Sony CXJS-7, CXJS-7 Service manual

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)

CX-JS7

SERVICE MANUAL

Ver. 1.2 2005.05

CX-JS7 is the tuner, amplifier , cassette dec k and CD player section in JAX-S7.

Model Name Using Similar Mechanism NEW

CD Section

Tape deck Section

CD Mechanism Type CDM74F-K6BD71A Base Unit Name BU-K6BD71A Optical Block Name KSM-213DCP Optical Pick-up Name KSS-213D Model Name Using Similar Mechanism NEW Tape Transport Mechanism Type CWM43FF13

US Model

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

SPECIFICATIONS

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

Weight 10.2 kg (22 lbs 8 oz)

Specifications and external appearance are subject to change without notice.

(11

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

COMPACT DISC DECK RECEIVER

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.

9-877-265-03 Sony Corporation

CX-JS7

Notes on chip component replacement

•Never reuse a disconnected chip component.

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

Flexible Circuit Board Repairing

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

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

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

SAFETY CHECK-OUT

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

LEAKAGE TEST

The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microamperes.). Leakage current can be measured by any one of three methods.

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

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

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

digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a V OM

or battery-operated A C voltmeter . The “limit” indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2 V AC range are suitable. (See Fig. A)

CAUTION

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

To Exposed Metal Parts on Set

1.5 k

0.15 µF

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

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

Ω

Earth Ground

voltmete (0.75 V)

CX-JS7

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. Fr ont 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

7. EXPLODED VIEWS

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

7-2. F ront Panel Section-1 ...................................................... 54

7-3. F ront Panel Section-2 ...................................................... 55

7-4. F ront Panel Section-3 ...................................................... 56

7-5. F ront 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

6. DIAGRAMS

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

6-2. Block Diagr am – 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

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 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.

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 viscou-s (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.

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 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.

x key, press the Z key for 5 seconds. The

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

Remove the case (side-L).

Turn the loading gear in the direction of arrow A.

Pull-out the disc tray.

CX-JS7

SERVICE POSITION – CD mechanism deck –

main board (CN312)

– Tape mechanism deck –

BD board (CN710)

panel board (CN601)

Connect wire (flat type) (19 core) to main board (CN312) and BD board (CN710).

Connect wire (flat type) (13 core) to panel board (CN601) and mechanical deck.

main board (CN203)

• LOCATION OF CONTROLS

# 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.

% r TUNING 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.

SECTION 2

GENERAL

CX-JS7

This section is extracted from instruction manual.

Main unit: front

Refer to the pages indicated in parentheses for details.

1 DISC CHANGE/DISC SKIP

Rotates the CD trays.

2 POWER 6STANDBY/ON

Switches the unit on and off (standby). The red indicator flashes when receiving a signal from the remote.

3 TAPE 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.

4 TREBLE/MIDDLE

Enhances high or middle frequency sound.

5 CD SYNC

Starts Automatic CD dubbing.

REC PAUSE/START

Starts recording.

6 PHONES jack

Plug in here an optional headphones set with a mini stereo plug (ø3.5 mm). Speaker output is canceled.

7 DISC DIRECT PLAY 1-3

Selects a disc.

8 zOPEN/CLOSE

Opens or closes the disc compartment.

9 HEAVY, VOCAL, SALSA, TECHNO,

HIP HOP, MANUAL

Activates a graphic equalization curve.

0 MODE

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.

Main unit: rear

Refer to the pages indicated in parentheses for details.

1 AM LOOP, FM 75 Ω terminals

Plug in the supplied AM and FM antennas here.

2 VIDEO (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”.

3 SPEAKER terminals

Connect the speaker cord of the supplied front speakers here.

4 AC power cord

CX-JS7

Remote control

Refer to the pages indicated in parentheses for details.

Buttons with the same or similar names with the main unit basically have the same function.

1 POWER 2 1-0/10, +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.

3 r, t

CD: selects a track. Tuner: selects a preset station. BASS, MID and TREBLE: adjusts the level. Clock and Timer: sets the time.

4 ALBUM M/N

Selects a previous album or a succeeding album.

5 PLAY MODE

CD: selects a playback mode. Tape: selects a playback mode

REPEAT

Enters CD repeat playback mode.

ENTER

6 CLOCK/TIMER/SET

Enters timer setting mode.

