Aiwa CX-JV4 User manual

SERVICE MANUAL
COMPACT DISC DECK RECEIVER
E Model
CX-JV4
Ver 1.2 2004.08
9-961-182-03 Sony Corporation
2004H05-1 Personal Audio Company
© 2004.08 Published by Sony Engineering Corporation
SPECIFICATIONS
CX-JV4 is the tuner, amplifier, cassette deck and
disc player section in JAX-V4.
Model Name Using Similar Mechanism CX-JV5
CD CD Mechanism Type CDM74B-30BD61S
Section Base Unit Name BU-30BD61S
Optical Pick-up Name OP Assy (A-MAX.3)
Tape deck Model Name Using Similar Mechanism CX-JV5
Section Tape Transport Mechanism Type CWM43FR16
TUNER
FM tuning range 87.5 MHz to 108 MHz
FM usable sensitivity (IHF) 13.2 dBf
FM antenna terminal 75 ohms (unbalanced)
AM tuning range
Middle Eastern model: 531 kHz to 1602 kHz (9 kHz step)
Other models: 530 kHz to 1710 kHz (10 kHz step)
531 kHz to 1602 kHz (9 kHz step)
AM usable sensitivity 350 µV/m
AM antenna Loop antenna
AMPLIFIER
Power output Rated: 80 W + 80 W (1 kHz, T.H.D.
1 %, 6 ohms)
Reference: 100 W + 100 W (1 kHz,
T.H.D. 10 %, 6 ohms)
Total harmonic distortion 0.08 % (20 W, 1 kHz, 6 ohms, DIN
AUDIO)
Input VIDEO/AUX: 1.2 V
Outputs FRONT SPEAKER: 6 ohms or more
SURROUND SPEAKER (JAX-V5
only): 8 ohms or more
PHONES: 32 ohms or more
REC OUT: 0.775 V
VIDEO OUT: 1 Vp-p (75 ohms)
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
DISC PLAYER
Laser Semiconductor laser (λ= 795 nm)
Emission duration:
continuous
D/A converter 1 bit dual
Signal-to-noise ratio 90 dB (1 kHz, 0 dB)
Harmonic distortion 0.05 % (1 kHz, 0 dB)
Video signal NTSC/PALcolorsystem(selectable)
Video data MPEG1
Audio data MPEG1, Layer2 (VIDEO CD)
MPEG1, Layer3 (MP3-CD)
GENERAL
Power requirements
110-120V/220-240VAC(Switchable),
50 Hz/60 Hz
Power consumption 130 W
Power consumption With ECO mode on: 0.25 W
in standby mode With ECO mode off: 25 W
Dimensions (W x H x D) 280 x 330 x 392.5 mm
Weight 8.1 kg
Specificationsand externalappearanceare subjecttochange
without notice.
COPYRIGHT
Checkcopyrightlawsrelevanttorecordingsfromdiscs,tuner
or tape for the country where the unit is to be used.
Licensed by BBE Sound, Inc. under USP4638258, 5510752
and 5736897.

CX-JV4
2
Notes on chip component replacement
•Never reuse a disconnected chip component.
•Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Flexible Circuit Board Repairing
•Keep the temperature of the soldering iron around 270 ˚C dur-
ing repairing.
•Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
•Be careful not to apply force on the conductor when soldering
or unsoldering.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED
LINE WITH MARK 0ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
The following caution label is located inside the apparatus.
This appliance is classified as
a CLASS 1 LASER product.
This marking is located on
the rear exterior.

