Sharp CDC-290-X Service manual

CD-C290X

SERVICE MANUAL

No. S9910CDC290X

CD-C290X

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

●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 RetrievalSystem 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
	Page
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

SHARP CORPORATION	This document has been published to be used
	for after sales service only.
– 1 –	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 –

CD-C290X

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

SPECIFICATIONS

General

Power source:	AC 110/127/220/230-240 V,
Power consumption:	50/60 Hz
	47 W
Dimensions:	Width; 270 mm (10-5/8")
	Height; 303 mm (11-13/16")
Weight:	Depth; 341 mm (13-7/16")
	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)
Output terminals:	(0.9 % T.H.D.)
	Speakers; 4 ohms
	Headphones; 16-50 ohms
Input terminals:	(recommended; 32 ohms)
	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/
Wow and flutter:		playback)
	0.15 % (WRMS)

Compact disc player section

Type:	3-disc multi-play compact disc player
Signal readout:	Non-contact, 3-beam semi-
D/A converter:	conductor laser pickup
	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
Rated input power:	(2") tweeter]
	20	W
Maximum input power: 40		W
Impedance:	4 ohms
Dimensions:	Width; 180 mm (7-1/8")
	Height; 300 mm (11-13/16")
Weight:	Depth; 204 mm (8-1/16")
	2.1 kg (4.6 lbs.)/each

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

– 3 –

CD-C290X

NAMES OF PARTS

CD-C290X

Front panel

1.Disc Tray

2.Disc Number Select Buttons

3.Disc Skip Button

4.Open/Close Button:

5.Disc Number Indicator

6.Timer Indicator

7.Record Indicator

8.Sleep Indicator

9.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: (TUNER) Preset Down Button:

26.Stop Button:

27.Play/Repeat Button:

28.(CD) Track Up/Cue Button: (TUNER) Preset Up Button:

29.3D Surround Mode Button

30.Tuning and Time Up/Down Buttons:

31.Headphone Socket

32.(TAPE 1) Cassette Compartment

33.(TAPE 2) Cassette Compartment

				1	2	3	4
	5		6 7	8	9
1	2	3	REC SLEEP		X-BASS
					13		10 1112
					14		MEMORY ST
							SRS ( )
					15		kHz
							MHz
							16
			17 18		19	20	21
22
23							30
							31
		24 25 26			27 28 29
				32	33

– 4 –

Rear panel

1.Span Selector Switch

2.Speaker Terminals

3.AC Voltage Selector

4.AC Power Input Socket

5.Video/Auxiliary (Audio Signal) Input Sockets

6.FM 75 Ohms Aerial Terminal

7.Aerial Earth Terminal

8.AM Aerial Terminal

CP-C290

Speaker section

9.Tweeter

10.Woofer

11.Bass Reflex Duct

12.Speaker Wire

Remote control

1. Remote Control Transmitter LED

CD control section

2.Disc Number Select Buttons

3.Track Down/Review Button: /

4.Track Up/Cue Button: /

5.Disc Skip Button

6.Play/Repeat Button:

7.Stop Button:

8.Memory Button

9.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: /

CD-C290X

	1	5
	2	6
		7
	3
		8
	4

9

10

11

12

1

2		5
3		6
4		7
8	9 10	11
13	12
		16
14		17
15		18
19
21		20
22
		23

– 5 –

CD-C290X

Notesconcerninguse: Replacethebatteriesiftheoperatingdistancebecomesreducedorifoperationbecomeserratic.

PeriodicallycleanthetransmitterLEDontheremotecontrol andthesensoronthemainunitwithasoftcloth.

Exposing the sensor on the main unit to strong lightmay interferewithoperation.Changethelightingorthedirection oftheunit.

Keeptheremotecontrolawayfrommoisture,excessiveheat, shock,andvibrations.

		15
PREPARTIONFORUSE		15
	0.2m-6m	(8"-20')

OPERATION MANUAL

Resetthemicrocomputerunderthefollowingconditions: Toeraseallofthestoredmemorycontents(clockandtimer settings,andtunerandCDpresets).

