AIWA CX-JN20, CX-JN30 Service Manual

CX-JN20/JN30

SERVICE MANUAL

Ver 1.0 2004.03

CX-JN20/JN30 are the tuner, amplifier, cassette
deck and CD player section in JAX-N20/N30. Photo: CX-JN30

Model Name Using Similar Mechanism CX-JN3

CD
Section

Tape deck
Section

CD Mechanism Type CDM74S-K6BD71A
Base Unit Name BU-K6BD71A
Optical Pick-up Block Name KSM-213DCP
Optical Pick-up Name KSS-213D
Model Name Using Similar Mechanism CX-JN3
T ape Transport Mechanism Type CWM43FF13

AEP Model

CX-JN20/JN30

UK Model

CX-JN30

TUNER

FM tuning range 87.5 MHz to 108 MHz
FM usable sensitivity (IHF) 16.8 dBf
FM antenna terminal 75 ohms (unbalanced)
AM tuning range 531 kHz to 1602 kHz
AM usable sensitivity 350 µV/m
AM antenna Loop antenna

AMPLIFIER

Power output CX-JN30

Rated: 32 W + 32 W (6 ohms, T .H.D.
1 %, 1 kHz/DIN 45500)
Reference: 40 W + 40 W (6 ohms,
T.H.D. 10 %, 1 kHz/DIN 45324)
MUSIC POWER: 100 W +100 W

CX-JN20

Rated: 20 W + 20 W (6 ohms, T .H.D.
1 %, 1 kHz/DIN 45500)
Reference: 25 W + 25 W (6 ohms,
T.H.D. 10 %, 1 kHz/DIN 45324)
MUSIC POWER: 50 W + 50 W

Total har monic distortion 0.08 % (16 W, 1 kHz, 6 ohms, DIN

AUDIO)
Input VIDEO/AUX: 400 mV
Outputs SPEAKER: 6 ohms or more

PHONES: 32 ohms or more

SPECIFICATIONS

CASSETTE DECK

Track format 4 tracks, 2 channels stereo
Frequency response 50 Hz – 8 kHz
Recording system AC bias
Heads Deck A: playback x 1

Deck B: recording/playback x 1,
erase x 1

CD PLAYER

Laser Semiconductor laser (λ = 780 nm)

Emission duration:

continuous
D/A converter 1 bit dual
Signal-to-noise ratio 85 dB (1 kHz, 0 dB)
Harmonic distortion 0.05 % (1 kHz, 0 dB)

GENERAL

Power requirements 230 V AC, 50/60 Hz
Power consumption CX-JN30

65 W

CX-JN20

60 W
Power consumption With ECO mode on: 0.25 W
in standby mode With ECO mode off: 15 W
Dimensions (W x H x D) 280 x 330 x 392.5 mm

Weight CX-JN30

6.6 kg

CX-JN20

6.5 kg

Specifications and external appearance are subject to change
without notice.

COPYRIGHT

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.

9-877-599-01 Sony Corporation

2004C05-1 Home Audio Company
© 2004.03 Published by Sony Engineering Corporation

COMPACT DISC DECK RECEIVER

CX-JN20/JN30

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.

This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER
PRODUCT MARKING is
located on the rear exterior.

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

TABLE OF CONTENTS

CX-JN20/JN30

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 (CDM74S-K6BD71A)................ 11

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

3-7. Mechanical Deck (CWM43FF13) .................................. 12

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

3-9. PT Board, MAIN Board.................................................. 13

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

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

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

3-13. Base Unit (BU-K6BD71A) ............................................. 15

3-14. Motor Gear Assy (Sled) (M701), BD Board .................. 16

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

5. ELECTRICAL ADJUSTMENTS

CD Section ...................................................................... 19

6. DIAGRAMS

6-1. Block Diagram – CD Section – ..................................... 20

6-2. Block Diagram – TUNER/TAPE/PANEL Section –..... 21

6-3. Block Diagram – AMP/POWER SUPPLY Section – ... 22
6-4. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 23

