FM tuning range87.5 MHz to 108 MHz
FM usable sensitivity (IHF) 16.8 dBf
FM antenna terminal75 ohms (unbalanced)
AM tuning range531 kHz to 1602 kHz
AM usable sensitivity350 µV/m
AM antennaLoop antenna
AMPLIFIER
Power outputFront:
Rated:
144 W + 144 W (6 ohms,
T.H.D. 1 %, 1 kHz/DIN 45500)
Reference: 180 W + 180 W (6 ohms,
T.H.D. 10 %, 1 kHz/DIN 45324)
MUSIC POWER: 320 W + 320 W
Front and Surround:
125 W + 55 W (6 ohms, T.H.D.
10 %, 1 kHz/DIN AUDIO)
Total harmonic distortion0.08 % (90 W, 1 kHz, 6 ohms, DIN
AUDIO)
Input
MD (VIDEO): 1.5 V
OutputsSPEAKERS: 6 ohms or more
PHONES: 32 ohms or more
CASSETTE DECK
Track format4 tracks, 2 channels stereo
Frequency response
50 Hz – 8 kHz
Recording systemAC bias
HeadsDeck A: playback x 1
Deck B: recording/playback x 1,
erase x 1
CD PLAYER
LaserSemiconductor laser
(λ = 780 nm)
Emission duration:
continuous
D/A converter1 bit dual
Signal-to-noise ratio85 dB (1 kHz, 0 dB)
Harmonic distortion0.05 % (1 kHz, 0 dB)
GENERAL
Power requirements230 V AC, 50/60 Hz
Power consumption210 W
Power consumptionWith ECO mode on: 0.25 W
in standby modeWith ECO mode off: 24 W
Dimensions (W x H x D) 280 x 328 x 437 mm
Weight10.3 kg
Specifications and external appearance are subject to
change without notice.
COPYRIGHT
Check copyright laws relevant to recordings from discs,
or tape for the countr y where the unit is to be used.
Licensed by BBE Sound, Inc. under USP4638258, 5510752
and 5736897.
(AEP, UK, CIS, E, SP, AUS)
280 x 328 x 446 mm (E51)
•Abbreviation
AUS : Australian model
E51 : Chilean and Peruvian models
SP : Singapore model
SERVICE MANUAL
Ver 1.0 2003.04
CX-JT8 is the tumer, amplifier , casette deck and
CD player section in JAX-T8 and JAX-PK8.
Model Name Using Similar MechanismNEW
CD
Section
Tape deck
Section
CD Mechanism TypeCDM74F-K6BD71A
Base Unit NameBU-K6BD71A
Optical Block NameKSM-213DCP
Optical Pick-up NameKSS-213D
Model Name Using Similar MechanismNEW
Tape Transport Mechanism TypeCWM43RR23
AEP Model
UK Model
E Model
Austr alian Model
9-877-255-01Sony Corporation
2003D0500-1Home Audio Company
C 2003.04Published by Sony Engineering Corporation
SPECIFICATIONS
COMPACT DISC DECK RECEIVER
CX-JT8
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
CLASS 1 LASER PRODUCT
LUOKAN 1 LASER LAITE
KLASS 1 LASER APPARAT
as a CLASS 1 LASER
product.
This label 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.
7-11. Base Unit Section (BU-K6BD71A) ............................... 71
8.ELECTRICAL PARTS LIST ............................... 72
•Abbreviation
AUS: Australian model
E51 : Chilean and Peruvian models
SP: Singapore model
3
CX-JT8
SECTION 1
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objectiv e lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the “S curve check” in “CD section adjustment” and
check that the S curve waveforms is output three times.
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.
• MODEL IDENTIFICATION
– Back Panel –
PART No.
MODELPART No.
Chilean and Peruvian models4-245-109-0
AEP, UK, CIS and Australian models4-245-109-2
E and Singapore models4-245-109-7
• DISCRIMINATION
Either type of the MAIN board, Part No. 1-688-080-11 or 1-688080-13 is used for Chilean and Peruvian models.
Note: For other models, only one type of the MAIN board, Part No. 1-
688-080-13 is used.
How to identify the type is described below.
– MAIN BOARD (Conductor Side) –
D324
CN309
IC303
CN312
[]
[]
[]
D324
Suffix-11×
Suffix-13a
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
3 Pull-out the disc tray.
CX-JT8
5
CX-JT8
SERVICE POSITION
– CD mechanism deck –
main board (CN312)
– Tape mechanism deck –
BD board (CN710)
panel board (CN601)
Connect wire (flat type) (19 core) to
main board (CN312) and BD board (CN710).
