Sony CXJS-77 Service manual

CX-JS77

SERVICE MANUAL

Ver. 1.2 2005.05

CX-JS77 is the amplifier, CD player, tape deck
and tuner section in JAX-S77.

CD
Section

Tape deck
Section

US Model

Canadian Model

Model Name Using Similar Mechanism NEW
CD Mechanism Type CDM74-F1BD81
Base Unit Name BU-F1BD81A
Optical Pick-up Block Name KSM-215DCP
Model Name Using Similar Mechanism CX-JN5
Tape T ransport Mechanism T ype CWM43FF13

Amplifier section
AUDIO POWER SPECIFICATIONS

(USA models only)

POWER OUTPUT AND TOTAL HARMONIC
DISTORTION:

With 6 ohm loads, both channels driven, from
120 – 10,000 Hz: rated 180 watts per channel
minimum RMS power, with no more than 10%
total harmonic distortion from 250 milliwa tts to
rated output.

Continuous RMS power output (reference):

180 + 180 watts (6 ohms at
1 kHz, 10% THD)

Total harmonic distortion less than 0.07% (6 ohms at

1kHz, 80 W)

Inputs
VIDEO/MD IN (phono jacks):

voltage 450/250 mV,
impedance 47 kilohms

Outputs
PHONES (stereo mini jack):

accepts headphones of
8 ohms or more

SPEAKER: accepts impedance o f 6 to

16 ohms

SPECIFICATIONS

CD player section

System Compact disc and digital

Laser Semiconductor laser

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

Tape deck section

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

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range

Antenna FM lead antenna
Antenna terminals 75 ohms unbalanced
Intermediate frequency 10.7 MHz

audio system

(λ=780 nm)
Emission duration:
continuous

using Sony TYPE I
cassettes

87.5 – 108.0 MHz
(100-kHz step)

AM tuner section

Tuning range

Antenna AM loop antenna
Antenna terminals External antenna te rminal
Intermediate frequency 450 kHz

General

Power requirements
Power consumption
Dimensions (w/h/d) incl. projecting parts and controls
Amplifier/Tuner/Tape/CD section:

Mass

Design and specifications are subject to change
without notice.

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

120 V AC, 60 Hz
165 watts

Approx. 280 × 325 ×
425 mm
Approx. 9.9 kg

9-877-747-03 Sony Corporation

2005E05-1 Personal Audio Group
© 2005.05 Published by Sony Engineering Corporation

COMPACT DISC DECK RECEIVER

CX-JS77

r

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. Follo w the manufacturers’ instructions to use these
instruments.

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

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

To Exposed Metal
Parts on Set

AC

1.5 k

0.15 µF

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

Ω

Earth Ground

voltmete
(0.75 V)

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 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.

CAUTION

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

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.

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.

2

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE 0
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM­POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

TABLE OF CONTENTS

CX-JS77

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

2. GENERAL

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

Setting the Clock............................................................. 8

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 (CDM74-F1BD81) ...................... 11

3-6. Front Panel Block............................................................ 12

3-7. Back Panel Section.......................................................... 12

3-8. MAIN Board ................................................................... 13

3-9. Tape Mechanism Deck (CWM43FF13) ......................... 13

3-10. Table Assy ....................................................................... 14

3-11. MOTOR (TB) Board ....................................................... 14

3-12. MOTOR (LD) Board....................................................... 15

3-13. Base Unit (BU-F1BD81A) ............................................. 15

3-14. CD Board......................................................................... 16

4. TEST MODE.............................................................. 17

5. ELECTRICAL ADJUSTMENTS

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

7. EXPLODED VIEWS

7-1. Case Section .................................................................... 54

7-2. Tape Mechanism Deck Section (CWM43FF13) ............ 55

7-3. Cassette Box Section ...................................................... 56

7-4. F ront Panel Section ......................................................... 57

7-5. Back Panel Section.......................................................... 58

7-6. Chassis Section ............................................................... 59

