JRC NCR-330 User manual

1. OPERATIONAL DESCRIPTION
No. ITEM OPERATION, INDICATION
1 Power lamp Activate the green lamp to indicate that the power has
been turned on.
Power on
(Normal) Press and hold POWER switch for at least two seconds.
Power on
(Initialize) While holding down TEST switch turn power back on by pressing the POWER switch.
2
Power off Press and hold POWER switch for at least two seconds.
3 Receive lamp This lamp turns on during signal detecting and blinks
during message text receiving.
4 Self-diagnostic
Test Press TEST switch.
5 Setting of
Illumination Press DIMMER switch.
6 Paper lamp This orange lamp blinks to indicate that equipment has
run short of paper.
7 Feed the paper Press FEED switch.
8 Alarm lamp The red lamp blinks to indicate that an alert message
is received.
9 Stop the Alarm Press ALARM OFF switch.
10 Menu start / end Press MENU switch.
11 Enable Press ENT switch.
12 Disable Press CLR switch.

13 Confirmation of
Programmed Status Press STATE switch.
14
15 Change the symbol Alphabet Press ∆, ∇switch.
16 Symbol Alphabet Indicates the selected letter(B1 or B2).
The lamp at the bottom right of the display
Enabled: ON
Disabled: OFF
FUNCTION SETTING
The equipment allows you to select a receiving coast station, a message type, and
receiver status.
No. ITEM SWITCH PRINT, INDICATE NOTE
1State start MENU STATE PROGRAM START
Select station
Set ENT SET COAST STATION?
∆Ascending orderChange
Station ∇Descending order
Enable ENT Bottom right lamp turns on
Disable CLR Bottom right lamp turns off
Detect MENU **Disabled Area : To No.3
2
No set CLR SET COAST STATION? To No.3
Select message
Set ENT SET MESSAGE TYPE?
∆Ascending orderChange
message ∇Descending order
Enable ENT Bottom right lamp turns on
Disable CLR Bottom right lamp turns off
Detect MENU **Disabled Message Type:
3
No set CLR SET MESSAGE TYPE? To No.4
Select state
Set ENT SET STATE?
Alarm ENT / CLR ALARM SOUND ON?
ON / OFF ON : ENT OFF : CLR
Character
size ENT / CLR CHARACTER SIZE LARGE? Large / Normal L : ENT N : CLR
4
No set CLR SET STATE?
STATE END State end
5State end MENU STATE END

2.1 Introduction
JRC NAVTEX Receiver, Model NCR-330 is designed in compliance with the IMO
performance standard for narrow band direct printing telegraph equipment for the reception
of navigational and meteorological warning and urgent information to ship.
JRC NAVTEX Receiver is composed of Receiver, Main Processor.
2.2 BLOCK DIAGRAM
The receiving signal on 518kHz ±85Hz input from antenna terminal is converted to the
baseband signal in the CMN-2330 Receiver and output to the CDJ-2330 Main Processor.
The signal input to CDJ-2330 is bit-synchronized and flame-synchronized, then edited
according to the procedures described on ITU-R. 476-5, 540-2, 625-3(B) respectively.
Then the edited message is output to the thermal printer.
The control signals generated by the control panel is input to CDJ-2330 Main processor, then
control the functions of the equipment.