CLOCK/TIMER/SELECT

Selects timer playback, timer recording or timer off.

7 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.

8 SHIFT

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.

9 FUNCTION

Switches the active function among CD, TAPE, TUNER and VIDEO (MD).

0 DISC 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 step 3 when the time appears and the ‘hour’ flashes.

Press r or t repeatedly until “ CLOCK ” appears in the display and then press ENTER.

Press r or t repeatedly to set the hour and then press ENTER.

Press r or t repeatedly to set and then press ENTER.

The time display stops flashing and the clock starts from 00 seconds.

•MULTI JOG is also available in place of r or t.

To di splay the time

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

Tip:

“AM 12:00” indicates midnight and “ PM

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

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

the

12:00

minute

” noon.

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

3-1. DISASSEMBLY FLOW

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.

Set

3-2. CASE

(SIDE-L/R) (Page 10)

CX-JS7

SECTION 3

DISASSEMBLY

3-3. CASE (TOP)

(Page 10)

3-5. CD MECHANISM DECK

(CDM74F-K6BD71A) (Page 11)

3-6. FRONT PANEL

SECTION (Page 12)

3-7. MECHANICAL

DECK (Page 12)

3-4. TRAY PANEL

3-8. REAR CABINET

3-9. MAIN BOARD

(Page 11)

SECTION (Page 13)

(Page 13)

3-12. TABLE ASSY

(Page 15)

3-13. MOTOR (TB)

BOARD (Page 15)

3-14. MOTOR (LD)

BOARD (Page 16)

3-10. POWER

BOARD (Page 14)

3-15. BASE UNIT

(BU-K6BD71A) (Page 16)

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

BD BOARD (Page 17)

3-17. OPTICAL PICK-UP

(KSS-213D) (Page 17)

3-11. TRANSFORMER BOARD

(Page 14)

CX-JS7

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

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

three screws (case3 TP2)

case (side-L)

two screws (BVTP3 × 10)

case (side-R)

3-3. CASE (TOP)

claw

case (top)

three screws (case3 TP2)

two screws (BVTP3

10)

claw

3-4. TRAY PANEL

Turn the loading gear in the direction of arrow A.

Pull-out the disc table.

CX-JS7

four claws

tray panel

3-5. CD MECHANISM DECK (CDM74F-K6BD71A)

CD mechanism deck (CDM74F-K6BD71A)

wire (flat type) (19 core) (CN312)

two screws (BVTP3

connector (CN701)

10)

screw (BVTP3 × 10)

CX-JS7

)

3-6. FRONT PANEL SECTION

wire (flat type) (9 core) (CN311)

connector (CN202)

connector (CN203)

front panel section

3-7. MECHANICAL DECK

three screws (BVTP3

mechanical deck

10)

wire (flat type) (31 core) (CN304)

wire (flat type) (13core)

connector (CN310)

six screws (BVTP3

ground mechanical plate

3-8. REAR CABINET SECTION

)

cover (duct)

wire (flat type) (11core)

two screws (BVTP3 × 10)

five screws (BVTP3 × 10)

CX-JS7

3-9. MAIN BOARD

rear cabinet section

connector (CN303)

main board

two connectors (CN502, CN503

two screws (BVTP3

10)

CX-JS7

3-10. POWER BOARD

connector (CN902)

two screws (BVIT3B+3-8R)

power board

3-11. TRANSFORMER BOARD

screw (BVTP3

10)

transformer board

four screws (ITC+4-10R)

screw (BVTT3

trans holder

3-12. TABLE ASSY

)

two claws

CX-JS7

Ver. 1.2

Pull-out the table assy.

table assy

3-13. MOTOR (TB) BOARD

screw (PTPWH M2.6)

tray

Turn the loading gear in the direction of arrow

belt (table)

hook

wire (flat type) (5 core (CN702)

connector (CN731)

motor (TB) boar

two screws (BTTP M2.6)

CX-JS7

3-14. MOTOR (LD) BOARD

motor (LD) board

two screws (BTTP M2.6)

3-15. BASE UNIT (BU-K6BD71A)

belt (loading)

connector (CN704)

four insulators

four stoppers (BU)

four coil springs (insulator)

four screws (BTTP M2.6)

base unit (BU-K6BD71A)

)

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

gear (A)

claw

two screws

(P2

BD board

Remove two solders.

gear (B)

wire (flat type) (16 core (CN708)

motor gear assy (SLED) (M701)

CX-JS7

3-17. OPTICAL PICK-UP (KSS-213D)

Remove two solders.

screw (P2.6 × 6)

Remove the optical pick-up (KSS-213D) in the direction of arrow

sled shaft

Slide the lever in the direction of arrow

CX-JS7

SECTION 4

TEST MODE

[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 the [POWER] key to turn the power ON.

