Aiwa CXJDS-20, CXJDS-50 Service manual
CX-JDS20/JDS50
SERVICE MANUAL
Ver. 1.0 2005.03
CX-JDS20/JDS50 are the Amplifier, CD player, Tape
Deck and Tuner section in DBX-DS20/DBX-DS50.
Photo : CX-JDS50
CD
Section
TAPE
Section T ape Transport Mechanism T ype
AEP Model
CX-JDS20
E Model
CX-JDS20/JDS50
Australian Model
CX-JDS20
Russian Model
CX-JDS20/JDS50
Model Name Using Similar Mechanism NEW
CD Mechanism Type BU-F1BD81A
Optical Pick-up Name KSM-215DCP/C2NP
Model Name Using Similar Mechanism CX-LEM330
JDS20 CMAL5Z220A
JDS50 CMAL1Z240A
Amplifier section
European model:
JDS20
DIN power output (rated): 96 + 96 watts (6 ohms at
1kHz, DIN)
Continuous RMS power output (reference):
120 + 120 watts (6 ohms at
1kHz, 10% THD)
Music power output (reference):
180 + 180 watts (6 ohms at
1kHz, 10% THD)
Russian model:
JDS50
DIN power output (rated): 160 + 160 watts (6 ohms at
1kHz, DIN)
Continuous RMS power output (reference):
200 + 200 watts (6 ohms at
1kHz, 10% THD)
Music power output (reference):
330 + 330 watts (6 ohms at
1kHz, 10% THD)
SPECIFICATIONS
JDS20
DIN power output (rated): 96 + 96 watts (6 ohms at
1kHz, DIN)
Continuous RMS power output (reference):
120 + 120 watts (6 ohms at
1kHz, 10% THD)
Music power output (reference):
180 + 180 watts (6 ohms at
1kHz, 10% THD)
Other mode ls :
JDS50
The following measured at AC 120, 127, 220, 240 V
50/60 Hz
DIN power output (rated): 160 + 160 watts (6 ohms at
1kHz, DIN)
Continuous RMS power output (reference):
200 + 200 watts (6 ohms at
1kHz, 10% THD)
JDS20
The following measured at AC 120, 127, 220, 240 V
50/60 Hz
DIN power output (rated): 96 + 96 watts (6 ohms at
Continuous RMS power output (reference):
Inputs
AUDIO IN (stereo mini jack):
MIC (phone jack) (except for European model):
Outputs
PHONES (stereo mini jack):
SPEAKER: accepts impedance of 6 to
1kHz, DIN)
120 + 120 watts (6 ohms at
1kHz, 10% THD)
voltage :
JDS20: 1.85 V
JDS50: 0.9 V,
impedance 47 kilohms
se
nsitivity:
JDS20: 0.25 mV
JDS50: 0.1 mV,
impedance 10 kilohms
accepts headphones of
8ohms or more
16 ohms
— Continued on next page —
9-879-515-01
2005C1678-1
© 2005.03
COMPACT DISC DECK RECEIVER
Sony Corporation
Personal Audio Group
Published by Sony Engineering Corporation
CX-JDS20/JDS50
CD player section
System Compact disc and digital
audio system
Laser Diode Properties Emission duration:
continuous
Laser Output: Less than
44.6 µW
(This output is the value
measurement at a distance
of 200 mm from the
objective lens surface on
the Optical Pick-up Block
with 7 mm aperture)
Frequency response 2 Hz – 20 kHz (±0.5 dB)
Signal-to-noise ratio More than 90 dB
Dynamic range More than 90 dB
Tape deck section
Recording system 4-track 2-channel, stereo
Frequency response 50 – 13,000 Hz (±3 dB),
using Sony TYPE I
cassettes
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5 – 108.0 MHz
(50 kHz step)
Antenna FM lead antenna
Antenna terminals 75 ohms unbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range
European and Russian models:
531 – 1,602 kHz (with the
tuning interval set at
9kHz)
Pan-American models: 530 – 1,710 kHz
(with the tuning interval
set at 10 kHz)
531 – 1,710 kHz
(with the tuning interval
set at 9 kHz)
Other models: 530 – 1,710 kHz
(with the tuning interval
set at 10 kHz)
531 – 1,602 kHz
(with the tuning interval
set at 9 kHz)
Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz
General
Power requirements
European and Russian models:
230 V AC, 50/60 Hz
Australian model: 230 – 240 V AC, 50/60 Hz
Argentine model: 220 V AC, 50/60 Hz
Mexican model: 127 V AC, 60 Hz
Other models: 120 V, 220 V or
230 – 240 V AC, 50/60 Hz
Adjustable with voltage
selector
Power consumption
European model:
JDS20: 198 watts
0.25 watts (at the Power
Saving Mode)
Other models:
JDS50: 160 watts
JDS20: 198 watts
Dimensions (w/h/d) (excl. speakers):
Approx. 230 × 365.5 ×
409 mm
Mass (excl. speakers) Approx. 9.1 kg
Design and specifications are subject to change
without notice.
