Sharp Qt-cd111 User manual

QT-CD111/111C

– 1 –

Illustration: QT-CD111

CONTENTS Page

IMPORTANT SERVICE NOTES (FOR QT-CD111 ONLY)................................................................................................ 2

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

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

DISASSEMBLY.................................................................................................................................................................. 4

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

ADJUSTMENT ................................................................................................................................................................... 6

BLOCK DIAGRAM ............................................................................................................................................................. 8

SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD............................................................................................. 10

NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 16

TYPES OF TRANSISTOR ............................................................................................................................................... 16

WAVEFORMS OF CD CIRCUIT...................................................................................................................................... 17

TROUBLESHOOTING (CD SECTION) ........................................................................................................................... 18

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

PARTS GUIDE/EXPLODED VIEW

PACKING OF THE SET (FOR QT-CD111 ONLY)

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

originalconditionandonlypartsidenticaltothosespecifiedshould

be used.

QT-CD111

QT-CD111C

SERVICE MANUAL

SHARP CORPORATION

No. S3819QTCD111/

This document has been published to be used

for after sales service only.

The contents are subject to change without notice.

QT-CD111/111C

– 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 QT-CD111 ONLY)

AllcheckmustberepeatedwiththeAClinecordplugconnection

reversed.

Anyreadingof0.3voltRMS(thiscorrespondsto0.2milliamp.

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

hazard which must be corrected before returning the audio

product to the owner.

TO EXPOSED

METAL PARTS

CONNECT TO

KNOWN EARTH

GROUND

TEST PROBE

0.15 µ F

1.5k ohms

10W

VTVM

AC SCALE

SPECIFICATIONS

General

Power source: AC 120V, 60 Hz

DC 12 V [ "D" size (UM/SUM-1,

R20 or HP-2) battery x 8]

Power consumption: 20 W

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

(111) into8 ohms from150 Hz to20 kHz,

withno morethan 10% totalharm-

onic distortion.

RMS; 2.3 W (1.65 W + 1.65 W)

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

Output power: RMS; 2.3 W/CH

(111C) (DC operation, 10 % T.H.D.)

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

Dimensions: Width; 18-15/16" (480 mm)

Height; 6-1/16" (153 mm)

Depth; 10" (254 mm)

Weight: 7.1 Ibs. (3.2 kg) without batteries

Radio

Frequency range: FM; 87.6 - 108 MHz

AM; 530 - 1,702 kHz

Tape recorder

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

Signal/noise ratio: 50 dB

Wow and flitter: 0.25 % (WRMS)

Motor: DC 12 V electric governor

Bias system: AC bias

Erase system: Magnet erase

Compact disc player

Disc: Compact disc

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

conductor laser pickup

Audio channels: 2

Quantization: 16-bit linear quantization

Filter: 4-tims oversampling digital filter

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

Wow and flutter: Unmeasurable

(less than 0.001% W. peak)

Specifications for this model are subject to change without

prior notice.

QT-CD111/111C

– 3 –

NAMES OF PARTS

1. Cassette Compartment

2. CD Compartment

3. Tuning Control

4. (TAPE) Record Button:

5. (TAPE) Play Button:

6. (TAPE) Rewind Button:

7. (TAPE) Fast Forward Button:

8. (TAPE) Stop/Eject Button:

9. (TAPE) Pause Button:

456789

10 11

13 14 15 16 17 18 19

21 22

10. (CD) Play Indicator:

11. (CD) Track Number Indicator

12. (CD) Repeat Indicator:

13. Volume Control

14. Function Selector/Power Switch

15. Extra Bass Button: X-BASS

16. (CD) Track Down/Review Button:

17. (CD) Track Up/Cue Button:

18. (CD) Stop Button:

19. (CD) Play/Repeat Button:

20. FM Telescopic Rod Aerial

21. Battery Compartment

22. AC Power Input Socket

QT-CD111/111C

– 4 –

1 Rear Cabinet 1. Screw ................. (A1) x10 4-1

2. Socket .................. (A2) x1 4-2

2 Top Cabinet 1. Knob..................... (B1) x1 4-2

(with CD Mechanism/

2. Screw ................... (B2) x3

Tape Mechanism/ 3. Socket .................. (B3) x1

Main PWB)

3 Main PWB/ 1. Screw ................... (C1) x6 4-3

Switch PWB 2. Socket .................. (C2) x4 4-3,4-4

4 Tape Mechanism 1. Screw ................... (D1) x4 4-4

5 CD Mechanism 1. Screw ................... (E1) x3 4-4

6 Terminal PWB 1. Screw ................... (F1) x4 4-5

2. Hook..................... (F2) x1

DISASSEMBLY

Caution on Disassembly

Follow the below-mentioned notes when disassembling 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 be

removedwhendisassemblingtheunit.Afterservicingthe

unit, be sure to rearrange the leads where they were

before disassembling.

4. Take suffcient care on static electricity of integrated

circuits and other circuits when servicing.