2. Press three keys of x , [ENTER] and [POWER] simultaneously.

3. The message “RESET” is displayed on the fluorescent indicator

tube momentarily, then becomes standby states.

[TUNER STEP CHANGE-OVER]

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

Procedure:

1. Press the [POWER] key to turn the power ON.

2. Press the [TUNER BAND] key to select “AM”.

3. Press the [POWER] key to turn the power OFF.

4. Press two keys of [ENTER] and [POWER] simultaneously.

5. The message “9K STEP” or “10K STEP” is displayed on the

fluorescent indicator tube, and thus the channel step is changed over.

[CD SHIP MODE]

• 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 the [POWER] key to turn the power ON.

2. Press the [CD] key to select “CD”.

3. Press two keys of [CD] and [POWER] simultaneously.

4. The message “LOCK” is displayed on the fluorescent indicator

tube, and the CD ship mode is set.

[CHANGE-OVER FUNCTION OF MD/VIDEO]

• This mode is used to enable function of external input to change over between MD and VIDEO.

Procedure:

1. Set to standby state.

2. Press two keys of [MD VIDEO ]

3. The message “MD” or “VIDEO”is displayed on the fluorescent

indicator tube, and the function of external input is changed over.

)(

and [POWER] simultaneously.

[CD TRAY LOCK MODE]

• This mode is used to unable to take sample disc out of tray in the shop.

Procedure:

1. Press the [POWER] key to turn the power ON.

2. Press the [CD] key to select “CD”.

3. While pressing the x key, press the Z key for 5 seconds.

4. The message “LOCKED” is displayed on the fluorescent

indicator tube and the tray is locked. (Even if pressing the Z key, the message “LOCKED” is displayed on the fluorescent indicator tube and the tray is locked)

5. To release from this mode, while pressing the x key, press

the Z key for 5 seconds.

6. The message “UNLOCKED” is displayed on the fluorescent

indicator tube and the tray is unlocked.

[AMP TEST MODE]

• This mode is used to set the parameter of AMP IC and EQ band level and i-bass IC.

Procedure:

1. Press the [POWER] key to turn the power ON.

2. Press three keys of x , [HIP HOP] and [HEAVY] simultaneously.

3. When the AMP test mode is activated, the message “AMP

TEST” is displayed on the fluorescent indicator tube momentarily.

4. Press two keys of [HEAVY] and [DISC DIRECT PLAY 2]

simultaneously, mode is changed over to parameter setting of AMP IC and EQ band level and i-bass IC.

5. In the AMP IC setting mode, press the [ENTER] key, surround

ON/OFF is changed over.

6. In the EQ band level setting mode, press the [MANUAL] key,

EQ band is changed over to LOW, MID or HIGH.

7. In the i-bass IC setting mode, turn the

i-bass level, press the [i-BASS] key, i-bass f0 level is change over between 1 to 3.

8. To r elease from this mode, press two keys of [HEAVY] and

[BASS] knob, up/down

[TECHNO] simultaneously.

CX-JS7

[AGING MODE]

• This mode can be used for operation check of CD section and tape deck section. CD section and tape deck section work in parallel.

If an error occurred:

The aging operation stops only an error occurred sections and display then status.

If no error occurs:

The aging operation continues repeatedly.

Procedure:

1. Press the [POWER] key to turn the power ON.

2. Press the [CD] key to select “CD”.

3. Set disc on the tray and set tape into the deck.

4. Set the “ALL DISCS” mode and “REV OFF” mode.

5. Press three keys of x , [HEAVY] and [DISC CHANGE/DISC SKIP]

simultaneously.

6. The message “AGING” is displayed on the fluorescent indicator

tube momentarily, then aging operations of CD and tape are started at the same time.

