Sharp CD-C452 User manual

– 1 –
CD-C452/C452C
No. S4825CDC452//
Illustration: CD-C452/C452C
CONTENTS Page
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)
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.
Manufactured under license from Dolby Laboratories Licens-
ing Corporation. DOLBY, the double-D symbol and
"PRO LOGIC" are trademarks of Dolby Laboratories Licens-
ing Corporation.
SERVICE MANUAL
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
SHARP CORPORATION
This Service Manual is for the CD-C452/452C, which is a minor-
modification 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
Page
OPERATION MANUAL .................................................... 5
REMOVING AND REINSTALLING THE MAIN PARTS... 10
ADJUSTMENT ............................................................... 12
TROUBLESHOOTING
(CD CHANGER CONTROL / CD SECTION)................ 34
FUNCTION TABLE OF IC.............................................. 38
FL DISPLAY................................................................... 44
 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.

CD-C452/C452C
– 2 –
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
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.
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
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
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
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)
Specifications for this model are subject to change without prior notice.
SPECIFICATIONS
CD-C452/C452C
CP-C452

– 3 –
CD-C452/C452C
NAMES OF PARTS
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
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
CD-C452/C452C
1234
16 17 18 19 20
21
22
23
24
25
2930 31 32 33 34 26 2728
36
35
37 38
MEMORY ST
kHz
MHz
1 2 3
REC SLEEP X-BASS
56789
101112
13
14 15
1
2
3
4
5
6

CD-C452/C452C
– 4 –
Speaker Section
Front Speaker
1. Super Tweeter
2. Tweeter
3. Woofer
4. Bass Reflex Duct
5. Speaker Wire
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:
CP-C452 1
2
3
4
5
Left speaker Right speaker
1
2
3
4
5
6
9
710
11
12
13 14 15 16 17 18
19 20 21 22
25
26
27
28
23
24
29
8

– 5 –
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 control Control remoto
RIGHT
RATED SPEAKER IMPEDANCE:
6 OHMS MIN.
LEFT
SPEAKERS
FM
AM
LOOP
ANTENNA
POWER
POWER
15
15
Sound control
Control del 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 Reproducción 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

CD-C452/C452C
– 6 –
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.Takeoffnylonbandsorwireholderswherethey need to
beremovedwhendisassemblingtheunit.Afterservicing
theunit,besuretorearrangetheleadswheretheywere
before disassembling.
4. Take suffcient care on static electricity of integrated
circuits and other circuits when servicing.
Figure 6-2
Figure 6-3
CD-C452/C452C
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 ..................... (G2) x11
8 Tape Mechanism 1. Open the cassette holder. 7-2
2. Screw...................... (H1) x5
9 Power Amp. PWB 1. Screw ..................... (J1) x3 7-3
2. Socket .................... (J2) x2
10 Turntable 1. Screw ..................... (K1) x1 7-4
2. Cover ..................... (K2) x1
11 CD Player Base 1. Screw ..................... (L1) x2 7-4
2. Guide ..................... (L2) x2
12 CD Servo PWB 1. Screw ..................... (M1) x1 7-5
2. Socket .................... (M2) x4
13 CD Changer 1. Screw ..................... (N1) x4 7-6
Mechanism
14 CD Mechanism 1. Screw ..................... (P1) x1 7-6
STEP REMOVAL PROCEDURE FIGURE
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.
CD-C452/C452C
Figure 6-1
( B1 ) x2
ø3 x8mm
( B1 ) x2
ø3 x8mm ( B1 ) x2
ø3 x8mm
Top Cabinet
Side Panel
(Right)
Back Board

Side Panel
(Left)
( A1 ) x2
ø3 x12mm
( A1 ) x2
ø3 x12mm
CD Tray Cover
CD Player Unit
( D1 ) x2
ø3 x10mm
( D1 ) x7
ø3 x8mm
( C3 ) x1
ø3 x8mm
Hook
( C1) x3
( C2 ) x1
( D2 ) x1
( C4 ) x2
Back Board

Main PWB
Front Panel
1
1
2
A
Pull
(C2) x1
LOCK 
LEVER
< A >

– 7 –
CD-C452/C452C
Figure 7-1
Figure 7-2
Figure 7-3
Be careful when installing the CD changer mechanism.
InstalltheCDchangermechanismontheCDplayerbaseafter
the shift lever has been set in the highest position.
Figure 7-4
Figure 7-5
Figure 7-6
( L1 ) x1
ø3 x10mm
( L1 ) x1
ø3 x10mm
( K1 ) x1
ø3 x10mm
Washer
Turntable
CD Player Base
( K2 ) x1
( L2 ) x1
( L2 ) x1
Loading chassis
( M1 ) x1
ø3 x10mm
( M2 ) x2
( M2 ) x2 Loading chassis
CD Servo PWB
( N1 ) x4
ø3 x12mm
( P1 ) x1
ø2.6 x10mm
CD Changer
Mechanism
CD Mechanism
Shift Lever
CD Player Base
Display 
PWB
Switch PWB
Open
Front Panel
( G2 ) x3
ø3 x10mm
( G2 ) x8
ø3 x10mm
( H1 ) x5
ø3 x10mm
( G1 ) x1
Tape
Mechanism Cassette
Holder
(Left/Right)
( J1 ) x3
ø3 x12mm ( J2 ) x1
( J2 ) x1
Power Amp. 
PWB
Power 
Transformer
( E2 ) x2

( E3 ) x1

(E5) x1

( E4 ) x1

( E1 ) x1
ø3 x10mm
( F1 ) x2
ø3 x8mm
Main PWB
Push
Push
Front Panel
Tape
Mechanism
Power Amp. 
PWB

CD-C452/C452C
– 8 –
Screwdriver
Net
( A1 ) x1
Baffle Board
( A2 ) x1
Woofer
Tweeter
( A3 ) x2
ø3 x10mm
( A5 ) x2
ø3 x10mm
( A4 ) x4
ø4 x14mm
Woofer
Tweeter
Super
Tweeter
CP-C452
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
STEP REMOVAL PROCEDURE FIGURE CP-C452
Figure 8-2
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.
Figure 8-1

