Sony NW-MS77DR Service Manual ▷ View online
5
NW-MS77DR
SECTION 4
DISASSEMBLY
• The equipment can be removed using the following procedure.
4-2
Case (R) ASSY
(Page 5)
(Page 5)
4-4.
Button (MS) ASSY,
chassis (R) ASSY
(Page 6)
(Page 6)
SET
4-2
Case (U) sub ASSY, play unit
(Page 5)
(Page 5)
4-5.
MI-MH battery,
POWER board
(Page 7)
(Page 7)
4-4.
Case (R) sub ASSY
(Page 6)
4-3 LCD board
(Page 6)
(Page 6)
4-6.
NAND board,
MAIN board
(Page 7)
(Page 7)
Note :
Follow the disassembly procedure in the numerical order given.
4-2. CASE (U) SUB ASSY, PLAY UNIT
7
3
8
1
screw (M1.4)
4
cable, flexible flat (20 core)
0
shaft (play)
6
case (U) sub assy
9
play unit
5
hold bumper
2
screw (M1.4)
case (R) assy
4-1. DISASSEMBLY FROW
6
NW-MS77DR
4-4. BUTTON (MS) ASSY, CHASSIS (R) ASSY
2
1
button (MS) assy
5
spring (shutter)
4
shutter (MS)
6
two screws (M1.4x3)
3
screw (M1.4)
7
bracket (shutter)
8
chassis (R) ASSY
case (R) sub assy
4-3. LCD BOARD
2
1
four craws
case (U) sub assy
3
LCD board
7
NW-MS77DR
4-6. NAND BOARD, MAIN BOARD
3
1
1
5
MAIN Board
4
NAND Board
shassis (R)
2
connector (CN465)
Note on assembling NAND board
On assembling NAND board, secure
it to the gap on the chassis (R) assembly.
On assembling NAND board, secure
it to the gap on the chassis (R) assembly.
Note on assembling MAIN board
On assembling MAIN board, secure
it to the gap on the chassis (R) assembly.
On assembling MAIN board, secure
it to the gap on the chassis (R) assembly.
4-5. NI-MH BATTERY, POWER BOARD
2
3
connector (CN501)
4
NI-MH battery
chassis (R)
1
connector (CN502)
5
POWER Board
Note on assembling POWER board
On assembling POWER board,
secure it to the gap on the chassis (R)
assembly.
On assembling POWER board,
secure it to the gap on the chassis (R)
assembly.
8
NW-MS77DR
• WAVEFORMS
IC731
8
OSCOUT
VOL/DIV : 0.5 V AC
TIME/DIV : 10
TIME/DIV : 10
µ
sec
1.1 Vp-p
32KHz
1
Note on Schematic Diagram:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F 50 WV or
less are not indicated except for electrolytics and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise specified.
•
%
: indicates tolerance.
•
C
: panel designation.
•
A
: B+ Line.
• Power voltage is dc1.2V 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
*
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MW).
Voltage variations may be noted due to normal production toler-
ances.
ances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production toler-
ances.
ances.
• Circled numbers refer to waveforms.
•
•
Signal path.
F
: PLAY
E
: CHECK OUT
j
: CHECK IN
• IC401 (microcomputer), IC451 (frash RAM) on Main board
cannot be replaced individually.
Replace it with Main board assembly for service.
Replace it with Main board assembly for service.
• IC461, 463 (frash RAM) on NAND board cannot be replaced
individually.
Replace it with NAND board assembly for service.
Replace it with NAND board assembly for service.
• IC801 (DSP) on CRADLE MAIN board cannot be replaced
individually.
Replace it CRADLE MAIN board assembly for service.
Replace it CRADLE MAIN board assembly for service.
Note on Printed Wiring Board:
•
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
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.
• Main boards is six-layer pritnted board.
However, the patterns of layer 2 to 5 have not been included in this
diagrams.
diagrams.
SECTION 5
DIAGRAMS
• IC401 (microcomputer), IC451 (frash RAM) on Main board cannot
be replaced individually.
Replace it with Main board assembly for service.
• IC461, 463 (frash RAM)) on NAND board cannot be replaced
• IC461, 463 (frash RAM)) on NAND board cannot be replaced
individually.
Replace it with NAND board assembly for service.
• IC801 (DSP) on CRADLE MAIN board cannot be replaced
• IC801 (DSP) on CRADLE MAIN board cannot be replaced
individually.
Replace it CRADLE MAIN board assembly for service.
– MAIN BOARD –
Ver 1.2
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