Why is there no sound from the Furuno FS-1503 loudspeaker?
If there's no sound, check a few things: make sure the [ /4] key is on, adjust the [VOLUME] control, and if "SQ" is on the display, press the [SQL/5] key to disable the squelch. Also, ensure the [RF GAIN] control is turned clockwise.
What to do if the Furuno FS-1503 Telephone output power is reduced?
If the output power is low and the “LOW” indication blinks, the power is automatically reduced to protect against overheating. Wait for the unit to return to normal. Also, check if the fan is working properly.
How to fix poor articulation on Furuno Telephone?
To improve articulation, ensure you're using the correct class of emission for the incoming signal. For example, H3E should only be used on 2182 kHz. If using Custom or ITU channel mode, press the [CLARI/3] key and fine-tune the frequency using the FREQ/CH control. Also, check if the receiver is detuned.
What to do if the Furuno Telephone antenna coupler can’t tune the antenna?
If the antenna coupler can't tune the antenna, check the antenna connection to ensure it is neither disconnected nor shorted. The recommended antenna length is 6 to 15 meters. Verify the coupler ground and check the connection cable.
What to do if Furuno FS-1503 key input is not accepted?
If key input is not accepted, it might be because the FS-1503 is under the control of external equipment. If "REM" appears, suspend operation of the external equipment.
Why frequency readout appears but no lamps light on Furuno Telephone?
If the frequency readout appears but no lamps light, the [ /9] key may be off. Try pressing the [ /9] key.
How to tune in a broadcast station on Furuno FS-1503?
To tune in a broadcast station, for example, 9640 kHz, press [RX], [9], [6], [4], [0], [0], [ENT]. Ensure you include the last [0]; otherwise, you will set 964.0 kHz. Also, select H3E for the mode. If the frequency is less than 1.6 MHz, ensure ANT FIL is set to 0.1 to 30 MHz (Set in PA/FIL).
Lists standard supply models and components for the FS-1503.
Details the optional supply items available for the FS-1503.
Introduces the FS-1503 as an upgraded model for boats and its specifications.
Illustrates the interconnection diagram of the FS-1503 system components.
Describes the function of each Printed Circuit Board (PCB) in the FS-1503.
Explains the frequency spectrum for different transmission and reception modes.
Details the CPU's general function, block diagram, and components.
Lists and describes the input/output control signals for the CPU.
Explains how the CPU controls transmitting/receiving circuits via serial and parallel data.
Explains frequency conversion and local oscillator frequencies.
Details the AF amplifier and 455 kHz circuit within the TX/RX section.
Describes the receiver circuit, including FIL (RX) and TX/RX sections.
Explains the power supply switch circuit included in the PA/FIL board.
Describes the SW REG board, its connections, and block diagram.
Details the AT-1503 antenna coupler's general function and block diagram.
Explains the antenna coupler's matching process using TUNE and BUSY signals.
Describes the L-type matching circuits used in the AT-1503 for impedance matching.
Explains the "through" signal's role in antenna coupler operation based on system setting 9921.
Describes the interface options for connecting DSC, NBDP, and remote stations.
Details the types of REMOTE boards (RS-232C and current loop) and their connections.
Explains how MIF commands from DP-6 control the FS-1503.
Describes the optional CONTROL board needed for the BK line.
Shows the front and rear panels of the FS-1503 main unit with labeled components.
Identifies major components on the TX/RX board, including VCO, DDS, and FAN.
Locates components on the PA/FIL and SW REG boards, including TX FIL circuits.
Identifies key components on the CPU board, such as EEROM, LCD CONT, and CPU.
Shows the main components of the AT-1503 antenna coupler, including CPU and TUNE switch.
Displays views of the PR-200 power supply unit, highlighting the fan and AVR adjustment.
Provides a step-by-step procedure for changing system settings via the unit's interface.
Lists and describes various system channels, including country, TX/RX settings, and squelch.
Explains how to program user channels, including scan groups and channel names.
Explains how to set output power data for HI, LOW, and TUNE modes.
Describes how to adjust jumper settings for the BC Band Filter to prevent interference.
Details the necessary settings on the DP-6 and FS-1503 for NBDP connection.
Outlines important periodic maintenance tasks for optimal performance.
Explains how to perform self-tests on the transceiver, LCD, and antenna coupler.
Describes how to check the LCD and keyboard functionality by pressing each key.
Details the procedure for checking the antenna coupler's relays and jumper settings.
Provides a guide to diagnose and resolve common symptoms and causes of issues.
Provides instructions for performing measurements, starting with frequency adjustment.
Details the procedure for adjusting the frequency, including required equipment and checks.
Explains how to measure and set the receiver gain for J3E mode.
Guides the user on adjusting the Automatic Gain Control (AGC) for J3E mode.
Details the procedure for measuring the total receive gain in J3E mode.
Refers to power data setting in Chapter 4 for adjusting TX output power.
Provides instructions for changing the PA transistor, including PA bias adjustment.
Lists various measurements and adjustments for different boards with settings and check points.
Shows the physical layout of components on the CPU board.
Displays the component layout for the TX/RX board.
Shows the component layout for the PA/FIL board.
Displays the component layout for the COUP board.
Shows component layouts for DUMMY CONT and SW REG boards.
Lists general specifications including communication system, frequency range, and resolution.
Details receiver specifications such as system, sensitivity, selectivity, and output.
Lists transmitter specifications including output impedance, power, and controls.
Outlines antenna coupler specifications like tuning system, frequency, and VSWR.
Refers to outline drawings for dimensions and mass information.
Provides specifications for power supply voltage and consumption during receive and transmit.
Lists environmental specifications for operating temperature and humidity.
Specifies the coating color for the transceiver unit and antenna coupler.
Provides a template for programming custom channels and frequencies.
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