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QT-CD250

CONTENTS Page

IMPORTANT SERVICE NOTEST (FOR U.S.A. ONLY) .................................................................................................... 2

SPECIFICATIONS ............................................................................................................................................................. 2

NAMES OF PARTS ........................................................................................................................................................... 3

OPERATION MANUAL ...................................................................................................................................................... 4

DISASSEMBLY.................................................................................................................................................................. 5

REMOVING AND REINSTALLING THE MAIN PARTS..................................................................................................... 5

ADJUSTMENT ................................................................................................................................................................... 7

NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 11

TYPES OF TRANSISTOR ............................................................................................................................................... 11

SCHEMATIC DIAGRAM .................................................................................................................................................. 12

WIRING SIDE OF P.W.BOARD....................................................................................................................................... 14

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

TROUBLESHOOTING (CD SECTION) ........................................................................................................................... 17

FUNCTION TABLE OF IC................................................................................................................................................ 21

PARTS GUIDE/EXPLODED VIEW

PACKING OF THE SET (FOR U.S.A. ONLY)

• In the interests of user-safety the set should be restored to its

originalconditionandonlypartsidenticaltothosespecifiedshould

be used.

QT-CD250

SERVICEMANUAL

SHARP CORPORATION

No. S2014QTCD250/

This document has been published to be used

for after sales service only.

The contents are subject to change without notice.

QT-CD250

– 2 –

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

TO THE OPERATION MANUAL.

BEFORE RETURNING THE AUDIO PRODUCT

(Fire & Shock Hazard)

Before returning the audio product to the user, perform the

following safety checks.

1. Inspect all lead dress to make certain that leads are not

pinchedorthathardwareisnotlodgedbetweenthechassis

and other metal parts in the audio product.

2. Inspect all protective devices such as insulating materials,

cabinet, terminal board, adjustment and compartment

covers or shields, mechanical insulators etc.

3. To be sure that no shock hazard exists, check for leakage

current in the following manner.

* Plug the AC line cord directly into a 120 volt AC outlet.

* Using two clip leads, connect a 1.5k ohm, 10 watt resistor

paralleled by a 0.15µF capacitor in series with all exposed

metal cabinet parts and a known earth ground, such as

conduit or electrical ground connected to earth ground.

* Use a VTVM or VOM with 1000 ohm per volt, or higher,

sensitivity to measure the AC voltage drop across the

resistor (See diagram).

* Connect the resistor connection to all exposed metal parts

havingareturnpathtothechassis(antenna,metalcabinet,

screw heads, knobs and control shafts, escutcheon, etc.)

and measure the AC voltage drop across the resistor.

IMPORTANT SERVICE NOTES (FOR U.S.A. ONLY)

AllcheckmustberepeatedwiththeAClinecordplugconnection

reversed.

Anyreading of0.3 voltRMS (thiscorresponds to0.2 milliamp.

AC.) or more is excessive and indicates a potential shock

hazard which must be corrected before returning the audio

product to the owner.

SPECIFICATIONS

Specifications for this model are subject to change without

prior notice.

TO EXPOSED

METAL PARTS

CONNECT TO

KNOWN EARTH

GROUND

TEST PROBE

0.15 µF

1.5k ohms

10W

VTVM

AC SCALE

●General

Power source: AC 120 V, 60 Hz

DC 9 V ["D" size (UM/SUM-1, R20

or HP-2) battery ×6]

DC 4.5 V ["AA" size (UM/SUM-3,

R6 or HP-7) battery ×3 for backup

memory]

Power

consumption: 12 W

Output power: FTC; 2.0 W min. RMS per channel

into 4 ohms from 150 Hz to 20

kHz, with no more than 10 % total

harmonic distortion.

RMS; 2.3 W/CH

(DC operation, 10 % T.H.D.)

Speakers: 4" (10 cm) full-range speaker x 2

Output

terminals: Headphones; 16-50 ohms

(recommended; 32 ohms)

Dimensions: Width; 15-3/4" (400 mm)

Height; 6-1/4" (158 mm)

Depth; 8-3/8" (212 mm)

Weight: 6.0 lbs. (2.7 kg) without batteries

●Compact disc player

Type: Compact disc

Signal

readout: Non-contact, 3-beam semi-conduc-

tor laser pickup

Audio

channels: 2

Quantization: 16-bit linear quantization

Filter: 8-times oversampling digital filter

D/A converter: 1-bit D/A converter

Wow and

flutter: Unmeasurable

(less than 0.001% W. peak)

●Radio

Frequency

range: FM; 87.5 - 108 MHz

AM; 530 - 1,720 kHz

●Tape recorder

Frequency

response: 50 - 14,000 Hz (Normal tape)

Signal/noise

ratio: 50 dB

Wow and

flutter: 0.25 % (WRMS)

Motor: DC 9 V electric governor

Bias system: AC bias

Erase

system: Magnet erase

QT-CD250

– 3 –

NAMES OF PARTS

REMOTE CONTROL

Notes:

●Replace the batteries if the operating distance is

reduced or if the 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.

Remote Sensor

8" - 20'

(0.2 m - 6 m)

11.

(TAPE) Record Button

12.

(TAPE) Play Button

13.

(TAPE) Rewind Button

14.

(TAPE) Fast Forward Button

15.

(TAPE) Stop/Eject Button

16.

(TAPE) Pause Button

17.

Cassette Compartment

18.

CD Compartment

19.

(CD) Stop Button

(TUNER) Tuning Down Button

10.

(CD) Repeat Button

(TUNER) Band Selector Button

11.

(TUNER) Preset Memory Button

12.

Extra Bass Button

13.

(CD) Play/Pause Button

(TUNER) Tuning Up Button

14.

(CD) Track Up/Cue Button

(TUNER) Preset Up Button

15.

(CD) Track Down/Review Button

(TUNER) Preset Down Button

16.

Volume Up/Down Buttons

17.

Power/Function Switch

18.

(CD) Play Indicator

19.

(CD) Repeat Indicator

20.

(CD) Pause Indicator

21.

Extra Bass Indicator

22.

(TUNER) Memory Indicator

23.

(TUNER) FM Stereo Mode Indicator

24.

(TUNER) FM Stereo Indicator

25.

Battery Compartment

26.

FM Telescopic Rod Antenna

27.

Headphone Jack

28.

AC Power Input Jack

29.

Backup Memory Battery Compartment

30.

(CD) Play/Pause Button

(TUNER) Tuning Up Button

31.

(CD) Track Down/Review Button

(TUNER) Preset Down Button

32.

(CD) Stop Button

(TUNER) Tuning Down Button

33.

(CD) Repeat Button

(TUNER) Band Selector Button

34.

(TUNER) Memory Button

35.

(TUNER) Clear Button

36.

(CD) Track Up/Cue Button

(TUNER) Preset Up Button

37.

Extra Bass Button

38.

Volume Up/Down Buttons

25 26 27 28

31 37

12345

678

20 21 22 23

18 24

QT-CD250

– 4 –

132

Preparation for use /

Preparación para su uso

■AC power

■

Funccionamiento con corriente alterna

■Battery power

■

Funccionamiento con pilas

To anAC socket

A un tomacorriente de CA

To AC INPUT

A la tomaAC INPUT

AC 120 V, 60 Hz

120 V de CA, 60 Hz

●6 “D” size batteries

(UM/SUM-1, R20, HP-2 or similar)

●

6 pilas del tamaño “D”

(UM/SUM-1,R20,HP-2 o similares)

●Batteries are not included.