Connect wire (flat type) (13 core) to
panel board (CN601) and mechanical deck.
main board (CN203)
6
• LOCATION OF CONTROLS
SECTION 2
GENERAL
CX-JT8
This section is extracted from
instruction manual.
Main unit: front
Refer to the pages indicated in parentheses for details.
En
1 DISC CHANGE/DISC SKIP
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 TAPE A/B
Selects T ape function, and deck A or B.
TUNER BAND
Selects Tuner function and the radio band.
MD (VIDEO)
Selects the function of external equipment connected to
MD (VIDEO) jacks.
CD
Selects CD function.
4 TREBLE/MIDDLE
Enhances high or middle frequency sound.
5 CD SYNC
Starts Automatic CD dubbing.
REC PA USE/ST ART
Starts recording.
6 PHONES jack
Plug in here an optional headphones set with a mini
stereo plug (ø3.5 mm). Speaker output is canceled.
MIC jack (Except AEP, UK and CIS models)
Connects the microphone here.
MIC MIXING
(Except AEP, UK and CIS models)
Adjusts the microphone volume.
7 DISC DIRECT PLAY1-3
Selects a disc.
8 zOPEN/CLOSE
Opens or closes the disc compartment.
9 HEAVY, VOCAL, SALSA, TECHNO,
HIP HOP, MANUAL
Activates a graphic equalization curve.
0 MODE
Selects various modes (Play mode and Tape reverse,
when used in combination with ENTER and MULTI
ENTER
Fixes the modes and the time (Play mode and
reverse, etc.) when used in combination with MODE
MULTI JOG.
! MULTI JOG
CD: skips to a previous or a succeeding track.
Tuner: selects a preset station.
Clock and T imer: sets the time.
Selects the mode and the time when used in combination
with MODE and ENTER.
@ VOLUME
Adjusts the volume.
# BASS
Adjusts low frequency sound.
SURROUND
Switches surround on and off.
i-Bass
Produces rich and clear low frequency sound.
$ DISPLAY
Displays the time and the remaining time for CD.
When the unit is off, press DISPLA Y to switch between
DEMO, Clock and ECO display modes.
ALBUM k/i
Selects a previous album or a succeeding album with
MP3-CDs.
PTY (AEP and UK models)
Displays a program type for RDS (Radio Data System)
% r TUNING DOWN, tTUNING UP
( 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.
aPAUSE
CD and Tapes: pauses playback.
dDIRECTION
CD and Tapes: starts playback.
sSTOP
apes: stops playback.
CD and T
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 MD (VIDEO) 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 MD (VIDEO).
Tip:
To change the displayed name
unit on, then hold down MD (VIDEO) and press POWER
on the unit. Repeat the procedure to select "MD" or
“VIDEO".
3 SURROUND SPEAKER terminals
Connect for each speaker the blue cord to the 0 terminal
and the black cord to the
FRONT SPEAKER terminals
Connect for each speaker the red cord to the 0 terminal
and the black cord to the 9 terminal.
4 AC power cord
5 AC VOLTAGE selector
(Chilean and Peruvian models)
Switches AC voltage among 120V, 220V , and 230V - 240V .
Make sure it matches your local voltage.
for this function, turn the
9terminal.
En
7
CX-JT8
En
Buttons with the same or similar names with the
main unit
basically have the same function.
1 POWER
2 1-0/10, +10
Selects a CD track
of
the specified number .
The numbered buttons take on these functions
below
when pressed
together with SHIFT held down
:
EDIT
Enters Automatic CD dubbing mode when pressed in
stop mode.
BAND
Selects Tuner function and the radio band.
TAPE A/B
Selects Tape function, and deck A or B.
SPECTRUM
Changes the spectrum analyzer display.
KARAOKE
(Except AEP, UK and CIS models)
Selects V ocal Fader mode.
GEQ
Enters Graphic Equalizer setting mode.
TUNER MEMORY
Tuner: stores the received station in to preset.
SURROUND
Switches surround on and off.
3 r, t
CD: selects a track.
Tuner: selects a preset station.
BASS, MID 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
CD: selects a playback mode.
Tape: selects a reverse mode
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
Displays the time and the remaining time for CD.
When the unit is off, press DISPLAY to switch between
DEMO, Clock and ECO display modes.
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
be able to select Tuner function and the radio band.
Remote control
Refer to the pages indicated in parentheses for details.
9 FUNCTION
Switches the active function among CD, T APE, TUNER
and MD (VIDEO).
0 DISC SKIP
Select a disc.
! c/ d
CD and T ape: 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, MID or TREBLE setting mode
CLEAR
Clears a track of the CD programmed playback and a
Radio preset station.
TUNER MODE
Switches between stereo or monaural FM reception.
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 ”
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
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 . The time will be displayed for 6 seconds.
