Sony CDX-L480N User manual

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Ver 1.0 2003. 07
Model Name Using Similar Mechanism CDX-L480X
CD Drive Mechanism Type MG-393XC-121//Q
Optical Pick-up Name KSS-721A
SERVICE MANUAL
Thai Model
CDX-L480N
FM/AM COMPACT DISC PLAYER
• The tuner and CD sections have no adjustments.
Sony Corporation
e Vehicle Company
Published by Sony Engineering Corporation
9-961-055-01
2003G04-1
© 2003. 07

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SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINE
WITH MARK 0ON 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.
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.
CDX-L480N
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)

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zUNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40°C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350°C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
•Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
•Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
EXTENSION CABLE AND SERVICE POSITION
Whenrepairingorservicingthisset,connectthejig(extensioncable)
as shown below.
•Connect the MAIN board (CNP301) and the SERVO board (CN1)
with the extension cable (Part No. J-2502-011-1).
CDX-L480N
MAIN BOARD
CNP301
J-2502-011-1
SERVO BOARD
CN1

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TABLE OF CONTENTS
1. DISASSEMBLY
1-1. Sub Panel Assy .................................................................... 5
1-2. CD Mechanism Block ......................................................... 6
1-3. Main Board ......................................................................... 6
1-4. Heat Sink ............................................................................. 7
1-5. Chassis (T.U) Assy .............................................................. 7
1-6. Disc in Board ...................................................................... 8
1-7. Servo Board ......................................................................... 8
1-8. Shaft Roller Assy ................................................................ 9
1-9. Floating Block Assy ............................................................ 9
1-10. Optical Pick-up Block .......................................................10
2. DIAGRAMS
2-1. IC Pin Description............................................................. 11
2-2. Block Diagram –CD Section–...........................................12
2-3. Block Diagram –Tuner Section–....................................... 13
2-4. Block Diagram –Display Section–.................................... 14
2-5. Circuit Boards Location .................................................... 15
2-6. Printed Wiring Boards –CD Mechanism Section–............ 16
2-7. Schematic Diagram –CD Mechanism Section– ................ 18
2-8. Printed Wiring Board –Main Section– .............................. 19
2-9. Schematic Diagram –Main Section (1/2)– ........................ 20
2-10. Schematic Diagram –Main Section (2/2)– ........................ 21
2-11. Printed Wiring Board –Key Section– ................................ 22
2-12. Schematic Diagram –Key Section–................................... 23
2-13. IC Block Diagrams............................................................ 24
3. EXPLODED VIEWS
3-1. Chassis Section ................................................................. 27
3-2. Front Panel Section ........................................................... 28
3-3. CD Mechanism Section (1) ............................................... 29
3-4. CD Mechanism Section (2) ............................................... 30
3-5. CD Mechanism Section (3) ............................................... 31
4. ELECTRICAL PARTS LIST ........................................ 32
CDX-L480N

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CDX-L480N
SECTION 1
DISASSEMBLY
Note : This set can be disassemble according to the following sequence.
Note : Follow the disassembly procedure in the numerical order given.
1-1. SUB PANEL ASSY
1-1. SUB PANEL ASSY
(Page 5)
1-2. CD MECHANISM BLOCK
(Page 6)
1-5. CHASSIS (T.U) ASSY
(Page 7)
1-6. DISC IN BOARD
(Page 8)
1-8. SHAFT ROLLER ASSY
(Page 9)
1-9. FLOATING BLOCK ASSY
(Page 9)
1-10. OPTICAL PICK-UP BLOCK
(Page 10)
SET
1-7. SERVO BOARD
(Page 8)
1-3. MAIN BOARD
(Page 6)
1-4. HEAT SINK
(Page 7)
2 claws
3 claws
4 sub panel assy
1 two screws
(PTT 2.6x6)

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CDX-L480N
1-2. CD MECHANISM BLOCK
1-3. MAIN BOARD
1 screw
(PTT 2.6x6)
6 two screws
(PTT 2.6x4
)
7 bracket (CD)
2 screw
(PTT 2.6x6)
5 CD mechanism block
4 CNP301
3
1 two screws
(PTT 2.6x6
)
3 screw
(PTT 2.6x6)
(ground point)
4 two screws
(PTT 2.6x6)
(ground point)
5 MAIN board
2 two screws
(PTT 2.6x6)

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CDX-L480N
1-4. HEAT SINK
1-5. CHASSIS (T.U) ASSY
1 screw
(PTT 2.6x8)
3 screw
(PTT 2.6x8
)
5 heat sink
4
2
two screws
(PTT 2.6x12)
4 chassis (T.U) assy
3 two screws
(P 2x3)
2 two screws
(P 2x3)
1 Unsolder the
lead wires.
black
red
white

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CDX-L480N
1-6. DISC IN BOARD
1-7. SERVO BOARD
3 claws
2 DISC IN board
4 guide (disc)
1 screw
(PS 2x3)
6 two screws
(PTT 2x4)
7 screw
(PTT 2x4)
1 CN3
2 Removal the solders.
4 screw
(P 2x3)
5 loading motor assy
8 SERVO board
9 PICK-UP FLEXIBLE board
optical pick-up block
3 Unsolder the
lead wires.
black
yellow

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CDX-L480N
1-9. FLOATING BLOCK ASSY
Fig. 1
1 tension spring (RA3)
2 arm (roller T)
3 retaining ring (roller)
4 bearing (roller)
5 shaft roller assy
retaining ring (roller) arm arm
washer (RA) washer (RA)
bearing (roller) bearing (roller)
7 LOAD board
6 screw
(PTT 2x4)
1 tension spring (KF1)
2 tension spring (KR1)
8 compression spring (FL)
7 floating block assy
9 compression spring (FL)
5 Fit lever (D) in the
direction of the arrow.
3 damper (T)
4 damper (T)
6 Turn loading ring in the
direction of the arrow.
1-8. SHAFT ROLLER ASSY
• When installing, take note of the positions
arm (roller) and washers. (Fig. 1)

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CDX-L480N
1-10. OPTICAL PICK-UP BLOCK
1 two screws
(P 2x3)
4 screw
(P 2x3)
5 leaf spring (feed)
6 shaft (feed) assy
2 sled motor assy
3 optical pick-up block