Sony CDXL-450-V Service manual

CDX-L450V

SERVICE MANUAL

Ver 1.1 2001. 11

• The CD sections have no adjustments.

SPECIFICATIONS

CD player section

Signal-to-noise ratio 90 dB
Frequency response 10 – 20,000 Hz
Wow and flutter Below measurable limit

Tuner section

FM

Tuning range FM tuning interval:

Antenna terminal External antenna connector
Intermediate frequency 10.7 MHz
Usable sensitivity 11 dBf
Selectivity 75 dB at 400 kHz
Signal-to-noise ratio 65 dB (stereo),

Harmonic distortion at 1 kHz

Separation 33 dB at 1 kHz
Frequency response 30 – 15,000 Hz

AM

Tuning range AM tuning interval:

Antenna terminal External antenna connector
Intermediate frequency 10.7 MHz/450 kHz
Sensitivity 30 µV

50 kHz/200 kHz
switchable

87.5 – 108 MHz
(at 50 kHz step)

87.5 – 107.9 MHz
(at 200 kHz step)

68 dB (mono)

0.7% (stereo),

0.5% (mono)

9 kHz/10 kHz
switchable
531 – 1,602 kHz
(at 9 kHz step)
530 – 1,710 kHz
(at 10 kHz step)

E Model

Model Name Using Similar Mechanism CDX-L450X/L470X
CD Drive Mechanism Type MG-393X-121//K
Optical Pick-up Name KSS-720A

Power amplifier section

Outputs Speaker outputs

(sure seal connectors)

Speaker impedance 4 – 8 ohms
Maximum power output 50 W × 4 (at 4 ohms)

General

Outputs Audio output

Power amplifier control
lead
Power aerial relay control
lead

Tone controls Bass ±9 dB at 100 Hz

Treble ±9 dB at 10 kHz

Power requirements 12 V DC car battery

(negative earth)

Dimensions Approx. 178 × 50 × 176 mm

(w/h/d)

Mounting dimensions Approx. 182 × 53 × 161 mm

(w/h/d)
Mass Approx. 1.2 kg
Supplied accessories Parts for installation and

connections (1 set)

Front panel case (1)

Note

This unit cannot be connected to a digital
preamplifier or an equalizer.

Design and specifications are subject to change without
notice.

9-873-251-02

2001K0400-1
© 2001. 11

FM/AM COMPACT DISC PLAYER

Sony Corporation

e Vehicle Company
Published by Sony Engineering Corporation

1

k

CDX-L450V

SERVICE NOTES

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown and also use
the procedure in the printed matter which is included in the repair
parts.
The flexible board is easily damaged and should be handled with
care.

NOTES ON LASER DIODE EMISSION CHECK

The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick­up block. Therefore, when checking the laser diode emission, ob­serve from more than 30 cm away from the objective lens.

Notes on Chip Component Replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be

damaged by heat.

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.

If the optical pick-up block is defective, please replace the whole
optical pick-up block.
Never turn the semi-fixed resistor located at the side of optical
pick-up block.

optical pick-up bloc

semi-fixed resistor

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY P ARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.

2

TABLE OF CONTENTS

1. GENERAL

Location of controls................................................................. 4

Getting Started......................................................................... 4

CD Player ................................................................................ 5

Radio ....................................................................................... 5

Other Functions ....................................................................... 6

Connections ............................................................................. 7

2. DISASSEMBLY

2-1. Sub Panel Assy.................................................................... 9

2-2. CD Mechanism Block ....................................................... 10

2-3. Main Board ....................................................................... 10

2-4. Heat Sink ........................................................................... 11

2-5. Chassis (T) Sub Assy ........................................................ 11

2-6. Lever Section .................................................................... 12

2-7. Servo Board....................................................................... 12

2-8. Shaft Roller Assy .............................................................. 13

2-9. Floating Block Assy .......................................................... 13

2-10. Optical Pick-up Block ....................................................... 14

CDX-L450V

3. ELECTRICAL ADJUSTMENTS.................................15

4. DIAGRAMS

4-1. IC Pin Description............................................................. 17

4-2. Block Diagram –CD Section–........................................... 19

4-3. Block Diagram –Tuner Section–....................................... 20

4-4. Block Diagram –Display Section–.................................... 21

4-5. Circuit Boards Location .................................................... 21