6-5. Printed W iring Board – BD Section – ........................... 24

6-6. Schematic Diagram – BD Section –.............................. 25

6-7. Printed W iring Boards – CHANGER Section –............ 26

6-8. Schematic Diagram – CHANGER Section –................ 27

6-9. Schematic Diagram – MAIN Section (1/4) –................ 28

6-10. Schematic Diagram – MAIN Section (2/4) – ................ 29

6-11. Schematic Diagram – MAIN Section (3/4) – ................ 30

6-12. Schematic Diagram – MAIN Section (4/4) – ................ 31

6-13. Printed Wiring Board – MAIN Section – ...................... 32

6-14. Printed Wiring Board – HP Section – ........................... 33

6-15. Schematic Diagram – HP Section – .............................. 33

6-16. Printed Wiring Board – PANEL Section – .................... 34

6-17. Schematic Diagram – PANEL Section –....................... 35

6-18. Printed Wiring Boards – KEY Section – ....................... 36

6-19. Schematic Diagram – KEY Section – ........................... 37

6-20. Printed Wiring Board – PT Section – ............................ 38

6-21. Schematic Diagram – PT Section – ............................... 39

7. EXPLODED VIEWS

7-1. Case Section.................................................................... 45

7-2. Tape Deck Section .......................................................... 46

7-3. Panel Board Section........................................................ 47

7-4. Key Section ..................................................................... 48

7-5. Front Cabinet Section ..................................................... 49

7-6. Chassis Section ............................................................... 50

7-7. CD Mechanism Deck Section-1

(CDM74S-K6BD71A) .................................................... 51

7-8. CD Mechanism Deck Section-2

(CDM74S-K6BD71A) .................................................... 52

7-9. CD Mechanism Deck Section-3

(CDM74S-K6BD71A) .................................................... 53

7-10. Base Unit Section (BU-K6BD71A) ............................... 54

8. ELECTRICAL PARTS LIST ............................... 55

3

CX-JN20/JN30

SECTION 1

SER VICING 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 x key, press the OPEN/CLOSE Z key for 5
seconds. The message “UNLOCKED” is displayed and the tray is
unlocked.

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

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

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

CX-JN20/JN30

3

Pull-out the disc tray.

5

CX-JN20/JN30

SERVICE POSITION
– CD mechanism deck –

main board (CN691)

– Tape mechanism deck –

Connect wire (flat type) (19 core) to
main board (CN691) and BD board (CN710).

BD board (CN710)

panel board (CN601)

main board (CN302)

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

main board (CN301)

6

• LOCATION OF CONTROLS

SECTION 2

GENERAL

CX-JN20/JN30

This section is extracted from
instruction manual.

Main unit: front

Refer to the pages indicated in parentheses for details.

1 DISC CHANGE

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 MODE

Selects various modes (ECO and Repeat/Shuffle/
Programmed playback, etc.) when used in combination
with ENTER and MULTI JOG.

4 ENTER

Fixes the modes and the time (ECO, Repeat/Shuffle/
Programmed playback, clock, and timer, etc.) when used
in combination with ENTER and MULTI JOG.

5 MULTI JOG

When used in combination with ENTER and MULTI JOG,
CD: selects a track and Repeat/Shuffle/Programmed
playback.
Tuner: selects a preset station.
Tape: specifies tape length.
Clock and Timer: sets the time.
i-Bass: selects a frequency range.
Spectrum analyzer, ECO and Dimmer: selects the mode.

6 PHONES jack

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

7 SYNC DUB

Starts dubbing a whole tape.

wREC/REC MUTING

Starts recording.

8 DISC DIRECT PLAY 1-3

Selects a disc.

9 zOPEN/CLOSE

Opens or closes the disc compartment.

0 TA PE A/B

Selects Tape function, and deck A or B.

TUNER/BAND

Selects Tuner function and the radio band.

VIDEO/AUX

Selects the function of external equipment connected to
VIDEO/AUX jacks.

CD

Selects CD function.

! Remote sensor

Receives a signal from the remote.

@ VO LUME

Adjusts the volume.

# TREBLE

Enhances high frequency sound.

$ cPLAY/PRESET

When the unit is turned off: activates or deactivates
DEMO.
CD and Tape: starts playback.
Tuner: tunes into a preset station.

sSTOP/CLEAR

CD and Tape: stops playback.
Tuner: clears a station preset.

f TUNING DOWN, g TUNING UP

CD: searches a track in fast forwar d or fast reverse
playback when held down.
Tape: fast forwards or rewinds the tape.
Tuner: manually tunes down or up within the band.

aPAU SE/SET

CD and Tape: pauses playback.
Tuner: stores the received station in to preset.

