Assessments - 3, GPA: 4.7
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Facilidade de uso
(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 necessary. Preamp unit Check for rust at junction between preamp unit and antenna. Remove rust. 2.2 Self Test This unit comes equipped with a self test facility which checks it for proper operation. Procedure 1. Turn on the power. (Scanning starts.) 2. Press the T£ST switch. (“TEST” LED lights.) If there is no problem the “frequency” LEDs light in order. 3. The self test stops automatically and scanning restarts. (“TEST” LED goes off. ) 4 \ I / ✓ - 2187.5 -' / r v 4207.5 6312 16804.5 REMOTE (Note 1P| For error, offending Lighting Lighting LightingLighting^—^LighHng All OFF J board or board.) Notel: The “REMOTE” LED blinks when there is no exchange of data between the AA-50 and DSC-5. (Cause: DSC-5 turned off, Remote-E setting of DSC-5 set to other than “WR”, or cable To restart scanning, press any key. connecting AA-50 to DSC-5 is disconnected.) To restart scanning, press any key. 5 3.1 Power Supply 3.1 Power Supply Then check... Remedy • breaker (2A) on rear panel. • power cable. • voltage (technicians only). • Push breaker in if it is protruding (ofQ, to restore normal operation. • Check for damage and proper seating. Measure voltage at power connector. (Rating: 10-40 VDC) • Measuring point: J45#l (+) - #2( - ) on POWER board (08P3135). If you cannot turn on the power... Rear Side Awarning Do not open the cover of the equipment. This equiment uses high voltage electricity which can shock, burn, or cause death Only eualified personnel should work inside the equipment. AA-50 Bottom View with Cover Removed 3.2 Receiver You can check for receiving line fault by doing the self test; frequency LED blinks to identify defective receiving line. Problem Check Cannot receive. • Input filter on RCVR board (05P0512) •OSC board (05P0513) Cannot scan correctly. •CONTROL board (05P0514) 6 FURUNO i ,_ display pcb FURUNO ELECTRIC CO.* LTD. FURUNO 1,2,3 Power Supply Block- [Incl. POWER PCB (08P3135)] FURUNO ELECTRIC CO. LTD. E5539A98 FURUNO APl-l SPECIFICATIONS OF AA-50 MF/HP DSC RECEIVER 1. Receiving System 2. Receiving Frequency 3. Class of Emission 4. Frequency Stability 5. Warm-up Time 6. Sensitivity 7. Selectivity 8. Line Output 9. Audio Output 10. Environmental Conditions Ambient Temperature Relative Humidity 11. Power Requirement PLL synthesized, single-conversion superheterodyne 2187.5 / 8414.5 kHz and 4207.5, 6312, 12577, 16804. 5 kHz FIB, J2B within ±10Hz 1 minute Error rate : less than 1/100 for lwV input -6dB : 270 to 300Hz -30dB : within ±380Hz ~60dB : within ±550Hz — 10dBm to +10dBm (600 ohms, balanced) 1W (8 ohms, unbalanced) -15^ to +55^ m (at +40*) 10 to 40VDC, 15W, or 100/110/115/220/230VAC, l
CD-players - DSC Receiver AA50 AA50R MF (402.85 kb)