CX-JV4
3
TABLE OF CONTENTS
1. SERVICING NOTES ................................................ 4
2. GENERAL
Location of Controls ....................................................... 7
3. DISASSEMBLY
3-1. Disassembly Flow ........................................................... 9
3-2. Case (SIDE-L/R)............................................................. 10
3-3. Case (Top) ....................................................................... 10
3-4. Tray Panel........................................................................ 11
3-5. CD Mechanism Deck (CDM74B-30BD61S) ................. 11
3-6. Front Panel Section ......................................................... 12
3-7. Mechanical Deck (CWM43FR16).................................. 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-30BD61S) .............................................. 15
3-14. BD Board......................................................................... 16
4. TEST MODE.............................................................. 17
5. ELECTRICAL ADJUSTMENTS
CD Section ...................................................................... 18
6. DIAGRAMS
6-1. Block Diagram – CD SERVO Section – ....................... 21
6-2. Block Diagram – AUDIO/VIDEO Section – ................ 22
6-3. Block Diagram – TUNER/TAPE/PANEL Section –..... 23
6-4. Block Diagram –AMP/POWER SUPPLY Section – ... 24
6-5. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 25
6-6. Printed Wiring Board – BD Section – ........................... 26
6-7. Schematic Diagram – BD Section –.............................. 27
6-8. Printed Wiring Boards – CHANGER Section –............ 28
6-9. Schematic Diagram – CHANGER Section – ................ 29
6-10. Schematic Diagram – VMP Section (1/2) – .................. 30
6-11. Schematic Diagram – VMP Section (2/2) – .................. 31
6-12. Printed Wiring Board – VMP Section – ........................ 32
6-13. Printed Wiring Boards – MAIN Section – .................... 33
6-14. Schematic Diagram – MAIN Section (1/4) –................ 34
6-15. Schematic Diagram – MAIN Section (2/4) –................ 35
6-16. Schematic Diagram – MAIN Section (3/4) –................ 36
6-17. Schematic Diagram – MAIN Section (4/4) –................ 37
6-18. Printed Wiring Boards – VF/HP Section – .................... 38
6-19. Schematic Diagram – VF/HP Section – ........................ 39
6-20. Printed Wiring Board – PANEL Section – .................... 40
6-21. Schematic Diagram – PANEL Section – ....................... 41
6-22. Printed Wiring Boards – KEY Section – ....................... 42
6-23. Schematic Diagram – KEY Section – ........................... 43
6-24. Printed Wiring Board – PT Section – ............................ 44
6-25. Schematic Diagram – PT Section –............................... 45
6-26. IC Pin Function Description ........................................... 52
7. EXPLODED VIEWS
7-1. Case Section .................................................................... 60
7-2. Front Panel Section-1...................................................... 61
7-3. Front Panel Section-2...................................................... 62
7-4. Front Panel Section-3...................................................... 63
7-5. Front Panel Section-4...................................................... 64
7-6. Chassis Section ............................................................... 65
7-7. CD Mechanism Deck Section-1 (CDM74-30BD61S) ... 66
7-8. CD Mechanism Deck Section-2 (CDM74-30BD61S) ... 67
7-9. CD Mechanism Deck Section-3 (CDM74-30BD61S) ... 68
7-10. Base Unit Section (BU-30BD61S) ................................. 69
8. ELECTRICAL PARTS LIST ............................... 70

4
CX-JV4
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
•Unleaded solder melts at a temperature about 40 ˚C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 ˚C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
•Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges oc-
cur such as on IC pins, etc.
•Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
SECTION 1
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the “S curve check” in “CD section adjustment” and
check that the S curve waveforms is output three times.
RELEASING THE DISC TRAY LOCK
The disc tray lock function for the antitheft of an demonstration
disc in the store is equipped.
Releasing Procedure :
While pressing the xkey, press the ZOPEN/CLOSE 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.

5
CX-JV4
HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH TURNS OFF.
3 Pull-out the disc tray.
1 Remove the case (side-L).
2 Turn the loading gear in the direction of arrow A .
A

6
CX-JV4
SERVICE POSITION
– CD mechanism deck –
–Tape mechanism deck –
main board (CN691)
Connect wire (flat type) (19 core) to
main board (CN691) and VMP50 board (CN801).
VMP50 board (CN801)
Connect wire (flat type) (13 core) to
panel board (CN601) and mechanical deck.
panel board (CN601)
main board (CN301)

