Kenwood TM-D700A Service Manual

TM-D700A/E
CIRCUIT DESCRIPTION
6-2. Speaker Switching Circuit
There
are
two
speaker
jacks,
J801
and
J802.
The
AF
The
AF
signal
output
combinations
are
as
in
the
speaker
signals
can
be
output
in
various
combinations
matching
the
combination
table
on
the
below.
internal
speakers.
A071
|
400
When
no
external
speaker
is
connected
to
J801,
Pins
5
of
intemal
speakers
only
intemal
speaker
the
multiplexer
(IC807,
1C808)
go
low,
the
AF
signals
AO
0
and
7
extemal
speaker
(J802)
external
speaker
AO
1
are
added
and
input
to
the
power
amp
(C806).
1
external
speaker
(J801)|
Internal
speaker
|
external
speaker
When
an
external
speaker
is
connected
to
J801,
Pins
5
of
2
external
speaker
external
speaker
|
external
speaker
the
multiplexer
(IC18)
go
high
and
AO
0
and
AO
1
are
input
separately
to
the
power
amp.
Table7
Speaker
combination
table
ELECTRONIC
CROSS
POINT
SW
VOLUME
MUTE
POWER
AMP
Ic 702 A014 tC 804 Re57 R874 13 ICB06 s802
Z so [5_
Ress |_? MUTE CN800
8
RAV
>—
W
AMY
QB04
>
394
IC 808
7
| i |
AOO —
RAU >— AM, 1 6 ie 1 6
Q805 - >—
IC 807 5 5
m J801
= S
oye
D803
x
ul =
ws
=
CPU
qi
:
IC 604
<4 _
s=
“he
Fig.16 Speaker switching circuit
6-3. Microphone Key Input
The
microphone
UP/DOWN
and
function
keys
are
pressed,
an
interrupt
is
generated
and
the
microprocessor
is
connected
to
the
microprocessor
analog
input.
The
voltage
awoken
from
stop
mode.
However,
with
the
TM-D700/VE,
the
when
a
key
is
ON
operates
the
corresponding
function.
Also,
power
ON/OFF
switch
function
can
be
registered
to
the
PF
key
the
key
input
interrupt
circuit
is
for
switching
the
power
ON/OFE
on
the
microphone.
with
the
microphone.
When
the
DOWN,
MR,
and
PF
keys
are
M 5C
MICRO
PROCESSOR
5C
MIC
Ses oe
IC
604
8=SsSS=
RB04
MIC PTT AN
vV¥ ag 3
R803 Ir °
MIC UP AN, I g
R805 7],
MIC DW WW
wool
|
ta
|
“5
cee
= 4] $2 re | 06000
INT3 < 4
™ ef
NOW
4
4
a=
Assesses
Icsoo 777 7
E a Z2 +4 0 ce he
KEY
INPUT
INTERRUPT
CIRCUIT
a
2
FS
3S
>
=
Oo
Fig.17 Microphone key input circuit
14

Kenwood TM-D700A Specifications

General

Brand	Kenwood
Model	TM-D700A
Category	Transceiver
Language	English