Sony CDX-L490B, CDX-L490X Service Manual

CDX-L490B/L490X

SERVICE MANUAL

Ver 1.0 2002. 12

Photo: CDX-L490X

• The tuner and CD sections have no adjustments.

SPECIFICATIONS

E Model

Model Name Using Similar Mechanism NEW CD Drive Mechanism Type MG-393XC-121//K Optical Pick-up Name KSS-721A

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 FM tuning interval:

50 kHz/200 kHz switchable

87.5 – 108 MHz (at 50 kHz step)

87.5 – 107.9 MHz

(at 200 kHz step) 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),

68 dB (mono) Harmonic distortion at 1 kHz

0.7% (stereo),

0.5% (mono) Separation 33 dB at 1 kHz Frequency response 30 – 15,000 Hz

Tuning range AM tuning interval:

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

(at 10 kHz step) Antenna terminal External antenna connector Intermediate frequency 10.7 MHz/450 kHz Sensitivity AM: 30 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 Audio outputs (rear)

Power antenna relay control terminal

Power amplifier control terminal Inputs Antenna input terminal Tone controls Low: ±10 dB at 60 Hz (XPLOD)

Mid: ±10 dB at 1 kHz (XPLOD)

High: ±10 dB at 10 kHz (XPLOD) 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

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.

9-874-266-01

FM/AM COMPACT DISC PLAYER

Sony Corporation

e Vehicle Company Published by Sony Engineering Corporation

CDX-L490B/L490X

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 dam-

aged by heat.

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-2502-063-1) CD-RW test disc TCD-W082L (Part No. J-2502-063-2)

Notes on CD-R/CD-RW discs

• You can play CD-Rs (recordable CDs)/CD-RWs (re writable CDs) designed for audio use on this unit. Look for these marks to distinguish CD-Rs/CD-RWs for audio use.

These marks denote that a disc is not for audio use.

• Some CD-Rs/CD-RWs (depending on the equipment used for its recording or the condition of the disc) may not play on this unit.

• You cannot play a CD-R/CD-RW that is not finalized∗.

∗ A process necessary for a recorded CD-R/CD-RW disc to be

played on the audio CD player.

This label is located on the bottom of the chassis.

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

When replacing the chassis (T) 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).

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.

TABLE OF CONTENTS

CDX-L490B/L490X

1. GENERAL

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

Connections .............................................................................4

2. DISASSEMBLY

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

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

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

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

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

2-6. Lever Section, In Self Sw Board.........................................9

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

2-8. Shaft Roller Assy, Load Sw Board ....................................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 Boards –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 –Display Section– .......................... 24

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

3-13. IC Block Diagrams............................................................ 26

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

EXTENSION CABLE AND SERVICE POSITION

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

• Connect the MAIN board (CNP701) and the SERVO board (CN1) with the extension cable (Part No. J-2502-062-1).

MAIN BOARD CNP701

SERVO BOARD CN1

CDX-L490B/L490X

SECTION 1

GENERAL

This section is extracted from instruction manual.

Connections

CDX-L490B/L490X

SECTION 2

DISASSEMBLY

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

SET

2-5. CHASSIS (T) SUB ASSY

2-1. SUB PANEL (1) ASSY

(Page 6)

(Page 8)

2-2. CD MECHANISM BLOCK

(Page 7)

2-6. LEVER SECTION

IN SELF SW BOARD (Page 9)

2-3. MAIN BOARD

(Page 7)

2-8. SHAFT ROLLER ASSY

LOAD SW BOARD

2-4. HEAT SINK

(Page 10)

(Page 8)

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 (1) ASSY

2-7. SERVO BOARD

(Page 9)

PTT 2.6x6

claws

sub panel (1) assy

claws

2-2. CD MECHANISM BLOCK

CD mechanism block

PTT 2.6x6

bracket (CD)

CDX-L490B/L490X

PTT 2.6x

2-3. MAIN BOARD

screws (+BTT)

MAIN board

screw (+BTT)

CNP701

PTT 2.6x6

PTT 2.6x

PTT 2.6x8

CDX-L490B/L490X

2-4. HEAT SINK

heat sink

PTT 2.6x8

PTT 2.6x

2-5. CHASSIS (T) SUB ASSY

Unsolder the

lead wires.