– 9 –
CD-C452/C452C
•The indicated voltage in each section is the one measured
by Digital Multimeter between such a section and the chas-
sis 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.
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
electrolyticcapacitor,theexpression“capacitance/withstand
voltage” is used.
(CH), (TH), (RH), (UJ): Temperature compensation
(ML): Mylar type
(P.P.): Polypropylene type
•Schematic diagram and Wiring Side of P.W.Board for this
model are subject to change for improvement without prior
notice.
REF. NO DESCRIPTION POSITION POSITION
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
REF. NO DESCRIPTION
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
2SA1015 GR
2SC535 C
2SD468 C
KRA102 M
KRA109 M
KRC102 M
KRC104 M
KRC107 M
KTA1266 GR
KTA1268 GR
KTA1271 Y
KTC3199 GR
KTC3200 GR
KTC3203 Y
ECB
(S)(G)(D)
(1) (2) (3)
FRONT
VIEW
BCE
(D)(G)(S)
FRONT
VIEW
2SD2012
KTA1273 Y
Figure 9 TYPES OF TRANSISTOR AND LED
333YTH2
FRONT
VIEW

CD-C452/C452C
– 10 –
WAVEFORMS OF CD CIRCUIT
3
5ms
0.50 V
IC1 20 F.E
1
5ms
5.0 V
IC1 54 DRF
STOP PLAY
FOCUS SERCH
1
3
5
4
2
6
7
8
9
10
11
3
4
5
6
7
8
9
6
7
8
10
11
12
9
6
7
8
9
12
0.5ms
1.00 V
HF
0.5ms
5.0 V
HFL
0.5ms
5.0 V
TES
1
2
3
CUE
0.5ms
1.00 V
HF
1
2
3
0.5ms
5.0 V
HFL
0.5ms
5.0 V
TES
REVIEW
50ms
10.0 V
JP+
CUE
50ms
10.0 V
JP-
50ms
0.50 V
JP
50ms
1.00 V
TE
0.5ms
10.0 V
JP+
0.5ms
10.0 V
JP-
0.5ms
0.50 V
JP
0.5ms
1.00 V
TE
REVIEW
50ms
10.0 V
JP+
50ms
10.0 V
JP-
50ms
0.50 V
JP
50ms
1.00 V
TE
0.5ms
10.0 V
JP+
0.5ms
10.0 V
JP-
0.5ms
0.50 V
JP
0.5ms
1.00 V
TE
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
5s
100mV
SLD
1
0.5s
100mV
SLD
1

– 11 –
CD-C452/C452C
Figure 11 BLOCK DIAGRAM (1/3)
1
2
3
4
5
9
8
6
7
20
12
13
24 25 30
31
3222
34
35 36
10 11
27 26 28 29
PU-IN SW
XL1
XIN
LD0
FIN2 JP–
CV+
SLC
SL1
FIN1 E F
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
95
+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
10 12 20
32 40 43 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
6
5
1
3
52
CNP11

CD-C452/C452C
– 12 –
Figure 12 BLOCK DIAGRAM (2/3)
6
5
1
3
52
CNS11
L
JK601
VIDEO/AUX
R
L
R
R
L-CH
R-CH
PB HEAD 1
2
3
4
L NF
L (T1)
R (T1)
L (T2)
R (T2)
R NF
4
5
13
21
24
23
18
17
10
1915
12
14
16
20
H/N
67
8
9
T1/T2
POP REDUCE
L REC
R REC R NF
REC
L NF
P.B.
REC
L-CH
R-CH
REC/PB
HEAD
ERASE
HEAD
BIAS
OCS
REF ALC
HIGH
NOR/ T1/T2
1GND
345
1
X352
4.5MHz
OSC
7
STEREO
FM/AM
SWITCHING
ST
ST
1
23457 8
6
FM IF
OSC BUFF
AM IF
FM IF IN
VT
FM RF FM OSC
FM
OSC
FM IN
AMIN
FM
5
3
AM MIX AM IF 6
9
FM/AM
FM+B
21 20 13 15
10
111617
MONO/ST
DET OUT MPX IN
24 2223
AM OSC IN
AM+B
AM RF IN
FM DET VCO
FM DET
MO/ST
FM
+B4
9
AM TRACKING
AM BAND
COVERAGE
+B4
L
R
PLAYBACK&RECORD/
PLAYBACK AMP.
IC101
AN7345K
L
RP.B
IC301
FM FRONT END
TA7358AP
FM BPF
FM/AM IF
IC303
LA1805
R
R
L
L
L
TAPE
AUX
TUNER
CD
FROM CD SECTION
CNP11
Q128
L104 Q124 Q126 BIAS
Q103

Q106
~
P.BREC
AC BIAS
Q107
Q108 Q111
Q109 Q110
T1/T2
MUTING
Q121
Q122 REC
+B4
L
R
Q344
7
6
CE
DI
CL
DO
22
10
20 15 16
21
17
11
Q343
T351 T352
VR351
CF301
T301
L303
Q302
L302
T302
AM ANT.
IC302
LC72131
PLL CONTROLLER
FM
MPX VCO ADJ
TAPE 1
TAPE 2
R
L
FM OSC
BF301
SWITCHING
SWITCHING
SWITCHING
SWITCHING
SWITCHING
FM&AM LOOP ANT
2
3
52
60
53
59
54
58
55
57
4
CL
VOLTAGE
REGURATER
+B4
SWITCHING BIAS
FM +B
LTI
N
RT-IN LT-IN
FLOUT
FROUT
COUT
RLOUT
FLIN
FRIN
L-OUT R-OUT
CL
+B4
+B4
CL
DATA
DATA
ENABLE
X501
8
18 45 44 23 24
IC501
LV1035M
DOLBY PRO LOGIC
DECORDER
38
35
37
36
42
6
33
9
31 32
34
20
19 18 17 16
42
41
40
IC401
QS7777PF
Q-SOUND