STEP REMOVAL PROCEDURE FIGURE

Figure 4-4

Figure 4-3

Figure 4-5

Figure 4-1

(A1)x3

ø3x12mm

(A1)x1

ø3x12mm

(A1)x6

ø3x20mm

Rear Cabinet

Front Cabinet

(B2)x3

ø3x10mm (A2)x1 (B3)x1 Front Cabinet

Top Cabinet (B1)x1

Main PWB

(C1)x5

ø3x10mm

(C2)x1

Switch PWB

(C1)x1

ø3x10mm

Main PWB

Top Cabinet

Figure 4-2

Top Cabinet

Tape

Mechanism

CD Mechanism

(E1)x3

ø2.5x10mm

(D1)x4

ø3x10mm

(C2)x2

(C2)x1

(F1)x2

ø3x10mm

(F1)x2

ø3x10mm

Terminal PWB

Driver

Push

(F2)x1

QT-CD111/111C

– 5 –

CD MECHANISM SECTION

Perform steps 1, 2, 3 and 5 of the disassembly method to

remove the CD mechanism.

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

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.

Figure 5

REMOVING AND REINSTALLINGTHE MAIN PARTS

(A1) x2

2.6 x6mm

Stop

Washer

(A3) x1

Mechanism

Gear

(A4) x1

Shaft

(A2) x1

Pickup

QT-CD111/111C

– 6 –

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 In motor 3,000 ±90 Hz Output: Speaker

Teaminal

(CNP201 Load

resistance: 8 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 1.8 V ±3 dB Speaker Terminal

(Load resistance: 8 ohms)

Specified Value

ADJUSTMENT

TUNER SECTION

fL: Low-range frequency

fH: High-range frequency

• FM IF/RF

IF T1

Detection T2

Band Coverage fL: L2

fH: TC2

Tracking 88.0 MHz: L1

108.0 MHz: TC1

Test Stage Specified

Value/Adjusting

Point

Instrument

Connection

Input: Pin 1 of IC1

Output: Pin 17 of IC2

Iuput: Antenna

Output: Speaker

Terminal (CNP201

Load resistance: 8

ohms)

• AM IF/RF

IF T3 Input: Antenna

Output: Pin 19 of IC2

Band Coverage fL: L4 Input: Antenna

fH: TC4 Output: Speaker

Tracking 600 kHz: L3 Terminal (CNP201

1,400 kHz: TC3 Load resistance: 8

ohms)

Test Stage Specified

Value/Adjusting

Point

Instrument

Connection

• VCO Frequency

Specified

Value Instrument

Connection

VR1 76 kHz ±200 Hz Pin 13, pin 21 and

ground of IC2

Adjusting Point

Note:

After preparing the test circuit shown in Fig. 6-1, connect the

Pin 13, Pin 21 and ground of the IC2 with the test circuit, and

measurethevalue.At thistime,applyastandardunmodulated

signal input and adjust the VCO.

Pin 13 of IC2 Pin 21 of IC2

10 kohm

TO FREQUENCY

COUNTER

FET : 2SK19 or 2SK54

Figure 6-1 VCO FREQUENCY TEST CIRCUIT

Figure 6-2 ADJUSTMENT POINTS

• Head Azimuth

Torque Meter Specified Value

MTT-114 Output: Speaker Terminal

(CNP201 Load resistance: 8 ohms)

Adjusting

Point

Specified Value Instrument

Connection

L301 82 kHz ±6 kHz Pin 2 of CNP201

– 6 kHz

TRACKING

DETECTION

VCO

VR1

IC2

IC1 T1

FM IF

AM IF

TC4 TC2

TC1

TC3

TRACKING

AM BAND

COVERAGE FM

TRACKING FM BAND

COVERAGE

fH fL fH fL fH fL

AM BAR ANTENNA

FM ROD ATENNA

MAIN PWB

QT-CD111/111C

– 7 –

CD SECTION

Since this CD system incorporates the following automatic

adjustmentfunction,whenthepickupisreplaced,itisnecessary

to reajust it.

Sincethis CD unitdoesnotneedadjustment,thecombination

of PWB and laser pickup unit is not restricted.

TEST MODE

While holding down the "STOP" button, move the FUNCTION/POWER switch to "CD".

Then, release the "STOP" button and, within 0.5 second, connect the TEST POINT to GND (within 0.5 second).

(See Fig. 7)

Start

Note 1. When the CD LID switch is in the OFF position, the unit will be able to enter the test mode.

However, playback cannot be performed in this mode.

2. You can only move the pickup.

3. The LCD display should be the same as it is for normal CD operations.

2When the "PLAY" button is pressed, the laser will be lit, and when the "STOP" button is pressed, it will be

turned off. Playback will also start and stop when these buttons are pressed.

Turning the tracking servo on or off.

a. If the "PLAY" button is pressed while in the stop mode, the laser will simply be turned on at first.

b. If the laser is lit and the "PLAY" button is pressed again, playback will start from the current pickup position.

c. If the "STOP" button is pressed, playback will stop. When pressed again, the laser will be turned off.

a. Each time the PAUSE button is pressed during playback, the tracking servo will be turned on or off.

(Note: If the PLAY button is pressed while in the stop mode, the tracking servo will automatically be

turned on.)

Operation The use of the "UP/CUE" button will move the pickup to the outermost position.

The use of the "DOWN/REVIEW" button will move the pickup to the innermost position.

While holding down the "STOP" button, move the FUNCTION/POWER switch to "CD".

Then, release the "STOP" button and, within 0.5 second, press the REVIEW/DOWN button.

