Sharp CDC-290-X Service manual

SERVICE MANUAL

CD-C290X

CD-C290X mini component system consisting of
CD-C290X mini component system,CP-C290
speaker system.

CD-C290X

No. S9910CDC290X

● SRS technology Licensed from SRS Labs. SRS technol­ogy holds the following patents: U.S. Patent No.
4,748,669 and U.S. Patent No. 4,841,572.

● SRS, the SRS Logo (●) and the Sound Retrieval System
are registered trademarks of SRS Labs, Inc. in the United
States.

• In the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified be
used.

CONTENTS

SAFETY PRECAUTION FOR SEVICE MANUAL............................................................................................................. 2

VOLTAGE SELECTION.................................................................................................................................................... 2

SPECIFICATIONS ............................................................................................................................................................ 3

NAMES OF PARTS .......................................................................................................................................................... 4

OPERATION MANUAL..................................................................................................................................................... 6

DISASSEMBLY..................................................................................................................................................................7

REMOVING AND REINSTALLING THE MAIN PARTS.................................................................................................... 9

ADJUSTMENT................................................................................................................................................................ 10

NOTES ON SCHEMATIC DIAGRAM ............................................................................................................................. 12

BLOCK DIAGRAM .......................................................................................................................................................... 13

WAVEFORMS OF CD CIRCUIT..................................................................................................................................... 16

SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD.............................................................................................17

TROUBLESHOOTING (CD CHANGER CONTROL / CD SECTION) ............................................................................ 34

FUNCTION TABLE OF IC .............................................................................................................................................. 38

FL DISPLAY.....................................................................................................................................................................45

REPLACEMENT PARTS LIST/EXPLODED VIEW

Page

SHARP CORPORATION

– 1 –

This document has been published to be used
for after sales service only.
The contents are subject to change without notice.

CD-C290X

SAFETY PRECAUTION FOR

SERVICE MANUAL

Precaution to be taken when replacing and servicing the
Laser Pickup.

The AEL (Accessible Emission Level) of Laser Power Output
for this model is specified to be lower than Class I Requirements.
However, the following precautions must be observed during
servicing to protect your eyes against exposure to the Laser
beam

(1) When the cabinet has been removed, the power is turned

on without a compact disc, and the Pickup is on a position
outer than the lead-in position, the Laser will light for several
seconds to detect a disc. Do not look into the Pickup Lens.

(2) The Laser Power Output of the Pickup inside the unit and

replacement service parts have already been adjusted prior
to shipping.

(3) No adjustment to the Laser Power should be attempted

when replacing or servicing the Pickup.

(4) Under no circumstances look directly into the Pickup Lens

at any time.

(5) CAUTION - Use of controls or adjustments, or performance

of procedures other than those specified herein may result
in hazardous radiation exposure.

Laser Diode Properties

Material: GaAIAs
Wavelength: 780 nm
Emission Duration: continuous
Laser Output: max. 0.6 mW

Laser Diode Properties
Material: GaAIAs
Wavelength: 780 nm
Emission Duration: continuous
Laser Output: max. 0.6 mW

CAUTION-INVISIBLE LASER RADIATION WHEN OPEN. DO NOT STARE INTO
BEAM OR VIEW DIRECTLY WITH OPTICAL INSTRUMENTS.

VARNING-OSYNLIG LASERSTRALNING NAR DENNA DEL AR OPPNAD. STIRRA
EJ IN I STRALEN OCH BETRAKTA EJ STRALEN MED OPTISKA INSTRUMENT.

ADVERSEL-USYNLIG LASERSTRALING VED ABNING. SE IKKE IND I
STRALEN-HELLER IKKE MED OPTISKE INSTRUMENTER.

VARO! AVATTAESSA OLET ALTTIINA NAKYMATON LASERSATEILYLLE.
ALA TUIJOTA SATEESEEN ALAKA KATSO SITA OPTISEN LAITTEEN LAPI.

VARNING-OSYNLIG LASERSTRALNING NAR DENNA DEL AR OPPNAD.
STIRRA EJ IN I STRALEN OCH BETRAKTA EJ STRALEN GENOM OPTISKT
INSTRUMENT.

ADVERSEL-USYNLIG LASERSTRALING NAR DEKSEL APNES. STIRR IKKE
INN I STRALEN ELLER SE DIREKTE MED OPTISKE INSTRUMENTER.

CAUTION

This Mini Component System is classified as a CLASS
1 LASER product.

The CLASS 1 LASER PRODUCT label is located on the
rear cover.

Use of controls, adjustments or performance of proce­dures other than those specified herein may result in haz­ardous radiation exposure.

As the laser beam used in this compact disc player is
harmful to the eyes, do not attempt to disassemble the
cabinet. Refer servicing to qualified personnel only.

VOLTAGE SELECTION

The voltage selector is located on the AC voltage selector box. If adjustment is necessary, ensure to remove plug of AC cord from
AC socket and use a screwdriver to turn the selector in either direction. The correct voltage figure is displayed in the window below
to the adjustment screw.

QACCE0007AW00

QPLGA0004AWZZ

Figure 2 POWER SUPPLY CORD AND PLUG ADAPTOR

– 2 –

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.

