3.1 Periodic Maintenance Schedule
Interval | Check point | Check and measures | Remarks |
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Weekly | Display unit | Periodically clean the exterior of | CRT screen produces static charge |
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| display unit using dry soft clean. Use | which would attract dust. DO |
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| of commercially available CRT | NOT use strong solvent like paint |
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| cleaner (spray) having antistatic | thinner or abrasive cleaners for |
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| effect is recommended. | cleaning. |
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| Dust and dirt on CRT creates |
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| symptoms similar to poor |
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| sensitivity. |
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3 to 6 | Exposed nuts | Check for corroded or loosened nuts | Sealing compound may be used |
months | and bolts on | and bolts. If necessary, clean and | instead of paint. Apply a small |
| antenna unit | repaint them thickly. Replace them if | amount of grease between nuts |
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| heavily corroded. | and bolts for easy removal in |
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| future. |
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| Antenna | Check for dirt and cracks on radiator | Do not use plastic solvent |
| radiator | surface. Thick dirt should be wiped | (acetone) for cleaning. If you need |
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| off with soft cloth dampened with | to remove ice from antenna unit, |
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| fresh water. if a crack is found, apply | use a wooden hammer or plastic |
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| a slight amount of sealing compound | head hammer. Crack on the unit |
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| or adhesive as a temporary remedy, | may cause water ingress, causing |
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| then call for repair. | serious damages to internal |
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| circuits. |
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| Terminal strips | Open antenna cover to check | When closing antenna covers in |
| and plugs in | terminal strip and plug connections | position, be careful not to catch |
| antenna unit | inside. Also check the rubber gasket | loose wires between covers and |
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| of antenna covers for deterioration. | unit. |
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6 months | CRT and | High voltage at CRT and | If CRT anode rubber cap or wire |
to one | surrounding | surrounding components attract dust | sheath is cracked, ask your dealer |
year | components | in environment which will cause | to replace it. Wait for at least 3 |
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| poor insulation. Ask your nearest | minutes until high voltage |
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| FURUNO representative or dealer to | components (CRT and HV |
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| clean internal | capacitors) discharge their residual |
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| components. | charges before accessing them. |
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| Terminal | Check for loose connections. Check |
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| strips, sockets, | contacts and plugs for proper seating, |
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| earth terminal | etc. |
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3.2 Life Expectancy of Major Parts
Part | Type |
| Life expectancy | Remarks |
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Antenna | (24 rpm | Gears more than | Wind load | |
motor | (36 rpm) | 10,000 hours | 100 knots | |
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Magnetron | MG5232/E3560 (6 kW) |
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| MG5241/E3566 (10 kW) |
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| 9M752/M5187F (25 kW) |
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