Start

Display

LCD MODE

*Afterthenumber

hasappearedinthedisplay,eachtimethe"UP/CUE"buttonispressed,thedisplaywillswitch

in the following order:

, and then

1 second1 second

Figure 7

SW774

TRACK DOWN/

REVIEW

R771

3.9K

TEST

POINT

R772

2.7K

R773

1.8K

R774

1.5K

R776

10K

SW773

TRACK UP/

CUE

SW771

PLAY

SW7712

STOP

TO CD SECTION

SWITCH PWB – A2

QT-CD111/111C

– 8 –

Figure 8 BLOCK DIAGRAM (1/2)

+5V

FOCUS COIL

TRACKING COIL

PICKUP UNIT

310 19 23 25

49 50 52 5351 54

Q804

+5V

161 58 57

CL, DAT, SELIAL CONTROL

CONSTANT

VOLTAGE

REGULATOR

16 27

MOTOR

SLIDE

MOTOR

SPIN

9~~ 1714

XIN

XOUT

OPERATION

KEY

SW771~SW774

RC IN

LID

SW761

OPEN/CLOSE

SENSOR

REMOTE

RX771

60 41 44 30 33 22 23

CD LCD

LCD701

PICKUP IN

PU-IN SW

SL+

SL–

+7.4V

(CD)

GND (A)

R-CH

L-CH

GND (D)

POWER GND

+7.4V (D) SECTION

MAIN

VVDD

XIN

XOUT

VDD

XVDD

EFMO

EFMIN

CLV+

CLV–

V/P

HFL

TES

TOFF

JP–

JP+

TGL

RES. CQCK. COIN

SQOUT. RWC. WRQ

LCHO

LC78622E

IC802

SERVO/SIGNAL

CONTROL

16.93MHz

XL801

SLI

SLC

CV+

JP–

DRF

DAT

CLK

THLD/DEF

SLD

SLEO

SPO

SL+

SL–

FIN1

FIN2 64 62

+5V

Q805

VCC1

LDO

LASER

DRIVER

SERVO AMP.

LA9240M

IC801

22 2+7.4V

26 13

IC804

BA5914FP

FOCUS/TRACKING

/SPIN/SLIDE

DRIVER

M701

M702

SW702

RES

SL–

DRF

WRQ

RESET

VLC3

VDD

+5V

(D)

4MHz

X701

IC701

IX0105AW

SYSTEM

MICROCOMPUTER

COM0

SEG1

SEG4

COM3

CD LID

QT-CD111/111C

– 9 –

Figure 9 BLOCK DIAGRAM (2/2)

13 14

FM ROD ANTENNA

F1

B.P.F

L1

FM RF

L3

AM BAR ANT.

L2

FM OSC

OSCMIX

VCC

RF AMP

IC1

LA1186N

FM FRONT END

FM

T1

FM IF CF

10.7MHz

IC2

LA1805

FM / AM

IF MPX.

AM IF

T3 CP T2

FM DET

455kHz

L5

AM OSC

AM / FM

SELECT

VR1

VCO TUNER

IC501

LA4597

POWER AMP.

VOLUME

X-BASS

SW202

A,B VR201

A,B

STANBY

IC203

KIA7808P

VOLTAGE

REGULATOR

+B2

+B1

SP501

L-CH

SPEAKERS

SP502

R-CH

SO651

SW201-C

POWER/

FUNCTION

AM / FM

SELECT

FM +B

SW201-D

POWER /

FUNCTION

RADIO

TAPE

REC

POWER/

FUNCTION

SW201-A,B

EC / PB

SW102

A,F

P. B

REC

IC101

EQULIZER

AMP.

BA331IL

REC

P.B

P.B P.B

SW102

REC / PB

B.D

REC / PB

SW102

C,E

L-CH

REC / PB

HEAD

R-CH

(AUDIO GND)

+7.4V

+B2

(DIGITAL GND)

(POWER GND)

FROM

CD

SECTION

R-CH

ERASE

HEAD SW102-H

REC / PB BIAS

OSC.

C201

L201 SW102-G

REC / PB

+B1 M601

TAPE

MOTOR SW601

MAIN

D651~D654

RECTIFIER

TUNER

T651

POWER

TRANSFORMER

BATTERY

DC12V

[' D' SIZE (UM/SUM-1,

R20 or HP-2)BATTERYx8]

AC INPUT

AC 120V

60Hz

REG. OSC

RF MPX

FM - IF DET. POST

AMP.

MUTE

TU

DRIV.

AGC

GND

AM - IF DET.

LEVEL - DBT.

PILOT

DET. TRIG. ST.

DRIV.

VCC

FFFF

VCO

ST.

SWIT.

DECODER

PHASE

DET.

L-CH

QT-CD111/111C

– 10 –

1234 5 6

• The numbers 1 to 12 are waveform numbers shown in page 17.

Figure 10 SCHEMATIC DIAGRAM (1/4)

LCD701

12345678

FW701

IC701

IX0105AW

SYSTEM

MICROCOMPUTER

R822

6.8K

IC801

LA9241M

SERVO AMP.

