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KX-T4330
CIRCUIT OPERATION (KX-T4330R)
M@ OPERATION IN THE STANDBY MODE
1-1.
Operation in the Standby position.
1. Acall signal comes from the base unit.
2. Ating signal for incoming calls can be made from an outside caller.
3. Acall signal can be sent to the base unit.
1-2.
Receptlon Operation
a) 1C101 reads the output from waveform shaping circuit when a channel has enough signal strength.
.
b) A signal is received by the Flexible antenna and is passed through a 46 MHz band lilter T2, T3 and T4, amplified by the
RF AMP (Q1), and mixed by IC1 lo generate 10.695 Miz of the 1st IF.
This IF signal is then passed through filler (CF 1) and again mixed by IC1 to obtain a 2nd IF frequency of 455 kHz.
This 2nd IF signal is passed through a ceramic filler (CF2), amplilied by IC1 and detected by T7.
:
c) The data component of this signal is sent to Pin 33 of the CPU (IC 101), where it is determined whether or not it matches
the code.
d) When the data matches, a signal is emitted from the magnetic speaker via Q103 and pin 40 of IC101.
A call signal and a ring signal will differ in tone.
1-3.
Transmission operation
Q101, controls the TX power supply, and is brought to the OFF condition by the CPU (IC 101), in the OFF condition the TX
part will not operate.
Circuit Diagram
ANT
TX POWER
TX POWER
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