32
32
SPP-888
5-8. SCHEMATIC DIAGRAM — BASE MAIN (2/3) SECTION — • Refer to page 40 for IC Block Diagrams.
(P
age 33)
(Page 31)
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
/
4
W or less unless otherwise
specified.
•
2
: nonflammable resistor.
•
C
: panel designation.
•
U
: B+ Line.
• 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
• 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
: RX (from TEL LINE)
O
: TX (to TEL LINE)
P
: bell