Tip: (Except AEP, UK and CIS models)
“AM 12:00” indicates midnight and “ PM
If “- -:- -” appears when the unit is turned off
There has been a power interruption. Re-set the clock.
8
Note
(AEP, UK and CIS models)
The buttons not explained above (
operate for this unit.
minute
the
12:00
” noon.
KARAOKE
) do not
• 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-JT8
SECTION 3
DISASSEMBLY
3-3. CASE (TOP)
(Page 10)
3-5. CD MECHANISM DECK
(CDM74F-K6BD71A)
(Page 11)
3-6. FRONT PANEL
SECTION
(Page 12)
3-7. MECHANICAL
DECK
(Page 12)
3-4. TRAY PANEL
3-8. REAR CABINET
3-9. MAIN BOARD
(Page 11)
SECTION
(Page 13)
(Page 13)
3-12. TABLE ASSY
(Page 15)
3-13. MOTOR (TB)
BOARD
(Page 15)
3-14. MOTOR (LD)
BOARD
(Page 16)
3-10. POWER
BOARD
(Page 14)
3-15. BASE UNIT
(BU-K6BD71A)
(Page 16)
3-16. MOTOR GEAR ASSY (SLED) (M701),
BD BOARD
(Page 17)
3-17. OPTICAL PICK-UP
(KSS-213D)
(Page 17)
3-11. TRANSFORMER BOARD
(Page 14)
9
CX-JT8
w
Note: Follow the disassembly procedure in the numerical order given.
3-2.CASE (SIDE-L/R)
7
three screws
(case3 TP2)
0
case (side-L)
8
9
6
3
two screws
(BVTP3× 10)
4
1
two screws
(BVTP3× 10)
5
case (side-R)
3-3.CASE (TOP)
4
claw
5
claw
7
case (top)
2
three screws
(case3 TP2)
1
6
two screws
(BVTP3
×
10)
2
cla
10
3
claw
3-4.TRAY PANEL
1
Turn the loading gear
in the direction of arrow A.
Remove the optical pick-up
(KSS-213D) in the direction
of arrow
B
.
2
sled shaft
A
1
Slide the lever
in the direction of arrow
A
.
17
CX-JT8
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. Press the [POWER] key to turn the power ON.
2. Press three keys of x , [ENTER] and [POWER] simultaneously.
3. The message “RESET” is displayed on the fluorescent indicator
tube momentarily, then becomes standby states.
[TUNER STEP CHANGE-OVER]
(Except AEP, UK and CIS models)
•A step of AM channels can be changed ov er between 9 kHz and
10 kHz.
Procedure:
1. Press the [POWER] key to turn the power ON.
2. Press the [TUNER BAND] key to select “AM”.
3. Press the [POWER] key to turn the power OFF.
4. Press two keys of [ENTER] and [POWER] simultaneously.
5. The message “9K STEP” or “10K STEP” is displayed on the
fluorescent indicator tube, and thus the channel step is changed
over.
[CD SHIP 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 [POWER] key to turn the power ON.
2. Press the [CD] key to select “CD”.
3. Press two keys of [CD] and [POWER] simultaneously.
4. The message “LOCK” is displayed on the fluorescent indicator
tube, and the CD ship mode is set.
[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.Set to standby state.
2.Press two keys of [MD VIDEO ]
3.The message “MD” or “VIDEO”is displayed on the fluorescent
indicator tube, and the function of external input is changed
over.
)(
and [POWER] simultaneously.
[CD TRAY LOCK MODE]
•This mode is used to unable to take sample disc out of tray in
the shop.
Procedure:
1. Press the [POWER] key to turn the power ON.
2. Press the [CD] key to select “CD”.
3. While pressing the x key, press the Z key for 5 seconds.
4. The message “LOCKED” is displayed on the fluorescent
indicator tube and the tray is locked. (Even if pressing
the Z key, the message “LOCKED” is displayed on the
fluorescent indicator tube and the tray is locked)
5. To release from this mode, while pressing the x key, press
the Z key for 5 seconds.
6. The message “UNLOCKED” is displayed on the fluorescent
indicator tube and the tray is unlocked.
[AMP TEST MODE]
•This mode is used to set the parameter of AMP IC for adjustment
of tone quality and VACS level and display VACS status.
Procedure:
1. Press the [POWER] key to turn the power ON.
2. Press three keys of x , [HEAVY] and [HIP POP] simultaneously.
3. When the AMP test mode is activated, the message “AMP
TEST” is displayed on the fluorescent indicator tube
momentarily.
4. Press two keys of [HEAVY] and [DISC DIRECT PLAY 2]
simultaneously, mode is changed over to parameter setting of
AMP IC and display of VACS status.