SPECIFICATIONS

CD-C290X

General

Power source: AC 110/127/220/230-240 V,

50/60 Hz

Power consumption: 47 W
Dimensions: Width; 270 mm (10-5/8")

Height; 303 mm (11-13/16")
Depth; 341 mm (13-7/16")

Weight: 5.6 kg (12.3 lbs.)

Amplifier section

Output power: PMPO; 600 W (total)

MPO; 60 W (30 W + 30 W)
(10 % T.H.D.)
RMS; 40 W (20 W + 20 W)
(10 % T.H.D.)
RMS; 28 W (14 W + 14 W)
(0.9 % T.H.D.)

Output terminals: Speakers; 4 ohms

Headphones; 16-50 ohms
(recommended; 32 ohms)

Input terminals: Video/Auxiliary (audio signal);

245 mV/47 kohms

Tuner section

Frequency range: FM; 88-108 MHz

AM; 531-1,602 kHz

Cassette deck section

Frequency
response: 50-14,000 Hz (Normal tape)
Signal/noise ratio: 55 dB (TAPE 1, playback)

50 dB (TAPE 2, recording/
playback)

Wow and flutter: 0.15 % (WRMS)

Compact disc player section

Type: 3-disc multi-play compact disc player
Signal readout: Non-contact, 3-beam semi-

conductor laser pickup

D/A converter: 1-bit D/A converter
Frequency response: 20 - 20,000 Hz
Dynamic range: 90 dB (1 kHz)

Speaker section

Type: 2-way [10 cm (4") woofer and 5 cm

(2") tweeter]

Rated input power: 20 W
Maximum input power: 40 W
Impedance: 4 ohms
Dimensions: Width; 180 mm (7-1/8")

Height; 300 mm (11-13/16")
Depth; 204 mm (8-1/16")

Weight: 2.1 kg (4.6 lbs.)/each

Specifications for this model are subject to change
without prior notice.

– 3 –

CD-C290X

CD-C290X

NAMES OF PARTS

Front panel

11. Disc Tray

12. Disc Number Select Buttons

13. Disc Skip Button

14. Open/Close Button:

15. Disc Number Indicator

16. Timer Indicator

17. Record Indicator

18. Sleep Indicator

19. Extra Bass Indicator: X-BASS

10. Memory Indicator

11. FM Stereo Mode Indicator: ST

12. FM Stereo Indicator:

13. CD Play Indicator:

14. CD Repeat Indicator:

15. SRS Indicator: SRS ( )

16. CD Pause Indicator:

17. On/Stand-by Button

18. Memory/Set Button

19. Record Pause Button:

20. Extra Bass/Equalizer Mode Button: X-BASS

21. Volume Up/Down Buttons: /

22. Function Selector Buttons

23. Clock Button

24. Timer/Sleep Button

25. (CD) Track Down/Review Button:

3 (TUNER) Preset Down Button:

26. Stop Button:

27. Play/Repeat Button:

28. (CD) Track Up/Cue Button:

3 (TUNER) Preset Up Button:

29. 3D Surround Mode Button

30. Tuning and Time Up/Down Buttons:

31. Headphone Socket

1

56789

REC

1 2 3

SLEEP

17 18 19 20 21

22

23

24 25

32 33

23

X-BASS

13

14

15

26

27 28 29

4

101112

MEMORY ST
SRS ( )

kHz
MHz

16

30
31

32. (TAPE 1) Cassette Compartment

33. (TAPE 2) Cassette Compartment

– 4 –

Rear panel

11. Span Selector Switch

12. Speaker Terminals

13. AC Voltage Selector

14. AC Power Input Socket

15. Video/Auxiliary (Audio Signal) Input Sockets

16. FM 75 Ohms Aerial Terminal

17. Aerial Earth Terminal

18. AM Aerial Terminal

CP-C290

Speaker section

19. Tweeter

10. Woofer

11. Bass Reflex Duct

12. Speaker Wire

9

10

11

CD-C290X

1

2
3

4

5
6

7
8

Remote control

11. Remote Control Transmitter LED

CD control section

12. Disc Number Select Buttons

13. Track Down/Review Button: /

14. Track Up/Cue Button: /

15. Disc Skip Button

16. Play/Repeat Button:

17. Stop Button:

18. Memory Button

19. Clear Button

10. Random Button

11. Pause Button:

Tuner control section

12. Preset Up/Down Buttons: /

Tape control section

13. (TAPE 1/2) Stop Button:

14. (TAPE 1) Play Button:

15. (TAPE 2) Record Pause Button:

16. (TAPE 2) Play Button:

17. (TAPE 2) Rewind Button:

18. (TAPE 2) Fast Forward Button:

19. Function Selector Buttons

20. Extra Bass/Equalizer Mode Button

21. 3D Surround Mode Button

22. On/Stand-by Button

23. Volume Up/Down Buttons: /

13
14

15
19

21
22

12

1

2

5
6

3
4

8

109

7

11

12

16

17

18

20

23

– 5 –

CD-C290X

RESETTING THE MICROCOMPUTER

Reset the microcomputer under the following conditions:

To erase all of the stored memory contents (clock and timer

settings, and tuner and CD presets).

If the display is not correct.

If the operation is not correct.

