Sony X-js7 User manual

SERVICE MANUAL

TUNER

FM tuning range 87.5 MHz to 108 MHz

FM usable sensitivity (IHF) 13.2 dBf

FM antenna terminal 75 ohms (unbalanced)

AM tuning range 530 kHz to 1710 kHz (10 kHz step)

531 kHz to 1710 kHz (9 kHz step)

AM usable sensitivity 350 µV/m

AM antenna Loop antenna

AMPLIFIER

Power output 160 W + 160 W (40 Hz - 20 kHz,

THD less than 1 %, 6 ohms)

200 W + 200 W (1 kHz, THD less

than 10 %, 6 ohms)

Total harmonic distortion 0.08 % (100 W, 1 kHz, 6 ohms)

Input VIDEO (MD): 500 mV

Outputs SPEAKERS: 6 ohms or more

PHONES: 32 ohms or more

CASSETTE DECK

Track format 4 tracks, 2 channels stereo

Frequency response 50 Hz – 8 kHz

Recording system AC bias

Heads Deck A: playback x 1

Deck B: recording/playback x 1,

erase x 1

CD PLAYER

Laser Semiconductor laser

(λ= 780 nm)

Emission duration:

continuous

D/A converter 1 bit dual

Signal-to-noise ratio 85 dB (1 kHz, 0 dB)

Harmonic distortion 0.05 % (1 kHz, 0 dB)

GENERAL

Power requirements 120 V AC, 60 Hz

Power consumption 160 W

Power consumption With ECO mode on: 0.25 W

in standby mode With ECO mode off: 25 W

Dimensions (W x H x D) 280 x 328 x 437 mm

(11 1/8x 12 15/16 x 17 7/32 in.)

Weight 10.2 kg (22 lbs 8 oz)

Specifications and external appearance are subject to change

without notice.

Check copyright laws relevant to recordings from discs, tuner

or tape for the country where the unit is to be used.

Licensed by BBE Sound, Inc. under USP4638258, 5510752

and 5736897.

COMPACT DISC DECK RECEIVER

US Model

CX-JS7

Ver. 1.2 2005.05

9-877-265-03 Sony Corporation

2005E05-1 Personal Audio Group

SPECIFICATIONS

CX-JS7 is the tuner, amplifier, cassette deck and

CD player section in JAX-S7.

Model Name Using Similar Mechanism NEW

CD CD Mechanism Type CDM74F-K6BD71A

Section Base Unit Name BU-K6BD71A

Optical Block Name KSM-213DCP

Optical Pick-up Name KSS-213D

Tape deck Model Name Using Similar Mechanism NEW

Section Tape Transport Mechanism Type CWM43FF13

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CX-JS7

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 ra-

diation exposure.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0OR DOTTED

LINE WITH MARK 0ON 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 PUB-

LISHED BY SONY.

SAFETY CHECK-OUT

After correcting the original service problem, perform the follow-

ing safety check before releasing the set to the customer:

Check the antenna terminals, metal trim, “metallized”knobs, screws,

and all other exposed metal parts for AC leakage.

Check leakage as described below.

LEAKAGE TEST

The AC leakage from any exposed metal part to earth ground and

from all exposed metal parts to any exposed metal part having a

return to chassis, must not exceed 0.5 mA (500 microamperes.).

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

1. A commercial leakage tester, such as the Simpson 229 or RCA

WT-540A. Follow the manufacturers’ instructions to use these

instruments.

2. A battery-operated AC milliammeter. The Data Precision 245

digital multimeter is suitable for this job.

3. Measuring the voltagedrop across aresistor by meansof aVOM

or battery-operatedAC voltmeter. The “limit” indication is 0.75

V, so analog meters must have an accurate low-voltage scale.

