AIWA CDC452, CD-C452C Service Manual

Illustration: CD-C452/C452C

CD-C452/C452C

SERVICE MANUAL

No. S4825CDC452//

CD-C452/C452C

CP-C452 Constitute CD-C452/C452C.

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

This Service Manual is for the CD-C452/452C, which is a minor­modification model of the CD-C472. This manual, therefore,
describes only the changed points from the Service manual.
Please refer to the CD-C472 Service Manual (No. S2812CDC472//)
together with this manual.

CD-C472

Manufactured under license from Dolby Laboratories Licens­ing Corporation. DOLBY, the double-D symbol and
"PRO LOGIC" are trademarks of Dolby Laboratories Licens­ing Corporation.



QSOUND and the QLogo are registered trademarks of

QSound Labs, Inc.



QSound is protected under US Patent Nos. 5,105,462

and 5,208,860 and foreign counterparts.

OPERATION MANUAL .................................................... 5

REMOVING AND REINSTALLING THE MAIN PARTS...

ADJUSTMENT ............................................................... 12

TROUBLESHOOTING

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

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

FL DISPLAY................................................................... 44

CONTENTS

IMPORTANT SERVICE NOTES (For U.S.A. Only) .......................................................................................................... 2

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

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

QUICK GUIDE .................................................................................................................................................................. 5

DISASSEMBLY................................................................................................................................................................. 6

NOTES ON SCHEMATIC DIAGRAM ............................................................................................................................... 9

WAVEFORMS OF CD CIRCUIT..................................................................................................................................... 10

BLOCK DIAGRAM .......................................................................................................................................................... 11

SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD.............................................................................................14

FUNCTION TABLE OF IC................................................................................................................................................28

REPLACEMENT PARTS LIST/EXPLODED VIEW

PACKING OF THE SET (For U.S.A. Only)

Page

10

Page

SHARP CORPORATION

– 1 –

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

CD-C452/C452C

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

IMPORTANT SERVICE NOTES (For U.S.A.Only)

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.

VTVM

AC SCALE

1.5k ohms
10W

0.15 µ F

TO EXPOSED
METAL PARTS

TEST PROBE

CONNECT TO
KNOWN EARTH
GROUND

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.

SPECIFICA TIONS

CD-C452/C452C

General

Power source: AC 120 V, 60 Hz
Power consumption: 80 W
Dimensions: Width; 10-5/8" (270 mm)

Height; 11-13/16" (303 mm)
Depth; 13-13/16" (350 mm)

Weight: 13.8 lbs. (6.3 kg)

Amplifier section

Output power: FTC; 40 W minimum RMS per channel into
(CD-C452) 6 ohms from 60 Hz to 20 kHz with no

more than 10 % total harmonic distortion.

Output power: MPO; 176 W (88 W + 88 W)
(CD-C452C) (10 % T.H.D.)

RMS; 80 W (40 W + 40 W)
(10 % T.H.D.)

Output terminals: Speakers; 6 ohms

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

Input terminal: Video/Auxiliaary (audio signal);

500 mV/47 kohms

Tuner section

Frequency range: FM; 87.5 - 108 MHz

AM; 530 - 1,720 kHz

Cassette deck section

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

50 dB (TAPE 2, recording/playback)

Wow and flutter: 0.15 % (WRMS)

Compact disc player section

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

laser pickup

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

Front speaker section

CP-C452

Type: 3-way type [5-1/8" (130 mm) woofer , 2" (50

mm) tweeter and super tweeter]

Maximum input power: 80 W
Impedance: 6 ohms
Dimensions: Width; 7-7/8" (200 mm)

Height; 11-13/16" (300 mm)
Depth; 10" (253 mm)

Weight: 5.9 lbs. (2.7 kg)/each

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

– 2 –

CD-C452/C452C

CD-C452/C452C

NAMES OF PARTS

Front Panel

1. Disc Tray

2. Disc Number Selector Buttons

3. Disc Skip Button

4. Open/Close Button:

5. Disc Number Indicator

6. Timer Indicator

7. Record Indicator

8. Sleep Indicator

9. Extra Bass Indicator: X-BASS

10. (CD/TUNER) Memory Indicator

11. FM Stereo Mode Indicator: ST

12. FM Stereo Indicator:

13. (CD) Repeat Indicator:

14. (CD) Play Indicator:

15. (CD) Pause Indicator:

16. Power Button

17. Dolby Pro Logic Button

18. QSOUND Button

19. Extra Bass Button: X-BASS

20. Main Volume Up/Down Buttons:

21. Function Selector Buttons

22. Timer/Sleep Button

23. Clock Button

24. Headphone Socket

25. Tuning and Time Up/Down Buttons:

26. Memory/Set Button

27. (TAPE) Record Pause Button:

28. (CD) Track Down/Review Button:
(TUNER) Preset Down Button:

29. (CD/TAPE) Stop Button:

30. Virtual Surround Button

31. (TAPE) Play Button:
(CD) Play/Repeat Button:

