Sony CXJN-44 Service manual

CX-JN44

SERVICE MANUAL

Ver. 1.2 2005.05

CX-JN44 is the amplifier, CD player, tape deck
and tuner section in JAX-S44.

CD CD Mechanism Type CDM74-K6BD80
Section Base Unit Name BU-K6BD80A

Tape deck Model Name Using Similar Mechanism NEW
Section T ape Transport Mechanism Type CWM43FF13

US Model

Canadian Model

Model Name Using Similar Mechanism NEW

Optical Pick-up Name KSM-213DAP

Main unit
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 140 watts per channel
minimum RMS power, with no more than 10%
total harmonic distortion from 250 milliwatts to
rated output.

Continuous RMS power output (reference):

140 + 140 watts (6 ohms at
1 kHz, 10% THD)

Total harmonic distortionless than 0.07% (6 ohms at

1kHz, 60 W)

Inputs
VIDEO/MD IN (phono jacks):

voltage 450/250 mV,
impedance 47 kilohms

Outputs
PHONES (stereo mini jack):

accepts headphones of
8ohms or more

SPECIFICATIONS

SPEAKER: accepts impedance of 6 to

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

16 ohms

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 terminal
Intermediate frequency 450 kHz

General

Power requirements
Power consumption
USA models:
Canadian models:

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

Mass

Design and specifications are subject to chang e
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

205 watts
260 VA

Approx. 280 × 325 ×
425 mm

Approx. 9.8 kg

9-877-749-03

2005E05-1
© 2005.05

COMPACT DISC DECK RECEIVER

Sony Corporation

Personal Audio Group
Published by Sony Engineering Corporation

CX-JN44

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. Follow the manuf acturers’ 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 low-v oltage
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)

To Exposed Metal
Parts on Set

AC

0.15 µF

1.5 k

Ω

Earth Ground

voltmete
(0.75 V)

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

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.

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 PAR UNE MARQUE 0 SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE
FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS
QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT
DONNÉS DANS CE MANUEL OU D ANS LES SUPPLÉMENTS
PUBLIÉS PAR SONY.

TABLE OF CONTENTS

CX-JN44

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

2. GENERAL ................................................................... 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 (CDM74-K6BD80)...................... 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-K6BD80A) ............................................. 15

3-14. Motor Gear Assy (SLED) (M102), CD Board ................ 16

3-15. Optical Pick-up (KSM-213DAP) .................................... 16

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

5. ELECTRICAL CHECK............................................ 21

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. Printed Wiring Board – BD Board – .............................. 26

6-5. Schematic Diagram – BD Board – ................................. 27

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

6-7. Schematic Diagram – CHANGER Section – ................. 29

6-8. Printed W iring Board

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

6-9. Schematic Diagram

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

6-10. Schematic Diagram – MAIN Section (1/4) – ................. 32

6-11. Schematic Diagram – MAIN Section (2/4) – ................. 33

6-12. Schematic Diagram – MAIN Section (3/4) – ................. 34

6-13. Schematic Diagram – MAIN Section (4/4) – ................. 35

6-14. Printed Wiring Boards – MAIN Section – ..................... 36

6-15. Printed Wiring Board – PANEL Section – ..................... 37

6-16. Schematic Diagram – PANEL Section (1/2) – ............... 38

6-17. Schematic Diagram – PANEL Section (2/2) – ............... 39

6-18. Printed Wiring Board – POWER AMP Section – .......... 40

6-19. Schematic Diagram – POWER AMP Section – ............. 41

6-20. Printed Wiring Boards – TRANS Section –................... 42

6-21. Schematic Diagram – TRANS Section – ....................... 43

6-22. IC Pin Function Description ............................................ 47

7. EXPLODED VIEWS

7-1. Case Section .................................................................... 50

7-2. Tape Mechanism Deck Section (CWM43FF13) ............. 51

7-3. Cassette Box Section....................................................... 52

7-4. Front Panel Section ......................................................... 53

7-5. Back Panel Section.......................................................... 54

7-6. Chassis Section................................................................ 55

7-7. CD Mechanism Deck Section-1 (CDM74-K6BD80) ..... 56

7-8. CD Mechanism Deck Section-2 (CDM74-K6BD80) ..... 57

7-10. CD Mechanism Deck Section-3 (CDM74-K6BD80) ..... 58

7-11. Base Unit Section (BU-K6BD80A) ................................ 59

8. ELECTRICAL PARTS LIST .................................. 60

3

CX-JN44

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 pick­up block. Therefore, when checking the laser diode emission,
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.