7-7. CD Mechanism Deck Section-1 (CDM74-F1BD81) ..... 60

7-8. CD Mechanism Deck Section-2 (CDM74-F1BD81) ..... 61

7-9. CD Mechanism Deck Section-3 (CDM74-F1BD81) ..... 62

7-10. Base Unit Section (BU-F1BD81A) ................................ 63

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

6. DIAGRAMS

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

6-2. Block Diagram – MAIN Section – ................................ 23

6-3. Block Diagram

– PANEL/POWER SUPPLY Section – .......................... 24

6-4. Note for Printed Wiring Boards and

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

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

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

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

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

6-9. Printed Wiring Board

– CDMP3 CONNECT Board – ...................................... 30

6-10. Schematic Diagram

– CDMP3 CONNECT Board – ...................................... 31

6-11. Schematic Diagram – MAIN Section (1/4) –................ 32

6-12. Schematic Diagram – MAIN Section (2/4) –................ 33

6-13. Schematic Diagram – MAIN Section (3/4) –................ 34

6-14. Schematic Diagram – MAIN Section (4/4) –................ 35

6-15. Printed Wiring Boards – MAIN Section – .................... 36

6-16. Printed Wiring Board – PANEL Section – .................... 37

6-17. Schematic Diagram – PANEL Section (1/2) – .............. 38

6-18. Schematic Diagram – PANEL Section (2/2) – .............. 39

6-19. Printed Wiring Board – POWER AMP Section –......... 40

6-20. Schematic Diagram – POWER AMP Section – ............ 41

6-21. Printed Wiring Boards – TRANS Section – .................. 42

6-22. Schematic Diagram – TRANS Section – ...................... 43

3

CX-JS77

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.

4

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

1

Remove the case (side-L).

2

Turn the loading gear in the direction
of arrow A.

A

Pull-out the disc tray.

3

CX-JS77

SERVICE POSITION
– CD MECHANISM DECK –

CD mechanism deck

stand

CDMP3 CONNECT board

5

CX-JS77

– FRONT PANEL SECTION –

MAIN board

PANEL board

front panel section

– AMP BOARD –

TRANS board

tape mechanism deck

front panel section

SUB TRANS board

AMP board

MAIN board

6

• LOCATION OF CONTROLS

Main unit

ALPHABETICAL ORDER

A —N O —Z

ALBUM + wl
ALBUM – wl
BASS control 5
CD qh
CD SYNC qs
Deck A 9
Deck B wk
DISC 1 – 3 wd
DISC SKIP/EX-CHANGE wf
Disc tray ws
DISPLAY qg
Display window 4
ENTER 2
i-Bass qd
MIDDLE control 5

Operation Dial

P FILE 6
PHONES j ack qa
PLAY MODE w;
PRESET EQ 3
REC PAUSE/START 8
Remote sensor 7
SURROUND wa
TAPE A/B qk
TREBLE control 5
TUNER/BAND qj
TUNING MODE w;
VIDEO/MD ql
VOLUME control wh

(AMS/TUNING) qf

SECTION 2

GENERAL

BUTTON DESCRIPTIONS

?/1 (power) 1
Z PUSH (deck A) (eject) 0
Z (eject) wg
PUSH Z (deckB) (eject) wj
m (rewind) wl
x (stop) wl
H

(play) wl

X (pause) wl
M (fast forward) wl

CX-JS77

This section is extracted from
instruction manual.

qg
qf

qd
qs

qa
0

9

1

2

+–

3

j

5 6 74

qh qk qlw;waws

q

wd

++–

+–+–

–

Z Z

+–

++–

+–+–

–

wf
wg

wh

wj

wk

wl8

7

CX-JS77

Remote control

ALPHABETICAL ORDER

A – E

ALBUM + qa
ALBUM – qd
CD qk
CLEAR qg
CLOCK/TIMER SELECT 2
CLOCK/TIMER SET 3
DISC SKIP 0
DISPLAY wa
ENTER 9
EQ qf

F–Z

FM MODE 4
FUNCTION 6
PLAY MODE w;
REPEAT 4
SLEEP ws
TAPE qj
TUNER BAND 5
TUNER MEMORY ql
TUNING MODE w;
VOLUME +/– qs

ws
wa
w;
ql
qk
qj

qh

BUTTON DESCRIPTIONS

?/1 (power) 1
m/M (rewind/fast forward)

7

N (play) 8
X (pause) 8
x (stop) 8

–/+ (tuning) qh
./> (goback/go forward)

qh

1
2
3
4
5
6

7
8

Setting the clock

Use buttons on the remote for the oper ation.

1

Press ?/1 to turn on the system.

2

Press CLOCK/TIMER SET.

3

Press . or > repeatedly to set the
hour.

4

Press ENTER.

5

Press . or > repeatedly to set the
minute.