7
CX-JV4
SECTION 2
GENERAL This section is extracted from
instruction manual.
•LOCATION OF CONTROLS
1DISC CHANGE
Rotates the CD trays.
2POWER 6STANDBY/ON
Switches the unit on and off (standby).
The red indicator flashes when receiving a signal from
the remote.
3MODE
Selects various modes (ECO and Repeat/Shuffle/
Programedplayback,etc.)whenusedincombinationwith
ENTER and MULTI JOG.
4ENTER
Fixes the modes and the time (ECO, Repeat/Shuffle/
Programed playback, clock, and timer, etc.) when used
in combination with ENTER and MULTI JOG.
5MULTI JOG
WhenusedincombinationwithENTERandMULTIJOG,
CD: selects a track and Repeat/Shuffle/Programed
playback.
Tuner: selects a preset station.
Tape: selects a reverse mode and specifies tape length.
Clock and Timer: sets the time.
i-Bass: selects a frequency range.
Spectrumanalyzer,ECOandDimmer:selects the mode.
6MIC MIXING
Adjusts the microphone volume.
MIC jack
Connects the microphone here.
7PHONES jack
Plug in here an optional headphones set with a mini
stereo plug (ø3.5 mm). Speaker output is canceled.
Refer to the pages indicated in parentheses for details.
8SYNC DUB
Starts dubbing a whole tape.
wREC/REC MUTING
Starts recording.
9DISC DIRECT PLAY 1-3
Selects a disc.
0zOPEN/CLOSE
Opens or closes the disc compartment.
!TAPE A/B
Selects Tape function, and deck A or B.
TUNER/BAND
Selects Tuner function and the radio band.
VIDEO/AUX
Selectsthe function of external equipment connected to
VIDEO/AUX jacks.
CD
Selects CD function.
@Remote sensor
Receives a signal from the remote.
#VOLUME
Adjusts the volume.
$TREBLE
Enhances high frequency sound.
%dDIR (TAPE B)/PRESET
When the unit is turned off: activates or deactivates
DEMO.
CD and Tape: starts playback.
Tuner: tunes into a preset station.
sSTOP/CLEAR/vRETURN
18, 20, 24)
CD and Tape: stops playback.
Tuner: clears a station preset.
fTUNING DOWN, gTUNING UP
CD: searches a track in fast forward or fast reverse
playback when held down.
Tape: fast forwards or rewinds the tape.
Tuner: manually tunes down or up within the band.
aPAUSE/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 -, +
Selects a previous album or a succeeding album with
MP3-CDs.
Refer to the pages indicated in parentheses for details.
1NTSC/AUTO/PAL switch
Sets the color system of the video signal output via the
VIDEO OUT jack. Turn off the power, and then set the
switch according to your TV set;
- PAL: When connecting to a PAL system TV.
- NTSC: When connecting to a NTSC system TV.
- AUTO: When connecting to a multi color system TV.
• In case of setting the switch to "AUTO", you need to
adjust the color system according to your VCD to play
back.HolddownCDbuttonforabout6secondsinstop
mode in CD function, and "PAL" (initial) or "NTSC"
appearsonthedisplay(exceptwhen the loaded disc is
MP3-CD).
When playing back a PAL VCD, hold down CD and
release it when "PAL" appears.
WhenplayingbackaNTSCVCD,dothesameprocedure
and release it when "NTSC" appears.
When the function is changed or the unit is turned off,
PAL is resorted.
• This unit does not support color systems other than
PAL and NTSC, such as NTSC 4.43 or SECAM.
•Ifthereis a color or picturetroubleintheAUTOmode,
select NTSC or PAL.
2AM LOOP, FM 75 Ωterminals
Plug in the supplied AM and FM antennas here.
3VIDEO/AUX jacks
Acceptsanalogsoundsignals from externalequipment.
Connect using an optional connecting cable with RCA
phono plugs (red plug to R jack, white plug to L jack).
Referalsototheoperatinginstructionsofyourequipment.
To switch function to external input, press VIDEO/AUX.
Tip:
To changethedisplayedname for this function, turnthe
unit on, then hold down VIDEO/AUX and press POWER
on the unit. Repeat the procedure to select "VIDEO",
"AUX" or "TV".
REC OUT jacks
Outputs analog sound signals to external equipment.
Connect using an optional connecting cable with RCA
phono plugs (red plug to R jack, white plug to L jack).
Referalsototheoperatinginstructionsofyourequipment.
When the function is set to "VIDEO", "AUX" or "TV",
no signal is output from the REC OUT jacks.
4#SPEAKER terminals
Connectthespeakercord of thesuppliedfrontspeakers
here.
5VIDEO OUT jack
Outputs video signals. Connect to the video input jack
of your TV set with the supplied video connecting cord.
Select the appropriate video input on your TV. Refer to
the operating instructions of your TV.
6AC voltage selector
Switches AC voltage according to your local voltage.
Make sure it matches your local voltage.
7AC power cord