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-JN44

SERVICE POSITION
– CD MECHANISM DECK –

CD mechanism deck

stand

CDMP3 CONNECT board

5

CX-JN44

– 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

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 jack qa
PLAY MODEw;
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 (deck B) (eject) wj
m (rewind) wl
x (stop) wl
H

(play) wl

X (pause) wl
M (fast forward) wl

CX-JN44

This section is extracted
from instruction manual.

qg
qf

qd
qs

qa
0

9

1

4j

2

3

5 6 7

qh qqkqlw;waws

wd

+–

++–

+–+–

–

Z Z

+–

++–

+–+–

–

wf
wg

wh

wj

wk

wl8

7

CX-JN44

Remote control

ALPHABETICAL ORDER

A – E

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
./> (go back/go forward)

qh

1
2
3
4
5
6

7
8

Setting the clock

Use buttons on the remote for the operation.

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/TIMER 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 Saving Mode.

qg
qf

qd

9
q;

qa
qs

8

SECTION 3

DISASSEMBLY

•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-JN44

3-3. CASE (TOP)

(Page 10)

3-5. CD MECHANISM DECK

(CDM74-K6BD80)
(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-K6BD80A)
(Page 15)

3-14. MOTOR GEAR ASSY (SLED) (M102),

CD BOARD
(Page 16)

3-15. OPTICAL PICK-UP

(KSM-213DAP)
(Page 16)

9

CX-JN44

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-JN44

3-5. CD MECHANISM DECK

(CDM74-K6BD80)

5

wire (flat type) (7 core)
(CN603)

2

screw
(BVTP3

×

10)

4

7

CD mechanism deck (CDM74-K6BD80)

6

two connectors
(CN701, CN874)

3

three screws
(BVTP3

×

10)

1

screw
(BVTP3

×

10)

11

CX-JN44

)

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-JN44

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-JN44

)

Ver. 1.2

3-10. TABLE ASSY

5

two claws

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-JN44

1

3-13. BASE UNIT (BU-K6BD80A)

belt (loading)

2

connector
(CN704)

5

4

three coil springs
(insulator)

3

three stoppers (BU)

three insulators

2

three screws
(BTTP M2.6)

9

base unit
(BU-K6BD80A)

8

insulator

7

coil spring
(insulator)

6

floating screw
(PTPWHM2.6)

1

wire (flat type) (27 core)
(CN201)

15

CX-JN44

)

n

3-14. MOTOR GEAR ASSY (SLED) (M102), CD BOARD

7

gear (A)

6

claw

2

two screws

×

3)

(P2

qa

CD board

8

gear (B)

5

wire (flat type) (16 core
(CN101)

1

Remove two
solders.

4

3-15. OPTICAL PICK-UP (KSM-213DAP)

9

Remove two solders.

3

Remove the optical pick-up
(KSM-213DAP) in the directio
of arrow B.

B

0

motor gear assy (SLED)
(M102)

3

screw (2.6 × 8)

16

2

sled shaft

A

1

Slide the lever
in the direction of arrow

A

.

SECTION 4

TEST MODE

CX-JN44

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 ?/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 over between 9 kHz

and 10 kHz.

Procedure:

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

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

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

4. Press two buttons of [PLAY MODE/TUNING MODE] and
?/1 simultaneously.

5. The message “AM 9K STEP” or “ AM 10K STEP” is displa yed
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 ?/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 indicator
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 ?/1 button to turn the power ON.

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

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

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 ?/1 button to turn the power ON.

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

3. Set disc on the CD tray, press two buttons of x and Z for
5 seconds.

4. The message “LOCKED” is displayed on the fluorescent
indicator 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. To 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 ?/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 ov er 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 parameters
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 ?/1 button to turn the power ON.

2. Press two buttons of [VIDEO/MD] and ?/1 simultaneously.

3. The message “MD” or “VIDEO”is displayed on the fluorescent
indicator tube, and the function of external input is changed
over.

17

CX-JN44

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 ?/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 ?/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.

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

“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”

Shut off

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.

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 ?/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 ke y number
of every each key list is displayed on the fluorescent indica tor
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. Howe ver, once a k ey 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-JN44

MC TEST MODE

• This mode is used to check operations of microprocessor.

Procedure:

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

2. Press three buttons of x , [P FILE] and [DISC 3] simulta-
neously.

3. When the MC test mode is activated, VACS lev el 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 “TAPE
B”, then playback starts.

9. When the [CD SYNC] key is pressed 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.

10. Press the ?/1 button to release from this mode, then cold reset
is performed.

VERSION DISPLAY MODE

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

version.

Procedure:

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

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

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

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

5. To release from this mode, press three b uttons 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 ?/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 pick­up error code display mode and mechanism deck error code
mode.

6. Turn the [AMS/TUNING] knob to change o ver 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-JN44

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 number
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 “REPEA T”. This mode is used to enables CD to repeat
playback for limitless times.

Procedure:

1. Press the ?/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

SECTION 5

ELECTRICAL CHECK

Note:

1. CD Block is basically constructed to operate without
adjustment.

2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

3. Use an oscilloscope with more than 10 MΩ 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.

5. Check the focus bias check when optical block is replaced.

FOCUS BIAS CHECK

oscilloscope

(DC range)

BD board

CX-JN44

TP012 (RFACO)
TP013 (VC)

+
–

Procedure :

1. Connect the oscilloscope to TP012 (RFA CO) and TP013 (VC)
on the BD board.

2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)

3. Press the H button.

4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape (◊) in the
center of the waveform can be clearly distinguished.

