board ·················································· 17

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

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

CAUTION

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

Notes on chip component replacement

•Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be damaged by heat.

Flexible Circuit Board Repairing

•Keep the temperature of soldering iron around 270˚C during repairing.

• Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering or unsoldering.

5. DIAGRAMS

5-1. Block Diagrams – PANEL Section – ···························· 22

– MAIN Section – ······················································· 23 – BD/DRIVER Section – ············································ 24

– SUB-WOOFER Section – ········································ 25 5-2. Printed Wiring Board – BD81A Section –··················· 26 5-3. Schematic Diagram – BD81A Section – ····················· 27 5-4. Printed Wiring Board

– CD MECHANISM Section – ··································· 28 5-5. Schematic Diagram – CD MECHANISM Section –···29 5-6. Printed Wiring Board – MAIN Section – ···················· 30 5-7. Schematic Diagram – MAIN Section (1/2) – ·············· 31 5-8. Schematic Diagram – MAIN Section (2/2) – ·············· 32 5-9. Printed Wiring Board – PANEL COMB Section –······ 33 5-10. Schematic Diagram – PANEL COMB Section – ······34 5-11. Printed Wiring Board – SUB-WOOFER Section – ··· 35 5-12. Schematic Diagram

– SUB-WOOFER Section – ········································ 36 5-13. Printed Wiring Board – PANEL Section –················· 37 5-14. Schematic Diagram – PANEL Section (1/2) – ··········38 5-15. Schematic Diagram – PANEL Section (2/2) – ··········39 5-16. Printed Wiring Board – TRANS Section – ················ 40 5-17. Printed Wiring Board – AMP Section –····················· 41 5-18. Schematic Diagram – AMP POWER Section – ········42 5-19. IC Pin Function Description ······································· 46

6. EXPLODED VIEWS

6-1. MAIN Section·······························································51 6-2. Front Panel Section ······················································· 52 6-3. MAIN Board Section ···················································· 53 6-4. CD Mechanism Deck Section -1 (CDM74-F1BD81)··· 54 6-5. CD Mechanism Deck Section -2 (CDM74-F1BD81)··· 55

7. ELECTRICAL PARTS LIST ······································· 56

HCD-GX450

• SERVICE POSITION -1 (AMP BOARD)

To inspect the AMP board, turn both of the front panel and the CD mechanism deck so that the left side of the product faces down.

CD mechanism deck

SECTION 1

SERVICING NOTE

front panel

AMP boar

• SERVICE POSITION -2 (BD81A BOARD)

Remove the CD mechanism deck and place it on top of the pedestal as shown. Inspect the BD81A bard in this set up.

HCD-GX450

BD81A board

CD mechanism dec

HCD-GX450

Illustrati

SECTION 2

GENERAL

List of button locations and reference pages

How to use this page

Use this page to find the loca tio n of buttons and other parts of the system that are mentioned in the text.

Main unit

ALPHABETICAL ORDER

A – O P – Z

ALBUM + ALBUM – CD eg (9, 11, 14, 19, 20) CD SYNC wj (19) Deck A wk (18) Deck B qj (18, 19, 20, 24) DISC 1 – 3 q; (12, 14, 35) DISC SKIP/EX-CHANGE qs

Disc tray 9 (11) DISPLAY 2 (17, 27, 28) Display window 5 EFFECT ON/OFF 8 (22) ENTER qa (14, 15 , 22) EQ BAND 7 (22) GAME es (20, 23, 30) GAME INPUT AUDIO L/R jacks

GAME INPUT VIDEO jack wf

GAME MIXING wh (23) GROOVE 8 (21) ILLUMINATION Operation Dial

qh (12, 14, 19)

wg (12, 14, 19)

(11, 12, 14, 19)

wd (20, 29)

(29)

3 (28)

(– EQ +/l L) 6 (12, 14, 19, 22)

P FILE qd (22) PHONES jack ql PLAY MODE wl (12, 14, 18, 19,

20, 35) Power illuminator qk (28) PRESET EQ qd (22) REC PAUSE/START wj (19, 20,

23, 24) Remote sensor 4 SURROUND 8 (23) TAPE A/B ed (18, 19, 20, 24) TUNER/BAND ef (15, 16, 20) TUNING MODE wl (15, 16, 35) TUNING + qh (15, 16) TUNING – wg (15, 16) VOLUME control w; (21)