1

Press the ON/STAND-BY button to enter the stand-by mode.

2

While pressing down the VOLUME button and the

button, hold down the ON/STAND-BY button for at least

1 second.

1,2

2

2

Caution:

The operation explained above will erase all data stored in

memory including clock and timer settings, and tuner and CD

presets.

SETTING THE CLOCK

1

Press the ON/STAND-BY button to enter the stand-by mode.

2

Press the CLOCK button.

3

Within 5 seconds, press the MEMORY/SET button.

4

Press the TUNING/TIME ( or ) button to select the time

display mode.

"AM 12:0 0"

The 12-hour display will appear.

(AM 12:00 - PM 11:59)

"AM 0:00 "

The 12-hou r display will appear.

(AM 0:00 - PM 11:59)

"0:00"

The 24- hour displa y will appear.

(0:00 - 23:59)

Note that this can only be set when the unit is first installed

or it has been reset (see page 17).

5

Press the MEMORY/SET button.

6

Press the TUNING/TIME ( or ) button to adjust the hour.

Press the TUNING/TIME ( or ) button once to advance

the time by 1 hour. Hold it down to advance continuously.

When the 12-hour display is selected, "AM" will change auto-

matically to "PM".

7

Press the MEMORY/SET button.

8

Press the TUNING/TIME ( or ) button to adjust the

minutes.

Press the TUNING/TIME ( or ) button once to advance

the time by 1 minute. Hold it down to change the time in 5

minute intervals.

The hour setting will not advance even if minutes advance

from "59" to "00".

9

Press the MEMORY/SET button.

The clock starts operating from "0" seconds. (Seconds are

not displayed.)

Note:

In the event of a power failure or when the AC power lead

is disconnected, the clock display will go out.

When the AC power supply is restored, the clock display will

flash on and off to indicate the time when the power failure

occurred or when the AC power lead was disconnected.

ON/

STAND-BY

CLOCK

MEMORY/

SET

TUNING/

TIME

( )

AM 0:00AM 12:00 0:00

2

3

4

7

6

5

8

9

If this happens, follow the procedure below to change the

clock time.

To change the clock time:

When the unit is in the stand-by mode:

Press the MEMORY/SET button.

Perform steps 6 - 9 above.

When the unit is on:

Press the CLOCK button.

Within 5 seconds, press the MEMORY/SET button.

Perform steps 6 - 9 above.

To see the time display:

Press the CLOCK button.

● The time display will appear for about 5 seconds.

To change the time display mode:

Perform steps 1 - 2 in the section "RESETTING THE MICRO-

COMPUTER", on page 17.

Perform steps 1 - 9 above.

(Main unit operation)

In this example, the clock is set for the

24-hour (0:00) system.

PREPARTION FOR USE

Notes concerning use:

Replace the batteries if the operating distance becomes re-

duced or if operation becomes erratic.

Periodically clean the transmitter LED on the remote control

and the sensor on the main unit with a soft cloth.

Exposing the sensor on the main unit to strong light may

interfere with operation. Change the lighting or the direction

of the unit.

Keep the remote control away from moisture, excessive heat,

shock, and vibrations.

15

15

15

15

0.2 m - 6 m

(8" - 20')

OPERATION MANUAL

– 6 –

DISASSEMBLY

Caution on Disassembly

Follow the below-mentioned notes when disassembling
the unit and reassembling it, to keep it safe and ensure
excellent performance:

1. Take cassette tape and compact disc out of the unit.

2. Be sure to remove the power supply plug from the wall
outlet before starting to disassemble the unit.

3. Take off nylon bands or wire holders where they need to
be removed when disassembling the unit. After servicing
the unit, be sure to rearrange the leads where they were
before disassembling.

4. Take sufficient care on static electricity of integrated
circuits and other circuits when servicing.

CD-C290X

STEP REMOVAL PROCEDURE FIGURE

1 Top Cabinet 1. Screw ..................... (A1) x4 7-1

2 Side Panel 1. Screw ..................... (B1) x2 7-1

(Left/right) 2. Screw..................... (B2) x4

3 CD Player Unit/ 1. Turn on the power supply, 7-2

CD Tray Cover open the disc tray, take out

4 Back Board 1. Screw .................... (D1) x6 7-2

5 Tuner PWB 1. Screw .................... (E1) x3 8-1

6 Switch PWB/ 1. Screw .................... (F1) x6 8-1.2

Display PWB/ 2. Screw .................... (F2) x1

Main PWB/ 4. Socket ................... (F4) x4

7

Front Panel

8 Tape Mechanism 1. Open the cassette holder. 8-2

9 SRS PWB 1.Screw ..................... (J1) x1 8-3

10 Turntable 1. Screw .................... (K1) x1 8-4

11

Disc Tray

12 CD Changer 1. Screw .................... (M1) x4 8-5

Mechanism

13 CD Mechanism 1. Screw .................... (N1) x1 8-5

the CD cover, and close.
(Note 1)

