SONY 0999C4231R1, 090084234S1, 0999B4218R1, 090084327R1 Service Manual

HCD-BX7/DX7/DX7J

SERVICE MANUAL

Ver 1.4 2003.12

HCD-BX7/DX7/DX7J is the tuner, deck, CD and amplifier section in MHC-BX7/DX7/DX7J.

Photo: HCD-DX7

SECTION

TAPE DECK

SECTION

Model Name Using Similar Mechanism NEW CD Mechanism Type CDM58-K2BD38 Base Unit Type BU-K2BD38 Optical Pick-up Type KSM-213DAP Model Name Using Similar Mechanism NEW Tape Transport Mechanism Type TCM-230MWR11

US Model

Canadian Model

AEP Model

UK Model

HCD-BX7

E Model

HCD-DX7/DX7J

Australian Model

HCD-DX7

SPECIFICATIONS

— Continued on next page —

9-929-079-15

COMPACT DISC DECK RECEIVER

Sony Corporation

Home Audio Company Published by Sony Engineering Corporaton

SAFETY CHECK-OUT

(US model only)

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 A C leakage. Check leakage as described below.

LEAKAGE

The A C leakag e from any exposed metal part to earth g round 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.

3. Measuring the voltage drop across a resistor by means of a VOM or battery-operated A C voltmeter . The “limit” indication is 0.75 V, so analog meters must ha ve an accur ate 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

0.15µF

1.5kΩ

Earth Ground

AC voltmeter (0.75V)

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

Ver 1.2 2001.08

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.

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.

MODEL IDENTIFICATION

— BACK PANEL —

PARTS No.

TABLE OF CONTENTS

1. SERVICE NOTE ······························································· 4

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

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

4. TEST MODE ···································································· 12

5. MECHANICAL ADJUSTMENTS ····························· 16

6. ELECTRICAL ADJUSTMENTS ······························· 16

7. DIAGRAMS

7-1. Circuit Board Location ····················································· 21 7-2. Block Diagrams ································································ 22 7-3. Printed Wiring Board – BD Section – ······························ 24 7-4. Schematic Diagram – BD Section – ································· 25 7-5. Printed Wiring Board – Main Section – ··························· 26 7-6. Schematic Diagram – Main (1/3) Section – ····················· 27 7-7. Schematic Diagram – Main (2/3) Section – ····················· 28 7-8. Schematic Diagram – Main (3/3) Section – ····················· 29 7-9. Printed Wiring Board – Power AMP Section –

(BX7 model) ····································································· 30

7-10. Schematic Diagram – Power AMP Section –

(BX7 model) ····································································· 31

7-11. Printed Wiring Board – Power AMP Section –

(DX7, DX7J model) ························································· 32

7-12. Schematic Diagram – Power AMP Section –

(DX7, DX7J model) ························································· 33 7-13. Printed Wiring Board – Panel Section –··························· 34 7-14. Schematic Diagram – Panel Section – ····························· 35 7-15. Printed Wiring Board – Leaf SW Section – ···················· 36 7-16. Schematic Diagram – Leaf SW Section – ························ 37 7-17. Printed Wiring Board – Driver Section – ························· 38 7-18. Schematic Diagram – Driver Section – ···························· 39 7-19. Printed Wiring Board – Trans Section –

(BX7 model) ····································································· 40 7-20. Schematic Diagram – Trans Section –

(BX7 model) ····································································· 41 7-21. Printed Wiring Board – Trans Section –

(DX7, DX7J model) ························································· 42 7-22. Schematic Diagram – Trans Section –

(DX7, DX7J model) ························································· 43 7-23. IC Pin Function Description ············································· 44 7-24. IC Block Diagrams ··························································· 46

8. EXPLODED VIEWS

8-1. Main Section····································································· 49 8-2. Panel Section ···································································· 50 8-3. Main Board Section ·························································· 51 8-4. Tape Mechanism Deck Section-1 ····································· 52 8-5. Tape Mechanism Deck Section-2 ····································· 53 8-6. CD Mechanism Section ···················································· 54 8-7. Base unit Section ······························································ 55

9. ELECTRICAL PARTS LIST ······································· 56

MODEL

AED, AEP, CIS, UK, G, AUS, KR, MX, TH models

AR, E, EA, SP, TW, MY models

US, CND models

DX7J model

• Abbreviation

CND : Canadian model AUS : Australian model G : German model EA : Saudi Arabia model MY : Malaysia model SP : Singapore model TH : Thai model

KR : Korea model MX : Mexican model AR : Argentina model E2 : Central and

E3 : Middle and Near East

PARTS No.