MODEL IDENTIFICATION
– BACK PANEL –
Part No.
3
#
#
3
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
Model Part No.
JDS50: MX model 2-595-343-0[]
JDS20: MX model 2-595-345-0[]
JDS50: E51 model 2-595-523-0[]
JDS20: E51 model 2-595-525-0[]
JDS50: RU model 2-599-602-0[]
JDS20: AEP, RU models 2-599-608-0[]
JDS20: AUS model 2-599-613-0[]
•Abbreviation
AUS: Australian model
E51 : Chilean and Peruvian models
MX : Mexican model
RU : Russian model
CX-JDS20/JDS50
The release method of a CD disc tray LOCK function
There is a disc lock function for the disc theft prevention for a
demonstration at a shop front in this machine.
Procedue:
1. Press the ?/1 button to turn the set on.
2. Press two buttons of x and Z simultaneously for five
seconds.
3. The message “LOCKED” is displayed and the tray is
locked. (Even if exiting from this mode, the tray is still
locked.)
4. Press two buttons of x and Z simultaneously for five
seconds again.
5. The message “UNLOCKED” is displayed and the tray is
unlocked.
6. To exit from this mode, press the ?/1 button to turn the
set off.
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.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pickup block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on the
exterior.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.
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.
3
CX-JDS20/JDS50
TABLE OF CONTENTS
1. GENERAL ................................................................... 5
2. DISASSEMBLY
2-1. Disassembly Flow ........................................................... 7
2-2. Top Panel, Side Panel ...................................................... 8
2-3. Front Section ................................................................... 8
2-4. CD Mechanism Section ................................................... 9
2-5. Cassette Mechanism Deck, DS-PAI/HP/MIC Board ...... 9
2-6. DS-PANEL Board ........................................................... 10
2-7. Rear Cabinet .................................................................... 10
2-8. Power Trans ..................................................................... 11
2-9. DS-MAIN Board, Heat Sink ........................................... 11
2-10. Holder (CD Mech) ........................................................... 12
2-11. Base Unit (BU-F1BD81A), CD Mech ............................ 12
2-12. BD Board, Optical Pick-up (KSM-215DCP/C2NP) ....... 13
2-13. Frame ............................................................................... 13
2-14. Belt .................................................................................. 14
2-15. Cassette Panel .................................................................. 15
3. TEST MODE ............................................................... 16
4. MECHANICAL ADJUSTMENTS......................... 17
5. ELECTRICAL ADJUSTMENTS .......................... 17
6. DIAGRAMS
6-1. Block Diagram – MAIN Section – ................................. 22
– BD Section – ................................................................ 23
6-2. Printed Wiring Board – BD Section – ............................ 24
6-3. Schematic Diagram – BD Section – ............................... 25
6-4. Printed Wiring Board – MAIN (JDS20) Section –......... 26
6-5. Printed Wiring Board – MAIN (JDS50) Section –......... 27
6-6. Schematic Diagram – MAIN Section (1/2) – ................. 28
6-7. Schematic Diagram – MAIN Section (2/2) – ................. 29
6-8. Printed Wiring Board
– PANEL (JDS20/JDS50) Section – ............................... 30
6-9. Schematic Diagram – PANEL Section (1/2) – ............... 31
6-10. Schematic Diagram – PANEL Section (2/2) – ............... 32
6-11. Printed Wiring Board
– PANEL COMB (JDS20) Section – .............................. 33
6-12. Printed Wiring Board
– PANEL COMB (JDS50) Section – .............................. 34
6-13. Schematic Diagram – PANEL COMB Section – ........... 35
6-14. Printed Wiring Board – AMP (JDS20) Section – ........... 36
6-15. Printed Wiring Board – AMP (JDS50) Section – ........... 37
6-16. Schematic Diagram – AMP (JDS20) Section –.............. 38
6-17. Schematic Diagram – AMP (JDS50) Section –.............. 39
6-18. Printed Wiring Board
– POWER (JDS20/JDS50) Section – .............................. 40
6-19. Schematic Diagram – POWER Section – ...................... 41
7. EXPLODED VIEWS
7-1. Overall Section ................................................................ 50
7-2. Front Section ................................................................... 51
7-3. Chassis Section ................................................................ 52
7-4. CD Mechanism Section-1 ............................................... 53
7-5. CD Mechanism Section-2 ............................................... 54
8. ELECTRICAL PARTS LIST .................................. 55
4
SECTION 1
Illustrati
GENERAL
List of button locations and reference pages
CX-JDS20/JDS50
This section is extracted
from instruction manual.