2. Hook...................... (C1) x3

3. Hook...................... (C2) x2

4. Socket ................... (C3) x4

5. Flat Wire................ (C4) x1 7-3

4. Socket ................... (C5) x1

2. Socket ................... (E2) x1

3. Screw .................... (F3) x1

1. Screw .................... (G1) x3 8-2

2. Hook...................... (G2) x2

2. Screw .................... (H1) x6

2. Cover .................... (K2) x1

1. Screw .................... (L1) x2 8-4

2. Guide .................... (L2) x2

( B1 ) x1
ø3 x10mm

Side Panel
(Right)

( B2 ) x2
ø3 x12mm

A

CD Player Unit

Back Board

CD-C290X

( A1 ) x2
ø3 x12mm

Back Board

( D1 ) x6
ø3 x8mm

( B2 ) x2
ø3 x12mm

Figure 7-1

(C2) x1

Pull

Figure 7-2

Top Cabinet

CD Tray Cover

Main PWB

CD-C290X

( A1 ) x2
ø3 x12mm

Side Panel
(Left)

( B1 ) x1
ø3 x10mm

Hook

1

( C1) x3

1

2

( C2 ) x1

Front Panel

( C3 ) x4

Note 1:

How to open the changer manually. (Fig.7-4)

1. Insert the tip of fine screwdriver into the hole of CD player
base, and press down the worm wheel < A > .

2. Then, turn fully the lock lever in the arrow direction through
the hole on the loading chassis bottom in this state.
After that, push forward the CD player base.

LOCK

< A >

LEVER

Figure 7-4

– 7 –

Front
Panel

( C4 ) x1

SRS PWB

Figure 7-3

CD Player Unit

( C5 ) x1

CD-C290X

( F2 ) x1
ø3 x10mm

( F4 ) x2

( F3 ) x1
ø3 x8mm

( F1 ) x3
ø3 x10mm

( F1 ) x3
ø3 x10mm

( F4 ) x1

Figure 8-1

Switch PWB

( E1 ) x1
ø3 x8mm

( F4 ) x1

Front Panel

Front Panel

Display
PWB

Main PWB

Tuner PWB

( E1 ) x2
ø3 x8mm

( E2 ) x1

( L1 ) x1
ø2 x 4mm

( L2 ) x1

( K2 ) x1

CD Player Unit

( K1 ) x1
ø3 x10mm

Washer

Turntable

Disc Tray

( L1 ) x1
ø2 x 4mm

( L2 ) x1

Figure 8-4

(G2 ) x1

Power PWB

( H1 ) x6
ø3x10mm

( G1 ) x3
ø3x10mm

Figure 8-2

( J1 ) x1
ø3 x10mm

Open

Cassette
Holder

Tape
Mechanism

(G2 ) x1

SRS PWB

( M1 ) x4

ø2.6 x 5mm
( N1 ) x1
ø2.6 x10mm

Shift Lever

CD Changer
Mechanism

CD Player Base

CD Mechanism

Be careful when installing the CD changer mechanism.
Install the CD changer mechanism on the CD player base after
the shift lever has been set in the highest position.

Figure 8-5

Loading Chassis

Figure 8-3

– 8 –

CP-C290X

STEP

REMOVAL PROCEDURE FIGURE

1 Front Speaker 1. Net Frame.............. (A1) x1 9-1

2. Duct Panel ............. (A2) x1

3. Screw ..................... (A3) x4

4. Screw ..................... (A4) x4

Net Frame
( A1 ) x1

CD-C290X

Tweeter

( A3 ) x4
ø4x14mm

Notes:

The Surround speakers can be easily disassembled.Therefore
the disassembling method is not discribed.For details refer to
the disassembling drawing in the Parts Guide.

REMOVING AND REINSTALLING THE MAIN PARTS

CD MECHANISM SECTION

Perform steps 1, 2, 3, 13 and 14 of the disassembly method
to remove the CD mechanism.

How to remove the loading motor
(See Fig. 9-2)

1. Remove the screws (A1) x 2 pcs., to remove the loading
motor.

Duct Panel
( A2 ) x1

Loading / Up
/ Down Motor

Motor
PWB

( A4 ) x4
ø4x14mm

Woofer

Screwdriver

Figure 9-1

How to remove the pickup (See Fig. 9-3)

1. Remove the screws (B1) x 2 pcs., to remove the shaft (B2)
x 1 pc.

2. Remove the stop washer (B3) x 1 pc., to remove the gear
(B4) x 1 pc.

3. Remove the pickup.

( B1 ) x2
ø2.6 x6mm

Shaft
( B2 ) x1

( A1 ) x2
ø2.6 x5mm

Figure 9-2

Stop Washer
( B3 ) x1

Pickup

CD Mechanism
Gear
( B4 ) x1

– 9 –

Figure 9-3

CD-C290X

ADJUSTMENT

MECHANISM SECTION

• Driving Force Check

Torque Meter Specified Value

Play: TW-2412 Tape 1: Over 80 g

Tape 2: Over 80 g

• Torque Check

Torque Meter

Play: TW-2111 30 to 60 g. cm 30 to 60 g.cm
Fast forward: TW-2231 — 60 to 120 g.cm
Rewind: TW-2231 — 60 to 120 g.cm

• Tape Speed

Test Tape

Normal MTT-111 Volume in 3,000 ± Speaker
speed motor. 30 Hz terminal

Adjusting

(MM1) (Load

TAPE MECHANISM

Tape 1

Point

Specified Value

Specified

Value

Tape 2

Instrument

Connection

resistance:
8 ohms)