4-6. Printed Wiring Boards –CD Mechanism Section–............ 22

4-7. Schematic Diagram –CD Mechanism Section– ................ 24

4-8. Printed Wiring Board –Main Section–.............................. 25

4-9. Schematic Diagram –Main Section (1/2)– ........................ 26

4-10. Schematic Diagram –Main Section (2/2)– ........................ 27

4-11. Printed Wiring Board –Display Section– .......................... 28

4-12. Schematic Diagram –Display Section–............................. 29

5. EXPLODED VIEWS

5-1. Chassis Section ................................................................. 32

5-2. Front Panel Section ...........................................................33

5-3. CD Mechanism Section (1) ............................................... 34

5-4. CD Mechanism Section (2) ............................................... 35

5-5. CD Mechanism Section (3) ............................................... 36

6. ELECTRICAL PARTS LIST ........................................ 37

3

CDX-L450V

SECTION 1

GENERAL

This section is extracted
from instruction manual.

4

CDX-L450V

5

CDX-L450V

Connections

6

CDX-L450V

7

CDX-L450V

8

SECTION 2

DISASSEMBLY

Note : This set can be disassemble according to the following sequence.

CDX-L450V

Set Sub Panel Assy CD Mechanism Block

Chassis (T) Sub Assy Lever Section

Servo Board

Floating Block Assy Optical Pick-up Block

2-1. SUB PANEL ASSY

3

claw

2

PTT 2.6x6

Main Board Heat Sink

Shaft Roller Assy

three claws

1

PTT 2.6x6

5

sub panel assy

4

claws

9

CDX-L450V

8

6

2-2. CD MECHANISM BLOCK

5

CD mechanism block

2

PTT 2.6x6

7

bracket (CD)

6

PTT 2.6x

2-3. MAIN BOARD

4

screws (+BTT)

3

5

MAIN board

3

screw (+BTT)

4

CNP701

1

PTT 2.6x6

10

1

PTT 2.6x8

2

PTT 2.6x

6

heat sink

1

PTT 2.6x8

2

PTT 2.6x8

4

PTT 2.6x8

3

PTT 2.6x12

5

PTT 2.6x8

2-4. HEAT SINK

CDX-L450V

2-5. CHASSIS (T) SUB ASSY

1

Unsolder the

lead wires.

2

P 2x3

black
red

white

3

P 2x3

4

chassis (T) sub assy

11

CDX-L450V

2-6. LEVER SECTION

6

lever (R)

3

tension spring (LR)

7

lever (L)

5

guide (disc)

1

special screw

2

IN SELF SW board

2-7. SERVO BOARD

4

claws

6

3

Removal the solders.

4

P 2x3

5

loading motor assy

special screws

1

CN3

7

special screw

2

8

SERVO board

CN2

12

r

2-8. SHAFT ROLLER ASSY

• When installing, take note of the positions

arm (roller) and washers. (Fig. 1)

3

retaing ring (RA)

4

shaft retainer

shaft retainer

retaing ring (RA)

arm

washer

5

shaft roller assy

2

arm (roller)

Fig. 1

washer

CDX-L450V

arm

shaft retaine

2-9. FLOATING BLOCK ASSY

7

compression spring (FL)

1

tension spring (KF1)

1

tension spring (RA)

6

floating block assy

8

compression spring (FL)

4

Fit lever (D) in the

direction of the arrow.

5

Turn loading ring in the

direction of the arrow.

3

damper (T)

2

damper (T)

13

CDX-L450V

2-10. OPTICAL PICK-UP BLOCK

1

P 2x3

2

sled motor assy

7

shaft (feed) assy

5

P 2x3

6

spring (feed), plate

3

optical pick-up block

4

pick-up flexible board

14

SECTION 3

ELECTRICAL ADJUSTMENTS

CDX-L450V

TEST MODE

This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and AM Auto Scan/Stop Level check can be
performed easier than it in ordinary procedure.

<Set the Test Mode>

1. Turn ON the regulated power supply to ACC and BATT
terminals is “OFF” position (display 1:00).

2. Push the preset 4 button.

3. Push the preset 5 button.

4. Press the preset 1 button for more than two seconds.

5. Then the display and LED on the front panel indicates all lights,
the test mode is set.

<Release the Test Mode>

1. Push the OFF button.

TUNER SECTION

Cautions during repair

When the tuner unit is defective, replace it by a new one because
its internal block is difficult to repair.

Note on Adjustment

The adjustments of tuner section, should be performed according
to the following sequence.

