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TM-V7A/E
CIRCUIT DESCRIPTION
Unlock Circuit
The signal whose phase has been compared from the
not transmit and does not send the transmission signals to
PLL ICs (IC6 and IC7:
MB1511PFV-GBND)
is output, goes
the shift registers.
The microprocessor also generates the
through
the
waveform
circuit,
and
is input
to
the
beep to announce the unlocking.
Unlocking is announced
microprocessor.
lf the level after waveforming is low, the
in the same manner for reception too.
microprocessor judges this to be the unlock signal and does
-© Vec(5V)
0
wos
cos
C422
<<
LD
(C421)
| /-—*
DB
Mi
(D7
icroprocessor
_
ce
10716)
esl
esl
oo
o°8
The figures in parentheses
al
( )are for the 430MHz band
Fig.5 Unlock circuit
AF Signal System
The RAV and RAU detection signals for the 144MHz
For DTSS operation, the signals are output from ANO1
band. and the 430MHz band and the VO signal from the
of the microprocessor as the monitor.
These signals are
audio composite unit are converted to beep signals by the
switched by the cross point switch (1C503)and are input to
cross point switch (IC503: JLC1555F), the level is adjusted
the electronic control (IC504).
While the beep signal is
by the electronic control (IC504:
MB87032APFGBND), the
output from the microprocessor,
audio signals for each
result goes into the cross point switch (IC503) again, goes
band are muted by the cross point switch (IC503) with
through the speaker switching circuit, and is output to the
theserial data from the microprocessor (IC508).
power amp and headphone jack.
The signals output from the electronic control (1C504) go
into the cross point switch (IC503) again, go through the
@Beep circuit and mute circuit
audio output mute circuit (Q8 and Q9), and are input to the
When a key is pressed, the beep is output from P32 of
speaker switching circuit.
The data transmission from the
the microprocessor (IC508).
microprocessor to the electronic control (1C504) is the same
as for the TM-733A/E.
RAU
>
(")
AQO
Cross point switch
To Speaker
IC503
Switching circuit
RAS >
(m2)
AOI
y
Al
ELE VOL
10504
BEEP DTMF
DATA
Microprocessor
IC508
Fig.6 AF Block diagram
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