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

33. Equalizer Selector/Demo Mode Button

34. (CD) Pause Button

35. (CD) Random Button

36. (CD) Clear Button

37. (TAPE 1) Cassette Compartment

38. (TAPE 2) Cassette Compartment

1

56789

1 2 3

REC

16 17 18 19

21
22

23
24

25

2728

26

234

SLEEP

X-BASS

13

30 31 32

29

37

38

10

11

MEMORY ST

kHz
MHz

14 15

20

33

12

35
36

34

Rear Panel

1. AC Power Input Socket

2. FM/AM Loop Aerial Socket

3. Video/Auxiliary (Audio Signal) Input Sockets

4. Rear Output Socket

5. Center Output Socket

6. Speaker Terminals

– 3 –

2
3

4

1

5

6

CD-C452/C452C

Speaker Section
Front Speaker

CP-C452

1. Super Tweeter

2. Tweeter

3. Woofer

4. Bass Reflex Duct

5. Speaker Wire

Left speaker Right speaker

1

2
3
4

5

CD-C452/C452C

Remote Control

1. Remote Control Transmitter LED

2. Center Level Buttons:

3. Dolby Pro Logic Button

4. Virtual Surround Button

5. QSOUND Buton

6. Test Tone Button

7. Balance Control Buttons:

8. Surround Level Buttons:
Tuner control section

9. Preset Up/Down Buttons:
CD Control section

10. Disc Skip Button

11. Play/Repeat Button:

12. Memory Button

13. Clear Button

14. Pause Button:

15. Track Down/Review Button:

16. Track Up/Cue Button:

17. Stop Button:

18. Random Button

Tape control section

19. (TAPE 1) Play Button:

20. (TAPE 1/2) Stop Button:

21. (TAPE 2) Play Button:

22. (TAPE 2) Record Pause Button:

23. (TAPE 2) Rewind Button:

24. (TAPE 2) Fast Forward Button:
Common section

25. Equalizer Mode Button

26. Function Selector Buttons

27. Power Button

28. Extra Bass Button: X-BASS

29. Volume Up/Down Buttons:

2
3

4

5
6

7

12

25
26

27
28

13

19 20

14

1

15 16

17

21 22

8
9

10
11

18

23
24

29

– 4 –

CD-C452/C452C

MINI COMPONENT

SYSTEM

Quick-Guide

Guía rápida

Preparation for use

Preparación para su uso

Turning the power on and off

Conexión y desconexión de la alimentación

Remote co ntrol

Control remot o

RIGHT

RATED SPEAKER IMPEDANCE:

6 OHMS MIN.

LEFT

SPEAKERS

FM

AM

LOOP

ANTENNA

POWER

POWER

15

15

Sound contr ol

Control de l sonido

VOLUME

UP • • •

X-BASS

DOWN •

VOLUME

DEMO

EQUALIZER

EQUALIZER

MODE

● FM Antenna

● AM Loop Antenna

Red

Black

Red

Black

● AC 120 V, 60 Hz

● 2 "AA" batteries

● Batteries are not

included.

Remote Sensor

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

● Volume

● Equalizer

●

Antena de FM

●

Antena de cuadro de AM

Rojo

Negro

Rojo

Negro

●

120 V de CA, 60 Hz

●

Dos pilas "AA"

●

Las pilas no

están incluidas.

Sensor remote

0,2m - 6m

●

Volumen

●

Ecualizador

+

-

-

+

FLAT HEAVY-1

HEAVY-2

SOFT-2

SOFT-1

VOCAL

● Extra-BASS

●

Graves extra

VOLUME

UP • • •

X-BASS

DOWN •

X-BASS

CD playback

Reproducción de discos compactos

Radio operation

Funcionamiento de la radio

Tape playback

Reproduc ción de cintas

Recording from CDs

Grabación de discos compactos

Precaution

Precaución

● Label facing up

● Load the disc to be recorded. ● CD recording starts.

● The sound level at a given volume setting

depends on a combination of speaker effi-

ciency, location and many other factors. It is

advisable to avoid exposure to high volume

levels, which occur while turning the unit on

with the volume control setting up high, or

while continually listening at high volume le-

vels.

● Only discs bearing the logo as shown can

be played in this unit.

●

Etiqueta hacia arriba

●

Introduzca el disco que va a grabar.

●

La grabación de CD empieza.

●

El nivel de sonido en una posición de volumen

fijado depende de una combinación del rendi-

miento de las altavoces, la posición y muchos

otros factores. Es aconsejable evitar un aumen-

to de volumen. Esto se produce, por ejemplo,

al conectar el aparato con el volumen puesto

en una posición alta. Evite continuar la audición

prolongada a altos niveles de sonido.

●

En este aparato sólo pueden reproducirse los

discos que tengan el logotipo mostrado.

