5
5
IT-B1
3-2. SCHEMATIC DIAGRAM — HANDSET SECTION — • Refer to page 7 for IC Block Diagrams.
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.
•
%
: indicates tolerance.
•
¢
: internal component.
•
C
: panel designation.
•
U
: B+ Line.
• Connect J2 and J3 with handset cord.
Power voltage is dc 12V and fed with regulated dc power
supply from J3 with 100
Ω
in series.
• Voltage is dc with respect to ground under no-signal
condition.
no mark : OFF HOOK
(
) : ON HOOK
• 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
• Abbreviation
MX
: Mexican model
LA
: Latin American model
