12
ICD-ST25
SECTION 4
DIAGRAMS
Note on Schematic Diagrams:
• All capacitors are in µF unless otherwise noted. pF: µµF
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 3V and fed with regulated dc power
supply from DC IN jack (J5001).
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : PB
[
] : 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.
• 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
: PB
L
: REC
✩
Replacement of IC6001 used in this set requires a spe-
cial tool.
•
The voltage and waveform of CSP (chip size package)
cannot be measured, because its lead layout is different
from that of conventional IC.
Caution:
Pattern face side:
Parts on the pattern face side seen from
(SIDE B)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(SIDE A)
the parts face are indicated.
•
MAIN board is multi-layer printed board. However, the
patterns of intermediate-layer have not been included in
the diagram.
✩
Replacement of IC6001 used in this set requires a spe-
cial tool.
•
Lead layouts
• WAVEFORMS
4
IC7003
<z/,
(XTAL)
1 V/DIV, 100 ns/DIV
3.4 Vp-p
244 ns
Note on Printed Wiring Boards:
•
Y
: parts extracted from the conductor side.
•
b
: Pattern from the side which enables seeing.
The other layers’ patterns are not indicated.
surface
Lead layout of
conventional IC
CSP (chip size package)
Summary of Contents for ICD-ST25 Digital Voice Editor 2
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