Sony NW-E55 / NW-E75 / NW-E90 / NW-E95 Service Manual ▷ View online
5
NW-E55/E75/E90/E95
SECTION 2
TEST MODE
STANDING PROCEDURE
Procedure 1: Set a dry battery into NW-E50/E70, and keep the
battery lid open.
Procedure 2: In HOLD state, while pushing Nx and
[GROUP]
button, turn power on by closing the battery lid of
NW-E50/E70.
NW-E50/E70.
Procedure 3: Set HOLD state off.
After starting up test mode, the following contents can be checked.
TEST MODE
• Nx button
The KEY test mode is activated. All key inputs are completed,
then Nx button is pressed, restart. (Be aware that the
initialization is included on all key input.)
then Nx button is pressed, restart. (Be aware that the
initialization is included on all key input.)
•
[MENU]
button
EL0 (blue) lights on/off.
•
[GROUP]
button
EL1 (green) lights on/off.
• -/>
All LCD lights and ACCESS LED lights off.
• ./+
All LCD lights and ACCESS LED lights on.
•
[VOL +]
button
BEEP turns on.
•
[VOL --]
button
BEEP turns off.
•
[ REPEAT SOUND]
button
Initialized. (Turns to the factory preset state, time, volume
setting and so on.)
The music data, files and so on in the memory are not changed.
setting and so on.)
The music data, files and so on in the memory are not changed.
•
6
NW-E55/E75/E90/E95
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
Note : Disassemble the unit in the order as shown below.
SET
3-1. CASE,CHASSIS (FRONT) ASSY
(Page 6)
3-2. DISPLAY BOARD ASSY
(Page 7)
3-3. MAIN BOARD ASSY
(Page 7)
3-1. CASE, CHASSIS (FRONT) ASSY
MAIN board section
1
case
3
chassis (front)
4
three button (cup)
5
window (led)
2
three claws
7
NW-E55/E75/E90/E95
3-2. DISPLAY BOARD ASSY
3-3. MAIN BOARD ASSY
MAIN board section
4
DISPLAY board
2
tapping screw (1.7)
3
cover section
1
lid (usb) (sub assy)
4
MAIN board
3
chassis(rear)
ornament assy
2
two claws
1
tapping screw (B1.7x7)
8
NW-E55/E75/E90/E95
Note on Schematic Diagram:
• All capacitors are in
• All capacitors are in
µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω and
1
/
4
W or less unless otherwise
specified.
•
%
: indicates tolerance.
• C : panel designation.
•
: B+ Line.
• Power voltage is dc 1.5 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : PLAY
no mark : PLAY
• Voltages are taken with a VOM (Input impedance 10 M
Ω).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
F
: PLAY
a
: DIGITAL OUT
k : DIGITAL IN
z
Waveforms
Note on Printed Wiring Board
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
•
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
•
: Pattern from the side which enables seeing.
•
: Through hole.
Caution:
Pattern face side:
Parts on the pattern face side seen from the
(Side B)
pattern face are indicated.
Parts face side:
Parts on the parts face side seen from the
(Side A)
parts face are indicated.
SECTION 4
DIAGRAMS
1
IC700
8 (OSCOUT)
1.1 Vp-p
31.25
µsec
0.5V/div
10
µsec/div
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