C835 0.1/50

C837 10/16

C838 0.01

C839 1/50

C840 0.33/50

R803

15K

R802

100K

C805

0.033

R804

2.2K

C804

0.001

R808

12K C810

180P

R809

27K

R807

1K C809

0.047

R811

3.3K

C808

0.068

R805

6.8K

C806

0.033

C807

0.1/50 R806

100

C803

0.1/50

R833

5.6K

C830

2P

(CH)

C833

0.001

C834

0.033

R832

56K

R828

R839

22K

R840

22K

C813

0.1

R812

15K

R829

R814

10K

R815

47K

C812

330P

R816

1.5K

C814

0.01

R813

33K

R820

10K

R819

39K

R817

82K

C815

0.0047

R821

56K C816

0.001

R830

R824

10K

C818

1/50 C819

47/16

R825

1.2K R826

220K C820

0.0033

R827

220K

C817

0.47/50

R823

1.2K

C811

0.1

R709

R710

10K

R711

2.7K

C704

100/10

C705

0.022

R713

R736

C702

0.022

R708

R716 10K

R718 15K

R720 15K

R722 15K

R719 15K

R723 15K

R725 15K

R734

1K R730

R721 15K

R724 15K

R727

R726 1K

R728 1K

R729 1K

R731 1K

R732 1K

R733 1K

X701

4MHz

R745

10K D741

1N4148

R744

10K C741

3.3/50

R742

R743

100K

R740

4.7K

R741

3.3K

D740

1N4148

Q740

2SC1815 GR

C740

0.01

R714

10K

R715

15K

C701

0.022

R831

Q805

SS9012H

C849

0.022

R842

C848

1/50

C845

4.7/50

R871

4.7K

R772

2.7K R771

3.9K

R773

2.7K

SW772

STOP

SW771

PLAY/

REPEAT

SW774

TRACK DOWN/

REVIEW

10K

R776

R774

2.7K

SW773

TRACK UP/ CUE

SW761

CD LID

OPEN/CLOSE

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

13121110

4321

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

5354

5859



+B +B

RES

CQCK

CO IN

RWC

SL+

SL–

DRF

SQOUT

WRQ

PU IN

DIGITAL GND

SEG12

SEG11

SEG10

SEG9

SEG8

SEG7

SEG6

SEG5

SEG4

SEG3

SEG2

SEG1

SEG0

P00

P01

P02

P10

POWER IN

D1 MUTE

D4 COCK

D3 RES

D5 COIN

D6 RWC

D7 SL+

D8 SL–

DFR P20

SQOUT P21

WRQ P22

PU-IN P23

RESET

XIN

XOUT

VSS

VDD

XCOUT

XCIN

AVSS

VREF

P30

P31

P32

P33

P3P40

AIN5

SIMUKE AIN6

KIDSW AIN7

VLC3

VLC2

VLC1

COM3

COM2

COM1

COM0

SEG16

VCC1

LDS

LDD

BH1

PH1

LF2

REFI

VCC2

FSS

DRF

DAT

CLK

DEF

TBC

FSC

GND

SLI

SLC

RFS–

RFSM

CV+

CV–

SLOF

HFL

TES

TOFF

TGL

JP+

JP–

A GND

FE–

FA–

TE–

TESI

SCI

TD–

EFIN1

FIN2

FD–

SPD

SP–

SPG

SL+

SL–

SLD

SLEQ

VREF

GND

SWITCH PWB-A2

CD SIGNAL

MAIN PWB(2/2)

NO. VOLTAGE

IC701

0V

3.9V

0V

5V

4.1V

0V

0.4V

0V

5V

2.5V

0V

5V

0V

5V

4.8V

0V

3.8V

22 55

NO. VOLTAGE

5V

0V

0.4V

5V

3.1V

1.5V

2.4V

0V

NO. VOLTAGE IC801

2.5V

0V



NO. VOLTAGE PIN

NO. VOLTAGE

0V

2.5V

0V

2.4V

4.1V

4.7V

0V

5V

2.5V

0.9V

2.1V

4.2V

0V

NO. VOLTAGE IC802

0V

1.5V

0V

2V

5V

0.3V

0V

2.5V

0V

5V

0V

4.8V

5V

0V

2.5V

0V



NO. VOLTAGE PIN

NO. VOLTAGE

2V

0V

0.1V

2.2V

0V

2.5V

0V

2.5V

0V

4.1V

5V

0V

2.7V

2.4V

0V

2.5V

2.2V

0V

5V

4.8V

0V

5V

0V

1.5V

2.4V

2.5V

2.5V

5V

0V

5V

2.5V

0V

5V

4.7V

2V

0V

2V

4.7V

0V

5V

2.3V

QT-CD111/111C

– 11 –

Figure 11 SCHEMATIC DIAGRAM (2/4)

78 9101112

• NOTES ON SCHEMATIC DIAGRAM can be found on page 16.