• RF signal reference waveform (eye pattern)

VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns

1.1

0.2 Vp-p

When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.

Checking Location:

– BD BOARD (Conductor Side) –

TP012

(RFACO)

TP013

(VC)

2121

CX-JN44

6-1. BLOCK DIAGRAM – SERVO Section –

SECTION 6

DIAGRAMS

DETECTOR

A

B

C

D

F

E

OPTICAL PICK-UP

BLOCK

(KSM-213DAP)

LASER DIODE

PD

I-V AMP

LD

CD +3V

AUTOMATIC

POWER

CONTROL

Q10

FILTER

CD DSP

IC101 (1/2)

A

25

B

26

C

27

D

28

F

19

E

18

LD

34

SUMMING

AMP

FOCUS

ERROR

TRACKING

ERROR AMP

APC LD

AMP

RF

AMP

AC_

SUM

FEO

TEO

EQ_

IN

32

23

21

PD

35

RFAC

33

VCA

RFACO

EQ

38

39

42
43

RFACI

ASYI
ASYO

DIGITAL

CLV

PROCESSOR

MDP

6

ASYMMETRY

CORRECTOR

93

XRST

48 50

FILI

PCO

FILO

CLTV

DIGITAL PLL

TO SERVO AUTO

SEQUENCER

CPU INTERFACE

DATA

CLOCK

XLAT

95

97 94

1054749

XPCK

DEMODULATOR

SUBCODE

PROCESSOR

EXCK

SCOR

SENS

SBSO

89 90

91 9210810095 98 97 103 104

96 5

EFM

SQSO

SQCK

WFCK

XUGF

INTERNAL BUS

GFS

EMPH

64

106

32K

RAM

ERROR

CORRECTOR

D/A

DIGITAL

INTERFACE

110 86

C4M

GENERATOR

D/A

CONVERTER

SELECTOR

LRCK

BCK

PCMD

59 62 61

XTSL

CLOCK

LRCKI

BCKI

58 56 57

PCMDI

XTAO

XTAI

XTACN

AOUT1

AOUT2

72
73

88

76

81

R-CH

X171

16.9344MHz

MUTING

Q306

MUTING
CONTROL
Q304, 305

R-CH

CD

(Page 23)

A

2-AXIS

DEVICE

(TRACKING)

(FOCUS)

M101

(SPINDLE)

M102

(SLED)

I-SENS

O-CD-CLK

MOTOR/COIL DRIVE

IC251

CH4OUTF

16

M

M

15

17
18

14
13

12
11

CH4OUTF

CH3OUTF
CH3OUTR

CH1OUTF
CH1OUTR

CH2OUTF
CH2OUTR

MOTOR

DRIVE

MOTOR

DRIVE

COIL

DRIVE

COIL

DRIVE

MUTE

CH4IN

24

27

CH3FIN

23

CH3RIN

22

CH1FIN

4

CH1RIN

5

CH2FIN

5

CH2RIN

7

20

OPOUT

OPIN+

2

20 22

CD DSP

IC101 (2/2)

SFDR

9

SRDR

10

TFDR

11

TRDR

12

FFDR

13

FRDR

14

PWM GENERATOR

FOCUS/TRACKING/SLED

S101

(LIMIT)

FEI

TEI

A/D

CONVERTER

FOCUS/

TRACKING/SLED

SERVO DSP

SSTP

7

MIRR,
DFCT, FOK
DETECTOR

SERVO

INTERFACE

SERVO AUTO

SEQUENCER

TO CPU INTERFACE

FOK

MIRR

DFCT

COUT
SCLK

3
1
2

112

101

O-CD-DATA

O-XLT (CD-LAT)

SYSTEM CONTROLLER

IC601 (1/3)

O-XRES (RESET)

93

I-SCOR (Q-DATA REQ)

O-XTCN

CD-MUTING

92

LOADING MOTOR DRIVE

IC701

M751

M741

(TABLE)

M

M

ADDRESS DETECT

OPEN

CLOSE

(LOADING)

73I-CD NUM SENSER

20I-CD ENCODER

21I-CD OPEN/CLOSE

LEVEL SHIFT

Q731

ROTARY

ENCODER

S711

4 OUT1
2 OUT2

TABLE MOTOR DRIVE

4 OUT1
2 OUT2

TABLE ADDRESS

SENSOR

IC731

DISC TRAY

S751

OPEN/CLOSE

DETECT

7FIN
9RIN

IC712

7FIN
9RIN

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

• SIGNAL PATH

LM-F

LM-R

TM-F

TM-R

: CD PLAY

CD-MUTING,

LM-F, LM-R,

TM-F, TM-R

B

(Page 23)

2222