6

Press ENTER.

The clock starts working.

To adjust the clock

1

Press CLOCK/TIM ER SET.

2

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

3

Do the same procedures as step 3 to 6
above.

Notes

•The clock settings are canceled when you disconnect
the power cord or if a power failure occurs.

•You cannot set the clock in Power Sa ving Mode.

qg
qf

qd

9
q;

qa
qs

8

• 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-JS77

SECTION 3

DISASSEMBLY

3-3. CASE (TOP)

(Page 10)

3-5. CD MECHANISM DECK

(CDM74-F1BD81)
(Page 11)

3-6. FRONT PANEL

BLOCK
(Page 12)

3-9. TAPE

MECHANISM
DECK
(CWM43FF13)
(Page 13)

3-4. TRAY PANEL

3-7. BACK PANEL

3-8. MAIN BOARD

(Page 11)

SECTION
(Page 12)

(Page 13)

3-10. TABLE ASSY

(Page 14)

3-11. MOTOR (TB)

BOARD
(Page 14)

3-12. MOTOR (LD)

BOARD
(Page 15)

3-13. BASE UNIT

(BU-F1BD81A)
(Page 15)

3-14. CD BOARD

(Page 16)

9

CX-JS77

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

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

1

two screws
(case 3 TP2)

2

screw
(case 3 TP2)

3

two screws
(BVTP3

×

10)

7

case (side-R)

3-3. CASE (TOP)

4

case (side-L)

2

case (top)

5

three screws
(case 3 TP2)

1

two screws
(BVTP3 × 10)

6

two screws
(BVTP3 × 10)

10

3-4. TRAY PANEL

1

Turn the loading gear
in the direction of arrow A.

A

four claws

B

C

3

Remove the tray panel
in the direction of arrow C.

2

Pull-out the tray in the direction
of arrow B.

CX-JS77

3-5. CD MECHANISM DECK

(CDM74-F1BD81)

5

wire (flat type) (17 core)
(CN873)

2

screw
(BVTP3

×

10)

4

7

CD mechanism deck (CDM74-F1BD81)

6

two connectors
(CN701, CN874)

3

three screws
(BVTP3

×

10)

1

screw
(BVTP3

×

10)

11

CX-JS77

)

3-6. FRONT PANEL BLOCK

6

front panel block

3

2

screw
(BVTP3

4

1

wire (flat type) (29 core)
(CN302)

connector
(CN103)

×

8)

harness

2

connector
(CN112)

3-7. BACK PANEL SECTION

8

SUB TRANS board

7

two screws
(BVTP3

×

10)

2

connector
(CN308)

1

wire (flat type) (11 core)
(CN101)

5

three screws
(BVTP3

×

8)

4

duct cover

2

connector
(CN309)

9

back panel section

3

two screws
(BVTP3

×

10)

5

three screws
(BVTP3

×

10

12

6

two screws
(BVTP3

×

10)

3-8. MAIN BOARD

1

connector
(CN907)

4

3

connector
(CN307)

CX-JS77

MAIN board

3-9. TAPE MECHANISM DECK

(CWM43FF13)

2

two screws
(BVTP3

×

8)

1

six screws
(BVTP2.6

×

8)

2

tape mechanism deck (CWM43FF13)

13

CX-JS77

)

Ver. 1.2

3-10. TABLE ASSY

two claws

5

A

2

Pull-out the table assy.

6

table assy

3-11. MOTOR (TB) BOARD

1

screw
(PTPWH M2.6)

2

tray

1

Turn the loading gear
in the direction of arrow

3

belt (table)

4

hook

3

wire (flat type) (5 core
(CN702)

A

.

14

4

connector
(CN731)

6

5

two screws
(BTTP M2.6)

MOTOR (TB) board

3-12. MOTOR (LD) BOARD

4

MOTOR (LD) board

3

two screws
(BTTP M2.6)

CX-JS77

1

3-13. BASE UNIT (BU-F1BD81A)

belt (loading)

2

connector
(CN704)

5

4

three coil springs
(insulator)

3

three stoppers (BU)

three insulators

2

three screws
(BTTP M2.6)

1

wire (flat type) (17 core)
(CN201)

9

base unit
(BU-F1BD81A)

8

insulator

7

coil spring
(insulator)

6

floating screw
(PTPWHM2.6)

15

CX-JS77

)

3-14. CD BOARD

4

CD board

2

wire (flat type) (16 core
(CN101)

1

Remove four solders.