8
CX-JV4
Buttons with the same or similar names as the main unit
basically have the same function.
1POWER
21-0/10, +10
CD: selects a CD track of the specified number.
Tuner: tunes in to the station with the specified preset
number.
Thenumberedbuttonstakeonthese functionsbelow whenpressed
with SHIFT held down:
EDIT/CHECK
Enters AI Edit Recording or Programed 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.
KARAOKE
Selects a Multiplex mode.
PLAY MODE
CD: selects Shuffle, Programmed playback, etc.
Tape: selects a reverse mode (deck B only)
REPEAT
Enters CD repeat playback mode.
SLEEP
Switchesthesleep-timeron/offandselectstheduration.
SOUND
Selects BASS or TREBLE setting mode
ECHO
Adjusts the echo level for CD function.
3r, t/PREV, NEXT/DIGEST, ZOOM
CD: selects a track.
Tuner: selects a preset station.
Tape: specifies tape length.
VCD: goes to the next/previous page or scene.
DIGEST: Activates the Digest playback function when
playback a VCD.
ZOOM: Enlarge VCD picture during pause.
BASS and TREBLE: adjusts the level.
Clock and Timer: sets the time.
4ALBUM -, +/KEY CONTROL ,
MP3: selects a previous album or a succeeding album.
CD: adjust the playback sound key for CD function
5PBC
Manually turns the PBC function on and off for a PBC
disc.
MARK
Marks a desired point when playing back a VCD.
ON SCREEN
Displaysdisc information such as the elapsed playback
time on the TV screen.
6CLOCK/TIMER/SET
Enters timer setting mode.
CLOCK/TIMER/SELECT
Selects timer playback, timer recording or timer off.
Refer to the pages indicated in parentheses for details.
7DISPLAY
8SHIFT
Holddown whenpressing anumberedbuttontochange
its function to that printed above the number.
e.g.)
"Press SHIFT+BAND on the remote" indicates "Hold
downSHIFTandpress'2'(BAND)".Doingsomakesyou
be able to select Tuner function and the radio band.
9FUNCTION
Switches the active function among CD, TAPE, TUNER
and VIDEO (AUX or TV).
0DISC 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.
@SLOW
Plays back a VCD slowly while held down.
#VOLUME +, -
Adjusts the volume.
$ENTER
CLEAR
ClearsatrackoftheCDprogramedplaybackandaRadio
preset station.
Use the remote.
1 Press CLOCK/TIMER/SET.
Gotostep3whenthetimeappearsandthe'hour'flashes.
2 Press ror trepeatedly until "CLOCK
SET " appears in the display and then press
ENTER.
3 Press ror trepeatedly to set the hour
and then press ENTER.
4 Press ror trepeatedly to set the minute
and then press ENTER.
Thetimedisplaystopsflashingandtheclock starts from
00 seconds.
•MULTI JOG is also available in place of ror t.
To display the time
Press DISPLAY. The time will be displayed for 6 seconds.
Tip:
"AM 12:00 " indicates midnight and " PM 12:00 " noon.
If "- -:- - " appears when the unit is turned off
There has been a power interruption. Reset the clock.

