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SERVICE MANUAL
SPECIFICATIONS
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
ICD-ST25
US Model
Canadian Model
AEP Model
UK Model
Korea Model
Tourist Model
IC RECORDER
Ver 1.0 2004.03
9-877-590-01
2004C1678-1
© 2004.03
Recording media
Built-in flash memory 32MB,
Stereo/Monaural recording
Recording time
See page 11.
Frequency range
· ST: 80 Hz - 13,500 Hz
· SP: 80 Hz - 7,000 Hz
· LP: 80 Hz - 3,500 Hz
Speaker
Approx. 28 mm (1 1/8 in.) dia.
Power output
300 mW
Input/Output
· Microphone jack (minijack, stereo)
­ input for plug in power, minimum input level
0.6 mV, 3 kilohms or lower impedance microphone
· Headphones jack (minijack, stereo)
­ output for 8 - 300 ohms ear receiver
· USB connector
· DC IN 3V jack (excluding the Korean and the
People's Republic of China models)
Playback speed control
+100% to -50% (DPC)
Power requirements
Two LR03 (size AAA) alkaline batteries: 3 V DC
Dimensions (w/h/d) (not incl. projecting parts and controls)
41.5
× 103.6 × 13.3 mm (1 11/16 × 4 1/8 × 17/32 in.)
Mass (incl. batteries)
75 g (2.65 oz)
Supplied accessories
Stereo Ear Receiver
× 1
USB Connecting cable
× 1
Application Software (CD-ROM)
× 1
Carring Case x 1
LR03 (size AAA) alkaline batteries
× 2*
*For the United States model only
Design and specifications are subject to change without notice.


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2
ICD-ST25
TABLE OF CONTENTS
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.
Replacement of IC6001 used in this set requires a special tool.
· The voltage and waveform of CSP (chip size package) cannot be
measured, because its lead layout is different from that of conven-
tional IC.
· Lead layouts
Unleaded 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.
1. GENERAL ·········································································· 3
2. DISASSEMBLY
2-1. Case Block Assy ··························································· 4
2-2. F-SW Board ·································································· 5
2-3. MAIN Board ································································· 5
2-4. S-SW Board, Microphone Block Assy ························· 6
2-5. Microphone Unit ··························································· 7
2-6. The Cautions At The Time Of A Microphone
Block Assy ··································································· 8
3. TEST MODE ······································································ 9
4. DIAGRAMS
4-1. Block Diagrams
­ MAIN Section -1 ­ ·················································· 13
­ MAIN Section -2 ­ ·················································· 14
­ PANEL/POWER Section ­ ······································ 15
4-2. Printed Wiring Board ­ MAIN Board (Side A) ­ ······· 16
4-3. Printed Wiring Board ­ MAIN Board (Side B) ­ ······· 17
4-4. Printed Wiring Board ­ F-SW Board ­ ······················· 18
4-5. Printed Wiring Board ­ S-SW Board ­ ······················· 19
4-6. Schematic Diagram ­ MAIN Board (1/5) ­ ··············· 20
4-7. Schematic Diagram ­ MAIN Board (2/5) ­ ··············· 21
4-8. Schematic Diagram ­ MAIN Board (3/5) ­ ··············· 22
4-9. Schematic Diagram ­ MAIN Board (4/5) ­ ··············· 23
4-10. Schematic Diagram ­ MAIN Board (5/5) ­ ··············· 24
4-11. IC Pin Function Descriptions ······································ 29
5. EXPLODED VIEWS
5-1. Upper Lid Block ························································· 34
5-2. Case Block ·································································· 35
6. ELECTRICAL PARTS LIST ······································· 36
surface
Lead layout of
conventional IC
CSP (chip size package)


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3
ICD-ST25
SECTION 1
GENERAL
This section is extracted from
instruction manual.
1
Built-in microphone (12, 14)
2
Built-in microphone (12, 14)
3
OPR (operation) indicator
(12, 20)
4
DIRECTNL (directional)
switch (14)
5
ERASE button (37)
6
A-B
(repeat)/PRIORITY
button (34, 44)
7
DIVIDE/
(bookmark)
button (33, 40)
8
Display window (24)
9
DPC ON/OFF switch (31)
Index to Parts and Controls
Refer to the pages indicated in parentheses for details.
Front
0
Speaker
K zREC (record) /REC
PAUSE button (12, 35)
L xSTOP button (13, 21)
M Jog lever
FOLDER/MENU/
.(review/fast backward)/
> (cue/fast forward)/
x· B (play/stop·enter)
N VOICE UP (Digital Voice
Up) switch (30)
O VOL (volume) +/­ buttons
(20)
qj
qk
ql
w;
wa
qh
USB connector (56)
qj m
(microphone) jack (17)
qk i
(headphones) jack (18, 20)
ql
HOLD switch (29, 51)
w;
DC IN 3V jack (6)
(For Korean and the People's
Republic of China Models,
this jack does not exist.)
wa
Battery compartment (6)
Rear
2 Press the jog lever (x·B).
The month digits will flash.
3 Set the month and day in
sequence, then press the jog lever
(x·B).
The hour digits will flash.
5 Set the time.
1 Press the jog lever up or down
(>/.) to select the digits of
the hour.
2 Press the jog lever (x·B).
The minute digits will flash.
3 Set the minute.
4 Press the jog lever (x·B).
The menu mode will be
displayed again.
Note
If you do not press the jog lever
(x·B) for more than one minute,
the clock setting mode is cancelled
and the window will return to
normal display.
6 Turn the jog lever toward
MENU.
The window will return to normal
display.
1 If the unit is left unused for more than 3
seconds in the stop mode after the clock
is set, the display will show the current
time (page 27).
v
Step 2: Setting the Clock
You need to set the clock to use the alarm function or record the date and
time.
Clock setting display appears when you insert batteries for the first time,
or when you insert batteries after the unit has been without batteries for a
certain period of time. In this case, proceed from step 4.
1 Turn the jog lever toward
MENU.
The menu mode will be displayed in
the display window.
2 Press the jog lever up or down
(>/.) to select "SET DATE".
3 Press the jog lever (x·B).
The date and time setting window is
displayed. The year digits will flash.
4 Set the date.
1
Press the jog lever up or down
(>/.) to select the digits of
the year.
Jog lever
Press the center
(x·B).
Press up (>).
Press down (.).
Turn toward MENU.


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4
ICD-ST25
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
Note : Disassemble the unit in the order as shown below.
2-1.
CASE BLOCK ASSY
(Page 4)
2-3.
MAIN BOARD
(Page 5)
2-2.
F-SW BOARD
(Page 5)
2-5.
MICROPHONE UNIT
(Page 7)
2-4.
S-SW BOARD,
MICROPHONE BLOCK ASSY
(Page 6)
SET
2-1. CASE BLOCK ASSY
1
two screws
(+B 1.7
× 7)
2
flexible board
4
case block assy
two claws
two claws
claw
claw
claw
3
Remove two solders
of the MAIN board.


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5
ICD-ST25
2-2. F-SW BOARD
2-3. MAIN BOARD
3
tapping screw
(1.7
× 2.5)
1
two screws
(1.7
× 2.5)
2
speaker (2.8cm)(SP3001)
4
F-SW board
5
upper lid block assy
3
claw
5
MAIN board
4
2
flexible board
1
flexible board of
microphone unit
case assy