31
C-OUT
C-IN
21

– 13 –
CD-C452/C452C
Figure 13 BLOCK DIAGRAM (3/3)
4
L
JK601
VIDEO/AUX
R
L
R
R
REAR-OUT
CENTER
OUT
FM/AM
S
WITCHING
ST FM
9
A
M
10
MONO/ST
S
T
FM
1
7
12
+12V (ANALOG)
+B4
+12V (MOTOR)
+5.6V
+B5
+B2
L
R
OUT
IC471
NJM4558L
PRE AMP.
+B4
+B4
+B4
PRESET GRAPHIC EQUALIZER
VDD
X-BASS
VSS
GRAPHIC EQUALIZER
VOLUME
20
28
REAR
CENTER
R
R
L
L
L
TAPE
AUX
TUNER
CD
7
Q343
VOLTAGE
REGULATOR
VOLTAGE
REGULATOR
VOLTAGE
REGULATOR
+B1
JA901
HEADPHONES
M901
FAN MOTOR
+7.3V Q820
Q822
Q824
Q825
Q823
Q826
IC601
LC75396E
AUDIO PROCESSOR
23
52
60
53
59
54
58
55
57
49 6348 64 26
4
42
5
43
6
44
24 25 56
CL
DI
CE
V
OLTAGE
E
GURATER
+B4
25
27
29
30
33
34
35
36
37
38
39
40
42 41434445464748495051 4352535455565859
60
65
70
57
2423222120191817
80
72
71
16151413121110
9
~
6
1
~
~
~
78
3RX701
Q707~
Q709
LED701~
LED706
2
1
SYSTEM STOP
DO
DRF
DI
DE
CL
RESET
XL701
4.19MHz
AVDD
AVREF VDD
+B2
KEY
SW701

SW730
TO POWER SECTION
+B5
PHM1
RESET
Q705
Q706
ZD701
MEMORY
BACK UP
+B2
3
2
1~
3330 31 32
Q701
+B2
+B1
UNSWITCH
FL701
DISPLAY
~
61
64
~
POWER
C-MUTE
T.F
AC 120V/60Hz
AC POWER
SUPPLY CORD
VOLTAGE
REGULATOR
Q801
Q903
Q901 Q902
Q710
D807

D809
~
D803 ~ D806
ZD801
Q704
IC701
IX0224AW
SYSTEM CONTROL
MICROCOMPUTER
TO CD SECTION
TO CD SECTION
TO CD SECTION
TO CD SECTION
14
123
L-OUT
FRONT
R-OUT
10
15
R-IN
FRONT
L-IN
–B +B
IC901
STK40704
POWER AMP.
D801
12
39
9
36
11
40
8
37
10
41
7
38
+
–
+
– FRONT SPEAKER
SO901
SPEAKER TERMINAL
SO801
POWER TRANSFORMER
CD PUIN
CD SL+
CD SL–
VDD
TAPE SOL
TAPE MOTOR
TAPE MECHASTOP
TAPE FP
R MUTE
D.P.CE
T1 RUN PLSE
SOLM1
SOLENOID
SWM5
CAM
SWM4
F. A. S
SWM3
FOOL PROOF
L-CH INPUT
R-CH INPUT
T2 RRUN PLSE CD UP DOWN/DISC NO
CD DSP RES
CD T/T OPEN/CLOSE
RESET CD DSP SQOUT CD DSP COIN CD DSP RWC
CD DSP CQCK
CD DSP WRQ T1/T2 TAPE REC TAPE BIAS
Q603
Q604 Q601 Q602
F-MUTE F-MUTE
3018
CIN
RRIN
RTIN
LTIN
17
31
R
L
COUT
RLOUT
FLIN
FRIN
L-OUT R-OUT
X501
23 24
OGIC
E
R
9
31 32
18 17 16
42
41
40
C-OUT
C-IN
3
5
4
8
8
3
5
1
7
IC681
NJM4560L
HEADPHONE AMP.
Q905
Q605
M
Q671 Q672
Q673 Q674
H/P MUTE
+B1
+
–
6
7
Q705
Q706
JK601
PRE OUT
REAR OUT
CENTER OUT