12345 6 78 9

eg ef ed es

e; wl wk wj

on number

TAPE A/B ed (18, 19 , 2 0, 24)

Name of button/pa rt Reference page

BUTTON DESCRIPTIONS

?/1 (power) 1 (8, 16, 27, 30, 33,

35)

X (pause) wg (12, 19) Z (eject) qf (11) PUSH Z (deck B) (eject) qg (18) x (stop) wg (12, 19, 24, 35) M (fast forward) qh (12, 19) H (play) qh (12, 18, 19) m (rewind) wg (12, 19) Z PUSH (deck A) (eject) e; (18)

ALBUM

TUNING TUNING

ALBUM

qs qd qf qg qh qj qk

wfwg

HCD-GX450

Remote control

ALPHABETICAL ORDER

A – E

ALBUM – qd (12, 14) ALBUM + qa (12, 14) CD qk (11, 14) CLEAR qg (14) CLOCK/TIMER SELECT 2

(26, 27)

CLOCK/TIMER SET 3 (10, 25,

26) DISC SKIP q; (12, 14) DISPLAY wa (17, 27, 28) ENTER 9 (10, 14, 15, 25, 26) EQ qf (22)

F – Z

FM MODE 4 (17) FUNCTION 6 (11, 14, 15, 16) PLAY MODE w; (12, 14, 18) REPEAT 4 (13) SLEEP ws (25) TAPE qj TUNER BAND 5 (15, 16) TUNER MEMORY ql (15) TUNING MODE w; (15, 16) VOLUME +/– qs (21, 25)

BUTTON DESCRIPTIONS

?/1 (power) 1 (8, 26) m/M (rewind/fast forward)

7 (12, 19) –/+ (tuning) qh (15) ./> (go back/go forward)

qh (10, 12, 19)

N (play) 8 (12, 18) X (pause) 8 (12, 19) x (stop) 8 (12, 19)

Setting the clock

Use buttons on the remote for the operation.

Press ?/1 to turn on the system.

Press CLOCK/TIMER SET.

Press . or > repeatedly to set the hour.

Press ENTER.

Press . or > repeatedly to set the minute.

Press ENTER.

The clock starts working.

To adjust the clock

Press CLOCK/TIMER SE T.

Press . or > repeatedly to select “CLOCK SET”, then press ENTER.

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.

ws wa w; ql qk qj

qg qf

1 2 3 4 5 6

7 8

9 q;

qa qs

HCD-GX450

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

SET

3-1.COVER (TOP)

(Page 9)

3-2.CD DOOR

(Page 9)

SECTION 3

DISASSEMBLY

3-3.FRONT PANEL SECTION

(Page 10)

3-4.CD MECHANISM DECK

(CDM74-F1BD81)

(Page 10)

3-12.BD81A BOARD

(Page 14)

3-7.BACK PANEL SECTION,

SUB-TRANS BOARD

(Page 12)

3-8.POWER TRANSFORMER

(Page 12)

3-5.TAPE MECHANISM DECK,

GAME JACK BOARD

(Page 11)

3-13.CONNECT BOARD

(Page 15)

3-14.DRIVER BOARD,

SW BOARD

(Page 15)

3-9.MAIN BOARD

(Page 13)

3-10.SUB-WOOFER BOARD

3-6.PANEL BOARD

(Page 11)

3-15.OPTICAL PICK-UP

(KSM-215DCP/C2NP)

(Page 16)

(Page 13)

3-16.SENSOR BOARD

(Page 16)

3-17.MOTOR (TB) BOARD

(Page 17)

3-18.MOTOR (LD) BOARD

(Page 17)

3-11.AMP BOARD

(Page 14)

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

3-1. COVER (TOP)

cover

(top)

two screws (Case 3 TP2)

cover

(Side-L)

two

screws (+BVTP 3

HCD-GX450

10)

screw (case 3 TP2)

3-2. CD DOOR

screw

(+BVTP 3

× 10

)

screw

(+BVTP 3

× 10

)

cover

(Side-R)

two claws

(+BVTP 3

two screws

(case 3 TP2)

(+BVTP 3

screw (Case 3 TP2)

screw

× 10

)

CD mechanism deck (CDM74)

Turn the pulley to the direction of arrow.