Ifthedisplayisnotcorrect.

Iftheoperationisnotcorrect.

1PresstheON/STAND-BYbuttontoenterthestand-bymode.

2WhilepressingdowntheVOLUMEbuttonandthe button,holddowntheON/STAND-BYbuttonforatleast 1second.

Caution: Theoperationexplainedabovewillerasealldatastoredin memoryincludingclockandtimersettings,andtunerandCD presets.

MICROCOMPUTER	2	2
RESETTINGTHE	1,2

SETTING THE CLOCK

stand-bymode.		button.
theON/STAND-BYbuttontoenterthe	theCLOCKbutton.	5seconds,presstheMEMORY/SET
Press	Press	Within
1 2		3
(Mainunitoperation)	Inthisexample,theclockissetforthe	24-hour(0:00)system.

4PresstheTUNING/TIME(or)buttontoselectthetime displaymode.

"AM12:00" The12-hourdisplaywillappear. (AM12:00-PM11:59)

"AM0:00" The12-hourdisplaywillappear.

(AM0:00-PM11:59) "0:00" The24-hourdisplaywillappear.

(0:00-23:59) Notethatthiscanonlybesetwhentheunitisfirstinstalled orithasbeenreset(seepage17).

5PresstheMEMORY/SETbutton.

6PresstheTUNING/TIME(or)buttontoadjustthehour.

PresstheTUNING/TIME( or )buttononcetoadvance thetimeby1hour.Holditdowntoadvancecontinuously.

Whenthe12-hourdisplayisselected,"AM"willchangeauto- maticallyto"PM".

7PresstheMEMORY/SETbutton.

8PresstheTUNING/TIME(or)buttontoadjustthe minutes.

PresstheTUNING/TIME( or )buttononcetoadvance thetimeby1minute.Holditdowntochangethetimein5 minuteintervals.

Thehoursettingwillnotadvanceevenifminutesadvance from"59"to"00".

9PresstheMEMORY/SETbutton.

Theclockstartsoperatingfrom"0"seconds.(Secondsare notdisplayed.)

Note: IntheeventofapowerfailureorwhentheACpowerlead

isdisconnected,theclockdisplaywillgoout. WhentheACpowersupplyisrestored,theclockdisplaywill flashonandofftoindicatethetimewhenthepowerfailure occurredorwhentheACpowerleadwasdisconnected.

If this happens, follow the procedure below to changethe clocktime.

Tochangetheclocktime:

Whentheunitisinthestand-bymode:

PresstheMEMORY/SETbutton.

Performsteps6-9above.

Whentheunitison:

PresstheCLOCKbutton.

Within5seconds,presstheMEMORY/SETbutton.

Performsteps6-9above.

TUNING/

TIME

( )

0:00

AM0:00

ON/

STAND-BY

MEMORY/

SET

CLOCK

2

3

4

AM12:00

5

6

7

8

9

To see the time display:

Press the CLOCK button. ● The time display will appear for about 5 seconds.

To change the time display mode:

MICRO-
2inthesection"RESETTINGTHE	page17.	9above.
1- on		1-
Performsteps	COMPUTER",	Performsteps

– 6 –

CD-C290X

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
			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
4	Back Board	1. Screw ....................		(D1) x6	7-2
5	Tuner PWB	1. Screw ....................		(E1) x3	8-1
		2.	Socket ...................	(E2) x1
6	Switch PWB/	1.	Screw ....................	(F1) x6	8-1.2
	Display PWB/	2. Screw ....................		(F2) x1
		3.	Screw ....................	(F3) x1
	Main PWB/	4. Socket ...................		(F4) x4
7	Front Panel	1.	Screw ....................	(G1) x3	8-2
		2.	Hook ......................	(G2) x2
8	Tape Mechanism	1.	Open the cassette holder.		8-2
		2.	Screw ....................	(H1) x6
9	SRS PWB	1.Screw .....................		(J1) x1	8-3
10	Turntable	1. Screw ....................		(K1) x1	8-4
		2.	Cover ....................	(K2) x1
11	Disc Tray	1.	Screw ....................	(L1) x2	8-4
		2.	Guide ....................	(L2) x2
12	CD Changer	1. Screw ....................		(M1) x4	8-5
	Mechanism
13	CD Mechanism	1. Screw ....................		(N1) x1	8-5

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.