The Simpson 250 and Sanwa SH-63Trd are examples of a pas-

sive VOM that is suitable. Nearly all battery operated digital

multimeters that have a 2VAC range are suitable. (See Fig.A)

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

1.5 k

Ω

0.15

FAC

voltmete

(0.75 V)

To Exposed Metal

Parts on Set

Earth Ground

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TABLE OF CONTENTS

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

2. GENERAL

Location of Controls ....................................................... 7

3. DISASSEMBLY

3-1. Disassembly Flow ........................................................... 9

3-2. Case (SIDE-L/R)............................................................. 10

3-3. Case (Top) ....................................................................... 10

3-4. Tray Panel........................................................................ 11

3-5. CD Mechanism Deck (CDM74F-K6BD71A)................ 11

3-6. Front Panel Section ......................................................... 12

3-7. Mechanical Deck............................................................. 12

3-8. Rear Cabinet Section ...................................................... 13

3-9. Main Board...................................................................... 13

3-10. Power Board .................................................................... 14

3-11. Transformer Board .......................................................... 14

3-12 Table Assy ....................................................................... 15

3-13. Motor (TB) Board ........................................................... 15

3-14. Motor (LD) Board ........................................................... 16

3-15. Base Unit (BU-K6BD71A)............................................. 16

3-16. Motor Gear Assy (Sled) (M701), BD Board .................. 17

3-17. Optical Pick-up (KSS-213D) .......................................... 17

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

5. ELECTRICAL ADJUSTMENTS

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

6. DIAGRAMS

6-1. Block Diagram – CD Section – ..................................... 22

6-2. Block Diagram – TUNER/TAPE/PANEL Section –..... 23

6-3. Block Diagram –AMP/POWER SUPPLY Section – ... 24

6-4. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 25

6-5. Printed Wiring Board – BD Board – ............................. 26

6-6. Schematic Diagram – BD Board – ................................ 27

6-7. Printed Wiring Boards – CHANGER Section –............ 28

6-8. Schematic Diagram – CHANGER Section – ................ 29

6-9. Schematic Diagram – MAIN Board (1/4) – .................. 30

6-10. Schematic Diagram – MAIN Board (2/4) – .................. 31

6-11. Schematic Diagram – MAIN Board (3/4) – .................. 32

6-12. Schematic Diagram – MAIN Board (4/4) – .................. 33

6-13. Printed Wiring Board – MAIN Board – ........................ 34

6-14. Printed Wiring Board – Power Board –......................... 35

6-15. Schematic Diagram – Power Board (1/2) –................... 36

6-16. Schematic Diagram – Power Board (2/2) –................... 37

6-17. Printed Wiring Boards

– CD BUTTON/HEADPHONE Boards –...................... 38

6-18. Schematic Diagram

– CD BUTTON/HEADPHONE Boards –...................... 39

6-19. Printed Wiring Board – PANEL Board – ...................... 40

6-20. Schematic Diagram – PANEL Board – ......................... 41

6-21. Printed Wiring Board – TRANSFORMER Board – ..... 42

6-22. Schematic Diagram – TRANSFORMER Board – ........ 43

6-23. IC Pin Function Description ........................................... 47

7. EXPLODED VIEWS

7-1. Case Section .................................................................... 53

7-2. Front Panel Section-1...................................................... 54

7-3. Front Panel Section-2...................................................... 55

7-4. Front Panel Section-3...................................................... 56

7-5. Front Panel Section-4...................................................... 57

7-6. Chassis Section-1 ............................................................ 58

7-7. Chassis Section-2 ............................................................ 59

7-8. CD Mechanism Deck Section-1

(CDM74F-K6BD71A) .................................................... 60

7-9. CD Mechanism Deck Section-2

(CDM74F-K6BD71A) .................................................... 61

7-10. CD Mechanism Deck Section-3

(CDM74F-K6BD71A) .................................................... 62

7-11. Base Unit Section (BU-K6BD71A) ............................... 63

8. ELECTRICAL PARTS LIST ............................... 64

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CX-JS7 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 electro-

static 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 emis-

sion, observe from more than 30 cm away from the objective lens.

LASER DIODE AND FOCUS SEARCH OPERATION

CHECK

Carry out the “S curve check” in “CD section adjustment” and

check that the S curve waveforms is output three times.

UNLEADED SOLDER

Boards requiring use of unleaded solder are printed with the lead-

free 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 viscou-s (sticky, less prone to flow)

than ordinary solder so use caution not to let solder bridges oc-

cur 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.

RELEASING THE DISC TRAY LOCK

The disc tray lock function for the antitheft of an demonstration

disc in the store is equipped.

