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CX-JN20/JN30
SERVICE MANUAL AEP Model
UK Model
Ver 1.2 2004.08
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 Mechanism Type CDM74S-K6BD71A
CD
Base Unit Name BU-K6BD71A
Section
Optical Pick-up Block Name KSM-213DCP
Optical Pick-up Name KSS-213D
Tape deck Model Name Using Similar Mechanism CX-JN3
Section Tape Transport Mechanism Type CWM43FF13
SPECIFICATIONS
TUNER CASSETTE DECK Weight CX-JN30
FM tuning range 87.5 MHz to 108 MHz Track format 4 tracks, 2 channels stereo 6.6 kg
FM usable sensitivity (IHF) 16.8 dBf Frequency response 50 Hz 8 kHz CX-JN20
FM antenna terminal 75 ohms (unbalanced) Recording system AC bias 6.5 kg
AM tuning range 531 kHz to 1602 kHz Heads Deck A: playback x 1
AM usable sensitivity 350 µV/m Deck B: recording/playback x 1, Specifications and external appearance are subject to change
AM antenna Loop antenna erase x 1 without notice.
AMPLIFIER CD PLAYER
Power output CX-JN30 Laser Semiconductor laser ( = 780 nm) COPYRIGHT
Rated: 32 W + 32 W (6 ohms, T.H.D. Emission duration: Check copyright laws relevant to recordings from discs, tuner
1 %, 1 kHz/DIN 45500) continuous or tape for the country where the unit is to be used.
Reference: 40 W + 40 W (6 ohms, D/A converter 1 bit dual
T.H.D. 10 %, 1 kHz/DIN 45324) Signal-to-noise ratio 85 dB (1 kHz, 0 dB) Licensed by BBE Sound, Inc. under USP4638258, 5510752
MUSIC POWER: 100 W +100 W Harmonic distortion 0.05 % (1 kHz, 0 dB) and 5736897.
CX-JN20
Rated: 20 W + 20 W (6 ohms, T.H.D. GENERAL
1 %, 1 kHz/DIN 45500) Power requirements 230 V AC, 50/60 Hz
Reference: 25 W + 25 W (6 ohms, Power consumption CX-JN30
T.H.D. 10 %, 1 kHz/DIN 45324) 65 W
MUSIC POWER: 50 W + 50 W CX-JN20
Total harmonic distortion 0.08 % (16 W, 1 kHz, 6 ohms, DIN 60 W
AUDIO) Power consumption With ECO mode on: 0.25 W
Input VIDEO/AUX: 400 mV in standby mode With ECO mode off: 15 W
Outputs SPEAKER: 6 ohms or more Dimensions (W x H x D) 280 x 330 x 392.5 mm
PHONES: 32 ohms or more
COMPACT DISC DECK RECEIVER
9-877-599-03 Sony Corporation
2004H05-1 Personal Audio Company
© 2004.08 Published by Sony Engineering Corporation
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 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.
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 PUB-
LISHED BY SONY.
2
CX-JN20/JN30
TABLE OF CONTENTS
1. SERVICING NOTES ................................................ 4 7. EXPLODED VIEWS
7-1. Case Section .................................................................... 45
2. GENERAL 7-2. Tape Deck Section .......................................................... 46
Location of Controls ....................................................... 7 7-3. Panel Board Section ........................................................ 47
7-4. Key Section ..................................................................... 48
3. DISASSEMBLY 7-5. Front Cabinet Section ..................................................... 49
3-1. Disassembly Flow ........................................................... 9 7-6. Chassis Section ............................................................... 50
3-2. Case (SIDE-L/R) ............................................................. 10 7-7. CD Mechanism Deck Section-1
3-3. Case (Top) ....................................................................... 10 (CDM74S-K6BD71A) .................................................... 51
3-4. Tray Panel ........................................................................ 11 7-8. CD Mechanism Deck Section-2
3-5. CD Mechanism Deck (CDM74S-K6BD71A) ................ 11 (CDM74S-K6BD71A) .................................................... 52
3-6. Front Panel Section ......................................................... 12 7-9. CD Mechanism Deck Section-3
3-7. Mechanical Deck (CWM43FF13) .................................. 12 (CDM74S-K6BD71A) .................................................... 53
3-8. Rear Cabinet Section ...................................................... 13 7-10. Base Unit Section (BU-K6BD71A) ............................... 54
3-9. PT Board, MAIN Board .................................................. 13
3-10. Table Assy ....................................................................... 14 8. ELECTRICAL PARTS LIST ............................... 55
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 Wiring Board BD Section ........................... 24
6-6. Schematic Diagram BD Section .............................. 25
6-7. Printed Wiring 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
3
CX-JN20/JN30
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 OPERA TION
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 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.