●

Las pians no están incluidas.

■Headphones

■

Auriculares

■Turning the power ON

and to OFF

■

Conexión(ON) y

desconexión(OFF) de la

alimentación

TUNER

OFF POWER

■Volume control

■

Control del volumen

Quick Guide /

Guía rápida

Listening to a CD /

Audictión de discos CD

Tostoptheplayback

Press the ■button.

TUNING

PLAY / PAUSE

OFF POWER

●Label side up.

●

Con el lado de

la etiqueta

encarada hacia

arriba.

Para detener la

reproducción

Pulse el botón

■

123 45

TUNER

Listening to a tape

Audictión de una cinta

TUNER

OFF POWER

Listening to the radio /

Audictión de la radio

Recording from CDs /

Grabaciones de discos CD

TUNER

OFF POWER

●Load the disc to be

recorded.

●

Introduzca el disco que

va a grabar.

123

134

BAND

REPEAT

TUNING

TUNING PLAY / PAUSE

STOP

TUNER

OFF POWER

TUNING

PLAY / PAUSE

Para detener la

reproducción

Pulse el botón

To stop the playback

Press the button.

To stop the recording

Press the button.

Para detener la

grabación

Pulse el botón

OPERATION MANUAL

QT-CD250

– 5 –

1 Top Cabinet/ 1. Screw ................... (A1) x7 5-1

Front Cabinet 2. Socket .................. (A2) x1

3. Screw ................... (A3) x1

2 Power PWB/ 1. Screw ................... (B1) x2 5-2

Terminal PWB 2. Hook..................... (B2) x2

3. Socket .................. (B3) x1

4. Hook..................... (B4) x2

3 Switch PWB 1. Screw ................... (C1) x2 5-2

2. Socket .................. (C2) x1

3. Hook..................... (C3) x2

4. Screw ................... (C4) x4

4 Main PWB/ 1. Socket ..................(D1) x1 5-2

CD Control PWB 2. Screw ................... (D2) x7

(Note) 3. Screw ................... (D3) x1

4. Solder...................(D4) x3

5. Socket .................. (D5) x3 5-3

6. Screw ................... (D6) x6

7. Hook..................... (D7) x2

5 CD Mechanism 1. Screw ................... (E1) x3 5-3

6 Tape Mechanism 1. Screw ................... (F1) x4 5-3

DISASSEMBLY

Caution on Disassembly

Followthebelow-mentionednoteswhendisassembling the

unitandreassemblingit,tokeepitsafeandensureexcellent

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.

STEP REMOVAL PROCEDURE FIGURE

Figure 5-3Figure 5-1

Figure 5-2

CD MECHANISM SECTION

Performsteps1to 4ofthedisassemblymethodtoremovethe

CD mechanism.

How to remove the pickup (See Fig. 5-4.)

1. Remove the screws (A1) x 2 pcs., to remove the shaft (A2)

x1 pc.

2. Remove the stop washer (A3) x1 pc., to remove the gear

(A4) x 1 pc.

3. Remove the pickup.

Stop

Washer

(A3) x1

Mechanism

Gear

(A4) x1

Shaft

(A2) x1

Pickup

(A1) x2

ø2.6 x6mm

REMOVING AND REINSTALLING THE MAIN PARTS

Figure 5-4

Note : (Figure 5-3 and Figure 5-4)

Afterremovingthe connector fortheopticalpickup from the

connector, wrap the conductive aluminium foil around the

front end of connector to protect the optical pickup from

electrostatic damage.

Top Cabinet

AC Socket

(B1)x2

ø3x12mm

(D2)x7

ø3x12mm

(C1)x2

ø3x12mm

(C4)x4

ø3x10mm

(D3)x1

ø2.5x8mm

Main PWB

Power PWB

(D4)x3

(B3)x1

(B2)x2

(B4)x2

(D1)x1

CD Lid

Switch

Power Transformer

Terminal

PWB

(C3)x2

Switch PWB

(C2)x1

(E1)x3

ø2.5x10mm (F1)x4

ø3x10mm

(D5)x1

(D5)x2

Top Cabinet

(D6)x6

ø3x8mm (D7)x2

Washer

CD Mechanism

CD Control

PWB

Tape

Mechanism

(A1)x3

ø3x12mm

Top Cabinet

Front Cabinet

(A1)x4

ø3x12mm

SP202

R-CH

Main

PWB

(A2)x1

(A3)x1

ø3x10mm

QT-CD250

– 6 –

TAPE MECHANISM SECTION

Performsteps1to6ofthedisassemblymethodtoremovethe

tape mechanism. (See page 5.)

How to remove the record / playback and erase

heads (See Fig. 6-1.)

1. Remove the screws (A1) x 2 pcs., to remove the record/

playback head.

2.Remove thehooks (A2)x 2pcs., towardthe centerposition

as shown in Fig. 6-1. and then extract the erase head

upward.

Note:

After replacing the heads and performing the azimuth

adjustment, be sure to apply screwlock.

How to remove the pinch roller (See Fig. 6-2.)

1. Carefully bend the pinch roller pawl in the direction of the

arrow <A>, and remove the pinch roller (B1) upwards.

How to remove the belts (See Fig. 6-3.)

1. Remove the main belt (C1) x 1 pc., from the motor pulley.

2. Remove the FF/REW belt (C2) x 1 pc., from the REW/FF

roller.

3. Put on the belts in the reverse order of removal.

Note:

Whenputting onthebelt,ascertainthatthebeltisnot twisted,

and clean it.

How to remove the motor

(See Figs. 6-4.)

1. Remove the mainbelt.

2.Removethescrew(D1)x1pc.,toremovethemotormount.

3. Remove the screws (D2) x 2 pcs., to remove the motor.

Note:

Whenmountingthemotor,payattentiontothemotormounting

angle.

How to remove the flywheel (See Fig. 6-5.)

1. Remove the belt.

2.Removethestopwasher(E1)x1pc.,withasmallprecision

screwdriver to extract the flywheel from the capstan metal.

Note:

When the stop washer is deformed or damaged, replace it

with a new one.

How to reinstall the parts

Installeachpart in thereverseorder of theremovalwithcare.