CX-JV4
9
• This set can be disassembled in the order shown below.
3-1. DISASSEMBLY FLOW
SECTION 3
DISASSEMBLY
Set
3-2. CASE
(SIDE-L/R)
(Page 10)
3-3. CASE (TOP)
(Page 10) 3-4. TRAY PANEL (Page 11)
3-6. FRONT PANEL
SECTION
(Page 12)
3-8. REAR CABINET
SECTION
(Page 13)
3-7. MECHANICAL
DECK
(CWM43FR16)
(Page 12)
3-9. PT BOARD,
MAIN BOARD
(Page 13)
3-14. BD BOARD
(Page 16)
3-13. BASE UNIT
(BU-30BD61S)
(Page 15)
3-10. TABLE ASSY
(Page 14)
3-11. MOTOR (TB)
BOARD
(Page 14)
3-12. MOTOR (LD)
BOARD
(Page 15)
3-5. CD MECHANISM DECK
(CDM74B-30BD61S)
(Page 11)
Note 1: The process described in can be performed in any order.
Note 2: Without completing the process described in , the next process can not be performed.

CX-JV4
10
3-3. CASE (TOP)
Note: Follow the disassembly procedure in the numerical order given.
3-2. CASE (SIDE-L/R)
1 case screw
1 case screw
3
3
4
4
5 case (side-L)
5 case (side-R)
2 two screws
(BVTP3
× 10)
2 two screws
(BVTP3
× 10)
1 two case screw
s
1 two case screws
3
4
case (top)
2 claw
2 cla
w
1 two screws
(BVTP3 × 10)
2 claw
2 claw

CX-JV4
11
3-4. TRAY PANEL
3-5. CD MECHANISM DECK (CDM74B-30BD61S)
5 CD mechanism deck
(CDM74B-30BD61S)
3 screw
(BVTP3
× 10)
4 three screws
(BVTP3 × 10
)
3 screw
(BVTP3 × 10)
1 wire (flat type)
(19 core) (CN801)
2 connector
(CN701)
4 tray panel
2 Pull-out the disc table.
1 Turn the loading gear
in the direction of arrow
A .
A
3
four claws

CX-JV4
12
3-6. FRONT PANEL SECTION
3-7. MECHANICAL DECK (CWM43FR16)
7 screw
(BVWHTP)
8 headphone board
9 front panel section
4 three screws
(BVTP3
× 10)
1 wire (flat type) (11 core)
(CN694)
3 connector
(CN301)
6 connector
(CN601)
5
2
connector
(CN302)
5 ground mechanical plate
2 six screws
(BVTP3
× 10)
1 wire (flat type) (13 core)
4 mechanical deck
(CWM43FR16)
3 clamp

CX-JV4
13
3-8. REAR CABINET SECTION
3-9. PT BOARD, MAIN BOARD
4 rear cabinet section
3 three screws
(BVTP3 × 10
)
3 screw
(BVTP3 × 10
)
1 wire (flat type) (11 core)
(CN801)
2 connector (CN504)
0 PT board
4 main board
8 Remove the PWB PT HLDR
in the direction of the arrow.
6 screw
(BVTT3
× 8)
1 screw (BVTT3 × 8)
7 screw
(BVTP3
× 10)
2 screw
(BVTP3
× 10)
3 harness
9 two screws
(ITC4
× 8)
9 two screws
(ITC4
× 8)
1 two screws
(BVTT3
× 8)
5 connector
(CN090) (EXCEPT TH)
(CN091) (TH)

CX-JV4
14
3-10. TABLE ASSY
3 wire (flat type) (5 core
)
(CN702)
4 hook
1 Turn the loading gear
in the direction of arrow
A .
A
5
two claws
2 Pull-out the table assy.
6 table assy
3-11. MOTOR (TB) BOARD
2 table (loading)
4 connector
(CN731)
1 screw
(PTPWH M2.6)
5 two screws
(BTTP M2.6)
6 motor (TB) boar
d
3 belt (table)