4-225-040-1s

4-225-040-2s

4-225-040-3s

4-228-592-3s

South AMERICA

SECTION 1

SERVICE NOTE

Panel board

Note for installing the panel board

Hot melt

Cut the eleven melted-connection points with a cutting plier.

Screw hole

Attach the panel board with six screws ( after the board is removed once. Do not tighten the screws excessively.

+BVTP 2.6 × 8

)

SECTION 2

12345

qdqfqgqh

wh wj

9 q;

GENERAL

1 DISC SKIP EX-CHANGE button 2 DISC 1 button and indicator 3 DISC 2 button and indicator 4 DISC 3 button and indicator 5 Z OPEN/CLOSE button 6 EDIT, TUNER MOMERY button 7 PLAY MODE, STEREO/MONO button 8 REPEAT, DOLBY NR button 9 DIRECTION knob (EXCEPT AEP, G, UK, CIS)

DIRECTION, PTY knob (AEP, G, UK, CIS model)

q; SURROUND button qa VOLUME knob qs PHONES jack qd ENTER button qf REC PAUSE/START button and indicator qg CD SYNC HI-DUB button qh LOOP button (BX7 model)

LOOP, KARAOKE PON button (DX7, DX7J model)

Photo: HCD-BX7

qj MIC jack (DX7, DX7J model) qk MIC LEVEL knob (DX7, DX7J model) ql V-GROOVE button and indicator w; CURSOL button and indicator wa GROOVE button ws EQ EDIT button wd SPECTRUM button wf DISPLAY button wg ?/1 button and indicator wh TUNER/BAND button wj MD (VIDEO) button wk Y button wl > + button e; X button ea – . button es x button ed TAPE A/B button ef CD button eg Function indicator

This section is extracted from instruction manual.

Press ENTER.

The minute indication flashes.

Press . or > repeatedly to set

Press ENTER.

the minute.

The clock starts working.

Tip

If you’ve made a mistake, start over from step 1.

To change the time

The previous explanation shows you how to set the

time while the power is off. To change the time

SET CLOCK.

while the power is on, do the following:

1 Press CLOCK/TIMER SET.

2 Press . or > repeatedly to select

3 Press ENTER.

4 Perform steps 2 through 5 above.

Note

The clock settings are canceled when you disconnect

the power cord or if a power failure occurs.

ou must set the time before using the timer

ime

Step 2: Setting the

he clock is on a 24-hour system for the

uropean model and a 12-hour system for

he 24-hour system model is used for

ther models.

unctions.

llustration purposes.

YX x

3,5

2,4

Press CLOCK/TIMER SET.

The hour indication flashes.

Press . or > repeatedly to set

the hour.

Inserting two size AA (R6)

batteries into the remote

Step 1: Hooking up the system

(continued)

To attach the front speaker pads

Attach the supplied front speaker pads to the

bottom of the speakers to stabilize the

speakers and prevent them from slipping.

Tip

With normal use, the batteries should last for about

six months. When the remote no longer operates

the system, replace both batteries with new ones.

Note

If you do not use the remote for a long period of

time, remove the batteries to avoid possible damage

from battery leakage.

When carrying this system

Do the following to protect the CD

mechanism.

1 Make sure that all discs are removed from

of 45 degrees from your listening

Positioning the speakers

Before you connect them, determine the best

location for your speakers.

1 Place the front speakers at an angle

the unit.

“LOCK” appears in the display.

2 Hold down CD and then press ?/1 so that

3 Unplug the AC power cord.

Front

speaker

(R)

position.

Front

speaker

(L)

Surround

45º

Surround

speaker

(R)

speaker

(L)

Surround

speaker

60 to 90 cm

each other at about 60 to 90 cm

above your listening position.

