Overview Of Boards; Input/Output Specifications; Receiver Unit - Furuno NX-700B Service Manual

3. Overview of boards

RCV (08P3227)
The RCV board is incorporated in the Receiver unit.
NAVTEX signals are received at 518 kHz, 490 kHz or 4209.5 kHz. It is converted to
FSK signal at 1700 Hz + 85 Hz: BY signals of 0 and 1. And then, and sends them to
the Display unit via RS-485.
PWR (08P3226)
The PWR board is incorporated in the Display unit NX-700A (printer incorporating
type) to supply power to the printer. The board outputs power +5.2 VDC from the input
power (+12 VDC to +24 VDC).
CPU (08P3225)
The CPU board is incorporated in the LCD display unit (NX-700B). The board is
comprised as follows.
- CPU block (system control, handling NAVTEX signals: decodes BY signals sent
from the RCV board, makes them up as received messages, and displays and stores
them.)
- power supply block
Printer (µTP58E-FU)
The printer is a serial printer of the NX-700A (Printer-incorporating type).

5.2.2 Input/output specifications

1. Receiver unit

Pin No. Signal
J402 (I/O: WAGO terminal)
1 TD-A
2 TD-B
3 GND ISO
4 RD-A
5 RD-B
6 FG
J403 (I/O: WAGO terminal)
1 Alarm-H
2 Alarm-C
3 FG
4 SD
5 RD
6, 7 FG
8 NC
Table 5.2.1 Specifications of Input/Output of Receiver unit
IN/OUT
IEC61162-1/2: RS-485
OUT
(INS Data output)
Isolation ground
IEC61162-1/2: RS-485
IN
(GPS data/ INS Data input)
Photo MOS relay contact output for external alarm
OUT
(50 VDC / 0.5 A max.)
OUT RS-232C external printer signal
(For NX-700B only, NC signal for NX-700A)
IN
5-3
Specifications
5.2 Connection