Furuno FAR-2107 Series Service Manual page 516

3. Outline of Board
Board name
IF AMP 03P9335C
RFC 03P9444
50 kW: 03P9348D
PWR
60 kW: 03P9348E
PFN1 03P9431
50 kW: 03P9432
PFN2
60 kW: 03P9445
PFN3 03P9433
BP GEN 03P9347
50 kW: 03P9436
TB RF
60 kW: 03P9439B
50 kW: 03P9435
TB IF
60 kW: Non
50 kW: Non
BUF
60 kW: 03P9446
50 kW: RU 9602
MIC
60 kW: RU 9760
50 kW: 9M31
Mag.
60 kW: MG5240F
50 kW: RC 3686H
Circulator
60 kW: RC 6584S
IF board (03P9335-C) is commonly used as for FRA-2xx7
series.
IF board consists of the 60 MHz semi-log amplifier and
video detection circuits. Superimposed 60 MHz IF signals
and Video signals are sent to RPU-013.
Serial data sent from the SPU board to the RFC board
includes GAIN, STC and TUNE control signals. These
signals are processed on the RFC board to control the PFN
board, IF board, PWR (RF) board and MIC of TR Unit.
The RFC board converts H.D and B.P signals, TUNE IND
voltage, Magnetron current and DI-MON voltage, and power
of +12 V, -12 V, +5 V and 32 V to serial data for monitor of
TR Unit, and send them to the SPU board.
The power is supplied in + 24 VDC from RPU-013, and the
following voltage is generated in the PWR board.
"+5 VDC, +12 VDC, +32 VDC, -12 VDC and Heater voltage"
PFN1 board is drive circuit (transformer) to control three
SCR.
PFN2 board is the Pulse Forming Network (PFN).
Capacitors and coils are switched by relays to determine the
TX pulse length.
The PFN3 board consists of the magnetron current
detection circuit and the choke coil of the magnetron heater.
The BP GEN board is commonly used as for FRA-2xx7
series.
H.D and B.P signals are sent from BP GEN board to RFC
board. B.P is outputted at 265 pulse/rev. S-band, 360
pulse/rev. X-band. These signals are sent to SPU board as
serial data.
For terminal board
For relaying the IF output.
For relaying the RFC and PFN1 boards.
The MIC consists of local oscillation circuit, LNA circuit and
frequency conversion circuit, which converts received
signals to IF signals of 60 MHz.
Pulse voltage is increased on the pulse transformer and
50/60 kW is generated to make the Magnetron oscillate.
The circulator performs switching between transmitting and
receiving circuit. The circulator has three I/O ports and has a
permanent magnet and ferrite core arranged in the center. It
serves to output electromagnetic waves coming from one
port to a particular direction.
9-12
9.4 Block Description
Table 9.4.1 Outline of Board
Outline