2 Place the surround speakers facing

SECTION 3

DISASSEMBY

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

3-1. UPPER CASE (TOP)

Upper case (Top)

Two screws (+BVTP 3

10)

Screw (Case)

Two screws (Case)

Side panel L

Two screws

(+BVTP 3

10)

Claw

Side panel R

Two screws

(+BVTP 3

10)

3-2. LOADING PANEL ASSY

CD mechanism deck (CDM58) 1

Turn the pulley to the direction of arrow.

pulley

Front panel side

Pull-out the disc tray.

Loading panel assy

Two screws (Case)

Screw (Case)

)

3-3. FRONT PANEL SECTION

CD mechanism deck (CDM58)

Screw (+BVTP 3

10)

Flat type wire (CN304)

Screw (+BVTP 3

Connector (CN1)

Connector (CN201)

Connector (CN601)

10)

Three screws (+BVTT 3

3-4. TAPE MECHANISM DECK

Connector (CN2)

Front panel section

Bracket (Heart cam L)

Screw (+BVTP 2.6

Five screws (+BVTP 2.6

Connector (CN202)

Screw (+BVTP 2.6

Bracket (Heart cam R)

Tape mechanism deck

)

3-5. PANEL BOARD

Two screws

(+BVTP 2.6

Knob (Volume)

FR knob

Bracket (FR)

Two bosses & four pins

Three claws

Two screws

(+BVTP 2.6

CD Switch boar

VCD Switch board

Panel board

Five claws

Cut the eleven melted-connection points with a cutting plier.

Note: When attching the panel board, refer to "Service Note" on page 4.

3-6. SUB-TRANS BOARD AND TRANS BOARD

Connector (CN975)

Trans board

Connector (CN977)

Two screws (+BVTT 4

8) Trans

Connector (CN974)

Two screws

(+BVTT 4

Panel, back

Two screws

(+BVTP 3

Sub-trans

board

Connector (CN891)

Two screws

(+BVTP 3

Six screws

10)

)

3-7. MAIN BOARD AND AMP BOARD

Three screws (+BVTP 3

Heat sink

Two screws (+BVTP 3

5Power

Two screws (+BVTP 3

AMP board

16)

Connector (CN503)

Connector(CN502)

Main board

Two screws (+BVTP 3

3-8. LEAF SW BOARD, HEAD (A) BOARD AND HEAD (B) BOARD

Five claws

Remove the four solderings.

Head (A) board

Screw (+PS 2.6

Head (B) board

2Leaf

SW board

Screw (+PS 2.6

3-9. BASE UNIT

Two insulators

Base unit

Two insulators

Flat type wire (CN101)

Four screws (+PTPWH 2.6)

3-10. DRIVER BOARD, MOTOR BOARD AND ADDRESS SENSOR BOARD

Tray

Connector (CN701)

Screw (+PTPWH 2.6

Screw (+BVTP 2.6

Driver board

Motor board

Three screws (+BVTP 2.6

Flat type wire (CN721)

Remove the two solderings of motor.

Connector(CN722)

Address Sensor board

Screw (+BVTP 2.6

SECTION 4

TEST MODE

[MC Cold Reset]

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

Procedure:

1. Press three buttons x , ENTER , and ?/1 simulta-neously.

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

the set is reset.

[CD Ship Mode]

• This mode moves the pickup to the position durable to vibration. Use this mode when returning the set to the customer after repair.

Procedure:

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

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

3. After the "STANDBY" display blinks six times, a message

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

[MC Hot Reset]

• This mode resets the set with the preset data kept stored in the memory. The hot reset mode functions same as if the power cord is plugged in and out.

Procedure:

1. Press three buttons x , ENTER , and DISC 1 simultaneously .

2. The fluorescent indicator tube becomes blank instantaneously,

and the set is reset.

[CD Service Mode]

• This mode can run the CD sled motor freely . Use this mode, for instance, when cleaning the pickup.

Procedure:

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

2. Select the function “CD”.

3. Press three buttons x , ENTER , and OPEN/CLOSE simul-

taneously.

4. The CD service mode is selected.

5. With the CD in stop status, turn the shuttle knob clockwise to

move the pickup to outside track, or turn the shuttle knob counter-clockwise to inside track.

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

1) Move the pickup to the most inside track.

2) Press three buttons in the same manner as step 2.

Note: • Always move the pickup 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.

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

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

Procedure:

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

2. Select the function “TUNER”, and press TUNER/BAND

button to select the BAND “MW”.