CD-C452/C452C
– 14 –
• The numbers 1 to 12 are waveform numbers shown in page 10.
Figure 14 SCHEMATIC DIAGRAM (1/10)
A
B
C
D
E
F
G
H
123456
• NOTES ON SCHEMATIC DIAGRAM can be found on page 9.
1
2
3
4
5
5
4
3
2
1
8
7
1
5
4
3
2
1
6
5
4
3
2
8
7
2
3
4
5
6
8
7
2
3
4
5
6
M
M
11
6
5
4
3
2
1
6
5
4
3
2
1
6
5
4
3
2
1
6
5
4
3
2
1
8
7
6
5
4
3
2
1
5
4
3
2
1
2200P
1M
2200P
1M
PD
VR
LD
TR–
TR+
FO+
FO–
GND
PD
VR
LD
TR–
TR+
FO+
FO–
GND
PICKUP UNIT
ACTUATOR
TR–
FO–
FO+
TR+
LD GND
LT0H30M1
C
F
A
B
E
K
LD MON
CD MOTOR PWB-E
–
+
–
+
CNP12
C33 0.47/50
C34 0.33/50
R21 22K
R22 22K
D1
1SS133
R37
82K
R26 82K
C13 330P
IC1
LA9241M
SERVO AMP.
R45 4.7K
C2
0.
0
R38
470
R46 560
C2
0.01
C1 47/16
R2
1K
C12
0.1
R14
27K
R13
1K C9 0.047
D2 RL104A
D4
RL104A
C84
0.001
R12
100
C7
0.1/50
C8
0.068
C10
180P
R15
12K
R16
3.3K
C18 0.47/50
R31
1.2K
C26
0.033
R40
5.6K
C24
2.2P
C27 0.001
C30 0.1/50
C31 220/6.3
C32 0.01
R32
10K
R33
1.2K
C19 1/50
C20 47/16
R36
220K
C21 0.0033
R35
220K
D3 RL104A
C11
0.1 R18
15K
R1
22
C35
1/50
C4
0.1/50
C14
0.01
C28
0.1
C29 4.7/50
R17
33K
R24
47K
R23 10K
R25
1.5K
R27
39K
C16 0.0047
R9 100K
R8
15K
C54 0.001
C5
0.033
R10
2.2K C6
0.033
R11
6.8K
IC3
M56748FP
FOCUS/TRACKING/SPIN/SLIDE DRIVER
C36
100/16
R48
10K
R34
22K
C3 1/50
R19 1K
R20 1K
R30
6.8K
C17 0.001
R29 56K R28 10K
R42
47K
R44
33K
R43
56K
R41
47K
C15
0.01
R39
1K
C25
27P
Q1
KTA1266 GR
123
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
17
18
16
9
6
15
14
13
12
11
10
8
7
5
4
3
2
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49505152535455565758596061626364
CD_PUIN
SL_–
SL_+
SP–
SP+
CO IN(DSP) WRQ(DSP) RWC(DSP)
CD_GND
TP1
HF
FE1
SLOF SLOF
FSC
FOSTA
TE
F
E
B
A
K
K
E
B
A
F
K
E
B
A
F
4.2V
1.5V 4.8V
CV+
CV–
SLOF
HFL
TES
TOFF
TGL
JP+
JP–
RFSM
RFS–
SLC
RF
REF
OR
REF
REF
REF
REF
SL+ SL– SLD SLEO SPO SP– SPG SPI SP AGND FE– FE FA FA– FD–
GEN
GEN
GEN
FD
TO
JP
TD–
TD
TH
REF
JP
REF
TO
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
SCI
TESI
TE
TE–
TB
F
E
FIN1
FIN2
VCC1
LDS
BHI PHI
LF2
VR
REF1
VCC2
DRF
CE
DAT
CL
CLK
DEF
SLI
DGND
REF
LDO
RF
REF
REF FE1
VCR VCR
VCR
VCR
TGL1
THDL
GL
THD
VCC
DEF
HFL
DRF
CE
CL
SLOF
FSTA
LATOH
TOSTA
FOSTA
S.Q.R
FSTA
8/12CM
LASER
2FREQ
JP+
JP–
CV+
CV–
REF
REF
JP
REF
-
+
EFBAL
FSC
SLOF
JPCLO
FSS
TBC
CNS1B
CNS1A
CNS2B CNS2A
CNP3A CNS3B CNS3A
M1
DISC
MOTOR
M2
SLED
MOTOR
SW4
PICKUP
IN
CNP3
CNP2
CNP1
+B +B
+B
+
–+
–
+
–
+
–
+
–
+
–+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–+
–
+
–
+
–
+
–
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.4V
2.5V
2.5V
2.5V
2.5V
2.4V
2.5V
2.5V
2.4V
2.4V
0V
2.2V 2.2V 2.5V 2.5V 2.5V
2.5V 2.5V
2.5V
2.5V
0V
2.5V 2.4V 2.5V 2.5V 2.5V
0V
0V
4.8V
0V
0V
4.8V
4.8V
0V
1.5V
2.4V
2.5V
2.4V
0V
2.5V
0V
2.5V
4.8V
0V
2.2V 1V 1V 2.5V 2.5V 4.8V 0V 0V 4V 4V 2.4V 0V
4.2V
4.8V
4.7V
0V
0V
0V
2V
2.5V
2.5V
2V
2V
0V
0V
0V
2V
2.5V
2.5V
0V
2.5V
2.5V
4.7V
0.7V
2.5V
0V
1.8V
2.5V
2.5V
2V
2V
0V
0V
0V
1.8V
2.5V
2.5V
0V
0V
0V
10
12
5
4
3
2
9
6
7
1
8