How to use this page
Use this page to find the location of buttons and other
parts of the system that are mentioned in the text.
Main unit
ALPHABETICAL ORDER
A – N M – Z
AUDIO IN jack w; (28)
BASS control qf (21)
CANCEL wl (11)
CD SYNC wk (18)
Cassette compartment qh (17)
DISC 1 – 3 4 (10)
DISC SKIP/EX-CHANGE 5
(10, 13, 18)
Disc tray 6 (9)
DISPLAY qd (16, 25, 26)
Display window 3
ENTER wf (11, 13, 14)
EQ 0 (20)
FM MODE wd (16)
FUNCTION wj (9, 13, 14, 15, 17,
18, 19, 21, 28)
i-Bass 9 (20, 31)
1)
MIC jack
MIC LEVEL
MIDDLE control qs (21)
Jog dial ws (11, 13)
PHONES jack ql
PLAY MODE wg (10, 13, 17)
REC PAUSE/START 8 (18, 19,
Remote sensor 2
REP wd (12)
TREBLE control qa (21)
TUNER/BAND wh (14, 15)
TUNING +/– wl (14, 15)
TUNING MODE wg (14, 15)
VOLUME control wa (27)
21)
qj (21)
1)
qk (21)
on number
r
TUNER/BAND wh (14, 15)
Name of button/par t Reference page
RR
BUTTON DESCRIPTIONS
?/1 (power) 1 (7, 15)
Z (eject) 7 (9)
Z PUSH (eject) qg (17)
lm/ML (rewind/fast
forward, go back/go forward)
wl (10, 17)
x (stop) wl (10, 17, 18, 21, 27,
31)
2)
N
or nN3) (play) wl (10,
17, 18)
X (pause) wl (10, 17, 31)
1)
Except for European model
2)
DBX-DS20
3)
DBX-DS50
wl
wk
wj
wh
wg
wf
wd
ws
wa
w;
ql
1 762 3 54
8
9
0
qa
qs
qd
qf
qg
qh
qj
qk
5
CX-JDS20/JDS50
Remote control
ALPHABETICAL ORDER
A – E
CD qk (9, 12)
CLEAR qg (13)
CLOCK/TIMER SELECT 2
(24, 25)
CLOCK/TIMER SET 3 (8, 23,
24)
DISC SKIP q; (10, 12)
DISPLAY wa (16, 25, 26)
ENTER 9 (8, 12, 14, 23, 24)
EQ qf (20)
F – Z
FM MODE 4 (16)
FOLDER + qa (10, 12, 18)
FOLDER – qd (10, 12, 18)
FUNCTION 6 (9, 12, 14, 15, 17,
28)
PLAY MODE w; (10, 12, 17)
REPEAT 4 (12)
SLEEP ws (23)
TAPE qj (17)
TUNER BAND 5 (14, 15)
TUNER MEMORY ql (14)
TUNING MODE w; (14, 15)
VOLUME +/– qs (23)
ws
wa
w;
ql
qk
qj
qh
BUTTON DESCRIPTIONS
?/1 (power) 1 (7, 24)
m/M (rewind/fast forward)
7 (10, 17)
N (play) 8 (10, 17)
X (pause) 8 (10, 17)
x (stop) 8 (10, 17)
+/– (tuning) qh (14)
./> (go back/go forward)
qh (8, 10, 23)
1
2
3
4
5
6
7
qg
qf
qd
8
9
q;
qa
qs
Setting the clock
Use buttons on the remote for the operation.
