Aiwa CX-JDS55 Service Manual

CX-JDS55

SERVICE MANUAL

Ver. 1.0 2006.02

CX-JDS55 is the Amplifier, CD player, Tape Deck
and Tuner section in DBX-DS55.

CD
Section

TAPE Model Name Using Similar Mechanism CX-JDS50
Section T ape Transport Mechanism Type CMAL1Z240A

E Model

Model Name Using Similar Mechanism CX-JDS50
CD Mechanism Type BU-F1BD81AA
Optical Pick-up Name KSM-215DCP/C2NP

Amplifier section

The following measured at AC 120, 127, 220, 230,
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)

Inputs
AUDIO IN (stereo mini jack):

voltage 250 mV,
impedance 47 kilohms

MIC (phone jack) (except for European model):

sensitivity 1 mV,

impedance 10 kilohms
Outputs
PHONES (stereo mini jack):

accepts headphones of

8ohms or more

SPEAKER: accepts impedance of 6 to

16 ohms

CD player section

System Compact disc and digital

audio system

SPECIFICATIONS

Laser Diode Properties Emission duration:

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),

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range 87.5 – 108.0 MHz

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)

using Sony TYPE I
cassettes

(50 kHz step)

Antenna FM lead antenna
Antenna terminals 75 ohms unbalanced
Intermediate frequency 10.7 MHz

AM tuner section

Tuning range
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

— Continued on next page —

9-887-086-01

2006B1678-1
© 2006.02

COMPACT DISC DECK RECEIVER

Sony Corporation

Personal Audio Division
Published by Sony Techno Create Corporation

CX-JDS55

General

Power requirements
Mexican model: 127 V AC, 60 Hz
Other models: 120 V, 220 – 230 V or

Power consumption 160 watts

Dimensions (w/h/d) (excl. speakers):

Mass (excl. speakers)

Design and specifications are subject to change
without notice.

240 V AC, 50/60 Hz
Adjustable with voltage
selector

Approx. 230 × 365.5 ×
409 mm

Approx. 9.1 kg

MODEL IDENTIFICATION
– BACK PANEL –

Part No.

3

#

#

3

Model Part No.

E51 model 2-675-708-0[]
MX model 2-675-709-0[]

•Abbreviation
E51 : Chilean and Peruvian models
MX : Mexican model

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.

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

CX-JDS55

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. Set the FUNCTION to CD.

3. Insert a disc.

4. Press two buttons x and Z for five seconds.

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

6. Press two buttons x and Z for five seconds again.

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

8. To exit from this mode, press the ?/1 button to turn the
set off.

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.

TABLE OF CONTENTS

1. GENERAL ................................................................... 4

2. DISASSEMBLY

2-1. Disassembly Flow ........................................................... 6

2-2. Top Panel, Side Panel ...................................................... 7

2-3. Front Section ................................................................... 7

2-4. CD Mechanism Section ................................................... 8

2-5. Cassette Mechanism Deck, PAI/HP/MIC Board ............. 8

2-6. PANEL Board .................................................................. 9

2-7. Rear Cabinet .................................................................... 9

2-8. Power Board .................................................................... 10

2-9. MAIN Board, AMP Board .............................................. 10

2-10. Holder (CD Mechanism) ................................................. 11

2-11. Base Unit (BU-F1BD81AA) ........................................... 11

2-12. BD Board, Optical Pick-up (KSM-215DCP/C2NP) ....... 12

2-13. Frame, Cover CD............................................................. 12

2-14. Belt .................................................................................. 13

2-15. Cassette Panel .................................................................. 14

3. TEST MODE ............................................................... 15

4. MECHANICAL ADJUSTMENTS......................... 16

5. ELECTRICAL ADJUSTMENTS .......................... 16

6. DIAGRAMS

6-1. Block Diagram – BD Section – ...................................... 22

6-2. Block Diagram – MAIN Section – ................................. 23

6-3. Printed Wiring Board – BD Board – .............................. 24

6-4. Schematic Diagram – BD Board – ................................ 25

6-5. Printed Wiring Board – MAIN Board – ......................... 26

6-6. Schematic Diagram – MAIN Board (1/3) – .................. 27

6-7. Schematic Diagram – MAIN Board (2/3) – .................. 28

6-8. Schematic Diagram – MAIN Board (3/3) – .................. 29

6-9. Printed Wiring Board – PANEL Section – ..................... 30

6-10. Schematic Diagram – PANEL Section (1/2) – .............. 31

6-11. Schematic Diagram – PANEL Section (2/2) – .............. 32

6-12. Printed Wiring Board – FRONT BLOCK Section – ...... 33

6-13. Schematic Diagram – FRONT BLOCK Section – ......... 34

6-14. Printed Wiring Board – AMP Board – ........................... 35

6-15. Schematic Diagram – AMP Board – .............................. 36

6-16. Printed Wiring Board – POWER Board – ...................... 37

6-17. Schematic Diagram – POWER Board – ......................... 38

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.

