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ICD-MS1
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5-4.
SCHEMATIC DIAGRAM – MAIN/SW Board –
•
See page 36 for Waveforms.
•
See page 37 for IC Block Diagrams.
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.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
%
: indicates tolerance.
•
f
: internal component.
•
C
: panel designation.
•
U
: B+ Line.
• Power voltage is dc 3 V and fed with regulated dc power
supply from external power voltage jack.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : PLAY
(
no mark : PLAY
(
) : REC
∗
: Impossible to measure
• 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
L
: REC
• The voltage and waveform of CSP (chip size package) can-
not be measured, because its lead layout is different form
that of conventional IC.
that of conventional IC.
*
Replacement of IC722 used in this set requires a
special tool.
special tool.
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