3

screw (2.6 × 8)

16

SECTION 4

TEST MODE

CX-JS77

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 the I/1 button to turn the power ON.

2. Press three buttons of x , [P FILE] and [DISC 1] simulta-

neously.

3. The message “COLD 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 ov er between 9 kHz and
10 kHz.

Procedure:

1. Press the I/1 button to turn the power ON.

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

3. Press the I/1 button to turn the power OFF.

4. Press two buttons of [PLAY MODE/TUNING MODE] and

I/1 simultaneously.

5. The message “AM 9K STEP” or “ AM 10K STEP” is display ed

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

CD SHIP (LOCK) 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 I/1 button to turn the power ON.

2. Press the [CD] button to select “CD”.

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

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

tor tube, and the CD ship mode is set.

CD SHIP (LOCK) MODE & COLD RESET

• This mode is used to perform CD chip (lock) mode and cold
reset simultaneously.

Procedure:

1. Press the I/1 button to turn the power ON.

2. Press the [CD] button to select “CD”.

3. Press three buttons of x , [CD] and [DISPLAY] simulta-

neously.

4. The message “COLD RESET” is displayed on the fluorescent

indicator tube momentarily, then becomes standby states.

CD TRAY LOCK MODE

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

Procedure:

1. Press the I/1 button to turn the power ON.

2. Press the [CD] button to select “CD”.

3. Set disc on the CD tray, press tw o b uttons of x and Z for 5

seconds.

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

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

5. T o release from this mode, press two buttons of x and Z for

5 seconds.

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

indicator tube and the CD tray is unlocked.

AMP TEST MODE

• This mode is used to display the parameter of amplifier IC and
display the VACS status.

Procedure:

1. Press the I/1 button to turn the power ON.

2. Press three buttons of x , [P FILE] and [PLAY MODE/

TUNING MODE] simultaneously.

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

TEST IN” is displayed on the fluorescent indicator tube
momentarily, then amplif ier adjustment mode is displayed on
the fluorescent indicator tube.

4. Press the [DISPLAY] button to changed over between VACS

status display mode and the amplifier IC parameter display
mode.

5. In the amplifier IC parameter display mode, press the [i-BASS]

button to changed over DBFB ON/OFF, and when it is ON,
the character “D” is displayed on the fluorescent indicator tube.

6. In the amplifier IC parameter display mode, press the

[SURROUND] button to changed over surround ON/OFF, and

when it is ON, the character “S” is displayed on the fluorescent
indicator tube.

7. In the amplifier IC parameter display mode, turn each knob of

[BASS], [MIDDLE] and [TREBLE] causes respective param-

eters to be changed, as well as change-over of the display on
the fluorescent indicator tube.

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. Press the I/1 button to turn the power ON.

2. Press two buttons of VIDEO (MD) and I/1 simultaneously.

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

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

17

CX-JS77

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 I/1 button to turn the power ON.

2. Press the [CD] button to select “CD”.

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

4. Press three buttons of x , [P FILE] and [DISC SKIP/EX-

CHANGE] simultaneously.

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

6. To release from this mode, press the I/1 button to turn the

power OFF and press the function buttons.

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.

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

“TAPE AAG-1 or TAPE BAG-2”

Shut off

FWD play the tape A

“TAPE AAG-3”

2 minutes

Rewind the tape A

“TAPE AAG-6”

Shut off

FWD play the tape B

“TAPE BAG-3”

2 minutes

Rewind the tape B

“TAPE BAG-6”

Aging mode sequence (CD section) :

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.

Shut off

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

PANEL TEST MODE

• This mode is used to check the fluorescent indicator tube, LEDs
and buttons.

Procedure:

1. Press the I/1 button to turn the power ON.

2. Press three buttons of x , [P FILE] and [ENTER] simulta-

neously.

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

4. Press two buttons of X and [ENTER] simultaneously, mode

is changed over.

5. In the key check mode, press each key, the defined key num-

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

6. In the key count check mode, “KEYCNT 0” is displayed on

the fluorescent indicator tube. Each time a key is pressed, “K”
value increases. Howev er , 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, “VOLUME FLAT” is displayed

on the fluorescent indicator tube. Turn the [VOLUME] knob
clockwise, the message “VOLUME UP” is displayed on the
fluorescent indicator tube momentarily and turn the [VOLUME]
knob counterclockwise, the message “VOLUME DOWN” is
displayed on the fluorescent indicator tube momentarily.

