Sharp QT-CD210C, QT-CD210CS, QT-CD210WH, QT-CD210S, QT-CD210BL Service Manual

QT-CD210/C

– 1 –

Illustration: QT-CD210

CONTENTS

Page

IMPORTANT SERVICE NOTES (FOR QT-CD210 ONLY) ............................................................................................... 2

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

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

FITTING OF DIAL POINTER ............................................................................................................................................. 3

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

REMOVING AND REINSTALLING THE MAIN PARTS..................................................................................................... 4

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

SCHEMATIC DIAGRAM .................................................................................................................................................... 8

WIRING SIDE OF P.W.BOARD....................................................................................................................................... 10

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

TYPES OF TRANSISTOR ............................................................................................................................................... 12

WAVEFORMS OF CD CIRCUIT...................................................................................................................................... 13

TROUBLESHOOTING (CD SECTION) ........................................................................................................................... 14

FUNCTION TABLE OF IC................................................................................................................................................ 18

PARTS GUIDE/EXPLODED VIEW
PACKING OF THE SET (FOR QT-CD210 ONLY)

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

QT-CD210(BL)
QT-CD210(S)
QT-CD210(WH)
QT-CD210C(S)

SERVICE MANUAL

SHARP CORPORATION

No. SY964QTCD210/

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

QT-CD210/C

– 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
pinched or that hardware is not lodged between the chassis
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

having a return path to the chassis (antenna, metal cabinet,
screw heads, knobs and control shafts, escutcheon, etc.)
and measure the AC voltage drop across the resistor.

IMPORTANT SERVICE NOTES (FOR QT-CD210 ONLY)

All check must be repeated with the AC line cord plug connection
reversed.
Any reading of 0.3 volt RMS (this corresponds to 0.2 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 µ F

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]

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
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 semi­conductor laser pickup

Audio
channels: 2
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; 87.6 - 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

Output power: RMS; 2.3 W/CH

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

Speakers: 10 cm (4") full-range speaker x 2
Dimensions: Width; 400 mm (15-3/4")

Height; 158 mm (6-1/4")
Depth; 212 mm (8-3/8")

Weight: 2.7 kg (6.0 lbs.) without batteries

(For QT-CD210)

(For QT-CD210C)

QT-CD210/C

– 3 –

NAMES OF P ARTS

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.

Tuning Control

10.

(CD) Stop Button

11.

(CD) Track Down/Review Button

12.

Volume Control

13.

Function Selector/Power Switch

14.

(CD) Track Up/Cue Button

15.

(CD) Play/Pause Button

16.

(CD) Play Indicator

17.

(CD) Pause Indicator

18.

Battery Compartment

19.

FM Telescopic Rod Aerial

20.

AC Power Input Socket

FITTING OF DIAL POINTER

Figure 3-2

Main
PWB

Main
PWB

Dial Pointer

Drum

Dial
Pointer

Dial Pointer

Top Cabinet

Tuning
Knob

Top Cabinet

Drum

A

Top Cabinet

Drum

Variable Capacitor

B

123

456

78

9

10

15

16
17

12

13 14

11

18 19 20

Setting method of the dial pointer

1. Remove the front cabinet. (Refer to Fig.4-1 on page 4,
"Disassembly method".)

2. Remove the dial pointer.

3. Insert the dial pointer from A of the top cabinet so that it

engages with the drum gear.

4. Fully turn the drum in the opposite direction of B and set

it to the FL marks.

5. Reassemble the front cabinet.

Figure 3-1

FL Mark

Carved Seal

Mark

FH

FL

QT-CD210/C

– 4 –

1 Top Cabinet/ 1. Screw ................... (A1) x7 4-1

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

2 Power PWB 1. Screw ................... (B1) x2 4-2

2. Hook..................... (B2) x2

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

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

3 Main PWB/ 1. Socket ..................(C1) x1 4-2

CD Control PWB 2. Screw ................... (C2) x7

(Note) 3. Screw ...................(C3) x1

4. Solder................... (C4) x3

5. Socket ..................(C5) x3 4-3

6. Screw ...................(C6) x2

4 CD Mechanism 1. Screw ................... (D1) x3 4-3

5 Tape Mechanism 1. Screw ................... (E1) x4 4-3

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.

