Read Sony ICD-ST25VTP Service Manual online
12
ICD-ST25VTP
SECTION 4
DIAGRAMS
Note on Schematic Diagrams:
• All capacitors are in
• 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.
•
: B+ Line.
• Power voltage is dc 3 V 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
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 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
: PB
L
: REC
✩
Replacement of IC6001 used in this set requires a special tool.
• The voltage and waveform of CSP (chip size package) cannot be
measured, because its lead layout is different from that of conven-
tional IC.
tional IC.
Note on Printed Wiring Boards:
•
•
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
(SIDE B)
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.
•
Waveforms
• 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 special tool.
• Lead layouts
surface
Lead layout of
conventional IC
CSP (chip size package)
1 V/DIV, 40 ns/DIV
3.3 Vp-p
88.5 ns
1
IC6003
3
(XXT)
1 V/DIV, 40 ns/DIV
2
IC6003
1
(FOUT)
88.5 ns
4.1 Vp-p
1 V/DIV, 40 ns/DIV
3
IC3004
6
(MCLK)
88.5 ns
4.1 Vp-p
1 V/DIV, 10
µ
s/DIV
6
IC7004
5
(FOUT)
30.5 ns
3.2 Vp-p
1 V/DIV, 40 ns/DIV
5
IC8001
qd
(X OUT)
(When the USB is connected)
1 V/DIV, 100 ns/DIV
4
IC7003
<z/,
(XTAL)
3.4 Vp-p
244 ns
3.7 Vp-p
8.33 ns
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