OPEN

/CLOSE

OPEN

/CLOSE

C D

TAPE 1

TAPE

(1 2)

TAPE 2

TUNER

(BAND)

TUNING/TIME

ST

FM STERO

FM MONO

AM

REC PAUSE

C D

TAPE 2

– 5 –

CD-C452/C452C

LOCK 
LEVER

< A >

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 suffcient care on static electricity of integrated
circuits and other circuits when servicing.

CD-C452/C452C

STEP REMOVAL PROCEDURE FIGURE

1 Top Cabinet 1. Screw ..................... (A1) x4 6-1

2 Side Panel 1. Screw ..................... (B1) x6 6-1

(Left/Right)

3 CD Player Unit/ 1. Turn on the power supply, 6-2

CD Tray Cover open the disc tray, take out

the CD cover, and close.
(Note 1)

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

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

4. Screw ..................... (C3) x1

5. Socket .................... (C4) x2

4 Back Board 1. Screw ..................... (D1) x9 6-2

2. Socke ..................... (D2) x1

5 Main PWB 1. Screw ..................... (E1) x1 7-1

2. Socket .................... (E2) x2

3. Flat Wire................. (E3) x1

4. Tip Wire.................. (E4) x1

5. Socket .................... (E5) x1

6 Front Panel 1. Screw ..................... (F1) x2 7-1

7 Display PWB/ 1. Socket .................... (G1) x1 7-2

Switch PWB 2. Screw .....................

8 Tape Mechanism 1. Open the cassette holder. 7-2

2. Screw...................... (H1) x5

9

Power Amp. PWB

10 Turntable 1. Screw ..................... (K1) x1 7-4

11 CD Player Base 1. Screw ..................... (L1) x2 7-4

12 CD Servo PWB 1. Screw ..................... (M1) x1 7-5

13 CD Changer 1. Screw ..................... (N1) x4 7-6

14 CD Mechanism 1. Screw ..................... (P1) x1 7-6

Mechanism

1. Screw ..................... (J1) x3 7-3

2. Socket .................... (J2) x2

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

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

2. Socket .................... (M2) x4

(G2) x11

CD-C452/C452C

( A1 ) x2
ø3 x12mm

( B1 ) x2
ø3 x8mm

Side Panel
(Right)

( B1 ) x2
ø3 x8mm

( C4 ) x2

A

CD Player Unit

Back Board


( D2 ) x1

( C3 ) x1
ø3 x8mm

Back Board


( D1 ) x7
ø3 x8mm

Figure 6-1

(C2) x1

Pull

Figure 6-2

Top Cabinet

CD Tray Cover

1

( D1 ) x2
ø3 x10mm

( A1 ) x2
ø3 x12mm

Side Panel
(Left)

( B1 ) x2
ø3 x8mm

Hook
( C1) x3

1
2

Front Panel

Main PWB

( C2 ) x1

Note 1:

How to open the changer manually. (Fig. 6-3)

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

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

Figure 6-3

– 6 –

( E4 ) x1


( E2 ) x2


CD-C452/C452C

( K1 ) x1
ø3 x10mm

Front Panel

( K2 ) x1

Washer

Turntable

( E3 ) x1


Power Amp. 
PWB

Main PWB

( G2 ) x3
ø3 x10mm

( G2 ) x8
ø3 x10mm

Push

(E5) x1


Figure 7-1

Switch PWB

Push

( F1 ) x2
ø3 x8mm

Front Panel

( G1 ) x1

Tape
Mechanism

( E1 ) x1
ø3 x10mm

Display 
PWB

Open

( L1 ) x1
ø3 x10mm

( L2 ) x1

Loading chassis

( M2 ) x2

CD Player Base

( L1 ) x1
ø3 x10mm

( L2 ) x1

Figure 7-4

( M1 ) x1
ø3 x10mm

CD Servo PWB

( H1 ) x5
ø3 x10mm

Power 
Transformer

( J2 ) x1

Tape
Mechanism

Figure 7-2

( J1 ) x3
ø3 x12mm

Cassette
Holder
(Left/Right)

( J2 ) x1

Power Amp. 
PWB

( M2 ) x2

Loading chassis

Figure 7-5

( N1 ) x4

ø3 x12mm
( P1 ) x1
ø2.6 x10mm

Shift Lever

CD Changer
Mechanism

CD Player Base

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

CD Mechanism

Figure 7-3

Figure 7-6

– 7 –

CD-C452/C452C

CP-C452

STEP REMOVAL PROCEDURE FIGURE

1 Front Speaker 1. Net.......................... (A1) x1 8-1

2. Baffle Board ........... (A2) x1

3. Screw ..................... (A3) x2 8-2

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

5. Screw ..................... (A5) x2

Note:

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

CP-C452

Tweeter

Baffle Board
( A2 ) x1

Net
( A1 ) x1

Woofer

Screwdriver

Figure 8-1

Super
Tweeter

( A3 ) x2
ø3 x10mm

( A4 ) x4
ø4 x14mm

( A5 ) x2
ø3 x10mm

Tweeter

Woofer

Figure 8-2

– 8 –

NOTES ON SCHEMATIC DIAGRAM

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

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

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

CD-C452/C452C

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

1. In the tuner section,

( ) indicates AM
< > indicates FM stereo

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

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

( ) indicates the record state.