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

4. Press ENTER and ?/1 buttons simultaneously, and the display

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

[GC Test Mode]

• This mode is used to check the software version, FL tube, LED, keyboard and VACS.

Procedure:

1. Press three buttons x , ENTER , and DISC2 simultaneously .

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

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

press DISC 1 . The model number and destination are displayed.

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

from MC version, GC version, VC version, CD version, CM version, ST version, TC version, TA version, TM version and BR version in this order, and returns to the model number and destination display.

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

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

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

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

“KEY0 VOL0”. Each time a button is pressed, “KEY” value increases. However, once a button is pressed, it is no longer taken into account. “VOL” value increases like 1, 2, 3 ... if rotating VOLUME knob in “+” direction, or it decreases like 0, 9, 8 ... if rotating in “–” direction.

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

tubes, value of VACS appears.

9. T o e xit from this mode, press three b uttons in the same manner

as step 1, or disconnect the power cord.

[VACS ON/OFF Mode]

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

Procedure:

Press the ENTER and SPECTRUM buttons simultaneously. The message “VACS OFF” or “VACS ON” appears.

[MC Test Mode]

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

Procedure:

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

2. Press the three buttons of x , ENTER and DISC 3 simultaneously.

3. A message “TEST MODE” appears on the FL display tube.

4 When f (CURSOR UP) button is pressed, GEQ increases to

its maximum and a message “GEQ ALL MA” appears.

5. When F (CURSOR DOWN) button is pressed, GEQ decreases to its minimum and a message “GEQ ALL M1” appears.

6. When g (CURSOR LEFT) or G (CURSOR RIGHT) button is pressed, GEQ is set to flat and a message “GEQ FLAT” appears.

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

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

9. In the test mode, the default-preset channel is called even when the TUNER is selected and an attempt is made to call the preset channel that has been stored in memory, by oper ating the Shuttle knob. (It means that the memory is cleared.)

10. When CD is selected and the EDIT button is pressed, the disc that is being chucked at this moment becomes the default setting. It means that the default disc only is accessed when any other discs are selected even though the display indication changes accordingly. At the same time, the DISC SKIP EXCHANGE and OPEN/CLOSE cannot be accepted. (It means that the tray motor and the turntable motor are disabled of their operation.)

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

12. When x button is pressed to stop recording, the Tape (Deck) B is selected and tape is rewound using the Shuttle knob, tape is rewound, tape is stops at around the record-starting position and playback of the recorded portion of the tape is started. If P A USE is inserted even once during recording, ta pe is rewound to the position around the P AUSE position and is played back.

13. When the CD SYNC HI-DUB Button is press during playback of Deck B, either normal speed or high speed can be selected by this button.

14. Select the desired loop by pressing the PLAY MODE b utton. Insert a test tape AMS-110A or AMS-RO to Deck A.

15. Press the SPECTRUM button to enter the AMS test mode.

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

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

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

19. When you want to exit this mode, press the ?/1 button twice. The cold reset is enforced at the same time.

[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 display status.

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

1. Operating method of Aging Mode

Turn on the main power and select “CD” of the function.

1) Set a disc in DISC1 tray. Select ALL DISC CONTINUE, and REPEAT OFF.

2) Load the tapes recording use into the decks A and B respectively.

3) Press three buttons x , ENTER , and

DISC SKIP/EX-CHANGE simultaneously.

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

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

3. Aging Mode in CD section

1) Display state

• No error occurs

Display

AGING[*][*][*][*]

Note:

[*][*][*][*]

Error display

E ** s ## $$ %%

12 34 5

1 **

2 s 3 ##

4 $$

5 %%

: Number of aging operations

The error No. 00 indicates the newest error. As the error No. increases, it means the older error. When you want to retrieve the error history, press the PLAY MODE button in the case of mechanism error. Or press the REPEAT button in the case of NO DISC error.

M: Mechanism error Don’t care

High order digits only D: Stopped during closing due to problems other than mechanism. E: Stopped during opening due to problems other than mechanism. C: Stopped during chucking due to problems other than mechanism. F: Stopped during EX-opening due to problems other than mechanism.

