Servicing A Thru-Hull Transducer; How To Contact Raymarine - Raymarine L750 Operating Handbook

Chapter 5: Maintenance and Troubleshooting
The speed or log readings are wrong –
1. The paddle wheel on the transducer may be fouled. Clean the parts
as described in the section on "Cleaning Instructions."
2. Check the speed calibration. Use the item for "Speed Cal" on the
System Setup display. See the instructions in Section 4.

Servicing a Thru-Hull Transducer

If your boat has a thru-hull transducer, you can service it without
removing the boat from the water. The sensor(s) are mounted in a
cylindrical plug in the center of the transducer assembly. If necessary,
you can remove this plug by working from the inside of the boat. The
transducer housing includes a check valve to minimize the water
intrusion when removing the insert. A small amount of water will enter
the boat. This is normal. Immediately after removing the speed insert,
place the dummy insert in the transducer housing. Do not leave the
transducer without the speed or dummy insert in place.

How to Contact Raymarine

For technical support
Please call 1-800-539-5539, extension 2444 or (603) 881-5200,
extension 2444. Our Fax number is 1-603-864-4756.
You may reach our Technical Service Department Monday through
Friday, 8:15 a.m. to 5:00 p.m. Eastern Standard Time or Eastern
Daylight Savings Time. Our Technical Support Specialists are available
to answer questions about installing, operating, and troubleshooting
your Raymarine unit. You may also reach our Technical Support
Department via the Internet. Questions may be addressed directly to:
techsupport@raymarine.com
Or, you may visit the Raymarine World Wide Web site :
www.raymarine.com
For accessories and parts
Please call 1-800-539-5539, extension 2333 or (603) 881-5200
extension 2333.
Many Raymarine accessory items and parts are available through your
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