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

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.

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.

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.

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

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

TUNER/BAND wh (14, 15)

Name of button/part Reference page

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

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

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

qg qf

9 q;

qa qs

Setting the clock

Use buttons on the remote for the operation.

Press ?/1 to turn on the system.

Press CLOCK/TIMER SET.

Press . or > repeatedly to set the hour.

Press ENTER.

Press . or > repeatedly to set the minute.

Press ENTER.

The clock starts working.

To adjust the clock

Press CLOCK/TIMER SET.

Press . or > repeatedly to select “CLOCK SET”, then press ENTER.

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).

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)

2-12. BD BOARD, OPTICAL PICK-UP

(KSM-215DCP/C2NP)

(Page 12)

2-13. FRAME, COVER CD

(Page 12)

2-14. BELT

(Page 13)

Note: Follow the disassembly procedure in the numerical order given.

2-2. TOP PANEL, SIDE PANEL

four screws (Case 3)

left panel

two screws (+BVTP)(B3)

top panel

two screws (+BVTP)(B3)

right panel

CX-JDS55

2-3. FRONT SECTION

wire (flat type)

(31core) (CN101)

screw (+BVTP)(B3)

connector (7p)

screw (+BVTP)(B3)

wire (flat type)

(13core) (CN604)

four screws (Case 3)

two screws (+BVTP)(B3)

screw (+KTP 3

three screws (+BVTP)(B3)

wire (flat type)

(11core) (CN112)

front section

screw (+BVTP)(B3)

(27core) (CN605)

wire (flat type)

CX-JDS55

2-4. CD MECHANISM SECTION

CD mechanism section

Remove the soldering.

two screws (+BVTP)(B3)

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

wire (flat type)

(7core)

knob (MIC)

holder

(PWB MIC)

earth wire

cassette mechanism deck

four screws (+BVTP)(B2.6)

screw (+BVTP)(B3)

two screws (+BVTP)(B2.6)

PAI/HP/MIC board

two screws (+BVTP)(B2.6)

2-6. PANEL BOARD

knob (RTRY)

knob (RTRY AMS)

guide (LED VOL)

screw

PANEL board

CX-JDS55

wire (flat type) (31 core)

2-7. REAR CABINET

wire (flat type)

(11core)

connector

(2p) (CN871)

rear cabinet

(11p) (CN651)

two screws

fourteen screws (+PTP)(B2.6)

connector

four screws (+BVTP)(B3)

CX-JDS55

2-8. POWER BOARD

four screws

POWER board

2-9. MAIN BOARD, AMP BOARD

MAIN board

connector

(CN171)

screw

cord bushing

two screws (+BVTP)(B3)

AMP board

two screws (+BVTP)(B3)

2-10. HOLDER (CD MECHANISM)

crew (+BVTP 3 × 8)

tape

CONTACT board

four s

crews (+BVTP 2.6 × 8)

holder (CD MECHANISM)

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

CX-JDS55

wire (flat type) (16 core)

2-11. BASE UNIT (BU-F1BD81AA)

two floating

(+PTPWH M2.6)

(insulator)

two

coil springs

screws

wire (flat type) (27 core)

two floating

(+PTPWH M2.6)

two

(insulator)

base unit

(BU-F1BD81AA)

screws

coil springs

tray panel

CX-JDS55

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

Remove the four solderings of motor.

two

insulators

crew (+BVTP 2.6 × 8)

gap tube

D board

wire (flat type) (16 core)

2-13. FRAME, COVER CD

earth wire

two screws (+BVTP)(B2.6)

cover CD

optical pick-up

(KSM-215DCP/C2NP)

earth wire

two screws (+BVTP)(B2.6)

two

insulators

four s

frame

crews

2-14. BELT

Slide the upper-most tray forward the front.

Release the

hook of the tray.

While pushing up the plate cam,

raw the Drawer (three trays) entirely forward front.

two belts

plate cam

CX-JDS55

2-15. CASSETTE PANEL

two claws

cassette panel

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.

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

back tension

REV

back tension

FF/REW

FWD tension

REV tension

Torque meter Meter reading

2.94 – 7.84 mN • m

CQ-102C

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

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

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)

CX-JDS55

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)

+ –

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.

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

Center of the waveform

A (DC voltage

Checking Location:

– BD BOARD (Side B) –

IC251

(VC)

(TEO)

(FEO)

(RFDCO)

IC301

IC101

(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

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

C (DC voltage)

Checking Location: BD board (Side B)

CX-JDS55

These are omitted.

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

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.

+ 44 hidden pages

Aiwa CX-JDS55 Service Manual

TABLE OF CONTENTS

2-1. DISASSEMBLY FLOW

2-2. TOP PANEL, SIDE PANEL

2-3. FRONT SECTION

2-4. CD MECHANISM SECTION

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

2-6. PANEL BOARD

2-7. REAR CABINET

2-8. POWER BOARD

2-9. MAIN BOARD, AMP BOARD

2-10. HOLDER (CD MECHANISM)

2-11. BASE UNIT (BU-F1BD81AA)

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

2-13. FRAME, COVER CD

2-14. BELT

2-15. CASSETTE PANEL