7. EXPLODED VIEWS

7-1. Overall Section ................................................................ 46

7-2. Front Section ................................................................... 47

7-3. Chassis Section ................................................................ 48

7-4. CD Mechanism Section-1 ............................................... 49

7-5. CD Mechanism Section-2 ............................................... 50

8. ELECTRICAL PARTS LIST .................................. 51

3

CX-JDS55

Illustrati

List of button locations and reference pages

SECTION 1

GENERAL

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)

MIC jack
MIC LEVEL qk (21)
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)

qj (21)

21)

on number

r

TUNER/BAND wh (14, 15)

Name of button/part 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)

nN
X (pause) wl (10, 17, 31)

(play) wl (10, 17, 18)

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

4

Remote control

CX-JDS55

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)
./> (goback/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).

5

CX-JDS55

2-1. DISASSEMBLY FLOW

•This set can be disassembled in the order shown below.

SET

SECTION 2

DISASSEMBLY

2-2. TOP PANEL, SIDE PANEL

(Page 7)

2-3. FRONT SECTION

(Page 7)

2-4. CD MECHANISM SECTION

(Page 8)

2-7. REAR CABINET

(Page 9)

2-8. POWER BOARD

(Page 10)

2-15. CASSETTE PANEL

(Page 14)

2-5. CASSETTE MECHANISM DECK,

PAI/HP/MIC BOARD

(Page 8)

2-9. MAIN BOARD,

AMP BOARD

(Page 10)

(CD MECHANISM)

2-11. BASE UNIT (BU-F1BD81AA)

2-6. PANEL BOARD

(Page 9)

2-10. HOLDER

(Page 11)

(Page 11)

2-12. BD BOARD, OPTICAL PICK-UP

(KSM-215DCP/C2NP)

(Page 12)

2-13. FRAME, COVER CD

(Page 12)

2-14. BELT

(Page 13)

6

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)(B3)

9

qa

top panel

q;

7

two screws
(+BVTP)(B3)

8

3

right panel

CX-JDS55

2-3. FRONT SECTION

5

wire (flat type)

(31core) (CN101)

7

screw
(+BVTP)(B3)

3

connector (7p)

q;

screw
(+BVTP)(B3)

2

wire (flat type)

(13core) (CN604)

2

1

four screws
(Case 3)

two screws
(+BVTP)(B3)

8

screw
(+KTP 3

×

6)

6

three screws
(+BVTP)(B3)

9

1

wire (flat type)

(11core) (CN112)

qa

front section

4

screw
(+BVTP)(B3)

(27core) (CN605)

wire (flat type)

7

CX-JDS55

2-4. CD MECHANISM SECTION

5

CD mechanism section

1

Remove the soldering.

4

two screws
(+BVTP)(B3)

2-5. CASSETTE MECHANISM DECK, PAI/HP/MIC BOARD

1

wire (flat type)

(7core)

4

knob (MIC)

7

holder

(PWB MIC)

3

earth wire

3

cassette mechanism deck

2

four screws
(+BVTP)(B2.6)

2

screw
(+BVTP)(B3)

5

two screws
(+BVTP)(B2.6)

8

PAI/HP/MIC board

6

two screws
(+BVTP)(B2.6)

8

2-6. PANEL BOARD

1

knob (RTRY)

3

knob (RTRY AMS)

2

guide (LED VOL)

4

screw

9

PANEL board

CX-JDS55

8

wire (flat type)
(31 core)

2-7. REAR CABINET

2

wire (flat type)

(11core)

1

connector

(2p) (CN871)

4

rear cabinet

6

7

(11p) (CN651)

5

two screws

fourteen screws
(+PTP)(B2.6)

connector

3

four screws
(+BVTP)(B3)

9

CX-JDS55

2-8. POWER BOARD

1

four screws

3

POWER board

2-9. MAIN BOARD, AMP BOARD

5

MAIN board

4

connector

(CN171)

3

screw

2

cord bushing

10

2

two screws
(+BVTP)(B3)

6

AMP board

1

two screws
(+BVTP)(B3)

2-10. HOLDER (CD MECHANISM)

5

s

crew (+BVTP 3 × 8)

3

tape

6

CONTACT board

1

four s

crews (+BVTP 2.6 × 8)

7

holder (CD MECHANISM)

2

wire (flat type)
(27 core) (CN606)

CX-JDS55

4

wire (flat type)
(16 core)

2-11. BASE UNIT (BU-F1BD81AA)

3

two floating

(+PTPWH M2.6)

4

(insulator)

two

coil springs

screws

5

wire (flat type)
(27 core)

1

two floating

(+PTPWH M2.6)

2

two

(insulator)

6

base unit

(BU-F1BD81AA)

screws

coil springs

7

tray panel

11

CX-JDS55

2-12. BD BOARD, OPTICAL PICK-UP (KSM-215DCP/C2NP)

4

Remove the four solderings of motor.