2.3 CMN-2330 RECEIVER
2.3.1 Composition
The CMN-2330 Receiver is composed of following section:
1) Power supply section
2) Receiver section
3) Input/Output section
2.3.2 Specification of input and output
1) Power supply section
Input voltage : DC 10.8V∼35V
Output voltage : +5V
+9V
2) Receiver section
Input frequency : 518kHz
Input impedance : 50Ω
High-impedance
Output frequency : 1,700Hz ±85Hz
0dBm (600Ω, UNBAL.)
2.3.3 Description of operation
1) Power supply section
The power supplied through the terminal board (TB1-11,12) passes the fuses (F1,F2),
the switching regulator of 5V (IC2) and contact point of the relay (K2), then enters
to 9V regulator (IC9).
The power supply is turned ON by pressing the POWER key on the control panel which
sets the D-Flip Flop (IC8) over 2 second and turns the power supply relay (K2) ON.
And as the power supply is ON, the power supply is turned OFF by pressing the
POWER key over 2 second, which resets the D-Flip Flop (IC8).
When the polarity of the power supply is wrong, current flows through CD8 and F1,
then blows the fuse F1.
All the digital circuit in the equipment function on 5V and analog circuit on 9V.
2) Receiver section
For 518kHz signal input, there are 3 ports namely HIGH-Z terminal to connect with
the wire antenna etc., input terminal for 50Ωantenna and terminal for the dedicated
Navtex Receiver Antenna unit (NAW-330).
Received input signal passes the protection circuit composed of diodes (CD17,18,
CD13-16) and is supplied to the tuning circuit(T1,C70).
Then after passing further 2 stage of the tuning circuit, the signal is amplified by the
FET AMP (TR1).
Then its bandwidth is limited to 518kHz ±250Hz by the Mechanical filter (FL1) and
the signal is amplified and mixed with BFO signal by IC1 and becomes signal of
1,700Hz ±85Hz then appears to the FS OUT (ST1-1) as output.
The signal input from “FS IN”(ST1-2) is sent to the Main Processor.
The BFO consisted of crystal oscillator (X1) and transistor (TR6), oscillates the
4130.4kHz.

The generated signal is supplied to IC1 to get audio signal and the mixer IC (IC4) for
self test.
In the self test circuit, 516.3kHz fed from BFO is mixed with 1,700Hz ±85Hz fed
from Main Processor at the mixer (IC4) and 518kHz ±85Hz is obtained.
This signal is supplied to the receiver section via T3 to check the receiving circuit.
During self test, the break-in(BK) relay is turned ON to shut the input from outside.
The break-in(BK) circuit has purpose to protect the receiver against excessive input
induced on the antenna.
This circuit consists of photocoupler (PHT1), transistor (TR3). To the BK terminals
(TB-6,7) 12V ∼24V can be input.
3) Input/Output section
The input/output section is to relay input/output between the Main Processor and
external equipment. The input /output section is RS-422A, Current circuit and
external alarm signals.

2.4 CDJ-2330 MAIN PROCESSOR
2.4.1 Composition
The CDJ-2330 Main Processor is composed of following section:
1) Demodulator section
2) CPU section
3) Printer section
2.4.2 Description of operation
1) Demodulator section
Demodulator section is composed of DSP(Digital Signal Processor), Codec
and other IC. A part of input signal from FS IN (CMN-2330) is fed to the
Codec IC(IC13) and DSP(IC2).
This circuit is the Digital Signal Processing IC which generates 0V when the
input frequency is 1785Hz and +5V when the input frequency is 1615Hz.
2) CPU Section
CPU section is composed of CPU(Central Processing Unit), Oscillator, ROM
(Read Only Memory) , RAM(Random Access Memory), EEPROM(Electrically
Erasable Programmable Read Only Memory), PLD(Programmable Logic
Device) and Driver.
The H8 CPU (IC1) processes the signals received and demodulated by DSP
according to the program stored in IC3 (ROM) to transmit print data to the
Printer. At the same time, the H8 supervises the state of the switch, and
controls the state of the system.
The Oscillator (IC17) generates the clock signal to operate the CPU.
The Address Decoder (IC15) selects IC’s according to the address data given
by the CPU. The ROM (IC3) has the size of 64kB, and saves a program that
controls the system. The RAM (IC7) has the size of 32kB.
It works as the buffer memory to store receiving data, and provides a work
area. Necessary data including the information sent from the switch is
preserved by the back-up battery for more than 24 hours after power-off.
Timer in the CPU(IC1) generates interrupt signal for bit synchronization
processing, ALARM signal, and self-diagnostic test signal.
The Output port in the CPU(IC1) outputs print data and control signal to
the Printer, scan signal to the switch, and control signal to the DSP.
The Output port in the CPU outputs control signal to the led.
The input port inputs switch signal, state of the Printer and Paper-Out
detection information.
3) Printer section
Printer section is composed of Driver(IC12), Printer(PRT1) and other IC.
The driver(IC2) receives print data from CPU(IC1), and outputs signal to
the Printer(PRT1).
The Printer(PRT1) prints out the receiving data, status etc.