– 15 –
CD-C452/C452C
Figure 15 SCHEMATIC DIAGRAM (2/10)
78 9 10 11 12
12
CNP11
D1
1SS133
C44 100P C45 100P C47 100P
C22
220P
C23
0.0027
38
0
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
6
33
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
C35
1/50
R88 1K
C28
0.1
CNP10
R51
3.3M
R42
47K
R44
33K
R39
1K
5
P
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
122 1
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 55 54 53 52 51 50
39
40
41
42
43
44
45
48
123456789
R59 1K R58 1K
12V
6.5V
0V 0V 0V
6.4V
1V
6.5V 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
32
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
4.8V
0V
2.5V
0V 0V 0V 0V
4.8V 2.5V
0V 0V
4.8V
4.8V
2.4V 2.5V
4V 4V 4V 0V 0V 0V
2.4V
0V
2.4V
0V 0V 0V 0V 0V
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
– 16 –
A
B
C
D
E
F
G
H
123456
• NOTES ON SCHEMATIC DIAGRAM can be found on page 9.
Figure 16 SCHEMATIC DIAGRAM (3/10)
R529
330
R636
10K
D602
1SS133 D603
1SS133
C524 10/50
R510
18K
C521 0.33/50
R503
1K
C506 0.022
C504 47/25
C516 0.15/50
C542
220/16
C510 0.47/50
C512 4.7/50
C515 0.0033 (ML)
C503 1/50
C533 0.47/50
R509
4.7K
C551 100P
C520 0.15/50
C522 0.15/50
C527 10/50
C531
2.2/50
R511
1K
C550 100P
C537 10/50
C540 10/50
C535 10/50
C538 10/50
D516 RL104A
C539 220/16
R512
4.7K
R502
100K
C546 220P
C549 100P
C543
0.1
(ML)
C534
0.1 (ML)
C505 0.47/50
R504 1M
C525 3.3/50
C526 0.15/50
C528 4.7/50
R501
100K
C507 0.047 C508 680P
IC501
LV1035M
DOLBY PRO LOGIC
DECORDER
C514 0.082 (ML)
C517 0.082 (ML)
C509
0.1 (ML)
C529 0.47/50
C518 3.3/50
C523 10/50
C544 220/16
R506
4.7K
R507
1K
D515 RL104A
C519 0.47/50
C530 4.7/50
C536 10/50
C501
0.1
(ML)
C502 1/50
D604
1SS133
Q605
KRC104 M
R518
1K
R519
1K
C513 4.7/50
C511 0.47/50
R505
4.7K
CNP601
R637
4.7K
C562 0.022
C532 220/16
C563
0.022
R508
39K
X501
8MHz
C541 220/16
C561
0.022
R522
1K
R521
1K
R520 1K
R514
1K
R540 22K
D607
1SS133
D608
1SS1
3
R531
3.3K
R530
3.3K
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
5.84V
5.82V
5.84V
5.84V
5.84V
0V
0V
0V
0V
5.2V
5.2V
5.86V 5.86V 5.86V 5.86V 5.86V
5.86V
5.86V 5.86V
5.86V
5.86V
5.86V
5.86V
5.86V
5.86V
5.86V
5.86V
5.86V
5.86V
5.86V
5.86V
5.86V 5.86V 5.86V 5.86V 5.86V 5.86V 5.86V 5.86V 5.86V
11.69V
4.13V
3.5V
3.5V
123456789
10 11 12 13 14 15 16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
0V
33343536373839404142434445464748
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
BI601
2
6
1
3
4
5
2
6
1
3
4
5
R407 1K
R406 1K
C407
0.022
(ML)
C408
0.022
(ML)
C415
0.022
C416
0.022
C425 0.001(ML)
C427 0.082 (ML)
C43
2
0.00
2
(ML)
C43
0
0.02
2
(ML)
IC401
QS7777PF
Q-SOUND
C
1
C409 0.022 (ML)
R403 1K
R409
330
R402 1K
R401 1K
C418 0.022
C411
0.0047
C417
0.022
C412
0.0047
C410
0.022
(ML)
C426 0.012 (ML)
R404 1K R405 1K
C405
0.47/50
C406
0.47/50
C413
0.47/50
C420 4.7/50
C419
4.7/50
C421 4.7/50
C423 0.047/50
C414
0.47/50
C42
9
10/5
0
C42
8
10/5
0
C431
0.22/
5
1
1
2
3
4
5
6
7
8
9
10
11
12
131415161718192021222324
25
25
26
27
28
29
30
31
32
33
34
35
36
36
37 38 39 40 41 42 43 44 45 46 47 48
C435
47/
C436
0.022
POWER
C MUTE
M_12V
D.P CE
F MUTE
R MUTE
DO
DI
CE
QS_MO
QS_AC
QS_BYP_AR
A_GND
CL
T1/T2
TAPE REC
TAPE BIAS
VF2
–VP
VF1
P22 6-D
TO TUNER & DECK SECTION
R_BPF2 R_BPF1 S_DC_OUT C_DC_OUT R_DC_OUT L_DC_OUT VREF VCC C_OUT S_OUT R_OUT L_OUT AC_GND L_IN R_IN S_IN
VCC
DET
IREF
D_GND
S_OUT
R_OUT
L_OUT
DC_OUT
DC_OUT
D/A
NS
A/D
VDD
OSC
OSC
VSS
CLK
DATA
ENABLE
CLK
OSC
NS_BPF2 NS_BPF1
GND
C_MODE
DC_OUT
LT_IN
RT_IN
L_BPF1 L_BPF2
DATA
L_BPF3
DC_OUT3
DC_OUT4
DC_OUT2
DC_OUT1
R_BPF3
L-R_RECT
L+R_RECT
VCS_TH
VCS_1
VCS_2
VLR_2
VLR_1
VLR_TH
L_RECT
R_RECT
R-CH
A_GND
L-CH
HP_SW
D_GND
0V 0V
4V
TUN_R
TUN_L
A_12V
A_GND
TAPE_L
TAPE_R
REC_R
REC_L
M_GND
DO
T1/T2
REC_MUTE
BIAS
CL
DI
CE
D_GND
32
1
68795 2413
151013 14
11 12 16 17
D_GND
M_12V
7.3V
R-CH
A_GND
L-CH
CNS11
CNS701 CNP11
FW601
TO DISPLAY PWB
P18 5-G TO CD SERVO PWB
P15 12-C
+B
+B
+B
+B
+B
+B
+B
+B
QXAC3 QXAC4 QXAC2 QXAC1
QXAC5
QXBC1
QXBC2
QXBC3
QXBC4
QXBC5
VCC
QXCC1
QXCC2
QXCC3
QXCC4 QXDC1
QXDC2 QXDC3 QXDC4 FLIN FRIN CIN SUBIN RLIN RRIN MSC4 MSC5 MSC6
VROUT
VRIN
MSC3
MSC2
MSC1
GND
PSAVE(STRB)
MUTE(SCL)
SPREAD(SDA)
AC
AR
MO
BYP
P/S
VDD
RROUT
RLOUT
COUT
FROUT
FLOUT
–0.1V 4V –0.1V
3.6V
–0.1V 4V 0V 4.7V 4.8V 0V
4.7V 4.7V 4.7V 4.7V 4.7V 4.7V
4.7V 4.7V 4.7V 4.7V 4.7V 4.7V 4.7V 4.7V 9.4V
4.7V 4.7V 4.7V 4.7V 4.7V 4.7V 4.7V
9.4V
2.5V
0.6V
–0.1V
4.7V
4.7V
4.7V
4.7V
4.7V
4.7V
4.7V
4.7V
4.7V
5V
2.3V
4.7V
4.7V
5.4V
4.7V
5.4V
4.6V
4.6V
4.6V
3.7V
3.5V
3.4V
5.4V
4.8V
5.4V
4.7V
4.7V

