Sony Cdx L550 570x Manual

							1
Ver 1.0  2001. 01
Model Name Using Similar Mechanism NEW
CD Drive Mechanism Type MG-393X-121//K
Optical Pick-up Name KSS-720A
SERVICE MANUALUS Model
Canadian Model
CDX-L550X
E Model
CDX-L570X
CDX-L550X/L570X
FM/AM COMPACT DISC PLAYER
AUDIO POWER SPECIFICATIONS (US Model)
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
23 watts per channel minimum continuous average power into
4 ohms, 4 channels driven from 20 Hz to 20 kHz with no more
than 5% total harmonic distortion.
CD player section
Signal-to-noise ratio 90 dB
Frequency response 10 – 20,000 Hz
Wow and flutter Below measurable limit
Laser Diode Properties (US, Canadian Model)
Material GaAlAs
Wavelength 780 nm
Emission Duration Continuous
Laser output power Less than 44.6 µW*
*This output is the value measured at a distance
of 200 mm from the objective lens surface on the
Optical Pick-up Block.
Tuner sectionFM
Tuning range 87.5 – 107.9 MHz (US, Canadian model)
FM tuning interval (E Model):
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/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
AM
Tuning range 530 – 1,710 kHz (US, Canadian model)
AM tuning interval (E model):
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 30 µV
SPECIFICATIONS
Power amplifier sectionOutputs Speaker outputs
(sure seal connectors)
Speaker impedance 4 – 8 ohms
Maximum power output 52 W × 4 (at 4 ohms)
GeneralOutputs Audio outputs
Power Antenna relay control lead
Power amplifier control lead
Input Telephone ATT control lead
Tone controls Bass ±10 dB at 62 Hz (US, Canadian model)
Bass ±8 dB at 100 Hz (E model)
Treble ±10 dB at 16 kHz (US, Canadian model)
Treble ±8 dB at 10 kHz (E model)
Loudness (E model) +8 dB at 100 Hz
+2 dB at 10 kHz
Power requirements 12 V DC car battery
(negative ground)
Dimensions Approx. 178 × 50 × 176 mm
(7 
1/8 × 2 × 7 in.) (w/h/d)
Mounting dimensions Approx. 182 × 53 × 161 mm
(7 
1/4 × 2 1/8 × 6 3/8 in.) (w/h/d)
Mass Approx. 1.2 kg
(2 lb. 10 oz.)
Supplied accessories Parts for installation and connections (1 set)
Front panel case (1)
NoteThis unit cannot be connected to a digital preamplifier or an equalizer.
Design and specifications are subject to change without
notice.
Photo: CDX-L550X
• The tuner and CD sections have no adjustments.
Sony Corporation
Audio Entertainment Group
General Engineering Dept.
9-870-255-11
2001A0400-1
© 2001. 1 
						

							2
CDX-L550X/L570X
SERVICE NOTES
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.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.
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 pick-
up block. Therefore, when checking the laser diode emission, ob-
serve 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.
TABLE OF CONTENTS
1. GENERAL
Location of controls ................................................................. 3
Getting Started ......................................................................... 3
CD Player ................................................................................ 4
Radio ....................................................................................... 4
Other Functions ....................................................................... 5
Connection Diagram ................................................................ 7
2. DISASSEMBLY
2-1.   Sub Panel (CD) Assy ........................................................... 8
2-2.   CD Mechanism Block ......................................................... 8
2-3.   Main Board ......................................................................... 8
2-4.   Heat Sink (Main) ................................................................. 9
2-5.   Chassis (T) Sub Assy .......................................................... 9
2-6.   Lever Section .................................................................... 10
2-7.   Servo Board ....................................................................... 10
2-8.   Arm Roller Assy ................................................................ 11
2-9.   Floating Block ................................................................... 11
2-10. Optical Pick-up Block ....................................................... 12
3. DIAGRAMS
3-1.   IC Pin Descriptions ........................................................... 13
3-2.   Block Diagram –CD Section– ........................................... 15
3-3.   Block Diagram –Tuner Section– ....................................... 16
3-4.   Block Diagram –Display Section– .................................... 17
3-5.   Circuit Boards Location .................................................... 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 –Relay Section– ............................. 24
3-12. Schematic Diagram –Relay Section– ................................ 25
3-13. Schematic Diagram –Display Section– ............................. 26
3-14. Printed Wiring Board –Display Section– .......................... 27
4. EXPLODED VIEWS
4-1.   Chassis Section ................................................................. 30
4-2.   Front panel Section ........................................................... 31
4-3.   CD Mechanism Section (1) ............................................... 32
4-4.   CD Mechanism Section (2) ............................................... 33
4-5.   CD Mechanism Section (3) ............................................... 34
5. ELECTRICAL PARTS LIST........................................ 35
optical pick-up block
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  PARTS  WHOSE
PART  NUMBERS  APPEAR  AS  SHOWN  IN  THIS  MANUAL  OR
IN  SUPPLEMENTS  PUBLISHED  BY  SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
 À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE  DES PIÈCES
SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT.
NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES
SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL
OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY. 
						

							3
CDX-L550X/L570X
SECTION 1
GENERAL
This section is extracted
from instruction manual. 
						

							4
CDX-L550X/L570X 
						

							5
CDX-L550X/L570X 
						

							6
CDX-L550X/L570X 
						

							77
CDX-L550X/L570X 
						

							8 8
CDX-L550X/L570X
3 screw (+BTT)
4 screws (+BTT)
1 PTT 2.6x8 5 MAIN board 
2 PTT 2.6x8
4 CNP701 5 CD mechanism block7 bracket (CD)
3
6 PTT 2.6x6
1 PTT 2.6x
6
2 PTT 2.6x6
1 PTT 2.6x6 2 PTT 2.6x64two claws
3claw 6sub panel (CD) assy
5CNP802
Set Sub Panel (CD) Assy CD Mechanism Block
Chassis (T) Sub Assy Lever Section
Servo Board
Arm Roller Assy
Floating Block Assy Optical Pick-up Block
Main BoardHeat Sink (Main)
SECTION 2
DISASSEMBLY
Note :This equipiment can be removed usiing the following procedure.
Note :Follow the disassembly procedure in the numerical order given.
2-1. SUB PANEL (CD) ASSY2-2. CD MECHANISM BLOCK
2-3. MAIN BOARD 
						

							9
CDX-L550X/L570X
4 chassis (T) sub assy 3 P 2x3 2 P 2x3
1 Unsolder the
     lead wires.
black
red
white
6 heat sink (main)
1 PTT 2.6x82 PTT 2.6x84 PTT 2.6x8
3 PTT 2.6x125 PTT 2.6x8
2-5. CHASSIS (T) SUB ASSY 2-4. HEAT SINK (MAIN) 
						

							10
CDX-L550X/L570X
6 special screw
1 CN3 3 Removal the solders.
4 P 2x3
5 loading motor assy8 SERVO board2 CN2 7 special screw
4 claws2 IN SELF SW board 7 lever (L)  3 tension spring (LR) 6 lever (R) 5 guide (disc)
1 special screw
2-6. LEVER SECTION
2-7. SERVO BOARD