STEP REMOVAL PROCEDURE FIGURE

Figure 4-3Figure 4-1

Figure 4-2

CD MECHANISM SECTION

Perform steps 1 to 4 of the disassembly method to remove the
CD mechanism.

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

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

CD
Mechanism

Gear
(A4) x1

Shaft
(A2) x1

Pickup

(A1) x2

ø2.6 x6mm

REMOVING AND REINSTALLING THE MAIN PARTS

Figure 4-4

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

After removing the connector for the optical pickup from the

connector, wrap the conductive aluminium foil around the
front end of connector to protect the optical pickup from
electrostatic damage.

(A1)x3
ø3x12mm

Top Cabinet

Front Cabinet

(A1)x4
ø3x12mm

Main
PWB

(A2)x1

Top Cabinet

AC Socket

(B1)x2
ø3x12mm

(C2)x7
ø3x12mm

(C3)x1
ø2.5x8mm

Main PWB

Power PWB

(C4)x3

(B3)x1

(B2)x2

(B4)x2

(C1)x1

CD Lid
Switch

Power
Transformer

(D1)x3
ø2.5x10mm

(E1)x4
ø3x10mm

(C5)x1

(C5)x2

Top Cabinet

(C6)x2
ø3x8mm

Washer

CD Mechanism

CD Control
PWB

Tape
Mechanism

QT-CD210/C

– 5 –

TAPE MECHANISM SECTION

Perform steps 1 to 5 of the disassembly method to remove the
tape mechanism. (See page 4.)

How to remove the record / playback and erase
heads (See Fig. 5-1.)

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

2. Remove the hooks (A2) x 2 pcs., toward the center position

as shown in Fig. 5-1. 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. 5-2.)

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. 5-3.)

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:

When putting on the belt, ascertain that the belt is not twisted,
and clean it.

How to remove the motor
(See Figs. 5-4.)

1. Remove the mainbelt.

2. Remove the screw (D1) x 1 pc., to remove the motor mount.

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

Note:

When mounting the motor, pay attention to the motor mounting
angle.

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

1. Remove the belt.

2. Remove the stop washer (E1) x 1 pc., with a small precision

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

Install each part in the reverse order of the removal with care.

Figure 5-1

Figure 5-2

Figure 5-3

Figure 5-4

Figure 5-5

(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-CD210/C

– 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 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

• 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

TUNER SECTION

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

• FM IF/RF

FM Detection T2

FM fL: L2
Band Coverage fH: TC2

FM Tracking fL: 88.0 MHz: L1

fH: 108.0 MHz: TC1

Test Stage Specified

Value/Adjusting

Point

Instrument

Connection

Input: Pin 1 of IC1
Output: Pin 18 of IC1

Iuput: Antenna
Output: Speaker
Terminal (CNP201
Load resistance: 4
ohms)

• AM IF/RF

AM IF T3 Input: Antenna

Output: Pin 18 of IC1

AM fL: L4 Input: Antenna
Band Coverage fH: TC4 Output: Speaker
AM Tracking fL: 600 kHz: L3 Terminal (CNP201

fH: 1,400 kHz: TC3 Load resistance: 4

ohms)

Test Stage

Specified

Value/Adjusting

Point

Instrument

Connection

Figure 6 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 1 of CNP101

TC4

TC2

TC1

TC3

FM ROD
ATENNA

MAIN PWB

1

13

18

AM BAND
COVERAGE

fL

fH

FM
TRACKING

FM BAND
COVERAGE

fL

fH

fH

fL

AM IF
FM
DETECTION

L4

12

24

BIAS OSC.

