2
NW-HD1
•
Note for Printed Wiring Boards and Schematic Diagrams
•
MAIN and HDD boards are multi-layer printed board.
However, the patterns of intermediate-layer have not been in-
cluded in diagram.
Note on Schematic Diagram:
•
All capacitors are in
µ
F unless otherwise noted. (p: pF)
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.
•
f
: internal component.
•
C
: panel designation.
•
A
: B+ Line.
•
Power voltage is dc 4.2 V and fed with regulated dc power
supply from CN9501.
•
Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : PLAYBACK
•
Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
•
Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
•
Circled numbers refer to waveforms.
•
Signal path.
F
: AUDIO
Note on Printed Wiring Board:
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
f
: internal component.
•
: 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
(Conductor Side)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component Side) the parts face are indicated.
surface
Lead layout of conventional IC
CSP (chip size package)
• The voltage and waveform of CSP (chip size package)
cannot be measured, because its lead layout is different
form that of conventional IC.
•
Lead Layouts
*
Replacement of IC1003, 1101, 2001, 3001, 7001 and 7002
used in this set requires a special tool.
*
Replacement of IC1003, 1101, 2001, 3001, 7001 and 7002
used in this set requires a special tool.
Note:
The components identi-
fied by mark
0
or dotted
line with mark
0
are criti-
cal for safety.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque
0
sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce por tant le numéro
spécifié.
1.
DIAGRAMS
Summary of Contents for Walkman NW-HD1
Page 67: ...19 NW HD1 MEMO ...