7. To release from this mode, operate the “COLD RESET”.

1. Display at the Aging Mode

Display operating state of CD section and tape deck section alternately. If an error occurred, stop display which that section.

2. CD Section

The sequence during the aging mode is following as below. Display at the aging mode is the same as the normal operation.

Aging mode sequence (CD section) :

3. Tape Deck Section

The sequence during the aging mode is following as below. If an error occurred, stop display that step.

Aging mode sequence (tape deck section) :

Rewind the tape A and B

“AAG-1 or 2”

Shut off

FWD play the tape A

“AAG-3”

2 minutes

Fast forward the tape A

“AAG-4”

Shut off or 20 seconds

REV play the tape A

“AAG-5”

2 minutes

Rewind the tape A

“AAG-6”

Shut off

FWD play the tape B

“BAG-3”

Start (from disc 1)

Disc chucking

TOC read

Play first track for 2 seconds

Play last track for 2 seconds

EX-change open/close

Open the disc tray

Disc skip

Close the tray

Change the next disc.

2 minutes

Fast forward the tape B

“BAG-4”

Shut off or 20 seconds

REV play the tape B

“BAG-5”

2 minutes

Rewind the tape B

“BAG-6”

Shut off

Note: “*AG-*” is display of each step.

CX-JS7

[GC TEST MODE]

• This mode is used to check the fluorescent indicator tube, LED and key.

Procedure:

1. Press the [POWER] key to turn the power ON.

2. Press three keys of x , [HEAVY] and [DISC DIRECT PLAY 2]

simultaneously.

3. Fluorescent indicator tube and LEDs are all turned ON.

4. Press two keys of [HEAVY] and [DISC DIRECT PLAY 2]

simultaneously, mode is changed over.

5. In the key check mode, press each key, the defined key number

of every each key list is displayed on the fluorescent indicator tube.

6. In the key count check mode, “K-CNT 0” is displayed on the

fluorescent indicator tube. Each time a key is pressed, “K” value increases. However, once a key is pressed, it is no longer taken into account.

7. In the headphone input check mode, connect the headphone,

the message “H_P ON” is displayed on the fluorescent indicator tube, and disconnect the headphone, the message “H_P OFF” is displayed on the fluorescent indicator tube.

8. In the volume check mode, turn the [VOLUME] knob, the

display on the fluorescent indicator tube is changed over to “VOL UP”, “VOL FLAT” or “VOL DOWN”

[MC TEST MODE]

• This mode is used to check operations of Amplifier.

Procedure:

1. Press the [POWER] key to turn the power ON.

2. Press three keys of x , [HEAVY] and [DISC DIRECT PLAY 3]

simultaneously.

3. When the MC test mode is activated, the message “MC MODE”

is displayed on the fluorescent indicator tube momentarily, then VACS level is displayed on the fluorescent indicator tube.

4. Press the

indicator tube is changed over to “EQ MAX”, press the

[TECHNO] key, the display on the fluorescent

[MANUAL] key, the display on the fluorescent indicator tube

is changed over to “EQ MID”, press the [HIP HOP] key, the display on the fluorescent indicator tube is changed over to “EQ MIN”,

5. Turn the [VOLUME] knob, the displa y on the fluorescent

indicator tube is changed over to “VOL MAX”, “VOL MID” or “VOL MIN”

6. When the [REC PAUSE/START] key is pressed with a tape

set in the deck-B, the function is switched “MD” or “VIDEO” and recording starts. When the m or M key is pressed during recording, the tape is rewound back to the beginning of recording, the function is switched to “T APE B”, then playback starts.

7. When the [CD SYNC] key is pr essed with the test tape (AMS-

100, AMS-110A) in the deck, number of space between tunes is counted, then if AMS-110A is set, “OK” is displayed on the fluorescent indicator tube and if AMS-100 is set, “NG” is displayed on the fluorescent indicator tube.

8. To release from this mode , press the [POWER] key.

[MODEL, DESTINATION AND VERSION DISPLAY]

• This mode is used to check the model, destination and software version.

Procedure:

1. Set to the standby state.

2. Press three keys of x , [TECHNO] and [HEAVY] simultaneously.

3. When the model, destination and version display mode is

activated, the model an destination is displayed on the fluorescent indicator tube.

4. Press two keys of [HEAVY] and [DISC DIRECT PLAY 2]

simultaneously, mode is changed over to model and destination display mode and version display mode.