Releasing Procedure :

While pressing the xkey, press the Zkey for 5 seconds. The

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

Note: When “LOCKED” is displayed, the tray lock is not released by

turning power on/off with the [POWER] key.

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HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH TURNS OFF.

Turn the loading gear

in the direction of arrow

Remove the case (side-L).

Pull-out the disc tray.

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SERVICE POSITION

– CD mechanism deck –

–Tape mechanism deck –

main board (CN312)

Connect wire (flat type) (19 core) to

main board (CN312) and BD board (CN710).

BD board (CN710)

Connect wire (flat type) (13 core) to

panel board (CN601) and mechanical deck.

panel board (CN601)

main board (CN203)

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SECTION 2

GENERAL This section is extracted from

instruction manual.

•LOCATION OF CONTROLS

1DISC CHANGE/DISC SKIP

Rotates the CD trays.

2POWER 6STANDBY/ON

Switches the unit on and off (standby).

The red indicator flashes when receiving a signal from

the remote.

3TAPE A/B

Selects Tape function, and deck A or B.

TUNER BAND

Selects Tuner function and the radio band.

VIDEO (MD)

Selects the function of external equipment connected to

VIDEO (MD) jacks.

Selects CD function.

4TREBLE/MIDDLE

Enhances high or middle frequency sound.

5CD SYNC

Starts Automatic CD dubbing.

REC PAUSE/START

Starts recording.

6PHONES jack

Plug in here an optional headphones set with a mini

stereo plug (ø3.5 mm). Speaker output is canceled.

Main unit: front

Refer to the pages indicated in parentheses for details.

7DISC DIRECT PLAY 1-3

Selects a disc.

8zOPEN/CLOSE

Opens or closes the disc compartment.

9HEAVY, VOCAL, SALSA, TECHNO,

HIP HOP, MANUAL

Activates a graphic equalization curve.

0MODE

Selects various modes (Play mode, etc.) when used in

combination with ENTER and MULTI JOG.

ENTER

Fixes the modes and the time (Play mode, etc.) when

used in combination with MODE and MULTI JOG.

!MULTI JOG

CD: skips to a previous or a succeeding track.

Tuner: selects a preset station.

Clock and Timer: sets the time.

Selects the mode and the time when used in combination

with MODE and ENTER.

@VOLUME

Adjusts the volume.

#BASS

Adjusts low frequency sound.

SURROUND

Switches surround on and off.

i-Bass

Produces rich and clear low frequency sound.

$DISPLAY

Displays the time and the remaining time for CD.

When the unit is off, press DISPLAY to switch between

DEMO, Clock and ECO display modes.

ALBUM k/i

Selects a previous album or a succeeding album with

MP3-CDs.

%rTUNING DOWN, tTUNING UP

(f,g)

CD: searches a track in fast forward or fast reverse

playback when held down.

Tape: fast forwards or rewinds the tape.

Tuner: manually tunes down or up within the band.

aPAUSE

CD and Tapes: pauses playback.

CD and Tapes: starts playback.

sSTOP

CD and Tapes: stops playback.

Main unit: rear

Refer to the pages indicated in parentheses for details.

1AM LOOP, FM 75 Ωterminals

Plug in the supplied AM and FM antennas here.

2VIDEO (MD) jacks

Accepts analog sound signals from external equipment.

Connect using an optional connecting cable with RCA

phono plugs (red plug to R jack, white plug to L jack).

Refer also to the operating instructions of your equipment.

To switch function to external input, press VIDEO (MD).

Tip:

To change the displayed name for this function, turn the

unit on, then hold down VIDEO (MD) and press POWER

on the unit. Repeat the procedure to select “VIDEO” or

“MD”.

3SPEAKER terminals

Connect the speaker cord of the supplied front speakers

here.

4AC power cord

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Buttons with the same or similar names with the main unit

basically have the same function.

1POWER

21-0/10, +10

Selects a CD track of the specified number.

The numbered buttons take on these functions below when pressed

together with SHIFT held down

EDIT

Enters Automatic CD dubbing mode when pressed in

stop mode.

BAND

Selects Tuner function and the radio band.

TAPE A/B

Selects Tape function, and deck A or B.

SPECTRUM

Changes the spectrum analyzer display.

TUNER MODE

Switches between stereo or monaural FM reception.