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
CX-JN20/JN30
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
3 Pull-out the disc tray.
5
CX-JN20/JN30
SERVICE POSITION
CD mechanism deck
main board (CN691)
Connect wire (flat type) (19 core) to
main board (CN691) and BD board (CN710).
BD board (CN710)
Tape mechanism deck
panel board (CN601)
main board (CN302)
Connect wire (flat type) (13 core) to main board (CN301)
panel board (CN601) and mechanical deck.
6
CX-JN20/JN30
SECTION 2 This section is extracted from
GENERAL instruction manual.
· LOCATION OF CONTROLS
Main unit: front 5 MULTI JOG # TREBLE
When used in combination with ENTER and MULTI JOG, Enhances high frequency sound.
Refer to the pages indicated in parentheses for details.
CD: selects a track and Repeat/Shuffle/Programmed $ cPLAY/PRESET
playback.
When the unit is turned off: activates or deactivates
Tuner: selects a preset station.
DEMO.
Tape: specifies tape length.
CD and Tape: starts playback.
Clock and Timer: sets the time.
Tuner: tunes into a preset station.
i-Bass: selects a frequency range.
Spectrum analyzer, ECO and Dimmer: selects the mode.
sSTOP/CLEAR
CD and Tape: stops playback.
6 PHONES jack Tuner: clears a station preset.
Plug in here an optional headphones set with a mini f TUNING DOWN, g TUNING UP
stereo plug (ø3.5 mm). Speaker output is canceled. CD: searches a track in fast forward or fast reverse
7 SYNC DUB playback when held down.
Starts dubbing a whole tape. Tape: fast forwards or rewinds the tape.
wREC/REC MUTING Tuner: manually tunes down or up within the band.
Starts recording. aPAUSE/SET
CD and Tape: pauses playback.
8 DISC DIRECT PLAY 1-3
Tuner: stores the received station in to preset.
Selects a disc.
1 DISC CHANGE % BASS
9 zOPEN/CLOSE
Rotates the CD trays. Emphasizes low frequency sound.
Opens or closes the disc compartment.
2 POWER 6STANDBY/ON ^ i-Bass
0 TAPE A/B
Switches the unit on and off (standby). Produces rich and clear low frequency sound.
Selects Tape function, and deck A or B.
The red indicator flashes when receiving a signal from
TUNER/BAND & DISPLAY
the remote. Displays the time and the remaining time for CD.
Selects Tuner function and the radio band.
3 MODE VIDEO/AUX ALBUM k, i
Selects various modes (ECO and Repeat/Shuffle/ Selects the function of external equipment connected to Selects a previous album or a succeeding album with
Programmed playback, etc.) when used in combination VIDEO/AUX jacks. MP3-CDs.
with ENTER and MULTI JOG. CD PTY (CX-JN20/JN30: AEP, UK)
4 ENTER Selects CD function. Displays a program type for RDS (Radio Data System)
Fixes the modes and the time (ECO, Repeat/Shuffle/ ! Remote sensor
Programmed playback, clock, and timer, etc.) when used Receives a signal from the remote.
in combination with ENTER and MULTI JOG.
@ VOLUME
Adjusts the volume.
Main unit: rear 1 AM LOOP, FM 75 terminals
Plug in the supplied AM and FM antennas here.
Refer to the pages indicated in parentheses for details.
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 SPECTRUM 0 DISC SKIP
Changes the spectrum analyzer display. Select a disc.
Refer to the pages indicated in parentheses for details.
TUNER MODE ! c/d
Switches between stereo or monaural FM reception. When the unit is turned off: activates or deactivates
3 r, t DEMO.
CD and Tape: starts playback.
CD: selects a track.
Tuner: selects a preset station. s
Tape: specifies tape length. CD and Tape: stops playback.
BASS and TREBLE: adjusts the level. f,g
Clock and Timer: sets the time.
CD: searches a track in fast forward or fast reverse
4 ALBUM M, N playback when held down.
Selects a previous album or a succeeding album. Tape: fast forwards or rewinds the tape.
5 PLAY MODE Tuner: manually tunes down or up within the band.
Selects Shuffle or Programmed playback in CD function. a
REPEAT CD and Tape: pauses playback.