TUNER SECTION

fL: Low-range frequency
fH: High-renge frequency

• AM IF/RF

Signal generator: 400 Hz, 30%, AM modulated

Test Stage Frequency

IF 450 kHz 1,602 kHz T351 *1

AM Band — 531 kHz (fL): T306 *2
Coverage 1.1 ± 0.1 V

AM 990 kHz 990 kHz (fL): T302 *1
Tracking

*1. Input: Antenna, Output: TP302
*2. Input: Antenna, Output: TP301

• FM
Notes:

1: Description of the "FM IF Adjustment" is not carried on this

Manual. It is because the IF coil in the FM front end section
has been best adjusted in the factory so that its further
adjustment is not needed at the field. When replacing the
FM front end assembly, no adjustment is needed either.

2: The parts in the FM front end section are prepared in a

complete unit, so you can't obtain each part individually

• FM Mute Level

Signal generator: 1 kHz, 40 kHz dev., FM modulated

Frequency

Display

Setting/

Adjusting

Parts

Instrument

Connection

Volume in motor

TP302

R357

AM IF

T351

MM 1
Motor

FM MUTE
LEVEL

VR351

Frequency

98.00 MHz 98.00 MHz VR351* Input: Antenna
(25 dBµV) Output: Speaker

Frequency

Display

Adjusting

Parts

TUNER PWB

R336

T306

TP301

FE301

T302

Instrument

Connection

Terminal

SO301
ANTENNA
TERMINAL

AM BAND
COVERAGE

Figure 10 ADJUSTMENT POINTS

– 10 –

AM
TRACKING

TEST MODE

• Setting the test mode
Any one of test mode can be set by pressing several keys as follows.
<REC. PAUSE> + <DISC SKIP> + <POWER> TEST: CD operation test

• TEST mode
Function — CD test mode

Setting of TEST mode
Indication of CD TST mode (Fig. 11-1)

IL is not performed.

OPEN/CLOSE operation is manual operation.
The pickup can be moved by using the (è) or (È) key.

<MEMORY>
LASER ON

<MEMORY>
Tracking on the spot.
SERVO OFF PLAY

<MEMORY>
Tracking on the spot.
SERVO ON PLAY

CD-C290X

<STOP>

STOP

<PLAY> key input

TOC. IL is performed, and the ordinary PLAY is performed.
If the following key is pressed during PLAY, it is possible

Press <STOP> key. Stop

to specify directly any Track No.
<Disc Number 1> key: Track 4
<Disc Number 2> key: Track 9
<Disc Number 3> key: Track 15

Note:

Only in STOP state it is possible to slide the pickup with the (è) or (È) key.
VOL. --- Last memory

BAL. --- CENTER
R.GEQ. --- FLAT
X-BAS --- OFF

1 2 3

Canceling method - POWER OFF

Figure 11-1

CD SECTION

Since this CD system incorporates the following automatic adjustment function, when the pickup is replaced, it is not necessary
to readjust it.
Since this CD unit does not need adjustment, the combination of PWB and laser pickup unit is not restricted.

• Automatic adjustment item

1. Focus offset (Fig. 11-2)

2. Tracking offset (Fig. 11-3)

3. E/F balance (tracking error balance) (Fig. 11-4)

4. RF level AGC function (HF level: constant)

5. RF level automatic follow-up of the tracking gain
This automatic adjustment is performed each time a disc is changed. Therefore,

each disc is played back using the optimal settings.

0.1s

0.50 V
IC1 20 FE

0.1s

0.50 V
IC1 7 TE

FOCUS
OFF-SET
ADJUST

TRACKING
OFF-SET
ADJUST

1
2

10ms

0.50 V
IC1 20 FE

10ms

0.50 V
IC1 7 TE

Figure 11-2

200 ms
1V/diV
IC 1 15

200 ms
1V/diV
IC 1 7

TO

TE

TRACKING/
ERROR
BARANCE

1

ADJUST

2

Figure 11-4

– 11 –

Figure 11-3

Enlarged
View

TRACKING
OFF-SET
ADJUST

1
2

CD-C290X

FRONT VIEW

NOTES ON SCHEMATIC DIAGRAM

• Resistor:
To differentiate the units of resistors, such symbol as K and
M are used: the symbol K means 1000 ohm and the symbol
M means 1000 kohm and the resistor without any symbol is
ohm-type resistor. Besides, the one with “Fusible” is a fuse
type.

• Capacitor:
To indicate the unit of capacitor, a symbol P is used: this
symbol P means micro-micro-farad and the unit of the
capacitor without such a symbol is microfarad. As to
electrolytic capacitor, the expression “capacitance/withstand
voltage” is used.
(CH), (TH), (RH), (UJ): Temperature compensation
(ML): Mylar type
(P.P.): Polypropylene type

• Schematic diagram and Wiring Side of P.W.Board for this
model are subject to change for improvement without prior
notice.