5. When the VACS ON, the message “V2255255” is displayed on
the fluorescent indicator tube, and when the VACS OFF, the
message “2255255” is displayed on the fluorescent indicator
tube.
6. Press the
7. Press the [ENTER] key, surround ON/OFF is changed over.
8. Press the [MANUAL] key, EQ band is changed over to LOW,
MID or HIGH.
9. Press the [HIP POP] and [TECHNO] key, EQ curve adjustment
value is changed over between –8dB to +8dB.
10. To release from this mode, press two keys of [HEAVY] and
[VOCAL] key, DBFB ON/OFF is changed over.
[TECHNO] simultaneously.
18
CX-JT8
[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 [POWER] key to turn the power ON.
2. Press the [CD] key to select “CD”.
3. Set disc on the tray and set tape into the deck.
4. Set the “ALL DISCS” mode and “REV OFF” mode.
5. Press three keys of x , [HEAVY] and [DISC CHANGE/DISC SKIP]
simultaneously.
6. The message “AGING” is displayed on the fluorescent indicator
tube momentarily, then aging operations of CD and tape are
started at the same time.
7. To release from this mode, operate the “COLD RESET”.
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
“AAG-1 or 2”
Shut off
FWD play the tape A
“AAG-3”
2 minutes
Fast forward the tape A
“AAG-4”
Shut off or 20 seconds
REV play the tape A
“AAG-5”
2 minutes
Rewind the tape A
“AAG-6”
Shut off
FWD play the tape B
“BAG-3”
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.
2 minutes
Fast forward the tape B
“BAG-4”
Shut off or 20 seconds
REV play the tape B
“BAG-5”
2 minutes
Rewind the tape B
“BAG-6”
Shut off
Note: “*AG-*” is display of each step.
19
CX-JT8
[GC TEST MODE]
• This mode is used to check the fluorescent indicator tube, LED
and key.
Procedure:
1. Press the [POWER] key to turn the power ON.
2. Press three keys of x , [HEAVY] and [DISC DIRECT PLAY 2]
simultaneously.
3. Fluorescent indicator tube and LEDs are all turned ON.
4. Press two keys of [HEAVY] and [DISC DIRECT PLAY 2]
simultaneously, mode is changed over.
5. In the key check mode, press each key , the defined k e y number
of every each key list is displayed on the fluorescent indicator
tube.
6. In the key count check mode, “K-CNT 0” is displayed on the
fluorescent indicator tube. Each time a key is pressed, “K” value
increases. However, once a key is pressed, it is no longer taken
into account.
7. In the headphone input check mode, connect the headphone,
the message “H_P ON” is displayed on the fluorescent indicator
tube, and disconnect the headphone, the message “H_P OFF”
is displayed on the fluorescent indicator tube.
8. In the volume check mode, turn the [VOLUME] knob, the
display on the fluorescent indicator tube is changed over to
“VOL UP”, “VOL FLAT” or “VOL DOWN”
[MC TEST MODE]
•This mode is used to check operations of Amplifier.
Procedure:
1. Press the [POWER] key to turn the power ON.
2. Press three keys of x , [HEAVY] and [DISC DIRECT PLAY 3]
simultaneously.
3. When the MC test mode is activated, the message “MC MODE”
is displayed on the fluorescent indicator tube momentarily, then
VACS level is displayed on the fluorescent indicator tube.
4. Press the
indicator tube is changed over to “EQ MAX”, press the
[TECHNO] key, the display on the fluorescent
[MANUAL] key, the display on the fluorescent indicator tube is
changed over to “EQ MID”, press the [HIP POP] key, the
display on the fluorescent indicator tube is changed over to “EQ
MIN”,
5. Turn the [VOLUME] knob, the display on the fluorescent
indicator tube is changed over to “VOL MAX”, “VOL MID” or
“VOL MIN”
6. Press the [ENTER] key, VACS ON/OFF is changed over.
7. When the [REC PAUSE/START] key is pressed with a tape set
in the deck-B, the function is switched “MD” or “VIDEO” and
recording starts. When the m or M key is pressed during
recording, the tape is rewound back to the beginning of
recording, the function is switched to “T APE B”, then playback
starts.
8. 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.
9. To release from this mode, press the [POWER] key.
[MODEL, DESTINATION AND VERSION DISPLAY]
• This mode is used to check the model, destination and software
version.
Procedure:
1. Set to the standby state.
2. Press three keys of x , [TECHNO] and [HEAVY] simultaneously.
3. When the model, destination and version display mode is
activated, the model an destination is displayed on the
fluorescent indicator tube.
4. Press two keys of [HEAVY] and [DISC DIRECT PLAY 2]
simultaneously, mode is changed o ver to model and destination
display mode and version display mode.