– 17 –
CD-C452/C452C
Figure 17 SCHEMATIC DIAGRAM (4/10)
78 9 10 11 12
MAIN PWB-A1(1/2)
C626 0.047 (ML)
C622 1/50
IC601
LC75396E
AUDIO PROCESSOR
R628 2.2K
C621
1/50
R624 22K
C634
2.2/50 C636
2.2/50 C635
2.2/50 C633
2.2/50
R625
47K
R626 47K
R621
47K
R622 47K
Q604
KTC3199 GR
Q602 KTC3199 GR
C637
0.001
Q601 KTC3199 GR
R630 2.2K
C638
0.001
Q603
KTC3199 GR
C640
0.001 R631
2.2K
C639
0.001
R629 2.2K
C617
0.0022
(ML)
C615
0.015 (ML)
C609
0.068 (ML)
C619
0.0047
(ML)
C612 0.027 (ML)
C611
0.22/50
C662
1/50
C660
2.2/50 C659
2.2/50
C657 100P
C624 10/50
C628 10/50
C630 47/25
C625 10/50
C623 10/50
R613
33K
C613
0.027 (ML)
R605 1K R606 1K
R615
2.7K
R614
33K
R616
2.7K
C658 100P
C631 47/25 R619
1K
R618 1K
R617 1K
R627 2.2K
R623 22K
C606
0.18
(
Poiyester )
C602
0.082(ML)
C604
0.22/50
C607
0.18
(Poiyester)
C605
0.22/50
C603
0.082
(ML)
C647
390P
R603
1.8K
C648
390P
R604
1.8K
R602
27K
R601
27K
C661
1/50
R607 1K R609 1K R612 1K R611 1K R608 1K R610 1K
D606 1SS133
C654 0.047 (ML)
C656 0.047 (ML)
C655 0.047 (ML) C653 0.047 (ML)
C651 0.047 (ML) C649 0.047 (ML) C650 0.047 (ML) C652 0.047 (ML)
D601
1SS133
CNS803
D609
1SS133
D610 1SS133
D510
1SS133
D511
1SS133
C689
100P
C687
47/25
R682 100K
R694
47
C694 0.022
R693
47
R692 2.7K
R690 1K
R687
12K
R689
1K
R695
100K
R685 560
R696 100K
R688
12K
C684
47/25
C685
100P
C690
100P
IC681 NJM4560L HEADPHONE AMP.
IC471
NJM4558L
PRE AMP.
R686
560
C693
47/25
C484
0.022
C482
47/25
C480
2.2/50
C479
2.2/50
C683
47/25
C692
47/25
C691
47/25
R691
2.7K
R681
2.2K
R699
22K
R697
22K
R671
2.2K
R672
2.2K
R673
2.2K
R674
2.2K
C488
330P
C490
330P
R484
1K
R483
1K
R620
22K
D607
1SS133
C632 47/25
C646
0.022
C645
100/16
C564
0.001
C644
22/25
R633 22K
C643 22/25
C642 22/25
C681
0.047
(ML)
Q673 KTC3199 GR
Q671 KTC3199 GR
Q674
KTC3199 GR
Q672
KTC3199 GR C697
0.001
C698 0.001
C699 0.001
C696 0.001
R684 100K
R698
22K R680
22K R683
2.2K C686
100P
C682
0.047
(ML)
R632 2.2K
R634 22K
C618
22/25
D608
1SS133
R635 22K
C601
0.047
(ML)
20
19
18
17
1615
141312
11
10
98
7
6
5
4321
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
5V
4.9V
5V 5V 5V 5V 4V
–0.1V –0.1V
0V 5V 5V 5V
4.9V
5V 5V
4.9V
5V 5V 5V 5V 5V 5V 5V 10V 5V 5V 5V 5V 5V 5V 5V
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
4.9V
5V
4.8V
4.9V
5V
4.8V
4.9V
5V
4.8V
4.9V
5V
4.8V
4.9V
5V
5V
4.9V
5V
5.84V
5.82V
5.84V
5.84V
5.84V
0V
0V
0V
0V
5.2V
5
.2V
5.86V 5.86V
4.13V
3.5V
3.5V
4.9V
5V
4.8V
4.9V
5V
4.8V
4.8V
5V
4.8V
4.9V
5V
4.8V
4.9V
5V
5V
49505152535455565758596061626364
1
2
3
4
5
67
8
C427 0.082 (ML)
C432
0.0027
(ML)
C430
0.022
(ML)
C434 0.022
C433
100/16
C403 220P
C402 220P
C401 220P
C426
0.012 (ML)
ZD401
MTZJ5.1B
C429
10/50
C428
10/50
C431
0.22/50
1
2
3
4
5
6
7
8
9
10
11
12
1314
47 48
C477
100P
C471
0.047
C472
0.047
C481
47/25
R482 100K
R481
100K
R477
10K
R487
100K
R471
2.2K
R472
2.2K
R475 3.9K
R489 100K
R474
100K
R473 100K
R478
10K
C474
47/25
C475
100P
C478
100P
R476 3.9K
C473
47/25
C476
100P
1
2
3
4
5
67
8
0V
R-CH
L-CH
JK601
R5
L5
1
2
3
4
RTIN
RF1C1
RF1C2
RF1C3
RF2C1
RF2C2
RF2C3
RF3C1
RF3C2
RF3C3
RF4C1
RF4C2
RF4C3
RF5
RTOUT
RFIN
RFCOM
RFOUT RRIN RRCOM RROUT RVREF VREF LVREF CE DI CL VSS COUT LRCOM CIN LFOUT LFCOM
LFIN
LTOUT
LF5
LTIN
LF1C1
LF1C2
LF1C3
LF2C1
LF2C2
LF2C3
LF3C1
LF3C2
LF3C3
LF4C1
LF4C2
LF4C3
LSELO
LINVIN1
L4 L3 L2 L1
VDD
R1 R2 R3 R4
RINVIN1
FRONT_R
FRONT_L
A_GND
STANDBY
VIDEO/AUX
CENTER OUT
REAR OUT
PRE OUT
5
6
7
8
7.3V
(CD)
CD_GND
D_GND
A_GND
M_GND
+12V (M)
+12V (A)
VF1
–VP
VF2
+12V (M)
0V
0V
0V
0V
0V 0V 0V
0.7V 0.7V
0V 0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
TAPE_M_GND
MAIN_CHASIS_GND
C627
0.047
(ML)
C620 0.0047 (ML)
C616 0.0022 (ML)
C614 0.015 (ML)
C610
0.22/50
C608
0.068
(ML)
C600
0.047 (ML)
CHASSIS
GND TO TAPE MECHANISM CHASSIS
LUG1
TO POWER PWB
P20 1-F
CNP803
+B
+B
+B
+B
+B
+B
+B
+B
MSC5 MSC6
VRIN
MSC3
MSC2
MSC1
GND
V
E(STRB)
U
TE(SCL)
EAD(SDA)
AC
AR
MO
BYP
P/S
VDD
5.6V
5.6V
0V
11.1V
5.6V
5.5V
5.5V
5.6V
5.6V
5.6V
0V
11.1V
5.6V
5.5V
5.5V
5.6V
FM SIGNAL
RECORD SIGNAL
PLAYBACK SIGNAL
CD SIGNAL