REF. NO DESCRIPTION POSITION POSITIONREF. NO DESCRIPTION

SW1 OPEN/CLOSE ON—OFF
SW2 MECHA UP ON—OFF
SW3 DISC NUMBER ON—OFF
SW4 PICKUP IN ON—OFF
SW701 3D SURROUND ON—OFF
SW702 VOLUME DOWN ON—OFF
SW703 X-BASS/EQUALIZER ON—OFF
SW704 VOLUME UP ON—OFF
SW705 REC/PAUSE ON—OFF
SW706 FF ON—OFF
SW707 STOP ON—OFF
SW708 PLAY ON—OFF
SW709 REW ON—OFF
SW710 TUNING UP/TIME ON—OFF
SW711 TUNING DOWN/TIME ON—OFF
SW712 ON/STAND-BY ON—OFF
SW713 CLOCK ON—OFF

• The indicated voltage in each section is the one measured
by Digital Multimeter between such a section and the chas­sis with no signal given.

1. In the tuner section,

( ) indicates AM

2. In the main section, a tape is being played back.

3. In the deck section, a tape is being played back.

( ) indicates the record state.

4. In the power section, a tape is being played back.

5. In the CD section, the CD is stopped.

• Parts marked with “ ” ( ) are important for
maintaining the safety of the set. Be sure to replace these
parts with specified ones for maintaining the safety and
performance of the set.

SW714 TIMER/SLEEP ON—OFF
SW715 MEMORY ON—OFF
SW716 CD ON—OFF
SW717 TUNER/BAND ON—OFF
SW718 TAPE 1-2 ON—OFF
SW719 VIDEO/AUX ON—OFF
SW720 DISC 1 ON—OFF
SW721 DISC 2 ON—OFF
SW722 DISC 3 ON—OFF
SW723 DISC SKIP ON—OFF
SW724 OPEN/CLOSE ON—OFF
SW725 SPAN SELECTOR 100/10—50/9
SW901 VOLTAGE SELECTOR 110—127—

SWM 3 FOOL PROOF ON—OFF
SWM 4 F.A.S ON—OFF
SWM 5 CAM ON—OFF

220—230-240

FRONT

VIEW

E

C

(1)

(2)

(3)

(S)

(G)

(D)

KRC102 M
KRC104 M
KRC107 M
KTA1266 GR
KTA1271 Y
KTC3199 GR

B

KTC3203 Y
2SK246 GR

KTA1273 Y

FRONT

VIEW

B

(3)C(2)E(1)

KTC3200 GR

KV1236Z23F

Figure 12 TYPES OF TRANSISTOR AND LED

– 12 –

FRONT

VIEW

333GTH2

1

2

3

4

14

5

98

6

7

17

20

12

13

24

25

30

31

3222

10 11

27

26

28

29

PU-IN SW

XL1

XIN

LDO

FIN2

JP–

CV+

SLC

SLI

FIN1

E

F

TO

FD

SPO

SP

SLD

SL–

SL+

DRF

CL

DAT

CE

VCC1

6

PICKUP IN

SW4

FOCUS COIL

TRACKING COIL

M1

DISC

MOTOR

M

M

M2

SLED

MOTOR

PICKUP UNIT

9

IC2

LC78622K

SERVO/SIGNAL

CONTROL

+B1

IC5

M56748FP

DRIVER

IC1

LA9241M

SERVO AMP.

6

1

9

5

+B1

+B1

+12V

+5V

( TO IC401 )

RES. CQCK. COIN

SQOUT. RWC. WRQ

~

~

~

CL, DAT, SELIAL CONTROL/CE

Q93

Q91

SL+. SL–. DRF

7
3

9

8

7

6

5

4

3

2

1

GND (D)

MECHA UP

GND (D)

DISK NO.

OPEN/CLOSE

GND (D)

M–

M+

GND (M)

SOL

9

8

7

6

5

4

3

2

1

CNP10

M

62

64 56 55 45 3623 43

37

38

39

40

24

25

10 10

265853

10

12

20

32

40

43

44

5352515431302923271615

4144

Q1

TO MAIN SECTION

IC91

TA7291

LODING MOTOR

DRIVER

XOUT

EFMO

EFMIN

CLV+

JP–

CONT2

CONT1

RCHO

RVSS

LVSS

LCHO

VVDD

VDD

LVDD

RVDD

XVDD

SW1

OPEN/CLOSE

SW2

MECHA UP

SW3

DISC No.

M3

LOADING

SOLM2

SOLENOID

TO MAIN(IC601) &

DISPLAY SECTION

CNS10

+B5

CD-C290X

Figure 13 BLOCK DIAGRAM (1/3)

– 13 –

CD-C290X

FM

75 OHMS

AM

SO301

ANTENNA

TERMINAL

8

2

6

AM RF

AM ANT.

FM FRONT END

FE301

3

7

FM

OSC.

T306T302

4

VT

AM OSC.

+B4 CF351 X351

AM IF

T351

3

1

REG INOUT VCC

IC303

LA1832

AM OSC

24

22

23

OUT

IN

AFC

AM IN

22

15 16

OSC.