P 2x3

PTT 2.6x8

PTT 2.6x12

P 2x3

chassis (T) sub assy

black red white

2-6. LEVER SECTION, IN SELF SW BOARD

lever (R)

tension spring (LR)

lever (L)

guide (disc)

special screw

CDX-L490B/L490X

IN SELF SW board

2-7. SERVO BOARD

Removal the solders.

loading motor assy

claws

special screws

CN3

P 2x3

SERVO board

special screw

FLEXIBLE board

Unsolder the

lead wires.

black

yellow

optical pick-up block

CDX-L490B/L490X

2-8. SHAFT ROLLER ASSY, LOAD SW BOARD

• When installing, take note of the positions

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

retaining ring (RA)

special screw

shaft retainer (roller)

retaining ring (RA)

shaft retainer (roller)

arm

washer

Fig. 1

shaft roller assy

arm (roller)

washer

arm

shaft retainer (roller)

LOAD SW board

2-9. FLOATING BLOCK ASSY

compression spring (FL)

tension spring (KF1)

tension spring (RA)

floating block assy

compression spring (FL)

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

screw

plate spring (feed)

CDX-L490B/L490X

optical pick-up block

CDX-L490B/L490X

SECTION 3

DIAGRAMS

3-1. IC PIN DESCRIPTION

• IC801 µPD780076YGK-R24 (SYSTEM CONTROL) (MAIN Board)

Pin No. Pin Name I/O Pin Description

1D SW I Down switch detection signal input “L”: Down switch on 2 LM LD O Loading motor drive control signal output (Loading direction) 3 LM EJ O Loading motor drive control signal output (Eject direction) 4ATT O Mute control signal output of audio signal line “H”: mute on 5A ATTOMute control signal output to power amp IC (IC101) “L”: amp mute on 6 PLL DI I Serial data signal input to PLL IC (IC601) 7VOL ATT O Mute control signal output to Electric volume IC (IC401) 8 DOOR SW/IND I Door switch signal input Case of flipdown, sense to open condition of door “H”: open

9 VSS0 — Ground pin 10 VDD0 — Power supply pin 11 PLL CE O Chip enable signal output to PLL IC (IC601) 12 BEEP O Beep signal output of key beep, caution alarm to power amp IC (IC101) 13 SDAO O IIC data line signal output (control to electric volume IC (IC401)) 14 SCLO O IIC clock line signal output (control to electric volume IC (IC401)) 15 LCD CE O Chip enable control signal output to LCD driver IC (IC901) 16 LCD DO O Serial data signal output to LCD driver IC (IC901) 17 LCD CLK O Serial clock signal output to LCD driver IC (IC901) 18 BUS SI I SONY bus data signal input 19 BUS SO O SONY bus data signal output 20 BUS CLK I SONY bus clock signal input 21 BUS CLK GEN O SONY bus clock signal output

22 AM ON O

23 FM ON O 24 VDD1 — Power supply pin

25 AVSS — Ground pin

26 ST IND I/O At forced monaural on: “L” output

27 SHIFT/PH1 I Rotary commander shift key signal input Not used in this set. 28 S METER I S meter signal input from tuner unit (TU601)

29, 30 KEY0, KEY1 I A/D key signal input Input of A/D key matrix and front panel attachment decision.

31 R COM I 32 DST SEL I Destination select input from frequency select switch (SW803)

33 TEST I Test mode select signal input “L”: test mode 34 AVREF — Analog reference voltage pin 35 AD ON O LCD INHIBIT signal output Not used in this set. 36 RESET I Reset signal input from reset IC (IC902) “H”: reset 37 XT2 — Connect to sub clock (32.768 kHz) 38 XT1 — Connect to sub clock (32.768 kHz) 39 IC — At on board writer: 12 V power supply pin (usually ground pin) 40 X2 — Connect to crystal oscillator (8.38 MHz) 41 X1 — Connect to crystal oscillator (8.38 MHz) 42 VSS1 — Ground pin 43 KEY ACK I Key acknowledge signal input 44 SIRCS I Wireless remote control signal input from remote control receiver IC (IC951) 45 SELF SW I SELF switch detection signal input “L”: SELF switch on 46 BU IN I Backup power supply detection signal input 47 NOSE I Front panel attachment detection signal input from SW801 “L”: panel on

AM select signal output FM circuit power supply control output of tuner unit (TU601) “H”: FM on FM select signal output FM circuit power supply control output of tuner unit (TU601) “H”: FM on

Stereo signal input/monaural control signal output

At forced monaural off: input mode, stereo on for “L” input

Rotary commander AD level signal input Sense to key voltage level of rotary commander

+ 26 hidden pages