1
Press ?/1 to turn on the system.
2
Press CLOCK/TIMER SET.
3
Press . or > repeatedly to set the
hour.
4
Press ENTER.
5
Press . or > repeatedly to set the
minute.
6
Press ENTER.
The clock starts working.
To adjust the clock
1
Press CLOCK/TIMER SET.
2
Press . or > repeatedly to select
“CLOCK SET”, then press ENTER.
3
Do the same procedures as step 3 to 6
above.
Notes
The clock settings are canceled when you disconnect
the power cord or if a power failure occurs.
You cannot set the clock in Power Saving Mode
(page 25).
6
2-1. DISASSEMBLY FLOW
SET
2-2. TOP PANEL, SIDE PANEL
(Page 8)
2-15. CASSETTE PANEL
(Page 15)
2-3. FRONT SECTION
(Page 8)
2-7. REAR CABINET
(Page 10)
2-10. HOLDER (CD MECH)
(Page 12)
2-14. BELT
(Page 14)
2-8. POWER TRANS
(Page 11)
2-11. BASE UNIT (BU-F1BD81A),
CD MECH
(Page 12)
2-4. CD MECHANISM SECTION
(Page 9)
2-6. DS-PANEL BOARD
(Page 10)
2-5. CASSETTE MECHANISM DECK,
DS-PAI/HP/MIC BOARD
(Page 9)
2-9. DS-MAIN BOARD,
HEAT SINK
(Page 11)
2-13. FRAME
(Page 13)
2-12. BD BORD, OPTICAL PICK-UP
(KSM-215DCP/C2NP)
(Page 13)
•This set can be disassembled in the order shown below.
CX-JDS20/JDS50
SECTION 2
DISASSEMBLY
7
CX-JDS20/JDS50
Note: Follow the disassembly procedure in the numerical order given.
2-2. TOP PANEL, SIDE PANEL
6
4
four screws
(Case 3)
left panel
5
two screws
(+BVTP 3
×
10)
9
qa
top panel
q;
7
three screws
(+BVTP 3
8
3
right panel
×
10)
2-3. FRONT SECTION
6
screw
(+BVTP)(B3)
7
screw
(+KTP 3
2
two screws
(+BVTP 3
1
four screws
(Case 3)
2
wire (flat type)
(15core) (CN604)
3
connector
(6p) (cassette deck)
8
screw
(+BVTP)(B3)
×
6)
×
10)
4
wire (flat type)
(27core) (CN604)
1
wire (flat type)
(11core) (CN112)
9
5
three screws
(+BVTP)(B3)
front section
8
2-4. CD MECHANISM SECTION
2
CD mechanism section
CX-JDS20/JDS50
1
two screws
(+BVTP)(B3)
2-5. CASSETTE MECHANISM DECK, DS-PAI/HP/MIC BOARD
2
wire (flat type)
(8core)
6
holder
(PWB MIC)
4
cassette mechanism deck
3
three screws
(+PTP)(B2.6)
1
three screws
(+PTP)(B2.6)
7
DS-PAI/HP/MIC board
5
two screws
(+PTP)(B2.6)
9
CX-JDS20/JDS50
2-6. DS-PANEL BOARD
1
knob (RTRY)
2
guide (LED VOL)
3
knob (RTRY AMS)
6
DS-PANEL board
2-7. REAR CABINET
2
wire (flat type)
(11core)
1
connector
(2p) (CN871)
4
rear cabinet
4
twenty screws
(+PTP)(B2.6)
3
connector
(11p) (CN651)
3
four screws
(+BVTP)(B3)
10
2-8. PO WER TRANS
1
four screws
3
power trans
CX-JDS20/JDS50
2
cord bushing
2-9. DS-MAIN BOARD, HEAT SINK
5
DS-MAIN board
2
two screws
(+BVTP)(B3)
4
connector
3
screw
(+BVTP)(B3)
6
heat sink
1
two screws
(+BVTP)(B3)
11
CX-JDS20/JDS50
2-10. HOLDER (CD MECH)
5
3
tape
s
crew (+BVTP 2.6 × 8)
6
DS CONN board
1
four s
crews (+BVTP 2.6 × 8)
7
holder (CD MECH)
2
wire (flat type)
(27 core) (CN606)
4
wire (flat type)
(27 core)
2-11. BASE UNIT (BU-F1BD81A), CD MECH
3
two floating
(+PTPWH M2.6)
4
two
(insulator)
screws
coil springs
5
wire (flat type)
(27 core)
1
two floating
(+PTPWH M2.6)
2
two
(insulator)
6
base unit
(BU-F1BD81A)
screws
coil springs
12
7
tray panel
8
CD mech
2-12. BD BOARD, OPTICAL PICK-UP (KSM-215DCP/C2NP)
s
5
B
D board
4
Remove the four solderings of motor.