Emergency related errors (High order digits only) 1: Stopped during chuck-up 2: Stopped during chuck-down 3: Time out by EX-OPEN 5: Time out by EX-CLOSE

D: No disc error 01: FOCUS ERROR

02: GFS ERROR 03: SETUP ERROR

01: NO DISC judgment without chucking retry 02: NO DISC judgment after chucking retry

Status at the time of NO DISC judgment (High order digits only) 1: STOP 2: SETUP 3: TOC READ 4: ACCESS 5: PLAY BACK 6: PAUSE 7: MANUAL SEARCH (PLAY) 8: MANUAL SEARCH (PAUSE)

• When the buttons x , ENTER and DISC 1 are pressed simultaneously, number of time of the mechanism error and the NO DISC error can be checked. Display: EMC**EDC** **: Number of times of error (Maximum three times)

EMC: Mechanism error EDC: NO DISC error

• When aging operation is complete, be sure to perform the MC Cold Reset to reset the error history.

2) Operation during aging mode In the aging mode, the program is executed in the following sequence. (1) The disc tray opens and closes. (2) The mechanism accesses DISC 2 and makes an attempt to

read TOC. However, since there are no discs, a message “CD2 NO DISC” appears.

(3) The mechanism accesses DISC 3 and a message “CD3 NO

DISC” appears. (4) The disc tray turns to select a disc1. (5) A disc is chucked. (6) TOC of disc is read. (7) The pickup accesses to the track 1, and playing 2 seconds. (8) The pickup accesses to the last track, and playing 2 seconds. (9) Every time when an aging operation of step 1 to step 8 is

complete, the display “ AGING[*][*][*][*]” v alue increases

as the number of aging operations is counted up. (10) Returns to step 1.

3. Aging Mode in Tape Deck section

1) Display state

• No error occurs

Display action now

• Error occurred

Display action last time

NO. Display action Action contents Final timing

1 TAPE A AG-1 Rewind the TAPE A, B The top of tape 2 TAPE A AG-2 FWD play the TAPE A 2 minutes playing 3 TAPE A AG-3 F.F. the TAPE A 20 second FF or the end

4 TAPE A AG-4 REV play the TAPE A 2 minutes playing 5 TAPE A AG-5 Rewind the TAPE A The top of tape 6 TAPE B AG-2 FWD play the TAPE B 2 minutes playing 7 TAPE B AG-3 F.F . the TAPE B 20 second FF or the end

8 TAPE B AG-4 REV play the TAPE B 2 minutes playing 9 TAPE B AG-5 Rewind the TAPE B The top of tape

of tape

2) Operation during aging mode In the aging mode, the program is executed in the following sequence. (1) Rewind is executed up to the top of tape A and B. (2) A tape on FWD side is played for 2 minutes. (3) FF is executed up to either made for 20 second or the end of

tape.

(4) A tape is reversed, and the tape on REV side is played for 2

minutes. (5) Rewind is executed up to the top of tape. (6) Returns to step 2, and repeat steps from 2 to 5.

[Function Change Mode]

* elect either VIDEO or MD of the external FUNCTION input.

Procedure:

1. Turn on the power.

2. Press the two buttons ENTER and ?/1 at the same time.

The main power is turned on and the other function of the previous function is selected and displayed. “MD” or “VIDEO”.

SECTION 5

MECHANICAL ADJUSTMENTS

SECTION 6

ELECTRICAL ADJUSTMENTS

Precaution

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

record/playback heads pinch rollers erase head rubber belts capstan idlers

2. Demagnetize the record/playback head with a head demagnetizer.

3. Do not use a magnetized screwdriver for the adjustments.

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

5. The adjustments should be performed with the rated power supply voltage unless otherwise noted.

Torque Measurement

Mode

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

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

(0.43 – 0.98 oz • inch)

0.19 N • m to 0.58 N • m

2 to 6 g • cm

(0.02 – 0.08 oz • inch)

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

(0.43 – 0.98 oz • inch)

0.19 N • m to 0.58 N • m

2 to 6 g • cm

(0.02 – 0.08 oz • inch)

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

(0.98 – 1.99 oz • inch)

9.80 N • m

100 g or more

(3.53 oz or more)

9.80 N • m

100 g or more

(3.53 oz or more)

DECK SECTION

1. Demagnetize the record/playback head with a head demagnetizer.

2. Do not use a magnetized screwdriver for the adjustments.

3. After the adjustments, apply suitable locking compound to the parts adjust.

4. The adjustments should be performed with the rated power supply voltage unless otherwise noted.

5. The adjustments should be performed in the order given in this service manual. (As a general rule, playback circuit adjustment should be completed before performing recording circuit adjustment.)

