Sony CDX-L420V Service Manual

CDX-L420V

SERVICE MANUAL

Ver 1.0 2002. 01

• The tuner and CD sections have no adjustments.

SPECIFICATIONS

AEP Model

UK Model

Model Name Using Similar Mechanism CDX-L410

CD Drive Mechanism Type MG-393XA-121//Q

Optical Pick-up Name KSS-720A

CD player section

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

Tuner section

Tuning range 87.5 – 108.0 MHz Aerial terminal External aerial connector Intermediate frequency 10.7 MHz/450 kHz Usable sensitivity 8 dBf Selectivity 75 dB at 400 kHz Signal-to-noise ratio 66 dB (stereo),

72 dB (mono)

Harmonic distortion at 1 kHz

0.6% (stereo),

0.3% (mono) Separation 35 dB at 1 kHz Frequency response 30 – 15,000 Hz

MW/LW

Tuning range MW: 531 – 1,602 kHz

LW: 153 – 279 kHz Aerial terminal External aerial connector Intermediate frequency 10.7 MHz/450 kHz Sensitivity MW: 30 µV

LW: 40 µV

Power amplifier section

Outputs Speaker outputs

(sure seal connectors) Speaker impedance 4 – 8 ohms Maximum power output 45 W × 4 (at 4 ohms)

General

Outputs Power aerial relay control

lead Inputs Telephone ATT control lead Tone controls Bass ±9 dB at 100 Hz

Treble ±9 dB at 10 kHz Power requirements 12 V DC car battery

(negative ground) Dimensions Approx. 178 × 50 × 177 mm

(w/h/d) Mounting dimension Approx. 182 × 53 × 162 mm

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

connections (1 set)

Front panel case (1)

Design and specifications are subject to change without notice.

9-873-466-01

2002A0400-1

FM/MW/LW COMPACT DISC PLAYER

Sony Corporation

e Vehicle Company

Published by Sony Engineering Corporation

CDX-L420V

SERVICE NOTES

CLASS 1 LASER PRODUCT

This label is located on the bottom of the chassis.

INVISIBLE LASER RADIATION WHEN OPENCAUTION

DO NOT STARE INTO BEAM OR

VIEW DIRECTLY WITH OPTICAL INSTRUMENTS

This label is located on the drive unit’s internal chassis.

When replacing the chassis (T.U) of mechanism deck which have the “CAUTION LABEL” attached, please be sure to put a new LABEL (OP CAUTION) (3-223-913-01) to the chassis (T.U).

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.

TEST DISCS

This set can playback CD-R and CD-ROM discs. The following test discs should be used to check the capability:

CD-R test disc TCD-R082LMT (Part No. J-2501-063-1) CD-RW test disc TCD-W082L (Part No. J-2501-063-2)

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 dam-

aged by heat.

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 PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

EXTENSION CABLE AND SERVICE POSITION

When repairing or servicing this set, connect the jig (extension cable) as shown below.

• Connect the MAIN board (CNP301) and the SERVO board (CN1) with the extension cable (Part No. J-2502-011-1).

CDX-L420V

MAIN BOARD CNP301

SERVO BOARD CN1

J-2502-011-1

TABLE OF CONTENTS

1. GENERAL

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

Notes on CD-R/CD-RW discs ................................................. 4

Connections ............................................................................. 5

2. DISASSEMBLY

2-1. Sub Panel Assy .................................................................... 6

2-2. CD Mechanism Block ......................................................... 7

2-3. Main Board ......................................................................... 7

2-4. Heat Sink ............................................................................. 8

2-5. Chassis (T.U) Assy .............................................................. 8

2-6. Disc in Board ...................................................................... 9

2-7. Servo Board ......................................................................... 9

2-8. Shaft Roller Assy .............................................................. 10

2-9. Floating Block Assy .......................................................... 10

2-10. Optical Pick-up Block ....................................................... 11

3. DIAGRAMS

3-1. IC Pin Description ............................................................. 12

3-2. Circuit Boards Location .................................................... 14

3-3. Block Diagram –CD Section– ........................................... 15

3-4. Block Diagram –Tuner Section– ....................................... 16

3-5. Block Diagram –Display Section– .................................... 17

3-6. Printed Wiring Boards –CD Mechanism Section– ............ 18

3-7. Schematic Diagram –CD Mechanism Section– ................ 20

3-8. Printed Wiring Board –Main Section– .............................. 21

3-9. Schematic Diagram –Main Section (1/2)– ........................ 22

3-10. Schematic Diagram –Main Section (2/2)– ........................ 23

3-11. Printed Wiring Board –Key Section– ................................ 24

3-12. Schematic Diagram –Key Section–................................... 25

4. EXPLODED VIEWS

4-1. Chassis Section ................................................................. 28

4-2. Front panel Section ........................................................... 29

4-3. CD Mechanism Section (1) ............................................... 30

4-4. CD Mechanism Section (2) ............................................... 31

4-5. CD Mechanism Section (3) ............................................... 32

5. ELECTRICAL PARTS LIST......................................... 33

CDX-L420V

SECTION 1

GENERAL

This section is extracted from instruction manual.