7
two
insulators
1
s
crew (+BVTP 2.6 × 8)
2
gap tube
3
wire (flat type)
(16 core)
CX-JDS20/JDS50
2-13. FRAME
8
optical pick-up
(KSM-215DCP/C2NP)
1
6
four s
2
two
crew
frame
insulators
13
CX-JDS20/JDS50
2-14. BELT
1
Release the
hook of the tray.
2
Slide the upper-most tray foward the front.
4
two belts
3
While pushing up the plate cam,
d
raw the Drawer (three trays) entirely foward front.
14
plate cam
2-15. CASSETTE PANEL
CX-JDS20/JDS50
2
Open the
cassette panel.
1
Push the
cassette panel.
3
two claws
4
cassette panel
15
CX-JDS20/JDS50
SECTION 3
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 ?/1 button to turn the set on.
2. Press three buttons x , X and [i-Bass] simultaneously.
3. The fluorescent indicator tube does not display any message
and the set is reset.
[Version Display Mode]
*The version of the microcomputer is displayed.
Procedure:
1. Press the ?/1 button to turn the set on.
2. To enter the test mode, press three buttons x , [DISPLAY]
and ?/1 simultaneously. The version of the microcomputer
is displayed.
[P ANEL Test]
* All fluorescent segments are tested.
Procedure:
1. Press the ?/1 button to turn the set on.
2. Press three buttons x , [DISPLAY] and ?/1 simultaneously.
3. Then all segments of the florescent indicator tube are turned
on.
[KEY Test]
*Keyboard check
Procedure:
1. When the panel test mode is activated. Press x and [DISC 1]
buttons simultaneously, and the key check mode is activated.
2. The message “KEY 0 0 0” is displayed.
3. Press x , and [DISC 1] buttons simultaneously, and the key
count mode is activated.
4. The message “KEYCNT 0” is displayed.
Each time a button is pressed, “KEYCNT 0” value increased.
However, once a button is pressed, it is no longer take into
account.
[CD Ship (LOCK) & COLD RESET MODE]
Procedure:
1. Press the ?/1 button to turn the set on.
2. Select the function “CD”.
3. Press the ?/1 button to turn the set off.
4. Press three buttons x , [i-Bass] and [DISC 3] simultaneously.
5. The “LOCK” display blinks instantaneously and CD ship mode
is set.
6. The Cold Reset Mode is set.
[Disc T ray Lock]
The disc tray lock function for the antitheft of an demonstration
disc in the store is equipped.
Setting Procedure :
1. Press the ?/1 button to turn the set on.
2. Press two buttons of x and Z simultaneously for five
seconds.
3. The message “LOCKED” is displayed and the tray is locked.
Releasing Procedure :
1. Press two buttons of x and Z simultaneously for five
seconds again.
2. 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 ?/1 button.
[Common Test]
*This mode is used to check the function of the amplifier.
Procedure:
1. Press the ?/1 button to turn the set on.
2. Press three buttons x , [DISPLAY] and ?/1 simultaneously.
3. The message “Volume MAX” is displayed, when the
[VOLUME] knob is rotated clockwise. The message “Volume
MIN” is displayed, when the [VOLUME] knob is rotated
counterclockwise.
4. Each time the [BASS] , [TREBLE] and [MIDDLE] knob is turned,
the message “EQ MAX”, “EQ MIN” or “EQ FLAT” is
displayed in this order.
[AM Channel Step 9 kHz/10kHz Selection Mode]
* Either the 9 kHz step or 10 kHz step can be selected for the
AM channel step. (EXCEPT AEP,UK,RU)
Procedure:
1. Set the FUNCTION to AM.
2. While depressing the [PLAY MODE/TUNING MODE] button,
press the ?/1 button.
3. The channel step is changed over.
[CD Repeat 5 Times Limit Release Mode]
Procedure:
1. Press the ?/1 button to turn the set on.
2. Select the FUNCTION to CD.
3. Press three buttons x , [DISPLAY] and [DISC 1] simulta-
neously.
