Kenwood TM-D700A Service Manual page 14

TM-D700A/E
CIRCUIT DESCRIPTION
6-2. Speaker Switching Circuit
ELECTRONIC
CROSS POINT SW
VOLUME
MUTE
POWER AMP
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Z so [5_
Ress |_? MUTE CN800
8
RAV >—
W AMY
QB04
>
394
IC 808
7
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AOO —
RAU >— AM, 1 6 ie 1 6
Q805 - >—
IC 807 5 5
m J801
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D803
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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
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R803 Ir °
MIC UP AN, I g
R805 7],
MIC DW WW
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INT3 < 4
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NOW
4
4
a=
Assesses
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KEY INPUT INTERRUPT CIRCUIT
a
2 FS 3S >
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Fig.17 Microphone key input circuit
14