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Details power requirements and suitable power supply for the SN-100 unit.
Specifies load and resistance requirements for the SSB terminal during testing.
Procedure to set the Identification (ID) for MMSI, involving key presses.
Guides on setting system parameters, including inputting MMSI numbers of different lengths.
Lists the main components of the SN-100, including NBDP receiver, CPU, and power supply.
Details the Connection Board (T-020/G-1151) and its role in signal processing.
Explains the NBDP Receiving Unit (T-022/T-132) and its internal components.
Describes the PLL Board (T-023/T-133), its synthesizer function, ICs, and VCO.
Details the Power Circuit (T-025) responsible for supplying constant DC power to the unit.
Illustrates and explains the rear panel connectors for various interfaces and power.
Troubleshooting steps for power supply failures, including voltage and fuse checks.
Guidance for resolving screen display problems like blank screens or distorted images.
Steps to diagnose and fix problems with receiving NBDP data, checking signals and connections.
Steps to diagnose and fix problems with transmitting NBDP data, checking connections and signals.
Information on troubleshooting or adjusting the simple modulator for proper operation.
Important safety and handling precautions for maintenance, testing, and modulation.
Diagram illustrating the functional blocks and signal flow of the SN-100 NBDP system.
Diagram showing terminal connections and wiring for the SN-100 NBDP unit.
Diagram of the SN-100 NBDP PLL Synthesizer board (T-133) and its connections.
The SAMYUNG SN-100 is a service manual for a device that functions as a main receiver for NBDP (Narrow-Band Direct-Printing) communications. It is designed to be interfaced with other SAMYUNG equipment, specifically the SRG-1150DN/1250DN, SEG-2150DN/2250DN, and SRG-3150DN, indicating it is part of a larger communication system, likely for maritime use given the NBDP context. The device is not intended to operate as a standalone unit.
The SN-100's primary function is to receive and process NBDP signals. It comprises several key internal boards: a CONNECTION BOARD, CPU BOARD, PLL BOARD, and POWER SUPPLY.
The CONNECTION BOARD (T-020 / G-1151) acts as an intermediary, linking the CPU BOARD with other PCBs involved in receiving NBDP signals. It receives processed signals from the NBDP Receiving Unit (T-022 / T-132) and then delivers them to the SRG-1150DN / SRG-1250DN.
The NBDP Receiving Unit (T-022 / T-132) is the core receiving component. It integrates a frequency filter, amplifier, MIXER, ATT (attenuator), AGC (automatic gain control), and B.K control unit. Signals received via the MF/HF Antenna are first amplified by a wide amplifier and then split into two paths by a SPLITTER (SP1). Within this unit, specific filters (U4 and U6) are selected based on the incoming frequency. The signal is then mixed with a 1st LOCAL signal (from IC2), a 2nd LOCAL signal (from IC1), and a BFO (Beat Frequency Oscillator) signal (from U1) to generate MARK (1.7KHz+80Hz) and SPACE (1.7KHz-80Hz) signals. One output path from this unit is directed to the SRG-3150DN via an attenuator and matching tool.
The PLL BOARD (T-023 / T-133), or SYNTHERSIZER PLL PCB, is responsible for frequency synthesis. It utilizes a PLL IC and a VCO (POS-100) to form the PLL. This board generates the 1st LOCAL input signal. A 7 MHz signal from the PLL IC (IC15) is multiplied seven times to produce a 49 MHz signal, which serves as the 2nd LOCAL. The BFO signal is derived from DM1, receiving a 7 MHz signal to generate 456.7 kHz. The PLL BOARD also communicates with the CPU BOARD to generate control signals for the NBDP receiver.
The POWER CIRCUIT (T-025) ensures a stable power supply to all components. It converts the main DC 24V power, supplied when the device is turned on, into regulated constant voltages of +12V, +8V, and +5V. A safety feature is included: if the input voltage exceeds +32V, the power automatically shuts off. It also incorporates a prevention circuit for receiving voltage.
The SN-100 requires a DC24V power supply with a 30A capacity. The SP-1250ADC is recommended for compliance with IMO regulations.
For MMSI (Maritime Mobile Service Identity) number input, a specific sequence of key presses is required: "Shift + Alt + F10" simultaneously, which will produce an audible sound. After this, any input or adjustment must be initiated by pressing "F10" in the main MENU. To input a 5-word MMSI, select "Setting For System" (No 0) and press "ENT". For a 9-word MMSI, select "Setting For System" (No 1) and press "ENT". The "ESC" key is used to return to the previous menu.
For transmission testing, the device must be connected to a load of over 50Ω and a resistance of 300W at the SSB terminal.
The rear panel of the SN-100 provides various connectors for system integration:
Troubleshooting guidance is provided for common issues related to power supply, screen display, NBDP data reception, and NBDP data transmission.
General| Resolution | 1280 x 800 pixels |
|---|---|
| RAM | 2 GB |
| Operating System | Android |
| Connectivity | Wi-Fi, Bluetooth |
| Ports | USB |
| Display | 10.1 inch TFT LCD |
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