< A >	LOCK
	LEVER

CD-C290X

	Top Cabinet
	( A1 ) x2
	ø 3 x12mm
		( A1 ) x2
	( B1 ) x1	ø 3 x12mm
	ø 3 x10mm
	Side Panel
	(Right)
	( B2 ) x2	Side Panel
	ø 3 x12mm
		(Left)
	Back Board
	( B1 ) x1
	( B2 ) x2
	ø 3 x10mm
	ø 3 x12mm
	Figure 7-1
	CD Tray Cover	Hook
	(C2) x1
		( C1) x3
	Pull
	1
	A	1
	CD Player Unit	2

( C2 ) x1

Back Board

Front Panel

( C3 ) x4

( D1 ) x6
ø 3 x8mm	Main PWB
	Figure 7-2
	SRS PWB	CD Player Unit

Front

Panel

( C4 ) x1

( C5 ) x1

Figure 7-3

Figure 7-4

– 7 –

CD-C290X

( F1 ) x3	( K1 ) x1
ø 3 x10mm	ø 3 x10mm
	Switch PWB

	( F1 ) x3	Front Panel	( K2 ) x1
			Washer
	ø 3 x10mm
( F2 ) x1
ø 3 x10mm		Display	Turntable
		PWB

	Main PWB
	( E2 ) x1
( F4 ) x2	Tuner PWB
	( E1 ) x2
( F3 ) x1	ø 3 x8mm
ø 3 x8mm

	( E1 ) x1
( F4 ) x1	ø 3 x8mm

Figure 8-1

( F4 ) x1

Front Panel

( H1 ) x6

(G2 ) x1 ø 3x10mm

Open

Cassette

Holder

Tape

Mechanism

Power PWB

( G1 ) x3

(G2 ) x1

ø 3x10mm

Figure 8-2

( J1 ) x1

ø 3 x10mm

Disc Tray

( L1 ) x1

ø 2 x 4mm

( L2 ) x1

( L1 ) x1 ø 2 x 4mm

CD Player Unit	( L2 ) x1

Figure 8-4

( M1 ) x4

ø 2.6 x 5mm

( N1 ) x1

ø 2.6 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

SRS PWB

Loading Chassis

Figure 8-3

– 8 –

CD-C290X

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

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.

Tweeter

Net Frame

( A1 ) x1 ( A3 ) x4 ø 4x14mm

( A4 ) x4 ø 4x14mm

Woofer

Screwdriver Duct Panel

( A2 ) x1

Figure 9-1

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.

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.

Loading / Up

/ Down Motor

Motor

PWB

( A1 ) x2 ø 2.6 x5mm

Figure 9-2

( B1 ) x2	Stop Washer
ø 2.6 x6mm ( B3 ) x1

Pickup

	Shaft	CD Mechanism
		Gear
	( B2 ) x1
		( B4 ) x1
		Figure 9-3

– 9 –

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			Specified Value
				Tape 1					Tape 2
	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		Adjusting		Specified				Instrument
				Point			Value			Connection
	Normal	MTT-111		Volume in	3,000 ±					Speaker
	speed			motor.		30 Hz				terminal
				(MM1)						(Load
										resistance:
										8 ohms)
			TAPE MECHANISM

MM 1

Motor

Volume in motor

	FM MUTE
AM IF	LEVEL

VR351

T306

T351

TP302

R357

TUNER SECTION

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

• AM IF/RF

Signal generator: 400 Hz, 30%, AM modulated

Test Stage	Frequency		Frequency	Setting/	Instrument
			Display	Adjusting	Connection
				Parts
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	Frequency	Adjusting	Instrument
	Display	Parts	Connection
98.00 MHz	98.00 MHz	VR351*	Input: Antenna
(25 dBµV)			Output: Speaker
			Terminal