5. In the version display mode, press the [DISC DIRECT PLAY 3]
key, display is changed over to version display and year, month
and day of the software creation display.
6. To release from this mode, press the two keys of [TECHNO]
and [HEAVY] simultaneously.
[CD ERROR CODE DISPLAY]
• This mode can be used for error display of CD section.
Procedure:
1. Press the [POWER] key to turn the power ON.
2. Press the [CD] key to select “CD”.
3. Press three keys of x , [HEAVY] and [DISC DIRECT PLAY 1]
simultaneously.
Note: Error code is not displayed on the liquid crystal display.
[CD SERVICE MODE]
•This mode can run the CD sled motor freely. Use this mode , for
instance, when cleaning the optical pick-up.
Procedure:
1. Press the [POWER] key to turn the power ON.
2. Press the
3. Press three keys of x , [HEAVY] and Z simultaneously.
4. When the CD service mode is activated, the message “TRVS
ON” is displayed on the fluorescent indicator tube.
5. Press the M key, optical pick-up move to outside track and
the message “SLED OUT” is displayed on the fluorescent
indicator tube.
6. Press the m key, optical pick-up move to inside track and
the message “SLED IN” is displayed on the fluorescent indicator
tube..
7. Press the [TECHNO] key, traverse ON/OFF is changed over.
[CD] key to select “CD”.
[5 REPEAT LIMIT CANCEL]
• Number of repeat for CD playback is 5 times when the repeat
mode is “REPEAT”. This mode is used to enables CD to repeat
playback for limitless times.
Procedure:
1. Press the [POWER] key to turn the power ON.
2. Press the [CD] key to select “CD”.
3. Press three keys of x , [HEAVY] and Y simultaneously.
20
p
p
SECTION 5
ELECTRICAL ADJUSTMENTS
CX-JT8
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 (VC)
TP (RF)
TP (FE)
IC721
2121
CX-JT8
SECTION 6
DIAGRAMS
6-1.BLOCK DIAGRAM – CD Section –
A
DETECTOR
A
D
C
B
E
F
LASER DIODE
PD
D
C
I-V AMP
B
E
F
LD
LD
PD
AUTOMATIC
POWER CONTROL
Q701
RF AMP, FOCUS/TRACKING ERROR AMP,
DIGITAL SIGNAL PROCESSOR, DIGIRAL SERVO PROCESSOR,
INPUT SELECTSWITCH, TONE CONTROL,
ELECTRICAL VOLUME, BASS BOOST AMP
IC301 (SUFFIX-11) IC301 (SUFFIX-13)
29
TOUT
RECB-2
35
BASS BOOST ENHANCER
IC303 (SUFFIX-11) IC303 (SUFFIX-13)
VREF
BASS BOOST
ON/OFF SWITCH
BASS BOOST CONTROLLER
IC310 (SUFFIX-11) IC310 (SUFFIX-13)
3
SO
RESET SIGNAL
GENERATOR
MIC
BBE
7
Q323
9
I-BASS
DATA4CLOCK
5
LCK
CLK
IC502
+3.3V (SUB)
LCK
28
BASS BOOST
CONTROL
Q317 – 320
16 – 13
BB CTRL1 –
BB CTRL4
OUTA
13
D504
VOLIN2
GIN
6
BASS BOOST
+4V
SA
19
SAOUT
OUT2
DATA22CLOCK
21
MCLK
DI
CONTROL
Q492
+4V
REGULATOR
IC501
EVER+10V
MIC, SA
SWITCHING
Q18
R-CH
SWITCHING
Q17, 19, 22
VM+10V
CENTER VOLATAGE
GENERATOR
Q324
IC304 (SUFFIX-11) IC304 (SUFFIX-13)
25
FEED BACK
SWITCH
Q491
RECT
D902 – 905
BUFFER
IC304
R-CH
+
+1.8V
O-POWER
(MP3)
VCC
SUB POWER
TRANSFORMER
PT902
MUTING CONTROL
+1.8V
REGULATOR
IC803
B+ SWITCH
Q301, 302
MUTING
Q525
SWITCH
Q527
S-MUTE
DECK+9V, M+9V
PRE DRIVE
Q517, 519
R-CH
+3.3V (MAIN)
CURRENT
MIRROR
Q521, 523
CASCADE
Q511, 513, 515
D102
D513
REGULATOR
IC306
POWER OFF
MUTING DRIVER