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

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

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

REF. NO

SW1 OPEN/CLOSE ON—OFF
SW2 MECHA UP ON—OFF
SW3 DISC NUMBER ON—OFF
SW4 PICKUP IN ON—OFF
SW701 EQUALIZER/DEMO ON—OFF
SW702 VOLUME DOWN ON—OFF
SW703 X-BASS ON—OFF
SW704 VOLUME UP ON—OFF
SW705 OPEN/CLOSE ON—OFF
SW706 DISC SKIP ON—OFF
SW707 DISC 1 ON—OFF
SW708 DISC 2 ON—OFF
SW709 DISC 3 ON—OFF
SW710 REC/PAUSE ON—OFF
SW711 PRESET UP ON—OFF
SW712 STOP ON—OFF
SW713 PLAY/REPEAT ON—OFF
SW714 PRESET DOWN ON—OFF
SW715 TUNING UP ON— OFF

DESCRIPTION

POSITION POSITION

REF. NO

SW716 TUNING DOWN ON—OFF
SW717 POWER ON—OFF
SW718 CLOCK ON—OFF
SW719 TIMER/SLEEP ON—OFF
SW720 MEMORY/SET ON—OFF
SW721 CD ON—OFF
SW722 TUNER/BAND ON—OFF
SW723 TAPE ON—OFF
SW724 VIDEO/AUX ON—OFF
SW725 PRO LOGIC ON—OFF
SW726 VIRTUAL ON—OFF
SW727 Q-SOUND ON—OFF
SW728 CD PAUSE ON—OFF
SW729 CD CLEAR ON—OFF
SW730 RANDOM ON—OFF
SWM 3 FOOL PROOF ON—OFF
SWM 4 F.A.S. ON—OFF
SWM 5 CAM ON—OFF

DESCRIPTION

(S)(G)(D)
(1) (2) (3)

2SA1015 GR
2SC535 C
2SD468 C
KRA102 M
KRA109 M
KRC102 M
KRC104 M

FRONT

VIEW

ECB

KRC107 M
KTA1266 GR
KTA1268 GR
KTA1271 Y
KTC3199 GR
KTC3200 GR
KTC3203 Y

FRONT

VIEW

BCE

2SD2012
KTA1273 Y

Figure 9 TYPES OF TRANSISTOR AND LED

– 9 –

FRONT

VIEW

333YTH2

CD-C452/C452C

5ms

0.50 V

1

IC1 20 F.E

5ms

5.0 V

2

IC1 54 DRF

WAVEFORMS OF CD CIRCUIT

STOP PLAY

FOCUS SERCH

0.5ms

6

10.0 V
JP+

0.5ms

10.0 V

7

JP-

0.5ms

8

3
1

0.50 V
JP

0.5ms

1.00 V

9

TE

0.5ms

3

1.00 V
HF

0.5ms

4

5.0 V
HFL

0.5ms

5

5.0 V
TES

0.5ms

1.00 V

3

HF

0.5ms

4

5.0 V
HFL

0.5ms

5

5.0 V
TES

50ms

6

10.0 V
JP+

50ms

10.0 V

7

JP­50ms

0.50 V

8

JP
50ms

1.00 V

9

TE

CUE

1
2

3

REVIEW

1
2

3

CUE

10

11

10

11

12

20ms

1.00 V
SPO

20ms

2.00 V
CLV+

50ms

1.00 V
SPO

50ms

2.00 V
CLV+

5s
100mV
SLD

PLAY

NORMAL DISC
TN0=01

PLAY

TCD-712 (140mm)
TN0=01

PLAY

TCD-712

0.5ms

10.0 V

6

JP+

0.5ms

10.0 V

7

JP-

0.5ms

0.50 V

8

JP

0.5ms

9

1.00 V
TE

50ms

10.0 V

6

JP+
50ms

10.0 V

7

JP­50ms

0.50 V

8

JP
50ms

1.00 V

9

TE

REVIEW

12

0.5s
100mV
SLD

1

1

– 10 –

1

2

3

4

5

9
8

6

7

20

12

13

242530

31

3222

34

35

36

10 11

272628

29

PU-IN SW

XL1

XIN

LD0

FIN2

JP–

CV+

SLC

SL1

FIN1EF

TO

FD

SPO

NC

SLD

SL–

SL+

DRF

CL

DAT

CE

VCC1

6

+5V

PICKUP IN

SW4

FOCUS COIL

TRACKING COIL

M1

DISC

MOTOR

M

M

M2

SLED

MOTOR

PICKUP UNIT

9

IC2

LC78623D

SERVO/SIGNAL

CONTROL

+B1

IC3

M56748FP

DRIVER

IC1

LA9241M

SERVO AMP.

6

1

9

5

+B1

( TO IC601 )

RES. CQCK.

COIN SQOUT.

