Sony SPP-ID970 - Cordless Telephone, Руководство по обслуживанию

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SPP-ID970/ID971
2-2. SCHEMATIC DIAGRAM — HANDSET SECTION —
For printed wiring boards
•
X
: parts extracted from the component side.
•
: Carbon pattern.
•
z
: Through hole.
•
b
: Pattern from the side which enables seeing.
(The other layer’s 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.
For 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.
•
C
: panel designation.
•
U
: B+ Line.
• Power voltage is dc 3.6 V and fed with regulated dc power
supply from battery terminal. (HANDSET)
• Voltage is dc with respect to ground under no-signal
condition.
∗
: 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.
• Signal path.
N
: TX (To Tel Line)
O
: RX (From Tel Line)
P
: bell