L802

0.68µH

CNS803

BI803

SW702

PICKUP IN

M702

SLED

MOTOR

M701

SPINDLE

MOTOR

CNS801

B1801

CNS802

BI802

R833

5.6K

R835

470

C830

2P

(CH)

C833

0.001 R836

47K

C834

0.033

R832

56K C831

0.0027

R838

33K

R837

47K

C832

27P

(CH) R834

C822

220P

IC804

BA5914FP

FOCUS/TRACKING/SPIN/SLIDE DRIVER

C844

330/10

R810

82K D802

1N4148

R849

100K

C851

0.022

C821

1/50

R827



220K

C846

330/10

Q804

8050D

R877

220

C889

10/16

ZD801

MTZJ5.6B

R878

100

C887

0.022

R875

10K R876

10K

R873

100

C890

100/10

C867

10/16

R874

100

C868

10/16

XL801

16.93MHz

R880

100

C843

100/10 C873

0.01

L801

0.82µH

R860

IC802

LC78623D

SERVO/SIGNAL CONTROL

C847

0.01

0.047

C842

27K

R857

1.2K

R856

C841

0.047

C802

47/16

R801

1K C801

0.01

C870

0.0022

C869

0.0022

R858

680

C850

0.1

C845

4.7/50

R871

4.7K

654321

14 15

29 30

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

49505152535455565758596061626364



3.5V

2.5V

2.5V7.4V

7.4V

2.7V

3.8V

3.2V

3.5V

2.5V

+3.8V

-3.2V 0V

4.8V

7.4V

5.5V

AUDIO GND

POWER GND

DIGITAL GND

DIGITAL +7.4V

L-CH

R-CH

GND

FO–

FO+

TR+

TR–

MON

FO–

FO+

TR+

TR–

PU-IN

SL–

SL+

SP–

SP+

FO+

FO–

TR–

TR+

TR–

FO–

FO+

DEF

–

TEST1

TEST5

4.2M

16M

TST11

RES

CQCK

COIN

RWC

SQOUT

WRQ

FSX

SBCK

EFLG

SFSY

SBSY

XVSS

XIN

XOUT

XVDD

MUTER

RVDD

RCHO

RVSS

LVSS

LCHO

LVDD

MUTEL

TEST4

TEST3

DOUT

C2F

EMPH

CONT5

CONT4

CONT3

CONT2

CONT1

VDD

FSEQ

PCK

JP–

JP+

TGL

TOFF

TES

HFL

V/P–

CLV–

CLV+

TEST2

EMFIN

EMFO

Vss

VVDD

ISET

VVss

PDO TAI

DEFI

GND

VO4–

VO4+

VIN4

VIN4'

BIAS IN

VCC

VIN3'

VIN3

VO3+

VO3–

OP IN +

OP IN -

OP OUT

GND

VO2-

VIN1'

GND

VIN2

VIN2'

VO2+

MUTE

VO1-

VIN1

VO1+

CD MOTOR PWB-B

P12 1 - E

TO MAIN SECTION

PICKUP UNIT

VOLTAGE

2V

0V

0.1V

2.2V

0V

2.5V

0V

2.5V

0V

4.1V

5V

0V

2.7V

2.4V

0V

QT-CD111/111C

– 12 –

1234 5 6

Figure 12 SCHEMATIC DIAGRAM (3/4)

• NOTES ON SCHEMATIC DIAGRAM can be found on page 16.

R457

1.2K

R458

1.2K

CNP101

CNS101

SW102-H

SW102-C SW102-B

SW102-E SW102-D

SW102-A

SW102-

SW102-F

C354

VC3

L3

AM BAR ANT.

TC3

L4

AM OSC.

TC1

D1

1N4148

F1

B.P.F.

C2

0.001

L1

FM ANT.

C9

0.0047

C16

0.0047

R1

R7

390

R3

R9

22K

IC1

LA1186N

FM FRONT END

RF AMP.

C5

33P

(CH)

R2

C6

15P

(RH)

VC2

TC2

C8

4P

(CH)

R5

330K

C14

0.022

R6

820K

VC1

C4

22P

(CH)

C37

220/10

C39

0.022

R8

3.9K

R27

33K

C22

0.0039

C23

0.01

C38

0.022 C24

470P

C25

3.3/50 C27

3.3/50

R11

1.2K

VR1

6.8K

(B)

R29

15K

C28

0.0015

(STYROL)

R25

120

CF1

C29

10/16

R104

12K

R105

15K

C109

270P

C112

330P

C111

330P

R107

C108

820P

C107

820P

R108

C110

270P C114

47/16

R110

120

R455

15K

R456

15K

330

R101

330

R102

C35

1/50

SW201-B

R103

12K

C352

220/16

C353

0.022

(ML)

R351

330

150

R352

L301

C351

0.0022

(ML)

C105

1800P

R106

15K

C106

1800P

R123

3.3K

R124

3.3K

(P.P)

220P

C11

C10

0.022

C15

0.022

IC2

LA1805

VC4

TC4

C46

C17

0.022

C21

0.022

C20

0.022

T3 CF2

C26

22/16

SW201-A

R16

2.2K

R13

3.9K R14

3.9K

R15

2.2K

C33

1/50 C34

1/50

R38

1.8K

0.022

C32

C31

0.022

R17

C36

0.022

R121

1.5K

D103

1N4148

R122

1.5K

C123

100/10

C121

0.01

C122

0.01

D101

1N4148

D102

1N4148

R120

3.3K

R119

3.3K

C119

2.2/50

C120

47/16

R125

680K

R118

3.9K

C115

0.018

C117

10/16

R117

3.9K

R115

3.9K

R113

8.2K

C118

10/16

R116

3.9K

R114

8.2K

IC101

BA3311L

REC./P.B.