RWC. WRQ

~

~

~

CL, DAT, SELIAL CONTROL/CE

Q93

Q91

SL+. SL–. DRF

7
3

9

8

7

6

5

4

3

2

1

6

5

GND (D)

MECHA UP

GND (D)

DISK NO.

OPEN/CLOSE

GND (D)M–M+

GND (M)

9

8

7

6

5

4

3

2

1

CNP10

M

+5V

62

64 45 3623 43

37

38

39

40

24

25

10 10

265853

101220

324043

44

5352515431302923271615

4144

Q1

+5V

+7.3V

Q52 +7.3V (+B1)

+12V (+B5)

CNP11

REGULATOR

TO MAIN SECTION

IC81

TA7291S

LORDING MOTOR

DRIVER

XOUT

EFMO

EFMIN

CLV+

JP–

CONT2

CONT3

CONT1

RCHO

RVSS

LVSS

LCHO

VVDD

VDD

LVDD

RVDD

XVDD

SW1

OPEN/CLOSE

SW2

MECHA UP

SW3

DISC No.

M3

LOADING

SOLM1

TO DISPLAY

SECTION

CNS10

6

5

CNP11

651

3

52

CNP11

CD-C452/C452C

Figure 11 BLOCK DIAGRAM (1/3)

– 11 –

CD-C452/C452C

3

4

N

FM&AM LOOP ANT

FM BPF

BF301

1

234

AM TRACKING

IC301

FM FRONT END

TA7358AP

57

FM

OSC

FM RF FM OSC

L302

T302

AM ANT.

8

L303

Q302

OSC BUFF

6

9

FM IF

T301

AM BAND
COVERAGE

CF301

FM +B

FM OSC

FM IF IN

VT

SWITCHING

Q344

1

AM MIX

AM IF

3

24

AM OSC IN

FM

+B4

T351

AM+B

6

5

AM IF

GND

FM/AM IF

IC303

LA1805

2223

AM RF IN

X352

4.5MHz

20

1

OSC

PLL CONTROLLER

7

+B4

21

FM+B

22

LC72131

10

ST

FM DET

7

STEREO

15 16

IC302

VR351

MPX VCO ADJ

T352

FM DET

20 13 15

VCO

MPX IN

DET OUT

FM IN

AMIN

DI

CE

11

4

3

5

MO/ST

FM/AM

111617

SWITCHING

VOLTAGE

REGURATER

CL

DO

6

17

21

L

R

FM/AM

Q343

ST

MONO/ST

9

10

FM

+B4

FM

FROM CD SECTION
CNP11

TAPE 1

PB HEAD

L-CH

R-CH

TAPE 2

REC/PB
HEAD

L-CH

R-CH

ERASE
HEAD

P.B

CNS11

REC

AC BIAS

651
52
3

SWITCHING

Q103



~

Q106

BIAS
OCS

Q107
Q108

L (T1)

R (T1)

L (T2)

R (T2)

L NF
R NF

POP REDUCE

L REC

R REC

REF

SWITCHING

Q128
L104

PLAYBACK&RECORD/

PLAYBACK AMP.

IC101

AN7345K

P.B.

L

R

H/N

T1/T2

1915

SWITCHING

Q111

13

21

20

18

17
10

1

24

2

23

3
4

T1/T2

6

REC

9

16

14

NOR/
HIGH

12

Q109 Q110

SWITCHING

L

4

R

5

L

REC

7

R

8

L NF
R NF

ALC

SWITCHING

+B4

Q124

JK601

VIDEO/AUX

L

AUX

R

TAPE

TUNER

CD

Q121
Q122

MUTING

P.B

BIAS
Q126

REC

T1/T2

+B4

BIAS

+B4

18

8

34

CL

38

CL

35

DATA

DOLBY PRO LOGIC

37

DATA

36

31

DECORDER

ENABLE

33

42

19 181716

20

FLOUT

FROUT

QS7777PF
Q-SOUND

6

LT-IN

44

45

IC501

LV1035M

21

IC401



RT-IN

R-OUT

23

31 32

X501

COUT

RLOUT

L-OUT

24

FLIN

FRIN

CL

2

L

52
60

R
L

53
59

R

L

54
58

R

L

55
57

R

LTI

C-OUT

9

42

C-IN

41
40

Figure 12 BLOCK DIAGRAM (2/3)

