Function Of Each Board (Display Unit) - Furuno FR-1505 MARK-3 Series Service Manual

Function of Each Board (Display Unit)

Board Name
1) Contains a video amplitier circuit.
2) Performs A/D conversion of video signal. (16 gradation)
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.
7) Displays navigation data being fed from a navigator.
8) Reads and displays trackball, EBL, and VRM data.
9) Controls tuning circuit.
10) Outputs Tx trigger and pulselength signals to antenna unit.
SPU Board
11) Backs up menu settings, tune voltage, and tune Ind. voltage, with the EEPROM.
03P9230
12) Echo Stretching 2/3.
13) Generates menus.
14) Echo trailling.
15) Checks for the presence of ARP and RP boards at power-up.
16) Outputs HD, BP, TRIG and VIDEO signals for radar slave display. (J204)
17) Receives HD, BP, TRIG and VIDEO signals from other radar. (J205)
18) Outputs ARPA data to the external equipment. (ARP-10:NMEA 0183, TTM,
19) Outputs external buzzer signal. (J211)
20) Outputs V-SYNC, H-SYNC, R, G, B to a PC monitor or hard copier. Abuffer
21) Inputs speed log signal, contact-closure. (J210)
22) TWO NMEA input ports. (J202, J203)
23) ONE NMEA output port. (J202)
1) Converts GAIN-, STC-, FTC-, and I/R-processed video signal to quantized video
2) Performs automatic and manual target acquisition and tracking.
3) Detects and displays HD, BP, TRIG, VIDEO, LOG and GYRO signal errors.
ARP Board
4) Outputs ARPA data to the external equipment. (ARP-17: NMEA 0183, TTM,
18P9004/
18P9007
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, marks, and ship's tracks, etc.) for the
2) Backs up data such as ship's tracks and marks.
RP Board
3) Reads and displays digitized charts.
03P9259
4) Outputs plotter display data to the SPU Board.
5) Inputs/outputs data (track, marks etc.) from/to the RAM card.
6) RP program stored onto the flash ROM is updated with a PC.
(a) Applies GAIN, STC, FTC and IR to video signal and outputs to the A/D
converter.
(b) Adjusts video signal input level (EEPOT).
(c) Changes STC curve according to the antenna height set on the Radar menu.
(d) Echo Stretching 1.
J202)
circuit required. (03P9229)
(QV) and sends back to the SPU Board.
18P9004, J2, XH-5P)
plotter display.
Function
2-3