Samyung SRG-315DN, Руководство пользователя

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(5) Control Circuit
The control part consists of CPU(IC30),
EEPROM(IC33,37), REAL TIME CLOCK(IC28),
CLOCK Generator(X3), RS-232/422 Data Com-
device,
MODEM, Audio amplifier(IC32), I/O
Amplifier, IC(IC22,IC42,IC46,IC48), LCD Contrast /
DIMMER Control Circuit and it controls the whole
operation of the unit with the data signals of RS-
422/232 from front PANEL operation, external
connecting devices, interface.
CPU device is set by operating PANEL and set
synchronizing circuit responded by receiving
frequency (selecting channel). Then, according to
receiving
frequency, set information setting
frequency for SYNTHESIZER or REF/BFO. In
addition, the CPU pass signal (LOCAL CONTROL) to
indicate various information (receiving frequency,
receiving mode, band, width) set by operating
panel of controller unit and transmit in control unit.
Except this function, in case of interception of
power or supply-cease, the CPU control memory
degaussing to be back-up by battery built. Memory
status before normal of power and in case of
normal, possible to rebuild.
12.3. MH/HF Transmitting Filter Circuit (T-1101)
This PCB circuit converts the TX/RX signal as
Relay (RY17) by a TX+ (+12V).
The signal comes from whip antenna is
transferred to a main board (T-1110) through
Diminishable Relay, BK Relay, Over-input protect
circuit and it receives a TX signal from PA board (T-
1113) and select the proper filter in a frequency
band and then, remove the harmonic wave and
transferred to antenna through power sensor circuit.