4. The repeat all mark blinks and then repeat 5 times limit is
released.
[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 ?/1 button to turn the set on.
2. Set the FUNCTION to CD.
3. Press three buttons x , ML and [DISPLAY] simulta-
neously for more than two seconds.
4. After a message “LOCK” is displayed on the fluorescent
indicator tube, the CD ship mode is set and the power is turned
off.
16
SECTION 4
set
DS-MAIN board
SPEAKER terminal (J171)
L-CH, R-CH
+
–
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
MECHANICAL ADJUSTMENTS
CX-JDS20/JDS50
SECTION 5
ELECTRICAL ADJUSTMENTS
TAPE MECHANISM DECK SECTION
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads pinch rollers
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to
the parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
Mode
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension
Torque meter Meter reading
2.94 – 7.84 mN • m
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
(30 to 79 g • cm)
(0.42 – 1.11 oz • inch)
0.15 – 0.59 mN • m
(2 to 6 g • cm)
(0.03 – 0.08 oz • inch)
2.94 – 7.84 mN • m
(30 to 79 g • cm)
(0.42 – 1.11 oz • inch)
0.15 – 0.59 mN • m
(2 to 6 g • cm)
(0.03 – 0.08 oz • inch)
6.86 – 17.64 mN • m
(70 to 179 g • cm)
(0.98 – 2.49 oz • inch)
0.98 mN • m or more
(10 • cm or more)
(0.14 oz • inch or more)
0.98 mN • m or more
(10 • cm or more)
(0.14 oz • inch or more)
DECK SECTION 0 dB=0.775V
Precaution
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to
the parts adjusted.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in
this service manual. (As a general rule, playback circuit
adjustment should be completed before performing recording
circuit adjustment.)
6. The adjustments should be performed for both L-CH and RCH.
7. Switches and controls should be set as follows unless otherwise
specified.
• Test Tape
Signal Used forTape
P-4-A100
WS-48B
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode : Playback
10 kHz, –10 dB
3 kHz, 0 dB
Azimuth Adjustment
Tape Speed Check
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1 dB of peak.
Output
level
within
1dB
L-CH
peak
R-CH
peak
within
1dB
Screw
position
L-CH
peak
Screw
position
R-CH
peak
17
CX-JDS20/JDS50
)
3. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
L-CH
set
R-CH
in phase 45°90°135°180
DS-MAIN board
SPEAKER terminal (J171)
L-CH
R-CH
waveform of oscilloscope
good
oscilloscope
wrong
H
V
°
4. After the adjustments, apply suitable locking compound to
the parts adjusted.
Adjustment Location: Record/Playback/Erase Head
Record Bias Adjustment
Procedure:
1. Record mode
DS-MAIN board
AUX IN (J552)
1) 315 Hz
AF OSC
2) 10 kHz
attenuator
2. Mode: Playback
i-Bass OFF
BASS 0
TREBLE 0
recorded
portion
set
DS-MAIN board speaker terminal (J171
50 mV (–23.8 dB)
600
Ω
set
level meter
blank tape
CN-123
+
–
adjustment screw
Note: Refer to “2-15. Cassette Panel” (see page 15)
Tape Speed Check
Mode: Playback
test tape
WS-48B
(3 kHz, 0 dB)
set
DS-MAIN board
SPEAKER terminal (J171)
L-CH, R-CH
frequency counter
+
–
1. Insert the WS-48B into deck.
2. Press the nN button of deck.
3. Confirm that the frequency counter reads 3000 ± 90 Hz.
3. Confirm playback the signal recorded in step 1 become
adjustment level as follows.
Adjustment level: Playback output of 315 Hz to playback output
of 10 kHz: –2 ± 3.0 dB (0 ± 4.5mV).
Sample Value of Wow and flutter: 0.3% or less W.RMS (JIS)
(WS-48B)
18
CX-JDS20/JDS50
p
RFAC signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level: 1.0
±
0.4 Vp-p
CD SECTION
Note:
1. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
2. Use an oscilloscope with more than 10MΩ impedance.
3. 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
Connection:
oscilloscope
BD board
TP (FED)
TP (VC)
Procedure:
1. Connect an oscilloscope to test point TP (FEO) and TP (VC)
on the BD board.