Figure 6-1

Figure 6-2

Figure 6-3

Figure 6-4

Figure 6-5

(A1) x1

ø2x7mm(A1) x1

ø2x3mm

Record/Playback

Head

Erase Head

Hook

(A2)x2

<A>

Pinch Roller

(B1)x1 Pinch Roller

Pawl

Motor

REW/FF

Clutch Ass'y

Flywheel

FF/REW Belt

(C2)x1

Main Belt

(C1)x1

(E1) x 1

Stop Washer

Washer

Flywheel

(D1)x1

Special

Screw

Motor Mount

Motor

(D2)x2

Special

Screw Motor

Mount

Motor

QT-CD250

– 7 –

MECHANISM SECTION

• Driving Force Check

PLAY: TW-2412 Over 120 g

Torque Meter Specified Value

• Torque Check

Torque Meter Specified Value

Play: TW-2111 25 to 65 g.cm

Fast Forward: TW-2231 60 to 130 g.cm

Rewind: TW-2231 60 to 130 g.cm

• Tape Speed

MTT-111 Variable 3,000 ±90 Hz Output: Speaker

resistor in Teaminal

motor. (M601) (CNP201 Load

resistance: 4 ohms)

Instrument

Connection

Specified

Value

Test

Tape

TAPE SECTION

Position of each switch or control

Volume control Max

Function switch Tape/Power Off

X-BASS On

• Bias Oscillation

Adjustment Point

• Playback Amplifier Sensitivity Check

Instrument Connection

Test Tape

MTT-118 1.1 V ±3 dB Speaker Terminal

(Load resistance: 4 ohms)

Specified Value

ADJUSTMENT

Figure 7 ADJUSTMENT POINTS

• Head Azimuth

Torque Meter Specified Value

MTT-114 Output: Speaker Terminal

(CNP201 Load resistance: 4 ohms)

Adjusting

Point

Specified Value Instrument

Connection

L301 82 kHz ±6 kHz Pin 2 of CNP201

- 6 kHz

• AM IF/RF

Signal generator: 400 Hz, 30%, AM modulated

TUNER SECTION

fL: Low-range frequency

fH: High-range frequency

AM IF 450 kHz 1,720 kHz T3 *1

AM Band — 530 kHz (fL): L4 *3

Coverage 1.0 ±0.05V

AM Tracking 600 kHz 600 kHz (fL): L3 *2

1,400 kHz 1,400 kHz (fH): TC1

Test Stage Frequency Frequency

Display Setting/

Adjusting

Parts

Instrument

Connection

*1. Input: Antenna, Output: TP1

*2. Input: Antenna, Output: Speaker terminal

•FM RF

Signal generator: 1 kHz, 75 kHz dev., FM modulated

FM Band — 87.5 MHz (fL): L2 *1

Coverage 1.7 V ±0.05V

FM RF 98.0 MHz 98.0 MHz L1 *2

(10-30 dB)

Test Stage Instrument

Connection

Frequency Frequency

Display Serring/

Adjusting

Point

*1. Input: Antenna, Output: Pin 16 of IC1

*2. Input: Antenna, Output: Speaker Terminal

*3. Input: Input is not connected, Output: TP1

SW102

CNP101

L301

CNP602

IC1

TC1

HPJ201

HEADPHONE

IC101

CNP201

FM IF

AM BAND

COVERAGE fL

TP1

AM BAR

ANTENNA

TRACKING fL

TRACKING fH

AM IF

FM BAND

COVERAGE fL

BIAS OSC.

MAIN PWB

QT-CD250

– 8 –

A. CD TEST MODE

Set the function switch to "CD" when pressing the "REVIEW(PRESET DOWN )" button together with "STOP(TUNING DOWN)"

button.

Step-1. CD Pickup can be move when press the "CUE" button either "REVIEW" button.

"CUE" button : CD Pickup move to out side of disc.

"REVIEW" button : CD Pickup move to in side of disc.

(CD Pickup can't move any more, if reach to most in side.)

Note: If the CD Lid open (SW810 open), the unit can be operate Step-1 only and the unit can't operate from Step-2 to Step-5.

Step-2. The LASER light up when press the "PLAY/PAUSE" button.

Step-3. CD disc can be playing mode when press the "PLAY/PAUSE" button during the LASER ON.

The LCD displays indicate the "Track Number" and the "Playing Time".

Step-4. CD disc will be stop and the LASER goes out when pressing the "STOP" button, and return back to Step-1. (CD Pickup

position keeps at that point).

Step-5. It can be control to ON/OFF of the Tracking Servo when press the "MEMORY" button during the CD playing mode.

(The Servo will be ON when playing mode again, if to make stop mode during the Servo OFF condition.)

The LCD displays indicate the playing time of CD Pickup point.

(The LCD displays indicate the playing time at that point when Pickup moving, if press the "CUE" button or press the "REVIEW"

button.)

QT-CD250

– 9 –

B. TUNER TEST MODE

Set the function switch to "TUNER" when pressing the "REVIEW(PRESET DOWN )" button together with "BAND(REPEAT)"

button.

The LCD displays indicate the "TunEr" for several seconds. after that, the LCD displays indicate to the normal frequency.

Note:

1. The Preset Channel can be change when press the "PRESET UP (CUE) button either "PRESET DOWN (REVIEW)" button.

PRESET UP button is pressed : P-01 -> P-02 -> > > > > P-15 -> P-01

PRESET DOWN button is pressed : P-15 -> P-14 -> > > > > P-01 -> P-15

2. The Tuner Mode can be change when press the "BAND (REPEAT)" button.

BAND button is pressed : FM stereo -> FM mono -> AM -> FM stereo

PRESET.

NO U.S.A. FM MODE

P-01 FM 87.5 MHz STEREO

P-02 FM 108.0 MHz STEREO

P-03 FM 98.0 MHz STEREO

P-04 FM 90.0 MHz STEREO

P-05 FM 106.0 MHz STEREO

P-06 AM 530 KHz

P-07 AM 1720 KHz

P-08 AM 990 KHz

P-09 AM 600 KHz

P-10 AM 1400 KHz

P-11 FM 106.0 MHz MONO

P-12 FM 90.0 MHz MONO

P-13 FM 98.0 MHz MONO

P-14 FM 108.0 MHz MONO

P-15 FM 87.5 MHz MONO

C. LCD TEST MODE

Set the function switch to "TUNER (or CD)" when pressing the "REVIEW(PRESET DOWN )" button together with "MEMORY"

button.

All of the segments will light up.

QT-CD250

– 10 –

D. VOLUME TEST MODE

Set the function switch to "POWER ON (TAPE PLAY, TUNER or CD)" when pressing the "REVIEW(PRESET DOWN )" button

together with "PLAY/PAUSE (TUNING UP)" button.

The LCD display do not indicate the VOLUME level at this time.

But, the VOLUME level is "12" which is defaults level.

The VOLUME LEVEL can be change when press the "VOLUME UP" button either press the "VOLUME DOWN" button.

"VOLUME UP" button is pressed : (12 VoL) -> 30 VoL -> 30 VoL (30 is flashing)

"VOLUME DOWN" button is pressed : (12 VoL) -> 1 VoL-> 0 VoL -> 0 VoL (0 is flashing)

QT-CD250

– 11 –

NOTES ON SCHEMATIC DIAGRAM

1. Tuner

( ): AM mode

Marking except for ( ): FM mode

2. CD

( ): Play mode

Marking except for ( ): Stop state

3. Deck section

( ): Record mode

Marking except for ( ): Playback mode

Display / Control section:

( ): Active state

Marking except for ( ): CD Function mode at stop state

• Schematic diagram and Wiring Side of P.W.Board for this

model are subject to change for improvement without prior

notice.

• 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.

• Resistor:

To differentiate the units of resistors, the 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 an

ohm resistor. The resistor designated "Fusible" is a fuse type

resistor

• Capacitor:

To indicate the unit of capacitor, a symbol P is used: this

symbolPmeansmicro-micro-faradandtheunitofthecapacitor

withoutsuchasymbolismicrofarad.Astoelectrolyticcapacitor,

the expression “capacitance/withstand voltage” is used.

(CH), (TH), (RH), (UJ): Temperature compensation

(ML): Mylar type

(P.P.): Polypropylene type

•Theindicated voltage ineachsection is theonemeasuredby

Digital Multimeter between such a section and the chassis

with no signal given.