Connections

CDX-L420V

SECTION 2

DISASSEMBLY

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

SET

2-5. CHASSIS (T.U) ASSY

2-1. SUB PANEL ASSY

(Page 6)

(Page 8)

2-2. CD MECHANISM BLOCK

(Page 7)

2-3. MAIN BOARD

(Page 7)

2-4. HEAT SINK

(Page 8)

2-6. DISC IN BOARD

(Page 9)

2-8. SHAFT ROLLER ASSY

(Page 10)

2-9. FLOATING BLOCK ASSY

(Page 10)

2-10. OPTICAL PICK-UP BLOCK

(Page 11)

Note : Follow the disassembly procedure in the numerical order given.

2-1. SUB PANEL ASSY

2-7. SERVO BOARD

(Page 9)

PTT 2.6x6

claw

sub panel assy

claws

2-2. CD MECHANISM BLOCK

5 CD mechanism block

2 PTT 2.6x6

CDX-L420V

7 bracket (CD)

6 PTT 2.6x

2-3. MAIN BOARD

6 MAIN board

5 ground point screws

(PTT 2.6x6)

4 CNP301

4 ground point screw

(PTT 2.6x6)

1 PTT 2.6x6

3 PTT 2.6x

2 PTT 2.6x6

1 PTT 2.6x6

CDX-L420V

2-4. HEAT SINK

4 heat sink

3 PTT 2.6x1

2-5. CHASSIS (T.U) ASSY

Unsolder the

lead wires.

P 2x3

1 PTT 2.6x10

2 PTT 2.6x16

P 2x3

chassis (T.U) sub ass

black red white

2-6. DISC IN BOARD

guide (disc)

PS 2x3

CDX-L420V

DISC IN board

2-7. SERVO BOARD

Removal the solders.

MOTOR FLEXIBLE board

P 2x3

claws

PS 2x4

SERVO board

PS 2x4

PICK-UP FLEXIBLE board

loading motor assy

optical pick-up block

CDX-L420V

2-8. SHAFT ROLLER ASSY

• When installing, take note of the positions

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

retaing ring (roller)

bearing (roller)

retaing ring (roller)

washer (RA)

arm

Fig. 1

shaft roller assy

arm (roller T)

washer (RA)

bearing (roller)

arm

2-9. FLOATING BLOCK ASSY

compression spring (FL)

tension spring (KF1)

tension spring (RA3)

floating block assy

compression spring (FL)

tension spring (KR1)

Fit lever (D) in the

direction of the arrow.

Turn loading ring in the

direction of the arrow.

damper (T)

2-10. OPTICAL PICK-UP BLOCK

P 2x3

sled motor assy

shaft (feed) assy

P 2x3

spring (feed), plate

optical pick-up block

CDX-L420V

SECTION 3

DIAGRAMS

3-1. IC PIN DESCRIPTION

• IC501 MN101C49KTD2 (SYSTEM CONTROL)

Pin No. Pin Name I/O Pin Description

1 VREF– — Rated voltage – for A/D converter.

2 VSM I S-meter voltage detection input

3 NC — Not used. (Connect to ground in this set)

4 KEYIN1 I Key input 1

5 KEYIN0 I Key input 0

6 RCIN0 I Rotary commander input 0

7 QUALITY I Noise detection input

8 MPTH I Tuner multi-path detection input

9 NC — Not used. (Connect to ground in this set)

10 VREF+ — Rated voltage + for A/D converter. (+5 V)

11 VDD — Power supply pin (+5 V)

12 OSCOUT O Oscillator output (18.432 MHz)

13 OSCIN I Oscillator input (18.432 MHz)

14 VSS — Ground

15 XIN I Oscillator input (32.768 kHz)

16 XOUT O Oscillator output (32.768 kHz)

17 MMOD — Mode selector (Connect to ground in this set)

18 LCDSO O LCD serial data output

19 LCDCE O LCD chip enable output

20 LCDCKO O LCD serial clock output

21 CD_TSO O CD text serial data output

22 CD_TSI I CD text serial data input

23 CD_TCKO O CD text serial clock output

24 NC — Not used. (Open)

25 NC — Not used. (Open)

26 KEY ACK I Key acknowledge detection input

27 DAVN I RDS data block synchro detection input

28 BUIN I Back-up power detection input

29 NC I Not used. (Connect to ground in this set)

30 CD_SELFSW I CD self switch input

31 CD_PACK I CD pack synchro signal input

32 NC (VCC) — Not used. (Connect to VDD in this set)

33 RESET I Reset input

34 NC — Not used. (Fixed at H in this set)

35 BEEP O Beep output

36 NC — Not used. (Open)

37 TESTIN I Test mode detection input

38 ACCIN I Accessory power detection input

39 NC (VCC) — Not used. (Open)

40 TELATT I Telephone attenuate detection input

41 NC (VCC) — Not used. (Connect to VDD in this set)

42 UNISO O SONY BUS data output

43 UNISI I SONY BUS data input

44 UNICKO O SONY BUS clock output

45 I2C_SIO I/O I2C BUS serial data input/output

46 NC — Not used. (Open)

47 I2C_CKO O I2C BUS serial clock output

48 NC — Not used. (Open)

49 TUNON O Tuner power control output

50 PW_ON O System power control output

51 TSTB O CD text strobe output

+ 26 hidden pages