Front panel side

pulley

Pull-out the disc tray.

CD door

HCD-GX450

)

3-3. FRONT PANEL SECTION

connector 3p (CN304C)

wire (flat type) 17 core (CN253)

connector 2p (CN805)

screw (+BVTP 3

10)

screw (+BVTP 3

× 8

)

screw (+BVTP 3

× 8

)

front panel section

3-4. CD MECHANISM DECK (CDM74-F1BD81)

screw (+BVTP 3

connector 8p (CN103)

connector 5p (CN309)

wire (flat type) 29 core (CN302)

three screws (+BVTP 3

connector 3p (CN102B)

× 8

)

three

10)

screws (+BVTP 3

CD mechanism deck (CDM74-F1BD81)

connector 9p (CN254)

connector 12p (CN701)

3-5. TAPE MECHANISM DECK, GAME JACK BOARD

)

wire (flat type) 13 core (CN602)

tape mechanism deck

HCD-GX450

six

screws

(+BVTP 2.6

3-6. PANEL BOARD

seven

claws

GAME JACK board

two

(+BVTP 2.6

connector 6p (CN604)

screws

connector 5p (CN605)

PANEL board

ten

screws

(+BVTP 2.6

HCD-GX450

)

3-7. BACK PANEL SECTION, SUB-TRANS BOARD

SUB-TRANS board

(+BVTT 3

connector

2p (CN904)

two

screws

× 10

)

connector

2p (CN901)

connector

3p (CN308)

back panel section

(+BVTT 3

three

screws

10)

two

screws

(+BVTP 3

3-8. POWER TRANSFORMER

connector

3p (CN905)

wire (flat type) 11 core (CN101)

four

screws

(+ITC 4

× 8

)

power transforme

screw

(+BVIT 3

× 8R

)

connector

10p (CN907)

earth wire

3-9. MAIN BOARD

connector

10p (CN907)

connector

4p (CN501)

MAIN

Main board

HCD-GX450

boar

3-10. SUB-WOOFER BOARD

two

(transistor)

screws

13p (CN441)

two

(+BVTP 3

connector

7p (CN502)

two

(+BVTP 3

connector

screws

× 8

)

screws

× 8

)

SUB-WOOFER boar

HCD-GX450

)

3-11. AMP BOARD

two

screws

(+BVIT 3

two

screws

(transistor)

× 8R

)

AMP

screw

(+BVTP 3

board

14)

two

screws

(+BVTP 3

heat sink

× 8

3-12. BD81A BOARD

Remove soldering from the four points.

wire (flat type) 27 core (CN202)

screw

(+BVTP 2.6

BD81A

board

× 8

)

wire (flat type) 16 core (CN101

3-13. CONNECT BOARD

two

(+BVTP 2.6

CONNECT

screws

board

wire (flat type) 27 core (CN251)

× 8

)

HCD-GX450

3-14. DRIVER BOARD, SW BOARD

(+BTTP (M2.6))

DRIVER

wire (flat type) 5p (CN702)

two

screws

board

connector

4p (CN703)

screw

(+BTTP (M2.6))

SW board

HCD-GX450

3-15. OPTICAL PICK-UP (KSM-215DCP/C2NP)

optical pick-up

(KSM-215DCP/C2NP)

two

insulators

two

coil springs

(insulator)

wo stoppers (BU)

older (213) ASSY

floating

(+PTPWH M2.6)

two

insulators

two

coil springs

(insulator)

screw

(BVTT M2.6)

floating

(+PTPWH M2.6)

screw

3-16. SENSOR BOARD

ray

(BVTT M2.6)

Remove the four solderings of motor.

floating

(+PTPWH M2.6)

floating

(+PTPWH M2.6)

screw

(+BTTP (M2.6))

screw

wo screws

crew

SENSOR board

connector

(

CN731)

CN101 (flat type)

D81A board

crew (+BVTP 2.6x 8)

elt (table)

floating

(+PTPWH M2.6)

screw

ulley (table)

ear (geneva)

3-17. MOTOR (TB) BOARD

stopper

able motor assy (M741)

HCD-GX450

3-18. MOTOR (LD) BOARD

Remove the two solderings of motor.

oading motor assy (M751)

MOTOR (TB) board

Remove the two solderings of motor.

two

screws

(+BTTP (M2.6))

two

screws

(+BTTP (M2.6))

MOTOR (LD) board

wire (flat type) 5 core (CN742)

elt (loading)

HCD-GX450

SECTION 4

TEST MODE

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

•A step of AM channels can be changed ov er 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 PLAY MODE/TUNING MODE and ?/1 buttons si-

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

[Cold Reset]

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

Procedure:

1. Press three buttons x , PLAY MODE/TUNING MODE ,

and DISC 1 simultaneously.