SW102 RECODE/PLAYBACK REC—P.B.

SW201 FUNCTION SELECTOR TAPE/OFF—

TUNER/ON—CD/ON

SW601 TAPE MAIN OFF—ON

SW702 PICKUP IN OFF—ON

SW801 PLAY/PAUSE/ OFF—ON

TUNING UP

SW802 STOP/TUNING DOWN OFF—ON

SW803 REPEAT/BAND OFF—ON

SW804 TUNER/MEMORY OFF—ON

SW805 CUE/PRESET UP OFF—ON

SW806 REVIEW/ OFF—ON

PRESET DOWN

SW807 VOLUME UP OFF—ON

SW808 VOLUME DOWN OFF—ON

SW809 X-BASS OFF—ON

SW810 CD LID OFF—ON

REF. NO DESCRIPTION POSITION

Figure 11 TYPES OF TRANSISTOR

ECB

(S)(G)(D)

(1) (2) (3)

FRONT

VIEW

KRA102 M

KRC107 M

KTA1046 Y

KTA1266 GR

KTA1273 Y

KTC3199 GR

QT-CD250

– 12 –

1234 5 6

• The numbers 1 to 17 are waveform numbers shown in page 16.

Figure 12 SCHEMATIC DIAGRAM (1/2)

COR1

C856

100P

C29

100P R865

47K

D804

1N4148

C75

100P

C34

220P

C33

220P

0.1

COR801

BI801 BI802

C805

0.022

C806

330/10

R853

2.2K

R852

2.2K

C807

0.047

IC803

LA6541D

30 29 28 27 26 25 24 23 22 21 20

19 18 17 16

R851

2.2K

R76

820

L51

100µH

C54

0.022

R13

10K

R18

100

C68

220P

R77

3.3K

R17

47K

R14

2.2K

C58 100P

C57 100P

C18 0.001

R20

470

R879

4.7K

D806

1N4148 R862

47K

R861

10K

CF4

R854

100

C12

1/50

R58

R15

39K

R71

4.7K

R74

3.3K

R73

3.3K

C26

0.1

C23

10/16

0.001

R845

22K

R866

3.3K D802

1N4148

C245

1/50

C243

330P

C244

330P

R242

10K

R241

10K

C242

1/50

C241

1/50

R240

2.2K

R239

2.2K

R238

2.7K

C224

0.1/50 C223

0.1/50

R237

2.7K

R236

47K R235

47K

R233

2.2K

R234

2.2K

SW201-C

SW201-B

0.022

C10

L803

220µH

R850

1.5K

R249

220

C74

1/50

R72

4.7K

C825

47/16

C247

220/10

R247

560

R248

560

R246

5.6K

R244

560K

R243

560K

R245

5.6K

R51

150

C61

100/10

C73

1/50

R54

10K

R354

4.7

R353

33K

C353

0.0056

(ML)

R352

150

C354

0.022(ML)

C352

100/10

R351

100

R126

100

L301

C351

0.0022(ML)

R124

3.3K R123

3.3K

R121

2.7K

R122

2.7K

X51

4.5MHz

R456

15K

R458

R457

R455

15K

R62

R61

R60

R59

C60

0.0022

C59

0.01

C55

2.2/50

R53

4.7K

R52

2.2K

C53

100/10

TC1

220K

C11

360P

VD3

KV1520NT

C25

0.047

C27

0.001

15K

100K

C24

0.1

C19

2.2/50

R12

10K

VD2

KV1370NT

22K

22P(CH)

C32

0.1

3.3K

0.01

0.001

VD1

KV1370NT

100K

15P(CH)

C830

0.01(ML)

C828

0.0027

C829

0.0047

R832

3.3K

C827

0.015(

R827

15K

C835

470P

R831

3.3K

R830

10K

R829

3.3K

R812

R834

3.3K

C833

0.033(ML)

R833

3.3K

C854

0.0068

IC801

TA2109F

C819

0.1(ML)

R802

2.2K

C818

56P

C822

0.047

C863

47/16

C841

0.047

C842

0.047

C843

47/16

C826

47P

R826

220K

1N4148

R16

3.3K

C22

1/50

C14

0.047

C71

0.022(ML)

C72

0.022

(ML)

C16

4.7/50

CF1

CF3

C15

220/10

R10

330

C13

0.47/50

IC1

24 23 22 21 20 1918 17 16 15 14 13

C21

10/16

C20

330P

C51

15P

(CH)

C52

12P

(CH)

IC51 LC72121

1110 987654321

R55

56K

C56

0.022

C821

100/10

R806

2.7K

R807

C801

0.01 R805

39K

C820

0.1(ML)

R811

22K

C804

2P(CH)

R803

82K

C813

47/16 C814

0.047

R804

68K

D101

1N4148

R110

120

R108

R115

3.9K

C118

10/16

R125

680K

R104

12K R103

12K

C121

0.01

C113

47/16

C110

270P

R114

8.2K

R113

8.2K

C119

2.2/50

C105

0.0018

R101

330

R120

3.3K

R105

15K

C112

330P

R116

3.9K

C116

0.018

(ML)

R106

15K

C106

0.0018

C122

0.01

R119

3.3K

R118

3.9K

CNP101

R102

330

C117

10/16

D102

1N4148

C115

0.018(ML)

R107

C111

330P

C108

820P

R117

3.9K

C120

47/16

C123

220/10

C114

47/16

C109

270P

C107

820P

R109

120

IC101

BA3311L

C817

100/10

C816

0.022

C815

47/16

BI803

C802

0.022

R820

47K

X801

16.93MHz

C838

0.047(ML)

C839

0.047(ML)

C834

470P

C836

0.047(ML)

C845

0.047

C837

0.047(ML)

R828

10K

R801

C832

47/16

NC NC

Speaker Case

MONO/

FM/AM

BO1

VSSD

BO4

BO3

BO2

VSSA

VCO

FM/AM

IND

OUT

AM IF

MIX

FM RF

R-CH

L-CH

FM DET

AM IF

FM OSC

FM RF

MPX

DET

OSC

OUT

OSC

AM RF

OSC

GND

AM LOW

CUT

OUT

VCC

FM IF

AGC

GND

LPF2

LPF1

REQ

OUT

VCC

FM RF

QUAD

AOUT

IO2

IFIN

AMIN

FMIN

AIN

VDD

IO1

XINXOUT

R-CH

L-CH

TRO

FOO

DMO

FMO

VCC

VREF

RES

REG IN

REG OUT

VIN4

VIN3

VIN2

GND

7.5V

GND

VG4

VG3

VG2

VO4-

VO4+

VO3-

VO3+

VO2+

VO2-

VO1-

VO1+

VG1

VIN1

VCC

SW810

OPEN/CLOSE

CD LID

CNS802

CNS801

CNS803

R-CH(CD)

L-CH(CD)

GND(AUDIO)

+7.5V(CD)