18

CX-JS77

MC TEST MODE

• This mode is used to check operations of microprocessor.

Procedure:

1. Press the I/1 button to turn the power ON.

2. Press three buttons of x , [P FILE] and [DISC 3] simulta­neously.

3. When the MC test mode is activated, VACS level is displayed
on the fluorescent indicator tube momentarily.

4. Turn the [AMS/TUNING] knob clockwise, the message “ALL
EQ MAX” is displayed on the fluorescent indicator tube mo­mentarily and turn the [AMS/TUNING] knob counterclock­wise, the message “ALL EQ MIN” is displayed on the fluo­rescent indicator tube momentarily.

5. Press the [PRESET EQ] button, the message “ALL EQ FLAT”
is displayed on the fluorescent indicator tube momentarily.

6. Turn the [VOLUME] knob clockwise, the message “VOLUME
MAX” is displayed on the fluorescent indicator tube momen­tarily and turn the [VOLUME] knob counterclockwise, the mes­sage “VOLUME MIN” is displayed on the fluorescent indica­tor tube momentarily.

7. Press the [i-BASS] button to changed over VACS ON/OFF.

8. When the [REC PAUSE/START] button is pressed twice with
a tape set in the deck-B, the function is switched “MD” or
“VIDEO” and recording starts. When the m or M button
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.

9. When the [CD SYNC] key is pressed with the test tape (AMS­100, 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.

10. Press the
set is performed.

I/1 button to release from this mode, then cold re-

VERSION DISPLAY MODE

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

version.

Procedure:

1. Press the I/1 button to turn the power ON.

2. Press three buttons of x , [P FILE] and [DISC 2] simulta­neously.

3. When this mode is activated, model and destination is displayed
on the fluorescent indicator tube.

4. Press the [DISPLAY] button to changed over between soft­ware version and year, month, day of the software creation
display mode and model and destination display mode.

5. T o release from this mode, press three buttons of x , [P FILE]
and [DISC 2] simultaneously.

CD ERROR CODE DISPLAY MODE

• This mode can be used for error code display of CD section.

Procedure:

1. Press the I/1 button to turn the power ON.

2. Press the [CD] key to select “CD”.

3. Press three buttons of x , [CD] and [DISC 1] simultaneously.

4. When this mode is activated, mechanism deck error code is
displayed on the fluorescent indicator tube.

5. Press the [i-BASS] button to changed over between optical
pick-up error code display mode and mechanism deck error
code mode.

6. Turn the [AMS/TUNING] knob to change over display of er­ror history.

1. Mechanism Deck Error Code Mode

• When this mode is entered, mechanism deck error code is dis­played with the 10-character format on the fluorescent indica­tor tube.

The first digit from the left indicates:

The first digit from the left indicates which mode the error history
is. In the mechanism deck error code mode, “M” is displayed on
the fluorescent indicator tube.

The second digit from the left indicates:
(Error history No. display)

The second digit from the left indicates which order the error history
is. “1” indicates the latest error history, and each time the number
increases by one, the error history goes back to one-previous error .

The third and 4th digit from the left indicates:
(Error status display)

The third and 4th digit from the left indicates which error status is
indicated.

Display Status

00 No error
08 Table operation time-out (Table does not move to

the target position within the specified time)

16 In the chucking down operation, the operation was

retried by the maximum number of times but the
operation could not be completed

17 In the chucking up and down operation, the reverse

recovery processing was attempted but it could not
be recovered

18 In the chucking up operation, the operation was

retried by the maximum number of times but the
operation could not be completed

20 Loading operation time-out (Table does not move

to the target position within the specified time)

22 As the chuck was in the ex-open status at the

initialization, the closing was attempted but could
not be completed

The 5th and 6th digit from the left indicates:
(Present status display)

The 5th and 6th digit from the left indicates which operating status
when an error occurred is indicated.

Display Status

01 Open completion status
02 From open status, the movement to chucking down

position is under way

03 From chucking down position, the open operation

is under way
04 Chucking down completion status
10 The chucking down operation is under way
11 The chucking up operation is under way
12 Close completion status
13 From close status, the ex-open operation is under

way
14 From ex-open status, the close operation is under

way
18 Ex-pen completion status

19

CX-JS77

The 7th and 8th digit from the left indicates:
(Motor status display)

The 7th and 8th digit from the left indicates which motor output
status when an error occurred is indicated.

