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TK-701S
The
relationship
between
AC,
QTD
and
signalling
Power supply
squelch output is:
The power supply section consists of RX/TX switch
U16:
MB3756,
018
channel
indicator lamp
regulator,
QTD
AC
Signalling squelch (D202 Cathode)
9.4V and 019 "COM" line regulator, 7.5V in receive both
4
4
L
2S8C1815(BL).
U16:
MB3756
alternately
switches
R8
and T8 by
H
L
H
grounding
the key line, and
supplies
C8
(common,
or
L
4
H
always ON) output, all at 8V.
L
L
H
VIN
-—
UI6
[°°
voo_C8
;
MB
3756
é
——°
vor
RB
5
_8
Status indicators
LEDs; TX and BUSY, and an optional CALL LED.
The TX
LED is red and lights only when transmitting.
The BUSY
LED lights green while the noise squelch is opened.
The
CALL LED flashes yellow while the tone squelch is opened.
j T Voz
TB
There
are two
supplied
and one
optional
indicator
a
of
L778
a
=:
Fig. 4-6 Operational Diagram of U16:
MB3756
UI3
Fig. 4-7 Power Supply and LED Circuit
4-4
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