Q529, 530
IC306 (SUFFIX-11) IC306 (SUFFIX-13)
D313 – 315
P+7V
VM+9V
VM+10V
+4V
R-CH
–VP
+VP
FINAL DRIVE
Q501, 503
BIAS
Q507, 509
OVER CURRENT
DETECT
Q13
VM+10V
REGULATOR
IC305 (SUFFIX-11) IC305 (SUFFIX-13)
REGULATOR
IC308 (SUFFIX-11) IC308 (SUFFIX-13)
REGULATOR
IC313 (SUFFIX-11) IC313 (SUFFIX-13)
TO
POWER AMP
BLOCK
VF1
TO
FLUORESCENT
INDICATOR TUBE
VF2
–VFL
R-CH
+9V
IC305
+9V
IC308
+10V
IC313
REGULATOR
OVER LOAD
Q533 – 536
DETECT
Q505
+
+
HOLD
Q12
+VH
–VH
+VL
–VL
–30V
R-CH
+VH
+VL
–VH
–VL
DC DETECT
RELAY B++9V
OUTPUT LEVEL
DETECT
Q20, 21
OUTPUT LEVEL
DETECT
Q23, 24
+
Q5, 6
+
HOLD
Q7 – 9
+
HOLD
RECT
D301 – 304
RECT
D319 – 322
RECT
RECT
POWER ON/OFF
RELAY DRIVE
THERMAL DETECT
Q10, 11
O-POWER
D1
D2
Q330, 331
R-CH
+
R-CH
MAIN POWER
TRANSFORMER
PT901
VM
VM
VH
VH
VL
VL
(Chilean, Peruvian)
RY901
RY902
Except
Chilean, Peruvian
TH501,
502
FAN MOTOR
ON/OFF SWITCH
Q327, 328, 372, 373
M731
M
(FAN)
+
R-CH
R-CH
RY501
RY502
R-ch is omitted due to same as L-ch.
SIGNAL PATH
R-CH
SURROUND SPEAKER
ON/OFF RELAY DRIVE
Q532
FRONT SPEAKER
ON/OFF RELAY DRIVE
Q304
S-MUTE, O-POWER, HOLD
: TUNER (FM/AM)
: CD PLAY
: TAPE PLAY
: REC
: MD (VIDEO) IN
: MIC INPUT
Except AEP, UK,
CIS, Australian
S901
AC VOLTAGE
VOLTAGE
SELECTOR
AEP, UK, CIS,
Australian
SURR
SP-F
SP-F,
SURR
(AC IN)
HP
J221
PHONES
JK503 (1/2)
FRONT
SPEAKER
JK503 (2/2)
SURROUND
SPEAKER
E
F
+
–
+
–
+
–
+
–
H
B
(Page 23)
(Page 23)
L
R
L
R
(Page 23)
(Page 22)
2424
CX-JT8
6-4.NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
•: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side:Parts on the pattern face side seen from
(Conductor Side)the pattern face are indicated.
Parts face side:Parts on the parts face side seen from
(Component Side) the parts face are indicated.
• Indication of transistor.
C
Q
B
E
B
B
These are omitted.
Q
CE
These are omitted.
Q
CE
These are omitted.
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and 1/
specified.
• 2 : nonflammable resistor.
• C : panel designation.
Note: The components identified by mark 0 or dotted line
with mark 0 are critical for safety.
Replace only with part number specified.
• A : B+ Line.
• B : B– Line.
•Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(): CD PLAY
[]: TAPE PLAY (DECK-A)
{ } : TAPE PLAY (DECK-B)
〈〈〉〉 : REC
•Voltages are taken with a V OM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production tolerances.
•Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F: TUNER (FM/AM)
J: CD PLAY
E: TAPE PLAY (DECK-A)
d: TAPE PLAY (DECK-B)
G : REC
j: MD (VIDEO) IN
N: MIC INPUT
•Abbreviation
AUS: Australian model
E51 : Chilean and Peluvian models
SP: Singapore model
: Impossible to measure
∗
4
W or less unless otherwise
• Circuit Boards Location
MOTOR (LD) board
CD BUTTON board
PANEL board
HEADPHONE board
MICROPHONE board
(E, E51, SP, AUS)
TRANSFORMER board
SENSOR board
SW board
BD board
MOTOR (TB) board
TUNER PACK
DRIVER board
MAIN board
POWER board
2525
CX-JT8
6-5.PRINTED WIRING BOARD – BD Board – • See page 25 for Circuit Boards Location. :Uses unleaded solder.
