PORTABLE CD PLAYER
Personal Audio Company
Published by Sony Engineering Corporation
Ver 1.1 2003. 10
Model Name Using Similar Mechanism
CD Mechanism Type
Optical Pick-up Name
Compact disc digital audio system
Laser diode properties
= 780 nm
Emission duration: Continuous
Laser output: 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 with 7 mm aperture.)
For the area code of the model you purchased, check the
upper left side of the bar code on the package.
· Two LR6 (size AA) batteries: 1.5 V DC
· AC power adaptor (DC IN 4.5 V jack):
US, Canadian models: 120 V, 60 Hz
AEP model: 100 - 240 V, 50/60 Hz
· Two Ni-MH rechargeable batteries (size AA):
1.2 V DC
Dimensions (w/h/d) (without projecting
parts and controls)
× 34 × 151 mm (5 1/4 × 1 3/8 × 6 in.)
Mass (excluding accessories)
Approx. 333 g (11.7 oz)
°C - 35°C (41°F - 95°F)
Design and specifications are subject to change without
Hand strap (1)
AC power adaptor* (1)
* Not supplied with the U model. For the area code of the
model you purchased, check the upper left side of the
bar code on the package.
Flexible Circuit Board Repairing
·Keep the temperature of the soldering iron around 270 °C dur-
· Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
· Be careful not to apply force on the conductor when soldering
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.
This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on
the rear exterior.
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
On AC poweradaptor
· Use only the commercially-available AC power
adaptor whose rated output is 4.5 V DC, 500 mA.
Do not use any other AC power adaptor. It may
cause a malfunction.
Polarity of the plug
TABLE OF CONTENTS
1. SERVICING NOTE ·························································· 3
2. GENERAL ·········································································· 5
3-1. CABINET (UPPER) SUB ASSY,
PANEL (UPPER) LID ASSY ········································ 6
3-2. CONTROL BOARD ····················································· 7
3-3. CD MECHANISM (CDM-3325ER) ····························· 7
3-4. MAIN BOARD ····························································· 8
3-5 MOTOR ASSY (SLED)(M902),
OPTICAL PICK-UP (DAX-25E),
TURN TABLE MOTOR ASSY (SPINDLE)(M901) ···· 8
4. ELECTRICAL CHECKING ··········································· 9
5. DIAGRAMS ······································································ 10
5-1. BLOCK DIAGRAM ··················································· 11
5-2. PRINTED WIRING BOARDS
MAIN BOARD (SIDE A) ····································· 12
5-3. PRINTED WIRING BOARDS
MAIN BOARD (SIDE B) ····································· 13
5-4. SCHEMATIC DIAGRAMS
MAIN BOARD (1/3) ············································· 14
5-5. SCHEMATIC DIAGRAMS
MAIN BOARD (2/3) ············································· 15
5-6. SCHEMATIC DIAGRAMS
MAIN BOARD (3/3) ············································· 16
5-7. PRINTED WIRING BOARDS
CONTROL BOARD ············································· 17
5-8. SCHEMATIC DIAGRAMS
CONTROL BOARD ············································· 18
5-9. IC BLOCK DIAGRAMS ············································ 19
5-10. IC PIN FUNCTION DESCRIPTION ························· 21
6. EXPLODED VIEWS
6-1. CABINET (UPPER) SECTION ·································· 23
6-2. CABINET (LOWER) SECTION ································ 24
6-3. CD MECHANISM SECTION (CDM-3325ER) ········· 25
7. ELECTRICAL PARTS LIST ······································· 26
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 IDENTIFÉS 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 PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.
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 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
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.
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
The flexible board is easily damaged and should be handled with
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,
observe from more than 30 cm away from the objective lens.
BEFORE REPLACING THE OPTICAL PICK-UP BLOCK
Please be sure to check thoroughly the parameters as par the "Optical
Pick-Up Block Checking Procedures" (Part No.: 9-960-027-11)
issued separately before replacing the optical pick-up block.
LASER DIODE AND FOCUS SEARCH OPERATION
During normal operation of the equipment, emission of the laser
diode is prohibited unless the upper lid is closed while turning ON
the S303. (push switch type)
The following checking method for the laser diode is operable.
Emission of the laser diode is visually checked.
1. Open the upper lid.
2. With a disc not set, turn on the S303 with a screwdriver having a
thin tip as shown in Fig.1.
3. Press the u button.
4. Observing the objective lens, check that the laser diode emits
When the laser diode does not emit light, automatic power control
circuit or optical pickup is faulty.
In this operation, the objective lens will move up and down 4
times along with inward motion for the focus search.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
Fig. 1 Method to push the S303
The software version display and LCD test can be performed when
the test mode is activated.
1. Confirm the set is not powered on. (Remove two batteries and
disconnect the AC power adaptor.)
2. Short the solder land SL301 (TEST) on the MAIN board.
3. Turn on the main power. (Insert two batteries.)
4. Microcomputer version is displayed for about a second.
5. After that all segments of the liquid crystal display are turned on.
6. Turn off the main power. (Remove two batteries.)
7. Open the solder land SL301 (TEST) on the MAIN board.
Note : The solder should be removed clean.
MAIN BOARD (SIDE A)
This section is extracted
from instruction manual.
* The button has a tactile dot.
6 VOLUME +*/
5 PLAY MODE/
8 E·A·S·S GP
Insert the ( end first
(for both batteries).
Remaining battery power
DC IN 4.5 V (external power
2 ca* (play/pause)/ENTER
3 r/t (skip/search)
Open the battery