5. In the version display mode, press the [DISC DIRECT PLAY 3]

key, display is changed over to version display and year, month and day of the software creation display.

6. To release from this mode, press the two keys of [TECHNO]

and [HEAVY] simultaneously.

[CD SERVICE MODE]

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

Procedure:

1. Press the [POWER] key to turn the power ON.

2. Press the [CD] key to select “CD”.

3. Press three keys of x , [HEAVY] and Z simultaneously.

4. When the CD service mode is activated, the message “TRVS

ON” is displayed on the fluorescent indicator tube.

5. Press the M key, optical pick-up move to outside track and

the message “SLED OUT” is displayed on the fluorescent indicator tube.

6. Press the m key, optical pick-up move to inside track and

the message “SLED IN” is displayed on the fluorescent indicator tube..

7. Press the

[TECHNO] key, traverse ON/OFF is changed over.

[5 REPEAT LIMIT CANCEL]

• Number of repeat for CD playback is 5 times when the repeat mode is “REPEAT”. This mode is used to enables CD to repeat playback for limitless times.

Procedure:

1. Press the [POWER] key to turn the power ON.

2. Press the [CD] key to select “CD”.

3. Press three keys of x , [HEAVY] and Y simultaneously.

SECTION 5

ELECTRICAL ADJUSTMENTS

CX-JS7

CD SECTION

Note:

1. CD Block is basically designed to operate without adjustment. Therefore, check each item in order given.

2. Use YEDS-18 (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

Oscilloscope

BD board

TP(FE) TP(VC)

Procedure :

1. Connect an oscilloscope to TP (FE) and TP (VC).

2. Turn the power on.

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

4. Confirm that the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 3 ± 0.5 Vp-p.

Note: Clear RF signal waveform means that the shape “ ◊ ” can be clearly

distinguished at the center of the waveform.

RF signal waveform

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

level : 1.3

0.3Vp-

Connecting Location: BD board

– BD Board (Conductor side) –

S-curve waveform

symmetry

within 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.

0.5Vp-

RF LEVEL CHECK

BD board

TP(RF) TP(VC)

Procedure :

1. Connect an oscilloscope to TP (RF) and TP (VC).

2. Turn the power on.

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

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

oscilloscope

TP (VC)

TP (RF)

TP (FE)

IC721

2121

CX-JS7

SECTION 6

DIAGRAMS

6-1. BLOCK DIAGRAM – CD Section –

DETECTOR

LASER DIODE

I-V AMP

AUTOMATIC

POWER CONTROL

Q701

RF AMP, FOCUS/TRACKING ERROR AMP,

DIGITAL SIGNAL PROCESSOR, DIGIRAL SERVO PROCESSOR,

FIN2

PH, BH

A/D

CONVERTER

SERVO

PROCESSOR

D/A

CONVERTER

APC

TBAL

EQ, AGC

RF AMP

FIN1

TIN1

TIN2

LDD

LDS

EFMIN

DIGITAL FILTER, D/A CONVERTER

ERROR

CORRECT

IC721

D/A

CONVERTER

EXTERNAL

AUDIO IN

SERIAL OUT

CLOCK

GENERATOR

LCHO

RCHO

ASDFIN ASDACK ASLRCK

DATA

DATACK

LRSY

EFLG

C2F

FSX/16MIN

16MOUT

XIN

XOUT

57 56 55

60 59 58

53 52 50

26MP3RES

16.9344MHz

X701

R-CH

2 ADDATA 3 ADBCK 4 ADLRCK

79 DATAIN 80 DATACK

1 LRSY

5 C2FIN 9 CKOUT

78 RESB

7 CKIN

73 CMDOUT 74 CMDIN 75 CL

MP3 DECODER

IC801

76 66

MDATA0

– MDATA15

MADRS0

– MADRS8

FSYNC

• R-ch is omitted due to same as L-ch.