– 12 –

CD-C452/C452C

T

L

9

10

R

M

FM/AM

WITCHING

Q343

OLTAGE
GURATER

7

ST FM

+B4

MONO/ST

FM

FL701

DISPLAY

2

1~

SWM3

FOOL PROOF

SWM4

F. A. S

SOLM1

SOLENOID

SWM5

CAM

3

Q707~
Q709
LED701~
LED706

Q701

6
1

80

72
71
70

~

65
64

~

61

Q705
Q706

3330 31 32

TAPE REC

TAPE BIAS

9

8

7

~

~

SYSTEM CONTROL
MICROCOMPUTER

60

57

T1 RUN PLSE

TAPE MECHASTOP

CD DSP RWC

CD DSP WRQ

T1/T2

CD DSP CQCK

IC701

IX0224AW

VDD

D.P.CE

R MUTE

TAPE FP

+B2

+B2

CD DSP RES

RESET

CD DSP SQOUT

CD DSP COIN

16151413121110

F-MUTE

TAPE SOL

TAPE MOTOR

3

RX701

2

UNSWITCH
+B1

MEMORY
BACK UP

T2 RRUN PLSE

CD UP DOWN/DISC NO

CD T/T OPEN/CLOSE

POWER

C-MUTE

CD SL–

1

L-CH INPUT

R-CH INPUT

2423222120191817

25

~

27
29
30
33
34
35
36
37
38
39
40

42 41434445464748495051 4352535455565859

CD SL+

CD PUIN

Q605

CL
DE
DI
DO
DRF

AVDD
AVREF

VDD
+B2

XL701

4.19MHz

SYSTEM STOP

RESET

RESET

Q704

KEY

SW701
SW730

Q905

~



TO CD SECTION
TO CD SECTION

TO POWER SECTION
+B5

PHM1

TO CD SECTION

TO CD SECTION

+B1

–

M

Q705
Q706

ZD701

+

M901
FAN MOTOR

VIDEO/AUX

R-OUT

23



OGIC

R

31 32

X501

181716

COUT

JK601

L
R

24

RLOUT

L-OUT

FRIN

TAPE

TUNER

CD

FLIN

AUX

PRESET GRAPHIC EQUALIZER

+B4

CLDICE

23

24 25 56

L

52
60

R
L

53
59

R
L

54
58

R
L

55
57

R

LTIN

C-OUT

9

42

C-IN

41
40

VDD

AUDIO PROCESSOR

49 6348 64 26

RTIN

10

41

7

IC601

LC75396E

GRAPHIC EQUALIZER

VSS

4425436

+B1

+B4

+B5

+B2

38

8

+7.3V

+12V (ANALOG)

+12V (MOTOR)

+5.6V

39

11

40

Q710

37

12

9

VOLUME

44

RRIN

X-BASS

VOLTAGE

REGULATOR

Q820
Q822

VOLTAGE

REGULATOR

Q824
Q825

Q823
Q826

VOLTAGE

REGULATOR

Q603
Q604

36

OUT
REAR

20
28

CENTER

R

17
31

L

3018

CIN

Q601
Q602

F-MUTE

IC471
NJM4558L
PRE AMP.

FRONT

R-IN

L-IN

ZD801

H/P MUTE

Q671 Q672
Q673 Q674

+B4

8

3
5

4

14
10

STK40704

POWER AMP.

–B

2

1

Q801

VOLTAGE

REGULATOR

NJM4560L

HEADPHONE AMP.

REAR-OUT

1
7

CENTER

OUT

12

IC901

15

+B

3

D803 ~ D806

IC681

3
5

Q903

Q901 Q902

FRONT

L-OUT

6
7

R-OUT

D801

D807

~



D809

+B4

8

1
7

4

SO801

POWER TRANSFORMER

PRE OUT

SO901

SPEAKER TERMINAL

T.F

JK601

REAR OUT
CENTER OUT

+
–

FRONT SPEAKER

–
+

SUPPLY CORD

AC 120V/60Hz

JA901
HEADPHONES

AC POWER

Figure 13 BLOCK DIAGRAM (3/3)