EQUALIZER AMP.

C113

47/16

(ML)

C116

0.018

(ML)

R109

120

123

23 4

123 45

8910 11

131415161718192021222024



TAPE

RECORD/PLAYBACK

HEAD

VCO

OSC

MIX

AUTO

FM BAND

COVERAGE

AM

TRACKING

AM BAND

COVERAGE

fH fL

fHfL

FM

TRACKING

FM DET

FM OSC.

FM IF

ALC T

FILTER

VCC

GND

NF1

NF2

IN2

IN1

OUT2

OUT1

AM

OSC

STB

AM RF

FM

DET

AM

OUT

AM IN

MPX

MO/ST

VCO

AM/FM

GND

AM

AGC

AM

MIX

FM

IF IN

R-CH

L-CH

TAPE

POWER GND

DIGITAL GND

CD +7.4V

L-CH

AUDIO GND

R-CH

AM IF

MPX VCO

CK 76kHz

TAPE

L-CH

R-CH

ERASE HEAD

ROD ANTENA

PRE AMP

DET

OUT

P11 7 - H

TO CD SERVO/

DISPLAY SECTION

46712

FM/AF IF MPX.

NO. VOLTAGE

IC1

0.9V

1.6V

6.8V

0V

6.8V

1.4V

6.2V

6.8V

NO. VOL

1.6V

6V (

0.2V

1.6V

0V

2.5V

5.1V

0.8V

QT-CD111/111C

– 13 –

78 9101112

Figure 13 SCHEMATIC DIAGRAM (4/4)

11.83V

<3V>

<0.7V>

<0.1V>

SW102-G

C354

0.022

(ML)

CNP201

CNS201

SW202-A

SW202-B

1N4148

D309 1N4148

D308

C302

0.022

C301

0.022

IC203

KIA7808P

VOLTAGE REGULATOR

VR201-A

20K (B)

VR201-B

20K(B)

C218

0.0039

R220

3.3K

C217

0.0039

R219

3.3K

C352

220/16

Q351

C8050D



R354

47K

R353

C353

0.022

(ML)

R351

330

150

R352

C221

0.001

C223

100/10

C229

100/10

C233

470/10

C227

3300/25

C226

0.022

D201

1N4148

IC202

LA4597

POWER AMP.

C222

0.001

C225

220/25

C224

100/10

R215

2.2K

R216

2.2K

R217

22K

R218

22K

C213

0.039

(ML)

C214

0.039

(ML)

C230

100/10

SW201-D

C234

470/10

C232

0.1

(ML)

C231

0.1

(ML)

SW201-C

SP502

SP501

M601

SW601

R230

2.7

C654

0.022 C651

0.022

D651

1N4004

D652

1N4004

C652

0.022

C653

0.022

D654

1N4004

D653

1N4004

T601

POWER TRANSFOMER

SO651

CNP602

CNS602

R222

R221

C219

0.047

(ML)

C220

0.047

(ML)

C216

0.039(ML)

C215

0.039

(ML)



BATTERYS

DC12V["D"size(UM/SUM-1,

R20 or HP2)battery x 8]

R-CH L-CH

SPEAKERS

–

VOLUME

(241-7)

MAIN

(241-6)

TAPE

MOTOR

TERMINAL PWB-A3

X-BASS

TAPE

FM AUTO

TAPE

–

OUT IN

X VCO

76kHz

AC INPUT

MAIN PWB-A1(1/2)

RECORD SIGNAL

PLAYBACK SIGNAL

CD SIGNAL

FM SIGNAL

AM SIGNAL

NO. VOLTAGEIC2

1.6V

6V (6.3V)

0.2V (0.7V)

1.6V

0V

2.5V

5.1V (6.6V)

0.8V (1V)

NO. VOLTAGE

1.2V (0V)

1.9V (1.6V)

1V (1.3V)

1.7V

1.5V (1.7V)

1.5V (1.5V)

0.4V (0.4V)

6.1V (6.4V)

1.6V

1.6V

( ): AM

< >: Recording

[ ]: Play

NO. VOLTAGE

IC101

<0V> [3.23V]

<0V> [0V]

<0.6V> [0.6V]

<0V> [0V]

<7.43V> [7.43V]

<0V> [0V]

<7.37V> [7.37V]

<0.6V> [0.6V]

<3.3V> [3.3V]

NO. VOLTAGE

IC202

0.1V

0V

11.2V

0V

11.3V

0V

0.1V

12V

10.4V

5.8V

0V

5.8V

10.4V

QT-CD111/111C

– 14 –

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

1234 5 6

• The numbers 1 to 12 are waveform numbers shown in page 17.