• SIGNAL PATH

: CD PLAY

IC802

MEMORY

2-5, 7-10,

I/01 – I/016

23-30, 33-4060-53, 50

31-34, 36-39

A0 – A8

16-19, 22-26

27 OE45OEB 13 WE42WEB 14 RAS41RASB 29 LCAS43CASLB 28 UCAS44CASUB

MUTING

Q311

R-CH

MUTING CONTROL

SWITCH

Q312

CD-L

(Page 24)

OPTICAL PICK-UP

BLOCK

(KSM-213DCP)

2-AXIS

DEVICE

(FOCUS)

(TRACKING)

S701

(LIMIT)

FOCUS/TRACKING COIL DRIVE,

SPINDLE/SLED MOTOR DRIVE

IC722

VO3(+)

18 17 VO3(–)

11 VO2(+) 12 VO2(–)

FOIN

20TIN

70 LIMIT SW

TDO

FDO23SLDO22SPDO25CONT4

COMMAND INTERFACE

*WRQ

72CD MUTE

106

61 65

67DRF 66*RES

99 I-LC78646/LC78684 DI 98 O-LC78646/LC78684 DO

100 O-LC78646/LC78684 CLK

5O-LC78646 CE

85 I-WRQ

86 I-CD DRF

4O-LC78646 RESET

SYSTEM CONTROLLER

IC901 (1/2)

M751

(LOADING)

O-LC78684 CE

I-LC78684 SYNC

I-BU IP DOWN/

CD OPEN CLOSE

LOADING MOTOR DRIVE

IC701

4 OUT1

2 OUT2

1O-SYS-MUTE 94O-POWER RELAY 29I-HOLD

11RESET 27I-POWER DOWN

96I-CD NUMBER SENS

7FIN

9RIN

S-MUTE

O-POWER

HOLD

RESET

POWER DOWN

LEVEL SHIFT

Q731

LM-F

LM-R

OPEN

ROTARY

ENCODER

S711

TABLE ADDRESS

S-MUTE,

O-POWER, HOLD

POWER DOWN

SENSOR

IC731

DISC TRAY

ADDRESS DETECT

S751

OPEN/CLOSE

DETECT

LM-F, LM-R,

TM-F, TM-R

RESET,

(Page 24)

(Page 23)

M701

(SLED)

M702

(SPINDLE)

26 VO4(+)

27 VO4(–)

2 VO1(+)

1 VO1(–)

25SLIN

M741

(TABLE)

3SPIN

7LDS

TABLE MOTOR DRIVE

IC712

4 OUT1

2 OUT2

TM-F

7FIN

TM-R

9RIN

2222

6-2. BLOCK DIAGRAM – TUNER/TAPE/PANEL Section –

CX-JS7

L-CH

HP1 (PB)

(DECK-A)

HRPE1

(REC/PB/ERASE)

(DECK-B)

FM 75Ω

(COAXIAL)

AM LOOP

(Page 24)

R-CH R-CH

L-CH

R-CH R-CH

ERASE

ANTENNA

• R-ch is omitted due to same as L-ch.

• SIGNAL PATH

: TUNER (FM/AM)

: TAPE PLAY (DECK-A)

: TAPE PLAY (DECK-B)

: REC

R-CH

TUNER UNIT

FM ANT

AM ANT

MUTING

Q219, 221

L-CH

R-CH R-CH

CLK

TUNED

TU-MUTE

SPEANA AMP

Q201, 202

(FRONT PANEL KEY)

+3.3V (SUB)

VOLUME

BASS

MULTI JOG

TREBLE MIDDLE

S301 – 309,

S311 – 331

REC ON/OFF

SWITCH

Q222, 225

BAND-PASS

FILTER

Q204 – 206

REMOTE CONTROL

RECEIVER

IC802

ROTARY

ENCODER

S801

ROTARY

ENCODER

S802

ROTARY

ENCODER

S803

ROTARY

ENCODER

S804

KEY ACTIVE

SWITCH

Q504, 505

BIAS OSC

L201

CLK

+4V

REC BIAS

SWITCH

Q228

BIAS OSC

Q223

SYSTEM CONTROLLER

IC901 (2/2)

91 O-LC72121/M61529/BU2099 DO 87 I-LC72121 DI 92 O-LC72121/BU2099 CLK

9 O-LC72121 CE 88 I-TUNER TUNE 97 I-TUNER STEREO

18 I-SPEANA L 19 I-SPEANA M 20 I-SPEANA H

76 I-HP MUTE

28 I-RMC

84 I-VOL A 83 I-VOL B

80 I-BASS A 79 I-BASS B

82 I-JOG A 81 I-JOG B

78 I-TRE A 77 I-TRE B

I-KEY1 –

I-KEY3

26 – 24

+9V

O-BU2099 LCK

O-M61529 CLK

S7/I-A-PHOTO

S6/I-A-MODE S9/I-B-MODE

I-REC (FWD)