LC72131

PLL(TUNER)

SRS 1/2

SRS ON/OFF

CN7

+B4

42

98

5

GND

FM IF DET/FM MPX/AM IF

21

AM RF IN

FM IN

IC302

CE

7

STEREO

XT21

11

4398

DI

13

6

SD

MONO/ST

FM MONO/ST

10

5

CL

IF

OUT

VOLTAGE

REGURATER

IF IN

121013

6

Q371

DO

PHASE

11

+B4

17

21

MPX

2

1

20

2917

+5V

Q361

16

18

MPX

FM/AM

IN

OUT

12

14

15

RL
MPX
VCO

MUTING

CUT

Q353
Q354

TUNER MUTE

SD

CNP303

+B4

VF2
(AC)

3

FM MUTE LEVEL

FMOSC

+B4

FM

VR351

FM IF

CF302

FM IF IN

4.5MHz

20

7

X352

1

1

5

FM +B

Q360

TAPE

MOTOR

FOOL PROOF

SWM3

F.A.S

SWM4

CAM

SWM5

PHM1

SOLENOID

SOLM1

TAPE 1

PB HEAD

L-CH

R-CH

TAPE 2
REC/PB

HEAD

L-CH
R-CH

ERASE
HEAD

MM1

TA MOT SW

M

FOOL PROOF

MECHA STOP

+B5

SWITCHING

Q511

~

Q514

REC

P.B

AC BIAS

POP REDUCE

Q515
Q516

SWITCHING

BIAS
OCS

Q571
L501

Q703

T1 RUN

T2 RUN

PLAYBACK&RECORD/

PLAYBACK AMP.

L (T1)

1

24

R (T1)

L (T2)

2

23

R (T2)

3

L NF

4

R NF

6

L REC

9

16

R REC

14

REF

12

+B4

Q584

Q581

Q706

IC501

AN7345K

T1/T2

REC

NOR/
HIGH

SWITCHING

SWITCHING

P.B.

H/N

T1/T2

1915

Q583

Q582

TA SOL

L

R

13

L

4

21

R

5

20

L

7

18

R

8

L NF

17

R NF
ALC

10

SWITCHING

REC

+B4

+B4

Q566

SO401

AUX IN

VIDEO

TAPE

TUNER

FROM CD SECTION

P.B

Q575
Q576

MUTING

BIAS
Q565

REC/P.B.

REC MUTE

T1/T2

TO CD SECTION

BIAS

CD

+

+B4

+

+B5

+

+B6

(

TO

Figure 14 BLOCK DIAGRAM (2/3)

– 14 –

CD-C290X

I

FL701

3~

–VP

Q701

VF1
(AC)

+B7+B8

3330 31 32

+B8

TAPE BIAS

9

8

7

6

~

1

80
79
77

~

72
71
70

~

65
64

~

61

SYSTEM CONTROL

MICROCOMPUTER

60

57

TAPE MECHA STOP

MEMORY
BACK UP

CD DSP RWC

CD DSP WRQ

T1/T2

TAPE REC

IX0191AW

TAPE F.P.

T1 RUN PLSE

+B3

CD DSP SQOUT

CD DSP COIN

CD DSP CQCK

16151413121110

IC701

VDD

TAPE SOL

TAPE MOTOR

+B8

CD DSP RES

RESET

CD T/T OPEN/CLOSE

L-CH INPUT

T2 RRUN PLSE

CD UP DOWN/DISC NO

R-CH INPUT

2423222120191817

25

~

27
29

VDD

30
33
34
35
36
37
38
39
40

42 4143444546474849505152535455565859

TUN SD

POWER

CD SL–

CD SL+

CD PUIN

RX701

1

3
REMOTE
SENSOR

2

CL
CE
DI
DO
DRF

AVDD
AVREF

+B7

+B8

+B7

XL702

4.19MHz

SYSTEM STOP

RESET

RESET

Q702

KEY

SW701
SW719

~

TO CD SECTION

TO CD SECTION
TO CD SECTION

TO POWER SECTION

SW720

~

SW724

TO CD SECTION

Q704
Q705

ZD701

TO CD SECTION

Q810
Q811
Q812

+B4

CLDICE

23

24 25 57

L

16

VIDEO

33

R

TAPE

L

17
32

R

TUNER

L

19
30

R

CD

L

21
28

R

+12V (AUDIO)

+B4

+12V (DRIVER)

ON

+B5

+12V

+B6

(MECHA)

TO CD SECTION

VDD

AUDIO PROCESSOR

VREF

LVREF

VOLTAGE

REGULATOR

+B1

+B2

+B3

Q941

+5V
(UCOM)

+5V

+5V

RVREF

14 35 56 63 50 26

LC75394E

GRAPHIC EQUALIZER

VSS

AVSS

27123711381039

45

4

IC401

Q201

Q206

Q205

VOLTAGE

REGULATOR

IC941

VOLTAGE

REGULATOR

IC942

42

5

7

1

VCC

26

MODE

8

44

41

6

X-BASS

IC201

SRS5250S

SRS

F941
T500mA L 250V

VF1
–VP
VF2

43

9

VOLUME

133614

40

R/L OUT

35

781817

15192425 1011 23

R/L IN

ZD901

OUT

58
55

L
R

Q901

VOLTAGE

REGULATOR

D901 ~ D904

D905 ~ D908

13

L-IN
R-IN

9
7

VCC

14

NF

8

D909
D911

11

4

3

~

12

MUTE

IC961

LA4450

POWER AMP.