GEQ

Enters Graphic Equalizer setting mode.

TUNER MEMORY

Tuner: stores the received station in to preset.

SURROUND

Switches surround on and off.

3r,t

CD: selects a track.

Tuner: selects a preset station.

BASS, MID and TREBLE: adjusts the level.

Clock and Timer: sets the time.

4ALBUM M/N

Selects a previous album or a succeeding album.

5PLAY MODE

CD: selects a playback mode.

Tape: selects a playback mode

REPEAT

Enters CD repeat playback mode.

ENTER

6CLOCK/TIMER/SET

Enters timer setting mode.

CLOCK/TIMER/SELECT

Selects timer playback, timer recording or timer off.

7DISPLAY

Displays the time and the remaining time for CD.

When the unit is off, press DISPLAY to switch between

DEMO, Clock and ECO display modes.

8SHIFT

Hold down when pressing a numbered button to change

its function to that printed above the number.

e.g.)

“Press SHIFT+BAND on the remote” indicates “Hold

down SHIFT and press ‘2’ (BAND)”. Doing so makes you

be able to select Tuner function and the radio band.

Remote control

Refer to the pages indicated in parentheses for details.

9FUNCTION

Switches the active function among CD, TAPE, TUNER

and VIDEO (MD).

0DISC SKIP

Select a disc.

!c/d

CD and Tape: starts playback.

CD and Tape: stops playback.

f,g

CD: searches a track in fast forward or fast reverse

playback when held down.

Tape: fast forwards or rewinds the tape.

Tuner: manually tunes down or up within the band.

CD and Tape: pauses playback.

@SLEEP

Switches the sleep-timer on/off and selects the duration.

#VOLUME (+,-)

Adjusts the volume.

$SOUND

Selects BASS, MID or TREBLE setting mode

CLEAR

Clears a track of the CD programed playback.

Note

The buttons not explained above (KARAOKE) do not

operate for this unit.

Setting the clock

Use the remote.

Press CLOCK/TIMER/SET.

Go to step3 when the time appears and the ‘hour’ flashes.

Press ror trepeatedly until “CLOCK ”

appears in the display and then press ENTER.

Press ror trepeatedly to set the hour

and then press ENTER.

Press ror trepeatedly to set the minute

and then press ENTER.

Thetime display stops flashing and the clock starts from

00 seconds.

•MULTI JOG is also available in place of r

or t.

To d i splay the time

Press DISPLAY.The time will be displayed for 6 seconds.

Tip:

“AM 12:00” indicates midnight and “ PM

12:00” noon.

If “- -:- -” appears when the unit is turned off

There has been a power interruption. Re-set the clock.

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

3-1. DISASSEMBLY FLOW

SECTION 3

DISASSEMBLY

Set

3-2. CASE

(SIDE-L/R)

(Page 10)

3-3. CASE (TOP)

(Page 10) 3-4. TRAY PANEL

(Page 11)

3-6. FRONT PANEL

SECTION

(Page 12)

3-8. REAR CABINET

SECTION

(Page 13)

3-7. MECHANICAL

DECK

(Page 12)

3-9. MAIN BOARD

(Page 13)

3-10. POWER

BOARD

(Page 14)

3-11. TRANSFORMER BOARD

(Page 14)

3-16. MOTOR GEAR ASSY (SLED) (M701),

BD BOARD

(Page 17)

3-17. OPTICAL PICK-UP

(KSS-213D)

(Page 17)

3-15. BASE UNIT

(BU-K6BD71A)

(Page 16)

3-12. TABLE ASSY

(Page 15)

3-13. MOTOR (TB)

BOARD

(Page 15)

3-14. MOTOR (LD)

BOARD

(Page 16)

3-5. CD MECHANISM DECK

(CDM74F-K6BD71A)

(Page 11)

Note 1: The process described in can be performed in any order.

Note 2: Without completing the process described in , the next process can not be performed.

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two screws

(BVTP3

10)

case (top)

claw

two screws

(BVTP3

10)

two screws

(BVTP3

10)

three screws

(case3 TP2)

case (side-R)

three screws

(case3 TP2)

case (side-L)

3-3. CASE (TOP)

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

3-2. CASE (SIDE-L/R)

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