CX-JV4
15
3-12. MOTOR (LD) BOARD
3-13. BASE UNIT (BU-30BD61S)
2 connector
(CN704)
3 two screws
(BTTP M2.6)
4 motor (LD) board
1 belt (loading)
2 two screws
(PTPWH M2.6)
1 wire (flat type) (23 core)
(CN102)
1 wire (flat type) (9 core)
(CN105)
3 two coil springs
(insulator)
6 two coil springs
(insulator)
7 two insulators
(BU-30)
9 base unit
(BU-30BD61S)
8 two insulators (BU-30)
4 two screws
(BTTP M2.6)
5 two stoppers (BU)

CX-JV4
16
3-14. BD BOARD
BU-30BD61S assy
1 wire (flat type) (16 core
)
(CN101)
2 Remove two solders.
4 BD board
3 Remove two solders.

17
CX-JV4
SECTION 4
TEST MODE
[COLD RESET]
•The cold reset clears all data including preset data stored in the
RAM to initial conditions. Execute this mode when returning
the set to the customer.
Procedure:
1. In the standby status, while pressing the xkey, press the
[POWER] key.
2. The set is reset, then becomes standby status.
[GC TEST MODE]
Procedure:
1. Press the [POWER] key to turn the power on.
2. While pressing the xkey, press the [POWER] key for 5 sec-
onds.
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] key, connect theAC plug to turn the power
on. Then enter theAMP test mode and display “AMP TEST”.
2. If turn the [VOLUME] knob clockwise, it displays “VOLUME
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.
[DISC TRAY LOCK]
Procedure:
1. Press the [POWER] key to turn the power on.
2. While pressing the xkey, press the [ OPEN/CLOSE] key 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 xkey, press the
[ OPEN/CLOSE] key for 5 again.
5. The message “UNLOCKED” is displayed and the tray is un-
locked.
[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] key to turn the power on.
2. In the repeat on status, while pressing the xkey, press the
[CD] key to enter the CD repeat 5 limit cancel mode and re-
peat mark blinks on the fluorescent indicator tube.
3. To release this mode, press the [POWER] key to turn the power
off.
[TUNERTEST MODE]
Procedure:
1. In the status where AC plug is disconnected, while pressing
two keys of [POWER] and xsimultaneously, connect theAC
plug to turn the power on.
2. The massage “TUN TEST” is displayed on the fluorescent in-
dicator tube, and tuner test mode is set.
Z
Z
[CHANGE-OVER OF AM TUNER STEP BETWEEN
9 kHz AND 10 kHz]
•Astep ofAM channels can be changed over between 9 kHz and
10 kHz.
Procedure:
1. Press the [POWER] key to turn the power on.
2. While pressing the [TUNER] key, press the [POWER] key to
the display on fluorescent indicator tube changes to “AM 530
kHz” (10 kHz step) or “AM 531 kHz” (9 kHz step), and thus
the channel step is changed over.
[FUNCTION CHANGE MODE]
•Select either TV,VIDEO orAUX (MD) of the external function
input.
Procedure:
1. Press the [POWER] key to turn the power on.
2. While pressing the [VIDEO/AUX] key, press the [POWER] key.
3. Each time this operation is operated, it change displays in or-
der of “TV”, “VIDEO” and “AUX”.
[TC (TAPE CASSETTE) TEST MODE]
•This mode can be used for operation check of zero return sec-
tion and automatic REC/PLAY section.
Procedure:
1. In the status where AC plug is disconnected, while pressing
the [TAPE] key, connect the AC plug to turn the power on.
2. The massage “TC TEST” is displayed on the fluorescent indi-
cator tube, and TC (tape casette) test mode is set.
Zero Return Section:
Press the Mor mkey, tape is rewound to the position of
counter zero.
Automatic REC/PLAY Section:
Press the [REC] key
r
Tape is rewound to the position of counter zero
r
Tape recording starts
r
Press the x key
r
Tape recording stops
r
Tape is rewound to the position of counter zero
r
Tape playback starts

