Assessments - 4, GPA: 4.3
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No user-serviceable parts inside. A - - Name: Warning Label (1) Type : 86-003-1011-0 Code No. : 100-236-230 AA-50 MF/HF DSC RECEIVER 7 Photo No. 1244 AA-50R MF/HF DSC RECEIVER (Rack Mount) Page SAFETY INSTRUCTIONS i INTRODUCTION 1 1. OPERATION 2 1.1 Controls....................................................2 1.2 Basic Operating Procedure .................................3 1.3 Receiving ..................................................4 2. MAINTENANCE 5 2.1 Regular Checks ............................................5 2.2 Self Test ...................................................5 3. TROUBLESHOOTING (For qualified person) 6 3.1 Power Supply ..............................................6 3.2 Receiver ...................................................6 Specifications AP1-1 About the AA-50/50R About the AA-50/50R The FURUNO AA-50/50R MF/HF DSC Receivers receive DSC distress and safety frequencies (max. 6), and are mainly employed by vessels which operate in ocean areas A3 and A4. Example connections with various FURUNO communication equipment are shown in the figure below. The AA-50 and AA-50R are operationally identical, but the AA-50R is designed for rack mounting and its power switch is a toggle switch rather than pushbutton. /Receiving y general calls / \ Relay turns upward upon receiving distress/safety call. \ / OR 1 1.1 Controls 1.1 Controls (Provides four levels of illumination for display panel.) 2 1.2 Basic Operating Procedure 1.2 Basic Operating Procedure Procedure Key Operation I.Turn on the power. Press the |P0WER switch. -►- All LEDs light momentarily and (For AA-50R, flip the scanning starts automatically. (In power switch upward.) the factory setting, all six DSC distress/safety frequencies are scanned.) 2. Adjust illumination of display panel. Press the f@l key.-Four levels are available, in the following sequence. |—> HI —> MED —> LOW—> OFF-^j 3. Deselect frequency(s) from scanning. (Max. 3) (1) Press FI key to stop —►- Currently selected frequency LED scanning temporarily. blinks. (2) Select frequency you want to deselect with frequency key. Note that both 2 MHz and 8 MHz cannot be deselected. Example : Deselect 4 MHz Press 0 key-►- "4207.5” LED goes off. (3) Press j^j key to restart scanning. 4. Select a scanning frequency. (1) Press pA»i] to stop scanning. (2) Press a desired frequency key whose LED is off. (Example: 4 MHz -►Press p*"| key.) (3) Press 0 t0 restart scanning. 5. Adjust speaker volume. Adjust the VOLUME control for comfortable listening level. Turning it fully counterclockwise mutes receive signal. 6. Turn off the power. Press and hold down the w«*» switch about two seconds then release it. (For AA-50R, flip the POWER switch downward.) 3 1.3 Receiving 1.3 Receiving When a distress/safety call comes in; the receive signal sounds through the speaker • the DSC monitor lamp blinks • receiving frequency LED lights “REMOTE” LED lights momentarily. The receive signal is then sent to a DSC Terminal (DSC-5) for analysis. After the AA-50/50R completely receives the signal it restarts scanning. When own ship is in distress, the distress alert is transmitted by the DSC-5 or DMC-5. Then, the AA-50/50R deactivates receive function at the moment it receives the alert transmitted by own ship. (The “REMOTE” LED lights, indicating that the AA-50 is now controlled by the DSC-5.) This state continues about five minutes. To cancel it, turn the power off. Reference : How the AA-50/50R Works The AA-50/50R functions only to detect a receive signal which is prefixed with a “dot pattern” signal (200 bit H/L repetitive signal). Receive signal contents: DOT PATTERN MESSAGE * When it detects the dot pattern, an internal relay (shown below) turns upward to pass the signal to the DSC-5. Note that distress/safety calls take precedence over all other calls. When the AA-50 receives: # a distress alert from DSC-5 of own ship its keyboard locks and the ”REMOTE” LED lights five minutes. (After five minutes, AA-50 resumes scanning.) # a message other than distress (for example, safety) transmitted on a distress/safety frequency by DSC-5 its keyboard locks and the "REMOTE” LED lights one minute. # a distress from another ship it watches on the received frequency three minutes to receive distress acknowledgement (DIST ACK) from a coast station. 4 2.1 Regular Checks The AA-50 and AA-50R are designed to provide many years of trouble-free performance. However, no machine can perform its intended function unless properly maintained. 2.1 Regular Checks Main Unit The external surfaces of the main unit can be cleaned when necessary. The only recommended cleaning material is a soft cloth. Periodically check that all connectors on the rear panel and inside the main unit are firmly plugged in. Antenna Item Checkpoint Remedy Whip antenna 1. Check for cracks. 2. Check for water leakage. Replace if damaged. Wire antenna Check for damage. Tape where ne...
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