S10/I-REC (REW)

XT1

CF1

CF2

O-KEYSCAN

I-B-PHOTO

S8/I-A-HALF

I-B-HALF

S1 – S5,

S11 – S23

G1 – G11

DECK A/B SELECT SWITCH, REC/PB EQ AMP

AIN (L)

BIN (L)

RECOUT (L)

1312XT2

93O-POWER LED

48 52 49 53 47 54 50

S10/U11

41 – 45, 56 – 6830 – 40

S7/U5

S8/U6

S6/U4

S9/U10

IC201

X901

32.768kHz

X902

8.64MHz

POWER 1 STANDBY/ON

EQOUT (L)

REC-IN (L)

MUTE-ON/OFF

REC MUTE-ON/OFF

LED901

B+

D603 – 610

S6 – S10

FLUORESCENT

INDICATOR TUBE

28 27

A/B

14 15

B+ SWITCH

Q921

FL902

8 9

7 BIAS

6 REC

11 TUNER MUTE

MCLK

+3.3V

DISC DIRECT PLAY

MUTE

TAI (L)

MULTI CONTROLLER

IC309

A/B

PB MUTE

REC MUTE

FRONT SPON/OFF

LM-L (CD) LM-R (CD) TM-L (CD) TM-R (CD)

LCK

CLK

S-OUT

LED201

LED202

TUNER BAND

LED203

MD (VIDEO)

LED204

TAPE A/B

LED301

LED302

LED303

LED213

i-BASS

PB-OUT (L)

13 12 15 14

3DATA 4CLOCK 5LCK

18SO

TAPE-L, REC-L

SP-F

LM-F, LM-R, TM-F, TM-R

TUNER-L

DI, SO, CLK, MCLK, LCK,

TAPE MECHANISM

DECK BLOCK

CAPM+

(CAPSTAN/REEL)

A-SOL

(DECK-A)

B-SOL

(DECK-B)

A-PHOTO B-PHOTO A-HALF B-HALF A-MODE B-MODE REC (FWD) REC (REW)

(Page 24)

(Page 22)

(Page 24)

15MANUAL

14HIP POP

13TECHNO

12SALSA

11VOCAL

10HEAVY

TAPE-L

REC-L

CAPSTAN/REEL

MOTOR DRIVE

Q601

PLUNGER DRIVE

(DECK-A)

Q602

PLUNGER DRIVE

(DECK-B)

Q603

LED211

MANUAL

LED210

HIP POP

LED208

TECHNO

LED207

SALSA

LED206

VOCAL

LED205

HEAVY

U5 U8 U6 U9 U4 U10 U7 U11

LM-F

LM-R

TM-F

TM-R

LCK

CLK

S-OUT

3 DATA 4 CLOCK 5 LCK

18 SO

6CD

7 TUNER

8 AUX

9 TAPE

LED DRIVER

IC201

3 DATA 4 CLOCK 5 LCK

18 SO

6 CD1

7 CD2

8 CD3

9 I-BASS

TAPE MECHANISM CONTROLLER

MOTOR

A-SOL

B-SOL

LED DRIVER,

IC202

2323

CX-JS7

6-3. BLOCK DIAGRAM – AMP/POWER SUPPLY Section –

JK302

MD (VIDEO)

(Page 22)

(Page 23)

CD-L

TUNER-L

TAPE-L, REC-L TAPE-L

DI, SO, CLK, MCLK, LCK

R-CH

REC-L

FREQUENCY

Q314 – 316

CONTROLLER

INPUT SELECTSWITCH, TONE CONTROL, ELECTRICAL VOLUME, BASS BOOST AMP

MD-L

CD-L

TUNER-L

TAPE-L

INA

VREF

CONTROL

12 – 10

CTRL1 –

CTRL3

BASS BOOST

IC310

TOUT

RECB-2

BASS BOOST ENHANCER

IC303

BASS BOOST

ON/OFF SWITCH

Q323

DATA4CLOCK

CLK

IC301

BBE

I-BASS

LCK

OUTA

BASS BOOST

CONTROL

Q317 – 320

16 – 13

BB CTRL1 –

BB CTRL4

VOLIN2

GIN

DATA22CLOCK

MCLK

BASS BOOST

CONTROL

Q492

SAOUT

OUT2

(Page 23)