% BASS

Emphasizes low frequency sound.

^ i-Bass

Produces rich and clear low frequency sound.

& DISPLAY

Displays the time and the remaining time for CD.

ALBUM k, i

Selects a previous album or a succeeding album with
MP3-CDs.

PTY (CX-JN20/JN30: AEP, UK)

Displays a program type for RDS (Radio Data System)

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/AUX 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/AUX.

Tip:

To change the displayed name for this function, turn the
unit on, then hold down VIDEO/AUX and press POWER
on the unit. Repeat the procedure to select "VIDEO",
"AUX" or "TV".

3 # SPEAKER terminals

Connect the speaker cord of the supplied front speakers
here.

4 AC power cord

7

CX-JN20/JN30

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

CD: selects a CD track of the specified number.
Tuner: tunes in to the station with the specified preset
number.

The numbered buttons take on these functions below when pressed
with SHIFT held down

EDIT

Enters AI Edit Recording or Programmed Edit Recording
mode when pressed in stop mode.

BAND

Selects Tuner function and the radio band.

TAPE A/B

:

SPECTRUM

Changes the spectrum analyzer display.

TUNER MODE

Switches between stereo or monaural FM reception.

3 r,t

CD: selects a track.
Tuner: selects a preset station.
Tape: specifies tape length.
BASS 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

Selects Shuffle or Programmed playback in CD function.

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
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 (AUX or TV).

0 DISC SKIP

Select a disc.

! c/d

When the unit is turned off: activates or deactivates
DEMO.
CD and Tape: starts playback.

s

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.

a

CD and Tape: pauses playback.

@ SLEEP

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

# VOLUME (+, -)

Adjusts the volume.

$ SOUND

Selects BASS or TREBLE setting mode

CLEAR

Clears a track of the CD programmed playback and a
Radio preset station.

Note

The button not explained above (KARAOKE) does not
operate for this unit.

Setting the clock

Use the remote.

1

Press CLOCK/TIMER/SET.

Go to step 3 when the time appears and the 'hour' flashes.

2

Press r or t repeatedly until "CLOCK
SET" appears in the display and then press

ENTER.

3

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

4

Press r or t repeatedly to set the minute
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 display the time

Press DISPLAY on the remote. The time will be displayed for
6 seconds.

If "- -:- -" appears when the unit is turned off

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

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-JN20/JN30

SECTION 3

DISASSEMBLY

3-3. CASE (TOP)

(Page 10)

3-5. CD MECHANISM DECK

(CDM74S-K6BD71A)
(Page 11)

3-6. FRONT PANEL

SECTION
(Page 12)

3-7. MECHANICAL

DECK
(CWM43FF13)
(Page 12)

3-4. TRAY PANEL

3-8. REAR CABINET

3-9. PT BOARD,

(Page 11)

SECTION
(Page 13)

MAIN BOARD
(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-K6BD71A)
(Page 15)

3-14. MOTOR GEAR ASSY (SLED) (M701),

BD BOARD
(Page 16)

9

CX-JN20/JN30

s

w

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

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

5

case (side-L)

1

two case screws

3

2

two screws
(BVTP3

×

10)

2

two screws
(BVTP3

×

10)

1

case screw

3-3. CASE (TOP)

4

case (top)

4

2

claw

3

1

3

4

case screw

1

5

case (side-R)

1

two screws
(BVTP3 × 10)

two case screw

10

2

claw

2

cla

2

claw

3-4. TRAY PANEL

1

Turn the loading gear
in the direction of arrow

2

Pull-out the disc table.

A

four claws

3

CX-JN20/JN30

.