CD-C452/C452C
– 18 –
Figure 18 SCHEMATIC DIAGRAM (5/10)
A
B
C
D
E
F
G
H
123456
• NOTES ON SCHEMATIC DIAGRAM can be found on page 9.
9
8
7
6
5
4
3
2
1
12
11
10
12
11
10
9
8
7
6
5
4
3
2
1
M
2
14
3
2
1
–
+
TAPE MECHANISM
PWB-D
2
1
R706 1K
IC701
IX0224AW
SYSTEM MICROCOMPUTER
R747 2.2K
Q707
KRC107 M
Q708
KRC107 M
Q709
KRC107 M
R758 10K
Q702
KTA1273 Y
C711 47/25
FL701
DISPLAY
Q701
KTC3199 GR
R788
1K
R797
1K
D710
1SS133
R778 100K
C716
47/25
D712 1SS133
Q703
KTA1271 Y
R787 33
R760 10K
R786 10K
R784 10K R746 2.2K
R751 1K R754 1K R755 1K
R741 1K
R753 1K R750 1K R752 1K R748 1K R749 2.2K
R744 1K R743 10K R742 2.2K
R711 1K R709 1K R705 1K
R738 1K
R713 1K R708 1K
R739
1K
R740 1K
R703 22K R702 1K R712 1K R710 1K R714 1K R719 1K
R720 1K
R701 1K
R757 10K
R782
820
R781
820
R783
820
LED706
333YTH2
LED704
333YTH2
LED702
333YTH2 LED701
333YTH2
LED703
333YTH2
LED705
333YTH2
R785 2.2K
C702 220/10
C701 0.022
R704 1K
C713 1/50
R722 10K R721 10K R779 10K
R728 8.2K
R737
10K
C705
0.001
R727 3.3K
R731 8.2K R730 8.2K
R726 1K
R732 1K
R734 1K
R735 1K
R733 1K
R723 1K
R724 1K
R725 1K
XL701
4.19MHz C703
15P
C704
18P
R736 1K
R729 8.2K
JK701
HEADPHONE
JACK
BI701
R759 1.2K
98
7
19 18 17 16 15 14 13 12 11
27 26 25 24 23 22 21 1020
87654321
40
39
40
39
38
37
36
35
414243444546474849505152535455565758596061626364
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
123456789
10 11 18 22
34
33
32
31
30
29
28
27
26
25
26
25
12 13 14 15 16 17 19 20 21 23 24
12 3456789
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
R745
1K
+B
+B
L-CH
P2 P3 P4 P5
12345
VLOAD
DO
DI
CE
CL
VDD IC REMOCON SYSTEM STOP
X1
X2
VSS
AVREF
AVDD
KEY-0
KEY-1
KEY-2
KEY-3
AVSS
RESET
CD DSP SQOUT
CD DSP COIN
CD DSP CQCK
CD DSP RWC
CD DSP WRQ
VDD
T0 T1 T2 T3 T4 T5 T6
T7
T8
S0
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12 S13 S14 S15
9G 4G 3G 2G 1G 8G
7G
6G
5G
P17
P18
P19
P12
P1
P6
P7
P8
P9
P10
P11
P14
P20 P13
P16
P15
F F P15 P16 P13 P20 P14 P11 P10 P9 P8 P7 P6 5G 6G 7G 8G P1 P12 P19 P18 P17 1G 2G 3G 4G 9G F F
MOTOR
GND
+12V
T2 RUN
FOOL PROOF
T1 RUN
SOLENOIDO
MECHA STOP
XT2
CD DSP RES
CD T.T OPEN/CLOSE
CD UP/DOWN,DISC NO
T2 RUN PLSE
QS_AC
QS_MO
DRF
CD PUIN CD SL+ CD SL–
T1/T2
TAPE SOL TAPE MOTOR D.P CE T1 RUN PLSE TAPE MECHA STOP
TAPE REC
TAPE BIAS
POWER Q-SOUND VIRTUAL PRO LOGIC
P04
F MUTE TAPE F.P. C MUTE R MUTE
VF1
–VP
VF2
TAPE REC
TAPE BIAS
C MUTE
CL
R MUTE
F MUTE
D.P CE
T1/T2
R762
10K
DOLBY PASS
DOLBY NORMAL
DOLBY PHANTOM
CE
DI
DO
POWER
QS_BYP_AR
R-CH
A_GND
HP_SW
CNP601
4.2V 24.2V
24.2V
12V
12V
12V
12V
0V
0V
0V
0V
0V0V
0V0V
8.9V
8.9V
3.8V
3
3
2
1
21
32
1
CNPM1
CNSM1
PHM1
RUN PALS
SENSOR
MM1
TAPE
MOTOR
FWM1
CNPM2
FWM2
SWM4
F. A. S
SWM5
CAM
SOLM1
SOLENOID
SWM3
F. P.
TO MAIN PWB
P16 2-C
+B
+B
0V
4.2V
0V
0V
4.2V
2.3V
1.8V
0V
4.2V
0V
4.2V
4.2V
4.2V
4.2V
4.2V
4.2V
–24V –24V –24V –24V –24V –24V –24V 4.2V 0V 4.2V 4.1V 4.2V 0.9V 0.2V 0V 4.2V 4.2V 0.2V 4.2V 0V 0V 0V 0V 0V
–27.1V
–18V
–18V
–27.1V
4.1V
0V 0V
4.3V
0V
4.2V 4.1V
4.2V
0V
4.2V
4.2V
12V 12V
2.1V
0V
4.2V 4.1V 4.2V
0V 0V
–25V
–-18V
–27.1V
–27.1V
–27.1V
–17.9V
–27.3V
–14.8V
–24V
–18.6V
–15.3V
–27.1V
–27.1V
0V
–24.2V
–24.2V