AM
TRACKING

fL

fH

IC803

L2

CNP101

SW102

IC101

CNP201

VR201

SW201

L1

T3

L301

CNP602

T2

IC1

L3
AM BAR
ANTENNA

1

12

11

2

1

2

3

4

1

123

QT-CD210/C

– 7 –

CD SECTION

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

TEST MODE

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

Start
Note

1. When the CD LID switch is in the OFF position, (CD LID is open) the unit will be able to enter the test mode.
However, can use the "UP/CUE" and "DOWN/REVIEW" button only.

2. You can only move the pickup.

3. The LCD display should be the same as it is for normal CD operations.
1

2

When the "PLAY" button is pressed, the laser will be lit. If the laser is lit and the "PLAY" button is pressed again,
play back will start from the current pickup position . In the playback operation, the "STOP" button is pressed,
the laser will be geve out and the playback is stopped.

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.

After connecting of the 10kΩ resistor between IC802 27 pin and GND and holding down the "PLAY" button, move
the FUNCTION/POWER switch to "CD".

Start

Display

LCD MODE

QT-CD210/C

– 8 –

A

B

C

D

E

F

G

H

1

2

34 5

6

• The numbers 1 to 17 are waveform numbers shown in page 13.

Figure 8 SCHEMATIC DIAGRAM (1/2)

C856

0.001

C832
47/16

C22

0.1/50

L801

0.82µH

D801
1N4004

L4

AM OSC.

Q803
KRC107 M
SWITCHING

R850

1.5K

Q802
KTA1273 Y
SWITCHING

C806
330/16

C805

0.022

C21
2P(CH)

R3

220K

C13

220/10

R126
100

C122

0.01

R10

2.2K

R11

2.2K

COR1
CORE

SW201-C

SW201-B

C1

0.022

C20

0.047

C2
18P
(CH)

T3

CF3
460KHz

C14

0.022

IC1
TA2111N

9

8

7

6

5

43

2

1

T2

F1

FM BAND

PASS FILTER

D1

1N4148

R2

2.7K

C4
4P(CH)

C3
22P(UJ)

L2

VC3

CNP101

BI802

BI801

C817

100/10

D2

1N4148

R6
100

C854

0.0068

C807

0.047

R456
15K

R455
15K

R457
1K

R458
1K

R7
120

R853

2.2K

R852

2.2K

R110
120

D101

1N4148

R123

3.3K

R124

3.3K

R851

2.2K

C816

0.022

IC801

TA2109F

24

23

22

21
20
19
18
17
16
15

14
13

12

11

10

9

8

7

6

5

4

3

2

1

C814

0.047

C813
47/16

C106

0.0027

R106
10K

R114

8.2K

R105
10K

C107

820P

C114
47/16

D102

1N4148

C118
10/16

R102
150

C109
270P

R109
120

C115

0.018(ML)

R116

3.9K

R115

3.9K

C111
330P

R108
1K

C105

0.0027

R122

1.8K

R802

2.2K

C815
47/16

BI803

R107
1K

R120

3.3K

C110
270P

C113
47/16

C802

0.022

C804
2P
(CH)

R811
22K

R5

3.3K

C6
330P

CF1

10.7MHz

C11

0.47/50

C15
10P
(CH)

R1

330

C12

4.7/50

C17

1/50

C19

0.015
(ML)

C16

1/50

C18

0.015(ML)

R9

10K

C10
1/50

C7

2.2/50

C9

0.1/50

C8

0.1/50

R4

2.2K

R8

10K

R820
47K

R833

3.3K

C841

0.047

C833

0.033(ML)

C838

0.047(ML)

R830

10K

C839

0.047(ML)

R831

3.3K

C835
470P

C834
470P

R827
15K

C82

0.0

C836

0.047(ML)

C

0.