CNP803

ROD

ANTENNA

SW601

TAPE

MAIN

M601

TAPE

MOTOR

ALC T

FILTER

VCC

GND

NF1

NF2

IN2

IN1

OUT2

OUT1

RPRE AMP

M702

SPINDLE

MOTOR

M701

SLED

MOTOR

SW702

PICKUP IN

SP+

SP-

SL+

SL-

PU-IN

TR+

TR-

FO+

FO-

R-

R+

2200P

CD MOTOR PWB-B

FC-

FC+

TR-

TR+

GND

VCC

FNI

FPI

TPI

TNI

MDI

LDO

SEL

TEB

2VRO

TEN

TEO

RFN

GND

RFO

AGCI

RFGC

RFGO

RFIS

RFRP

VRO

FEN

FEO

SBAD

MON

LTOH30P1

SLT-

SLT+

FM-

FM+

DM-

DM+

5 4

TA2104BN

SW102-D

SW102-H

SW102-E

SW102-A SW102-F

SW102-G

SW102-B

SW102

RECORD/

PLAYBACK

PICK-UP UNIT

F+

F-

SW102-C

654 16 17 18

321

Q801

KTA1266 GR

AM BAR ANTENNA

FM BAND

PASS

FILTER

SW102

RECORD/

PLAYBACK

19 20 21

14 15

23 24

KTC3199 GR

Q351

KTC3199 GR

11 10

Q210

KTC3199 GR

Q209

KTC3199 GR

VSSX

Q803

KRC107 M

Q802

KTA1273 Y

Q806

KTA1273 Y

Q805

KRC107 M 2

Q804

KTA1

SWIT

KRA102 M

TUNER

SWITHCING

Q211

KTC3199 GR

Q212

KTC3199 GR

4.4V

1.9V

0.5V

3.8V

3.7V

1.9V

1.9V 0.8V

1.9V

0.9V

1.9V

0.5V

1.9V

0.1V

GND

1.9V

VCC

1.9V

3.4V

GND

3.4V

1.9V

1.9V 1.9V

1.9V

3.4V

1.9V

7.5V

LASER DRIVER

4.4V(ON:2.8V)

1.4V(ON:1.9V)

3.7V(ON:2.1V)

SWITCHING 7.5V

7.5V(TUN:0V)

6.9V

(TUN:7.5V)

GND

SWITCHING

(TUN:7.5V)

4.5V

(TUN:

0.5V)

4.4V

GND

(TUN:7.5V)

4.4V

SWITCHING

5.0V

(TUN:0V)

4.3V

(TUN:5.0V)

SWITCHING

IC801

SERVOPREAMP.

TA2109F

IC803

FOCUS/

TRACKING/

SPIN/

SLED DRIVER

LA6541D

AM BAND

COVERAGE fL

FM BAND

COVERAGE fL L2

NO. VOLTAGEIC1

0.82V(0V)

0V(0V)

0.V

3.5V(4.1V)

3.7V(4.1V)

3.2V(4.1V)

3.7V(4.1V)

GND

0.4V(0.1V)

3.0V(3.6V)

1.2V

NO. VOLTAGE

2.9V(0V)

3.1V

0.7V

1.0V

0.9V

5.0V

3.6V(4.0V)

3.7V(4.1V)

( ): AM

CNS101

L-CH

R-CH

ERASE HEAD

RECORD/

PLAYBACK HEAD

TAPE

IC51

LC72121

ELECTRONIC

TUNING

IC1

FM/AM IF MPX.,

TA2104BN

IC101

REC./P.B.EQUALIZER AMP.

BA3311L

AM OSC.

AM TRACKING fL

AM TRACKING fH

AM IF

FM IF

0.6V

0.6V 3.2V

3.1V

7.3V

VOLTAGE:

PLAY and REC.

SW102

RECORD/

PLAYBACK SW102

RECORD/

PLAYBACK

SW102

RECORD/

PLAYBACK

SW201

FUNCTION

SELECTOR

BIAS OSC.

SW102

RECORD/

PLAYBACK

+B +B

NO.

IC51

1.6V

GND

0.V

4.9V

3.1V

2.9V

5.0V

0.9V

GND

1.5V

3.2V

0.9V

1.7V

GND

1.6V

VOLTAGE

FM ST FM MONO AM

1.6V

GND

0.V

4.9V

2.9V

5.0V

0.9V

GND

1.5V

3.2V

0.9V

1.7V

GND

1.6V

GND

0.V

4.9V

0.7V

5.0V

0.9V

GND

2.0V

4.2V

0.9V

1.0V

GND

2.6V

GND 0V

5.0V

(CD: 0.4V)

GND

(CD: OPEN)

TUNER

MUTE

0V 0V

(REC: 4.0V)

(REC: 0.4V)

BIAS OSC.

GND

0V(OFF:0.6V)

0V GND

0.2V

0.2V 2.0V

2.0V

0.8V

Q209,Q210

X-BASS ON/OFF

Q211,Q212

LINE AMP

QT-CD250

– 13 –

Figure 13 SCHEMATIC DIAGRAM (2/2)

78 9101112

• NOTES ON SCHEMATIC DIAGRAM can be found on page 11.

C302

0.022

C872

0.0047

L807

0.82µH

C249

100P

C204

0.022

D202

1N4148

C870

100P R871

4.7K

R253

3.9K

R856

15K

FW801

FW802

R214

R215

R216

R210

R209

R218

8.2K R217

8.2K

D806

1N4148 R862

47K

C201

100/16

C230

1/50 R222

4.7K C214

1/50

R221

4.7K

C213

1/50

R870

4.7K

R869

4.7K

LCD801

321

CNP602

CNS602

SW809

X-BASS R857

47K

R854

100

C226

0.022

CNS801

CNP801

D803

1N4148

R855

18K

R841

5.6K

R848

10K R849

18K

R847

5.6K

R843

4.7K

R846

4.7K

R821

R876

10K

C862

0.1

X802

4.19MHz

C846

1/50

D805

1N4148

C211

0.047

C212

0.047

R202

10K

R205

4.7K

C203

0.01

C202

47/16

R201

1.2K

R203

270

ZD201

DZ5.1BSB

D203

1N4148

R901

47K

R900

47K

R899

47K

R898

47K

R897

47K

R896

47K

R895

47K

R894

47K

R893

47K

R892

47K

R891

47K

R890

47K

R889

47K

R888

47K

R887

47K

R886

47K

R885

47K

R884

47K

R883

47K

R882

47K

C865

100/10

C864

0.1

R873

4.7K

R878

10K R877

10K

R875

10K

R868

4.7K

C231

1/50

R251

22K

R252

22K

C229

1/50

D801

1N4148

C245

1/50

C243

330P

C244

330P

R242

10K

R241

10K

C242

1/50

C241

1/50

R240

2.2K

R239

2.2K

R238

2.7K

R237

2.7K

C232

1/50

R872

4.7K

R867

4.7K

R825

10K

R839

47K

R860

4.7K R863

1.8K

C847

22/16

C848

22/16

C853

0.022

C844

100/10

R836

270 R835

270

C220

1/50

C219

1/50

C210

0.022

D204

1N4148

D205

1N4148

R206

560

R204

2.2K

C206

47/16

C209

0.01

ZD202

DZ7.5BSB

R213

100

R212

47K R211

47K

R225

100K

C653

0.022

D653

1N4004 D652

1N4004

C652

0.022

D654

1N4004 D651

1N4004

C654

0.022 C651

0.022

R249

220

R224

4.7K

C246

10/16

R223

4.7K

C825

47/16

D201

1N4148

R864

L801

220µH

R250

470K

C247

220/10

R247

560

R248

560

R246

5.6K

R244

560K

R243

560K

R245

5.6K

SW201-D

SW201-A

R230

2.7

354

MHz

R456

15K

R458

R457

R455

15K

ZD203

ZD2.4BSB

C810

10/16

R808

100

C830

0.01(ML)