1. FM Auto Scan/Stop Level Adjustment

2. FM Stereo Separation Adjustment

3. AM Auto Scan/Stop Level Adjustment

FM Auto Scan/Stop Level Adjustment

Setting :

SOURCE button : FM
FREQUENCY SELECT switch : FM 50k

FM RF signal

generator

Carrier frequency : 98.0 MHz
Output level : 22 dB (12.6 µV)
Mode : mono
Modulation : 1 kHz, 22.5 kHz deviation (30%)

0 dB = 1 µV

µ

F

0.01

antenna
terminal

set

Procedure :

1. Set to the test mode.

2. Push the SRC button and set to FM.

Display

FM

ST

3. Adjust with the volume RV2 on TU601 so that the “FM”
indication turns to “FM0” indication on the display window .
But, in case of already indicated “FM0”, turn the RV2 so that
put out light “0” indication and adjustment.

FM0Z

Adjustment Location : See page 16.

ST

97.00

8

Display

97.00

8

SHUF

SHUF

Z

Z

Z

Z

15

CDX-L450V

r

FM Stereo Separation Adjustment

Setting :

SOURCE button : FM
FREQUENCY SELECT switch : FM 50k

FM RF signal

generator

0.01

Carrier frequency : 98.0 MHz
Output level : 70 dB (3.2 mV)
Mode : stereo
Modulation : main :1 kHz, 33.75 kHz deviation (45%)

sub :1 kHz, 33.75 kHz deviation (45%)
19 kHz pilot : 7.5 kHz deviation (10%)

Procedure :

FM stereo

signal generator

output channel

L-CH L-CH A

R-CH L-CH Adjust RV1 on TU601

R-CH R-CH C

L-CH R-CH Adjust RV1 on TU601

L-CH stereo separation : A – B
R-CH stereo separation : C – D
The separations of both channels should be equal.

Specification : Separation more than 24 dB

antenna
terminal

µ

F

set

AUDIO OUT REAR

Level meter Level meter

connection reading (dB)

for maximum reading.

for maximum reading.

10 k

B

D

level mete

Ω

AM Auto Scan/Stop Level Check

Note : This adjustment should be performed after the FM Auto

Scan / Stop Level Adjustment is done.

Setting :

SOURCE t MODE button : AM
FREQUENCY SELECT switch : AM 9k

Ω

15 pF

30

65 pF

AM RF signal

generator

Carrier frequency : 999 kHz
Output level : 30 dB (44.7 µV)
Mode : mono
Modulation : 1 kHz, 22.5 kHz deviation (30%)

Procedure :

1. Set to the test mode. (See page 15)

2. Push the SRC button.

3. Push the MODE button and set to AM.

AM

ST

4. Check that the “AM” indication turns to “AM0” indication on
the display window.

AM dummy
antenna (50

Display

999

SHUF

Display

Ω

)

set

set

antenna
terminal

Adjustment Location :

RV2

FM Auto Scan/Stop

Level Adjustment

RV1

FM Stereo Separation

Adjustment

16

TU601(Component Side)

AM0Z

ST

999

SHUF

SECTION 4

DIAGRAMS

4-1. IC PIN DESCRIPTION

• IC801 µPD780024AGK-B26-9ET (SYSTEM CONTROLLER)

Pin No. Pin Name I/O Pin Description

1 D SW I Down switch detection input
2 IN SW I Disc in switch detection input
3 PH3 I PH3 detection input (Not used in this set)
4 LM LD O Loading motor drive output (Loading)
5 LM EJ O Loading motor drive output (Eject)
6 A ATT O Power amplifier mute control output
7 ATT O Line out mute control output
8 BEEP O BEEP output

9 VSSO — Ground
10 VDDO — Power supply pin (+5 V)
11 VOL CLK O Electric volume clock output
12 VOL DO O Electric volume data out output
13 VOL CE O Electric volume chip enable output
14 AM ON O Tuner AM power supply control output
15 FM ON O Tuner FM power supply control output
16 NOSE I Front panel attachment detection input
17 PLL DI I PLL IC data input
18 LCD DO O LCD data output
19 LCD CE O LCD chip enable output
20 LCD CLK O LCD clock output
21 PLL CLK O PLL IC clock output
22 PLL DO O PLL IC data output
23 PLL CE O PLL IC chip enable output
24 VDD1 — Power supply pin (+5 V)
25 AVSS — Ground
26 ST IND I FM STEREO detection input
27 FUN SEL I Function select input
28 S METER I S meter signal input