C825
47/16

C826
47P

C837

0.047(ML)

R828
10K

C829

0.0047

C828

0.0027

C830

0.01(ML)

C123
220/10

C822

0.047

Q801
KTA1266 GR
SWITCHING

C818
56P

C821
100/10

R803
82K

C117
10/16

IC101

BA3311L

9

8

7

6

5

4

3

2

1

C108
820P

R121

1.8K

C116

0.018(ML)

R801
22

C863
47/16

C842

0.047

C843
47/16

IC803
LA6541D

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

R804
68K

C819

0.1(ML)

R117

3.9K

R113

8.2K

C820

0.1(ML)

R806

2.7K

R805
39K

R807
1K

L301

BIAS OSC.

C351

0.0022
(ML)

R35
150

C121

0.01

C120

47/16

C119

2.2/50

R125
680K

C112
330P

R101
150

R118

3.9K

R351
100

C354

0.022

C352
100/10

R119

3.3K

R104

12K

R103
12K

C801

0.01

SW102-A

SW102-F

SW102-E

SW102-B

SW102-C

SW102-H

SW102-G

SW102-D

NC

NC

NC

NC

NC

CNS101

FM

AM

4

3

R-CH

L-CH

TRO

FOO

DMO

FMO

VCC

VREF

CD

RES

REG IN

REG OUT

VIN4

VIN3

VIN

GND

GND

GND

GND

GND

GND

VG4

VG3

VG2

VO4-

VO4+

VO3-

VO3+

VO2+

VO2-

VO1-

VO1+

VG1

VIN1

MT

VCC

AM OSC.

FM ANT

ST

LED

TUN

LED

AM RF
IN

FM RF

OUT

RF

GND

L3

AM BAR ANTENNA

LPF1

AM/FM

LPF2

VCO

GND

AM IF

IN

FM IF

IN

AM

AGC

AM LOW

CUT

CNS802

CNS801

CNS803

R-CH(CD)

L-CH(CD)

GND(AUDIO)

RF

VCC

FM

OSC

AM

OSC

VCC

FM

AFC

DET

MPX IN

CNP803

FM ROD
ANTENNA

ALC T

FILTER

VCC

GND

NF1

NF2

IN2

IN1

OUT2

OUT1

R

P

R

R

P

R

P

P

P

R

R

R

R

L-CH

R-CH

PRE AMP

ERASE HEAD

TAPE

AM
FM
CD

CD

TAPE

FM OSC.

AM ANT

FM OSC.

AM IF

L-CH

R-CH

FM RF

IN

MIX

OUT

FM

DET

P

+

+

-

-

SP+
SP­SL+
SL-

PU-IN

LD

K
E

E

K

LD

VR

PD

G

B

B

A
F

F

C

TR+

TR-

FO+

FO-

R­R+
F+
F-

2200P

2200P

PICK-UP UNIT

CD MOTOR PWB-B

M701
SLED

MOTOR

M702

SPINDLE

MOTOR

FC-

FC+

TR-

TR+

GND
PD
VR
LD

GND

K

F

B

E
A

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

1M

1M

SLT-

SLT+

FM-

FM+

DM-

DM+

6

4 3
2
1

13

17
16
15
14

12

8

9
10
11

2

1

3

16

2

4

5

3

16 17 18

4

4

5

654

1

5
4
3
2

6
5

5
6
7
8

1
2
3
4

987

3

2

1

2

1

3
4

3

2

1

2

1

3

3

2

1

M

3

1

19

20 21

5

1
2
3
4

4
3
2
1

M

1

463

2
1

1
2
3

22

23

24

2

3

4

5

6

1

5

1

2

3

4

2

8

7

6

4

13

14

15

12

11

10

2

5
6
7
8

3

4

5

6

1

2

SW702
PICKUP IN

A

NC

NC

NC

NC

NC

NC

1

2

3

L1
FM IF

16

17

18

19

20

2122232425

2627282930

1

2 3

10 11

12

13

14

15

16

17

18

1920

21222324

11 12

10

P

P

NC

VC1

VC2

VC4

TC3

TC4

TC2

TC1

NC

NC

NC

IC801

SERVO PRE AMP.