A

4

tray panel

3-5. CD MECHANISM DECK (CDM74S-K6BD71A)

5

CD mechanism deck (CDM74S-K6BD71A)

3

screw

×

(BVTP3

10)

1

wire (flat type) (19 core)
(CN691)

2

connector
(CN701)

4

two screws
(BVTP3

×

10)

3

screw
(BVTP3

×

10)

11

CX-JN20/JN30

3-6. FRONT PANEL SECTION

3

4

screw
(BVWHTP)

HP board

1

screw
(BVTP3

2

×

10)

terminal

9

front panel section

3-7. MECHANICAL DECK (CWM43FF13)

4

6

connector
(CN301)

7

three screws
(BVTP3

mechanical deck (CWM43FF13)

×

10)

6

connector
(CN302)

5

wire (flat type) (11 core)
(CN694)

3

clamp

2

six screws
(BVTP3 × 10)

8

connector
(CN101)

12

5

ground mechanical plate

1

wire (flat type) (13 core)

3-8. REAR CABINET SECTION

1

wire (flat type) (15 core) (CN802)

3

rear cabinet section

2

2

CX-JN20/JN30

three screws
(BVTP3

screw
(BVTP3

×

×

10)

10)

3-9. PT BOARD, MAIN BOARD

3

screw

5

two screws

6

PT board

(BVTP3

×

10)

5

two screws

2

screw
(BVTT3 × 8)

1

connector (CN091)

4

Remove the PWB PT HLDR
in the direction of the arrow.

8

MAIN board

7

screw
(BV B3)

7

two screws
(BV B3)

13

CX-JN20/JN30

)

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

table (loading)

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-JN20/JN30

1

3-13. BASE UNIT (BU-K6BD71A)

belt (loading)

2

connector
(CN704)

8

base unit (BU-K6BD71A)

4

three insulators

3

three coil springs
(insulator)

2

three stoppers (BU)

1

threescrews
(BTTP M2.6)

7

insulator

6

coil spring
(insulator)

5

screw
(PTPWH M2.6)

15

CX-JN20/JN30

)

3-14. MOTOR GEAR ASSY (SLED) (M701), BD BOARD

7

gear (A)

6

claw

2

two screws

×

3)

(P2

qa

BD board

1

Remove two
solders.

8

gear (B)

5

wire (flat type) (16 core
(CN708)

0

motor gear assy (SLED)
(M701)

4

9

Remove two solders.

3

screw (P2.6 × 6)

16

SECTION 4

TEST MODE

CX-JN20/JN30

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. In the standby status, while pressing the x button, press the

[POWER] button.

2. The set is reset, then becomes standby status.

GC TEST MODE

Procedure:

1. Press the [POWER] button to turn the power on.

2. While pressing the x button, press the [POWER] button for

5 seconds.

3. It change displays in order of model type, version and suffix at

2 seconds interval, then the display is back to normal status.

AMP TEST MODE

Procedure:

1. In the status where AC plug is disconnected, while pressing

the [VIDEO/AUX] button, connect the AC plug to turn the
power on. Then enter the AMP test mode and display “AMP
TEST”.

2. If turn the [VOLUME] knob clockwise, it displays “V OLUME

MAX”, and if turn the knob counterclockwise, it displays
“VOLUME 0”.

3. If the [TREBLE] and [BASS] knobs are turned clockwise or

counterclockwise, it change displays in order of “EQ MAX”,
“EQ MIN” and “EQ FLAT”.

4. To release from this mode, disconnect the AC plug and turn

the power off.

FUNCTION CHANGE MODE

• Select either TV, VIDEO or AUX (MD) of the external function
input.

Procedure:

1. Press the [POWER] button to turn the power on.

2. While pressing the [VIDEO/AUX] button, press the [POWER]

button.

3. Each time this operation is operated, it change displays in or-

der of “TV”, “VIDEO” and “AUX”.

DISC TRAY LOCK

Procedure:

1. Press the [POWER] button to turn the power on.

2. While pressing the x button, press the OPEN/CLOSE Z
button for 5 seconds.

3. The message “LOCKED” is displayed and the tray is locked.
(Even if exiting from this mode, the tray is still locked)

4. To release this lock, while pressing the x button, press
the OPEN/CLOSE Z button for 5 again.

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

CD REPEAT 5 LIMIT CANCEL MODE

• Number of repeat for CD playback is 5 times when the repeat

mode is “REPEAT”. This mode enables CD to repeat playback
for limitless times.

Procedure:

1. Press the [POWER] button to turn the power on.

2. In the repeat on status, while pressing the x button, press the

[CD] button to enter the CD repeat 5 limit cancel mode and

repeat mark blinks on the fluorescent indicator tube.

3. To release this mode, press the [POWER] button to turn the
power off.

17

CX-JN20/JN30

CD TEST MODE

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

Procedure:

1. In the status where AC plug is disconnected, while pressing

the [CD] button, connect the AC plug to turn the power on.

