Furuno 1622 - 2.3 Scanner Unit

2.3
!
Scanner Unit
5
2.3 Scanner Unit
The scanner unit features that;
1) The powers supply circuit for the scanner unit is provided on the SD board.
2) The SD board in the scanner unit communicates with the display unit.
3) Auto-gain and auto-STC circuits make operation easy.
The TX trigger from the display unit is modulated and oscillates the magnetron. The received
echo is fed to the MIC and is amplified at the IF amp. The output is divided two lines: one is led
to the display unit and the other is applied to the interface for auto-gain and auto-STC functions.
Figure 2-3. Block Diagram of Scanner Unit
INTERFACE
POWER
SUPPLY
IF AMP
MODULATOR
MD Board 03P9270
MIC
Circulator
M
ANT.
Magnetron
E3588
(V801)
RM-9455
(B801)
03P9267
RU-9458
(U801)
IF Board 03P9269
INT Board 03P9271
VIDEO
IF
TUNE
GAIN
Auto Gain
Auto STC
Auto Tune
Communication
Motor Drive
A/C SEA
TUNE
COM
Display
Unit
BP/MD
12V
8V
TX-HV
5V
TRIGGER
SHIP’S
MAINS