TA2109F

IC803

FOCUS/

TRACKING/

SPIN/

SLED DRIVER

LA6541D

IC1

FM/AM IF MPX.

TA2111N

FM IF

AM IF

SW102
RECORD/PLAYBACK

SW102
RECORD/
PLAYBACK

IC101
REC./
P.B. EQUALIZER AMP.
BA3311L

SW201
FUNCTION
SELECTOR

MAIN PWB-A1

RECORD/
PLAYBACK HEAD

TAPE

SW102
RECORD/
PLAYBACK

SW10
RECO
PLAY

FM DETECTION

9

8

7

6

5

4

3

2

1

12

11

10

PIN
NO.

VOLTAGE

IC1

0.82V(0V)
0V(0V)

0.35V(1.03V)

3.81V(3.82V)
0V(0.13V)

3.92V(3.86V)

3.39V(3.18V)

3.92V(3.86V)
0V(0V)
0V(0.14V)

0.32V(0.32V)

3.14V(3.29V)

21

20

19

18

17

16

15

14

13

24

23

22

PIN
NO.

VOLTAGE

1.22V(1.22V)

1.22V(1.22V)

3.20V(3.14V)

3.14V(3.92V)

0.7V(0.70V)

1.08V(1.01V)

0.4V(1.02V)

3.92V(3.85V)

3.92V(3.86V)

3.92V(3.86V)

3.92V(3.86V)

3.92V(3.82V)
( ): AM

9

8

7

6

5

4

3

2

1

12

11

10

PIN
NO.

VOLTAGE

IC801

4.84V

2.04V

2.04V

2.12V(0V)

2.11V(0V)

0.18V(0V)

2.84V(0V)

2.41V(0V)

2.05V

4.08V

2.05V

2.08V

21

20

19

18

17

16

15

14

13

24

23

22

PIN
NO.

VOLTAGE

2.86V(0.99V)

2.12V

2.05V

2.05V

2.63V(1.15V)

2.04V

2.07V

2.17V

2.04V

1.47V(0.77V)
0V

2.05V

( ): CD STOP

9

8

7

6

5

4

3

2

1

15

11

10

PIN
NO.

VOLTAGE

IC803

8.15V

1.08V

2.12V

2.10V

4.0V

3.42V
0V
0V
0V

3.85V

3.60V

2.09V

2.09V

6.02V

7.47V

24

23

22

21

20

19

18

17

16

30

26

25

PIN
NO.

VOLTAGE

0V

0.24V

2.13V

2.09V

4.03V

3.38V

0V
0V
0V

3.70V

3.71V

2.09V

2.11V

2.10V

8.14V

13

12
14

28

27
29

3.72V
(5.0V)

( ): CD STOP

1.87V
(1.45V)

2.97V

(4.39V)

( ): CD STOP

8.21V
(8.3V)

8.15V
(8.3V)

7.48V
(7.59V)

0V
(0V)

0V
(0V)

4.97V(5.0V)

1.88V

0V

0.6V

0V

0V

0V

0V

4.67V

0V

4.62V

0.6V 1.89V

VOLTAGE:
PLAY and REC

AM
TRACKING

fH
fL

TC3
L3

AM BAND
COVERAGE

fH

fL

TC4
L4

FM BAND
COVERAGE

fH
fL

TC2
L2

FM
TRACKING

fH
fL

TC1
L1

SW102
RECORD/
PLAYBACK

SW102
RECORD/
PLAYBACK

+B

+B

+B

+B

+B

+B

2

3

8

9
10

QT-CD210/C

– 9 –

Figure 9 SCHEMATIC DIAGRAM (2/2)

78 9 101112

• NOTES ON SCHEMATIC DIAGRAM can be found on page 12.