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

the set is reset.

[Aging Mode]

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

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

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

1. Operating method of Aging Mode

Press ?/1 button to turn the set ON and select “CD” of the function.

1) Set three discs in tray . Press the

PLA Y MODE/TUNING MODE button to set the “ALL DISCS” mode, and the PRESET EQ button to “REPEAT” off.

2) Load the tapes recording use into both decks.

3) Press three buttons x , PLAY MODE/TUNING MODE , and EX-CHANGE simultaneously.

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

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

2. Aging mode in CD section

1) Operation during aging mode

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

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

“AGING ∗∗∗∗” value increases.

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

2) Error display

Disc error

Display Error

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

Mechanism error

Display Error

E00M__E_0 Error during opening tray E00M__C_2 EX-CHANGE disc error E00M__D_0 Error during closing tray E00M__F_3 EX-OPEN error E00M__D_5 EX-CLOSE error E00M__C_2 Chuck-up error E00M__C_3 Unchucking error

3. Aging mode in Tape Deck section

1) Operation during aging mode

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

Step

Rewind the TAPE A

Rewind the TAPE B

Play the TAPE A (1 minute)

Stop the TAPE A (1 second)

Play the TAPE A (3 minutes)

Rewind(AMS) the TAPE A

F.F.(AMS) the TAPE A

Play the TAPE B (1 minute)

Stop the TAPE B (1 second)

Record the TAPE B (3 minutes)

Rewind(AMS) the TAPE B

F.F.(AMS) the TAPE B

Operation

Display

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

2) Error display

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

4. Exiting from the aging mode

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

HCD-GX450

[P ANEL T est Mode]

• All fluorecent segments and LEDs are tested.

•Keyboard check.

Procedure:

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

2. To enter the test mode, press the three buttons x , PLAY MODE/TUNING MODE and ENTER simultaneously.

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

4. Press X and ENTER buttons simultaneously, and the key check mode is activated.

5. The message “KEY 0 0 0 ” is displayed. Each time a button is pressed, the key code number is displayed.

6. Press X and ENTER buttons simultaneously, and the key count mode is activated.

7. The message “KEYCNT 0” is displayed. Each time a button is pressed, “KEYCNT 0” value increased. However, once a button is pressed, it is no longer taken into account.

8. Press X and ENTER buttons simultaneously, and the head phone detect mode is activated.

9. The message “H_P OFF” is displayed when a headphone jack is not inserted. “H_P ON ” is displayed when a headphone jack is inserted.

10. Press X and ENTER b uttons simultaneously , and the volume control detect mode is activated.

11. The message “VOLUME FLAT” is displayed. “VOLUME UP” is displayed if rotating MASTER VOLUME knob clockwise, or “VOLUME DO WN” is displayed if rotating counterclockwise.

12. To exit from the GC test mode after the head phone detect mode, press X and ENTER buttons simultaneously.

[Version and Destination Display Mode]

•The version or destination is displayed.

Procedure:

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

2. To enter the test mode, press the three buttons x , PLAY MODE/TUNING MODE and DISC 2 simultaneously.

3. The destination is displayed.

4. Press DISPLAY buttons simultaneously.

5. The version is displayed.

6. To exit from this mode, press the three buttons x , PLAY MODE/TUNING MODE and DISC 2 simultaneously and press ?/1 button to turn the set OFF.

[CD Service Mode]

•This mode can run the CD sled motor freely. Use this mode, for

instance, when cleaning the pick-up.

Procedure:

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

2. Select the function “CD”.

3. To enter the test mode, press three buttons x , PLAY MODE/ TUNING MODE , and Z simultaneously.

4. The CD service mode is selected.

5. With the CD in stop status, press M button to move the pick-up to outside track, or press m button to inside track.

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

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

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

Note: • Always move the 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.