Display Status

× 0 No table motor output
× 1Table motor forward output
× 2Table motor backward output
× 3Table motor break output

0 × No loading motor output
1 × Loading motor forward output
2 × Loading motor backward output
3 × Loading motor break output

The 9th and 10 th digit from the left indicates:
(Tray status display)

The 9th and 10th digit from the left indicates which target
processing when an error occurred is indicated.

Display Status

01 Open operation
12 Close operation
18 Ex-open operation

2. Optical Pick-up Error Code Mode

• When this mode is entered, optical pick-up error code is dis­played with the 8-character format on the fluorescent indicator
tube.

The first digit from the left indicates:

The first digit from the left indicates which mode the error history
is. In the optical pick-up error code mode, “D” is displayed on the
fluorescent indicator tube.

The second digit from the left indicates:
(Error history No. display)

The second digit from the left indicates which order the error history
is. “1” indicates the latest error history , and each time the n umber
increases by one, the error history goes back to one-previous error .

The 5th and 6th digit from the left indicates:
(Error step display)

The 5th and 6th digit from the left indicates which processing when
a trouble occurred

Display Contents

01 Power OFF in progress
02 Initialize in progress
03 Oscillation stopping
04 From oscillation stop, oscillation starting
05 Stopping
06 Stop operation is under way
07 Start operation in progress
08 TOC read in progress
09 Search operation is under way
0A Playback operation is under way
0B Pause operation is under way
0C Playback manual search operation is under way
0D Pause manual search operation is under way
0E —

The 7th and 8th digit from the left indicates:

The 7th and 8th digit from the left indicates which operation in
progress when a trouble occurred. (Step of each processing of the
5th and 6th digits is indicated)

5 REPEAT LIMIT CANCEL MODE

• 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 I/1 button to turn the power ON.

2. Press the [CD] button to select “CD”.

3. Press three buttons of x , [CD] and [ENTER] simultaneously.

4. The message “LIMIT OFF” is displayed on the fluorescent

indicator tube momentarily, CD repeat 5 limit is cancelled.

The third and 4th digit from the left indicates:
(Error status display)

The third and 4th digit from the left indicates which error status is
indicated.

Display Status

01 Not focused (TOC read without a disc)
02 GFS NG (TOC read with a disc chucked)
03 Start operation time-over
04 Defocused continuously (Defocused during TOC

reading)
05 Q code not entered for specified time
06 Tracking not turned ON
07 Blank disc (Blank disc TOC read)

20

symmetry

S-curve waveform

within 3

±

0.5 Vp-p

A

B

SECTION 5

p

ELECTRICAL ADJUSTMENTS

CX-JS77

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

CD board

TP(FE)
TP(VC)

Procedure :

1. Connect an oscilloscope to TP (FE) and TP (VC) on the CD
board.

2. Press the I/1 button to 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.

RF signal waveform

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

– CD BOARD (Conductor Side) –

TP

(VC)

level : 1.3

±

0.3 Vp-

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.

Connecting Location: CD board

RFAC LEVEL CHECK

oscilloscope

CD board

TP(RFACO)
TP(VC)

Procedure :

1. Connect an oscilloscope to TP (RFACO) and TP (VC) on the
CD board.

2. Press the I/1 button to turn the power ON.

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

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

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

clearly distinguished at the center of the waveform.

TP

(FE)

IC101

TP

(RFACO)

Connecting Location: CD board

2121

CX-JS77

6-1. BLOCK DIAGRAM – SERVO Section –

SECTION 6

DIAGRAMS

DETECTOR

A

B

C

D

F

E

OPTICAL PICK-UP

BLOCK

(KSM-215DCP)

LASER DIODE

PD

2-AXIS

DEVICE

(TRACKING)

(FOCUS)

I-V AMP

LD

M101

(SPINDLE)

M102

(SLED)