SWITCHING

Q18

R-CH

SWITCHING

Q17, 19, 22

VM+10V

CENTER VOLATAGE

GENERATOR

Q324

FEED BACK

SWITCH

Q491

BUFFER

IC304

MUTING CONTROL

R-CH

O-POWER

MUTING

Q525

SWITCH

Q527

S-MUTE

+1.8V (MP3)

PRE DRIVE

Q517, 519

R-CH

CURRENT

MIRROR

Q521, 523

POWER OFF

MUTING DRIVER

Q529, 530

+1.8V

REGULATOR

IC803

VCC

CASCADE

Q511, 513, 515

D513

+3.3V

(MAIN)

B+ SWITCH

Q301, 302

R-CH

BIAS

Q507, 509

OVER CURRENT

DETECT

Q13

VM+10V

+4V

REGULATOR

IC306

P+7V

DECK+9V, M+9V

VM+9V

VM+10V

–VP

+VP

FINAL DRIVE

Q501, 503

D313 – 315

D102

POWER AMP

BLOCK

OVER LOAD

R-CH

REGULATOR

DETECT

Q505

HOLD

Q12

+9V

IC305

+9V

IC308

+10V

IC313

+VH

–VH

+VL

–VL

R-CH

+VH

+VL

–VH

–VL

DC DETECT

RELAY B++9V

OUTPUT LEVEL

DETECT Q20, 21

OUTPUT LEVEL

DETECT Q23, 24

Q5, 6

HOLD

Q7 – 9

HOLD

RECT

D301 – 304

RECT

D319 – 322

RECT

DC DETECT

Q329

THERMAL DETECT

Q10, 11

O-POWER

R-CH

RELAY B+

MAIN POWER

TRANSFORMER

PT901

R-CH

TH501,

502

FAN MOTOR

ON/OFF SWITCH

Q327, 328, 372, 373

M731

(FAN)

R-CH

RY501

R-CH

SPEAKER ON/OFF

RELAY DRIVE

Q304

S-MUTE, O-POWER, HOLD

SP-F

J221

PHONES

JK502

SPEAKER

+ –

(Page 23)

(Page 22)

R-ch is omitted due to same as L-ch.

SIGNAL PATH

: TUNER (FM/AM)

: CD PLAY

: TAPE PLAY

: REC

: MD (VIDEO) IN

(Page 22)

RESET, POWER DOWN

RESET

POWER DOWN

RESET SWITCH

Q901

RESET SIGNAL

GENERATOR

IC502

+3.3V (SUB)

D504

+4V

REGULATOR

IC501

EVER+10V

RECT

D902 – 905

SUB POWER

TRANSFORMER

PT902

VF1

FLUORESCENT

INDICATOR TUBE

VF2

–VFL

–30V

REGULATOR

Q533 – 536

POWER ON/OFF

RELAY DRIVE

Q330, 331

RY902

(AC IN)

2424

+ 56 hidden pages

Sony CXJS-7, CXJS-7 Service manual

TABLE OF CONTENTS

SERVICING NOTES

GENERAL

3-1. DISASSEMBLY FLOW

DISASSEMBLY

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

3-3. CASE (TOP)

3-4. TRAY PANEL

3-5. CD MECHANISM DECK (CDM74F-K6BD71A)

3-6. FRONT PANEL SECTION

3-7. MECHANICAL DECK

3-8. REAR CABINET SECTION

3-9. MAIN BOARD

3-10. POWER BOARD

3-11. TRANSFORMER BOARD

3-12. TABLE ASSY

3-13. MOTOR (TB) BOARD

3-14. MOTOR (LD) BOARD

3-15. BASE UNIT (BU-K6BD71A)

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

3-17. OPTICAL PICK-UP (KSS-213D)

TEST MODE

ELECTRICAL ADJUSTMENTS

DIAGRAMS

6-1. BLOCK DIAGRAM – CD Section –

6-2. BLOCK DIAGRAM – TUNER/TAPE/PANEL Section –

6-3. BLOCK DIAGRAM – AMP/POWER SUPPLY Section –