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531440-1_B - HDR610 Manual_Eng.qxd
Maintenance
HDR 610 Maintenance .............................................................................................................. 28
Transducer Maintenance............................................................................................................ 28
HDR 610 Doesn't Power Up........................................................................................................ 29
No Bottom Reading on the Display .......................................................................................... 29
No Continuous Depth Display in Very Shallow Water.............................................................. 29
Screen Fades, Images are Not Sharp ........................................................................................ 29
Bottom Reading Disappears During a Hard Turn...................................................................... 29
Returning Your Unit for Service.................................................................................................. 31
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HOW SONAR WORKS
Sonar technology is based on sound waves. The HDR 610 Digital Depth Gauge uses sonar to
determine depth directly below the transducer. Your HDR 610 Digital Depth Gauge consists of two
components: the HDR 610 sonar unit and the transducer. The sonar unit contains the transmitter
and receiver, as well as the user controls and display. The transducer is mounted beneath the
water surface and converts electrical energy from the transmitter into mechanical pulses or sound
waves. The transducer also receives the reflected sound waves and converts them back into
electrical signals for display on the sonar unit.
Sonar is very fast. A sound wave can travel from the surface to a depth of 240 ft (70 m) and back
again in less than 1/4 of a second. It is unlikely that your boat can "outrun" this sonar signal.
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