6. The adjustments should be performed for both L-CH and RCH.

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

• T est Tape

Tape Signal Used for

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

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

P-4-L300 315 Hz, 0 dB Level Adjustment

Record/Playback Head Azimuth Adjustment

0 dB=0.775 V

DECK A DECK B

Note: Perform this adjustments for both decks

Procedure:

1. Mode: Playback

test tape P-4-A100 (10 kHz, –10 dB)

main board CN301 Pin 3 (L-CH) Pin 1 (R-CH)

set

main board CN301 Pin 2 (GND)

level mete

+ –

2. Turn the adjustment scre w and check output peaks. If the peaks

–

set

test tape P-4-L300 (315 Hz, 0 dB)

main board CN301 (Pin 3 : L-CH)

(Pin 1 : R-CH)

level meter

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

Tape Speed Adjustment

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

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

DECK B

CD SYNC HI-DUB button.

Procedure:

1. Turn the power switch on.

2. Press the x button, ENTER button and DISC 3 button simultaneously. (The “TEST MODE” on the fluorescent indicator tube display while in the test mode.) To exit from the test mode, press the ?/1 button.

Mode: Playback

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

frequency counte

3. Mode: Playback

test tape P-4-A100 (10 kHz, –10 dB)

L-CH

MAIN board CN301 set

R-CH

waveform of oscilloscope

in phase 45° 90° 135° 180°

pin 3

pin 2

L R

pin 1

good

oscilloscop

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).

set

main board CN301 (Pin 3 : L-CH)

(Pin 1 : R-CH)

–

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

2. Press the gG button on the deck B.

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

4. Adjust RV1001 on the LEAF SW board do that frequency counter reads 6,000 ± 30 Hz.

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

6. Adjust RV1002 on the LEAF SW board so that frequency counter reads 3,000 ± 15 Hz.

Adjustment Location: LEAF SW board

Playback level Adjustment

DECK A DECK B

Procedure:

Mode: Playback

forward

reverse

Deck A is RV302 (L-CH) and RV352 (R-CH), Deck B is RV303 (L-CH) and RV353 (R-CH) so that adjustment within adjustment level as follows.

Adjustment Level:

CN301 PB level: 301.5 to 338.3 mV (–8.2 to –7.2 dB) level difference between the channels: within ±0.5 dB

Adjustment Location: MAIN board

Sample Volue of Wow and Flutter: 0.3% or less W. RMS

(WS-48B)

REC Bias Adjustment DECK B

Procedure:

INTRODUCTION When set to the test mode performed in Tape Speed Adjustment, when the tape is rewound after recording, the “REC memory mode” which rewinds only the recorded portion and playback is set. This “REC memory mode” is convenient for performing this adjustment. During recording, the input signal FUNCTION will automatically switch to VIDEO. (If do not operation of stopped from recording complete, and rotette of shuttle knob then rewind to recording start position.)

4. Mode: Record

MD/VIDEO (AUDIO) IN

AF OSC

315 Hz, 50 mV (–23.8 dB)

attenuator

5. Mode: Playback

600 Ω

blank tape CS-123

set

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

MD/VIDEO (AUDIO) IN

1) 315 Hz

2) 10 kHz

AF OSC

attenuator



50 mV (–23.8 dB)

 

600 Ω

blank tap CN-123

set

5. Mode: Playback

recorded portion

set

CN301 (Pin 3 : L-CH)

(Pin 1 : R-CH)

level mete

–

recorded portion

set

level mete

–

CN301 (Pin 3 : L-CH)

(Pin 1 : R-CH)

6. Confirm playback the signal recorded in step 3 become adjustable level as follows. If these levels do not adjustable level, adjustment the RV301 (L-CH) and R V351 (R-CH) on the MAIN board to repeat steps 4 and 5.

Adjustable level:

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

[MAIN BOARD] (Component Side)

T601

RV611

REC LEVEL (L)

(B)

PB LEVEL (L)

(A)

6. Confirm playback the signal recorded in step 3 become adjustable level as follows. If these levels do not adjustable level, adjustment the RV304 (L-CH) and RV354 (R-CH) on the A UDIO board to repeat steps 4 and 5.