Enters CD repeat playback mode. @ SLEEP
ENTER Switches the sleep-timer on/off and selects the duration.
Buttons with the same or similar names with the main unit
# VOLUME (+, -)
basically have the same function. 6 CLOCK/TIMER/SET
Adjusts the volume.
1 POWER Enters timer setting mode.
$ SOUND
2 1-0/10, +10 CLOCK/TIMER/SELECT
Selects BASS or TREBLE setting mode
CD: selects a CD track of the specified number. Selects timer playback, timer recording or timer off.
CLEAR
Tuner: tunes in to the station with the specified preset 7 DISPLAY
number. Clears a track of the CD programmed playback and a
8 SHIFT Radio preset station.
The numbered buttons take on these functions below when pressed Hold down when pressing a numbered button to change
with SHIFT held down: its function to that printed above the number.
Note
EDIT e.g.)
"Press SHIFT+BAND on the remote" indicates "Hold The button not explained above (KARAOKE) does not
Enters AI Edit Recording or Programmed Edit Recording
down SHIFT and press '2' (BAND)". Doing so makes you operate for this unit.
mode when pressed in stop mode.
be able to select Tuner function and the radio band.
BAND
Selects Tuner function and the radio band. 9 FUNCTION
Switches the active function among CD, TAPE, TUNER
TAPE A/B and VIDEO (AUX or TV).
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
CX-JN20/JN30
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)
3-3. CASE (TOP) 3-4. TRAY PANEL
(Page 10) (Page 11)
3-5. CD MECHANISM DECK
(CDM74S-K6BD71A)
(Page 11)
3-6. FRONT PANEL 3-8. REAR CABINET 3-10. TABLE ASSY 3-13. BASE UNIT
SECTION SECTION (Page 14) (BU-K6BD71A)
(Page 12) (Page 13) (Page 15)
3-7. MECHANICAL 3-9. PT BOARD, 3-11. MOTOR (TB) 3-14. MOTOR GEAR ASSY (SLED) (M701),
DECK MAIN BOARD BOARD BD BOARD
(CWM43FF13) (Page 13) (Page 14) (Page 16)
(Page 12)
3-12. MOTOR (LD)
BOARD
(Page 15)
9
CX-JN20/JN30
Note: Follow the disassembly procedure in the numerical order given.
3-2. CASE (SIDE-L/R)
5 case (side-L) 2 two screws
(BVTP3 × 10)
1 two case screws
2 two screws
(BVTP3 × 10)
3
4
1 two case screws
1 case screw
3
4
5 case (side-R)
1 case screw
3-3. CASE (TOP)
1 two screws
(BVTP3 × 10)
2 claw
4 case (top)
3
2 claw
2 claw
2 claw
10
CX-JN20/JN30
3-4. TRAY PANEL
1 Turn the loading gear
in the direction of arrow A.
A
2 Pull-out the disc table.
3 four claws
4 tray panel
3-5. CD MECHANISM DECK (CDM74S-K6BD71A)
5 CD mechanism deck
(CDM74S-K6BD71A)
1 wire (flat type) (19 core)
(CN691)
2 connector
(CN701)
3 screw
(BVTP3 × 10) 4 two screws
(BVTP3 × 10)
3 screw
(BVTP3 × 10)
11
CX-JN20/JN30
3-6. FRONT PANEL SECTION
1 screw
(BVTP3 × 10)
2 terminal
3 screw
(BVWHTP)
4 HP board
8 connector
(CN101)
5 wire (flat type) (11 core)
(CN694)
6 connector
(CN302)
6 connector
(CN301)
9 front panel section
7 three screws
(BVTP3 × 10)
3-7. MECHANICAL DECK (CWM43FF13)
3 clamp
4 mechanical deck
(CWM43FF13) 2 six screws
(BVTP3 × 10)
5 ground mechanical plate
1 wire (flat type) (13 core)
12
CX-JN20/JN30
3-8. REAR CABINET SECTION
3 rear cabinet section
1 wire (flat type) (15 core) (CN802)
2 three screws
(BVTP3 × 10)
2 screw
(BVTP3 × 10)
3-9. PT BOARD, MAIN BOARD
3 screw
(BVTP3 × 10)
2 screw
5 two screws
5 two screws (BVTT3 × 8)
1 connector (CN091)
6 PT board
4 Remove the PWB PT HLDR
7 screw
in the direction of the arrow.