– 13 –

CD-C452/C452C

0

A

CNS1B

5

K

4

B

E
A

3
2

B

1

F

CNS1A

1
2
3
4
5

K

1

A

2

B

3

E

4

F

5

CNP1

9

C

LD

MON

K
E
B
LD GND

A
F

2200P

C

LT0H30M1

D

ACTUATOR

1M

2200P

1M
TR+
FO+

FO–
TR–

PICKUP UNIT

E

F

M1

DISC

MOTOR

M2

SLED

MOTOR

SW4

PICKUP

IN

5

K

4

E
A

3
2

B

1

F

1

TR–

2

TR+

3

FO+

4

FO–

5

GND

6

PD

7

VR

8

LD

CNS2B

11
2
3
4
5
6
7
8

CNP3A

CNS3B

6

6

5

5

4

4

3

3

2

2

1

1

CNS2A

2
3

4

5

6

7
8

CNP2

CNS3A

6
5
4
3
2
1

1
2
3
4
5
6
7
8

CNP3

SP+

6

SP–

5

SL_+

4

SL_–

3

CD_PUIN

2

CD_GND

1

TR–
TR+
FO+
FO–

GND

PD
VR
LD

+

M

–
+

M

–

C15

0.01

C2

0.01

R2
1K

1.5V

C4

0.1/50

C54

0.001

R12
100

R131KC9

R14
27K

R16

3.3K

R22

22K

C12

0.1

C1

4.2V

R10

2.2K

R11

6.8K

47/16

R9

0.047

R15
12K

8

R20

R21

Q1
KTA1266 GR

4.8V

R8
15K

100K

TE
C5

0.033
C6

0.033

C7

0.1/50

C8

0.068

C10
180P

R17
33K

1K

R19

22K

C36
100/16

+B +B

C3

1/50

C34

R1
22

2.4V

FIN2

1

2.4V

FIN1

2

2.5V

E

3

2.5V

F

4

2.4V

TB

5

2.5V

TE–

6

2.5V

TE

7

2.5V
TESI

8

2.5V
SCI

9

2.4V

TH

10

2.5V

11

2.5V

TD–

12

2.5V

TD

13

2.5V

JP

14

2.5V

TO

15

2.5V

FD

16

R18

C11

15K

0.1

1K

1
2
3
4
5
6
7
8
9

10
11
12
13
14
15
16

17
18

0.33/50
C32

0.01

C33

0.47/50

R46

560

0V

4.2V

4.8V

REF

REF

REF

–

1

2.5V

2.5V
0V

2.5V

2.5V
2V
2V
0V
0V
0V
0V
2V
2V

2.5V

2.5V
0V

4.7V
0V

2.2V

1V

LDS

BHI

PHI

LDO

–

VCC1

+

RF

–

+

–

–

FE1

+

+

REF

VCR

VCR

–

+

REF

REF

+

–

REF

–

+

GEN

REF

+

FD–

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

2.5V

–

VCR

+

VCR

–

+

+

REF

–

TGL1

+

–

THDL

JP

FSC

FOSTA

REF

+

–

TO

GEN

+

REF

–

+

REF

GEN

–

REF

+

–

AGND

FE–

FEFAFA–

0V

2.5V

2.4V

2.5V

2.5V

C13

330P

R23

10K

R26

82K

C14

0.01

R25

R24

1.5K

47K

0V

36

0V

35

0V

34
33

2.5V
32

2.5V

1.8V

31
30

1.8V
29

0V

28

0V
0V

IC3

27

0V

26

M56748FP

2V

25

2V

24

2.5V

23

2.5V

22

2.5V

21
20

4.7V

FOCUS/TRACKING/SPIN/SLIDE DRIVER

19

0.7V

C31

220/6.3

1V

2.5V

VR

LF2

+

–

REF

+

–
–

+

+

–

IC1

LA9241M

SERVO AMP.

VCC
+

–

+

–

REF

GL

FSTA

S.Q.R

THD

FE1

REF

REF

–

+

–

+

REF

SPG

SPI

SP

2.5V

2.5V

2.5V

R28 10K

C16

0.0047

R31

R27

1.2K

39K

R48
10K

+B

C30

0.1/50

2.5V

4.8V0V0V4V4V

FSS

REF1

VCC2

2

EFBAL

DEF

FOSTA

HFL

TOSTA
2FREQ

DRF

LASER
FSTA

8/12CM
SLOF

REF

REF

JP

–

+

10

SPO

SP–

2.5V

2.5V

C17

0.001

R29 56K

R30

6.8K

C18

0.47/50

4.8V

SLEO

2.5V

+

–

+

–

REF

R33

1.2K

DRF

12

C20

REF

47/16

CE

CV–
CV+

JP–
JP+

JPCLO

SLOF

OR

R32
10K

R34
22K

C84

0.001

DAT

LATOH

SLOF

SLOF

C19

SLD

1/50

2.4V
49505152535455565758596061626364

CL

CLK

FSC

CE

REF

CL

3

REF

RF

4

5

+

–

+

–

SL+

SL–

2.2V

2.2V

2.5V

0V

DEF

C21

TBC

DGND

-

+

SLC

RFS–

–

+

RFSM

CV+
CV–

SLOF

HFL
TES

TOFF

TGL
JP+
JP–

0V

0.0033

R35
220K

R45

4.7K

0V

48

C29

4.7/50

C28

R40

5.6K

HF
TP1

C24

2.2P

C27

0.001

C26

0.033

R41
47K

C25
27P

R43
56K

R38
470

0.1

R44
33K

R42
47K

R39
1K

C2

0.

47

2.5V

2.5V

46

0V

45

2.4V

SLI

44

43

2.5V

2.4V

42

41

1.5V
0V

40

0V

39

4.8V

38

0V

37

0V

36

4.8V

35

4.8V

34

0V

33

6

R36
220K

7

R37
82K

D3

RL104A

D2

RL104A

C35
1/50

D1
1SS133

D4
RL104A

G

H

• The numbers 1 to 12 are waveform numbers shown in page 10.

CD MOTOR PWB-E

• NOTES ON SCHEMATIC DIAGRAM can be found on page 9.