TUNER PWB

R336 TP301

FE301

SO301

ANTENNA

TERMINAL

T302

AM BAND	AM
COVERAGE	TRACKING

Figure 10 ADJUSTMENT POINTS

– 10 –

CD-C290X

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)

	OPEN/CLOSE operation is manual operation.							IL is not performed.
The pickup can be moved by using the (è) or (È) key.
		<MEMORY>		<MEMORY>		<MEMORY>				<STOP>
		LASER ON		Tracking on the spot.		Tracking on the spot.				STOP
				SERVO OFF PLAY		SERVO ON PLAY

<PLAY> key input TOC. IL is performed, and the ordinary PLAY is performed. Press <STOP> key. Stop If the following key is pressed during PLAY, it is possible

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

Canceling method - POWER OFF

1 2 3

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

FOCUS

OFF-SET

ADJUST

0.1s

0.50 V

IC1 7 TE TRACKING OFF-SET

1 ADJUST

		2
		Figure 11-2
	200 ms	TRACKING/
	1V/diV	ERROR
	IC 1 15	BARANCE
	TO	1 ADJUST
	200 ms
	1V/diV
	IC 1 7	2
	TE
		Figure 11-4

10ms 0.50 V

IC1 20 FE

10ms 0.50 V IC1 7 TE

Figure 11-3

Enlarged

View

TRACKING

OFF-SET 1 ADJUST

2

– 11 –

CD-C290X

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
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

KRC102 M

KTA1273 Y

FRONT

KRC104 M

FRONT

KTC3200 GR

VIEW

KRC107 M

VIEW

KTA1266 GR

KTA1271 Y

KTC3199 GR

E C B

KTC3203 Y

B C E

(1)(2)(3)

(3)(2)(1)

(S)(G)(D)

2SK246 GR

•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.

REF. NO	DESCRIPTION	POSITION
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—
		220— 230-240
SWM 3	FOOL PROOF	ON— OFF
SWM 4	F.A.S	ON— OFF
SWM 5	CAM	ON— OFF

FRONT VIEW
	FRONT
	VIEW
KV1236Z23F	333GTH2

Figure 12 TYPES OF TRANSISTOR AND LED

– 12 –

+B1

XL1

Q1

PICKUP UNIT

3623 4341

6

44

45

62 64 56 55

XVDD RVDD LVDD VDD VVDD

XOUT

XIN

LDO VCC1

MAINSECTION	(TOIC401)
TO	+B1
	+5V
	6	5
	IC91 TA7291	LODINGMOTOR DRIVER	3 7
	1	9

37LCHO	38LVSS RVSS39 40RCHO
	IC2 LC78622K
	EFMO
	9

	32
	JP–
IC1	LA9241M

SERVO/SIGNAL		CONTROL	CONT124
EFMIN10	CLV+12	~	20JP–

~	40	43	44
	CV+	SLC	SLI
FIN2	SERVOAMP.FIN1	E	F
1 2 3 4

FOCUSCOIL

TRACKINGCOIL

25CONT2

RES.SQOUT. COINCQCK. WRQRWC.

CE DAT CL

DRF SL+ –SL

SLD SP SPO FD TO

26

58 ~53

15 16 27 23 29 30 31 54 51 52 53

CD-C290X

MECHA UP

SW2

10	9
GND(D)	MECHAUP
10	9

	+B5
	+12V
Q93	Q91

CL,DAT,SELIALCONTROL/CE	SL–.DRF
	SL+.