7

two

insulators

1

s

crew (+BVTP 2.6 × 8)

2

gap tube

5

B

D board

3

wire (flat type)
(16 core)

2-13. FRAME, COVER CD

2

earth wire

1

two screws
(+BVTP)(B2.6)

5

cover CD

8

optical pick-up

(KSM-215DCP/C2NP)

4

earth wire

3

two screws
(+BVTP)(B2.6)

6

two

insulators

6

four s

7

frame

crews

12

2-14. BELT

2

Slide the upper-most tray forward the front.

1

Release the

hook of the tray.

3

While pushing up the plate cam,

d

raw the Drawer (three trays) entirely forward front.

4

two belts

plate cam

CX-JDS55

13

CX-JDS55

2-15. CASSETTE PANEL

2

1

two claws

3

4

cassette panel

14

SECTION 3

TEST MODE

CX-JDS55

[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 model name and destination
are displayed.

3. Press the [DISPLAY] button, the version is displayed.

4. To exit from this mode, press three buttons x , [DISPLAY]
and ?/1 simultaneously.

[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 [DISC 3] 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.

5. To exit from this mode, pull out the AC plug.

[CD Ship (LOCK) & COLD RESET MODE]

Procedure:

1. Press the ?/1 button to turn the set on.

2. Select the FUNCTION to CD.

3. Press three buttons x , [i-Bass] and [DISC 3] simultaneously.

4. The “RESET” display blinks instantaneously and CD ship
mode is set.

5. 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. Select the FUNCTION to CD.

3. Insert a disc.

4. Press two buttons x and Z for five seconds.

5. The message “LOCKED” is displayed and the tray is locked.

Releasing Procedure :

1. Press two buttons x and Z for five seconds again.

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

3. To exit from this mode, press the ?/1 button.

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 , [REC PAUSE/START] and [i-Bass]
simultaneously.

3. The message “COMMON” is displayed, when the [VOLUME]
knob is rotated clockwise. The message “VOL MAX”
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.

5. To exit from this mode, press the ?/1 button.

[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.

Procedure:

1. Set the FUNCTION to AM.

2. Press the ?/1 button to turn the set off.

3. While depressing the [PLAY MODE/TUNING MODE] button,
press the ?/1 button.

4. 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.

5. To exit from this mode, press the ?/1 button.

[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.

15

CX-JDS55

set

MAIN board
SPEAKER terminal (J171)
L-CH, R-CH

+
–

level meter

test tape
P-4-A100
(10 kHz, –10 dB)

SECTION 4

MECHANICAL ADJUSTMENTS

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

16

CX-JDS55

attenuator

set

PAI/HP/MIC board
AUDIO IN (J552)

1) 315 Hz

2) 10 kHz

50 mV (–23.8 dB)





600

Ω

blank tape
CN-123

AF OSC

3. Mode: Playback

test tape
P-4-A100
(10 kHz, –10 dB)

L-CH

set

R-CH

in phase 45°90°135°180

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

2. Mode: Playback
i-Bass OFF
BASS 0
TREBLE 0

recorded
portion

set

MAIN board speaker terminal (J171)

level meter

+
–

adjustment screw

Note: Refer to “2-15. Cassette Panel” (see page 14)

Tape Speed Check

Mode: Playback

test tape
WS-48B
(3 kHz, 0 dB)

set

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)

17

CX-JDS55

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 (FEO)
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 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.

Checking Location: BD board (Side B)(See page 19)

+
–

A

B

symmetry

within 2

±

1 Vp-

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 19)

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.

RFAC signal waveform

VOLT/DIV: 200 mV
TIME/DIV: 500 ns

level: 1.0

±

0.4 Vp-p

Checking Location: BD board (Side B)(See page 19)

RFDC Level Check

Connection:

oscilloscope

BD board

TP (RFDCO)

TP (VC)

+
–

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

be clearly distinguished at the center of the waveform.

18

CX-JDS55

)

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)

19

CX-JDS55

C

B

These are omitted.

E

Q

B

These are omitted.

CE

SECTION 6

DIAGRAMS

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.

• H : adjustment for repair.

• A : B+ Line.

• B : B– Line.

•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
E51 : Chilean and Peruvian models
MX : Mexican 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 B) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Side A) the parts face are indicated.

• Indication of transistor.

20