(BV B3)
8 MAIN board
7 two screws
(BV B3)
13
CX-JN20/JN30
3-10. TABLE ASSY
5 two claws
A
4 hook
3 wire (flat type) (5 core)
(CN702)
2 Pull-out the table assy. 1 Turn the loading gear
6 table assy in the direction of arrow A.
3-11. MOTOR (TB) BOARD
1 screw
(PTPWH M2.6)
2 table (loading)
3 belt (table)
6 MOTOR (TB) board
4 connector
(CN731)
5 two screws
(BTTP M2.6)
14
CX-JN20/JN30
3-12. MOTOR (LD) BOARD
3 two screws
(BTTP M2.6)
4 MOTOR (LD) board
2 connector
(CN704)
1 belt (loading)
3-13. BASE UNIT (BU-K6BD71A)
8 base unit
(BU-K6BD71A)
4 three insulators
7 insulator
3 three coil springs
(insulator)
6 coil spring
2 three stoppers (BU) (insulator)
1 threescrews 5 screw
(BTTP M2.6) (PTPWH M2.6)
15
CX-JN20/JN30
3-14. MOTOR GEAR ASSY (SLED) (M701), BD BOARD
7 gear (A)
6 claw
2 two screws 8 gear (B)
(P2 × 3)
5 wire (flat type) (16 core)
(CN708)
qa BD board
0 motor gear assy (SLED)
(M701)
1 Remove two
solders.
4 3 screw (P2.6 × 6)
9 Remove two solders.
16
CX-JN20/JN30
SECTION 4
TEST MODE
MC COLD RESET FUNCTION CHANGE MODE
· The cold reset clears all data including preset data stored in the · Select either TV, VIDEO or AUX (MD) of the external function
RAM to initial conditions. Execute this mode when returning input.
the set to the customer. Procedure:
Procedure: 1. Press the [POWER] button to turn the power on.
1. In the standby status, while pressing the x button, press the 2. While pressing the [VIDEO/AUX] button, press the [POWER]
[POWER] button. button.
2. The set is reset, then becomes standby status. 3. Each time this operation is operated, it change displays in or-
der of "TV", "VIDEO" and "AUX".
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 "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] 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 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] 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 from 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
CX-JN20/JN30
SECTION 5
ELECTRICAL ADJUSTMENTS
Note: Clear RF signal waveform means that the shape " " can be clearly
CD SECTION distinguished at the center of the waveform.
Note:
1. CD Block is basically designed to operate without adjustment. Therefore, RF signal waveform
check each item in order given. VOLT/DIV : 200mV
2. Use YEDS-18 (3-702-101-01) unless otherwise indicated. TIME/DIV : 500ns
3. Use an oscilloscope with more than 10M 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.
level : 1.3 ±0.3Vp-p
S-CURVE CHECK
Oscilloscope
BD board
Connecting Location: BD board
TP(FE)
TP(VC) BD Board (Conductor side)
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.
S-curve waveform
symmetry
TP (RF)
A
within 3 ±0.5Vp-p
B IC721
TP (VC)
TP (FE)
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.
RF LEVEL CHECK
oscilloscope
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.
19 19
CX-JN20/JN30
SECTION 6
DIAGRAMS
6-1. BLOCK DIAGRAM CD Section
OPTICAL PICK-UP
BLOCK CD DSP
(KSM-213DCP) IC721
A FIN2
8
LCHO CD
DETECTOR EQ, RF EFMIN D/A
42 A (Page 22)
RF AMP 4 3 ERROR
AGC CORRECT CONVERTER RCHO
A D 45 R-CH
D FIN1
7 IC802
MEMORY
I-V AMP
C
B C ASDFIN
B 57 2 ADDATA
23-30, 33-40
35-38, 40-43
I/O1 I/O16
MDATA15
EXTERNAL ASDACK
2-5, 7-10,
MDATA0
56 3 ADBCK
AUDIO IN ASLRCK
55 4 ADLRCK
DATA
60 79 DATAIN
DATACK
SERIAL OUT 59 80 DATACK
LRSY
18-21, 24-28
PH, BH
MADRS8
58 1 LRSY
60-53, 50
MADRS0
A0 A8
E E MP3 DECODER
TIN1 EFLG
9 IC801
53
A/D C2F
F TBAL 52 5 C2FIN
F CONVERTER FSX/16MIN
TIN2 OEB 45 29 OE
10 50 9 CKOUT
WEB 42 15 WE
RASB 41 16 RAS
MP3RES 26 78 RESB
CASLB 43 31 LCAS
LASER DIODE