2. When enter this mode, it displays “CD TEST” and few sec-

onds later, all segments turn on of the fluorescent indicator
tube.

3. To release fr om this mode, disconnect the AC plug and turn

the power off.

In this mode, it operates as following table.

Button Operation Purpose of use

M Move the pick-up to outside track Sled circuit check
m Move the pick-up to inside track Tracking circuit check

Mechanism operation check
Optical pick-up check

N Playback a CD Servo block check

If it cannot focus on, it continuous focus search

x When playback a CD: stop playback APC circuit check

When stop a CD: Laser current measure
display “READING” (blink) Focus search waveform check
continuous laser diode on Tracking balance check
continuous focus search (not made focus on)

X Pause, Tracking servo off

(ignore CLV error)

18

SECTION 5

p

p

ELECTRICAL ADJUSTMENTS

CX-JN20/JN30

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

A

±

within 3

B

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 (RF)

IC721

TP (VC)
TP (FE)

1919

CX-JN20/JN30

6-1. BLOCK DIAGRAM – CD Section –

OPTICAL PICK-UP

(KSM-213DCP)

DETECTOR

A

B

LASER DIODE

PD

BLOCK

D

C

E

F

SECTION 6

DIAGRAMS

CD DSP

IC721

A

D

C

I-V AMP

B

E

F

LD

LD

PD

AUTOMATIC

POWER CONTROL

Q701

FIN2

8

RF

PH, BH

A/D

CONVERTER

SERVO

PROCESSOR

D/A

CONVERTER

4

APC

TBAL

EQ,

AGC

RF AMP

FIN1

7

TIN1

9

TIN2

10

LDD

80

LDS

79

EFMIN

3

ERROR

CORRECT

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

42

45

57
56
55

60
59
58

53
52
50

26MP3RES

54

49

48

16.9344MHz

X701

R-CH

2ADDATA
3ADBCK
4ADLRCK

79 DATAIN
80 DATACK

1LRSY

5C2FIN
9CKOUT

78 RESB

7CKIN

73 CMDOUT
74 CMDIN
75 CL

MP3 DECODER

IC801

CE

FSYNC

76 66

MDATA0

– MDATA15

MADRS0

– MADRS8

23-30, 33-4060-53, 50

MEMORY

2-5, 7-10,

35-38, 40-43

A0 – A8

18-21, 24-28

29 OE45OEB
15 WE42WEB
16 RAS41RASB
31 LCAS43CASLB
30 UCAS44CASUB

IC802

I/O1 – I/O16

CD

(Page 22)

A

2-AXIS
DEVICE

(FOCUS)

(TRACKING)

M701

(SLED)

M702

(SPINDLE)

106

DO

64

DI

63

WRQ

CL

62

CE

61
65

67DRF
66RES

S701

(LIMIT IN)

SLED/SPINDLE MOTOR DRIVE,
FOCUS/TRACKING COIL DRIVE

VO3 (+)

18
17 VO3 (–)

11 VO2 (+)
12 VO2 (–)

IC722

FOIN

20TIN

10

70 LIMIT SW

TDO

FDO23SLDO22SPDO25CONT4

20

21

COMMAND
INTERFACE

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

• SIGNAL PATH

M

M

26 VO4 (+)

27 VO4 (–)

2 VO1 (+)

1 VO1 (–)

25SLIN

3SPIN

7MUTE

: CD PLAY

99 CD DO
98 CD DI

100 CD CLK

5CD CE

97 CD WRQ

95 CD DRF

4CD RESET

M751

(LOADING)

M741

(TABLE)

MP3 CE

MP3 SYNC

SYSTEM CONTROLLER

IC901 (1/2)

LOADING MOTOR DRIVE

M

M

4 OUT1

2 OUT2

TABLE MOTOR DRIVE

4 OUT1

2 OUT2

IC701

IC712

1SYS-MUTE
94POWER
27HOLD

11RESET
18POWER DOWN

74CD NUMBER SENS

20CD BUSY

7FIN

9RIN

7FIN

9RIN

MUTE

POWER

HOLD

RESET

P-DOWN

LEVEL SHIFT

Q731

+

LM-F

LM-R

TM-F

TM-R

OPEN

CLOSE

ROTARY

ENCODER

S711

TABLE ADDRESS

OPEN/CLOSE

P-DOWN

SENSOR

IC731

DISC TRAY

ADDRESS DETECT

S751

DETECT

LM-L, LM-R,

TM-L, TM-R

MUTE,

POWER,

HOLD

RESET,

B

C

D

(Page 22)