1234567891011
A
BD BOARD
(COMPONENT SIDE)
OPTICAL
PICK-UP
BLOCK
(KSM-213DCP)
BD BOARD
(CONDUCTOR SIDE)
B
+
M
B
C
E
M702
(SPINDLE)
–
S701
(LIMIT IN)
+
C
D
E
F
FB806
FB805
FB803
FB804
R806
R807
IC801
IC802
C817
C860
R860
1-688-077-
11
(11)
TP
(FE)
TP
(VC)
TP
(TE)
TP
(RF)
IC721
IC722
R747 R746
71148
22281521
34
IC803
M701
M
(SLED)
–
(SUFFIX-11)
A1
MAIN
BOARD
CN321
(Page 34)
A2
MAIN
BOARD
CN321
(Page 35)
(SUFFIX-13)
5
1-688-077-
11
(11)
• Semiconductor Location
Ref. No. Location
IC721D-8
IC722C-9
IC801E-3
IC802F-3
IC803F-9
Q701B-7
2626
6-6.SCHEMATIC DIAGRAM – BD Board – • See page 52 for IC Block Diagrams. • See page 52 for Waveforms.
CX-JT8
R732
F
0
R
R731
2.2k
R707
10
C709
C746C708 R729
100
0.10.1 12k
0.0047
6.3V
C704
47
6.3V
R727C703
1000.1
S701
R708C710
10k0.047
TP
(RF)
TP
(VC)
TP
(FE)
TP
(TE)
R738
6.8k
SLCO
SLCIST
EFMIN
RF
RFVDD
RFVSS
FIN1
FIN2
TIN1
TIN2
VREF
REF1
FE
TEC
TE
RFMON
JITTC
ADAVDD
ADAVSS
TDO
D
LD
O
FD
0
R739
Q701
UP0411600SO
AUTOMATIC
C705
0.001
C723
100
6.3V
F
C
(LD)(PD)
E
C
C
D
C
V
N
V
G
C
D
A
B
N
CN708
16P
VC
VCC
E
D
A
B
C
F
GND
LD
VR
PD
F+
T-
T+
F-
100
R745
C714
0.1
C701
0.1
C702
100
6.3V
C706
0.1
POWER
CONTROL
(LIMIT IN)
C711
0.1
C712
47p
R702
15k
R703
R704
R705
R701
R706
C716
C715
C717
C718
C719
C720
15k
15k
15k
47k
47k
0.001
1 50V
0.0047
1
0.0047
100p
R709
27k
R711
330
C713
0.1
C721
C744
1
C743
0.047
R725R726
680680
R730
1.2k
T
S
D
FR
D
D
IS
L
V
K
V
C
P
C
4
T
A
O
O
N
D
D
P
O
LD
P
C
S
G
S
6.8k
0
R740
R741
R728
47k
E
1
2
S
T
O
O
S
U
V
D
D
V
P
P
M
_
D
C
RF AMP,
FOCUS/TRACKING ERROR AMP,
DIGITAL SIGNAL PROCESSOR,
DIGITAL SERVO PROCESSOR,
DIGITAL FILTER,D/A CONVERTER
LC78646E-E
6
T
N
O
G
S
T
E
/F
/C
C
R
K
K
E
3
C
C
F
P
E
B
B
D
M
S
S
R760
100
D
C753
47p
C754C742
47p0.1
C741
0.1
2
5
W
T
D
SS
N
S
V
D
O
V
IT
C
IM
L
IC721
I2
I1
Q
N
N
P
E
O
O
/*
S
M
M
F
V
C756
47p
I
S
O
Q
D
E
D
R
R
W
_
_
D
D
C
C
100
100
100
100
R718
R719
R716
R717
F
S
O
Q
R
E
D
R
D
W
*R
*
I3
I4
I5
N
N
N
O
O
O
SS
M
M
V
M
C722
0.1
L
E
C
C
_
D
C
R722
R721
1k
100
100
R720
1
C856
C823
I
L
E
D
C
C
DATA
DATACK
LRSY
ASDFIN
ASDACK
ASLRCK
16MOUT
EFLG
C2F
XVSS
FSX/16MIN
XIN
XOUT
XVDD
RVDD
RCHO
RVSS
LVSS
LCHO
LVDD
T
U
D
O
D
TEST
D
V
R823
100
C731
47p
C824
R824
47p
100
FB808
R829
0.1
100
R713
FB701
0.01
C733
0.01
C732
C729
220
10V
R747
33
R746
33
R825
100
R826
R827
R828
C830
C829
FB807
1M15p
R765C734
1k
16.9344MHz
R715
100
R714
100
C825
47p
100
100
100
22p
47p
C831
22p
X701
18p
C735
FB801
