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9-974-470-11
PCG-723/729 (US)
­ 34 ­
Sony Corporation
Information Technology Company
PCG-723/729
Notebook Computer
9-974-470-11
US Model
PCG-723/729
(US)
9-974-470-11
98A1602-1
English
98A1602-1
Printed in USA
© 1998. 1
Published by Technical Response Center (Japan)


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Information in this document is subject to change without
notice.
Sony and VAIO are trademarks of Sony. Intel logo and Intel
Inside logo are registered trademarks of Intel Corporation. i486
and Pentium are trademarks of Intel Corporation. Microsoft,
MS-DOS, Windows and the Windows 95 logo are trademarks
of Microsoft Corporation.
All other trademarks are trademarks or registered trademarks
of their respective owners. Oter trademarks and trade names
may be used in this document to refer to the entitles claiming
the marks and names or their produces. Sony Corporation
disclaims any proprietary interest in trademarks and trade names
other than its own.
Service and Inspection Precautions
1. Obey
precautionary
markings
and
instructions
Labels and stamps on the cabinet, chassis, and components identify
areas requiring special precautions. Be sure to observe these
precautions, as well as all precautions listed in the operating manual
and other associated documents.
2. Use designated parts only
The set's components possess important safety characteristics, such
as noncombustibility and the ability to tolerate large voltages. Be
sure that replacement parts possess the same safety characteristics as
the originals.
Also remember that the
! mark, which appears in
circuit diagrams and parts lists, denotes components that have
particularly important safety functions; be extra sure to use only the
designated components.
3. Always follow the original design when
mounting parts and routing wires
The original layout includes various safety features, such as inclusion
of insulating materials (tubes and tape) and the mounting of parts
above the printer board. In addition, internal wiring has been routed
and clamped so as to keep it away from hot or high-voltage parts.
When mounting parts or routing wires, therefore, be sure to duplicate
the original layout.
4. Inspect after completing service
After servicing, inspect to make sure that all screws, components,
and wiring have been returned to their original condition. Also check
the area around the repair location to ensure that repair work has caused
no damage, and confirm safety.
5. When replacing chip components...
Never reuse components. Also remember that the negative side of
tantalum capacitors is easily damaged by heat.
6. When handling flexible print boards...
· The temperature of the soldering-iron tip should be about 270C.
· Do not apply the tip more than three times to the same pattern.
· Handle patterns with care; never apply force.
Caution: Remember that hard disk drives are easily damaged by
vibration. Always handle with care.
­ 2 ­
Caution Markings for Lithium/Ion Battery - The following or
similar texts shall be provided on battery pack of equipment or
in both the operating and the service instructions.
CAUTION: Danger of explosion if battery is incorrectly
replaced. Replace only with the same or equivalent type
recommended by the manufacturer. Discard used batteries
according to the manufacturer's instructions.
CAUTION: The battery pack used in this device may present a
fire or chemical burn hazard if mistreated. Do not disassemble,
heat above 100
°C (212°F) or incinerate.
Dispose of used battery promptly.
Keep away from children.
PCG-723/729 (US)


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­ 3 ­
PCG-723/729 (US)
TABLE OF CONTENTS
CHAPTER 1. REMOVAL
1-1.
Flowchart ..................................................................................... 1-1
1-2.
Main Electrical Parts Location Diagram ..................................... 1-1
1-3.
Removal ....................................................................................... 1-2
1.
Hinge Cover, Foot, I/O Door ....................................................... 1-2
2.
Palm Rest Housing Assy, Key Board Unit, Display Assy (1) ..... 1-2
3.
Palm Rest Housing Assy, Key Board Unit, Display Assy (2) ..... 1-3
4.
Upper Heat Sink, DC Fan Motor, MPM-9 Board ....................... 1-3
5.
CNX-37 Board, IFX-23 Board, NIMH Battery ........................... 1-4
6.
MBX-5 Board, PC Card Connector ............................................. 1-4
7.
Memory Module(RAM), RO-26 Board ...................................... 1-5
8.
LCD Cable ................................................................................... 1-5
9.
LCD Unit, Inverter Assy, Speaker Assy ...................................... 1-6
10. LCD Cable ................................................................................... 1-7
(to 1-7)
CHAPTER 2. SELF DIAGNOSTICS
2-1.
Required Tools and Peripheral Devices ....................................... 2-1
2-2.
Tools and Peripheral Device Connection .................................... 2-3
2-3.
How to Start the Diagnostics ....................................................... 2-4
2-4.
Test Items ..................................................................................... 2-4
(to 2-8)
CHAPTER 3. BLOCK DIAGRAM .............................................. 3-1
(to 3-2)
CHAPTER 4. FRAME HARNESS DIAGRAM ............................ 4-1
(to 4-2)
CHAPTER 5. EXPLODED VIEWS AND PARTS LIST .............. 5-1
(to 5-4)
Section
Title
Page


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1-1
PCG-723/729 (US)
CHAPTER 1.
REMOVAL
1-1. Flowchart
· P XX means pages that appears in this manual.
· Remember that hard disk drives are easily damaged by vibration. Always handle with care.
1-2. Main Electrical Parts Location Diagram
LCD Unit
Inverter Assy
LEX-10 Board
Speaker Assy
PC Card Connector
RO-26 Board
MBX-5 Board
IFX-23 Board
FD Drive
or
CD-ROM Drive
or
Battery Pack Weight Saver
CNX-37 Board
Track Pad
Battery Pack
HDD
Memory Module (RAM)
MPM-9 Board
DC FAN
Speaker Assy
POWER
OFF
FDD,
CDD
HDD
BATTERY
PACK
DOOR
MEMORY
FOOT L
P 1-2
P 1-5
P 1-5
P 1-5
P 1-5
P 1-2
P 1-3
P 1-2
P 1-3
P 1-2
P 1-3
P 1-4
P 1-4
P 1-4
P 1-4
P 1-4
P 1-4
P 1-4
P 1-4
P 1-6
P 1-6
P 1-6
P 1-6
P 1-3
P 1-3
P 1-3
PALM
REST
KEY
BOARD
RO-26
BOARD
RAM
IFX-23
BOARD
UPPER
HEAT SINK
NIMH
BATTERY
LEX-10
BOARD
MPM-9
BOARD
DC FAN
CNX-37
BOARD
I/O
BRACKET
BEZEL
HOUSING
LCD
UNIT
SPEAKER
ASSY
LATCH
DETECTOR
DISPLAY
ASSY
INVERTER
ASSY
MBX-5
BOARD
PC CARD
CONNECTOR
DOOR
FLASH


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1-2
PCG-723/729 (US)
1-3.Removal
1. Hinge Cover, Foot, I/O Door
2. Palm Rest Housing Assy, Key Board Unit, Display Assy (1)
4+B M2.6X8.5
4+B M2.6X8.5
3
3
Foot L
Foot Cover
Foot Cover
Foot L
5Hinge L Cover
5Hinge L Cover
1Hinge Center Cover
2I/O L Door
2I/O C Door
2I/O R Door
1IR Lens
Spring Holder
Spring Holder
6
7
2+P 2X3.5
(X2)
1+P M2X19
(X3)
1+P M2X19
1+P M2X19
3
4
Palm Rest Housing Assy
Display Assy
Key Board Unit