(Page 22)

(Page 22)

2020

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

TUNER PACK

(Page 22)

H

FM 75Ω
(COAXIAL)

AM LOOP

SPEANA

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

• SIGNAL PATH

: TUNER (FM/AM)

: TAPE PLAY (DECK-A)

: TAPE PLAY (DECK-B)

: REC

FM ANT

AM ANT

L-CH

R-CH

DO

DI
CL
CE

TUNED

STEREO

MUTE

RDS DATA

RDS INT

FM-SOUT

(JN20/JN30: AEP, UK)

R-CH

DATA

IFC

CLK

PLL-CE

TUNED

STEREO

TU-MUTE

RDS-DATA

RDS-CLK

RDS-SIG

SPEANA AMP

Q201, 202

MULTI JOG

S301 – 323

(FRONT PANEL KEY)

VOLUME

TREBLE

BASS

TU

(Page 22)

E

DATA
IFC
CLK
PLL-CE
TUNED
STEREO
TU-MUTE

RDS-DATA
RDS-CLK

RDS-SIG

(JN20/JN30: AEP, UK)

BAND-PASS

FILTER

Q204 – 206

ROTARY

ENCODER

S801

ROTARY

ENCODER

S803

ROTARY

ENCODER

S802

ROTARY

ENCODER

S804

REMOTE CONTROL

RECEIVER

IC801

DATA

CLK

SYSTEM CONTROLLER

3TU/EVOL DO
96 TU DI
88 CLK

9TU CE
75 TUNED
76 STEREO
85 TUNER MUTE

2RDS DO
28 RDS CLK

19 TU-SIG/MIC

21 SPEANA-L
22 SPEANA-M
23 SPEANA-H

77 VOL A
78 VOL B

81 TRE A
82 TRE B

83 BASS A
84 BASS B

79 JOG A
80 JOG B

KEY1 –

KEY3

26 – 24

29 RMC

IC901 (2/2)

LCK

XT1

CF1

CF2

KEYSCAN

A PHOTO/S6
B PHOTO/S7

A HALF/S12
B HALF/S10

A MODE/S13

B MODE/S9

REC FWD/S11

REC REV/S8

S14 – S25

S1 – S5,

S26 – S30

G1 – G11

8

1312XT2

15

16

93POWER LED

92

47
48
54
52
55
50
53
49

56-6730-40

41-45,

S12
S10
S13

S11

68-71, 73

HP1
(PB)

(DECK-A)

HRPE1

(REC/PB/ERASE)

(DECK-B)

X901

32.768kHz

X902

8.64MHz

1 STANDBY/ON

S6
S7

S9

S8

L-CH

R-CH R-CH

L-CH

R-CH R-CH

ERASE

CLK

DATA

LED901

D620 – 627

S6 – S13

LCK

S-OUT

LED201

i-BASS

B+ SWITCH

B+

FL901

FLUORESCENT

INDICATOR TUBE

Q607

MUTING

Q305

MUTING

Q307, 309

PB SWITCH

Q301

PB SWITCH

Q303

18

SO

5 LCK

3DATA
4 CLK

11 V-BASS

MOTOR/PLUNGER DRIVE,

+3.3V

Q601

6

PB2

O-MOTOR

LED DRIVE

IC201

R-CH

O-BIAS

SOL A

SOL B

BIAS OSC

L311

7

8

9

10

PB

REC

BIAS OSC

Q310

CAPSTAN/REEL

MOTOR DRIVE

Q601, 604

PLUNGER DRIVE

(DECK-A)

Q602, 605

PLUNGER DRIVE

(DECK-B)

Q603, 606

REC BIAS

SWITCH

Q311, 312

S6
S7
S12
S10
S13
S9
S11
S8

CX-JN20/JN30

PB,
REC

B+

(CD-VM)

DATA, CLK,

S-OUT, LCK

TAPE MECHANISM

DECK BLOCK

CAPM+

MM

(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 (REV)

F

G

(Page 22)

(Page 22)

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