MOTOR

DISC

M1

SW3 DISCNo. SW1	OPEN/CLOSE	M3 LOADING	SOLM2 SOLENOID
		M
8 7 6	5 4 3 2 1
GND(D) DISKNO. OPEN/CLOSE	GND(D)	M– M+ GND(M)	SOL
8 7 6	5 4 3 2 1

+B1
17	20		26	27	28
5223214		IC5	M56748FP	DRIVER
6 7		12	13	24	25

CNS10

CNP10

29

1110 98

30

31

TO MAIN(IC601) & DISPLAY SECTION

PU-IN SW

M

M2 SLED MOTOR

M

PICKUPIN SW4

Figure 13 BLOCK DIAGRAM (1/3)

– 13 –

CD-C290X

SO301	+B4	CF351	X351
ANTENNA
TERMINAL	FM IF

FM

8

FM FRONT END

1

CF302

AM IF

FE301

+B4

75 OHMS

FM IF IN

T351

5

AM

2 6 7

3

4

1

2

3

4

5

8

9

FM OSC.

VT

17

29

20

18

16

OUT

REG

IN

GND

VCC

FM/AM

MPX

IC303

OUT

IN

VR351

FM IF DET/FM MPX/AM IF

FM MUTE LEVEL

LA1832

IF

AM OSC

OUT

24

23

22

21

7

13

6

10

11

12

14 15

OUT

IN

AFC

INRFAM

STEREO

MONO/ST

SD

MPX

L R

FMOSC

VCO

MUTING

CUT

Q353

Q354

AM RF

TUNER MUTE

AM ANT.

AM OSC.

SD

T302

T306

VOLTAGE

INAM

INFM

XT21

MONO/STFM

REGURATER

INIF

+B4

X352

4.5MHz

+B

+B4

20

1

22

15

16

11

10

13

12

+5V

17

FM

FM 7

OSC.

IC302

Q360

LC72131

PLL(TUNER)

8

9

3

4

5

6

21

ON/OFF

SRS1/2

CE

DI

CL

Q371

SRS

DO

MPX

Q361

PHASE

+B4

CN7

MM1
TAPE
MOTOR	TA MOT SW
	Q703

M

FOOL PROOF		FOOL PROOF
SWM3		T1 RUN
F.A.S
SWM4
CAM		MECHA STOP
SWM5
PHM1	+B5	T2 RUN
SOLENOID				Q706	TA SOL
SOLM1
		PLAYBACK&RECORD/
		PLAYBACK AMP.
				IC501
TAPE 1				AN7345K
PB HEAD		L (T1) 1				13		+B4
L-CH					P.B.
	SWITCHING	R (T1) 24						P.B
R-CH	Q511	L (T2) 2			L	4	L
					R 21 R
TAPE 2	~	R (T2) 23
	Q514
REC/PB		L NF 3				5
	REC
HEAD	P.B	R NF 4				20
L-CH		POP REDUCE	6	T1/T2	H/N	7 L		REC	Q575	REC MUTE
R-CH
		L REC 9		REC		18 R			Q576
		R REC 16				8	L NF		MUTING
						17	R NF
	AC BIAS	REF 14		NOR/		10	ALC
					T1/T2
			12	HIGH
				15	19
		+B4								T1/T2
		Q584			SWITCHING
		Q515			Q583
		Q516
	SWITCHING									REC/P.B.
		Q581			Q582
	BIAS			SWITCHING				+B4
									BIAS
	OCS
		Q571						Q566	Q565	BIAS
ERASE		L501
HEAD							SWITCHING

1

2

3

VF2

(AC)

CNP303

SO401

AUX IN

VIDEO

TAPE

TUNER

CD

FROM CD SECTION

+

+B4

+

TO CD SECTION +B5

+B6

+

(

TO

Figure 14 BLOCK DIAGRAM (2/3)

– 14 –

CD-C290X

FL701

3 ~ 30	31 32	33
–VP	Q701	VF1
		(AC)