1

23456

Figure 14 SCHEMATIC DIAGRAM (1/10)

– 14 –

CNP12

CO IN(DSP)

WRQ(DSP)

RWC(DSP)

123

CNP11

D1
1SS133

C44

100P

C45

100P

C47

100P

C22
220P

C23

0.0027

R53

1.2K

C74

220P

C73

220P

R73
390

R74
390

C43

330/6.3

C48

100P

C49

100P

C81

47/16

C57

0.001

D4
RL104A

R62 1K
R63 1K

C38

0.01

R61 1K

R57 1K

R60
1K

R52
27K

C40

0.047

C39

0.047

R50
680

R90 1K

R89 1K

R83

3.9

C83

0.022

D82

1SS133

D81

1SS133

C72
10/50

C71
10/50

R93
220

R88 1K

C28

0.1

CNP10

R51

3.3M

R42
47K

R44
33K

R39
1K

IC2

LC78623D

SERVO/SIGNAL

CONTROL

C46

100P

C53

0.022

R47

10K

C37

0.022

Q91
KTA1271 Y

Q93
KRC102 M

R87
10K

R86

2.2K

D91
1SS133

R82

3.3K

C82
47/16

L61

0.82µH

C51
100/16

ZD61

MTZJ5.6B

R66
220

R64
22

C52

100/16

Q52
KTC3203 Y

C56

0.022

R72

2.7K

R71

2.7K

C50

0.022

R55
150

R81

2.7K

R85
56
(1/2W)

C75

0.001

11 12 13

6789

10

14

12345

1221

1

2

3

4

5

6

10

9

8

7

6

5

4

3

2

1

10

9

8

7

6

5

4

3

2

1

6

1
2
3
4
5

46

47

49

5660

61

1

13

24

38
37

36
35
34
33

323130292827262523222120191817

16

15

14

12

11

10

9

8

7

6

5

4

3

2

64

63

62

59

58

57

555453

52

51

50

39

40

41

42

43

44

45

48

123456789

R59 1K

R58 1K

12V

6.5V

0V0V0V

6.4V1V6.5V

6.5V

2.9V

BIM5

FSEQ

EMPH

CONT5

C2F

TEST3

LVSS

MUTEL

MUTER

SBSY

EFLG

CD SECTION

UP/DOWN

DISC NO.

OPEN/CLOSE

PUIN SW

SLD–

SLD+

D_GND

DRF (ASP)

RES(DSP)

CQ CK(DSP)

SQ OUT(DSP)

CO IN(DSP)

WRQ(DSP)

RWC(DSP)

UP/DOWN

GND(D)

DISC NO.

OPEN/CLOSE

GND(D)

M+

GND(M)

SOL

GND(D)

CNS10

SW3
DISC NUMBER

CNS5

SW2
MECHA UP

SW1
OPEN
CLOSE

SENSOR
PWB-F

CD SERVO PWB-C

M3 T/T
UP/DOWN
LOADING

LOCK

SOLM2
SOLENOID

0V

12V

CD_LD_M–

CD_LD_M+

R-CH

TO MAIN PWB

P16 2-A

CNS11

A_GND

L-CH

D-GND

7.3V

M_12V

6.5V

5.5V

CD_LCH

4.9V

+5V

A_GND

CD_RCH

XL1

X-TAL

GENERATOR

4M

16M

/RES

/CQCK

COIN

SQOUT

RWC

WRQ

FSX

PW

SFSY

SBCK

TEST11

U-COM

INTERFACE

SUB-CODE

XVSS

XIN

XOUT

XVDD

RVDD

RCHO

RVSS

LCHO

LVDD

NC

TEST4

TEST1

1BIT
DAC

4FS

DIGITAL

FILTER

DOUT

DIGITAL

OUT

ERROR COERECT

FLAG CONTROL

VCO CLOCK

OSC CONTROL

SLICE LEVEL
CONTROL

SYNC-DETECT

EFM DEMODULATE

EXTERNAL

OUTPUT

CLV

DIGITAL SERVO

CONT4

CONT3

CONT2

CONT1

VDD

PCK

JP–

JP+

TGL

TOFF

DEF1

PDO

VVSS
ISET

VVDD
FR
VSS
EFMO
EFMIN
TEST2
CLV+
CLV–
V/P
HLF
TES

SERVO

COMMAND

2KX8

RAM

M

TA1

/CS

TEST5

0V

0V

12V

3

2

1

IC81

TA7291S

LOADING MOTOR DRIVER

TO DISPLAY PWB

P19 11-A

CNS12

+B

+B

+B

+B

+B

+B

+B

+B

+B

–

+

M–

0V

0V

0V

1.9V

4.8V
0V
0V

2.5V

2.5V
0V
0V
0V

4.8V
0V
0V

0V

0V

0V

0V

4.8V0V2.5V

0V

0V0V0V

4.8V

2.5V

0V

0V

4.8V

4.8V

2.4V

2.5V

4V4V4V0V0V

0V

2.4V0V2.4V

0V

0V

0V0V0V

0V

4.8V

4.8V

0V

2.2V

0V

2.1V

2.2V

4.8V

4.5V
2V
0V

2V

4.5V

0V

0V

CD SIGNAL

11

CD-C452/C452C

7

8 9 10 11 12

Figure 15 SCHEMATIC DIAGRAM (2/10)

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