Adjustable level: Playback output of 315 Hz to playback output

of 10 kHz: ±1.0 dB

Adjustment Location: MAIN board

REC Level Adjustment

DECK B

Procedure:

INTRODUCTION When set to the test mode performed in Tape Speed Adjustment, when the tape is rewound after recording, the “REC memory mode” which rewinds only the recorded portion and playback is set. This “REC memory mode” is convenient for performing this adjustment. During recording, the input signal FUNCTION will automatically switch to VIDEO. (If do not operation of stopped from recording complete, and rotate of shuttle knob then rewind to 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.

PB LEVEL (R)

(A)

PB LEVEL (R)

(B)

REC LEVEL (R)

(B)

REC LEVEL (L)

(A)

CN301

RV351

PB LEVEL (L)

REC LEVEL (R)

[LEAF SW BOARD] (Component Side)

TAPE SPEED





(NORMAL) (HIGH)

RV1002

RV1001

RV303

(B)

(A)

CN1001

RV302

RV352

RV353

CN304

RV301

CN302

CN303

RV304

RV354

FM Tuned Level Adjustment

FM RF SSG

75 Ω coaxial

Carrier frequency : 98 MHz Modulation : AUDIO 1 kHz, 75 kHz deviation (100%) Output level : 28 dB (at 75 W open)

set

FM ANTENNA terminal (TM601)

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

Procedure:

1. Supply a 28 dB 98 MHz signal from the ANTENN A terminal.

2. Tune the set to 98 MHz.

3. Adjust RV611 to the point (moment) when the TUNED indicator will change from going off to going on.

Adjustment Location: MAIN board

Null Adjustment

FM RF SSG

75 Ω coaxial

set

Carrier frequency : 98 MHz Modulation : AUDIO 1 kHz, 75 kHz deviation (100%) Output level : 60 dB (at 75 W open)

FM ANTENNA terminal (TM601)

Procedure:

1. Supply a 60 dB 98 MHz signal from the ANTENN A terminal.

2. Tune the set to 98 MHz.

3. Measure voltage between pin 21 of IC 601. Adjust T601 ubtil the voltage becomes 0 V.

Oscilloscope

BD board

TP(FEO) TP(VC)

Procedure :

1. Connect oscilloscope to TP (FEO).

2. Connect between TP (FEI) and TP (VC) by lead wire.

3. Connect between TP (AGCCON) and TP (GND) by lead wire.

4. Turn Power switch on.

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

6. Confirm that the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak lev el within 4 ±1 Vp-p.

S-curve waveform

symmetry

within 4 ±1Vp-p

Adjustment Location: MAIN board

Adjustment Location

[MAIN BOARD] Component side

NULL

T601

RV611

FM TUNED LEVEL

CN301

RV351

7. After check, remove the lead wire connected in step 2 and 3.

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

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

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

RF Level Check

oscilloscope

BD board

TP(RF) TP(VC)

Procedure :

CN304

RV301

RV303

RV302

RV352

RV353

CN302

CN303

RV304

RV354

1. Connect oscilloscope to TP (RF).

2. Connect between TP (AGCCON) and TP (GND) by lead wire.

3. Turned Power switch on.

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

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

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

MEMO

SECTION 7

DIAGRAMS

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

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.

• U : B+ Line.

• V : 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.

• Abbreviation

: internal component.

Note:

The components identified by mark ! or dotted line with mark ! 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. Voltage variations may be noted due to normal produc-

tion tolerances.

F : FM f : AM E : PB (DECK A) d : PB (DECK B) G : REC (DECK B) J : CD c : digital out

CND : Canadian model AUS : Australian model G : German model EA : Saudi Arabia model MY : Malaysia model SP : Singapore model TH : Thai model KR : Korea model MX : Mexican model AR : Argentina model E2 : Central and South AMERICA E3 : Middle and Near East

W or less unless otherwise

Note:

Les composants identifiés par une marque ! 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.

• Indication of transistor.

These are omitted.