6 ~ 1

80

79

77 ~ 72 71

70 ~ 65

64 ~ 61

+B8 +B7

+B3

MEMORY

BACK UP

		TAPEBIAS		TAPEREC T1/T2 DSPCD WRQ DSPCD RWC				DSPCD CQCK DSPCD COIN DSPCD SQOUT			RESET DSPCD RES		T/TCDOPEN/CLOSE			UPCDDOWN/DISC NO	RRUNT2 PLSE	CH-LINPUT	CH-RINPUT
	+B8
	7	8	9	10	11	12	13	14	15	16	17	18	19	20		21	22	23	24
																				25
																				~
																				27	AVDD
								IC701											VDD 29				+B8
																					AVREF
																				30			+B7
						IX0191AW
																				33
			SYSTEM CONTROL																	34		XL702
																				35	CL	4.19MHz
				MICROCOMPUTER																36
																				37	CE
																				38	DI
																				39	DO
																				40	DRF
60	59	58	57	56	55	54	53	52	51	50	49		48	47	46	45	44	43	42	41
			STOPMECHATAPE	PLSERUNT1 F.P.TAPE			VDD MOTORTAPE SOLTAPE								SDTUN POWER SL–CD SL+CD PUINCD								RESET
																							SYSTEM STOP
							+B8
																1	RX701			3	+B7
																	REMOTE
																	SENSOR
																		2

TO CD SECTION

TO CD SECTION

TO CD SECTION

TO POWER SECTION

	KEY	SW720
	SW701	~
	~	SW724
	SW719

TO CD SECTION

RESET

Q702

Q704

Q705

ZD701

TO CD SECTION

											+B4
	CL	DI	CE									5			8				9
	23	24	25	57				4	45	7	42			44		41	6	43		40
VIDEO	L 16			VDD
																					OUT
	R 33							IC401
																	VOLUME				58	L
TAPE	L 17						LC75394E														55	R
	R 32					AUDIO PROCESSOR
TUNER	L 19
	R 30							GRAPHIC EQUALIZER
				VREF	LVREF	RVREF	VSS AVSS
CD	L 21
	R 28
		14	35	56	63	50	26 27	12	37		11	38		10	39			13	36	14	35
															X-BASS
																			R/L OUT		R/L IN
								Q201
																		17	18	8	7
											1	VCC				IC201
															SRS5250S
								Q206			26	MODE					SRS
												25	24		11	10	3	2		19	15

			Q205
	+12V	(AUDIO)
	+B4
			VOLTAGE
			REGULATOR
ION	+12V	(DRIVER)	IC941
	+B5	Q941

+12V	VOLTAGE		ZD901
	REGULATOR
+B6			F941
(MECHA)
TO CD SECTION	+5V	VOLTAGE	T500mA L 250V
	+B1	REGULATOR
	(UCOM)
	+5V	IC942
	+B2		VF1
	+5V		–VP
	+B3		VF2

Q810	LED810
Q811	~
Q812	LED815

13	L-IN		12
9 R-IN			MUTE	L-OUT
7 VCC				2		JA961
				5		HEADPHONES
14				R-OUT
	NF			IC961
8		4 11			SO961
	3			LA4450	SPEAKER TERMINAL
			POWER AMP.		+
					– SPEAKERS
					–	MIN. 4 OHMS
					+

D901 ~ D904	F901
	T3.15A L 250V

	D905 ~ D908
				240V
		~		110V 127V 220V 230V-
	Q901	D909
		D911	F902	SW901
				VOLTAGE
			T1.6A L 250V
	VOLTAGE			SELECTOR
			TF901
	REGULATOR			AC POWER
				SO901 SUPPLY CORD
				AC 110/127/220/
				230-240V 50/60Hz
			PT901
			POWER TRANSFORMER

Figure 15 BLOCK DIAGRAM (3/3)