C216

0.1(ML)

C215

0.1(ML)

C220
1/50

C241
47/16

C219
1/50

C832
47/16

C238
100/10

C237
100/10

D201
1N4148

C651

0.022

R232
120

C236

100/10

R231
120

C235
100/10

R216

2.2K

R215

2.2K

C226

0.022

R860
100

R835
270

R836
270

R837
10K

R838
10K

C851

3.3/50

C849

0.0022

C847

22/16

C848

22/16

C853

0.022

C844
100/10

L801

0.82µH

D801
1N4004

LCD801
LCD DISPLAY

8

7

6

5

4

321

FW806

R848

2.2K

SW804
CUE/UP

SW803
REVIEW/
DOWN

SW802
STOP

SW801
PLAY/
PAUSE

R849

6.8K

R847
1K

803
RC107 M
WITCHING

C240

0.1

C239

0.1

C225
100/10

IC201

TA8227P

POWER

AMP.

12

11

10

9

8

7

6

5

4

3

2

1

R222
1K

C222

0.001

C221

0.001

R221
1K

C218

0.0015

VR201-A
20K(B)

C217

0.0015

R219
1K

R220

2.7K

R843

3.3K

C204

0.022

D203
1N4148

Q204
KTA1046 Y
REGULATOR

Q205

KTC3199 GR

C203

0.01

D202

1N4148

R201

2.2K

R202

4.7K

ZD201

DZ5.1BSB

R203
560

C202
47/16

SW201-A

D651

1N4004

SW201
FUNCTION
SELECTOR

SW201-C

SW201-B

C652

0.022

C824

0.022

C855

0.022

C653

0.022

D652

1N4004

CNS602

CNP602

R230

2.7

C854

0.0068

R456
15K

R455
15K

R457
1K

R458
1K

CNP201

C233
470/10

C234
470/10

R820
47K

C840

0.047

C823

0.022

X801

16.93MHz

R833

3.3K

R821
22K

C833

0.033(ML)

R834

3.3K

C838

0.047(ML)

R812
1K

80

79

78

77

76

75

74

73

72

71

70

69

68

67

66

65

64

63

62

61

60

59

58

57

56

55

54

53

52

51

50

30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10

9
8
7
6
5
4
3
2
1

C846
10/16

R829

3.3K

R830

10K

C839

0.047(ML)

R861

3.3K

R831

3.3K

835
70P

C834
470P

R844

3.3K

R827
15K

C827

0.015(ML)

R832

3.3K

C836

0.047(ML)

R862
22K

C845

0.047

R824
10K

C825
47/16

C826
47P

C837

0.047(ML)

R828
10K

C829

0.0047

C828

0.0027

C830

0.01(ML)

R839
47K

R840
10

C227

3300/16

Q351
KTC3199 GR

L301

BIAS OSC.

R354

4.7

C353

0.0056(ML)

C351

0.0022
(ML)

R352
150

R353
33K

R351
100

C354

0.022(ML)

C352
100/10

SW102-D

SO651

AC INLET

SOCKET

AC120V,60Hz

T651

POWER

TRANSFORMER

FM

AM

BATTERY
DC 9V ["D" size (UM/SUM-1,R20 orHP-2)
battery x 6]

R-CH

L-CH

POWER PWB-A3

NC

SP202

SP201

MUTE

R-CH(CD)

L-CH(CD)

GND(AUDIO)

GND(POWER)

GND(CD)

SPEAKERS

L-CH

R-CH

4 OHM

4 OHM

+5V(CD)

