8
NW-MS77DR
• WAVEFORMS
IC731
8
OSCOUT
VOL/DIV : 0.5 V AC
TIME/DIV : 10
µ
sec
1.1 Vp-p
32KHz
1
Note on Schematic Diagram:
• 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
• Voltages are taken with a VOM (Input impedance 10 MW).
Voltage variations may be noted due to normal production toler-
ances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production toler-
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.
• IC461, 463 (frash RAM)) on NAND board cannot be replaced
individually.
Replace it with NAND 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.
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
individually.
Replace it with NAND board assembly for service.
– MAIN BOARD –