M

M

CD +3V

AUTOMATIC

POWER

CONTROL

Q10

CH4OUTF

16

CH4OUTF

15

CH3OUTF

17

CH3OUTR

18

CH1OUTF

14

CH1OUTR

13

CH2OUTF

12

CH2OUTR

11

A

26

B

27

C

28

D

29

F

20

E

19

LD

36

MOTOR/COIL DRIVE

IC251

MOTOR

DRIVE

MOTOR

DRIVE

COIL

DRIVE

COIL

DRIVE

MUTE

20

CH4IN

CH3FIN

CH3RIN

CH1FIN

CH1RIN

CH2FIN

CH2RIN

SUMMING

FOCUS

ERROR

TRACKING

ERROR AMP

APC LD

AMP

24

23

21

4

5

5

7

RF

AMP

AMP

FILTER

CD DSP

IC101 (1/2)

AC_

SUM

34

FEO

24

TEO

22

PD

37

OPIN+

OPOUT

27

SFDR

9

SRDR

10

TFDR

11

TRDR

12

FFDR

13

FRDR

14

EQ_

IN

35

2

CD DSP

IC101 (2/2)

PWM GENERATOR

FOCUS/TRACKING/SLED

S101

(LIMIT)

RFAC

VCA

21 23

TEI

CONVERTER

FOCUS/

TRACKING/SLED

SERVO DSP

A/D

EQ

FEI

SSTP

7

RFACO

41

INTERFACE

SERVO AUTO

SEQUENCER

TO CPU INTERFACE

MIRR,
DFCT, FOK
DETECTOR

SERVO

42

45

46

RFACI

ASYI

ASYO

DIGITAL

CLV

PROCESSOR

FOK

MIRR

DFCT

COUT

SCLK

ASYMMETRY

CORRECTOR

MDP

6

100

3
1
2

119

108

XRST

51 53

FILI

PCO

FILO

CLTV

DIGITAL PLL

TO SERVO AUTO

SEQUENCER

CPU INTERFACE

DATA

CLOCK

XLAT

95

97 94

O-CD-CLK

O-CD-DATA

O-XLT (CD-LAT)

SYSTEM CONTROLLER

O-XRES (RESET)

93

1125052

XPCK

DEMODULATOR

SUBCODE

PROCESSOR

SQSO

EXCK

SCOR

SENS

SBSO

96 97

98 99115107102 105 104 110 111

I-SENS

IC601 (1/3)

O-MP3-DO

O-MP3-CLK

O-MP3 CS
I-MP3 ACK
I-MP3 REQ

I-SCOR (Q-DATA REQ)

O-MP3 LP

O-MP3 RESET

EFM

SQCK

I-MP3-DI

O-XTCN

32K

RAM

INTERNAL BUS

WFCK

XUGF

GFS

113

99
98

100

1
3
4
2
6

92

73I-CD NUM SENSER

20I-CD ENCODER

21I-CD OPEN/CLOSE

CORRECTOR

EMPH

68

MIDIO

6

MICK

7

MICS

4

MIACK

8

PO11/BUCK/AD14

36

MILP

5

RESET

2

ERROR

MP3 DECODER

IC301

LEVEL SHIFT

ROTARY

ENCODER

INTERFACE

M751

(LOADING)

M741

(TABLE)

Q731

S711

CLOSE

D/A

DIGITAL

M

M

ADDRESS DETECT

OPEN

117 93

C4M

CONVERTER

SELECTOR

LRCK

BCK

63 66 65

16

15

19

18 14

LRCKIA

SBSY/BCKIB

SFSY/LRCKIB

LOADING MOTOR DRIVE

4 OUT1

2 OUT2

TABLE MOTOR DRIVE

4 OUT1

2 OUT2

TABLE ADDRESS

SENSOR

IC731

DISC TRAY

S751

OPEN/CLOSE

DETECT

GENERATOR

D/A

PCMD

SDI0

BCKIA

CLOCK

LRCKI

BCKI

62 60 61

IC701

IC712

XTSL

XTAO

77

PCMDI

1196 5

SDO0

STANDBY

7FIN

9RIN

7FIN

9RIN

XTAI

XTACN

AOUT1

AOUT2

78

95

81

86

3

R-CH

MP3-STB

LM-F

LM-R

TM-F

TM-R

16.9344MHz

MUTING

MUTING
CONTROL
Q304, 305

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

• SIGNAL PATH

: CD PLAY

X171

Q306

CD-MUTING

R-CH

CD

A

CD-MUTING,

MP3-STB,

LM-F, LM-R,

TM-F, TM-R

(Page 23)

B

(Page 23)

2222

6-2. BLOCK DIAGRAM – MAIN Section –

CX-JS77

FM 75Ω

COAXIAL

AM

(Page 22)