HCD-BX7/DX7/DX7J

7-1. CIRCUIT BOARD LOCATION

MOTOR Board

SENSOR Board

TRANS Board

CD SWITCH Board

PANEL Board

LEAF SW Board

HEAD (A) Board

HEAD (B) Board

• WA VEFORMS

– BD BOARD –– MAIN BOARD –

IC101 yj

CD PLAY MODE

16.9344MHz

IC101 ta

CD PLAY MODE

6.4Vp-p

CD PLAY MODE

IC101 ra

approx 200mVp-p

IC101 el

DRIVER Board

SUB-TRANS Board

IC401 qa

STOP MODE

32.768kHz

IC401 qd

STOP MODE

BD Board

MAIN Board

POWER AMP Board

TAPE B REC MODE

3.0Vp-p

T301 4

80.7kHz

120Vp-p

400nsec/div

– PANEL BOARD –

IC601 oa

STOP MODE

12.5MHz

2121

1.2Vp-p

4.8Vp-p

approx 170mVp-p

16MHz

3.4Vp-p

HCD-BX7/DX7/DX7J

7-2. BLOCK DIAGRAMS

– TUNER/CD SECTION –

FM 75Ω

TM601

DX7,DX7J MODEL

FE601

AEP,UK,G,CIS MODEL

IF OUT

ANT IN

OSC OUT

US,CND MODEL

FE602

IF OUT

ANT IN

FE603

ANT IN

RB641

F OUT

FM IF

IF OUT

AM/IF

AM OSC

VCO STOP

IF REQ MUTE

AM RF IN

AM OSC

V REG

AM/FM IF MPX

IC601

AM MIX OUT

FM SD ADJ

FM/AM DET

TUNED

STEREO

L OUT

R OUT

18AM IF IN

BUFFER

Q611

R-CH

IFT601

RV611

IC681

XT681

4.332MHz

Q602

RF IF AMP

XIN

XOUT

FM OSC

VT1 IN

VT1

PD1

PLL

IC651

FM/AM IF

AM OSC

2VCO STOP

8IF REQ

6DO

4DI

7IF OUT

8OSC OUT

5VT

122

JR609

1511

US,CND

MODEL

EXCEPT US,CND

R601

CF601 CF602

+B A+12V

R609

X651

4.5MHz

LPF601

LPF

MUX

AEP,UK,G,CIS

MODEL

RDS

IC682

DATA

INT

L-CH

MAIN

SECTION

• RCH is omitted

• Signal Path

: FM

(Page 23)

: CD

: DIGITAL OUT

MASTER CONTROL

IC401(1/2)

RDS DATA

RDS INT

TUNED

STEREO

ST MUTE

ST DIN

ST DOUT

ST CLK

ST CE

OPTICAL PICK-UP

BLOCK

(KSS-213F)

GND

F+

FOCUS

COIL

TRACKING

COIL

F-

T+

T-

+5V

DRIVE

M102 SLED

MOTOR

M101

SPINDLE

MOTOR

Q101

DIGITAL SERVO

DIGITAL SIGNAL PROC.

RF AMP

IC103

IC102

MOTOR/COIL DRIVE

CH1RO

CH1FO

CH2RO

CH2FO

CH3RO

RFO

RFI

CH1RI

CH1FI

CH2RI

CH2FI

CH3RI

22LD ON

21HOLD SW

D/A CONV.

IC101

D OUT

RFAC

RFDC

L OUT

R OUT

SCLK

SCOR

SQSO

SSTP

XTAI

XTAO

R-CH

5DATA

7CLOK

6XLAT

2SQCK

X101

16.9344MHz

XLON

FFDR

FRDR

TFDR

TRDR

SRDR

S101 LIMIT IN SW

IC201

OPTICAL

DIGITAL

OUT

DIITAL OUT

L OUT

MAIN

SECTION

(Page 23)

CD DATA

CD CLK

XLT

SQ CLK

SCOR

SQ DATA

BU UP/DOWN SW

MTR CNT2

T SENS

IC701

45MTR CNT1

46OPEN SW

47CLOSE SW

MOTOR

DRIVE

TBL ADDRESS

IC711

SENSOR

OPEN/CLOSE

S701

S711

BU UP/

DOWN

M721

TURN

MOTOR

CH3FO

CH4RO

24CH3FI

25CH4INS

SFDR

MDP

3XRST

XRST

CH4FO

MUTE

HOLD

+ 50 hidden pages