C828

0.0027

C829

0.0047

R832

3.3K

C827

0.015(ML)

R827

15K

R831

3.3K

R830

10K

R829

3.3K

R812

R834

3.3K

C833

0.033(ML)

R833

3.3K

C823

0.022

C840

0.1

C854

0.0068

IC802

SERVO/

SIGNAL

CONTROL

TC9457F2

100

50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31

C852

3.3/50 C851

3.3/50

C849

0.0022

C850

0.0022

R844

22K

C826

47P

R824

10K

R826

220K

R842

22K

R838

10K R837

10K

R207

560

C207

470/10

C208

0.022

C205

47/16

C218

0.0015(ML) C217

0.0015(ML)

R220

220K

IC202

87654 3 2 1

C216

0.1(ML)

R219

220K

C215

0.1(ML)

C236

100/10

R232

120

C221

0.001

C222

0.001

C235

100/10

R231

120

C225

100/10

12 2

C239

0.1(ML)

C238

100/10

C237

100/10

C234

470/10

C233

470/10

CNP201

R228

120

R227

120

HPJ201

HEADPHONES

R820

47K

X801

16.93MHz

C824

47/16

C845

0.047

R828

10K

R840

C227

4700/16

X-BASS

SWITCH PWB-A4

P_MUTE

STB_(VOL)

CE_(PLL)

POWER

HOLD

7.5V

X-BASS

TUNER-

FUNC

SEG17

CD-FUNC

KEY2

KEY1

ADIN3

SEG16

SEG15

VSS

STB

DATA

+5V(u COM)

+4.5V(BACK UP)

DC 9V ["D" size (UM/SUM-1,R20 or

HP-2) battery x 6]

TAPE

TUNTUN

MEMORY

KHz

MHz

CNS201

BATTERY

SP202

SP201

POWER PWB-A3

R-CH(CD)

L-CH(CD)

GND(AUDIO)

GND(POWER)

GND(CD)

SPEAKERS

L-CH

R-CH

4 OHM

+5V(CD)

SELECTOR

SW601

TAPE

MAIN

M601

TAPE

MOTOR

TAPE

CD CD AC/DC

AC INPUT

IC201

TA8227P

POWER AMP.

MVSS1

MVDD1

SEG1

COM1

MVDD

MVSS

MXI

MXO

REMO-IN

RESET

DVSL

DVRL

DVDD

DVRR

DVSR

TEST0

DOUT

SBSY

SBOK

VDD1

VSS1

P2VREF

PDO

TMAX

LPFN

LPFO

PVREF

VCOF

AVSS

SLCO

RFI

AVDD

RFCT

RFZI

RFRP

FEI

SBAD

TEI

TEZI

FOO

TRO

VREF

RFGC

TEBC

FMO

DMO

2VREF

SEL

VDD2

VSS2

XVDD SEG2

SEG3

SEG4

SEG5

SEG6

SEG7

SEG8

SEG9

SEG10

SEG11

SEG12

SEG13

SEG14

DOOR IN

PU IN

TEST1

TEST2

TEST3

TEST4

TEST5

XVSS

COM2

COM3

COM4

CD CONTROL PWB-A2

SO651

AC INLET

SOCKET

AC 120V,60Hz

T651

POWER TRANSFORMER

12 12

Q204

KTA1273Y

16 17

99 GR

Q210

KTC3199 GR

Q209

KTC3199 GR

Q805

KRC107 M 2

Q804

KTA1266 GR

SWITCHING

102 M

NER

HCING

Q211

KTC3199 GR

Q212

KTC3199 GR

Q205

KTC3199 GR

Q206

KTA1046 Y

Q207

KTC3199 GR

Q203

KTA1266 GR

C240

0.1(ML)

Q201

KTC3199 GR

Q202

KTC3199 GR

VDD

11 11

10 10

11 11

SW808

VOLUME DOWN

SW807

VOLUME UP

UN801

REMOTO SENSOR

N64H380A

DC 4.5V ["AA" size (UM/SUM-3,R6 or

HP-7) battery x 3 for backup memory]

BATTERY

LCD DISPLAY

TERMINAL A PWB-A5/

TERMINAL B PWB-A6

MAIN PWB-A1

5.0V

0.6V(TUN: 5.0V)

4.9V(TUN: 0V)

5.0V(TUN:0V)

0V(TUN: 5.0V)

5.0V

2.5V

5.0V

GND

0V(TUN: 4.9V)

5.0V

(TUN:0V)

GND

0V(TUN:5.0V)

0V(X-BASS OFF:4.9V)

4.4V(TUN:0V)

GND

3.7V

(TUN:0V)

1.9V

(TUN:0V)

1.5V

(TUN:0V)

3.7V

(TUN:0V)

1.9V

(TUN:0V)

1.7V

(TUN:0V)

GND

1.9V(TUN:0V)

4.4V(TUN:0V)

1.9V(TUN:0V)

0.9V(TUN:0V)

1.9V(TUN:0V)

0.7V(TUN:0V)

1.9V(TUN:0V)

0.5V(TUN:0V)

1.9V(TUN:0V)

3.7V(TUN:0V)

4.4V(TUN:0V)

GND

2.0V(TUN:0V)

(TUN:0V)

4.4V

(TUN:0V)

GND

2.2V

(TUN:0V)

2.1V

(TUN:0V)

4.2V(TUN:0V)

2.1V(TUN:0V)

2.2V(TUN:0V)

GND

2.5V

2.4V

GND

5.0V

2.3V

5.0V

4.4V

GND

(TUN:7.5V)

4.4V

WITCHING

RECORD SIGNAL

PLAYBACK SIGNAL

CD SIGNAL

FM SIGNAL

AM SIGNAL

14 15

R AMP.

IC202

ELECTRONIC

VOLUME

TC9260P

SW201

FUNCTION

SELECTOR

SW201

FUNCTION

SELECTOR

SW801

PLAY/PAUSE/

TUNING UP

SW802

STOP/

TUNING

DOWN

SW803

REPEAT/

BAND

SW804

TUNER/

MEMORY

SW805

CUE/

PRESET

SW806

REVIEW/

PRESET

DOWN

+B +B+B

+B +B

5.0V

.4V)

GND

(CD: OPEN)

8.2V-

8.4V

4.5V-

4.2V

8.6V-

8.0V

GND

0.6V

5.0V-

4.6V

8.6V-

8.0V

4.5V-

4.2V

9.0V

GND

2.5V

GND 0V 0V

0V 2.5V

2.5V

2.5V 4.6V

0V 0V

(REC: 4.0V)

.4V)

OSC.

GND

0V(OFF:0.6V)

0V GND

0.2V

0.2V 2.0V

2.0V

0.8V

0.V

0V GND

GND

0V(ON:0.6V)

4.8V(ON:4.4V)

(ON:4.4V)

4.4V(ON:3.8V)

SWITCHING MUTE

MUTE

7.5V

8.4V

7.0V

8.4V

7.5V REGULATOR

7.5V

REGULATOR

7.5V

5.0V

7.0V

4.4V

7.0V

4.9V

Q204,Q205:5V

REGULATOR

Q211,Q212

LINE AMP

QT-CD250

– 14 –

Figure 14 WIRING OF P.W.BOARD (1/2)

1234 5 6

• The numbers 1 to 17 are waveform numbers shown in page 16.