FB802
C811
0.1
C812
C810
1
0.1
R818
150
R817
3.3k
R819R820
1k1k
C816
0.1
C814
100
6.3V
C815
220
10V
C813
0.1
C837
0.1
DATACK
LRSY
ADDATA
ADBCK
ADLRCK
C2FIN
TEST1
CKIN
VSS
CKOUT
TEST2
DVDD1
PW
SBSY
SFSY
SBCK
AVDD
VPRFR
VCOC
VPDO
AVSS
DVDD2
E
C
_
3
P
M
R834
100
C807
5
I/O
100
6.3V
IN
D
CM
4
A
T
A
D
M
6
I/O
C804
C859
C858
C857
R833 R832
100 2.2k
F
T
V
U
O
O
D
M
C
MP3 DECODER
LC78684E-E
6
A5
TA
T
A
A
D
D
M
M
7
I/O
C802
0.1
22p
22p
22p
22p
K
O
T
CN
IC801
7
TA
A
D
M
8
I/O
C844
0.1
L
E
B
B
IN
T
C
C
A
ES
T
IN
R
A
D
3
2
A
A
A1
A0
T
T
T
T
A
A
A
A
S
S
V
D
D
D
D
M
M
M
M
1
2
3
4
I/O
I/O
I/O
I/O
C
N
Y
FS
R860
100
C860
100p
F
C
K
S
C
AT
D6
S
N
O
R
V
D
Y
W
C
V
STD
FS
D
11
10
8
3
A
A9
TA
T
T
TA
D
D
S
V
VS
D
A
A
A
A
D
D
D
D
M
M
M
M
0
1
2
9
1
1
1
I/O
I/O
I/O
I/O
K
TC
S
2
1
TA
A
D
M
3
1
I/O
+1.8V REGULATOR
DVDD5
S
EQ
S
V
R
T
S
MADRS10
MADRS11
MADRS12
13
14
TA
TA
A
A
D
D
MDATA15
M
M
4
5
1
1
I/O
I/O
MM1571J
VIN
GND
CONT
MADRS0
MADRS1
MADRS2
MADRS3
MADRS4
MADRS5
MADRS6
MADRS7
DVDD4
MADRS8
MADRS9
CASUB
CASLB
16
I/O
IC803
VO
NOISE
C806
0.1
C805
C803
100
0.01
C843
0.1
VSS
OEB
WEB
RASB
6.3V
A0
A1
A2
A3
A4
A5
A6
0.1
A7
C817
A8
OE
UCAS
LCAS
WE
RAS
M701
(SLED)
M702
(SPINDLE)
C707
100
6.3V
SLED/SPINDLE
MOTOR DRIVE,
FOCUS/TRACKING
COIL DRIVE
IC722
BA5836FP
E
S
S
A
A
C
C
L
U
100
100
R805
R804
S
S
C
N
CA
CA
L
U
E
C
C
N
W
N
R801R802
100100
E
W
8
A
O
100
R803
E
O
AS
R
S
A
R
C835
0.1
C834
220
10V
4
S
C
D
N
4(-)
G
O
V
)
(+
(-)
1
1
O
O
V
V
C
IN
C
C
(+)
L
IN
IA
4
O
V
IN
P
S
V
V
S
B
T
U
O
-B
ET
TE
D
G
G
U
N
E
E
ES
R
G
M
R
R
R744
100k
T
3
IN
T
2
IN
P
(-)
E
(+)
O
IN
3(-)
S
3
IN
E
O
V
R
VO
T
)
U
(+
(-)
D
2
2
IN
FO
O
P
N
O
O
V
V
O
G
FB707FB708
FB804
C748
C747
220
0.1
10V
FB803
FB805
R807
100
R806
100
FB806
6
1
1
1
1
I/O
I/O
I/O
I/O
4
S
15
1
16
S
V
I/O
I/O
I/O
2
3
1
CC
I/O
I/O
I/O
V
1
2
3
4
I/O
I/O
I/O
I/O
1
1
1
I/O
I/O
I/O
I/O
2
1
0
3
S
1
1
1
1
S
I/O9
V
I/O
I/O
I/O
I/O
8
7
6
5
4
C
C
I/O
I/O
I/O
I/O
V
I/O
5
6
7
8
I/O
I/O
I/O
I/O
9
0
1
2
3
4
5
4
5
7
6
A
A
A
A
CN710
CD_WRQ
MP3_CE
CD_RES
AMUTE
P+7.0V
CD_CE
FSYNC
A-GND
D.OUT
D-GND
P-GND
19P
DRF
3.3V
R-CH
L-CH
3.3V
(SUFFIX-11)
CL
DO
DI
A1
(Page 32)
A2
(Page 38)
(SUFFIX-13)
A8
C
A0
N
0
A
S
V
MEMORY
IC802
LC32V4265CT
CC
2
V
A3
A
A1
1
2
3
A
A
A
CD_CE
DRF
CD_WRQ
-25
FSYNC
MP3_CE
CL
DO
DI
CD_RES
S
A4
A5
A6
A7
The components identified by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specified.
2727
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