[MC Test Mode]

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

Procedure:

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

2. To enter the test mode, press the three buttons x , PLAY MODE/TUNING MODE and DISC 3 simultaneously.

3. Press the EQ + button. The function of the equalizer is set to “MAX”.

4. Press the EQ - button. The function of the equalizer is set to “MIN”.

5. Press the PRESET EQ button. The function of the equalizer is set to “EQ FLAT”.

6. MASTER VOLUME up and down. “VOLUME MIN” “VOLUME 16” “VOLUME MAX” is displayed.

7. Press the GROOVE button. The message “VACS OFF” or “VACS ON” is displayed.

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

[CD Ship Mode (LOCK) ]

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

tion. Use this mode when returning the set to the customer after repair.

Procedure:

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

2. Select the function “CD”.

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

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

5. The “STANDBY” display blinks instantaneously, the message “LOCK” is displayed and the CD ship mode is set.

[CD Ship (LOCK) & COLD RESET MODE]

Procedure:

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

2. Select the function “CD”.

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

4. Press three buttons x , CD and DISPLAY simultaneously.

5. The “ST ANDBY” display blinks instantaneously and CD ship

mode is set.

6. To fluorescent indicator tube displays “COLD RESET” and

the set is reset.

[Disc T ray Lock]

Procedure:

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

2. Select the function “CD”.

3. Press two buttons of x and Z simultaneously for five seconds.

4. The message “LOCKED” is displayed and the tray is locked.

(Even if exiting from this mode, the tray is still locked.)

5. Press two buttons of x and Z simultaneously for f ive seconds

again.

6. The message “UNLOCKED” is displayed and the tray is

unlocked.

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

OFF.

HCD-GX450

[CD Repeat 5 Times Limit Release Mode]

Procedure:

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

2. Select the function “CD”.

3. Press three buttons x , CD and ENTER simultaneously.

4. The message “LIMIT OFF” is displayed.

5. Press ?/1 button the set OFF.

[AMP TEST MODE]

Procedure:

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

2. To enter the test mode, press three buttons x , PLAY MODE/TUNING MODE and ENTER simultaneously.

3. Press the DISPLAY button. The message “V0 0 0” “ 000” is displayed.

4. Press the GROOVE button. The message “DBFB ON” “DBFB OFF” is displayed.

5. Press the SURROUND button. The message “SURROUND ON” “SURROUND OFF” is displayed.

6. Press the EQ BAND button. The message “LOW” “MID” “HIGH” is displayed.

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

SECTION 5

DIAGRAMS

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

Note on Schematic Diagram:

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

• All resistors are in Ω and 1/ specified.

•

• C : panel designation.

• A : B+ Line.

• B : B– Line.

• H : adjustment for repair.

•Voltages and waveforms are dc with respect to ground

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

•Waveforms are taken with a oscilloscope.

• Circled numbers refer to waveforms.

• Signal path.

: internal component.

Note:

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

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

tion tolerances. no mark : FM ( ): CD STOP

Voltage variations may be noted due to normal production tolerances.

F : TUNER E : PB (DECK A) d : PB (DECK B) G : REC (DECK B) J : CD f : AUDIO

W or less unless otherwise

Note:

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

Note on Printed Wiring Boards:

• X : parts extracted from the component side.

• b : Pattern from the side which enables seeing.

Caution: Pattern face side: Parts on the pattern face side seen from (SIDE A) the pattern face are indicated. Parts face side: Parts on the parts face side seen from (SIDE B) the parts face are indicated.

• Indication of transistor.

These are omitted.

•Abbreviation CND : Canadian model

HCD-GX450

Circuit Boards Location

SENSOR board

SW board

MOTOR (LD) board

CONNECT board

TRANS board

SUB-TRANS board

BD81A board

MOTOR (TB) board

DRIVER board

SUB-WOOFER boar

AMP board

VIDEO OUT board

• Wavef orms – PANEL BOARD –

IC601 qd (I-XT2)

30.5 s 2 V/DIV, 10 s/DIV

IC601 qh (CF2)

100 ns

2 V/DIV, 40 ns/DIV

5.2 Vp-p

4.9 Vp-p

REM board

PANEL board

MAIN board

6 STREAM LED board

GAME JACK board

H/P JACK board

2121

+ 47 hidden pages