CNS801

SW809

X-BASS

R808

C810

R809

UN801

R857

SW808

VOLUME

DOWN

R855

SW805

CUE/

PRESET UP

SW801

PLAY/PAUSE/

TUNIG UP

FW802

R847

R841

LCD801

R849

R848

SW802

STOP/TUNING

SW803

REPEAT/

BAND

R246

C247

R245

R248

Q212 C231

R244 R247

C244

Q211

R240 R243

C242

CNP801

C243

R236 R239

R238 C241

R234

R235

SW804

TUNER/

MEMORY

C224

R237

R233 C223

Q210

Q209

R241

C245

R74

R242

R73

R458

SW201

R856

SW806

DOWN/

REVIEW/

PRESE

FW801

SW807

VOLUME

C51

X51

R62

R61

IC51

R60

R59

R58

R55

R13

R76

R51

C75

R873

R877

COR801

R878

R875

R879

R872R871

R843

R846

R876

R882

C865

R883

R884

R885

R888 R886

R889 R887

R890

R891 R893

R892 R894

R895

R898

R899

R900

R901 X802 X801

R839

C845

C846

R842

R844

Q805

R825

C832

L801

C853

R835

D806

R862

C847

C848

Q804

C844

R836

R860

R854

C849 C850

R837 R838

C851 C852

R455

R456

D805

D803

R214

R457

R250

Q203

C207

R253

ZD203

C220

R216

R215

C214

Q202

R212

R225

R224

C235

C246

R223

Q201

R231

R207

IC202

C215

R211

C219

R219

C217

R217

R209

C213

R251

C208 R210

C229 R221

C205

R213

C232 C230

R252

R249

CNP201

R125

C120

C123

R124

R119

C121

D102

R123

R117

C117

IC101

C105

R105

D101

R115 C115

R113

C113

R109

C109

C111

R121

R104

R101

R107

C107

R103

CNP101 C351

L301

R351

C354

C108

R102

R108

R352

R116

C106

R106

R354

Q351

R353

C353

C352

C112

C110

R110

C114

R114

C116

R126

R118

C118

R122

C119

R120

C122

C233

C234

CNP602

C239

R230

C226 C240

C201 D201

C237

C238

IC201

C225

R232

C236

C221

C222

C210

C302

C227

C212

D801

C837

R812

C854

C825

C821

C822 C813

R803

C836

R834

C814

R833 C818

R832

R831

R807

R830

C819

R829

C829

C863

C816

C833

R828

C841

R805

C804

R806

C820

C801

C828 R804

C815 C802

C830 R801

Q801

C817

R826

R824

C827

R827

C826

R820

C824

C838

C839

C835

C834

C842

C843

L803

R852

R868

R867

Q806

R870

R845

R866

D802

R869

IC803

Q803

R851

D804

BI803

R850

L807

TC1

C27

C10

C29

VD3

C12

C11

R54

C61 C6

C54

VD2

C7 R4

L51 C56

C53

R12

IC1

R53

C60

C23

C21

C59

R52

C55

C20

C52

C22

C26

C24

R15

R18 Q1

R16

R17

C19 R71 C73 C74

R72

C72

C71 C16 C25

CF4

CF1

C14

CF3

R10

C13 D1

VD1

C856

R865

Q802

C806

COR1

C807

R853 BI801 R802

BI802 R811

R204

D204

D205

C211

R202

Q204

R201

D203

D202

C204

R203

R205

Q206

ZD202

ZD201

C209

Q207

C206

R206

Q205

C203

C202

C249

R228

R227

R254

C216

R222

R218

C218

R220

R861

C15

R840

13 14

1 2 3

51 7

1 2 3 4

ABCD

EFG

B C E

E C B

151015 2025 354045

3031

525

11 12

1 2 3

3 2 1

HPJ201

HEADPHONES

PLAY REC

SW102

RECORD/

PLAYBACK

1 2 3

11 12

100

C870

C864

IC802

R896

R897

C862 R863

R864

R821

C840

C872

IC801

C823

C805

C32

C68 C18 R14

C58 R20 C34

R77

C33

13 12

15 10

520

24 1

C57

SPEAKERS

SP201 SP202 R-CH

L-CH

CNS201

MAIN PWB-A1

CD CONTROL

PWB-A2

SWITCH

PWB-A4

AM BAR ANTENNA

CNS802

CNS801

SW810

CD LID

OPEN/CLOSE

SW201

FUNCTION

SELECTOR

TUNER TAPE

OFF

POWER ON

1415

(245)

SP202

(R-CH)

QT-CD250

– 15 –

Figure 15 WIRING OF P.W.BOARD (2/2)

78 9101112

F3895AF

C651

C654

D651

D654

C653

D652

D653

C652

(241) (241)

(241)

CNS602

FM ROD ANTENNA(237)

RECORD/PLAYBACK

HEAD(240-4)

ERASE HEAD

(240-5)

TAPE

CNS101

COLOR TABLE

RD(R)

WH(W)

BROWN

RED

ORANGE

YELLOW

GREEN

BLUE

VIOLET

GRAY

WHITE

BLACK

PINK

T651

POWER

TRANSFORMER

(229)

(230)

BATTERYS

DC9 V [ "D" size(UM/SUM-1,

R20 or HP2) battery x 6 ]

TAPE MOTOR

(240-6)

M601

TAPE MAIN

(240-7)

SW601

SW702

PICKUP IN

M702

SPENDLE MOTOR

M701

SLED MOTOR

CNP803

54321

78 654321

PICK UP UNIT

CD MOTOR PWB-B

POWER PWB-A3

TERMINAL B PWB-A6

TERMINAL A PWB-A5

RD RD

SO651

AC INLET

SOCKET

AC 120V,

60Hz

(233)

CNS803

BATTERYS

DC4.5V ["AA" SIZE(UM/SUM-3,

R6 or HP7)battery x 3]

QT-CD250

– 16 –

WAVEFORMS OF CD CIRCUIT

NO DISC FOCUS SEARCH STOP PLAY

FOO 1 TMAX 1

FO+ 2 SBOK 2

FO- 3 DMO 3

FOCUS SEARCH TOC IL STOP PLAY

SEL 1 TEI 1

FEI 2 TRO 2

TEI 3 FMO 3

STOP PLAY CUE

FEI 1 TEI 1

SBAD 2 TRO 2

RFO 3 FMO 3

STOP PLAY REVIEW

FEI 1 TEI 1

RFGO 2 TRO 2

RFRP 3 FMO 3

STOP PLAY TCD-782 TNO-02 PLAYBACK

TEI 1LO 1

TRO 2

RO 2

SBAD 3

IC802 66pin

IC803 20pin IC802 45pin

IC803 21pin IC802 72pin

IC802 74pin

IC802 62pin IC802 67pin

IC802 64pin IC802 71pin

IC802 62pin

IC802 63pin IC802 67pin

IC801 22pin IC802 71pin

IC802 62pin

IC801 19pin IC802 67pin

IC801 17pin IC802 71pin

IC802 64pin

IC802 67pin

IC802 63pin

IC802 86pin

IC802 64pin

IC802 50pin

IC802 82pin

QT-CD250

– 17 –

TROUBLESHOOTING (CD SECTION)

HOW TO USE

1. Using the brush in the cleaner cap, apply 1 or 2 drops of the cleaning fluid to the brush on the CD cleaner disc which has

the mark next to it.