HP1

(PB)

(DECK-A)

HRPE1

(REC/PB/ERASE)

(DECK-B)

JK101

VIDEO/MD

FM/AM TUNER PACK

FM ANT

ANT GND

AM ANT

ANT GND

L-CH

R-CH R-CH

L-CH

R-CH R-CH

ERASE

IN

A

L

R

CD

TUNER-L

TUNER-R

LC72121 DI

LC72121 DO

LC72121 CLK

LC72121 CE

TUNED

STEREO

TU MUTE

R-CH

R-CH

TUNED

STEREO

TU-MUTING

REC/PB
SWITCH

IC201,

Q322, 323

CLK

MD L

63

+

D206

–1

–2

PROTECTOR

Q486, 488

FAN MOTOR

DRIVE

Q310

RY441

+
–

+
–

M901

MM

(FAN)

L

R

JK441

SPEAKER

IMPEDANCE

USE 6 – 16Ω

J801

PHONES

MUTING

Q105

B+9V

LINE AMP

IC102

R-CH

MUTING

Q103

MUTING
CONTROL
Q101, 102

R-CH

R-CH

POWER

AMP

IC441

STANDBY

SWITCH

Q489

LEVEL
SHIFT

Q490, 491

POWER AMP

ON/OFF

Q308

TH441

POWER ON

MUTING

Q309, 313

THERMAL

DETECT

Q483, 484

OVER LOAD

Q441, 442

B+9V

Q485, 487

DETECT

+

PROTECT

DETECT

D481

+

DC

DETECT

Q481, 482

TONE OUT1

CD L

1

TUNER L

61

DO

DI

CE

3

7

9

11

TAPE L

PB OUT1

TAPE A1
TAPE B1

37

INPUT SELECT,

TONE CONTROL,

ELECTRICAL VOLUME

36

IC101

VIN1

VOL OUT1

SAOUT1

AMS OUT

REC OUT1

SI

19

18

33

FEED BACK

SWITCH

Q106

56

+

R-CH

40

15

SC

POWER ON

R-CH

D201

+

BAND-PASS

FILTER

Q351, 352

D207

BIAS OSC

L101

BIAS OSC

Q321

REC BIAS

SWITCH

Q324

B +9V

AMS DETECT

Q327

(Page 22)

(Page 24)

CD-MUTING, MP3-STB,
LM-L, LM-R, TM-L, TM-R

B

FRONT SP RELAY

C

TU-MUTING

CD-MUTING

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

MP3-STB

DI

CE

DO

CLK

TUNED

STEREO

83

86

84

67

85

O-LC72121/BU2099FV DO

68

I-TUNED-IN

I-LC72121 DI

I-STEREO-IN

O-LC72121 CE

O-LC72121/BU2099FV CLK

LOADING/TABLE

MOTOR DRIVE

IC371

7

Q5

11

Q4

10

Q8

14

Q7

13

Q10

16

Q9

15

Q11

17

Q16Q0

DATA4CLOCK5LCH

3

Q6

12

MOTOR/PLUNGER DRIVER

IC602

MOTOR

SO

18
11

3
4
5

MP3-STB

DATA
CLOCK
LCH

SOL-A

SOL-B

8

6

7

CAPSTAN/REEL

MOTOR DRIVE

Q601

PLUNGER DRIVE

(DECK-A)

Q603

PLUNGER DRIVE

(DECK-B)

Q602

TAPE MECHANISM

DECK BLOCK

CAPM+

MM

(CAPSTAN/REEL)

A-SOL

(DECK-A)

B-SOL

(DECK-B)

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

• SIGNAL PATH

: TUNER

: CD PLAY

: TAPE PLAY (DECK-A)

: TAPE PLAY (DECK-B)

: REC

: AUX IN

87

O-BU2099FV LCH

91

88

O-BD3401 CLK

O-BD3401 DATA

69

I-AMS-IN

SYSTEM CONTROLLER

IC601 (2/3)

24

I-STREAM/VACS

19

18

I-PROTECT

WFR/HP/MIC-IN

75

O-SYSTEM-MUTE

I-TAPE A STAT

I-TAPE B STAT

I-REEL A IN

I-REEL B IN

A-HALF

A-MODE

22

23

70

71

REC (REW)

B-HALF

B-MODE

REC (FWD)

A-PHOTO

B-PHOTO

2323