Panasonic KX-TC1045RUB Service Manual ▷ View online
23
B
LO
C
K
D
IA
G
R
A
M
(H
A
N
D
S
E
T)
TX DATA
RX DATA
1st
Mixer
Mixer
RX Filter
ANT
RECEIVING FREQUENCY
30.075~30.300MHz
30.075~30.300MHz
1st
Local
Local
TX
Filter
Filter
TX
AMP
AMP
TX
VCO
VCO
CONTROL
DATA
DATA
2nd
Mixer
Mixer
IF AMP
DET
1st IF
Filter
Filter
2nd IF
Filter
Filter
DATA
Filter
Filter
DATA
AMP
AMP
PRE-
AMP
AMP
LINE
AMP
AMP
RECEIVER
150
150
EXPANDER
BATT LOW DET
/POWER DOWN
/POWER DOWN
MIC
Battery
COMPRESSOR
MODULATION
LIMITTER
PLL
X201
11.150MHz
11.150MHz
IC301
SENDING FREQUENCY
39.775~40.000MHz
39.775~40.000MHz
19.375
~19.600MHz
~19.600MHz
2nd Local 11.150MHz
1
2
3
2
3
X102
3.991MHz
X901
32.76KHz
MIC
AMP
AMP
CPU
IC901
IC101
CHARGE
DETECT
DETECT
RESET
TX Signal
RX Signal
45
K
X
-TC1045RU
B
24 NEW CIRCUIT OPERATION (HANDSET)
24.1. RECEIVER RF IF CIRCUIT
24.1.1. Circuit Operation:
The signal of 30 MHz band (30.075 MHz~30.300 MHz) received at ANT is filtered by DUP101, and it is input to Pin 42of IC101.The
RX VCO which oscillates at T201 and IC101 is locked to 1st Local frequency by PLL inside IC101. (PLL is controlled by serial data
output from Pin 28 , 29 and 30 of IC901.)An input signal from Pin 42 of IC101 and 1st Local frequency output from RX VCO are
mixed inside IC101, pass through CF1, and 1st IF frequency of 10.700 MHz is generated.Further, 10.700 MHz and 11.150 MHz that
oscillated at X101, passes through MIXER inside IC101 and is filtered at CF2 and outputs 2nd IF 450 kHz.
RX VCO which oscillates at T201 and IC101 is locked to 1st Local frequency by PLL inside IC101. (PLL is controlled by serial data
output from Pin 28 , 29 and 30 of IC901.)An input signal from Pin 42 of IC101 and 1st Local frequency output from RX VCO are
mixed inside IC101, pass through CF1, and 1st IF frequency of 10.700 MHz is generated.Further, 10.700 MHz and 11.150 MHz that
oscillated at X101, passes through MIXER inside IC101 and is filtered at CF2 and outputs 2nd IF 450 kHz.
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KX-TC1045RUB
24.2. RECEIVER SIGNAL CIRCUIT
24.2.1. Circuit Operation:
After getting the 450kHz signal, it is input to Pin 33 of IC101 and passes through IF AMP and Detector Circuit, then are output to
Pin 26 . AF signal flows through R123, C124. Its level is controlled by the VOLUME CONTROL Amp of IC101. The signal is
received at Pin 25 of IC101, then it passes through the following circuits: PREAMP, Expander and Amplifier: It goes out at Pin 16
and finally is sent to the SP. Inside IC101, RX-MUTE, MIC-MUTE and PLL circuits are controlled by the serial data that the CPU
send from Pins 28, 29 and 30.
Pin 26 . AF signal flows through R123, C124. Its level is controlled by the VOLUME CONTROL Amp of IC101. The signal is
received at Pin 25 of IC101, then it passes through the following circuits: PREAMP, Expander and Amplifier: It goes out at Pin 16
and finally is sent to the SP. Inside IC101, RX-MUTE, MIC-MUTE and PLL circuits are controlled by the serial data that the CPU
send from Pins 28, 29 and 30.
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KX-TC1045RUB
24.3. TRANSMITTER SIGNAL CIRCUIT
24.3.1. Circuit Operation:
Input signal from MIC passes through the filters arranged by C202, VR201, R201 and C203, R203 and it is input to the Pin 9 of
IC101. Inside it, the signal passes through the MIC AMP and Compressor circuits and SPLATTER FILTER is output to Pin 3. It
flows through R204, C221, R221, then is input to modulator circuit.
IC101. Inside it, the signal passes through the MIC AMP and Compressor circuits and SPLATTER FILTER is output to Pin 3. It
flows through R204, C221, R221, then is input to modulator circuit.
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KX-TC1045RUB
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