– 19 –
CD-C452/C452C
Figure 19 SCHEMATIC DIAGRAM (6/10)
78 9 10 11 12
D707
1SS133
R707
120K
R789
47K
1K
R765 3.3K
D705 1SS133
D708 1SS133
R775 2.2K
R770
1K
R764
1K
Q704
KRC102 M
R774 150
D709 1SS133
R771
100
Q706
KTC3199 GR
Q705
KTC3199 GR
R769 10K
R768
10K
82
R767
R772 1K
C708 0.01
D706 1SS133
R766 100K
R773 120
C709 100/10
ZD701
MTZJ3.3B
C710 220/10
C715 0.022
RX701
N63H380A
SW712
STOP
RD19
3.9K RD20 5.6K
RD18
2.2K
RD11
1.8K
RD10
1.2K
SW716
TUNING
DOWN
RD14
5.6K
SW710
REC
PAUSE
SW714
PRESET SW715 TUNING
UP
RD09
1K
RD15
1K RD17
1.8K
RD12
2.2K
RD21
12K
SW721
CD
SW720
MEMORY
/SET
SW722
TUNER
/BAND
SW723
TAPE SW724 VIDEO/
AUX
RD26
3.9K
RD25
2.2K
SW727
Q-SOUND
SW713
PLAY/
REPEAT
RD13
3.9K
RD24
1.8K
SW728
CD
PAUSE
SW725
PRO LOGIC
RD23
1.2K
SW729
CD
CLEAR
SW726
VIRTUAL SW730
RANDOM
RD22
1K
SW711
PRESET
RD16
1.2K
SW718
CLOCK
1K C701
0.022
C712 1/50
C713 1/50
C706 0.01
C707
3.3/50
R722 10K R721 10K R779 10K
C725 0.022
SW702
VOLUME
DOWN
RD02
1.2K RD03 1.8K
SW704
VOLUME
UP
RD04
2.2K
SW701
EQUALIZER
/DEMO
SW703
X-BASS
RD01
1K
C724
0.001
C723 150P
C722 150P C721 150P C720 150P
L701
100µH
SW719
TIMER/
SLEEP
SW717
POWER
R728 8.2K
R737
10K
C705
0.001
R727 3.3K
R731 8.2K R730 8.2K
R726 1K
R732 1K
R734 1K
R735 1K
R733 1K
R723 1K
R724 1K
R725 1K
XL701
4.19MHz C703
15P
C704
18P
R736 1K
R729 8.2K
CNS701
C730 10/50
C732
0.022 R790
100
C731
47/25 ZD710
MTZJ5.6B
Q710
2SD468 C
R792
22 R791
1.2K
DISPLAY PWB-A2
BI702
R798
10K
SW706
DISK
SKIP
RD05
3.9K
SW705
OPEN
/CLOSE
RD07
12K
SW707
DISC 1
RD08
33K
SW709
DISC 3
RD06
5.6K
SW708
DISC 2
FW701
987654321
19 18 17 16 15 14 13 12 11 1020
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
8
3
1
2
4
5
6
7
9
10
11
12
13
14
8
3
1
2
4
5
6
7
9
10
11
12
13
14
123
4.2V 0V
0V 0V 0.2V
0.2V
0.2V
0.9V
1
2
3
1
2
3
SWITCH PWB-A3
CQ CK(DSP)
CO IN(DSP)
SQ OUT(DSP)
SLD+
RES(DSP)
WRQ(DSP)
RWC(DSP)
DISC NO.
OPEN/CLOSE
D_GND
VF1
M_12V
–VP
VF2
D_GND
C MUTE
CL
R MUTE
F MUTE
D.P CE
PUIN SW
SLD–
UP/DOWN
DRF(ASP)
CE
DI
DO
POWER
R-CH
A_GND
CNP601
CNS12
5.6V
5V 11.5V
1
3
2
CNP12
FW601
TO MAIN PWB
P16 2-C
TO CD SERVO PWB
P15 7-G
+B
+B
+B
+B
QS_MO
QS_AC
QS_BYP_AR
0V
4.2V
0V
0V
4.2V
2.3V
1.8V
0V
4.2V
0V
4.2V
4.2V
4.2V
4.2V
4.2V
4.2V
FM SIGNAL

CD-C452/C452C
– 20 –
Figure 20 SCHEMATIC DIAGRAM (7/10)
A
B
C
D
E
F
G
H
123456
• NOTES ON SCHEMATIC DIAGRAM can be found on page 9.
C825 22/25
Q826
KTC3199 GR
Q824
2SD2012
Q823
2SD2012
R825
33
C827 47/25
R829
1K
R826
220
IC901
STK40704
POWER AMP.
C910
2200/50
C909 2200/50
C904
10/50 C911
100/50
C826
47/25
Q825
KTC3199 GR
R912
100
R913
100
R915 220K
R918 470
C917 47/50
C916
15P
R917 56K
R922 470
R921
10K
R923 56K
C924 15P
Q902
KRC107 M
Q903
KRC1
R
4
R932
18K
C923
47P
C915
47P
R924 1K
R916 1K
C907
10/50 C912
100/50

C918 47/50
R836 22K
C824 0.022
R837 22K
R820
47
ZD820
MTZJ8.2C
C823
47/25
Q822
KTC3199 GR
R824
560
Q820
2SD2012
R838 10K
C831 10/50
C820 0.022
R905
1K
C903
1/50 R907
1K
C902 220P
R902 68K
R901 100K
C901
1/50
R903 100K
C905 220P
R904 68K
Q901
KTA1268 GR
R910 2.2K
R914
15K
R911
10K
C977 1000/6.3 
R962 820 D902
1SS133
CNP803
POWER PWB-B
R964
R831
3.3
(1/2W)
C828 47/25
ZD822 MTZJ13C
R835
560
R827
1K R828
33K
D824
1SS133
C829 4700/25
R804
4.7
CHASSIS
GND
R805 100
C802 100/35
Q
8
K
T
C803 47/50
R803
220
Z
D
M
T
ZD801 MTZJ6.2A
R801 12K
D804
RL104A D805
RL104A
D806
RL104A
D803
RL104A
R802 220
D801
TS6
B
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
151413121110
987654321
+B
–VF
+B2
+B
+B
GND3
VF1
VF2
GND –Vcc –Vcc +Vcc
Ch1
Ch2
Ch1 Ch2 Out Out
CNS803
H:ON
L:OFF
2 Ch
30.6V
30.7V
30V
0V 0V
0V
0.3V
3.8V
12.4V
13V
18.2V
13.3V
13V
18.4V
11.6V
12.3V 12.4V 18.4V
6.9V
7.5V
7.6V
8.2V
18.4V
35.3V
18.4V
–28.3V
32
1
32
1
P17 8-H
TO MAIN PWB
FRONT_R
FRONT_L
A_GND
STANDBY
7.3V(CD)
CD_GND
D_GND
A_GND
M_GND
+12V (M)
+12V (A)
VF1
–VP
VF2
+12V (M)
–
–B
+
+
–
–0.1V
–0.1V
–32V
–0.1V –0.1V
33.6V
–33V
0V
0V
0V 0V
35.4V
–35.4V –35.4V
0V