SELECTOR

-

+

SW601
TAPE
MAIN

M601
TAPE
MOTOR

TAPE

AM
FM
CD

CD

FM

AM

TAPE

AC/DC

AC INPUT

-

-

+

+

R

TAPE

AM
FM
CD

CD

TAPE

PUSEL2

DISPLAY

TRAY CLOS

MVSS1

MVDD1

CDSEL0

SEG1

COM1

MVDD

MVSS

MXI

MXO

REMO-IN

RYNCREC

RESET

DVSL

LO

DVRL

DVDD

DVRR

RO

DVSR

TEST0

SPCK

SPDA

COFS

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

XI
XO

XVDD

SEG2

SEG3

SEG4

SEG5

SEG6

SEG7

SEG8

SEG9

SEG10

SEG11

SEG12

SEG13

SEG14

DOOR IN

DOOR OUT

ADIN1

ADIN2

MUTE

PU IN

TEST1

TEST2

TEST3

TEST4

TEST5

/HSO

CDSEL1

TRAY OPEN

PUSEL0

PUSEL

XVSS

COM2

COM3

COM4

NC

CD CONTROL PWB-A2

1

1

10

CNS201

1

2
3
4
5

19

23
22
21
20

13

17
16
15
14

12

8

9
10
11

M

1
2

2

1

1
2
3

1
2
3

3

2

1

463

2
1

12

11

10

10

R826
220K

R846
330

NC

NC

NC

NC
NC

NC
NC

NC

NC

NC
NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

494847

46 45 44

43 42 41 40 38

37 36

35 34 33 32

31

39

NC

NC

NC

818283 84 85 86 878889 90 919293 94

95

96 97 98 99

100

C850

0.0022

C852

3.3/50

VR201-B
20K(B)

C654

0.022

D654

1N4004

D653

1N4004

P

NC

NC

IC802

SERVO/

SIGNAL CONTROL

TC9457F0

LIZER AMP.

SW201
FUNCTION
SELECTOR

SW201-D

SW201
FUNCTION
SELECTOR

+

+

-

-

RECORD SIGNAL

PLAYBACK SIGNAL

CD SIGNAL

FM SIGNAL
AM SIGNAL

VOLUME

VOLUME

SW102
RECORD/
PLAYBACK

SW810
CD LID

OPEN/CLOSE

9.05V

5.08V

8.44V

4.39V

8.44V

4.96V

2.49V

2.49V

2.49V

2.49V

2.49V

2.49V

2.49V

2.49V

2.49V

2.49V

2.49V

2.49V

2.49V

2.49V

0V

0V

0V

0V

4.98V

0V

0V

0V

0V

4.98V

0V

4.98V

4.98V

0V

4.97V

0V

0V

0V

0V

0V

0V0V0V

0V

4.97V

2.49V

0.43V(2.36V)

( ): STOP

1.66V

2.46V

0V

4.97V(0V)

4.98V

0V

4.18V

2.10V

2.08V
(0V)

2.10V(1.34V)

51

2.01V(4.12V)

52

2.10V

53

1.50V

0V

2.10V

2.10V

4.98V

2.10V

2.10V

2.73V(1.15V)

2.30V(2.1V)

2.94V(0.989V)

2.14V

2.14V

2.18V

2.11V

2.10V

2.14V

2.10V

2.10V

2.17V

4.18V

2.47V(0V)

4.97V
0V
0V

2.08V

2.57V

4.92V

0V

2.48V

2.37V

4.72V

2.36V

2.47V

0V

0V

0V

4.95V

0V

4.96V

4.96V

0.30V
0V

4.96V

2.33V

2.33V

2.33V

2.33V

STOP

4.97V(5.0V)

0V

3.32V

0.68V

8.35V

4.27V

8.01V

0V

0V

0.56V

0V

0V

0.56V

4.67V

0V

8.02V

4.33V

9.05V

13

14

+B

+B

+B

+B

+B

+B

+B

+B

+B

+B

+B

+B

+B

+B

+B

+B

4

5

1

7

6

12

14

15

11

17

16

RECORDING
BIAS OSCILATOR

SWITCHING

12

13

QT-CD210/C

– 10 –

Figure 10 WIRING OF P.W.BOARD (1/2)

A

B

C

D

E

F

G

H

1

2

34 5

6

• The numbers 1 to 17 are waveform numbers shown in page 13.