910

11 12

BK

WH

BR

GY

BR

BK

VOLUME

SW203

X-BASS

SW201

FUNCTION

FM AUTO AM TAPE

OFF

POWER

3

2

1 2 3

1

2

L3

AM BAR ANTENNA

TC1 TC2

TC3 TC4

VC4

VC3

VC2

VC1

C108

C110

C848

C844

C843

C867

C873

C889

C846 C819

C817

C818

C231

C229

C120

C119

C123

C234

C122

C118

C114

C112

C111

C109

C113

C107

C116

C106

C352

C354

C105

C117

C222

C221

C220

C219

C223 C224

C704

C216

X701

XL801

C868

C890

C213

C214

C217

C218

C226

C233

C232

C887

C215

Q804

Q351

C820

C869

C870

C705

C301

C302

C121

C230

C225

C701

C702

C115

C351

C353

R102

R108

R110

R840

R810

R877

R878

R824

R825

R124

D103

R118

R109

R101

R107

R116

R105

D101

R117

R458

L802

R874

R216

R215

R217

R218

R222

R221

R123

R119

R842

R830

R714

R219

R115

R121

R113

R776

R772

R773

R774

L801

ZD801

R230

R457

R456

R455

R708

R715

R736 R724

R727

D201

R771

R822

R823

R839

R831

R873

R880

R875

R876

R713

R709

R711

R710

R220

R351

D102

R125

R104

R103

R120

R114

R106

R354

E

C

R353

R352

R122

IC802

SW102

CNP101

IC101

IC202

FW701

CNP201

LCD701

12345678

BI801

C227

L301

CNP602

IC203

SW774 SW773

SW772

STOP

SW771

PLAY

VR201

15 21 22 28

IC804

C807 C35

C27

C34

C15 C14

C29

C11

C36

C22

C24

C25

C23

C37

C33

C32

C17 C20

C26

C21

C837

C845

C850

C840

C802

C801

C803

C804

C806

C814

C812

C816

C832

C741

Q740

Q805

E C B

CF1

C38

C10

C39

C28

C31

C16

C838

C839

C847

C841 C833

C851

C810

C815

C811

C849 C809

C808

C813

C805

C831

C830

C822

C740

C834

C842 C835

C821

R808

R811

R809

R829 R806

R807 R15

R13

R16

R14

R11

R29

R27

R1 R2

R802

R871

R801

R805

R827

R826

R814

R817

R832

R833

R745

R744

D741

R743

R25

R38

D308

D309

R721

R730

R734

R17

R849

R836

R838

R857

R856

R816

R834

R835

R837

R803

R804

R812

R813

R815

R828

R819

R820

R821

R858

R860

D740

R740

R741

R742

R725

R716

R718

R733

R719

R732

R720

R731

R722

R729

R723

R728

R726

D802

IC801

FW701

CNS802

BI802

IC2

VR1

BI803

CNS803

IC701

IC1

CF2

2345 123456

E

C

B

C

49 50

MAIN PWB-A1

CD LID

OPEN/CLOSE

SW761

SWITCH PWB-A2

CNS801

12345678

123 1234

P.B REC

64 1

33 32

49 50

64 1

33 32

TRACK UP/CUE

TRACK DOWN/

REVIEW

49 50

64 1

33 32

VCO

QT-CD111/111C

– 15 –

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

78 9101112

F3895AF

C653

C651

C654

C652

D652

D653

D654

D651 CNS602

SPEKERS

SP502 SP501

L-CHR-CH

FM ROD ANTENNA(213)

RECORD/PLAYBACK

HEAD(241-4)

ERASE HEAD

(241-5)

TAPE

CNS101

COLOR TABLE

RD(R)

WH(W)

BROWN

RED

ORANGE

YELLOW

GREEN

BLUE

VIOLET

GRAY

WHITE

BLACK

PINK

T601

POWER

TRANSFORMER

(236)

(211)

BATTERYS

DC12V["D"SIZE(UM/SUM-1,

R20 or HP2)battery 8]

TAPE MOTOR

(241-6)

M601

TAPE MAIN

(241-7)

SW601

CNS201

1

2

WH

BK

2

SPENDLE MOTOR

PICKUP IN

M701

SLED MOTOR

M702

CNP803

SW702

54321

78 654321

PICK UP UNIT

CD MOTOR PWB-B

TERMINAL PWB-A3

SO651

AC SOCKET

AC 120V

60Hz

QT-CD111/111C

– 16 –

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

•The indicated voltagein eachsection is theone measured by

Digital Multimeter between such a section and the chassis

with no signal given.

SW102 RECODE/PLAYBACK OFF—ON

SW201 FUNCTION/POWER TAPE—AM—

FM AUTO—CD/

OFF—ON

SW203 X-BASS OFF—ON

SW601 TAPE MAIN OFF—ON

SW702 PICKUP IN OFF—ON

REF. NO DESCRIPTION POSITION

SW761 CD LID OPEN/CLOSE OFF—ON

SW771 PLAY/REPEAT OFF—ON

SW772 STOP OFF—ON

SW773 TRACK UP/CUE OFF—ON

SW774 TRACK DOWN/REVIEW OFF—ON

Figure 16 TYPES OF TRANSISTOR

REF. NO DESCRIPTION POSITION

ECB

(S)(G)(D)

(1) (2) (3)