– 15 –

CD-C290X

WAVEFORMS OF CD CIRCUIT

STOP PLAY

FOCUS SERCH

1	5ms		6	0.5ms
	0.50 V
		F.E		10.0 V
	IC1 20			JP+
			7	0.5ms
				10.0 V
				JP-
2	5ms		8	0.5ms
	5.0 V
		DRF		0.50 V
	IC1 54			JP
		3
		1	9	0.5ms
				1.00 V
				TE
3	0.5ms		CUE
	1.00 V
	HF
			10	20ms
				1.00 V
4	0.5ms	1		SPO
	5.0 V	2
	HFL
5			11	20ms
	0.5ms	3		2.00 V
	5.0 V			CLV+
	TES
3	0.5ms		REVIEW
	1.00 V
	HF
4	0.5ms	1		50ms
	5.0 V		10
	HFL	2		1.00 V
				SPO
5	0.5ms	3
	5.0 V
	TES		11	50ms
				2.00 V
				CLV+
6	50ms		CUE
	10.0 V
	JP+
7	50ms
	10.0 V
	JP-
8	50ms
	0.50 V
	JP
9	50ms		12	5s
				100mV
	1.00 V
	TE			SLD
6	0.5ms
	10.0 V
	JP+
7	0.5ms
	10.0 V
	JP-
8	0.5ms
	0.50 V
	JP
9	0.5ms		12	0.5s
				100mV
	1.00 V
	TE			SLD
6	50ms		REVIEW
	10.0 V
	JP+
7	50ms
	10.0 V
	JP-
8	50ms
	0.50 V
	JP
9	50ms
	1.00 V
	TE
			– 16 –

PLAY

NORMAL DISC

TN0=01

PLAY

TCD-712 (140mm)

TN0=01

PLAY

TCD-712

1

1

CD-C290X

A

R711

R712

DISPLAY PWB-A2

SWITCH PWB-A3

SW702

SW704

VOLUME DOWN

VOLUME UP

FW702

9

SW703

X-BASS

EQUALIZER

TO MAIN PWB

CNS704

R710

D703

D702

D701

R785

P18 4-A

R782

SW724

B

SW710

OPEN/CLOSE

1

R723

R787

TUNING UP

C720

/TIME

R814

RX701

R801

C719

SW701

1

C711

R761

2

3D

R802

R759

SURROUND

3

D705

C709

ZD701

C718

SW711

R800

R798

TUNING DOWN

Q704

3

2 1

/TIME

C710

SW723

R799

R786

B

C

E

1

2

3

Q701

DISC SKIP

Q705

B

C

E

R797

Q702

R707

R781

R806

R784

D704

L701

33

C

SW705

R780

32

REC PAUSE

C702

R758

DEMO

31

SW706

R716

C714

30

3

2

1

FF/PRESET

R722

R721

R720

R719

R717

29

Q812

C701

28

R715

R812

R702

27

R718

R730

26

SW708

R731

R726

R725

R724

R732

25

PLAY

R727

FW702

11

24

23

R728

22

R729

SW722

LED814

21

CNS703

DISC 3

TO MAIN PWB

R733

20

D

1

80

19

LED815

P19 7-A

R734

18

R735

5

FL701

17

R736

75

16

R757

10

1

1

70

15

Q811

15

65

2

R804

14

R742

24

20

IC701

64

13

R811

3

R750

60

R741

12

LED812

R740

R751

25

55

30

11

R752

50

35

10

R753

45

R739

9

LED813

8

C713

XL701 40

41

SW721

7

C708

C707

DISC 2

R796

R764

R760

C715

6

3

2

1

5

E

Q810

SW707

4

R810

STOP

R763

3

R756

R743

R765

2

LED810

SW709

SW715

R778

R777

R771 R776

R775

R774

R773

1

REW/

MEMORY

R762

PRESET

R744

/SET

R779

SW720

LED811

R770

R769

R768

R767

R766

DISC 1

R745

R807

6

R795

CNS701

R808

R793

R809

SW714

C712

TIMER/SLEEP

F

R790

R791

R789

1

CNS701

R788

FW702

11

6

1

SW713

SW712

CLOCK

ON/STAND-BY

TO MAIN PWB

CNS702

E

P19 10-A

Q703

R813

C

D706

D707

R805

R783

B

C717

E

C

1

C716

B

R803

R746

G

Q706

D708

MELF

CNS705

WH

12

CNPM1 MECHANISM PWB

1

8

SW719

SW718

SW717

SW716

GY

11

WH

10

VIDEO/AUX

TAPE

TUNER

CD

R749

(1

2)

R748

(BAND)

R747

GY

9

P20 5-D

8

WH

7

6

GY

5

TAPE

4

3

WH

TO

H

2

RD

1

CNSM1

1

2

3

4

5

6

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

– 17 –