2. Set the FUNCTION to “CD”.
3. While depressing the nN button, insert an AC plug.
4. Put the disc (YEDS-18) in and press the x button and actuate
the focus search. (actuate the focus search when disc table is
moving in and out)
5. Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And conf irm peak to peak level within 2 ± 1
Vp-p.
S-curve waveform
+
–
symmetry
RFDC signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level: 0.6
±
0.15 Vp-p
Checking Location: BD board (Side B)(See page 20)
RFAC Level Check
Connection:
oscilloscope
BD board
TP (RFACO)
TP (VC)
+
–
Procedure:
1. Connect an oscilloscope to test point TP (RFACO) 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.
Note: •Try to measure several times to make sure than the ratio of A : B
•Take sweep time as long as possible and light up the
Checking Location: BD board (Side B)(See page 20)
RFDC Level Check
Connection:
Procedure:
1. Connect an oscilloscope to test point (RFDCO) 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 RFDC
signal level is correct or not.
Note: A clear RFDC signal waveform means that the shape “◊” can
A
within 2
B
or B : A is more than 10 : 7.
brightness to obtain best waveform.
oscilloscope
BD board
TP (RFDCO)
TP (VC)
be clearly distinguished at the center of the waveform.
+
–
±
1 Vp-
Checking Location: BD board (Side B)(See page 20)
19
CX-JDS20/JDS50
)
E-F Balance Adjustment
Connection:
oscilloscope
BD board
TP (TEO)
TP (VC)
+
–
Procedure:
1. Connect an oscilloscpe to test point TP (TEO) and TP (VC)
on the BD board.
2. Set the FUNCTION to “CD”.
3. AC is put in pushing nN button to enter the CD test mode.
4. Put the disc (YEDS-18) in to playback the number five track.
5. Press the nN button. If it plays, press the nN button
again. (The tracking servo and the sledding servo are turned
OFF)
6. Check the level B of the oscilliscope’s waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ±10%
Traverse Waveform
0V
Center of
the waveform
B
A (DC
voltage
Checking Location:
– BD BOARD (Side B) –
IC251
TP
(VC)
TP
(TEO)
TP
(FEO)
TP
(RFDCO)
IC301
IC101
TP
(RFACO)
IC303
level: 1.0 ± 0.5 Vp-p
7. Press the nN button. (The tracking servo and sledding
servo are turned ON)
8. To exit from this mode, turn the power off.
Notes:•Always move the optical pick-up to most inside track when exiting
0V
from this mode. Otherwise, a disc will not be unloaded.
• Do not run the sled motor excessively, otherwise the gear can be
chipped.
Traverse Waveform
Tracking servo
Sled servo
OFF
Tracking servo
Sled servo
ON
C (DC
voltage)
Checking Location: BD board (Side B)
20
SECTION 6
DS-CONN board
DS-PANEL board
DS-AMPLIFIER board
BD board
DS-POWER board
DS-PAI/HP/MIC board
DS-MAIN board
DS-VOL board
DIAGRAMS
CX-JDS20/JDS50
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
For Schematic Diagrams.
Note:
• All capacitors are in µF unless otherwise noted. (p: pF)
50 WV or less are not indicated except f or electrolytics and
tantalums.
• All resistors are in Ω and 1/
specified.
• f : internal component.
• 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.
• H : adjustment for repair.
•Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
•Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production
tolerances.
No mark: CD STOP
•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
J : CD
d : AUX
E : PB (TAPE)
a : REC (TAPE)
N : MIC
•Abbreviation
AUS: Australian model.
E51 : Chilean and Peruvian model.
MX : Mexican model.
RU : Russian model.
4
W or less unless otherwise
For Printed Wiring Boards.
Note:
• X : parts extracted from the component side.
• : Pattern from the side which enables seeing.
Caution:
Pattern face side: P arts on the pattern face side seen from
(Side A) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Side B) the parts face are indicated.
• Indication of transistor.
C
B
B
Q
E
These are omitted.
CE
These are omitted.
• Circuit Boards Location
•Waveforms
– DS-PANEL Board –
1
500 mV/DIV, 10
2
1 V/DIV, 40 ns/DIV
IC604 0 (XCIN)
30.4 µs
µ
s/DIV
IC604 qg (XIN)
62.5 ns
1.2 Vp-p
2.3 Vp-p
CX-JDS20/JDS50
2121
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