FRONT

VIEW

2SC1815 GR

QT-CD111/111C

– 17 –

WAVEFORMS OF CD CIRCUIT

5ms

0.50 V

IC801 20 F.E

5ms

5.0 V

IC801 54 DRF

STOP PLAY

FOCUS SERCH

0.5ms

1.00 V

0.5ms

5.0 V

HFL

0.5ms

5.0 V

TES

CUE

0.5ms

1.00 V

H.F

0.5ms

5.0 V

HFL

0.5ms

5.0 V

TES

REVIEW

0.5ms

10.0 V

JP+

0.5ms

10.0 V

JP-

0.5ms

0.50 V

0.5ms

1.00 V

50ms

10.0 V

JP+

CUE

50ms

10.0 V

JP-

50ms

0.50 V

50ms

1.00 V

REVIEW

50ms

10.0 V

JP+

50ms

10.0 V

JP-

50ms

0.50 V

50ms

1.00 V

0.5ms

10.0 V

JP+

0.5ms

10.0 V

JP-

0.5ms

0.50 V

0.5ms

1.00 V

PLAY

20ms

1.00 V

SPO NORMAL DISC

TN0=01

20ms

2.00 V

CLV+

PLAY

TCD-712 (140mm)

TN0=01

50ms

1.00 V

SPO

50ms

2.00 V

CLV+

PLAY

TCD-712

100mV

SLD

0.5s

100mV

SLD

QT-CD111/111C

– 18 –

TROUBLESHOOTING (CD SECTION)

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

the objective lens,and check the playback operation.When this section does not operate even after the above step is taken,check

the following items.

Remove the cabinet and follow the troubleshooting instructions.

"Trackskippingand/ornoTOC(TableOfContents)maybecausedbybuildupofdustotherforeignmatteronthelaserpickuplens.

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.

See if the pick-up is in the pick-up in SW702 position.

If the items mentioned above are OK, check the main

microcomputer IC701.

Yes

• The CD function will not work.

The CD operating keys don't work.

Check the CD, DPS microcomputer (IC701), power supply, 4.19

MHz and 16.93 MHz clock, and reset terminal.

Check the waveform of SCK, SO (DATA) and SI (COMM).

Yes

Playback can be performed without a disc.

Yes

Doesthe outputwaveform of IC801(16)(FD)match thatshown in

Fig. 18? Check the area around IC804-BI801/CNS801.

Yes

Check the IC801(50)(CLK) line, 4MHz.

Check the microcomputer data on pins (51)(CL), (52)(DAT) and

(53)CE.

Figure 18

• The CD operating keys work.

Yes

Does the pick-up move up and down twice? Focus search OK.

Focus search

is performed

two times

when play

operation is

done without

disc.

0.5s

0.50 V

IC801 16 FD

0.5s

0.50 V

IC801 15 TD

Check the Focus - HF system.

QT-CD111/111C

– 19 –

Check the laser diode driver.

• Playbackcanonlybeperformedwhen a disc

is loaded.

Does the DRF signal change from "L" to "H"? No If the disc is not turning, the DRF

should not change to "H".

Is HF waveform normal (see the Fig. 19-1, 2)?

Yes

Is the Focus servo active? (Can you hear it working?) No Check the area around IC801(16) - (21) (focus servo circuit).

Level is abnormal. Check the periphery

of IC801 pins 41 and

42.

Waveform is unstable. Check the spin

system.

Yes

Figure 19-2

Figure 19-1

Check the spin

system.

0.1V/DIV

0.5µsec/DIV(DC)

(When playing

back the disc)

Waveform in case

of normal play-

back

0.5s

1.00 V

IC801 16 FD

0.5s

10.0 V

IC801 12 CLV+

0.5s

10.0 V

IC801 54 DRF

0.5s

2.00 V

IC801 7 TE

Check the tracking system.

▼

• Check the tracking system.

Check waveform of IC801 pin 7 (TE).

Check the periphery of IC801

pin 8 to pin 15, and IC804 to

BI801/CNS801.

Tracking servo is inoperative.

The waveform shown in Fig. 19-3

appears, and no-disc state appears

soon. Yes

Yes

Yes Yes

Play is possible in

TEST mode. Although IL is possible,

play is impossible. Normal jump is impeded, and the

program top cannot be reached. Check the periphery of

IC801 pin 14.

Yes

Data cannot be read. Check the VCO-PLL system.

Yes

5ms

1.00 V

IC801 7 TE

5 ms

5.0 V

IC801 54 DRF

Figure 19-3

QT-CD111/111C

– 20 –

The turntable fails to rotate or rotates at high speed. Yes Check the periphery of IC801 pins 23 to 27, pin 39 and pin 40,

IC802 pin 12 and pin 13, IC804 to BI803/CNS803.

The turntable rotates a little. Yes The spin driver circuit is normal.

Play operation is performed without disc.

• Checking the spin system.

Yes

Check the IC801 pins 43 and 44, IC802 pins 3, 5, 7, 9 and 10.

Error

Yes Check PDO waveform (Fig. 20).

• Checking the VCO-PLL system

Play operation is performed when disc exits.

Yes

Although HF waveform is normal, TOC data cannot be read.

Figure 20

0.5s

1.00 V

IC802 3 PDO

0.5s

1.00 V

IC801 16 FD

As VCO freque-

ncy is locked at

4.32 M Hz,

voltage of PDO

rises and stabili-

zes.

Stop --> Play

Check IC802 pins 37and 40.

Check the periphery of IC803 (OPAMP).

Abnomal

Usually, the number of pulses of flawless disc is 100 pulses/sec

or less.

Yes

Check IC802 pin 48 (EFLG).

• Although HF waveform is normal and the time

indication is normal, no sound is emitted.

This manual suits for next models

Table of contents

Sharp QT-CD111 User manual