1
SERVICE MANUAL
US Model
Canadian Model
AEP Model
Tourist Model
Korean Model
Chinese Model
ICD-P28
IC RECORDER
Recording media
Built-in flash memory, Monaural recording
Recording time
SP: 9 hours 40 minutes
LP: 15 hours 45 minutes
Frequency response
180 Hz - 3,500 Hz
Speaker
approx. 3.2 cm (1 5/16 in.) dia.
Power output
250 mW
Input/Output
· Earphone jack (minijack) for 8 - 300 ohms
ear receiver/headphones
· Microphone jack (minijack, monaural)
Plug in power
Minimum input level 0.6 mV
3 kilohms or lower impedance microphone
Power requirements
Two LR03 (size AAA) alkaline batteries: 3 V DC
Dimensions (w/h/d) (not incl. projecting parts and controls)
44.5
× 105.3 × 14.0 mm (1 13/16 × 4 1/4 × 9/16 in.)
Mass (incl. batteries)
71 g (2.5 oz)
Supplied accessories
LR03 (size AAA) alkaline batteries (2) (For the
US only)
USB connecting cable (1)
Application software (CD-ROM) (1)
Design and specifications are subject to change without notice.
SPECIFICATIONS
Ver 1.1 2004. 04
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
9-877-649-02
2004D04-1
© 2004. 04
2
TABLE OF CONTENTS
1. SERVICE NOTE ................................................................ 3
2. GENERAL
Index to Parts and Controls ..................................................... 4
3. DISASSEMBLY
3-1. Case (Upper) Assy .............................................................. 5
3-2. F-SW Board, P-SW Board .................................................. 6
3-3. Main Board ......................................................................... 6
3-4. PC Board ............................................................................. 7
4. TEST MODE ....................................................................... 8
5. DIAGRAMS
5-1. IC Pin Description ............................................................. 11
5-2. Block Diagram .................................................................. 13
5-3. Printed Wiring Board Main Section ............................ 15
5-4. Printed Wiring Board F-SW Section ........................... 16
5-5. Printed Wiring Board P-SW, PC Section .................... 17
5-6. Schematic Diagram Main Section (1/2) ...................... 18
5-7. Schematic Diagram Main Section (2/2) ...................... 19
5-8. IC Block Diagrams ............................................................ 20
6. EXPLODED VIEWS
6-1. Case Section ...................................................................... 21
6-2. Main Board Section .......................................................... 22
7. ELECTRICAL PARTS LIST ........................................ 23
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.
ICD-P28
· 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.
3
ICD-P28
SECTION 1
SERVICE NOTE
1-1. CAUTIONS OF FLASH MEMORY (IC701)
EXCHANGE
[Precaution when the flash memory (IC701) is replaced]
When the flash memory (IC701) is replaced, be sure to perform the
BAD BLOCK check* and writing of the model code. If they are not
completed, the unit will not operate normally.
* BAD BLOCK check is to check the flash ROM memory
area (the BAD BLOCK area) where data cannot be
guaranteed. The resultant information of this check is stored
in the TOC-AREA so that the BAD BLOCK area should
not be used.
[BAD BLOCK Check Procedure]
1. When the power is turned on after the flash memory (IC701) is
replaced, the BAD BLOCK check starts automatically and the
OPR (D701) lights in orange.
2. In about 30 seconds after start of the check, the OPR (D701)
changes the color to green indicating that the check is
completed.
R101
R110
51
50
30
31
TP719
TP101
TP102
TP718
TP714 TP715
R717
D701
RED
(REC)
D701
OPR
GRN
(PLAY)
Q701
R716
FB103
FB102
R133
X101
C106
C105
C114
R104
C116
C111
R135
C107
R105
C101
FB101
FB104
R102
R103
R128
C112
C110
C102
C104
C125
B E B
C
C
MAIN BOARD (SIDE B)
4
ICD-P28
SECTION 2
GENERAL
This section is extracted
from instruction manual.
Index to Parts and Controls
Main unit
MIC jack
(PLUG IN POWER)
EAR (earphone) jack
OPR (operation) indicator
zREC (record) /STOP
X PAUSE
./ >+ SELECT
(ENTER)
NxPLAY/STOP
(ENTER)
HOLD
VOL (volume)
USB connector
Rear
Battery
compartment
Hook for handstrap
(not supplied)
Display window
Remaining battery
indicator
Recording mode
indication
REC (recording)
indicator
Selected message
number/number of
messagesin a folder
Counter /Remaining time indication /Recording date and
time indication /Current time indication (15:30,etc.) /Menu
indication (ALARM, BEEP, etc.) /Mode indication of the
menu (ON, OFF, etc.) /Messages (ERASE,HOLD, etc.)
MIC
(built-in microphone)
Display window
FOLDER
DIVIDE
DISPLAY
MIC SENS
(microphone sensitivity)
MENU
ERASE
Speaker
STOP
Remaining memory indicator
Folder indication
Alarm indicator
Microphone sensitivity indication
Repeat play indicator
5
ICD-P28
Note : This set can be disassemble according to the following sequence.
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1. CASE (UPPER) ASSY
3-1.
CASE (UPPER) ASSY
(Page 5)
3-2.
F-SW BOARD,
P-SW BOARD
(Page 6)
SET
3-3.
MAIN BOARD
(Page 6)
3-4.
PC BOARD
(Page 7)
1
screw
(B 1.7x10)
4
claw
2
screw
(B 1.7x7)
9
speaker (SP101)
3
two claws
5
three claws
6
claw
0
case (upper) assy
case block assy
7
8
two screws
(1.7
x 2.5)