OPEN/CLOSE

SW810
CD LID

BK

BK

FW806

1

1

10

10

3 2 1

YL

RD
BK

1 2 3

C

AEB

H

D

G

F

VC4

TC4

VC3

TC3

VC2

TC2

VC1

TC1

R860

C843

R824

IC201

IC803

L2

IC802

IC801

C105

R105

R104

R103

R101

R107

R108

C107

C108

R102

CNP101

C115

C113

C109

R109

C112

R110

C110

C114

C111

R113

R115

D101

R117

C121

C120

R125

C117

D102

IC101

R119

R124

R123

R121

C123

C122

R126

C216

R220

C218

CNP201

C202

ZD201

C203
D203
D202
R203

R221

R222

R216

VR201

R215

C217

R219

R458

R457

C215

R455

R456

R837

C851

R835

C849

C848

C852

R838

L801

R839

R836

C844

C855

C853

C846

C847

C850

R862

R844

C824

R846

R861

C21

C3

C2

L1

F1

R4

D2

C22

R7

R6

C11

C1

T3

BI803

R851

C825

R843

C842

R821

C823

R826

C827

R827

C826

R820

C841

C830

C838

R852

C829

C828

C863

R828

C833

R834
R833

R831
R830
R829

R832

R840

C840

X801

C845

C832

R812

C837

C836

C854

C821

C822

C818

R807

C820

C819

C222

C220

C221

C219

R231

C225

C235

R232

C236

C238

C234

C240

C226

D201

C237

C204

Q205

R202

Q204

R201

C239

C233

C227

R122

R120

C119

C118

R118

R116

R114

C116

C106

R106

R354

Q351

R353

C353

L301

C351

R351

C352

C354
R352

R230

CNP602

Q803

R850

Q802

D801

C813

C814

R811

R803

BI802

BK
WH
WH
WH
WH

BK

WH
WH
WH
WH
WH
WH
WH

BI801

R802

C802

C801

C816

R805

R806

C804

R804

C815

C817

R801

Q801

R853

C839

C835

C834

C805

C807

C806

SW803

REVIEW/DOWN

C856

R11

R8

R9

C16

C17

R10

COR1

T2

C13

C15

C20

C18
C19

C14

R3

C12

CF1

R1

CF3

IC1

C4

D1

C10

R5

C9

C8

C7

C6

R2

L4

SW802

STOP

R847

R848

LCD801

R849

SW801

PLAY/

PAUSE

SW804

CUE/UP

CNS802

CNS801

1

2

3

4

1
2
3
4
5

8
7
6
5
4
3
2
1

1

1

5

8

1

6

SW102

RECORD/

PLAYBACK

12

1

3 5 7 9

11

2

4 6

8

10

EC

B

2

1
3

14

4
5
6

12
11
10

13

9
8
7

E
C
B

B
C
E

VOLUME

VR201-B

VR201-A

A

B

C

D

SW201

FUNCTION

SELECTOR

CD

POWER

TAPE

OFF

ON

FM
AM

1

5

10

15

20

25

30

31

35

40

45

50

51

55

60

65

70

75

80

81

85

90

95

100

1

B

1E

C

2
3

1

5

10

12

13

15

20

24

BC

E

5

10

15

16

20

25

30

1

2

3

1

2

3

1

2

3

1

5

10

12

13

15

2024

PLAY

REC.

SW201

SPEAKERS

SP201 SP202

R-CHL-CH

CNS201

WH

BK

RD

MAIN PWB-A1

CD CONTROL
PWB-A2

L3 AM BAR ANTENNA

WHGYGYGYGY

GY

1 2

1
2
3
4
5
6
7
8

2

3

12

13

8

10

4

5

1

6

14
15
11

16

17

7

C241

9