2. Place the CD cleaner disc onto the CD disc tray with the brush side down, then press the play button.

3.Youwillhearmusicforabout20secondsandtheCDplayerwillautomaticallystop.Ifitcontinuestoturn,pressthestopbutton.

CAUTION

TheCD lenscleanershouldbeeffectivefor30 -50operations,howeverifthebrushes becomeworn outearlierthenplease

replace the cleaner disc.

If the CD cleaner brushes become very wet then wipe off any excess fluid with a soft cloth.

Do not drink the cleaner fluid or allow it to come in contact with the eyes. In the event of this happening then drink and / or

rinse with clean water and seek medical advice.

The CD cleaner disc must not be used on car CD player or on computer CD ROM drives.

Cleaning Disc

PARTS CODE:

UDSKA0004AFZZ

Cleaner Liquid

Figure 17

When the CD does not function

When the CD section does not operate when the objective lens of the optical pickup is dirty, this section may not operate. Clean

theobjective lens,and checkthe playbackoperation. Whenthis sectiondoes notoperate evenafter theabove stepis taken,check

the following items.

Remove the cabinet and follow the troubleshooting instructions.

"Track skipping and/or no TOC (Table Of Contents) may be caused by build up of dust other foreign matter on the laser pickup

lens. Before attempting any adjustment make certain that the lens is clean. If not, clean it as mentioned below."

Turn the power off.

Gently clean the lens with a lens cleaning tissue and a small amount of isopropyl alcohol.

Do not touch the lens with the bare hand.

Dust gradually accumulates on the objective lens during use, and it may degrade performance.

To avoid this problem, use a cleaning disc designed for CD optical pickup lenses.

Check the pickup-in switch (SW702) position.

Check the Focus system.

Yes

• The CD function will not work.

The CD operating keys don't work.

Check the power supply, 16.93 MHz clock, and reset terminal.

Yes

QT-CD250

– 18 –

• Laser failure.

Yes No Check the laser come on when pattern cut between pin 8 (SEL) of

IC801 and pin 74 (SEL) of IC802.

Yes No Check the peripheral parts of IC801 and Q801. If it is normal, the

optical pickup is faulty.

Check BI801/CNS801. If it is normal, the optical pickup is

faulty.

Is approx. 1.8V applied to the collector of Q801.

• Focus failure.

Does the optical pickup move up and down when the disc is

removed?

Is the following waveform ouput at the pin 62 (FEI) of IC802

when the disc is set?

Is the waveform shown above input at the pin 63 (SBAD) of

IC802?

Yes

The optical pickup is faulty.

Check as stated in item "FOCUS SERVO SAWTOOTH WAVE

FAILURE".

Yes

Check the periphery of IC801 and BI801/CNS801. Is it normal?

No Check the pattern between pin 13 of IC801 and pin 63 of IC802.

Check the periphery of IC801 and BI801/CNS801.

IC801 is faulty.

Yes

Is +7.5V applied to the Collector of Q206 ?

Is +5V applied to the collector of Q204 and Q806 ?

Yes No

Check the PWB pattern of Q206.

Check the PWB Patten of IC204 and Q806.

Is +5V applied to the pin 75 (VDD) and pin 96 (MVDD) of

IC802 ?

Is +5V applied to the pin 1 (VCC) of IC801 ?

Yes

Check the PWB pattern between collector of Q806 and pin 75 of

IC802, and emiter of Q806 and Q804 and pin 96 of IC802.

Check the PWB pattern between collector of Q204 and pin 1 of

IC801.

pin 62

(FEI)

pin 86

(FOO)

pin 63

(SBAD)

Yes

Is +0V applied to the pin 74 (SEL) of IC802 ?

QT-CD250

– 19 –

• Focus servo sawtooth wave failure.

Is +7.5V applied to the pins 1 and 30 (VCC) of IC803 ?

Is sawtooh wave output to the pin 66 (FOO) of IC802 ? IC802 is faulty.

Yes

Is sawtooth wave obtained between pins 20 and 21 of IC803 ? No Check the PWB pattern of IC803.

Check the PWB pattern of IC803.

Is sawtooth wave obtained between pins 3 and 4 of BI801/

CNS801 ? (as shown above)

Yes

Check the PWB pattern between BI801/CNS801 and IC803.

BI801/CNS801 connection failure or optical pickup failure.

Yes

• Spindle motor clv servo failure.

Is above wave obtained between pins 5 and 6 of IC803 ?

Is following wave output to the pin 72 (DMO) of IC802 when

the Function is changed to "PLAY" from "STOP" ? No

Yes

Check the procedure in "HF ERROR".

If OK. IC802 is faulty.

Check the PWB pattern between pin 72 (DMO) of IC802 and pins

5 and 6 of IC803. If OK. IC803 is faulty.

Is above wave obtained between pins 5 and 6 of BI803/

CNS803 ?

Yes

Check the PWB pattern between BI803/CNS803 and IC803.

BI803/CNS803 connection failure or optical pickup failure.

Yes

DMO

1.5~2.5sec

QT-CD250

– 20 –

• Sled motor operation failure.

Yes

Is following sled feed signal output the pin 71 (FMO) of IC802

when FF/REW key is pressed after the CD TEST MODE is

seted?

Is sled feed signal output the pins 10 and 11 of IC803?

Is sled feed voltage applied between both terminals of sled

motor?

Check the peripheral parts of IC803. If OK, IC803 is faulty.

IC802 is faulty.

Check the BI803/CNS803.

Yes

Check the CD mechanism (periphery of sled motor).

If the sled motor does not run when DC2.0V is applied to

both terminals of sled motor, the sled motor is faulty.

• Sled servo failure.

Yes

Is following sled signal output the pin 71 (FMO) of IC802

during playback?

Normal.

No IC802 is faulty.

• Track search failure

Does the sled motor run in FF/REW state when the CD

TEST MODE is set?

Is the following wave output to the pin 67 (TRO) of IC802

during track search in normal playback?

Is the following wave output to the pins 12 (TEO) of IC801

during track search in normal playback?

Yes

No Check as stated in item "SLED MOTOR OPERATION FAILURE".

No IC802 failure.

No Check the PWB pattern between pin 67 (TRO) of IC802 and pin

28 of IC803.

Check the PWB pattern between pins 25 and 26 of IC803 and

Optical pickup.

If OK. Optical pickup failure.

Yes

Is the above wave output to the pins 64 (TEI) and 65 (TEZI)

of IC802 during track serch in normal playback? No Check the PWB pattern between pin 12 (TEO) of IC801 and pins 64

(TEI) and 65 (TEZI) of IC802. If OK. IC801 failure.

Normal.

Yes

Is following sled feed signal input the pins 12 and 13 of IC803

when FF/REW key is pressed after the CD TEST MODE is

seted?

Check the PWB pattern between pin 71 of IC802 and pins 12 and

13 of IC803.

Is the following wave output to the pin 60 (RFZI) and 61

(RFRP) of IC802 during track search in normal playback? No Check the PWB pattern between pin 22 (RFO) and 18 (RFIS), 17

(RFRP) of IC801 and pins 60 and 61 of IC802. If OK. IC801 failure.

Yes

TRO

TEO

TEI

TEZI

FF REW

FMO

RFRP

RFZI

FF REW

SL ±

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