Schematic Diagram -Base Main (1/3) Section - Sony SPP-888 Service Manual

5-7. SCHEMATIC DIAGRAM — BASE MAIN (1/3) SECTION —
Note:
• 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
/ W or less unless otherwise
4
specified.
• ¢ : internal component.
• U : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 12 V and fed with regulated dc power
supply from J101 with 100 Ω in series.
• Power voltage is dc 9 V and fed with regulated dc power
supply from external power voltage jack.
• Voltage is dc with respect to ground under no-signal
condition.
no mark : TALK
∗
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
N
: RX (from TEL LINE)
O
: TX (to TEL LINE)
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SPP-888
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