installations do generate static electricity. High power radio transmitters can also have nuisance
effects.
V. H. F. Radios may also cause unit interference. A second depth sounder being operated
simultaneously to the chart will also cause interference. Turn all other depth sounders off while
operating the Chart Recorder.
Good grounding is a great help in reducing electrical noise. If you find you have a noise problem,
start linking all your items of electrical equipment to a central ground point such as the battery
terminal, with large gauge wire or braid (#6 or #8).
In the event that a particular interference problem cannot be corrected, it would be advisable to
contact a dealer or service center for assistance.
MAINTENANCE
A few simple maintenance steps can enhance the performance of your unit. While this piece of
equipment is designed to withstand a lot of physical abuse, it should still be treated as a delicate
instrument.
1. Keep your unit clean by wiping inside and out with a damp cloth.
2. Remove it from the boat when not in use. Store in a cool, dry place.
3. In extremely cold temperature it is suggested the unit be kept inside prior to its operation.
4. The transducer face should be kept clean free of buildup. Highway grime can coat t he face
while the boat is trailered. Briskly wipe the face with a damp cloth before launching the boat.
A light sanding with fine sandpaper prior to each use is also recommended.
5. Periodically inspect cables for nicks, cuts, or breaks. Such a nick can be repaired with
electrical tape.
6. Check connectors for corrosion, especially in salt water. A little baking soda and water on a
toothbrush will remove corrosive material.
7. Marine growth or buildup can be removed from the transducer face by scraping with a plastic
scraper. A light sanding is then suggested.
8. Keep grounding springs clean and free from carbon dust by wiping with a damp cloth.
9. Clean and sand stylus plate periodically to remove carbon and to prevent groove from
forming.
Summary of Contents for CH Thirty II
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