18
CX-JV4
RFDC signal waveform
Connecting Location: BD board (Conductor Side)
(See page 19)
CD SECTION
Note:
1. UseYEDS-18 disc (3-702-101-01) unless otherwise indicated.
2. Use an oscilloscope with more than 10MΩimpedance.
3. Clean the object lens by an applicator with neutral detergent when the
signal level is low than specified value with the following checks.
RFDC LEVEL CHECK
Connection:
Procedure:
1. Connectan oscilloscope to test point TP (RFDC) andTP(VC)
on the BD board.
2. Turn the power on.
3. Put the disc (YEDS-18) in to playback the number five track.
4. Confirm that oscilloscope waveform is clear and check RFDC
signal level is correct or not.
Note: A clear RFDC signal waveform means that the shape “◊” can be
clearly distinguished at the center of the waveform.
+
–
BD board
TP (RFDC)
TP (VC)
oscilloscope
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level: 0.6
± 0.15 Vp-p
RFAC LEVEL CHECK
Connection:
Procedure:
1. Connect an oscilloscope to test point TP (RFAC) and TP (VC)
on the BD board.
2. Turn the power on.
3. Put the disc (YEDS-18) in to playback the number five track.
4. Confirm that oscilloscope waveform is clear and check RFAC
signal level is correct or not.
Note: A clear RFAC signal waveform means that the shape “◊” can be
clearly distinguished at the center of the waveform.
RFAC signal waveform
Connecting Location: BD board (Conductor Side)
(See page 19)
+
–
BD board
TP (RFAC)
TP (VC)
oscilloscope
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level: 1.0
± 0.4 Vp-p
S-CURVE CHECK
Connection:
Procedure:
1. Connect an oscilloscope to test point TP (FE) and TP (VC)
on the BD board.
2. While depressing the key, insert an AC plug.
3. Put the disc (YEDS-18) in and press the key and actuate
the focus search. (actuate the focus search when disc table is
moving in and out)
4. Check the oscilloscope waveform (S-curve) is symmetrical
betweenA and B.And confirm peak to peak level within 2 ±1
Vp-p.
S-curve waveform
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: BD board (Conductor Side)
(See page 19)
+
–
BD board
TP (FE)
TP (VC)
oscilloscope
A
B
symmetry
within 2
± 1 Vp-p
bB
x
SECTION 5
ELECTRICAL ADJUSTMENTS

19
CX-JV4
Adjustment and Connecting Location: BD board
(Conductor Side)
ADJUSTMENT AFTER CD BASE UNIT (BU-30BD61S) IS
REPLACED
Perform the E-F Balance (1 track jump) adjustiment .
+
—
BD board
TP (TE)
TP (VC)
oscilloscope
Traverse Waveform
0V
B
level: 1.0 ± 0.5 Vp-p
Center of
the waveform
A (DC
voltage)
Traverse Waveform
0V
Tracking servo
Sled servo
ON
A (DC
voltage)
Tracking servo
Sled servo
OFF
6. Press the key. (The tracking servo and sledding servo
are turned ON)
Confirm A (DC voltage) at that tome is 0 V.
7. To release from this mode, turn the power off.
Notes: ¥Always move the optical pick-up to most inside track when
exiting from this mode. Otherwise, a disc will not be unloaded.
¥Do not run the sled motor excessively, otherwise the gear can
be chipped.
E-F BALANCE (1 TRACK JUMP) ADJUSTMENT
Connection:
Procedure:
1. Connect an oscilloscpe to test point TP (TE) andTP (VC) on
the BD board.
2. AC is put in pushing key to enter the CD test mode.
3. Put the disc (YEDS-18) in to playback the number five track.
4. Press the key. If it plays, press the key again.
(The tracking servo and the sledding servo are turned OFF)
5. Rotate RV101 on the BD board to adjust A (DC voltage) of
the center of the oscilloscope waveform becomes 0 V.
Adjustment and Connecting Location:
– BD BOARD (Conductor Side) –
bB
bB
bB
bB
IC101
TP7
(VC)
IC103
RV101
E-F Balance
(1 Track Jump)
Adjustment TP8
(RFAC)
TP6
(RFDC)
TP4
(FE)
TP2
(TE)

20
CX-JV4
MEMO