Function Of Each Board (Display Unit) - Furuno FR-2115 Service Manual

Function of Each Board (Display Unit)

Board Name
1) Contains a video amplitier circuit.
2) Performs A/D conversion of video signal.
3) Echo averaging (EAV 1/2/3)
4) Constructs radar picture from HD, BP, TRIG, and VIDEO signals.
5) Controls keyboard.
6) Mixes data being fed from ARP and RP boards to display them on the screen.
SPU Board
03P9253 7) Displays navigation data being fed from a navigator.
8) Reads and displays trackball, EBL, and VRM data.
9) Controls tuning circuit.
10) Outputs "degauss" signal to the DEGAUSS Board.
11) Outputs Tx trigger and pulselength signals to the antenna unit.
12) Backs up menu settings, radar map, tune voltage, tune Ind. voltage, and
13) Echo Stretching 2/3.
14) Generates menus and radar maps.
15) Echo trailling.
16) Checks for the presence of ARP and RP boards at power-up.
1) Compatible with latest ARP-23 hardware.
2) Converts GAIN-, STC-, FTC-, and I/R-processed video signal to quantized video
3) Performs automatic and manual target acquisition and tracking.
ARP Board
4) Detects HD, BP, TRIG, VIDEO, LOG and GYRO signal errors.
18P9002
5) Calculates CPA and TCPA.
6) Detects land echo.
7) Outputs ARPA data to the SPU Board : Target No., R/B, CPA, TCPA, etc.
8) Processes trial maneuver.
1) Generates data (grid, own ship mark, mark, and ship's tracks, etc.) for the plotter
2) Backs up data such as ship's tracks and marks.
RP Board
14P0298
3) Reads and displays digitized charts.
4) Outputs plotter display data to the SPU Board.
5) Inputs/outputs data (track, marks etc.) from/to the RAM card.
1) Receptacles of ROM and RAM cards.
CARD I/F Board
14P0299
2) Used to stores and retrieves data to/from ROM and RAM card.
1) Outputs HD, BP, TRIG and VIDEO signals to a radar slave display.
2) Receives HD, BP, TRIG and VIDEO signals from other radar. (J458)
3) Inputs/outputs RJ-7 signal. (J458/457)
INT Board 4) Outputs ARPA data to the external equipment. (IEC-61162-2 , J454)
03P9252
5) Outputs external buzzer signal. (J452)
6) Outputs V-SYNC, H-SYNC, R, G, B for a PC monitor or hard copier. A buffer
7) Inputs speed log signal, contact-closure. (J448)
8) Outputs alarm signals, Buffer board required.
(a) Applies GAIN, STC, FTC and IR to video signal and outputs to the A/D
converter.
(b) Adjusts video signal input level (adjusted by pot. VR140).
(c) Changes STC curve according to the antenna height set on the Radar menu.
(d) Echo Stretching 1.
waypoint with the EEPROM (U10).
(QV) and sends back to the SPU Board.
display.
(J442/443, two output ports)
circuit required.
Function
2-3