29, 30 KEY0, 1 I A/D key input 0, 1

31 TEL ATT I Attenuator signal input
32 DST SEL I Destination select input
33 TEST I Force test mode input
34 AVREF — A/D converter power supply pin (+5 V)
35 AVDD — A/D converter power supply pin (+5 V)
36 RESET I Reset input
37 XT2 O Sub clock output (32.768 kHz)
38 XT1 I Sub clock input (32.768 kHz)
39 IC — Connect to Ground in this set.
40 X2 O Master clock output (8.38 MHz)
41 X1 I Master clock input (8.38 MHz)
42 VSS1 — Ground
43 KEY ACK I Key acknowledge detection input
44 SIRCS I SIRCS input
45 SELF SW I Self switch detection input
46 BU IN I Backup power supply detection input
47 AD ON O Key power supply control output
48 ILL ON O Illumination power supply control output
49 AMP ON O Amplifier remote power supply control output
50 CDM ON O CD mechanism deck power supply control output
51 XCD ON O CD DSP IC 16 MHz X’tal ON/OFF control output
52 TU ON O Tuner power supply control output

CDX-L450V

17

CDX-L450V

Pin No. Pin Name I/O Pin Description

53 P.ON O System power supply control output
54 X SO O CD DSP IC serial data output
55 X SI I CD DSP IC serial data input
56 X SCK O CD DSP IC serial clock output
57 RFOK I CD servo IC RFOK signal input
58 X RST O CD DSP IC reset control output
59 ACC IN I Accessory power supply detection input
60 AO O CD servo IC command/pallameter discrimination signal output
61 STB O CD servo IC data strobe signal output
62 XEN O CD DSP IC X’tal control output
63 L SW I Limit switch detection input
64 PH1 I PH1 detection input (Not used in this set)

18

4-2. BLOCK DIAGRAM — CD SECTION —

OPTICAL PICK-UP

KSS-720A

RF AMP,DIGITAL SERVO

DIGITAL SIGNAL PROCESSOR

IC1

CDX-L450V

PD

LD

A

C

B

D

E

F

FOCUS

COIL

I-V

CONV.

LD

DRIVE

Q1

A

82

C

83

B

84

D

85

E

87

F

86

PD

97

LD

98

FOCUS/TRACKING COIL DRIVE

SLED/SPINDLE/LOADING MOTOR DRIVE

FCS-

15

FCS+

16

APC

IC2

FOCUS

COIL

DRIVE

TRACKING

ERROR

(Page 20)

TUNER

LOUT

RF
EQ

FORCUS

ERROR

FD

26

EFM

DEMOD

SERVO

CTL

FDTDSD

62 63 64 65

MD

D/A

CONV

DSUB CODE

PROCESS

I/F

OSC

23 24

X1

16.9344MHz

ROUT

PACK
TSTB

TSCK

TSI

SCK

STB

RST

RFOK

XTALEN

16
12

R-CH

52
56
55
54

SI

8

SO

7

6

5

AO

4

3

2

9

SW1

(DOWN)

CDL

SECTION

A

SYSTEM CONTROL

54

X_SO

55

X_SI

56

X_SCK

61

STB

60

A0

58

X_RST

57

RFOK

XEN

62

1

D_SW

IC801(1/3)

TRACKING

COIL

M902

(SLED)

M901

(SPINDLE)

M903

(LOADING)

45

2

63

4

5

50

51

SELF_SW

IN_SW

L_SW

LM _LO

LM_ EJ

CDM ON

XCD_ON

RESET

IC902

36

1

S901

RESET

RESET

2

U_COM+5V

• Signal path

:CD

(DISC IN)

POWER
CONTROL
Q905,906

BATT

SW2

(SELF)

SW3

SW4

(LIMIT)

POWER

CONTROL

Q921

TRK+

17

TRK-

18

SL-

M

13

SL+

14

SP+

M

11

SP-

12

LD-

M

9

LD+

10

TRACKING

COIL

DRIVE

SLED

MOTOR

DRIVE

SPINDLE

MOTOR

DRIVE

LOADING

MOTOR

DRIVE

TD

23

SD

5

MD

6

LOAD

1

EJECT

2

A_5V

AU_5V

D_5V

DR_6V

REG

Q910,D910

REG

Q907,D908

D909

19 19