F901

T3.15A L 250V

F902

T1.6A L 250V

LED810

~

LED815

L-OUT
2
5

R-OUT

TF901

PT901

POWER TRANSFORMER

SO961

SPEAKER TERMINAL

220V

110V

230V-240V

127V

SW901
VOLTAGE
SELECTOR

SO901

AC 110/127/220/

230-240V 50/60Hz

JA961
HEADPHONES

+

–

SPEAKERS
MIN. 4 OHMS

–

+

AC POWER

SUPPLY CORD

Figure 15 BLOCK DIAGRAM (3/3)

– 15 –

CD-C290X

PLAY

TCD-712

5s
100mV
SLD

1

1

2

5ms

0.50 V
IC1 20 F.E

5ms

5.0 V
IC1 54 DRF

WAVEFORMS OF CD CIRCUIT

STOP PLAY

FOCUS SERCH

0.5ms

6

10.0 V
JP+

0.5ms

7

10.0 V
JP-

0.5ms

8

0.50 V

3
1

JP

0.5ms

9

1.00 V
TE

0.5ms

3

1.00 V
HF

0.5ms

4

5.0 V
HFL

0.5ms

5

5.0 V
TES

0.5ms

1.00 V

3

HF

0.5ms

4

5.0 V
HFL

0.5ms

5

5.0 V
TES

50ms

6

10.0 V
JP+

50ms

7

10.0 V
JP-

50ms

8

0.50 V
JP

50ms

9

1.00 V
TE

CUE

1
2

3

REVIEW

1
2

3

CUE

10

11

10

11

12

20ms

1.00 V
SPO

20ms

2.00 V
CLV+

50ms

1.00 V
SPO

50ms

2.00 V
CLV+

PLAY

NORMAL DISC
TN0=01

PLAY

TCD-712 (140mm)
TN0=01

0.5ms

10.0 V

6

JP+

0.5ms

10.0 V

7

JP-

0.5ms

0.50 V

8

JP

0.5ms

9

1.00 V
TE

50ms

10.0 V

6

JP+
50ms

10.0 V

7

JP­50ms

8

0.50 V
JP

50ms

9

1.00 V
TE

REVIEW

12

0.5s
100mV
SLD

1

– 16 –

CD-C290X

A

B

C

D

E

F

G

H

TO MAIN PWB

P18 4-A

TO MAIN PWB

P19 7-A

TO MAIN PWB

P19 10-A

FW702

FW702

FW702

DISPLAY PWB-A2

9

CNS704

1

R723

SW701
3D
SURROUND

R806

SW706

FF/PRESET

SW708

PLAY

11

SW707
STOP

SW709
REW/
PRESET

11

CNS702

1

TIMER/SLEEP

CNS703

1

SW714

REC PAUSE

R722

R804

R744

SW705

DEMO

R721

R743

SW713
CLOCK

C717

R720

R745

D706

R719

SW715

MEMORY

C716

SW702

VOLUME DOWN

R787

R801
R802

R799

Q705

D702

ZD701

R740

R764

R760

E
C
B

D708

D701

C719

R786

BCE

R784

R717
R715

R730
R731
R727

R728
R729

R733
R734

R736

R763

R795
R793

Q703

R750
R751
R752
R753

R762

R785

C708

R765

Q704

BCE

D704

L701

R726

R735

24
25

C707

R782

RX701

123

R797

C714

C701

R724

R725

15

20

30

35

XL701

R779

C712

R813

E
C
B

Q706

SW719

VIDEO/AUX

R798R800

Q702
R781

R780

R732

10

IC701

40

R778

R803

R710

SW710
TUNING UP
/TIME

SW711
TUNING DOWN
/TIME

/SET

D707

D703

R716

R718

R702

R742

R741

R739

C713

R796

R783

R805

CNS705

18

1
2
3

C702

41

R777

R814

1

5

45

R776

R771

R749

R711

C720

C718

80

75

70

55

50

R774

R775

R769

R770

R790

ON/STAND-BY

SW718

TAPE

(1 2)

SW703

X-BASS

EQUALIZER

C711

D705

321

Q701

65

64

60

C715

R773

R766

R768

R767

R789

R791

SW712

R748

R707

R788

R746

SW717
TUNER
(BAND)

R712

R808
R809

SW704

VOLUME UP

C709

C710

33
32
31
30
29
28
27
26
25
24
23
22
21

20
19
18
17
16

FL701

15
14
13
12
11
10

9
8
7
6
5
4
3

2
1

R807

CNS701

R747

SW716

CD

SWITCH PWB-A3

SW724

OPEN/CLOSE

R761

R759

SW723

DISC SKIP

R758

123

Q812

R812

LED814

SW722
DISC 3

LED815

R757

1
2

Q811

3

R811

LED812

LED813

SW721
DISC 2

123

Q810

R756

R810

LED810

DISC 1

6

12
11
10

CNS701

9
8
7
6
5
4
3
2
1

CNSM1

LED811

1

CNPM1

P20 5-D

TO TAPE MECHANISM PWB

SW720

6

1

MELF

WH

GY

WH

GY

WH

GY

WH

RD

1

23456

Figure 17 WIRING SIDE OF P.W.BOARD (1/6)

– 17 –